diff --git a/HISTORY.md b/HISTORY.md index 656792fb..dcfd1cfa 100755 --- a/HISTORY.md +++ b/HISTORY.md @@ -4,6 +4,7 @@ * **New Features:** * new SciSnap2 extension and library, thanks, Eckart! + * new MQTT extension and library, thanks, Simon and Xavier! * **Notable Changes:** * hyperized reporter-IF/ELSE * **Notable Fixes:** @@ -12,6 +13,9 @@ * **Documentation Updates:** * **Translation Updates:** +### 2022-02-18 +* new MQTT extension and library, thanks, Simon and Xavier! + ### 2022-02-17 * strings library: fixed lowercase(number), thanks, Brian and Simon! * new SciSnap2 extension and library, thanks, Eckart! diff --git a/libraries/LIBRARIES b/libraries/LIBRARIES index 6b8e777e..3535d64b 100644 --- a/libraries/LIBRARIES +++ b/libraries/LIBRARIES @@ -38,4 +38,5 @@ SciSnap!2Blocks.xml SciSnap! v2 Scientific Functions, Graphing, SQL interface, M ~ ~ ~ ~ serial_module.xml Serial Ports Connect to hardware extensions through the Web Serial API (Chromium, Chrome or Edge required) +mqtt.xml MQTT (Message Queuing Telemetry Transport) protocol for connecting with IOT devices signada.xml Signada (Network remote control) Interact with MicroBlocks devices via WiFi. Requires the device to have a TFT display, two buttons and WiFi capability, as well as the Signada MicroBlocks project loaded. The Citilab ED1 and a bunch of the M5Stack boards are some of the devices that work with Signada. diff --git a/libraries/mqtt.js b/libraries/mqtt.js new file mode 100644 index 00000000..0f38d3e4 --- /dev/null +++ b/libraries/mqtt.js @@ -0,0 +1,15239 @@ +(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.mqtt = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i + this.emit('error', new Error('Packet has no Authentication Method') + )) + return this + } + if (this.options.properties.authenticationMethod && this.options.authPacket && typeof this.options.authPacket === 'object') { + var authPacket = xtend({cmd: 'auth', reasonCode: 0}, this.options.authPacket) + sendPacket(this, authPacket) + } + } + + // many drain listeners are needed for qos 1 callbacks if the connection is intermittent + this.stream.setMaxListeners(1000) + + clearTimeout(this.connackTimer) + this.connackTimer = setTimeout(function () { + debug('!!connectTimeout hit!! Calling _cleanUp with force `true`') + that._cleanUp(true) + }, this.options.connectTimeout) +} + +MqttClient.prototype._handlePacket = function (packet, done) { + var options = this.options + + if (options.protocolVersion === 5 && options.properties && options.properties.maximumPacketSize && options.properties.maximumPacketSize < packet.length) { + this.emit('error', new Error('exceeding packets size ' + packet.cmd)) + this.end({reasonCode: 149, properties: { reasonString: 'Maximum packet size was exceeded' }}) + return this + } + debug('_handlePacket :: emitting packetreceive') + this.emit('packetreceive', packet) + + switch (packet.cmd) { + case 'publish': + this._handlePublish(packet, done) + break + case 'puback': + case 'pubrec': + case 'pubcomp': + case 'suback': + case 'unsuback': + this._handleAck(packet) + done() + break + case 'pubrel': + this._handlePubrel(packet, done) + break + case 'connack': + this._handleConnack(packet) + done() + break + case 'pingresp': + this._handlePingresp(packet) + done() + break + case 'disconnect': + this._handleDisconnect(packet) + done() + break + default: + // do nothing + // maybe we should do an error handling + // or just log it + break + } +} + +MqttClient.prototype._checkDisconnecting = function (callback) { + if (this.disconnecting) { + if (callback) { + callback(new Error('client disconnecting')) + } else { + this.emit('error', new Error('client disconnecting')) + } + } + return this.disconnecting +} + +/** + * publish - publish to + * + * @param {String} topic - topic to publish to + * @param {String, Buffer} message - message to publish + * @param {Object} [opts] - publish options, includes: + * {Number} qos - qos level to publish on + * {Boolean} retain - whether or not to retain the message + * {Boolean} dup - whether or not mark a message as duplicate + * {Function} cbStorePut - function(){} called when message is put into `outgoingStore` + * @param {Function} [callback] - function(err){} + * called when publish succeeds or fails + * @returns {MqttClient} this - for chaining + * @api public + * + * @example client.publish('topic', 'message'); + * @example + * client.publish('topic', 'message', {qos: 1, retain: true, dup: true}); + * @example client.publish('topic', 'message', console.log); + */ +MqttClient.prototype.publish = function (topic, message, opts, callback) { + debug('publish :: message `%s` to topic `%s`', message, topic) + var packet + var options = this.options + + // .publish(topic, payload, cb); + if (typeof opts === 'function') { + callback = opts + opts = null + } + + // default opts + var defaultOpts = {qos: 0, retain: false, dup: false} + opts = xtend(defaultOpts, opts) + + if (this._checkDisconnecting(callback)) { + return this + } + + packet = { + cmd: 'publish', + topic: topic, + payload: message, + qos: opts.qos, + retain: opts.retain, + messageId: this._nextId(), + dup: opts.dup + } + + if (options.protocolVersion === 5) { + packet.properties = opts.properties + if ((!options.properties && packet.properties && packet.properties.topicAlias) || ((opts.properties && options.properties) && + ((opts.properties.topicAlias && options.properties.topicAliasMaximum && opts.properties.topicAlias > options.properties.topicAliasMaximum) || + (!options.properties.topicAliasMaximum && opts.properties.topicAlias)))) { + /* + if we are don`t setup topic alias or + topic alias maximum less than topic alias or + server don`t give topic alias maximum, + we are removing topic alias from packet + */ + delete packet.properties.topicAlias + } + } + + debug('publish :: qos', opts.qos) + switch (opts.qos) { + case 1: + case 2: + // Add to callbacks + this.outgoing[packet.messageId] = { + volatile: false, + cb: callback || nop + } + if (this._storeProcessing) { + debug('_storeProcessing enabled') + this._packetIdsDuringStoreProcessing[packet.messageId] = false + this._storePacket(packet, undefined, opts.cbStorePut) + } else { + debug('MqttClient:publish: packet cmd: %s', packet.cmd) + this._sendPacket(packet, undefined, opts.cbStorePut) + } + break + default: + if (this._storeProcessing) { + debug('_storeProcessing enabled') + this._storePacket(packet, callback, opts.cbStorePut) + } else { + debug('MqttClient:publish: packet cmd: %s', packet.cmd) + this._sendPacket(packet, callback, opts.cbStorePut) + } + break + } + + return this +} + +/** + * subscribe - subscribe to + * + * @param {String, Array, Object} topic - topic(s) to subscribe to, supports objects in the form {'topic': qos} + * @param {Object} [opts] - optional subscription options, includes: + * {Number} qos - subscribe qos level + * @param {Function} [callback] - function(err, granted){} where: + * {Error} err - subscription error (none at the moment!) + * {Array} granted - array of {topic: 't', qos: 0} + * @returns {MqttClient} this - for chaining + * @api public + * @example client.subscribe('topic'); + * @example client.subscribe('topic', {qos: 1}); + * @example client.subscribe({'topic': {qos: 0}, 'topic2': {qos: 1}}, console.log); + * @example client.subscribe('topic', console.log); + */ +MqttClient.prototype.subscribe = function () { + var packet + var args = new Array(arguments.length) + for (var i = 0; i < arguments.length; i++) { + args[i] = arguments[i] + } + var subs = [] + var obj = args.shift() + var resubscribe = obj.resubscribe + var callback = args.pop() || nop + var opts = args.pop() + var invalidTopic + var that = this + var version = this.options.protocolVersion + + delete obj.resubscribe + + if (typeof obj === 'string') { + obj = [obj] + } + + if (typeof callback !== 'function') { + opts = callback + callback = nop + } + + invalidTopic = validations.validateTopics(obj) + if (invalidTopic !== null) { + setImmediate(callback, new Error('Invalid topic ' + invalidTopic)) + return this + } + + if (this._checkDisconnecting(callback)) { + debug('subscribe: discconecting true') + return this + } + + var defaultOpts = { + qos: 0 + } + if (version === 5) { + defaultOpts.nl = false + defaultOpts.rap = false + defaultOpts.rh = 0 + } + opts = xtend(defaultOpts, opts) + + if (Array.isArray(obj)) { + obj.forEach(function (topic) { + debug('subscribe: array topic %s', topic) + if (!that._resubscribeTopics.hasOwnProperty(topic) || + that._resubscribeTopics[topic].qos < opts.qos || + resubscribe) { + var currentOpts = { + topic: topic, + qos: opts.qos + } + if (version === 5) { + currentOpts.nl = opts.nl + currentOpts.rap = opts.rap + currentOpts.rh = opts.rh + currentOpts.properties = opts.properties + } + debug('subscribe: pushing topic `%s` and qos `%s` to subs list', currentOpts.topic, currentOpts.qos) + subs.push(currentOpts) + } + }) + } else { + Object + .keys(obj) + .forEach(function (k) { + debug('subscribe: object topic %s', k) + if (!that._resubscribeTopics.hasOwnProperty(k) || + that._resubscribeTopics[k].qos < obj[k].qos || + resubscribe) { + var currentOpts = { + topic: k, + qos: obj[k].qos + } + if (version === 5) { + currentOpts.nl = obj[k].nl + currentOpts.rap = obj[k].rap + currentOpts.rh = obj[k].rh + currentOpts.properties = opts.properties + } + debug('subscribe: pushing `%s` to subs list', currentOpts) + subs.push(currentOpts) + } + }) + } + + packet = { + cmd: 'subscribe', + subscriptions: subs, + qos: 1, + retain: false, + dup: false, + messageId: this._nextId() + } + + if (opts.properties) { + packet.properties = opts.properties + } + + if (!subs.length) { + callback(null, []) + return + } + + // subscriptions to resubscribe to in case of disconnect + if (this.options.resubscribe) { + debug('subscribe :: resubscribe true') + var topics = [] + subs.forEach(function (sub) { + if (that.options.reconnectPeriod > 0) { + var topic = { qos: sub.qos } + if (version === 5) { + topic.nl = sub.nl || false + topic.rap = sub.rap || false + topic.rh = sub.rh || 0 + topic.properties = sub.properties + } + that._resubscribeTopics[sub.topic] = topic + topics.push(sub.topic) + } + }) + that.messageIdToTopic[packet.messageId] = topics + } + + this.outgoing[packet.messageId] = { + volatile: true, + cb: function (err, packet) { + if (!err) { + var granted = packet.granted + for (var i = 0; i < granted.length; i += 1) { + subs[i].qos = granted[i] + } + } + + callback(err, subs) + } + } + debug('subscribe :: call _sendPacket') + this._sendPacket(packet) + + return this +} + +/** + * unsubscribe - unsubscribe from topic(s) + * + * @param {String, Array} topic - topics to unsubscribe from + * @param {Object} [opts] - optional subscription options, includes: + * {Object} properties - properties of unsubscribe packet + * @param {Function} [callback] - callback fired on unsuback + * @returns {MqttClient} this - for chaining + * @api public + * @example client.unsubscribe('topic'); + * @example client.unsubscribe('topic', console.log); + */ +MqttClient.prototype.unsubscribe = function () { + var packet = { + cmd: 'unsubscribe', + qos: 1, + messageId: this._nextId() + } + var that = this + var args = new Array(arguments.length) + for (var i = 0; i < arguments.length; i++) { + args[i] = arguments[i] + } + var topic = args.shift() + var callback = args.pop() || nop + var opts = args.pop() + + if (typeof topic === 'string') { + topic = [topic] + } + + if (typeof callback !== 'function') { + opts = callback + callback = nop + } + + if (this._checkDisconnecting(callback)) { + return this + } + + if (typeof topic === 'string') { + packet.unsubscriptions = [topic] + } else if (Array.isArray(topic)) { + packet.unsubscriptions = topic + } + + if (this.options.resubscribe) { + packet.unsubscriptions.forEach(function (topic) { + delete that._resubscribeTopics[topic] + }) + } + + if (typeof opts === 'object' && opts.properties) { + packet.properties = opts.properties + } + + this.outgoing[packet.messageId] = { + volatile: true, + cb: callback + } + + debug('unsubscribe: call _sendPacket') + this._sendPacket(packet) + + return this +} + +/** + * end - close connection + * + * @returns {MqttClient} this - for chaining + * @param {Boolean} force - do not wait for all in-flight messages to be acked + * @param {Object} opts - added to the disconnect packet + * @param {Function} cb - called when the client has been closed + * + * @api public + */ +MqttClient.prototype.end = function (force, opts, cb) { + var that = this + + debug('end :: (%s)', this.options.clientId) + + if (force == null || typeof force !== 'boolean') { + cb = opts || nop + opts = force + force = false + if (typeof opts !== 'object') { + cb = opts + opts = null + if (typeof cb !== 'function') { + cb = nop + } + } + } + + if (typeof opts !== 'object') { + cb = opts + opts = null + } + + debug('end :: cb? %s', !!cb) + cb = cb || nop + + function closeStores () { + debug('end :: closeStores: closing incoming and outgoing stores') + that.disconnected = true + that.incomingStore.close(function (e1) { + that.outgoingStore.close(function (e2) { + debug('end :: closeStores: emitting end') + that.emit('end') + if (cb) { + let err = e1 || e2 + debug('end :: closeStores: invoking callback with args') + cb(err) + } + }) + }) + if (that._deferredReconnect) { + that._deferredReconnect() + } + } + + function finish () { + // defer closesStores of an I/O cycle, + // just to make sure things are + // ok for websockets + debug('end :: (%s) :: finish :: calling _cleanUp with force %s', that.options.clientId, force) + that._cleanUp(force, () => { + debug('end :: finish :: calling process.nextTick on closeStores') + // var boundProcess = nextTick.bind(null, closeStores) + nextTick(closeStores.bind(that)) + }, opts) + } + + if (this.disconnecting) { + cb() + return this + } + + this._clearReconnect() + + this.disconnecting = true + + if (!force && Object.keys(this.outgoing).length > 0) { + // wait 10ms, just to be sure we received all of it + debug('end :: (%s) :: calling finish in 10ms once outgoing is empty', that.options.clientId) + this.once('outgoingEmpty', setTimeout.bind(null, finish, 10)) + } else { + debug('end :: (%s) :: immediately calling finish', that.options.clientId) + finish() + } + + return this +} + +/** + * removeOutgoingMessage - remove a message in outgoing store + * the outgoing callback will be called withe Error('Message removed') if the message is removed + * + * @param {Number} messageId - messageId to remove message + * @returns {MqttClient} this - for chaining + * @api public + * + * @example client.removeOutgoingMessage(client.getLastMessageId()); + */ +MqttClient.prototype.removeOutgoingMessage = function (messageId) { + var cb = this.outgoing[messageId] ? this.outgoing[messageId].cb : null + delete this.outgoing[messageId] + this.outgoingStore.del({messageId: messageId}, function () { + cb(new Error('Message removed')) + }) + return this +} + +/** + * reconnect - connect again using the same options as connect() + * + * @param {Object} [opts] - optional reconnect options, includes: + * {Store} incomingStore - a store for the incoming packets + * {Store} outgoingStore - a store for the outgoing packets + * if opts is not given, current stores are used + * @returns {MqttClient} this - for chaining + * + * @api public + */ +MqttClient.prototype.reconnect = function (opts) { + debug('client reconnect') + var that = this + var f = function () { + if (opts) { + that.options.incomingStore = opts.incomingStore + that.options.outgoingStore = opts.outgoingStore + } else { + that.options.incomingStore = null + that.options.outgoingStore = null + } + that.incomingStore = that.options.incomingStore || new Store() + that.outgoingStore = that.options.outgoingStore || new Store() + that.disconnecting = false + that.disconnected = false + that._deferredReconnect = null + that._reconnect() + } + + if (this.disconnecting && !this.disconnected) { + this._deferredReconnect = f + } else { + f() + } + return this +} + +/** + * _reconnect - implement reconnection + * @api privateish + */ +MqttClient.prototype._reconnect = function () { + debug('_reconnect: emitting reconnect to client') + this.emit('reconnect') + if (this.connected) { + this.end(() => { this._setupStream() }) + debug('client already connected. disconnecting first.') + } else { + debug('_reconnect: calling _setupStream') + this._setupStream() + } +} + +/** + * _setupReconnect - setup reconnect timer + */ +MqttClient.prototype._setupReconnect = function () { + var that = this + + if (!that.disconnecting && !that.reconnectTimer && (that.options.reconnectPeriod > 0)) { + if (!this.reconnecting) { + debug('_setupReconnect :: emit `offline` state') + this.emit('offline') + debug('_setupReconnect :: set `reconnecting` to `true`') + this.reconnecting = true + } + debug('_setupReconnect :: setting reconnectTimer for %d ms', that.options.reconnectPeriod) + that.reconnectTimer = setInterval(function () { + debug('reconnectTimer :: reconnect triggered!') + that._reconnect() + }, that.options.reconnectPeriod) + } else { + debug('_setupReconnect :: doing nothing...') + } +} + +/** + * _clearReconnect - clear the reconnect timer + */ +MqttClient.prototype._clearReconnect = function () { + debug('_clearReconnect : clearing reconnect timer') + if (this.reconnectTimer) { + clearInterval(this.reconnectTimer) + this.reconnectTimer = null + } +} + +/** + * _cleanUp - clean up on connection end + * @api private + */ +MqttClient.prototype._cleanUp = function (forced, done) { + var opts = arguments[2] + if (done) { + debug('_cleanUp :: done callback provided for on stream close') + this.stream.on('close', done) + } + + debug('_cleanUp :: forced? %s', forced) + if (forced) { + if ((this.options.reconnectPeriod === 0) && this.options.clean) { + flush(this.outgoing) + } + debug('_cleanUp :: (%s) :: destroying stream', this.options.clientId) + this.stream.destroy() + } else { + var packet = xtend({ cmd: 'disconnect' }, opts) + debug('_cleanUp :: (%s) :: call _sendPacket with disconnect packet', this.options.clientId) + this._sendPacket( + packet, + setImmediate.bind( + null, + this.stream.end.bind(this.stream) + ) + ) + } + + if (!this.disconnecting) { + debug('_cleanUp :: client not disconnecting. Clearing and resetting reconnect.') + this._clearReconnect() + this._setupReconnect() + } + + if (this.pingTimer !== null) { + debug('_cleanUp :: clearing pingTimer') + this.pingTimer.clear() + this.pingTimer = null + } + + if (done && !this.connected) { + debug('_cleanUp :: (%s) :: removing stream `done` callback `close` listener', this.options.clientId) + this.stream.removeListener('close', done) + done() + } +} + +/** + * _sendPacket - send or queue a packet + * @param {Object} packet - packet options + * @param {Function} cb - callback when the packet is sent + * @param {Function} cbStorePut - called when message is put into outgoingStore + * @api private + */ +MqttClient.prototype._sendPacket = function (packet, cb, cbStorePut) { + debug('_sendPacket :: (%s) :: start', this.options.clientId) + cbStorePut = cbStorePut || nop + + if (!this.connected) { + debug('_sendPacket :: client not connected. Storing packet offline.') + this._storePacket(packet, cb, cbStorePut) + return + } + + // When sending a packet, reschedule the ping timer + this._shiftPingInterval() + + switch (packet.cmd) { + case 'publish': + break + case 'pubrel': + storeAndSend(this, packet, cb, cbStorePut) + return + default: + sendPacket(this, packet, cb) + return + } + + switch (packet.qos) { + case 2: + case 1: + storeAndSend(this, packet, cb, cbStorePut) + break + /** + * no need of case here since it will be caught by default + * and jshint comply that before default it must be a break + * anyway it will result in -1 evaluation + */ + case 0: + /* falls through */ + default: + sendPacket(this, packet, cb) + break + } + debug('_sendPacket :: (%s) :: end', this.options.clientId) +} + +/** + * _storePacket - queue a packet + * @param {Object} packet - packet options + * @param {Function} cb - callback when the packet is sent + * @param {Function} cbStorePut - called when message is put into outgoingStore + * @api private + */ +MqttClient.prototype._storePacket = function (packet, cb, cbStorePut) { + debug('_storePacket :: packet: %o', packet) + debug('_storePacket :: cb? %s', !!cb) + cbStorePut = cbStorePut || nop + + // check that the packet is not a qos of 0, or that the command is not a publish + if (((packet.qos || 0) === 0 && this.queueQoSZero) || packet.cmd !== 'publish') { + this.queue.push({ packet: packet, cb: cb }) + } else if (packet.qos > 0) { + cb = this.outgoing[packet.messageId] ? this.outgoing[packet.messageId].cb : null + this.outgoingStore.put(packet, function (err) { + if (err) { + return cb && cb(err) + } + cbStorePut() + }) + } else if (cb) { + cb(new Error('No connection to broker')) + } +} + +/** + * _setupPingTimer - setup the ping timer + * + * @api private + */ +MqttClient.prototype._setupPingTimer = function () { + debug('_setupPingTimer :: keepalive %d (seconds)', this.options.keepalive) + var that = this + + if (!this.pingTimer && this.options.keepalive) { + this.pingResp = true + this.pingTimer = reInterval(function () { + that._checkPing() + }, this.options.keepalive * 1000) + } +} + +/** + * _shiftPingInterval - reschedule the ping interval + * + * @api private + */ +MqttClient.prototype._shiftPingInterval = function () { + if (this.pingTimer && this.options.keepalive && this.options.reschedulePings) { + this.pingTimer.reschedule(this.options.keepalive * 1000) + } +} +/** + * _checkPing - check if a pingresp has come back, and ping the server again + * + * @api private + */ +MqttClient.prototype._checkPing = function () { + debug('_checkPing :: checking ping...') + if (this.pingResp) { + debug('_checkPing :: ping response received. Clearing flag and sending `pingreq`') + this.pingResp = false + this._sendPacket({ cmd: 'pingreq' }) + } else { + // do a forced cleanup since socket will be in bad shape + debug('_checkPing :: calling _cleanUp with force true') + this._cleanUp(true) + } +} + +/** + * _handlePingresp - handle a pingresp + * + * @api private + */ +MqttClient.prototype._handlePingresp = function () { + this.pingResp = true +} + +/** + * _handleConnack + * + * @param {Object} packet + * @api private + */ +MqttClient.prototype._handleConnack = function (packet) { + debug('_handleConnack') + var options = this.options + var version = options.protocolVersion + var rc = version === 5 ? packet.reasonCode : packet.returnCode + + clearTimeout(this.connackTimer) + + if (packet.properties) { + if (packet.properties.topicAliasMaximum) { + if (!options.properties) { options.properties = {} } + options.properties.topicAliasMaximum = packet.properties.topicAliasMaximum + } + if (packet.properties.serverKeepAlive && options.keepalive) { + options.keepalive = packet.properties.serverKeepAlive + this._shiftPingInterval() + } + if (packet.properties.maximumPacketSize) { + if (!options.properties) { options.properties = {} } + options.properties.maximumPacketSize = packet.properties.maximumPacketSize + } + } + + if (rc === 0) { + this.reconnecting = false + this._onConnect(packet) + } else if (rc > 0) { + var err = new Error('Connection refused: ' + errors[rc]) + err.code = rc + this.emit('error', err) + } +} + +/** + * _handlePublish + * + * @param {Object} packet + * @api private + */ +/* +those late 2 case should be rewrite to comply with coding style: + +case 1: +case 0: + // do not wait sending a puback + // no callback passed + if (1 === qos) { + this._sendPacket({ + cmd: 'puback', + messageId: messageId + }); + } + // emit the message event for both qos 1 and 0 + this.emit('message', topic, message, packet); + this.handleMessage(packet, done); + break; +default: + // do nothing but every switch mus have a default + // log or throw an error about unknown qos + break; + +for now i just suppressed the warnings +*/ +MqttClient.prototype._handlePublish = function (packet, done) { + debug('_handlePublish: packet %o', packet) + done = typeof done !== 'undefined' ? done : nop + var topic = packet.topic.toString() + var message = packet.payload + var qos = packet.qos + var messageId = packet.messageId + var that = this + var options = this.options + var validReasonCodes = [0, 16, 128, 131, 135, 144, 145, 151, 153] + debug('_handlePublish: qos %d', qos) + switch (qos) { + case 2: { + options.customHandleAcks(topic, message, packet, function (error, code) { + if (!(error instanceof Error)) { + code = error + error = null + } + if (error) { return that.emit('error', error) } + if (validReasonCodes.indexOf(code) === -1) { return that.emit('error', new Error('Wrong reason code for pubrec')) } + if (code) { + that._sendPacket({cmd: 'pubrec', messageId: messageId, reasonCode: code}, done) + } else { + that.incomingStore.put(packet, function () { + that._sendPacket({cmd: 'pubrec', messageId: messageId}, done) + }) + } + }) + break + } + case 1: { + // emit the message event + options.customHandleAcks(topic, message, packet, function (error, code) { + if (!(error instanceof Error)) { + code = error + error = null + } + if (error) { return that.emit('error', error) } + if (validReasonCodes.indexOf(code) === -1) { return that.emit('error', new Error('Wrong reason code for puback')) } + if (!code) { that.emit('message', topic, message, packet) } + that.handleMessage(packet, function (err) { + if (err) { + return done && done(err) + } + that._sendPacket({cmd: 'puback', messageId: messageId, reasonCode: code}, done) + }) + }) + break + } + case 0: + // emit the message event + this.emit('message', topic, message, packet) + this.handleMessage(packet, done) + break + default: + // do nothing + debug('_handlePublish: unknown QoS. Doing nothing.') + // log or throw an error about unknown qos + break + } +} + +/** + * Handle messages with backpressure support, one at a time. + * Override at will. + * + * @param Packet packet the packet + * @param Function callback call when finished + * @api public + */ +MqttClient.prototype.handleMessage = function (packet, callback) { + callback() +} + +/** + * _handleAck + * + * @param {Object} packet + * @api private + */ + +MqttClient.prototype._handleAck = function (packet) { + /* eslint no-fallthrough: "off" */ + var messageId = packet.messageId + var type = packet.cmd + var response = null + var cb = this.outgoing[messageId] ? this.outgoing[messageId].cb : null + var that = this + var err + + if (!cb) { + debug('_handleAck :: Server sent an ack in error. Ignoring.') + // Server sent an ack in error, ignore it. + return + } + + // Process + debug('_handleAck :: packet type', type) + switch (type) { + case 'pubcomp': + // same thing as puback for QoS 2 + case 'puback': + var pubackRC = packet.reasonCode + // Callback - we're done + if (pubackRC && pubackRC > 0 && pubackRC !== 16) { + err = new Error('Publish error: ' + errors[pubackRC]) + err.code = pubackRC + cb(err, packet) + } + delete this.outgoing[messageId] + this.outgoingStore.del(packet, cb) + break + case 'pubrec': + response = { + cmd: 'pubrel', + qos: 2, + messageId: messageId + } + var pubrecRC = packet.reasonCode + + if (pubrecRC && pubrecRC > 0 && pubrecRC !== 16) { + err = new Error('Publish error: ' + errors[pubrecRC]) + err.code = pubrecRC + cb(err, packet) + } else { + this._sendPacket(response) + } + break + case 'suback': + delete this.outgoing[messageId] + for (var grantedI = 0; grantedI < packet.granted.length; grantedI++) { + if ((packet.granted[grantedI] & 0x80) !== 0) { + // suback with Failure status + var topics = this.messageIdToTopic[messageId] + if (topics) { + topics.forEach(function (topic) { + delete that._resubscribeTopics[topic] + }) + } + } + } + cb(null, packet) + break + case 'unsuback': + delete this.outgoing[messageId] + cb(null) + break + default: + that.emit('error', new Error('unrecognized packet type')) + } + + if (this.disconnecting && + Object.keys(this.outgoing).length === 0) { + this.emit('outgoingEmpty') + } +} + +/** + * _handlePubrel + * + * @param {Object} packet + * @api private + */ +MqttClient.prototype._handlePubrel = function (packet, callback) { + debug('handling pubrel packet') + callback = typeof callback !== 'undefined' ? callback : nop + var messageId = packet.messageId + var that = this + + var comp = {cmd: 'pubcomp', messageId: messageId} + + that.incomingStore.get(packet, function (err, pub) { + if (!err) { + that.emit('message', pub.topic, pub.payload, pub) + that.handleMessage(pub, function (err) { + if (err) { + return callback(err) + } + that.incomingStore.del(pub, nop) + that._sendPacket(comp, callback) + }) + } else { + that._sendPacket(comp, callback) + } + }) +} + +/** + * _handleDisconnect + * + * @param {Object} packet + * @api private + */ +MqttClient.prototype._handleDisconnect = function (packet) { + this.emit('disconnect', packet) +} + +/** + * _nextId + * @return unsigned int + */ +MqttClient.prototype._nextId = function () { + // id becomes current state of this.nextId and increments afterwards + var id = this.nextId++ + // Ensure 16 bit unsigned int (max 65535, nextId got one higher) + if (this.nextId === 65536) { + this.nextId = 1 + } + return id +} + +/** + * getLastMessageId + * @return unsigned int + */ +MqttClient.prototype.getLastMessageId = function () { + return (this.nextId === 1) ? 65535 : (this.nextId - 1) +} + +/** + * _resubscribe + * @api private + */ +MqttClient.prototype._resubscribe = function (connack) { + debug('_resubscribe') + var _resubscribeTopicsKeys = Object.keys(this._resubscribeTopics) + if (!this._firstConnection && + (this.options.clean || (this.options.protocolVersion === 5 && !connack.sessionPresent)) && + _resubscribeTopicsKeys.length > 0) { + if (this.options.resubscribe) { + if (this.options.protocolVersion === 5) { + debug('_resubscribe: protocolVersion 5') + for (var topicI = 0; topicI < _resubscribeTopicsKeys.length; topicI++) { + var resubscribeTopic = {} + resubscribeTopic[_resubscribeTopicsKeys[topicI]] = this._resubscribeTopics[_resubscribeTopicsKeys[topicI]] + resubscribeTopic.resubscribe = true + this.subscribe(resubscribeTopic, {properties: resubscribeTopic[_resubscribeTopicsKeys[topicI]].properties}) + } + } else { + this._resubscribeTopics.resubscribe = true + this.subscribe(this._resubscribeTopics) + } + } else { + this._resubscribeTopics = {} + } + } + + this._firstConnection = false +} + +/** + * _onConnect + * + * @api private + */ +MqttClient.prototype._onConnect = function (packet) { + if (this.disconnected) { + this.emit('connect', packet) + return + } + + var that = this + + this._setupPingTimer() + this._resubscribe(packet) + + this.connected = true + + function startStreamProcess () { + var outStore = that.outgoingStore.createStream() + + function clearStoreProcessing () { + that._storeProcessing = false + that._packetIdsDuringStoreProcessing = {} + } + + that.once('close', remove) + outStore.on('error', function (err) { + clearStoreProcessing() + that.removeListener('close', remove) + that.emit('error', err) + }) + + function remove () { + outStore.destroy() + outStore = null + clearStoreProcessing() + } + + function storeDeliver () { + // edge case, we wrapped this twice + if (!outStore) { + return + } + that._storeProcessing = true + + var packet = outStore.read(1) + + var cb + + if (!packet) { + // read when data is available in the future + outStore.once('readable', storeDeliver) + return + } + + // Skip already processed store packets + if (that._packetIdsDuringStoreProcessing[packet.messageId]) { + storeDeliver() + return + } + + // Avoid unnecessary stream read operations when disconnected + if (!that.disconnecting && !that.reconnectTimer) { + cb = that.outgoing[packet.messageId] ? that.outgoing[packet.messageId].cb : null + that.outgoing[packet.messageId] = { + volatile: false, + cb: function (err, status) { + // Ensure that the original callback passed in to publish gets invoked + if (cb) { + cb(err, status) + } + + storeDeliver() + } + } + that._packetIdsDuringStoreProcessing[packet.messageId] = true + that._sendPacket(packet) + } else if (outStore.destroy) { + outStore.destroy() + } + } + + outStore.on('end', function () { + var allProcessed = true + for (var id in that._packetIdsDuringStoreProcessing) { + if (!that._packetIdsDuringStoreProcessing[id]) { + allProcessed = false + break + } + } + if (allProcessed) { + clearStoreProcessing() + that.removeListener('close', remove) + that.emit('connect', packet) + } else { + startStreamProcess() + } + }) + storeDeliver() + } + // start flowing + startStreamProcess() +} + +module.exports = MqttClient + +}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}) +},{"./store":7,"./validations":8,"_process":44,"debug":14,"events":27,"inherits":29,"mqtt-packet":34,"readable-stream":59,"reinterval":60,"xtend":68}],2:[function(require,module,exports){ +(function (Buffer){ +'use strict' + +var Transform = require('readable-stream').Transform +var duplexify = require('duplexify') + +/* global FileReader */ +var my +var proxy +var stream +var isInitialized = false + +function buildProxy () { + var proxy = new Transform() + proxy._write = function (chunk, encoding, next) { + my.sendSocketMessage({ + data: chunk.buffer, + success: function () { + next() + }, + fail: function () { + next(new Error()) + } + }) + } + proxy._flush = function socketEnd (done) { + my.closeSocket({ + success: function () { + done() + } + }) + } + + return proxy +} + +function setDefaultOpts (opts) { + if (!opts.hostname) { + opts.hostname = 'localhost' + } + if (!opts.path) { + opts.path = '/' + } + + if (!opts.wsOptions) { + opts.wsOptions = {} + } +} + +function buildUrl (opts, client) { + var protocol = opts.protocol === 'alis' ? 'wss' : 'ws' + var url = protocol + '://' + opts.hostname + opts.path + if (opts.port && opts.port !== 80 && opts.port !== 443) { + url = protocol + '://' + opts.hostname + ':' + opts.port + opts.path + } + if (typeof (opts.transformWsUrl) === 'function') { + url = opts.transformWsUrl(url, opts, client) + } + return url +} + +function bindEventHandler () { + if (isInitialized) return + + isInitialized = true + + my.onSocketOpen(function () { + stream.setReadable(proxy) + stream.setWritable(proxy) + stream.emit('connect') + }) + + my.onSocketMessage(function (res) { + if (typeof res.data === 'string') { + var buffer = Buffer.from(res.data, 'base64') + proxy.push(buffer) + } else { + var reader = new FileReader() + reader.addEventListener('load', function () { + var data = reader.result + + if (data instanceof ArrayBuffer) data = Buffer.from(data) + else data = Buffer.from(data, 'utf8') + proxy.push(data) + }) + reader.readAsArrayBuffer(res.data) + } + }) + + my.onSocketClose(function () { + stream.end() + stream.destroy() + }) + + my.onSocketError(function (res) { + stream.destroy(res) + }) +} + +function buildStream (client, opts) { + opts.hostname = opts.hostname || opts.host + + if (!opts.hostname) { + throw new Error('Could not determine host. Specify host manually.') + } + + var websocketSubProtocol = + (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3) + ? 'mqttv3.1' + : 'mqtt' + + setDefaultOpts(opts) + + var url = buildUrl(opts, client) + my = opts.my + my.connectSocket({ + url: url, + protocols: websocketSubProtocol + }) + + proxy = buildProxy() + stream = duplexify.obj() + + bindEventHandler() + + return stream +} + +module.exports = buildStream + +}).call(this,require("buffer").Buffer) +},{"buffer":12,"duplexify":16,"readable-stream":59}],3:[function(require,module,exports){ +'use strict' +var net = require('net') +var debug = require('debug')('mqttjs:tcp') + +/* + variables port and host can be removed since + you have all required information in opts object +*/ +function streamBuilder (client, opts) { + var port, host + opts.port = opts.port || 1883 + opts.hostname = opts.hostname || opts.host || 'localhost' + + port = opts.port + host = opts.hostname + + debug('port %d and host %s', port, host) + return net.createConnection(port, host) +} + +module.exports = streamBuilder + +},{"debug":14,"net":11}],4:[function(require,module,exports){ +'use strict' +var tls = require('tls') +var debug = require('debug')('mqttjs:tls') + +function buildBuilder (mqttClient, opts) { + var connection + opts.port = opts.port || 8883 + opts.host = opts.hostname || opts.host || 'localhost' + opts.servername = opts.host + + opts.rejectUnauthorized = opts.rejectUnauthorized !== false + + delete opts.path + + debug('port %d host %s rejectUnauthorized %b', opts.port, opts.host, opts.rejectUnauthorized) + + connection = tls.connect(opts) + /* eslint no-use-before-define: [2, "nofunc"] */ + connection.on('secureConnect', function () { + if (opts.rejectUnauthorized && !connection.authorized) { + connection.emit('error', new Error('TLS not authorized')) + } else { + connection.removeListener('error', handleTLSerrors) + } + }) + + function handleTLSerrors (err) { + // How can I get verify this error is a tls error? + if (opts.rejectUnauthorized) { + mqttClient.emit('error', err) + } + + // close this connection to match the behaviour of net + // otherwise all we get is an error from the connection + // and close event doesn't fire. This is a work around + // to enable the reconnect code to work the same as with + // net.createConnection + connection.end() + } + + connection.on('error', handleTLSerrors) + return connection +} + +module.exports = buildBuilder + +},{"debug":14,"tls":11}],5:[function(require,module,exports){ +(function (process,Buffer){ +'use strict' + +const WS = require('ws') +const debug = require('debug')('mqttjs:ws') +const duplexify = require('duplexify') +const Transform = require('readable-stream').Transform + +let WSS_OPTIONS = [ + 'rejectUnauthorized', + 'ca', + 'cert', + 'key', + 'pfx', + 'passphrase' +] +// eslint-disable-next-line camelcase +const IS_BROWSER = (typeof process !== 'undefined' && process.title === 'browser') || typeof __webpack_require__ === 'function' +function buildUrl (opts, client) { + let url = opts.protocol + '://' + opts.hostname + ':' + opts.port + opts.path + if (typeof (opts.transformWsUrl) === 'function') { + url = opts.transformWsUrl(url, opts, client) + } + return url +} + +function setDefaultOpts (opts) { + let options = opts + if (!opts.hostname) { + options.hostname = 'localhost' + } + if (!opts.port) { + if (opts.protocol === 'wss') { + options.port = 443 + } else { + options.port = 80 + } + } + if (!opts.path) { + options.path = '/' + } + + if (!opts.wsOptions) { + options.wsOptions = {} + } + if (!IS_BROWSER && opts.protocol === 'wss') { + // Add cert/key/ca etc options + WSS_OPTIONS.forEach(function (prop) { + if (opts.hasOwnProperty(prop) && !opts.wsOptions.hasOwnProperty(prop)) { + options.wsOptions[prop] = opts[prop] + } + }) + } + + return options +} + +function setDefaultBrowserOpts (opts) { + let options = setDefaultOpts(opts) + + if (!options.hostname) { + options.hostname = options.host + } + + if (!options.hostname) { + // Throwing an error in a Web Worker if no `hostname` is given, because we + // can not determine the `hostname` automatically. If connecting to + // localhost, please supply the `hostname` as an argument. + if (typeof (document) === 'undefined') { + throw new Error('Could not determine host. Specify host manually.') + } + const parsed = new URL(document.URL) + options.hostname = parsed.hostname + + if (!options.port) { + options.port = parsed.port + } + } + + // objectMode should be defined for logic + if (options.objectMode === undefined) { + options.objectMode = !(options.binary === true || options.binary === undefined) + } + + return options +} + +function createWebSocket (client, url, opts) { + debug('createWebSocket') + debug('protocol: ' + opts.protocolId + ' ' + opts.protocolVersion) + const websocketSubProtocol = + (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3) + ? 'mqttv3.1' + : 'mqtt' + + debug('creating new Websocket for url: ' + url + ' and protocol: ' + websocketSubProtocol) + let socket = new WS(url, [websocketSubProtocol], opts.wsOptions) + return socket +} + +function createBrowserWebSocket (client, opts) { + const websocketSubProtocol = + (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3) + ? 'mqttv3.1' + : 'mqtt' + + let url = buildUrl(opts, client) + /* global WebSocket */ + let socket = new WebSocket(url, [websocketSubProtocol]) + socket.binaryType = 'arraybuffer' + return socket +} + +function streamBuilder (client, opts) { + debug('streamBuilder') + let options = setDefaultOpts(opts) + const url = buildUrl(options, client) + let socket = createWebSocket(client, url, options) + let webSocketStream = WS.createWebSocketStream(socket, options.wsOptions) + webSocketStream.url = url + return webSocketStream +} + +function browserStreamBuilder (client, opts) { + debug('browserStreamBuilder') + let stream + let options = setDefaultBrowserOpts(opts) + // sets the maximum socket buffer size before throttling + const bufferSize = options.browserBufferSize || 1024 * 512 + + const bufferTimeout = opts.browserBufferTimeout || 1000 + + const coerceToBuffer = !opts.objectMode + + let socket = createBrowserWebSocket(client, opts) + + let proxy = buildProxy(opts, socketWriteBrowser, socketEndBrowser) + + if (!opts.objectMode) { + proxy._writev = writev + } + proxy.on('close', () => { socket.close() }) + + const eventListenerSupport = (typeof socket.addEventListener === 'undefined') + + // was already open when passed in + if (socket.readyState === socket.OPEN) { + stream = proxy + } else { + stream = stream = duplexify(undefined, undefined, opts) + if (!opts.objectMode) { + stream._writev = writev + } + + if (eventListenerSupport) { + socket.addEventListener('open', onopen) + } else { + socket.onopen = onopen + } + } + + stream.socket = socket + + if (eventListenerSupport) { + socket.addEventListener('close', onclose) + socket.addEventListener('error', onerror) + socket.addEventListener('message', onmessage) + } else { + socket.onclose = onclose + socket.onerror = onerror + socket.onmessage = onmessage + } + + // methods for browserStreamBuilder + + function buildProxy (options, socketWrite, socketEnd) { + let proxy = new Transform({ + objectModeMode: options.objectMode + }) + + proxy._write = socketWrite + proxy._flush = socketEnd + + return proxy + } + + function onopen () { + stream.setReadable(proxy) + stream.setWritable(proxy) + stream.emit('connect') + } + + function onclose () { + stream.end() + stream.destroy() + } + + function onerror (err) { + stream.destroy(err) + } + + function onmessage (event) { + let data = event.data + if (data instanceof ArrayBuffer) data = Buffer.from(data) + else data = Buffer.from(data, 'utf8') + proxy.push(data) + } + + // this is to be enabled only if objectMode is false + function writev (chunks, cb) { + const buffers = new Array(chunks.length) + for (let i = 0; i < chunks.length; i++) { + if (typeof chunks[i].chunk === 'string') { + buffers[i] = Buffer.from(chunks[i], 'utf8') + } else { + buffers[i] = chunks[i].chunk + } + } + + this._write(Buffer.concat(buffers), 'binary', cb) + } + + function socketWriteBrowser (chunk, enc, next) { + if (socket.bufferedAmount > bufferSize) { + // throttle data until buffered amount is reduced. + setTimeout(socketWriteBrowser, bufferTimeout, chunk, enc, next) + } + + if (coerceToBuffer && typeof chunk === 'string') { + chunk = Buffer.from(chunk, 'utf8') + } + + try { + socket.send(chunk) + } catch (err) { + return next(err) + } + + next() + } + + function socketEndBrowser (done) { + socket.close() + done() + } + + // end methods for browserStreamBuilder + + return stream +} + +if (IS_BROWSER) { + module.exports = browserStreamBuilder +} else { + module.exports = streamBuilder +} + +}).call(this,require('_process'),require("buffer").Buffer) +},{"_process":44,"buffer":12,"debug":14,"duplexify":16,"readable-stream":59,"ws":67}],6:[function(require,module,exports){ +(function (Buffer){ +'use strict' + +var Transform = require('readable-stream').Transform +var duplexify = require('duplexify') + +/* global wx */ +var socketTask +var proxy +var stream + +function buildProxy () { + var proxy = new Transform() + proxy._write = function (chunk, encoding, next) { + socketTask.send({ + data: chunk.buffer, + success: function () { + next() + }, + fail: function (errMsg) { + next(new Error(errMsg)) + } + }) + } + proxy._flush = function socketEnd (done) { + socketTask.close({ + success: function () { + done() + } + }) + } + + return proxy +} + +function setDefaultOpts (opts) { + if (!opts.hostname) { + opts.hostname = 'localhost' + } + if (!opts.path) { + opts.path = '/' + } + + if (!opts.wsOptions) { + opts.wsOptions = {} + } +} + +function buildUrl (opts, client) { + var protocol = opts.protocol === 'wxs' ? 'wss' : 'ws' + var url = protocol + '://' + opts.hostname + opts.path + if (opts.port && opts.port !== 80 && opts.port !== 443) { + url = protocol + '://' + opts.hostname + ':' + opts.port + opts.path + } + if (typeof (opts.transformWsUrl) === 'function') { + url = opts.transformWsUrl(url, opts, client) + } + return url +} + +function bindEventHandler () { + socketTask.onOpen(function () { + stream.setReadable(proxy) + stream.setWritable(proxy) + stream.emit('connect') + }) + + socketTask.onMessage(function (res) { + var data = res.data + + if (data instanceof ArrayBuffer) data = Buffer.from(data) + else data = Buffer.from(data, 'utf8') + proxy.push(data) + }) + + socketTask.onClose(function () { + stream.end() + stream.destroy() + }) + + socketTask.onError(function (res) { + stream.destroy(new Error(res.errMsg)) + }) +} + +function buildStream (client, opts) { + opts.hostname = opts.hostname || opts.host + + if (!opts.hostname) { + throw new Error('Could not determine host. Specify host manually.') + } + + var websocketSubProtocol = + (opts.protocolId === 'MQIsdp') && (opts.protocolVersion === 3) + ? 'mqttv3.1' + : 'mqtt' + + setDefaultOpts(opts) + + var url = buildUrl(opts, client) + socketTask = wx.connectSocket({ + url: url, + protocols: [websocketSubProtocol] + }) + + proxy = buildProxy() + stream = duplexify.obj() + stream._destroy = function (err, cb) { + socketTask.close({ + success: function () { + cb && cb(err) + } + }) + } + + var destroyRef = stream.destroy + stream.destroy = function () { + stream.destroy = destroyRef + + var self = this + setTimeout(function () { + socketTask.close({ + fail: function () { + self._destroy(new Error()) + } + }) + }, 0) + }.bind(stream) + + bindEventHandler() + + return stream +} + +module.exports = buildStream + +}).call(this,require("buffer").Buffer) +},{"buffer":12,"duplexify":16,"readable-stream":59}],7:[function(require,module,exports){ +'use strict' + +/** + * Module dependencies + */ +var xtend = require('xtend') + +var Readable = require('readable-stream').Readable +var streamsOpts = { objectMode: true } +var defaultStoreOptions = { + clean: true +} + +/** + * In-memory implementation of the message store + * This can actually be saved into files. + * + * @param {Object} [options] - store options + */ +function Store (options) { + if (!(this instanceof Store)) { + return new Store(options) + } + + this.options = options || {} + + // Defaults + this.options = xtend(defaultStoreOptions, options) + + this._inflights = new Map() +} + +/** + * Adds a packet to the store, a packet is + * anything that has a messageId property. + * + */ +Store.prototype.put = function (packet, cb) { + this._inflights.set(packet.messageId, packet) + + if (cb) { + cb() + } + + return this +} + +/** + * Creates a stream with all the packets in the store + * + */ +Store.prototype.createStream = function () { + var stream = new Readable(streamsOpts) + var destroyed = false + var values = [] + var i = 0 + + this._inflights.forEach(function (value, key) { + values.push(value) + }) + + stream._read = function () { + if (!destroyed && i < values.length) { + this.push(values[i++]) + } else { + this.push(null) + } + } + + stream.destroy = function () { + if (destroyed) { + return + } + + var self = this + + destroyed = true + + setTimeout(function () { + self.emit('close') + }, 0) + } + + return stream +} + +/** + * deletes a packet from the store. + */ +Store.prototype.del = function (packet, cb) { + packet = this._inflights.get(packet.messageId) + if (packet) { + this._inflights.delete(packet.messageId) + cb(null, packet) + } else if (cb) { + cb(new Error('missing packet')) + } + + return this +} + +/** + * get a packet from the store. + */ +Store.prototype.get = function (packet, cb) { + packet = this._inflights.get(packet.messageId) + if (packet) { + cb(null, packet) + } else if (cb) { + cb(new Error('missing packet')) + } + + return this +} + +/** + * Close the store + */ +Store.prototype.close = function (cb) { + if (this.options.clean) { + this._inflights = null + } + if (cb) { + cb() + } +} + +module.exports = Store + +},{"readable-stream":59,"xtend":68}],8:[function(require,module,exports){ +'use strict' + +/** + * Validate a topic to see if it's valid or not. + * A topic is valid if it follow below rules: + * - Rule #1: If any part of the topic is not `+` or `#`, then it must not contain `+` and '#' + * - Rule #2: Part `#` must be located at the end of the mailbox + * + * @param {String} topic - A topic + * @returns {Boolean} If the topic is valid, returns true. Otherwise, returns false. + */ +function validateTopic (topic) { + var parts = topic.split('/') + + for (var i = 0; i < parts.length; i++) { + if (parts[i] === '+') { + continue + } + + if (parts[i] === '#') { + // for Rule #2 + return i === parts.length - 1 + } + + if (parts[i].indexOf('+') !== -1 || parts[i].indexOf('#') !== -1) { + return false + } + } + + return true +} + +/** + * Validate an array of topics to see if any of them is valid or not + * @param {Array} topics - Array of topics + * @returns {String} If the topics is valid, returns null. Otherwise, returns the invalid one + */ +function validateTopics (topics) { + if (topics.length === 0) { + return 'empty_topic_list' + } + for (var i = 0; i < topics.length; i++) { + if (!validateTopic(topics[i])) { + return topics[i] + } + } + return null +} + +module.exports = { + validateTopics: validateTopics +} + +},{}],9:[function(require,module,exports){ +(function (process){ +'use strict' + +var MqttClient = require('../client') +var Store = require('../store') +var debug = require('debug')('mqttjs') + +var protocols = {} + +// eslint-disable-next-line camelcase +if ((typeof process !== 'undefined' && process.title !== 'browser') || typeof __webpack_require__ !== 'function') { + protocols.mqtt = require('./tcp') + protocols.tcp = require('./tcp') + protocols.ssl = require('./tls') + protocols.tls = require('./tls') + protocols.mqtts = require('./tls') +} else { + protocols.wx = require('./wx') + protocols.wxs = require('./wx') + + protocols.ali = require('./ali') + protocols.alis = require('./ali') +} + +protocols.ws = require('./ws') +protocols.wss = require('./ws') + +/** + * Parse the auth attribute and merge username and password in the options object. + * + * @param {Object} [opts] option object + */ +function parseAuthOptions (opts) { + var matches + if (opts.auth) { + matches = opts.auth.match(/^(.+):(.+)$/) + if (matches) { + opts.username = matches[1] + opts.password = matches[2] + } else { + opts.username = opts.auth + } + } +} + +/** + * connect - connect to an MQTT broker. + * + * @param {String} [brokerUrl] - url of the broker, optional + * @param {Object} opts - see MqttClient#constructor + */ +function connect (brokerUrl, opts) { + debug('connecting to an MQTT broker...') + if ((typeof brokerUrl === 'object') && !opts) { + opts = brokerUrl + brokerUrl = null + } + + opts = opts || {} + + if (brokerUrl) { + if (opts.protocol === null) { + throw new Error('Missing protocol') + } + var parsed = new URL(brokerUrl) + + // the URL object is a bit special, so copy individual + // items to the opts object + opts.hash = parsed.hash + opts.host = parsed.host + opts.hostname = parsed.hostname + opts.href = parsed.href + opts.origin = parsed.origin + opts.pathname = parsed.pathname + opts.port = Number(parsed.port) || null + opts.protocol = parsed.protocol + opts.username = opts.username || parsed.username || null + opts.password = opts.password || parsed.password || null + opts.search = parsed.search + opts.searchParams = parsed.searchParams + opts.path = parsed.pathname + parsed.search + opts.protocol = opts.protocol.replace(/:$/, '') + } + + // merge in the auth options if supplied + // legacy support for url.parse objects (now deprecated in node.js) + parseAuthOptions(opts) + + // support clientId passed in the query string of the url + if (opts.searchParams && typeof opts.searchParams.get('clientId') === 'string') { + opts.clientId = opts.searchParams.get('clientId') + } + + // legacy support for url.parse objects (now deprecated in node.js) + if (opts.query && typeof opts.query.clientId === 'string') { + opts.clientId = opts.query.clientId + } + + if (opts.cert && opts.key) { + if (opts.protocol) { + if (['mqtts', 'wss', 'wxs', 'alis'].indexOf(opts.protocol) === -1) { + switch (opts.protocol) { + case 'mqtt': + opts.protocol = 'mqtts' + break + case 'ws': + opts.protocol = 'wss' + break + case 'wx': + opts.protocol = 'wxs' + break + case 'ali': + opts.protocol = 'alis' + break + default: + throw new Error('Unknown protocol for secure connection: "' + opts.protocol + '"!') + } + } + } else { + // A cert and key was provided, however no protocol was specified, so we will throw an error. + throw new Error('Missing secure protocol key') + } + } + + if (!protocols[opts.protocol]) { + var isSecure = ['mqtts', 'wss'].indexOf(opts.protocol) !== -1 + opts.protocol = [ + 'mqtt', + 'mqtts', + 'ws', + 'wss', + 'wx', + 'wxs', + 'ali', + 'alis' + ].filter(function (key, index) { + if (isSecure && index % 2 === 0) { + // Skip insecure protocols when requesting a secure one. + return false + } + return (typeof protocols[key] === 'function') + })[0] + } + + if (opts.clean === false && !opts.clientId) { + throw new Error('Missing clientId for unclean clients') + } + + if (opts.protocol) { + opts.defaultProtocol = opts.protocol + } + + function wrapper (client) { + if (opts.servers) { + if (!client._reconnectCount || client._reconnectCount === opts.servers.length) { + client._reconnectCount = 0 + } + + opts.host = opts.servers[client._reconnectCount].host + opts.port = opts.servers[client._reconnectCount].port + opts.protocol = (!opts.servers[client._reconnectCount].protocol ? opts.defaultProtocol : opts.servers[client._reconnectCount].protocol) + opts.hostname = opts.host + + client._reconnectCount++ + } + + debug('calling streambuilder for', opts.protocol) + return protocols[opts.protocol](client, opts) + } + var client = new MqttClient(wrapper, opts) + client.on('error', function () { /* Automatically set up client error handling */ }) + return client +} + +module.exports = connect +module.exports.connect = connect +module.exports.MqttClient = MqttClient +module.exports.Store = Store + +}).call(this,require('_process')) +},{"../client":1,"../store":7,"./ali":2,"./tcp":3,"./tls":4,"./ws":5,"./wx":6,"_process":44,"debug":14}],10:[function(require,module,exports){ +'use strict' + +exports.byteLength = byteLength +exports.toByteArray = toByteArray +exports.fromByteArray = fromByteArray + +var lookup = [] +var revLookup = [] +var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array + +var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/' +for (var i = 0, len = code.length; i < len; ++i) { + lookup[i] = code[i] + revLookup[code.charCodeAt(i)] = i +} + +// Support decoding URL-safe base64 strings, as Node.js does. +// See: https://en.wikipedia.org/wiki/Base64#URL_applications +revLookup['-'.charCodeAt(0)] = 62 +revLookup['_'.charCodeAt(0)] = 63 + +function getLens (b64) { + var len = b64.length + + if (len % 4 > 0) { + throw new Error('Invalid string. Length must be a multiple of 4') + } + + // Trim off extra bytes after placeholder bytes are found + // See: https://github.com/beatgammit/base64-js/issues/42 + var validLen = b64.indexOf('=') + if (validLen === -1) validLen = len + + var placeHoldersLen = validLen === len + ? 0 + : 4 - (validLen % 4) + + return [validLen, placeHoldersLen] +} + +// base64 is 4/3 + up to two characters of the original data +function byteLength (b64) { + var lens = getLens(b64) + var validLen = lens[0] + var placeHoldersLen = lens[1] + return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen +} + +function _byteLength (b64, validLen, placeHoldersLen) { + return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen +} + +function toByteArray (b64) { + var tmp + var lens = getLens(b64) + var validLen = lens[0] + var placeHoldersLen = lens[1] + + var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen)) + + var curByte = 0 + + // if there are placeholders, only get up to the last complete 4 chars + var len = placeHoldersLen > 0 + ? validLen - 4 + : validLen + + var i + for (i = 0; i < len; i += 4) { + tmp = + (revLookup[b64.charCodeAt(i)] << 18) | + (revLookup[b64.charCodeAt(i + 1)] << 12) | + (revLookup[b64.charCodeAt(i + 2)] << 6) | + revLookup[b64.charCodeAt(i + 3)] + arr[curByte++] = (tmp >> 16) & 0xFF + arr[curByte++] = (tmp >> 8) & 0xFF + arr[curByte++] = tmp & 0xFF + } + + if (placeHoldersLen === 2) { + tmp = + (revLookup[b64.charCodeAt(i)] << 2) | + (revLookup[b64.charCodeAt(i + 1)] >> 4) + arr[curByte++] = tmp & 0xFF + } + + if (placeHoldersLen === 1) { + tmp = + (revLookup[b64.charCodeAt(i)] << 10) | + (revLookup[b64.charCodeAt(i + 1)] << 4) | + (revLookup[b64.charCodeAt(i + 2)] >> 2) + arr[curByte++] = (tmp >> 8) & 0xFF + arr[curByte++] = tmp & 0xFF + } + + return arr +} + +function tripletToBase64 (num) { + return lookup[num >> 18 & 0x3F] + + lookup[num >> 12 & 0x3F] + + lookup[num >> 6 & 0x3F] + + lookup[num & 0x3F] +} + +function encodeChunk (uint8, start, end) { + var tmp + var output = [] + for (var i = start; i < end; i += 3) { + tmp = + ((uint8[i] << 16) & 0xFF0000) + + ((uint8[i + 1] << 8) & 0xFF00) + + (uint8[i + 2] & 0xFF) + output.push(tripletToBase64(tmp)) + } + return output.join('') +} + +function fromByteArray (uint8) { + var tmp + var len = uint8.length + var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes + var parts = [] + var maxChunkLength = 16383 // must be multiple of 3 + + // go through the array every three bytes, we'll deal with trailing stuff later + for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) { + parts.push(encodeChunk( + uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength) + )) + } + + // pad the end with zeros, but make sure to not forget the extra bytes + if (extraBytes === 1) { + tmp = uint8[len - 1] + parts.push( + lookup[tmp >> 2] + + lookup[(tmp << 4) & 0x3F] + + '==' + ) + } else if (extraBytes === 2) { + tmp = (uint8[len - 2] << 8) + uint8[len - 1] + parts.push( + lookup[tmp >> 10] + + lookup[(tmp >> 4) & 0x3F] + + lookup[(tmp << 2) & 0x3F] + + '=' + ) + } + + return parts.join('') +} + +},{}],11:[function(require,module,exports){ + +},{}],12:[function(require,module,exports){ +(function (Buffer){ +/*! + * The buffer module from node.js, for the browser. + * + * @author Feross Aboukhadijeh + * @license MIT + */ +/* eslint-disable no-proto */ + +'use strict' + +var base64 = require('base64-js') +var ieee754 = require('ieee754') + +exports.Buffer = Buffer +exports.SlowBuffer = SlowBuffer +exports.INSPECT_MAX_BYTES = 50 + +var K_MAX_LENGTH = 0x7fffffff +exports.kMaxLength = K_MAX_LENGTH + +/** + * If `Buffer.TYPED_ARRAY_SUPPORT`: + * === true Use Uint8Array implementation (fastest) + * === false Print warning and recommend using `buffer` v4.x which has an Object + * implementation (most compatible, even IE6) + * + * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+, + * Opera 11.6+, iOS 4.2+. + * + * We report that the browser does not support typed arrays if the are not subclassable + * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array` + * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support + * for __proto__ and has a buggy typed array implementation. + */ +Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport() + +if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' && + typeof console.error === 'function') { + console.error( + 'This browser lacks typed array (Uint8Array) support which is required by ' + + '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.' + ) +} + +function typedArraySupport () { + // Can typed array instances can be augmented? + try { + var arr = new Uint8Array(1) + arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } } + return arr.foo() === 42 + } catch (e) { + return false + } +} + +Object.defineProperty(Buffer.prototype, 'parent', { + enumerable: true, + get: function () { + if (!Buffer.isBuffer(this)) return undefined + return this.buffer + } +}) + +Object.defineProperty(Buffer.prototype, 'offset', { + enumerable: true, + get: function () { + if (!Buffer.isBuffer(this)) return undefined + return this.byteOffset + } +}) + +function createBuffer (length) { + if (length > K_MAX_LENGTH) { + throw new RangeError('The value "' + length + '" is invalid for option "size"') + } + // Return an augmented `Uint8Array` instance + var buf = new Uint8Array(length) + buf.__proto__ = Buffer.prototype + return buf +} + +/** + * The Buffer constructor returns instances of `Uint8Array` that have their + * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of + * `Uint8Array`, so the returned instances will have all the node `Buffer` methods + * and the `Uint8Array` methods. Square bracket notation works as expected -- it + * returns a single octet. + * + * The `Uint8Array` prototype remains unmodified. + */ + +function Buffer (arg, encodingOrOffset, length) { + // Common case. + if (typeof arg === 'number') { + if (typeof encodingOrOffset === 'string') { + throw new TypeError( + 'The "string" argument must be of type string. Received type number' + ) + } + return allocUnsafe(arg) + } + return from(arg, encodingOrOffset, length) +} + +// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97 +if (typeof Symbol !== 'undefined' && Symbol.species != null && + Buffer[Symbol.species] === Buffer) { + Object.defineProperty(Buffer, Symbol.species, { + value: null, + configurable: true, + enumerable: false, + writable: false + }) +} + +Buffer.poolSize = 8192 // not used by this implementation + +function from (value, encodingOrOffset, length) { + if (typeof value === 'string') { + return fromString(value, encodingOrOffset) + } + + if (ArrayBuffer.isView(value)) { + return fromArrayLike(value) + } + + if (value == null) { + throw TypeError( + 'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' + + 'or Array-like Object. Received type ' + (typeof value) + ) + } + + if (isInstance(value, ArrayBuffer) || + (value && isInstance(value.buffer, ArrayBuffer))) { + return fromArrayBuffer(value, encodingOrOffset, length) + } + + if (typeof value === 'number') { + throw new TypeError( + 'The "value" argument must not be of type number. Received type number' + ) + } + + var valueOf = value.valueOf && value.valueOf() + if (valueOf != null && valueOf !== value) { + return Buffer.from(valueOf, encodingOrOffset, length) + } + + var b = fromObject(value) + if (b) return b + + if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null && + typeof value[Symbol.toPrimitive] === 'function') { + return Buffer.from( + value[Symbol.toPrimitive]('string'), encodingOrOffset, length + ) + } + + throw new TypeError( + 'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' + + 'or Array-like Object. Received type ' + (typeof value) + ) +} + +/** + * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError + * if value is a number. + * Buffer.from(str[, encoding]) + * Buffer.from(array) + * Buffer.from(buffer) + * Buffer.from(arrayBuffer[, byteOffset[, length]]) + **/ +Buffer.from = function (value, encodingOrOffset, length) { + return from(value, encodingOrOffset, length) +} + +// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug: +// https://github.com/feross/buffer/pull/148 +Buffer.prototype.__proto__ = Uint8Array.prototype +Buffer.__proto__ = Uint8Array + +function assertSize (size) { + if (typeof size !== 'number') { + throw new TypeError('"size" argument must be of type number') + } else if (size < 0) { + throw new RangeError('The value "' + size + '" is invalid for option "size"') + } +} + +function alloc (size, fill, encoding) { + assertSize(size) + if (size <= 0) { + return createBuffer(size) + } + if (fill !== undefined) { + // Only pay attention to encoding if it's a string. This + // prevents accidentally sending in a number that would + // be interpretted as a start offset. + return typeof encoding === 'string' + ? createBuffer(size).fill(fill, encoding) + : createBuffer(size).fill(fill) + } + return createBuffer(size) +} + +/** + * Creates a new filled Buffer instance. + * alloc(size[, fill[, encoding]]) + **/ +Buffer.alloc = function (size, fill, encoding) { + return alloc(size, fill, encoding) +} + +function allocUnsafe (size) { + assertSize(size) + return createBuffer(size < 0 ? 0 : checked(size) | 0) +} + +/** + * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance. + * */ +Buffer.allocUnsafe = function (size) { + return allocUnsafe(size) +} +/** + * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance. + */ +Buffer.allocUnsafeSlow = function (size) { + return allocUnsafe(size) +} + +function fromString (string, encoding) { + if (typeof encoding !== 'string' || encoding === '') { + encoding = 'utf8' + } + + if (!Buffer.isEncoding(encoding)) { + throw new TypeError('Unknown encoding: ' + encoding) + } + + var length = byteLength(string, encoding) | 0 + var buf = createBuffer(length) + + var actual = buf.write(string, encoding) + + if (actual !== length) { + // Writing a hex string, for example, that contains invalid characters will + // cause everything after the first invalid character to be ignored. (e.g. + // 'abxxcd' will be treated as 'ab') + buf = buf.slice(0, actual) + } + + return buf +} + +function fromArrayLike (array) { + var length = array.length < 0 ? 0 : checked(array.length) | 0 + var buf = createBuffer(length) + for (var i = 0; i < length; i += 1) { + buf[i] = array[i] & 255 + } + return buf +} + +function fromArrayBuffer (array, byteOffset, length) { + if (byteOffset < 0 || array.byteLength < byteOffset) { + throw new RangeError('"offset" is outside of buffer bounds') + } + + if (array.byteLength < byteOffset + (length || 0)) { + throw new RangeError('"length" is outside of buffer bounds') + } + + var buf + if (byteOffset === undefined && length === undefined) { + buf = new Uint8Array(array) + } else if (length === undefined) { + buf = new Uint8Array(array, byteOffset) + } else { + buf = new Uint8Array(array, byteOffset, length) + } + + // Return an augmented `Uint8Array` instance + buf.__proto__ = Buffer.prototype + return buf +} + +function fromObject (obj) { + if (Buffer.isBuffer(obj)) { + var len = checked(obj.length) | 0 + var buf = createBuffer(len) + + if (buf.length === 0) { + return buf + } + + obj.copy(buf, 0, 0, len) + return buf + } + + if (obj.length !== undefined) { + if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) { + return createBuffer(0) + } + return fromArrayLike(obj) + } + + if (obj.type === 'Buffer' && Array.isArray(obj.data)) { + return fromArrayLike(obj.data) + } +} + +function checked (length) { + // Note: cannot use `length < K_MAX_LENGTH` here because that fails when + // length is NaN (which is otherwise coerced to zero.) + if (length >= K_MAX_LENGTH) { + throw new RangeError('Attempt to allocate Buffer larger than maximum ' + + 'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes') + } + return length | 0 +} + +function SlowBuffer (length) { + if (+length != length) { // eslint-disable-line eqeqeq + length = 0 + } + return Buffer.alloc(+length) +} + +Buffer.isBuffer = function isBuffer (b) { + return b != null && b._isBuffer === true && + b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false +} + +Buffer.compare = function compare (a, b) { + if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength) + if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength) + if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) { + throw new TypeError( + 'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array' + ) + } + + if (a === b) return 0 + + var x = a.length + var y = b.length + + for (var i = 0, len = Math.min(x, y); i < len; ++i) { + if (a[i] !== b[i]) { + x = a[i] + y = b[i] + break + } + } + + if (x < y) return -1 + if (y < x) return 1 + return 0 +} + +Buffer.isEncoding = function isEncoding (encoding) { + switch (String(encoding).toLowerCase()) { + case 'hex': + case 'utf8': + case 'utf-8': + case 'ascii': + case 'latin1': + case 'binary': + case 'base64': + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return true + default: + return false + } +} + +Buffer.concat = function concat (list, length) { + if (!Array.isArray(list)) { + throw new TypeError('"list" argument must be an Array of Buffers') + } + + if (list.length === 0) { + return Buffer.alloc(0) + } + + var i + if (length === undefined) { + length = 0 + for (i = 0; i < list.length; ++i) { + length += list[i].length + } + } + + var buffer = Buffer.allocUnsafe(length) + var pos = 0 + for (i = 0; i < list.length; ++i) { + var buf = list[i] + if (isInstance(buf, Uint8Array)) { + buf = Buffer.from(buf) + } + if (!Buffer.isBuffer(buf)) { + throw new TypeError('"list" argument must be an Array of Buffers') + } + buf.copy(buffer, pos) + pos += buf.length + } + return buffer +} + +function byteLength (string, encoding) { + if (Buffer.isBuffer(string)) { + return string.length + } + if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) { + return string.byteLength + } + if (typeof string !== 'string') { + throw new TypeError( + 'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' + + 'Received type ' + typeof string + ) + } + + var len = string.length + var mustMatch = (arguments.length > 2 && arguments[2] === true) + if (!mustMatch && len === 0) return 0 + + // Use a for loop to avoid recursion + var loweredCase = false + for (;;) { + switch (encoding) { + case 'ascii': + case 'latin1': + case 'binary': + return len + case 'utf8': + case 'utf-8': + return utf8ToBytes(string).length + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return len * 2 + case 'hex': + return len >>> 1 + case 'base64': + return base64ToBytes(string).length + default: + if (loweredCase) { + return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8 + } + encoding = ('' + encoding).toLowerCase() + loweredCase = true + } + } +} +Buffer.byteLength = byteLength + +function slowToString (encoding, start, end) { + var loweredCase = false + + // No need to verify that "this.length <= MAX_UINT32" since it's a read-only + // property of a typed array. + + // This behaves neither like String nor Uint8Array in that we set start/end + // to their upper/lower bounds if the value passed is out of range. + // undefined is handled specially as per ECMA-262 6th Edition, + // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization. + if (start === undefined || start < 0) { + start = 0 + } + // Return early if start > this.length. Done here to prevent potential uint32 + // coercion fail below. + if (start > this.length) { + return '' + } + + if (end === undefined || end > this.length) { + end = this.length + } + + if (end <= 0) { + return '' + } + + // Force coersion to uint32. This will also coerce falsey/NaN values to 0. + end >>>= 0 + start >>>= 0 + + if (end <= start) { + return '' + } + + if (!encoding) encoding = 'utf8' + + while (true) { + switch (encoding) { + case 'hex': + return hexSlice(this, start, end) + + case 'utf8': + case 'utf-8': + return utf8Slice(this, start, end) + + case 'ascii': + return asciiSlice(this, start, end) + + case 'latin1': + case 'binary': + return latin1Slice(this, start, end) + + case 'base64': + return base64Slice(this, start, end) + + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return utf16leSlice(this, start, end) + + default: + if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) + encoding = (encoding + '').toLowerCase() + loweredCase = true + } + } +} + +// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package) +// to detect a Buffer instance. It's not possible to use `instanceof Buffer` +// reliably in a browserify context because there could be multiple different +// copies of the 'buffer' package in use. This method works even for Buffer +// instances that were created from another copy of the `buffer` package. +// See: https://github.com/feross/buffer/issues/154 +Buffer.prototype._isBuffer = true + +function swap (b, n, m) { + var i = b[n] + b[n] = b[m] + b[m] = i +} + +Buffer.prototype.swap16 = function swap16 () { + var len = this.length + if (len % 2 !== 0) { + throw new RangeError('Buffer size must be a multiple of 16-bits') + } + for (var i = 0; i < len; i += 2) { + swap(this, i, i + 1) + } + return this +} + +Buffer.prototype.swap32 = function swap32 () { + var len = this.length + if (len % 4 !== 0) { + throw new RangeError('Buffer size must be a multiple of 32-bits') + } + for (var i = 0; i < len; i += 4) { + swap(this, i, i + 3) + swap(this, i + 1, i + 2) + } + return this +} + +Buffer.prototype.swap64 = function swap64 () { + var len = this.length + if (len % 8 !== 0) { + throw new RangeError('Buffer size must be a multiple of 64-bits') + } + for (var i = 0; i < len; i += 8) { + swap(this, i, i + 7) + swap(this, i + 1, i + 6) + swap(this, i + 2, i + 5) + swap(this, i + 3, i + 4) + } + return this +} + +Buffer.prototype.toString = function toString () { + var length = this.length + if (length === 0) return '' + if (arguments.length === 0) return utf8Slice(this, 0, length) + return slowToString.apply(this, arguments) +} + +Buffer.prototype.toLocaleString = Buffer.prototype.toString + +Buffer.prototype.equals = function equals (b) { + if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer') + if (this === b) return true + return Buffer.compare(this, b) === 0 +} + +Buffer.prototype.inspect = function inspect () { + var str = '' + var max = exports.INSPECT_MAX_BYTES + str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim() + if (this.length > max) str += ' ... ' + return '' +} + +Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) { + if (isInstance(target, Uint8Array)) { + target = Buffer.from(target, target.offset, target.byteLength) + } + if (!Buffer.isBuffer(target)) { + throw new TypeError( + 'The "target" argument must be one of type Buffer or Uint8Array. ' + + 'Received type ' + (typeof target) + ) + } + + if (start === undefined) { + start = 0 + } + if (end === undefined) { + end = target ? target.length : 0 + } + if (thisStart === undefined) { + thisStart = 0 + } + if (thisEnd === undefined) { + thisEnd = this.length + } + + if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) { + throw new RangeError('out of range index') + } + + if (thisStart >= thisEnd && start >= end) { + return 0 + } + if (thisStart >= thisEnd) { + return -1 + } + if (start >= end) { + return 1 + } + + start >>>= 0 + end >>>= 0 + thisStart >>>= 0 + thisEnd >>>= 0 + + if (this === target) return 0 + + var x = thisEnd - thisStart + var y = end - start + var len = Math.min(x, y) + + var thisCopy = this.slice(thisStart, thisEnd) + var targetCopy = target.slice(start, end) + + for (var i = 0; i < len; ++i) { + if (thisCopy[i] !== targetCopy[i]) { + x = thisCopy[i] + y = targetCopy[i] + break + } + } + + if (x < y) return -1 + if (y < x) return 1 + return 0 +} + +// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`, +// OR the last index of `val` in `buffer` at offset <= `byteOffset`. +// +// Arguments: +// - buffer - a Buffer to search +// - val - a string, Buffer, or number +// - byteOffset - an index into `buffer`; will be clamped to an int32 +// - encoding - an optional encoding, relevant is val is a string +// - dir - true for indexOf, false for lastIndexOf +function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) { + // Empty buffer means no match + if (buffer.length === 0) return -1 + + // Normalize byteOffset + if (typeof byteOffset === 'string') { + encoding = byteOffset + byteOffset = 0 + } else if (byteOffset > 0x7fffffff) { + byteOffset = 0x7fffffff + } else if (byteOffset < -0x80000000) { + byteOffset = -0x80000000 + } + byteOffset = +byteOffset // Coerce to Number. + if (numberIsNaN(byteOffset)) { + // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer + byteOffset = dir ? 0 : (buffer.length - 1) + } + + // Normalize byteOffset: negative offsets start from the end of the buffer + if (byteOffset < 0) byteOffset = buffer.length + byteOffset + if (byteOffset >= buffer.length) { + if (dir) return -1 + else byteOffset = buffer.length - 1 + } else if (byteOffset < 0) { + if (dir) byteOffset = 0 + else return -1 + } + + // Normalize val + if (typeof val === 'string') { + val = Buffer.from(val, encoding) + } + + // Finally, search either indexOf (if dir is true) or lastIndexOf + if (Buffer.isBuffer(val)) { + // Special case: looking for empty string/buffer always fails + if (val.length === 0) { + return -1 + } + return arrayIndexOf(buffer, val, byteOffset, encoding, dir) + } else if (typeof val === 'number') { + val = val & 0xFF // Search for a byte value [0-255] + if (typeof Uint8Array.prototype.indexOf === 'function') { + if (dir) { + return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset) + } else { + return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset) + } + } + return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir) + } + + throw new TypeError('val must be string, number or Buffer') +} + +function arrayIndexOf (arr, val, byteOffset, encoding, dir) { + var indexSize = 1 + var arrLength = arr.length + var valLength = val.length + + if (encoding !== undefined) { + encoding = String(encoding).toLowerCase() + if (encoding === 'ucs2' || encoding === 'ucs-2' || + encoding === 'utf16le' || encoding === 'utf-16le') { + if (arr.length < 2 || val.length < 2) { + return -1 + } + indexSize = 2 + arrLength /= 2 + valLength /= 2 + byteOffset /= 2 + } + } + + function read (buf, i) { + if (indexSize === 1) { + return buf[i] + } else { + return buf.readUInt16BE(i * indexSize) + } + } + + var i + if (dir) { + var foundIndex = -1 + for (i = byteOffset; i < arrLength; i++) { + if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) { + if (foundIndex === -1) foundIndex = i + if (i - foundIndex + 1 === valLength) return foundIndex * indexSize + } else { + if (foundIndex !== -1) i -= i - foundIndex + foundIndex = -1 + } + } + } else { + if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength + for (i = byteOffset; i >= 0; i--) { + var found = true + for (var j = 0; j < valLength; j++) { + if (read(arr, i + j) !== read(val, j)) { + found = false + break + } + } + if (found) return i + } + } + + return -1 +} + +Buffer.prototype.includes = function includes (val, byteOffset, encoding) { + return this.indexOf(val, byteOffset, encoding) !== -1 +} + +Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) { + return bidirectionalIndexOf(this, val, byteOffset, encoding, true) +} + +Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) { + return bidirectionalIndexOf(this, val, byteOffset, encoding, false) +} + +function hexWrite (buf, string, offset, length) { + offset = Number(offset) || 0 + var remaining = buf.length - offset + if (!length) { + length = remaining + } else { + length = Number(length) + if (length > remaining) { + length = remaining + } + } + + var strLen = string.length + + if (length > strLen / 2) { + length = strLen / 2 + } + for (var i = 0; i < length; ++i) { + var parsed = parseInt(string.substr(i * 2, 2), 16) + if (numberIsNaN(parsed)) return i + buf[offset + i] = parsed + } + return i +} + +function utf8Write (buf, string, offset, length) { + return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length) +} + +function asciiWrite (buf, string, offset, length) { + return blitBuffer(asciiToBytes(string), buf, offset, length) +} + +function latin1Write (buf, string, offset, length) { + return asciiWrite(buf, string, offset, length) +} + +function base64Write (buf, string, offset, length) { + return blitBuffer(base64ToBytes(string), buf, offset, length) +} + +function ucs2Write (buf, string, offset, length) { + return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length) +} + +Buffer.prototype.write = function write (string, offset, length, encoding) { + // Buffer#write(string) + if (offset === undefined) { + encoding = 'utf8' + length = this.length + offset = 0 + // Buffer#write(string, encoding) + } else if (length === undefined && typeof offset === 'string') { + encoding = offset + length = this.length + offset = 0 + // Buffer#write(string, offset[, length][, encoding]) + } else if (isFinite(offset)) { + offset = offset >>> 0 + if (isFinite(length)) { + length = length >>> 0 + if (encoding === undefined) encoding = 'utf8' + } else { + encoding = length + length = undefined + } + } else { + throw new Error( + 'Buffer.write(string, encoding, offset[, length]) is no longer supported' + ) + } + + var remaining = this.length - offset + if (length === undefined || length > remaining) length = remaining + + if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) { + throw new RangeError('Attempt to write outside buffer bounds') + } + + if (!encoding) encoding = 'utf8' + + var loweredCase = false + for (;;) { + switch (encoding) { + case 'hex': + return hexWrite(this, string, offset, length) + + case 'utf8': + case 'utf-8': + return utf8Write(this, string, offset, length) + + case 'ascii': + return asciiWrite(this, string, offset, length) + + case 'latin1': + case 'binary': + return latin1Write(this, string, offset, length) + + case 'base64': + // Warning: maxLength not taken into account in base64Write + return base64Write(this, string, offset, length) + + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return ucs2Write(this, string, offset, length) + + default: + if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding) + encoding = ('' + encoding).toLowerCase() + loweredCase = true + } + } +} + +Buffer.prototype.toJSON = function toJSON () { + return { + type: 'Buffer', + data: Array.prototype.slice.call(this._arr || this, 0) + } +} + +function base64Slice (buf, start, end) { + if (start === 0 && end === buf.length) { + return base64.fromByteArray(buf) + } else { + return base64.fromByteArray(buf.slice(start, end)) + } +} + +function utf8Slice (buf, start, end) { + end = Math.min(buf.length, end) + var res = [] + + var i = start + while (i < end) { + var firstByte = buf[i] + var codePoint = null + var bytesPerSequence = (firstByte > 0xEF) ? 4 + : (firstByte > 0xDF) ? 3 + : (firstByte > 0xBF) ? 2 + : 1 + + if (i + bytesPerSequence <= end) { + var secondByte, thirdByte, fourthByte, tempCodePoint + + switch (bytesPerSequence) { + case 1: + if (firstByte < 0x80) { + codePoint = firstByte + } + break + case 2: + secondByte = buf[i + 1] + if ((secondByte & 0xC0) === 0x80) { + tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F) + if (tempCodePoint > 0x7F) { + codePoint = tempCodePoint + } + } + break + case 3: + secondByte = buf[i + 1] + thirdByte = buf[i + 2] + if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) { + tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F) + if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) { + codePoint = tempCodePoint + } + } + break + case 4: + secondByte = buf[i + 1] + thirdByte = buf[i + 2] + fourthByte = buf[i + 3] + if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) { + tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F) + if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) { + codePoint = tempCodePoint + } + } + } + } + + if (codePoint === null) { + // we did not generate a valid codePoint so insert a + // replacement char (U+FFFD) and advance only 1 byte + codePoint = 0xFFFD + bytesPerSequence = 1 + } else if (codePoint > 0xFFFF) { + // encode to utf16 (surrogate pair dance) + codePoint -= 0x10000 + res.push(codePoint >>> 10 & 0x3FF | 0xD800) + codePoint = 0xDC00 | codePoint & 0x3FF + } + + res.push(codePoint) + i += bytesPerSequence + } + + return decodeCodePointsArray(res) +} + +// Based on http://stackoverflow.com/a/22747272/680742, the browser with +// the lowest limit is Chrome, with 0x10000 args. +// We go 1 magnitude less, for safety +var MAX_ARGUMENTS_LENGTH = 0x1000 + +function decodeCodePointsArray (codePoints) { + var len = codePoints.length + if (len <= MAX_ARGUMENTS_LENGTH) { + return String.fromCharCode.apply(String, codePoints) // avoid extra slice() + } + + // Decode in chunks to avoid "call stack size exceeded". + var res = '' + var i = 0 + while (i < len) { + res += String.fromCharCode.apply( + String, + codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH) + ) + } + return res +} + +function asciiSlice (buf, start, end) { + var ret = '' + end = Math.min(buf.length, end) + + for (var i = start; i < end; ++i) { + ret += String.fromCharCode(buf[i] & 0x7F) + } + return ret +} + +function latin1Slice (buf, start, end) { + var ret = '' + end = Math.min(buf.length, end) + + for (var i = start; i < end; ++i) { + ret += String.fromCharCode(buf[i]) + } + return ret +} + +function hexSlice (buf, start, end) { + var len = buf.length + + if (!start || start < 0) start = 0 + if (!end || end < 0 || end > len) end = len + + var out = '' + for (var i = start; i < end; ++i) { + out += toHex(buf[i]) + } + return out +} + +function utf16leSlice (buf, start, end) { + var bytes = buf.slice(start, end) + var res = '' + for (var i = 0; i < bytes.length; i += 2) { + res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256)) + } + return res +} + +Buffer.prototype.slice = function slice (start, end) { + var len = this.length + start = ~~start + end = end === undefined ? len : ~~end + + if (start < 0) { + start += len + if (start < 0) start = 0 + } else if (start > len) { + start = len + } + + if (end < 0) { + end += len + if (end < 0) end = 0 + } else if (end > len) { + end = len + } + + if (end < start) end = start + + var newBuf = this.subarray(start, end) + // Return an augmented `Uint8Array` instance + newBuf.__proto__ = Buffer.prototype + return newBuf +} + +/* + * Need to make sure that buffer isn't trying to write out of bounds. + */ +function checkOffset (offset, ext, length) { + if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint') + if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length') +} + +Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) { + offset = offset >>> 0 + byteLength = byteLength >>> 0 + if (!noAssert) checkOffset(offset, byteLength, this.length) + + var val = this[offset] + var mul = 1 + var i = 0 + while (++i < byteLength && (mul *= 0x100)) { + val += this[offset + i] * mul + } + + return val +} + +Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) { + offset = offset >>> 0 + byteLength = byteLength >>> 0 + if (!noAssert) { + checkOffset(offset, byteLength, this.length) + } + + var val = this[offset + --byteLength] + var mul = 1 + while (byteLength > 0 && (mul *= 0x100)) { + val += this[offset + --byteLength] * mul + } + + return val +} + +Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 1, this.length) + return this[offset] +} + +Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 2, this.length) + return this[offset] | (this[offset + 1] << 8) +} + +Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 2, this.length) + return (this[offset] << 8) | this[offset + 1] +} + +Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 4, this.length) + + return ((this[offset]) | + (this[offset + 1] << 8) | + (this[offset + 2] << 16)) + + (this[offset + 3] * 0x1000000) +} + +Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 4, this.length) + + return (this[offset] * 0x1000000) + + ((this[offset + 1] << 16) | + (this[offset + 2] << 8) | + this[offset + 3]) +} + +Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) { + offset = offset >>> 0 + byteLength = byteLength >>> 0 + if (!noAssert) checkOffset(offset, byteLength, this.length) + + var val = this[offset] + var mul = 1 + var i = 0 + while (++i < byteLength && (mul *= 0x100)) { + val += this[offset + i] * mul + } + mul *= 0x80 + + if (val >= mul) val -= Math.pow(2, 8 * byteLength) + + return val +} + +Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) { + offset = offset >>> 0 + byteLength = byteLength >>> 0 + if (!noAssert) checkOffset(offset, byteLength, this.length) + + var i = byteLength + var mul = 1 + var val = this[offset + --i] + while (i > 0 && (mul *= 0x100)) { + val += this[offset + --i] * mul + } + mul *= 0x80 + + if (val >= mul) val -= Math.pow(2, 8 * byteLength) + + return val +} + +Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 1, this.length) + if (!(this[offset] & 0x80)) return (this[offset]) + return ((0xff - this[offset] + 1) * -1) +} + +Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 2, this.length) + var val = this[offset] | (this[offset + 1] << 8) + return (val & 0x8000) ? val | 0xFFFF0000 : val +} + +Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 2, this.length) + var val = this[offset + 1] | (this[offset] << 8) + return (val & 0x8000) ? val | 0xFFFF0000 : val +} + +Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 4, this.length) + + return (this[offset]) | + (this[offset + 1] << 8) | + (this[offset + 2] << 16) | + (this[offset + 3] << 24) +} + +Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 4, this.length) + + return (this[offset] << 24) | + (this[offset + 1] << 16) | + (this[offset + 2] << 8) | + (this[offset + 3]) +} + +Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 4, this.length) + return ieee754.read(this, offset, true, 23, 4) +} + +Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 4, this.length) + return ieee754.read(this, offset, false, 23, 4) +} + +Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 8, this.length) + return ieee754.read(this, offset, true, 52, 8) +} + +Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) { + offset = offset >>> 0 + if (!noAssert) checkOffset(offset, 8, this.length) + return ieee754.read(this, offset, false, 52, 8) +} + +function checkInt (buf, value, offset, ext, max, min) { + if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance') + if (value > max || value < min) throw new RangeError('"value" argument is out of bounds') + if (offset + ext > buf.length) throw new RangeError('Index out of range') +} + +Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) { + value = +value + offset = offset >>> 0 + byteLength = byteLength >>> 0 + if (!noAssert) { + var maxBytes = Math.pow(2, 8 * byteLength) - 1 + checkInt(this, value, offset, byteLength, maxBytes, 0) + } + + var mul = 1 + var i = 0 + this[offset] = value & 0xFF + while (++i < byteLength && (mul *= 0x100)) { + this[offset + i] = (value / mul) & 0xFF + } + + return offset + byteLength +} + +Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) { + value = +value + offset = offset >>> 0 + byteLength = byteLength >>> 0 + if (!noAssert) { + var maxBytes = Math.pow(2, 8 * byteLength) - 1 + checkInt(this, value, offset, byteLength, maxBytes, 0) + } + + var i = byteLength - 1 + var mul = 1 + this[offset + i] = value & 0xFF + while (--i >= 0 && (mul *= 0x100)) { + this[offset + i] = (value / mul) & 0xFF + } + + return offset + byteLength +} + +Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0) + this[offset] = (value & 0xff) + return offset + 1 +} + +Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0) + this[offset] = (value & 0xff) + this[offset + 1] = (value >>> 8) + return offset + 2 +} + +Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0) + this[offset] = (value >>> 8) + this[offset + 1] = (value & 0xff) + return offset + 2 +} + +Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0) + this[offset + 3] = (value >>> 24) + this[offset + 2] = (value >>> 16) + this[offset + 1] = (value >>> 8) + this[offset] = (value & 0xff) + return offset + 4 +} + +Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0) + this[offset] = (value >>> 24) + this[offset + 1] = (value >>> 16) + this[offset + 2] = (value >>> 8) + this[offset + 3] = (value & 0xff) + return offset + 4 +} + +Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) { + var limit = Math.pow(2, (8 * byteLength) - 1) + + checkInt(this, value, offset, byteLength, limit - 1, -limit) + } + + var i = 0 + var mul = 1 + var sub = 0 + this[offset] = value & 0xFF + while (++i < byteLength && (mul *= 0x100)) { + if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) { + sub = 1 + } + this[offset + i] = ((value / mul) >> 0) - sub & 0xFF + } + + return offset + byteLength +} + +Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) { + var limit = Math.pow(2, (8 * byteLength) - 1) + + checkInt(this, value, offset, byteLength, limit - 1, -limit) + } + + var i = byteLength - 1 + var mul = 1 + var sub = 0 + this[offset + i] = value & 0xFF + while (--i >= 0 && (mul *= 0x100)) { + if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) { + sub = 1 + } + this[offset + i] = ((value / mul) >> 0) - sub & 0xFF + } + + return offset + byteLength +} + +Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80) + if (value < 0) value = 0xff + value + 1 + this[offset] = (value & 0xff) + return offset + 1 +} + +Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000) + this[offset] = (value & 0xff) + this[offset + 1] = (value >>> 8) + return offset + 2 +} + +Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000) + this[offset] = (value >>> 8) + this[offset + 1] = (value & 0xff) + return offset + 2 +} + +Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000) + this[offset] = (value & 0xff) + this[offset + 1] = (value >>> 8) + this[offset + 2] = (value >>> 16) + this[offset + 3] = (value >>> 24) + return offset + 4 +} + +Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000) + if (value < 0) value = 0xffffffff + value + 1 + this[offset] = (value >>> 24) + this[offset + 1] = (value >>> 16) + this[offset + 2] = (value >>> 8) + this[offset + 3] = (value & 0xff) + return offset + 4 +} + +function checkIEEE754 (buf, value, offset, ext, max, min) { + if (offset + ext > buf.length) throw new RangeError('Index out of range') + if (offset < 0) throw new RangeError('Index out of range') +} + +function writeFloat (buf, value, offset, littleEndian, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) { + checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38) + } + ieee754.write(buf, value, offset, littleEndian, 23, 4) + return offset + 4 +} + +Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) { + return writeFloat(this, value, offset, true, noAssert) +} + +Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) { + return writeFloat(this, value, offset, false, noAssert) +} + +function writeDouble (buf, value, offset, littleEndian, noAssert) { + value = +value + offset = offset >>> 0 + if (!noAssert) { + checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308) + } + ieee754.write(buf, value, offset, littleEndian, 52, 8) + return offset + 8 +} + +Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) { + return writeDouble(this, value, offset, true, noAssert) +} + +Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) { + return writeDouble(this, value, offset, false, noAssert) +} + +// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length) +Buffer.prototype.copy = function copy (target, targetStart, start, end) { + if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer') + if (!start) start = 0 + if (!end && end !== 0) end = this.length + if (targetStart >= target.length) targetStart = target.length + if (!targetStart) targetStart = 0 + if (end > 0 && end < start) end = start + + // Copy 0 bytes; we're done + if (end === start) return 0 + if (target.length === 0 || this.length === 0) return 0 + + // Fatal error conditions + if (targetStart < 0) { + throw new RangeError('targetStart out of bounds') + } + if (start < 0 || start >= this.length) throw new RangeError('Index out of range') + if (end < 0) throw new RangeError('sourceEnd out of bounds') + + // Are we oob? + if (end > this.length) end = this.length + if (target.length - targetStart < end - start) { + end = target.length - targetStart + start + } + + var len = end - start + + if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') { + // Use built-in when available, missing from IE11 + this.copyWithin(targetStart, start, end) + } else if (this === target && start < targetStart && targetStart < end) { + // descending copy from end + for (var i = len - 1; i >= 0; --i) { + target[i + targetStart] = this[i + start] + } + } else { + Uint8Array.prototype.set.call( + target, + this.subarray(start, end), + targetStart + ) + } + + return len +} + +// Usage: +// buffer.fill(number[, offset[, end]]) +// buffer.fill(buffer[, offset[, end]]) +// buffer.fill(string[, offset[, end]][, encoding]) +Buffer.prototype.fill = function fill (val, start, end, encoding) { + // Handle string cases: + if (typeof val === 'string') { + if (typeof start === 'string') { + encoding = start + start = 0 + end = this.length + } else if (typeof end === 'string') { + encoding = end + end = this.length + } + if (encoding !== undefined && typeof encoding !== 'string') { + throw new TypeError('encoding must be a string') + } + if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) { + throw new TypeError('Unknown encoding: ' + encoding) + } + if (val.length === 1) { + var code = val.charCodeAt(0) + if ((encoding === 'utf8' && code < 128) || + encoding === 'latin1') { + // Fast path: If `val` fits into a single byte, use that numeric value. + val = code + } + } + } else if (typeof val === 'number') { + val = val & 255 + } + + // Invalid ranges are not set to a default, so can range check early. + if (start < 0 || this.length < start || this.length < end) { + throw new RangeError('Out of range index') + } + + if (end <= start) { + return this + } + + start = start >>> 0 + end = end === undefined ? this.length : end >>> 0 + + if (!val) val = 0 + + var i + if (typeof val === 'number') { + for (i = start; i < end; ++i) { + this[i] = val + } + } else { + var bytes = Buffer.isBuffer(val) + ? val + : Buffer.from(val, encoding) + var len = bytes.length + if (len === 0) { + throw new TypeError('The value "' + val + + '" is invalid for argument "value"') + } + for (i = 0; i < end - start; ++i) { + this[i + start] = bytes[i % len] + } + } + + return this +} + +// HELPER FUNCTIONS +// ================ + +var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g + +function base64clean (str) { + // Node takes equal signs as end of the Base64 encoding + str = str.split('=')[0] + // Node strips out invalid characters like \n and \t from the string, base64-js does not + str = str.trim().replace(INVALID_BASE64_RE, '') + // Node converts strings with length < 2 to '' + if (str.length < 2) return '' + // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not + while (str.length % 4 !== 0) { + str = str + '=' + } + return str +} + +function toHex (n) { + if (n < 16) return '0' + n.toString(16) + return n.toString(16) +} + +function utf8ToBytes (string, units) { + units = units || Infinity + var codePoint + var length = string.length + var leadSurrogate = null + var bytes = [] + + for (var i = 0; i < length; ++i) { + codePoint = string.charCodeAt(i) + + // is surrogate component + if (codePoint > 0xD7FF && codePoint < 0xE000) { + // last char was a lead + if (!leadSurrogate) { + // no lead yet + if (codePoint > 0xDBFF) { + // unexpected trail + if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) + continue + } else if (i + 1 === length) { + // unpaired lead + if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) + continue + } + + // valid lead + leadSurrogate = codePoint + + continue + } + + // 2 leads in a row + if (codePoint < 0xDC00) { + if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) + leadSurrogate = codePoint + continue + } + + // valid surrogate pair + codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000 + } else if (leadSurrogate) { + // valid bmp char, but last char was a lead + if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) + } + + leadSurrogate = null + + // encode utf8 + if (codePoint < 0x80) { + if ((units -= 1) < 0) break + bytes.push(codePoint) + } else if (codePoint < 0x800) { + if ((units -= 2) < 0) break + bytes.push( + codePoint >> 0x6 | 0xC0, + codePoint & 0x3F | 0x80 + ) + } else if (codePoint < 0x10000) { + if ((units -= 3) < 0) break + bytes.push( + codePoint >> 0xC | 0xE0, + codePoint >> 0x6 & 0x3F | 0x80, + codePoint & 0x3F | 0x80 + ) + } else if (codePoint < 0x110000) { + if ((units -= 4) < 0) break + bytes.push( + codePoint >> 0x12 | 0xF0, + codePoint >> 0xC & 0x3F | 0x80, + codePoint >> 0x6 & 0x3F | 0x80, + codePoint & 0x3F | 0x80 + ) + } else { + throw new Error('Invalid code point') + } + } + + return bytes +} + +function asciiToBytes (str) { + var byteArray = [] + for (var i = 0; i < str.length; ++i) { + // Node's code seems to be doing this and not & 0x7F.. + byteArray.push(str.charCodeAt(i) & 0xFF) + } + return byteArray +} + +function utf16leToBytes (str, units) { + var c, hi, lo + var byteArray = [] + for (var i = 0; i < str.length; ++i) { + if ((units -= 2) < 0) break + + c = str.charCodeAt(i) + hi = c >> 8 + lo = c % 256 + byteArray.push(lo) + byteArray.push(hi) + } + + return byteArray +} + +function base64ToBytes (str) { + return base64.toByteArray(base64clean(str)) +} + +function blitBuffer (src, dst, offset, length) { + for (var i = 0; i < length; ++i) { + if ((i + offset >= dst.length) || (i >= src.length)) break + dst[i + offset] = src[i] + } + return i +} + +// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass +// the `instanceof` check but they should be treated as of that type. +// See: https://github.com/feross/buffer/issues/166 +function isInstance (obj, type) { + return obj instanceof type || + (obj != null && obj.constructor != null && obj.constructor.name != null && + obj.constructor.name === type.name) +} +function numberIsNaN (obj) { + // For IE11 support + return obj !== obj // eslint-disable-line no-self-compare +} + +}).call(this,require("buffer").Buffer) +},{"base64-js":10,"buffer":12,"ieee754":28}],13:[function(require,module,exports){ +(function (Buffer){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +// NOTE: These type checking functions intentionally don't use `instanceof` +// because it is fragile and can be easily faked with `Object.create()`. + +function isArray(arg) { + if (Array.isArray) { + return Array.isArray(arg); + } + return objectToString(arg) === '[object Array]'; +} +exports.isArray = isArray; + +function isBoolean(arg) { + return typeof arg === 'boolean'; +} +exports.isBoolean = isBoolean; + +function isNull(arg) { + return arg === null; +} +exports.isNull = isNull; + +function isNullOrUndefined(arg) { + return arg == null; +} +exports.isNullOrUndefined = isNullOrUndefined; + +function isNumber(arg) { + return typeof arg === 'number'; +} +exports.isNumber = isNumber; + +function isString(arg) { + return typeof arg === 'string'; +} +exports.isString = isString; + +function isSymbol(arg) { + return typeof arg === 'symbol'; +} +exports.isSymbol = isSymbol; + +function isUndefined(arg) { + return arg === void 0; +} +exports.isUndefined = isUndefined; + +function isRegExp(re) { + return objectToString(re) === '[object RegExp]'; +} +exports.isRegExp = isRegExp; + +function isObject(arg) { + return typeof arg === 'object' && arg !== null; +} +exports.isObject = isObject; + +function isDate(d) { + return objectToString(d) === '[object Date]'; +} +exports.isDate = isDate; + +function isError(e) { + return (objectToString(e) === '[object Error]' || e instanceof Error); +} +exports.isError = isError; + +function isFunction(arg) { + return typeof arg === 'function'; +} +exports.isFunction = isFunction; + +function isPrimitive(arg) { + return arg === null || + typeof arg === 'boolean' || + typeof arg === 'number' || + typeof arg === 'string' || + typeof arg === 'symbol' || // ES6 symbol + typeof arg === 'undefined'; +} +exports.isPrimitive = isPrimitive; + +exports.isBuffer = Buffer.isBuffer; + +function objectToString(o) { + return Object.prototype.toString.call(o); +} + +}).call(this,{"isBuffer":require("../../is-buffer/index.js")}) +},{"../../is-buffer/index.js":30}],14:[function(require,module,exports){ +(function (process){ +/* eslint-env browser */ + +/** + * This is the web browser implementation of `debug()`. + */ + +exports.log = log; +exports.formatArgs = formatArgs; +exports.save = save; +exports.load = load; +exports.useColors = useColors; +exports.storage = localstorage(); + +/** + * Colors. + */ + +exports.colors = [ + '#0000CC', + '#0000FF', + '#0033CC', + '#0033FF', + '#0066CC', + '#0066FF', + '#0099CC', + '#0099FF', + '#00CC00', + '#00CC33', + '#00CC66', + '#00CC99', + '#00CCCC', + '#00CCFF', + '#3300CC', + '#3300FF', + '#3333CC', + '#3333FF', + '#3366CC', + '#3366FF', + '#3399CC', + '#3399FF', + '#33CC00', + '#33CC33', + '#33CC66', + '#33CC99', + '#33CCCC', + '#33CCFF', + '#6600CC', + '#6600FF', + '#6633CC', + '#6633FF', + '#66CC00', + '#66CC33', + '#9900CC', + '#9900FF', + '#9933CC', + '#9933FF', + '#99CC00', + '#99CC33', + '#CC0000', + '#CC0033', + '#CC0066', + '#CC0099', + '#CC00CC', + '#CC00FF', + '#CC3300', + '#CC3333', + '#CC3366', + '#CC3399', + '#CC33CC', + '#CC33FF', + '#CC6600', + '#CC6633', + '#CC9900', + '#CC9933', + '#CCCC00', + '#CCCC33', + '#FF0000', + '#FF0033', + '#FF0066', + '#FF0099', + '#FF00CC', + '#FF00FF', + '#FF3300', + '#FF3333', + '#FF3366', + '#FF3399', + '#FF33CC', + '#FF33FF', + '#FF6600', + '#FF6633', + '#FF9900', + '#FF9933', + '#FFCC00', + '#FFCC33' +]; + +/** + * Currently only WebKit-based Web Inspectors, Firefox >= v31, + * and the Firebug extension (any Firefox version) are known + * to support "%c" CSS customizations. + * + * TODO: add a `localStorage` variable to explicitly enable/disable colors + */ + +// eslint-disable-next-line complexity +function useColors() { + // NB: In an Electron preload script, document will be defined but not fully + // initialized. Since we know we're in Chrome, we'll just detect this case + // explicitly + if (typeof window !== 'undefined' && window.process && (window.process.type === 'renderer' || window.process.__nwjs)) { + return true; + } + + // Internet Explorer and Edge do not support colors. + if (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/(edge|trident)\/(\d+)/)) { + return false; + } + + // Is webkit? http://stackoverflow.com/a/16459606/376773 + // document is undefined in react-native: https://github.com/facebook/react-native/pull/1632 + return (typeof document !== 'undefined' && document.documentElement && document.documentElement.style && document.documentElement.style.WebkitAppearance) || + // Is firebug? http://stackoverflow.com/a/398120/376773 + (typeof window !== 'undefined' && window.console && (window.console.firebug || (window.console.exception && window.console.table))) || + // Is firefox >= v31? + // https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages + (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31) || + // Double check webkit in userAgent just in case we are in a worker + (typeof navigator !== 'undefined' && navigator.userAgent && navigator.userAgent.toLowerCase().match(/applewebkit\/(\d+)/)); +} + +/** + * Colorize log arguments if enabled. + * + * @api public + */ + +function formatArgs(args) { + args[0] = (this.useColors ? '%c' : '') + + this.namespace + + (this.useColors ? ' %c' : ' ') + + args[0] + + (this.useColors ? '%c ' : ' ') + + '+' + module.exports.humanize(this.diff); + + if (!this.useColors) { + return; + } + + const c = 'color: ' + this.color; + args.splice(1, 0, c, 'color: inherit'); + + // The final "%c" is somewhat tricky, because there could be other + // arguments passed either before or after the %c, so we need to + // figure out the correct index to insert the CSS into + let index = 0; + let lastC = 0; + args[0].replace(/%[a-zA-Z%]/g, match => { + if (match === '%%') { + return; + } + index++; + if (match === '%c') { + // We only are interested in the *last* %c + // (the user may have provided their own) + lastC = index; + } + }); + + args.splice(lastC, 0, c); +} + +/** + * Invokes `console.log()` when available. + * No-op when `console.log` is not a "function". + * + * @api public + */ +function log(...args) { + // This hackery is required for IE8/9, where + // the `console.log` function doesn't have 'apply' + return typeof console === 'object' && + console.log && + console.log(...args); +} + +/** + * Save `namespaces`. + * + * @param {String} namespaces + * @api private + */ +function save(namespaces) { + try { + if (namespaces) { + exports.storage.setItem('debug', namespaces); + } else { + exports.storage.removeItem('debug'); + } + } catch (error) { + // Swallow + // XXX (@Qix-) should we be logging these? + } +} + +/** + * Load `namespaces`. + * + * @return {String} returns the previously persisted debug modes + * @api private + */ +function load() { + let r; + try { + r = exports.storage.getItem('debug'); + } catch (error) { + // Swallow + // XXX (@Qix-) should we be logging these? + } + + // If debug isn't set in LS, and we're in Electron, try to load $DEBUG + if (!r && typeof process !== 'undefined' && 'env' in process) { + r = process.env.DEBUG; + } + + return r; +} + +/** + * Localstorage attempts to return the localstorage. + * + * This is necessary because safari throws + * when a user disables cookies/localstorage + * and you attempt to access it. + * + * @return {LocalStorage} + * @api private + */ + +function localstorage() { + try { + // TVMLKit (Apple TV JS Runtime) does not have a window object, just localStorage in the global context + // The Browser also has localStorage in the global context. + return localStorage; + } catch (error) { + // Swallow + // XXX (@Qix-) should we be logging these? + } +} + +module.exports = require('./common')(exports); + +const {formatters} = module.exports; + +/** + * Map %j to `JSON.stringify()`, since no Web Inspectors do that by default. + */ + +formatters.j = function (v) { + try { + return JSON.stringify(v); + } catch (error) { + return '[UnexpectedJSONParseError]: ' + error.message; + } +}; + +}).call(this,require('_process')) +},{"./common":15,"_process":44}],15:[function(require,module,exports){ + +/** + * This is the common logic for both the Node.js and web browser + * implementations of `debug()`. + */ + +function setup(env) { + createDebug.debug = createDebug; + createDebug.default = createDebug; + createDebug.coerce = coerce; + createDebug.disable = disable; + createDebug.enable = enable; + createDebug.enabled = enabled; + createDebug.humanize = require('ms'); + + Object.keys(env).forEach(key => { + createDebug[key] = env[key]; + }); + + /** + * Active `debug` instances. + */ + createDebug.instances = []; + + /** + * The currently active debug mode names, and names to skip. + */ + + createDebug.names = []; + createDebug.skips = []; + + /** + * Map of special "%n" handling functions, for the debug "format" argument. + * + * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N". + */ + createDebug.formatters = {}; + + /** + * Selects a color for a debug namespace + * @param {String} namespace The namespace string for the for the debug instance to be colored + * @return {Number|String} An ANSI color code for the given namespace + * @api private + */ + function selectColor(namespace) { + let hash = 0; + + for (let i = 0; i < namespace.length; i++) { + hash = ((hash << 5) - hash) + namespace.charCodeAt(i); + hash |= 0; // Convert to 32bit integer + } + + return createDebug.colors[Math.abs(hash) % createDebug.colors.length]; + } + createDebug.selectColor = selectColor; + + /** + * Create a debugger with the given `namespace`. + * + * @param {String} namespace + * @return {Function} + * @api public + */ + function createDebug(namespace) { + let prevTime; + + function debug(...args) { + // Disabled? + if (!debug.enabled) { + return; + } + + const self = debug; + + // Set `diff` timestamp + const curr = Number(new Date()); + const ms = curr - (prevTime || curr); + self.diff = ms; + self.prev = prevTime; + self.curr = curr; + prevTime = curr; + + args[0] = createDebug.coerce(args[0]); + + if (typeof args[0] !== 'string') { + // Anything else let's inspect with %O + args.unshift('%O'); + } + + // Apply any `formatters` transformations + let index = 0; + args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => { + // If we encounter an escaped % then don't increase the array index + if (match === '%%') { + return match; + } + index++; + const formatter = createDebug.formatters[format]; + if (typeof formatter === 'function') { + const val = args[index]; + match = formatter.call(self, val); + + // Now we need to remove `args[index]` since it's inlined in the `format` + args.splice(index, 1); + index--; + } + return match; + }); + + // Apply env-specific formatting (colors, etc.) + createDebug.formatArgs.call(self, args); + + const logFn = self.log || createDebug.log; + logFn.apply(self, args); + } + + debug.namespace = namespace; + debug.enabled = createDebug.enabled(namespace); + debug.useColors = createDebug.useColors(); + debug.color = selectColor(namespace); + debug.destroy = destroy; + debug.extend = extend; + // Debug.formatArgs = formatArgs; + // debug.rawLog = rawLog; + + // env-specific initialization logic for debug instances + if (typeof createDebug.init === 'function') { + createDebug.init(debug); + } + + createDebug.instances.push(debug); + + return debug; + } + + function destroy() { + const index = createDebug.instances.indexOf(this); + if (index !== -1) { + createDebug.instances.splice(index, 1); + return true; + } + return false; + } + + function extend(namespace, delimiter) { + const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace); + newDebug.log = this.log; + return newDebug; + } + + /** + * Enables a debug mode by namespaces. This can include modes + * separated by a colon and wildcards. + * + * @param {String} namespaces + * @api public + */ + function enable(namespaces) { + createDebug.save(namespaces); + + createDebug.names = []; + createDebug.skips = []; + + let i; + const split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/); + const len = split.length; + + for (i = 0; i < len; i++) { + if (!split[i]) { + // ignore empty strings + continue; + } + + namespaces = split[i].replace(/\*/g, '.*?'); + + if (namespaces[0] === '-') { + createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$')); + } else { + createDebug.names.push(new RegExp('^' + namespaces + '$')); + } + } + + for (i = 0; i < createDebug.instances.length; i++) { + const instance = createDebug.instances[i]; + instance.enabled = createDebug.enabled(instance.namespace); + } + } + + /** + * Disable debug output. + * + * @return {String} namespaces + * @api public + */ + function disable() { + const namespaces = [ + ...createDebug.names.map(toNamespace), + ...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace) + ].join(','); + createDebug.enable(''); + return namespaces; + } + + /** + * Returns true if the given mode name is enabled, false otherwise. + * + * @param {String} name + * @return {Boolean} + * @api public + */ + function enabled(name) { + if (name[name.length - 1] === '*') { + return true; + } + + let i; + let len; + + for (i = 0, len = createDebug.skips.length; i < len; i++) { + if (createDebug.skips[i].test(name)) { + return false; + } + } + + for (i = 0, len = createDebug.names.length; i < len; i++) { + if (createDebug.names[i].test(name)) { + return true; + } + } + + return false; + } + + /** + * Convert regexp to namespace + * + * @param {RegExp} regxep + * @return {String} namespace + * @api private + */ + function toNamespace(regexp) { + return regexp.toString() + .substring(2, regexp.toString().length - 2) + .replace(/\.\*\?$/, '*'); + } + + /** + * Coerce `val`. + * + * @param {Mixed} val + * @return {Mixed} + * @api private + */ + function coerce(val) { + if (val instanceof Error) { + return val.stack || val.message; + } + return val; + } + + createDebug.enable(createDebug.load()); + + return createDebug; +} + +module.exports = setup; + +},{"ms":41}],16:[function(require,module,exports){ +(function (process,Buffer){ +var stream = require('readable-stream') +var eos = require('end-of-stream') +var inherits = require('inherits') +var shift = require('stream-shift') + +var SIGNAL_FLUSH = (Buffer.from && Buffer.from !== Uint8Array.from) + ? Buffer.from([0]) + : new Buffer([0]) + +var onuncork = function(self, fn) { + if (self._corked) self.once('uncork', fn) + else fn() +} + +var autoDestroy = function (self, err) { + if (self._autoDestroy) self.destroy(err) +} + +var destroyer = function(self, end) { + return function(err) { + if (err) autoDestroy(self, err.message === 'premature close' ? null : err) + else if (end && !self._ended) self.end() + } +} + +var end = function(ws, fn) { + if (!ws) return fn() + if (ws._writableState && ws._writableState.finished) return fn() + if (ws._writableState) return ws.end(fn) + ws.end() + fn() +} + +var toStreams2 = function(rs) { + return new (stream.Readable)({objectMode:true, highWaterMark:16}).wrap(rs) +} + +var Duplexify = function(writable, readable, opts) { + if (!(this instanceof Duplexify)) return new Duplexify(writable, readable, opts) + stream.Duplex.call(this, opts) + + this._writable = null + this._readable = null + this._readable2 = null + + this._autoDestroy = !opts || opts.autoDestroy !== false + this._forwardDestroy = !opts || opts.destroy !== false + this._forwardEnd = !opts || opts.end !== false + this._corked = 1 // start corked + this._ondrain = null + this._drained = false + this._forwarding = false + this._unwrite = null + this._unread = null + this._ended = false + + this.destroyed = false + + if (writable) this.setWritable(writable) + if (readable) this.setReadable(readable) +} + +inherits(Duplexify, stream.Duplex) + +Duplexify.obj = function(writable, readable, opts) { + if (!opts) opts = {} + opts.objectMode = true + opts.highWaterMark = 16 + return new Duplexify(writable, readable, opts) +} + +Duplexify.prototype.cork = function() { + if (++this._corked === 1) this.emit('cork') +} + +Duplexify.prototype.uncork = function() { + if (this._corked && --this._corked === 0) this.emit('uncork') +} + +Duplexify.prototype.setWritable = function(writable) { + if (this._unwrite) this._unwrite() + + if (this.destroyed) { + if (writable && writable.destroy) writable.destroy() + return + } + + if (writable === null || writable === false) { + this.end() + return + } + + var self = this + var unend = eos(writable, {writable:true, readable:false}, destroyer(this, this._forwardEnd)) + + var ondrain = function() { + var ondrain = self._ondrain + self._ondrain = null + if (ondrain) ondrain() + } + + var clear = function() { + self._writable.removeListener('drain', ondrain) + unend() + } + + if (this._unwrite) process.nextTick(ondrain) // force a drain on stream reset to avoid livelocks + + this._writable = writable + this._writable.on('drain', ondrain) + this._unwrite = clear + + this.uncork() // always uncork setWritable +} + +Duplexify.prototype.setReadable = function(readable) { + if (this._unread) this._unread() + + if (this.destroyed) { + if (readable && readable.destroy) readable.destroy() + return + } + + if (readable === null || readable === false) { + this.push(null) + this.resume() + return + } + + var self = this + var unend = eos(readable, {writable:false, readable:true}, destroyer(this)) + + var onreadable = function() { + self._forward() + } + + var onend = function() { + self.push(null) + } + + var clear = function() { + self._readable2.removeListener('readable', onreadable) + self._readable2.removeListener('end', onend) + unend() + } + + this._drained = true + this._readable = readable + this._readable2 = readable._readableState ? readable : toStreams2(readable) + this._readable2.on('readable', onreadable) + this._readable2.on('end', onend) + this._unread = clear + + this._forward() +} + +Duplexify.prototype._read = function() { + this._drained = true + this._forward() +} + +Duplexify.prototype._forward = function() { + if (this._forwarding || !this._readable2 || !this._drained) return + this._forwarding = true + + var data + + while (this._drained && (data = shift(this._readable2)) !== null) { + if (this.destroyed) continue + this._drained = this.push(data) + } + + this._forwarding = false +} + +Duplexify.prototype.destroy = function(err) { + if (this.destroyed) return + this.destroyed = true + + var self = this + process.nextTick(function() { + self._destroy(err) + }) +} + +Duplexify.prototype._destroy = function(err) { + if (err) { + var ondrain = this._ondrain + this._ondrain = null + if (ondrain) ondrain(err) + else this.emit('error', err) + } + + if (this._forwardDestroy) { + if (this._readable && this._readable.destroy) this._readable.destroy() + if (this._writable && this._writable.destroy) this._writable.destroy() + } + + this.emit('close') +} + +Duplexify.prototype._write = function(data, enc, cb) { + if (this.destroyed) return cb() + if (this._corked) return onuncork(this, this._write.bind(this, data, enc, cb)) + if (data === SIGNAL_FLUSH) return this._finish(cb) + if (!this._writable) return cb() + + if (this._writable.write(data) === false) this._ondrain = cb + else cb() +} + +Duplexify.prototype._finish = function(cb) { + var self = this + this.emit('preend') + onuncork(this, function() { + end(self._forwardEnd && self._writable, function() { + // haxx to not emit prefinish twice + if (self._writableState.prefinished === false) self._writableState.prefinished = true + self.emit('prefinish') + onuncork(self, cb) + }) + }) +} + +Duplexify.prototype.end = function(data, enc, cb) { + if (typeof data === 'function') return this.end(null, null, data) + if (typeof enc === 'function') return this.end(data, null, enc) + this._ended = true + if (data) this.write(data) + if (!this._writableState.ending) this.write(SIGNAL_FLUSH) + return stream.Writable.prototype.end.call(this, cb) +} + +module.exports = Duplexify + +}).call(this,require('_process'),require("buffer").Buffer) +},{"_process":44,"buffer":12,"end-of-stream":26,"inherits":29,"readable-stream":25,"stream-shift":62}],17:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +// a duplex stream is just a stream that is both readable and writable. +// Since JS doesn't have multiple prototypal inheritance, this class +// prototypally inherits from Readable, and then parasitically from +// Writable. + +'use strict'; + +/**/ + +var pna = require('process-nextick-args'); +/**/ + +/**/ +var objectKeys = Object.keys || function (obj) { + var keys = []; + for (var key in obj) { + keys.push(key); + }return keys; +}; +/**/ + +module.exports = Duplex; + +/**/ +var util = Object.create(require('core-util-is')); +util.inherits = require('inherits'); +/**/ + +var Readable = require('./_stream_readable'); +var Writable = require('./_stream_writable'); + +util.inherits(Duplex, Readable); + +{ + // avoid scope creep, the keys array can then be collected + var keys = objectKeys(Writable.prototype); + for (var v = 0; v < keys.length; v++) { + var method = keys[v]; + if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method]; + } +} + +function Duplex(options) { + if (!(this instanceof Duplex)) return new Duplex(options); + + Readable.call(this, options); + Writable.call(this, options); + + if (options && options.readable === false) this.readable = false; + + if (options && options.writable === false) this.writable = false; + + this.allowHalfOpen = true; + if (options && options.allowHalfOpen === false) this.allowHalfOpen = false; + + this.once('end', onend); +} + +Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function () { + return this._writableState.highWaterMark; + } +}); + +// the no-half-open enforcer +function onend() { + // if we allow half-open state, or if the writable side ended, + // then we're ok. + if (this.allowHalfOpen || this._writableState.ended) return; + + // no more data can be written. + // But allow more writes to happen in this tick. + pna.nextTick(onEndNT, this); +} + +function onEndNT(self) { + self.end(); +} + +Object.defineProperty(Duplex.prototype, 'destroyed', { + get: function () { + if (this._readableState === undefined || this._writableState === undefined) { + return false; + } + return this._readableState.destroyed && this._writableState.destroyed; + }, + set: function (value) { + // we ignore the value if the stream + // has not been initialized yet + if (this._readableState === undefined || this._writableState === undefined) { + return; + } + + // backward compatibility, the user is explicitly + // managing destroyed + this._readableState.destroyed = value; + this._writableState.destroyed = value; + } +}); + +Duplex.prototype._destroy = function (err, cb) { + this.push(null); + this.end(); + + pna.nextTick(cb, err); +}; +},{"./_stream_readable":19,"./_stream_writable":21,"core-util-is":13,"inherits":29,"process-nextick-args":43}],18:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +// a passthrough stream. +// basically just the most minimal sort of Transform stream. +// Every written chunk gets output as-is. + +'use strict'; + +module.exports = PassThrough; + +var Transform = require('./_stream_transform'); + +/**/ +var util = Object.create(require('core-util-is')); +util.inherits = require('inherits'); +/**/ + +util.inherits(PassThrough, Transform); + +function PassThrough(options) { + if (!(this instanceof PassThrough)) return new PassThrough(options); + + Transform.call(this, options); +} + +PassThrough.prototype._transform = function (chunk, encoding, cb) { + cb(null, chunk); +}; +},{"./_stream_transform":20,"core-util-is":13,"inherits":29}],19:[function(require,module,exports){ +(function (process,global){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +'use strict'; + +/**/ + +var pna = require('process-nextick-args'); +/**/ + +module.exports = Readable; + +/**/ +var isArray = require('isarray'); +/**/ + +/**/ +var Duplex; +/**/ + +Readable.ReadableState = ReadableState; + +/**/ +var EE = require('events').EventEmitter; + +var EElistenerCount = function (emitter, type) { + return emitter.listeners(type).length; +}; +/**/ + +/**/ +var Stream = require('./internal/streams/stream'); +/**/ + +/**/ + +var Buffer = require('safe-buffer').Buffer; +var OurUint8Array = global.Uint8Array || function () {}; +function _uint8ArrayToBuffer(chunk) { + return Buffer.from(chunk); +} +function _isUint8Array(obj) { + return Buffer.isBuffer(obj) || obj instanceof OurUint8Array; +} + +/**/ + +/**/ +var util = Object.create(require('core-util-is')); +util.inherits = require('inherits'); +/**/ + +/**/ +var debugUtil = require('util'); +var debug = void 0; +if (debugUtil && debugUtil.debuglog) { + debug = debugUtil.debuglog('stream'); +} else { + debug = function () {}; +} +/**/ + +var BufferList = require('./internal/streams/BufferList'); +var destroyImpl = require('./internal/streams/destroy'); +var StringDecoder; + +util.inherits(Readable, Stream); + +var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume']; + +function prependListener(emitter, event, fn) { + // Sadly this is not cacheable as some libraries bundle their own + // event emitter implementation with them. + if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn); + + // This is a hack to make sure that our error handler is attached before any + // userland ones. NEVER DO THIS. This is here only because this code needs + // to continue to work with older versions of Node.js that do not include + // the prependListener() method. The goal is to eventually remove this hack. + if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]]; +} + +function ReadableState(options, stream) { + Duplex = Duplex || require('./_stream_duplex'); + + options = options || {}; + + // Duplex streams are both readable and writable, but share + // the same options object. + // However, some cases require setting options to different + // values for the readable and the writable sides of the duplex stream. + // These options can be provided separately as readableXXX and writableXXX. + var isDuplex = stream instanceof Duplex; + + // object stream flag. Used to make read(n) ignore n and to + // make all the buffer merging and length checks go away + this.objectMode = !!options.objectMode; + + if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode; + + // the point at which it stops calling _read() to fill the buffer + // Note: 0 is a valid value, means "don't call _read preemptively ever" + var hwm = options.highWaterMark; + var readableHwm = options.readableHighWaterMark; + var defaultHwm = this.objectMode ? 16 : 16 * 1024; + + if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm; + + // cast to ints. + this.highWaterMark = Math.floor(this.highWaterMark); + + // A linked list is used to store data chunks instead of an array because the + // linked list can remove elements from the beginning faster than + // array.shift() + this.buffer = new BufferList(); + this.length = 0; + this.pipes = null; + this.pipesCount = 0; + this.flowing = null; + this.ended = false; + this.endEmitted = false; + this.reading = false; + + // a flag to be able to tell if the event 'readable'/'data' is emitted + // immediately, or on a later tick. We set this to true at first, because + // any actions that shouldn't happen until "later" should generally also + // not happen before the first read call. + this.sync = true; + + // whenever we return null, then we set a flag to say + // that we're awaiting a 'readable' event emission. + this.needReadable = false; + this.emittedReadable = false; + this.readableListening = false; + this.resumeScheduled = false; + + // has it been destroyed + this.destroyed = false; + + // Crypto is kind of old and crusty. Historically, its default string + // encoding is 'binary' so we have to make this configurable. + // Everything else in the universe uses 'utf8', though. + this.defaultEncoding = options.defaultEncoding || 'utf8'; + + // the number of writers that are awaiting a drain event in .pipe()s + this.awaitDrain = 0; + + // if true, a maybeReadMore has been scheduled + this.readingMore = false; + + this.decoder = null; + this.encoding = null; + if (options.encoding) { + if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder; + this.decoder = new StringDecoder(options.encoding); + this.encoding = options.encoding; + } +} + +function Readable(options) { + Duplex = Duplex || require('./_stream_duplex'); + + if (!(this instanceof Readable)) return new Readable(options); + + this._readableState = new ReadableState(options, this); + + // legacy + this.readable = true; + + if (options) { + if (typeof options.read === 'function') this._read = options.read; + + if (typeof options.destroy === 'function') this._destroy = options.destroy; + } + + Stream.call(this); +} + +Object.defineProperty(Readable.prototype, 'destroyed', { + get: function () { + if (this._readableState === undefined) { + return false; + } + return this._readableState.destroyed; + }, + set: function (value) { + // we ignore the value if the stream + // has not been initialized yet + if (!this._readableState) { + return; + } + + // backward compatibility, the user is explicitly + // managing destroyed + this._readableState.destroyed = value; + } +}); + +Readable.prototype.destroy = destroyImpl.destroy; +Readable.prototype._undestroy = destroyImpl.undestroy; +Readable.prototype._destroy = function (err, cb) { + this.push(null); + cb(err); +}; + +// Manually shove something into the read() buffer. +// This returns true if the highWaterMark has not been hit yet, +// similar to how Writable.write() returns true if you should +// write() some more. +Readable.prototype.push = function (chunk, encoding) { + var state = this._readableState; + var skipChunkCheck; + + if (!state.objectMode) { + if (typeof chunk === 'string') { + encoding = encoding || state.defaultEncoding; + if (encoding !== state.encoding) { + chunk = Buffer.from(chunk, encoding); + encoding = ''; + } + skipChunkCheck = true; + } + } else { + skipChunkCheck = true; + } + + return readableAddChunk(this, chunk, encoding, false, skipChunkCheck); +}; + +// Unshift should *always* be something directly out of read() +Readable.prototype.unshift = function (chunk) { + return readableAddChunk(this, chunk, null, true, false); +}; + +function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) { + var state = stream._readableState; + if (chunk === null) { + state.reading = false; + onEofChunk(stream, state); + } else { + var er; + if (!skipChunkCheck) er = chunkInvalid(state, chunk); + if (er) { + stream.emit('error', er); + } else if (state.objectMode || chunk && chunk.length > 0) { + if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) { + chunk = _uint8ArrayToBuffer(chunk); + } + + if (addToFront) { + if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true); + } else if (state.ended) { + stream.emit('error', new Error('stream.push() after EOF')); + } else { + state.reading = false; + if (state.decoder && !encoding) { + chunk = state.decoder.write(chunk); + if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state); + } else { + addChunk(stream, state, chunk, false); + } + } + } else if (!addToFront) { + state.reading = false; + } + } + + return needMoreData(state); +} + +function addChunk(stream, state, chunk, addToFront) { + if (state.flowing && state.length === 0 && !state.sync) { + stream.emit('data', chunk); + stream.read(0); + } else { + // update the buffer info. + state.length += state.objectMode ? 1 : chunk.length; + if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk); + + if (state.needReadable) emitReadable(stream); + } + maybeReadMore(stream, state); +} + +function chunkInvalid(state, chunk) { + var er; + if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) { + er = new TypeError('Invalid non-string/buffer chunk'); + } + return er; +} + +// if it's past the high water mark, we can push in some more. +// Also, if we have no data yet, we can stand some +// more bytes. This is to work around cases where hwm=0, +// such as the repl. Also, if the push() triggered a +// readable event, and the user called read(largeNumber) such that +// needReadable was set, then we ought to push more, so that another +// 'readable' event will be triggered. +function needMoreData(state) { + return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0); +} + +Readable.prototype.isPaused = function () { + return this._readableState.flowing === false; +}; + +// backwards compatibility. +Readable.prototype.setEncoding = function (enc) { + if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder; + this._readableState.decoder = new StringDecoder(enc); + this._readableState.encoding = enc; + return this; +}; + +// Don't raise the hwm > 8MB +var MAX_HWM = 0x800000; +function computeNewHighWaterMark(n) { + if (n >= MAX_HWM) { + n = MAX_HWM; + } else { + // Get the next highest power of 2 to prevent increasing hwm excessively in + // tiny amounts + n--; + n |= n >>> 1; + n |= n >>> 2; + n |= n >>> 4; + n |= n >>> 8; + n |= n >>> 16; + n++; + } + return n; +} + +// This function is designed to be inlinable, so please take care when making +// changes to the function body. +function howMuchToRead(n, state) { + if (n <= 0 || state.length === 0 && state.ended) return 0; + if (state.objectMode) return 1; + if (n !== n) { + // Only flow one buffer at a time + if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length; + } + // If we're asking for more than the current hwm, then raise the hwm. + if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n); + if (n <= state.length) return n; + // Don't have enough + if (!state.ended) { + state.needReadable = true; + return 0; + } + return state.length; +} + +// you can override either this method, or the async _read(n) below. +Readable.prototype.read = function (n) { + debug('read', n); + n = parseInt(n, 10); + var state = this._readableState; + var nOrig = n; + + if (n !== 0) state.emittedReadable = false; + + // if we're doing read(0) to trigger a readable event, but we + // already have a bunch of data in the buffer, then just trigger + // the 'readable' event and move on. + if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) { + debug('read: emitReadable', state.length, state.ended); + if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this); + return null; + } + + n = howMuchToRead(n, state); + + // if we've ended, and we're now clear, then finish it up. + if (n === 0 && state.ended) { + if (state.length === 0) endReadable(this); + return null; + } + + // All the actual chunk generation logic needs to be + // *below* the call to _read. The reason is that in certain + // synthetic stream cases, such as passthrough streams, _read + // may be a completely synchronous operation which may change + // the state of the read buffer, providing enough data when + // before there was *not* enough. + // + // So, the steps are: + // 1. Figure out what the state of things will be after we do + // a read from the buffer. + // + // 2. If that resulting state will trigger a _read, then call _read. + // Note that this may be asynchronous, or synchronous. Yes, it is + // deeply ugly to write APIs this way, but that still doesn't mean + // that the Readable class should behave improperly, as streams are + // designed to be sync/async agnostic. + // Take note if the _read call is sync or async (ie, if the read call + // has returned yet), so that we know whether or not it's safe to emit + // 'readable' etc. + // + // 3. Actually pull the requested chunks out of the buffer and return. + + // if we need a readable event, then we need to do some reading. + var doRead = state.needReadable; + debug('need readable', doRead); + + // if we currently have less than the highWaterMark, then also read some + if (state.length === 0 || state.length - n < state.highWaterMark) { + doRead = true; + debug('length less than watermark', doRead); + } + + // however, if we've ended, then there's no point, and if we're already + // reading, then it's unnecessary. + if (state.ended || state.reading) { + doRead = false; + debug('reading or ended', doRead); + } else if (doRead) { + debug('do read'); + state.reading = true; + state.sync = true; + // if the length is currently zero, then we *need* a readable event. + if (state.length === 0) state.needReadable = true; + // call internal read method + this._read(state.highWaterMark); + state.sync = false; + // If _read pushed data synchronously, then `reading` will be false, + // and we need to re-evaluate how much data we can return to the user. + if (!state.reading) n = howMuchToRead(nOrig, state); + } + + var ret; + if (n > 0) ret = fromList(n, state);else ret = null; + + if (ret === null) { + state.needReadable = true; + n = 0; + } else { + state.length -= n; + } + + if (state.length === 0) { + // If we have nothing in the buffer, then we want to know + // as soon as we *do* get something into the buffer. + if (!state.ended) state.needReadable = true; + + // If we tried to read() past the EOF, then emit end on the next tick. + if (nOrig !== n && state.ended) endReadable(this); + } + + if (ret !== null) this.emit('data', ret); + + return ret; +}; + +function onEofChunk(stream, state) { + if (state.ended) return; + if (state.decoder) { + var chunk = state.decoder.end(); + if (chunk && chunk.length) { + state.buffer.push(chunk); + state.length += state.objectMode ? 1 : chunk.length; + } + } + state.ended = true; + + // emit 'readable' now to make sure it gets picked up. + emitReadable(stream); +} + +// Don't emit readable right away in sync mode, because this can trigger +// another read() call => stack overflow. This way, it might trigger +// a nextTick recursion warning, but that's not so bad. +function emitReadable(stream) { + var state = stream._readableState; + state.needReadable = false; + if (!state.emittedReadable) { + debug('emitReadable', state.flowing); + state.emittedReadable = true; + if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream); + } +} + +function emitReadable_(stream) { + debug('emit readable'); + stream.emit('readable'); + flow(stream); +} + +// at this point, the user has presumably seen the 'readable' event, +// and called read() to consume some data. that may have triggered +// in turn another _read(n) call, in which case reading = true if +// it's in progress. +// However, if we're not ended, or reading, and the length < hwm, +// then go ahead and try to read some more preemptively. +function maybeReadMore(stream, state) { + if (!state.readingMore) { + state.readingMore = true; + pna.nextTick(maybeReadMore_, stream, state); + } +} + +function maybeReadMore_(stream, state) { + var len = state.length; + while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) { + debug('maybeReadMore read 0'); + stream.read(0); + if (len === state.length) + // didn't get any data, stop spinning. + break;else len = state.length; + } + state.readingMore = false; +} + +// abstract method. to be overridden in specific implementation classes. +// call cb(er, data) where data is <= n in length. +// for virtual (non-string, non-buffer) streams, "length" is somewhat +// arbitrary, and perhaps not very meaningful. +Readable.prototype._read = function (n) { + this.emit('error', new Error('_read() is not implemented')); +}; + +Readable.prototype.pipe = function (dest, pipeOpts) { + var src = this; + var state = this._readableState; + + switch (state.pipesCount) { + case 0: + state.pipes = dest; + break; + case 1: + state.pipes = [state.pipes, dest]; + break; + default: + state.pipes.push(dest); + break; + } + state.pipesCount += 1; + debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts); + + var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr; + + var endFn = doEnd ? onend : unpipe; + if (state.endEmitted) pna.nextTick(endFn);else src.once('end', endFn); + + dest.on('unpipe', onunpipe); + function onunpipe(readable, unpipeInfo) { + debug('onunpipe'); + if (readable === src) { + if (unpipeInfo && unpipeInfo.hasUnpiped === false) { + unpipeInfo.hasUnpiped = true; + cleanup(); + } + } + } + + function onend() { + debug('onend'); + dest.end(); + } + + // when the dest drains, it reduces the awaitDrain counter + // on the source. This would be more elegant with a .once() + // handler in flow(), but adding and removing repeatedly is + // too slow. + var ondrain = pipeOnDrain(src); + dest.on('drain', ondrain); + + var cleanedUp = false; + function cleanup() { + debug('cleanup'); + // cleanup event handlers once the pipe is broken + dest.removeListener('close', onclose); + dest.removeListener('finish', onfinish); + dest.removeListener('drain', ondrain); + dest.removeListener('error', onerror); + dest.removeListener('unpipe', onunpipe); + src.removeListener('end', onend); + src.removeListener('end', unpipe); + src.removeListener('data', ondata); + + cleanedUp = true; + + // if the reader is waiting for a drain event from this + // specific writer, then it would cause it to never start + // flowing again. + // So, if this is awaiting a drain, then we just call it now. + // If we don't know, then assume that we are waiting for one. + if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain(); + } + + // If the user pushes more data while we're writing to dest then we'll end up + // in ondata again. However, we only want to increase awaitDrain once because + // dest will only emit one 'drain' event for the multiple writes. + // => Introduce a guard on increasing awaitDrain. + var increasedAwaitDrain = false; + src.on('data', ondata); + function ondata(chunk) { + debug('ondata'); + increasedAwaitDrain = false; + var ret = dest.write(chunk); + if (false === ret && !increasedAwaitDrain) { + // If the user unpiped during `dest.write()`, it is possible + // to get stuck in a permanently paused state if that write + // also returned false. + // => Check whether `dest` is still a piping destination. + if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) { + debug('false write response, pause', src._readableState.awaitDrain); + src._readableState.awaitDrain++; + increasedAwaitDrain = true; + } + src.pause(); + } + } + + // if the dest has an error, then stop piping into it. + // however, don't suppress the throwing behavior for this. + function onerror(er) { + debug('onerror', er); + unpipe(); + dest.removeListener('error', onerror); + if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er); + } + + // Make sure our error handler is attached before userland ones. + prependListener(dest, 'error', onerror); + + // Both close and finish should trigger unpipe, but only once. + function onclose() { + dest.removeListener('finish', onfinish); + unpipe(); + } + dest.once('close', onclose); + function onfinish() { + debug('onfinish'); + dest.removeListener('close', onclose); + unpipe(); + } + dest.once('finish', onfinish); + + function unpipe() { + debug('unpipe'); + src.unpipe(dest); + } + + // tell the dest that it's being piped to + dest.emit('pipe', src); + + // start the flow if it hasn't been started already. + if (!state.flowing) { + debug('pipe resume'); + src.resume(); + } + + return dest; +}; + +function pipeOnDrain(src) { + return function () { + var state = src._readableState; + debug('pipeOnDrain', state.awaitDrain); + if (state.awaitDrain) state.awaitDrain--; + if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) { + state.flowing = true; + flow(src); + } + }; +} + +Readable.prototype.unpipe = function (dest) { + var state = this._readableState; + var unpipeInfo = { hasUnpiped: false }; + + // if we're not piping anywhere, then do nothing. + if (state.pipesCount === 0) return this; + + // just one destination. most common case. + if (state.pipesCount === 1) { + // passed in one, but it's not the right one. + if (dest && dest !== state.pipes) return this; + + if (!dest) dest = state.pipes; + + // got a match. + state.pipes = null; + state.pipesCount = 0; + state.flowing = false; + if (dest) dest.emit('unpipe', this, unpipeInfo); + return this; + } + + // slow case. multiple pipe destinations. + + if (!dest) { + // remove all. + var dests = state.pipes; + var len = state.pipesCount; + state.pipes = null; + state.pipesCount = 0; + state.flowing = false; + + for (var i = 0; i < len; i++) { + dests[i].emit('unpipe', this, unpipeInfo); + }return this; + } + + // try to find the right one. + var index = indexOf(state.pipes, dest); + if (index === -1) return this; + + state.pipes.splice(index, 1); + state.pipesCount -= 1; + if (state.pipesCount === 1) state.pipes = state.pipes[0]; + + dest.emit('unpipe', this, unpipeInfo); + + return this; +}; + +// set up data events if they are asked for +// Ensure readable listeners eventually get something +Readable.prototype.on = function (ev, fn) { + var res = Stream.prototype.on.call(this, ev, fn); + + if (ev === 'data') { + // Start flowing on next tick if stream isn't explicitly paused + if (this._readableState.flowing !== false) this.resume(); + } else if (ev === 'readable') { + var state = this._readableState; + if (!state.endEmitted && !state.readableListening) { + state.readableListening = state.needReadable = true; + state.emittedReadable = false; + if (!state.reading) { + pna.nextTick(nReadingNextTick, this); + } else if (state.length) { + emitReadable(this); + } + } + } + + return res; +}; +Readable.prototype.addListener = Readable.prototype.on; + +function nReadingNextTick(self) { + debug('readable nexttick read 0'); + self.read(0); +} + +// pause() and resume() are remnants of the legacy readable stream API +// If the user uses them, then switch into old mode. +Readable.prototype.resume = function () { + var state = this._readableState; + if (!state.flowing) { + debug('resume'); + state.flowing = true; + resume(this, state); + } + return this; +}; + +function resume(stream, state) { + if (!state.resumeScheduled) { + state.resumeScheduled = true; + pna.nextTick(resume_, stream, state); + } +} + +function resume_(stream, state) { + if (!state.reading) { + debug('resume read 0'); + stream.read(0); + } + + state.resumeScheduled = false; + state.awaitDrain = 0; + stream.emit('resume'); + flow(stream); + if (state.flowing && !state.reading) stream.read(0); +} + +Readable.prototype.pause = function () { + debug('call pause flowing=%j', this._readableState.flowing); + if (false !== this._readableState.flowing) { + debug('pause'); + this._readableState.flowing = false; + this.emit('pause'); + } + return this; +}; + +function flow(stream) { + var state = stream._readableState; + debug('flow', state.flowing); + while (state.flowing && stream.read() !== null) {} +} + +// wrap an old-style stream as the async data source. +// This is *not* part of the readable stream interface. +// It is an ugly unfortunate mess of history. +Readable.prototype.wrap = function (stream) { + var _this = this; + + var state = this._readableState; + var paused = false; + + stream.on('end', function () { + debug('wrapped end'); + if (state.decoder && !state.ended) { + var chunk = state.decoder.end(); + if (chunk && chunk.length) _this.push(chunk); + } + + _this.push(null); + }); + + stream.on('data', function (chunk) { + debug('wrapped data'); + if (state.decoder) chunk = state.decoder.write(chunk); + + // don't skip over falsy values in objectMode + if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return; + + var ret = _this.push(chunk); + if (!ret) { + paused = true; + stream.pause(); + } + }); + + // proxy all the other methods. + // important when wrapping filters and duplexes. + for (var i in stream) { + if (this[i] === undefined && typeof stream[i] === 'function') { + this[i] = function (method) { + return function () { + return stream[method].apply(stream, arguments); + }; + }(i); + } + } + + // proxy certain important events. + for (var n = 0; n < kProxyEvents.length; n++) { + stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n])); + } + + // when we try to consume some more bytes, simply unpause the + // underlying stream. + this._read = function (n) { + debug('wrapped _read', n); + if (paused) { + paused = false; + stream.resume(); + } + }; + + return this; +}; + +Object.defineProperty(Readable.prototype, 'readableHighWaterMark', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function () { + return this._readableState.highWaterMark; + } +}); + +// exposed for testing purposes only. +Readable._fromList = fromList; + +// Pluck off n bytes from an array of buffers. +// Length is the combined lengths of all the buffers in the list. +// This function is designed to be inlinable, so please take care when making +// changes to the function body. +function fromList(n, state) { + // nothing buffered + if (state.length === 0) return null; + + var ret; + if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) { + // read it all, truncate the list + if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length); + state.buffer.clear(); + } else { + // read part of list + ret = fromListPartial(n, state.buffer, state.decoder); + } + + return ret; +} + +// Extracts only enough buffered data to satisfy the amount requested. +// This function is designed to be inlinable, so please take care when making +// changes to the function body. +function fromListPartial(n, list, hasStrings) { + var ret; + if (n < list.head.data.length) { + // slice is the same for buffers and strings + ret = list.head.data.slice(0, n); + list.head.data = list.head.data.slice(n); + } else if (n === list.head.data.length) { + // first chunk is a perfect match + ret = list.shift(); + } else { + // result spans more than one buffer + ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list); + } + return ret; +} + +// Copies a specified amount of characters from the list of buffered data +// chunks. +// This function is designed to be inlinable, so please take care when making +// changes to the function body. +function copyFromBufferString(n, list) { + var p = list.head; + var c = 1; + var ret = p.data; + n -= ret.length; + while (p = p.next) { + var str = p.data; + var nb = n > str.length ? str.length : n; + if (nb === str.length) ret += str;else ret += str.slice(0, n); + n -= nb; + if (n === 0) { + if (nb === str.length) { + ++c; + if (p.next) list.head = p.next;else list.head = list.tail = null; + } else { + list.head = p; + p.data = str.slice(nb); + } + break; + } + ++c; + } + list.length -= c; + return ret; +} + +// Copies a specified amount of bytes from the list of buffered data chunks. +// This function is designed to be inlinable, so please take care when making +// changes to the function body. +function copyFromBuffer(n, list) { + var ret = Buffer.allocUnsafe(n); + var p = list.head; + var c = 1; + p.data.copy(ret); + n -= p.data.length; + while (p = p.next) { + var buf = p.data; + var nb = n > buf.length ? buf.length : n; + buf.copy(ret, ret.length - n, 0, nb); + n -= nb; + if (n === 0) { + if (nb === buf.length) { + ++c; + if (p.next) list.head = p.next;else list.head = list.tail = null; + } else { + list.head = p; + p.data = buf.slice(nb); + } + break; + } + ++c; + } + list.length -= c; + return ret; +} + +function endReadable(stream) { + var state = stream._readableState; + + // If we get here before consuming all the bytes, then that is a + // bug in node. Should never happen. + if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream'); + + if (!state.endEmitted) { + state.ended = true; + pna.nextTick(endReadableNT, state, stream); + } +} + +function endReadableNT(state, stream) { + // Check that we didn't get one last unshift. + if (!state.endEmitted && state.length === 0) { + state.endEmitted = true; + stream.readable = false; + stream.emit('end'); + } +} + +function indexOf(xs, x) { + for (var i = 0, l = xs.length; i < l; i++) { + if (xs[i] === x) return i; + } + return -1; +} +}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}) +},{"./_stream_duplex":17,"./internal/streams/BufferList":22,"./internal/streams/destroy":23,"./internal/streams/stream":24,"_process":44,"core-util-is":13,"events":27,"inherits":29,"isarray":31,"process-nextick-args":43,"safe-buffer":61,"string_decoder/":63,"util":11}],20:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +// a transform stream is a readable/writable stream where you do +// something with the data. Sometimes it's called a "filter", +// but that's not a great name for it, since that implies a thing where +// some bits pass through, and others are simply ignored. (That would +// be a valid example of a transform, of course.) +// +// While the output is causally related to the input, it's not a +// necessarily symmetric or synchronous transformation. For example, +// a zlib stream might take multiple plain-text writes(), and then +// emit a single compressed chunk some time in the future. +// +// Here's how this works: +// +// The Transform stream has all the aspects of the readable and writable +// stream classes. When you write(chunk), that calls _write(chunk,cb) +// internally, and returns false if there's a lot of pending writes +// buffered up. When you call read(), that calls _read(n) until +// there's enough pending readable data buffered up. +// +// In a transform stream, the written data is placed in a buffer. When +// _read(n) is called, it transforms the queued up data, calling the +// buffered _write cb's as it consumes chunks. If consuming a single +// written chunk would result in multiple output chunks, then the first +// outputted bit calls the readcb, and subsequent chunks just go into +// the read buffer, and will cause it to emit 'readable' if necessary. +// +// This way, back-pressure is actually determined by the reading side, +// since _read has to be called to start processing a new chunk. However, +// a pathological inflate type of transform can cause excessive buffering +// here. For example, imagine a stream where every byte of input is +// interpreted as an integer from 0-255, and then results in that many +// bytes of output. Writing the 4 bytes {ff,ff,ff,ff} would result in +// 1kb of data being output. In this case, you could write a very small +// amount of input, and end up with a very large amount of output. In +// such a pathological inflating mechanism, there'd be no way to tell +// the system to stop doing the transform. A single 4MB write could +// cause the system to run out of memory. +// +// However, even in such a pathological case, only a single written chunk +// would be consumed, and then the rest would wait (un-transformed) until +// the results of the previous transformed chunk were consumed. + +'use strict'; + +module.exports = Transform; + +var Duplex = require('./_stream_duplex'); + +/**/ +var util = Object.create(require('core-util-is')); +util.inherits = require('inherits'); +/**/ + +util.inherits(Transform, Duplex); + +function afterTransform(er, data) { + var ts = this._transformState; + ts.transforming = false; + + var cb = ts.writecb; + + if (!cb) { + return this.emit('error', new Error('write callback called multiple times')); + } + + ts.writechunk = null; + ts.writecb = null; + + if (data != null) // single equals check for both `null` and `undefined` + this.push(data); + + cb(er); + + var rs = this._readableState; + rs.reading = false; + if (rs.needReadable || rs.length < rs.highWaterMark) { + this._read(rs.highWaterMark); + } +} + +function Transform(options) { + if (!(this instanceof Transform)) return new Transform(options); + + Duplex.call(this, options); + + this._transformState = { + afterTransform: afterTransform.bind(this), + needTransform: false, + transforming: false, + writecb: null, + writechunk: null, + writeencoding: null + }; + + // start out asking for a readable event once data is transformed. + this._readableState.needReadable = true; + + // we have implemented the _read method, and done the other things + // that Readable wants before the first _read call, so unset the + // sync guard flag. + this._readableState.sync = false; + + if (options) { + if (typeof options.transform === 'function') this._transform = options.transform; + + if (typeof options.flush === 'function') this._flush = options.flush; + } + + // When the writable side finishes, then flush out anything remaining. + this.on('prefinish', prefinish); +} + +function prefinish() { + var _this = this; + + if (typeof this._flush === 'function') { + this._flush(function (er, data) { + done(_this, er, data); + }); + } else { + done(this, null, null); + } +} + +Transform.prototype.push = function (chunk, encoding) { + this._transformState.needTransform = false; + return Duplex.prototype.push.call(this, chunk, encoding); +}; + +// This is the part where you do stuff! +// override this function in implementation classes. +// 'chunk' is an input chunk. +// +// Call `push(newChunk)` to pass along transformed output +// to the readable side. You may call 'push' zero or more times. +// +// Call `cb(err)` when you are done with this chunk. If you pass +// an error, then that'll put the hurt on the whole operation. If you +// never call cb(), then you'll never get another chunk. +Transform.prototype._transform = function (chunk, encoding, cb) { + throw new Error('_transform() is not implemented'); +}; + +Transform.prototype._write = function (chunk, encoding, cb) { + var ts = this._transformState; + ts.writecb = cb; + ts.writechunk = chunk; + ts.writeencoding = encoding; + if (!ts.transforming) { + var rs = this._readableState; + if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark); + } +}; + +// Doesn't matter what the args are here. +// _transform does all the work. +// That we got here means that the readable side wants more data. +Transform.prototype._read = function (n) { + var ts = this._transformState; + + if (ts.writechunk !== null && ts.writecb && !ts.transforming) { + ts.transforming = true; + this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform); + } else { + // mark that we need a transform, so that any data that comes in + // will get processed, now that we've asked for it. + ts.needTransform = true; + } +}; + +Transform.prototype._destroy = function (err, cb) { + var _this2 = this; + + Duplex.prototype._destroy.call(this, err, function (err2) { + cb(err2); + _this2.emit('close'); + }); +}; + +function done(stream, er, data) { + if (er) return stream.emit('error', er); + + if (data != null) // single equals check for both `null` and `undefined` + stream.push(data); + + // if there's nothing in the write buffer, then that means + // that nothing more will ever be provided + if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0'); + + if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming'); + + return stream.push(null); +} +},{"./_stream_duplex":17,"core-util-is":13,"inherits":29}],21:[function(require,module,exports){ +(function (process,global,setImmediate){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +// A bit simpler than readable streams. +// Implement an async ._write(chunk, encoding, cb), and it'll handle all +// the drain event emission and buffering. + +'use strict'; + +/**/ + +var pna = require('process-nextick-args'); +/**/ + +module.exports = Writable; + +/* */ +function WriteReq(chunk, encoding, cb) { + this.chunk = chunk; + this.encoding = encoding; + this.callback = cb; + this.next = null; +} + +// It seems a linked list but it is not +// there will be only 2 of these for each stream +function CorkedRequest(state) { + var _this = this; + + this.next = null; + this.entry = null; + this.finish = function () { + onCorkedFinish(_this, state); + }; +} +/* */ + +/**/ +var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick; +/**/ + +/**/ +var Duplex; +/**/ + +Writable.WritableState = WritableState; + +/**/ +var util = Object.create(require('core-util-is')); +util.inherits = require('inherits'); +/**/ + +/**/ +var internalUtil = { + deprecate: require('util-deprecate') +}; +/**/ + +/**/ +var Stream = require('./internal/streams/stream'); +/**/ + +/**/ + +var Buffer = require('safe-buffer').Buffer; +var OurUint8Array = global.Uint8Array || function () {}; +function _uint8ArrayToBuffer(chunk) { + return Buffer.from(chunk); +} +function _isUint8Array(obj) { + return Buffer.isBuffer(obj) || obj instanceof OurUint8Array; +} + +/**/ + +var destroyImpl = require('./internal/streams/destroy'); + +util.inherits(Writable, Stream); + +function nop() {} + +function WritableState(options, stream) { + Duplex = Duplex || require('./_stream_duplex'); + + options = options || {}; + + // Duplex streams are both readable and writable, but share + // the same options object. + // However, some cases require setting options to different + // values for the readable and the writable sides of the duplex stream. + // These options can be provided separately as readableXXX and writableXXX. + var isDuplex = stream instanceof Duplex; + + // object stream flag to indicate whether or not this stream + // contains buffers or objects. + this.objectMode = !!options.objectMode; + + if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode; + + // the point at which write() starts returning false + // Note: 0 is a valid value, means that we always return false if + // the entire buffer is not flushed immediately on write() + var hwm = options.highWaterMark; + var writableHwm = options.writableHighWaterMark; + var defaultHwm = this.objectMode ? 16 : 16 * 1024; + + if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm; + + // cast to ints. + this.highWaterMark = Math.floor(this.highWaterMark); + + // if _final has been called + this.finalCalled = false; + + // drain event flag. + this.needDrain = false; + // at the start of calling end() + this.ending = false; + // when end() has been called, and returned + this.ended = false; + // when 'finish' is emitted + this.finished = false; + + // has it been destroyed + this.destroyed = false; + + // should we decode strings into buffers before passing to _write? + // this is here so that some node-core streams can optimize string + // handling at a lower level. + var noDecode = options.decodeStrings === false; + this.decodeStrings = !noDecode; + + // Crypto is kind of old and crusty. Historically, its default string + // encoding is 'binary' so we have to make this configurable. + // Everything else in the universe uses 'utf8', though. + this.defaultEncoding = options.defaultEncoding || 'utf8'; + + // not an actual buffer we keep track of, but a measurement + // of how much we're waiting to get pushed to some underlying + // socket or file. + this.length = 0; + + // a flag to see when we're in the middle of a write. + this.writing = false; + + // when true all writes will be buffered until .uncork() call + this.corked = 0; + + // a flag to be able to tell if the onwrite cb is called immediately, + // or on a later tick. We set this to true at first, because any + // actions that shouldn't happen until "later" should generally also + // not happen before the first write call. + this.sync = true; + + // a flag to know if we're processing previously buffered items, which + // may call the _write() callback in the same tick, so that we don't + // end up in an overlapped onwrite situation. + this.bufferProcessing = false; + + // the callback that's passed to _write(chunk,cb) + this.onwrite = function (er) { + onwrite(stream, er); + }; + + // the callback that the user supplies to write(chunk,encoding,cb) + this.writecb = null; + + // the amount that is being written when _write is called. + this.writelen = 0; + + this.bufferedRequest = null; + this.lastBufferedRequest = null; + + // number of pending user-supplied write callbacks + // this must be 0 before 'finish' can be emitted + this.pendingcb = 0; + + // emit prefinish if the only thing we're waiting for is _write cbs + // This is relevant for synchronous Transform streams + this.prefinished = false; + + // True if the error was already emitted and should not be thrown again + this.errorEmitted = false; + + // count buffered requests + this.bufferedRequestCount = 0; + + // allocate the first CorkedRequest, there is always + // one allocated and free to use, and we maintain at most two + this.corkedRequestsFree = new CorkedRequest(this); +} + +WritableState.prototype.getBuffer = function getBuffer() { + var current = this.bufferedRequest; + var out = []; + while (current) { + out.push(current); + current = current.next; + } + return out; +}; + +(function () { + try { + Object.defineProperty(WritableState.prototype, 'buffer', { + get: internalUtil.deprecate(function () { + return this.getBuffer(); + }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003') + }); + } catch (_) {} +})(); + +// Test _writableState for inheritance to account for Duplex streams, +// whose prototype chain only points to Readable. +var realHasInstance; +if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') { + realHasInstance = Function.prototype[Symbol.hasInstance]; + Object.defineProperty(Writable, Symbol.hasInstance, { + value: function (object) { + if (realHasInstance.call(this, object)) return true; + if (this !== Writable) return false; + + return object && object._writableState instanceof WritableState; + } + }); +} else { + realHasInstance = function (object) { + return object instanceof this; + }; +} + +function Writable(options) { + Duplex = Duplex || require('./_stream_duplex'); + + // Writable ctor is applied to Duplexes, too. + // `realHasInstance` is necessary because using plain `instanceof` + // would return false, as no `_writableState` property is attached. + + // Trying to use the custom `instanceof` for Writable here will also break the + // Node.js LazyTransform implementation, which has a non-trivial getter for + // `_writableState` that would lead to infinite recursion. + if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) { + return new Writable(options); + } + + this._writableState = new WritableState(options, this); + + // legacy. + this.writable = true; + + if (options) { + if (typeof options.write === 'function') this._write = options.write; + + if (typeof options.writev === 'function') this._writev = options.writev; + + if (typeof options.destroy === 'function') this._destroy = options.destroy; + + if (typeof options.final === 'function') this._final = options.final; + } + + Stream.call(this); +} + +// Otherwise people can pipe Writable streams, which is just wrong. +Writable.prototype.pipe = function () { + this.emit('error', new Error('Cannot pipe, not readable')); +}; + +function writeAfterEnd(stream, cb) { + var er = new Error('write after end'); + // TODO: defer error events consistently everywhere, not just the cb + stream.emit('error', er); + pna.nextTick(cb, er); +} + +// Checks that a user-supplied chunk is valid, especially for the particular +// mode the stream is in. Currently this means that `null` is never accepted +// and undefined/non-string values are only allowed in object mode. +function validChunk(stream, state, chunk, cb) { + var valid = true; + var er = false; + + if (chunk === null) { + er = new TypeError('May not write null values to stream'); + } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) { + er = new TypeError('Invalid non-string/buffer chunk'); + } + if (er) { + stream.emit('error', er); + pna.nextTick(cb, er); + valid = false; + } + return valid; +} + +Writable.prototype.write = function (chunk, encoding, cb) { + var state = this._writableState; + var ret = false; + var isBuf = !state.objectMode && _isUint8Array(chunk); + + if (isBuf && !Buffer.isBuffer(chunk)) { + chunk = _uint8ArrayToBuffer(chunk); + } + + if (typeof encoding === 'function') { + cb = encoding; + encoding = null; + } + + if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding; + + if (typeof cb !== 'function') cb = nop; + + if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) { + state.pendingcb++; + ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb); + } + + return ret; +}; + +Writable.prototype.cork = function () { + var state = this._writableState; + + state.corked++; +}; + +Writable.prototype.uncork = function () { + var state = this._writableState; + + if (state.corked) { + state.corked--; + + if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state); + } +}; + +Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) { + // node::ParseEncoding() requires lower case. + if (typeof encoding === 'string') encoding = encoding.toLowerCase(); + if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding); + this._writableState.defaultEncoding = encoding; + return this; +}; + +function decodeChunk(state, chunk, encoding) { + if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') { + chunk = Buffer.from(chunk, encoding); + } + return chunk; +} + +Object.defineProperty(Writable.prototype, 'writableHighWaterMark', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function () { + return this._writableState.highWaterMark; + } +}); + +// if we're already writing something, then just put this +// in the queue, and wait our turn. Otherwise, call _write +// If we return false, then we need a drain event, so set that flag. +function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) { + if (!isBuf) { + var newChunk = decodeChunk(state, chunk, encoding); + if (chunk !== newChunk) { + isBuf = true; + encoding = 'buffer'; + chunk = newChunk; + } + } + var len = state.objectMode ? 1 : chunk.length; + + state.length += len; + + var ret = state.length < state.highWaterMark; + // we must ensure that previous needDrain will not be reset to false. + if (!ret) state.needDrain = true; + + if (state.writing || state.corked) { + var last = state.lastBufferedRequest; + state.lastBufferedRequest = { + chunk: chunk, + encoding: encoding, + isBuf: isBuf, + callback: cb, + next: null + }; + if (last) { + last.next = state.lastBufferedRequest; + } else { + state.bufferedRequest = state.lastBufferedRequest; + } + state.bufferedRequestCount += 1; + } else { + doWrite(stream, state, false, len, chunk, encoding, cb); + } + + return ret; +} + +function doWrite(stream, state, writev, len, chunk, encoding, cb) { + state.writelen = len; + state.writecb = cb; + state.writing = true; + state.sync = true; + if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite); + state.sync = false; +} + +function onwriteError(stream, state, sync, er, cb) { + --state.pendingcb; + + if (sync) { + // defer the callback if we are being called synchronously + // to avoid piling up things on the stack + pna.nextTick(cb, er); + // this can emit finish, and it will always happen + // after error + pna.nextTick(finishMaybe, stream, state); + stream._writableState.errorEmitted = true; + stream.emit('error', er); + } else { + // the caller expect this to happen before if + // it is async + cb(er); + stream._writableState.errorEmitted = true; + stream.emit('error', er); + // this can emit finish, but finish must + // always follow error + finishMaybe(stream, state); + } +} + +function onwriteStateUpdate(state) { + state.writing = false; + state.writecb = null; + state.length -= state.writelen; + state.writelen = 0; +} + +function onwrite(stream, er) { + var state = stream._writableState; + var sync = state.sync; + var cb = state.writecb; + + onwriteStateUpdate(state); + + if (er) onwriteError(stream, state, sync, er, cb);else { + // Check if we're actually ready to finish, but don't emit yet + var finished = needFinish(state); + + if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) { + clearBuffer(stream, state); + } + + if (sync) { + /**/ + asyncWrite(afterWrite, stream, state, finished, cb); + /**/ + } else { + afterWrite(stream, state, finished, cb); + } + } +} + +function afterWrite(stream, state, finished, cb) { + if (!finished) onwriteDrain(stream, state); + state.pendingcb--; + cb(); + finishMaybe(stream, state); +} + +// Must force callback to be called on nextTick, so that we don't +// emit 'drain' before the write() consumer gets the 'false' return +// value, and has a chance to attach a 'drain' listener. +function onwriteDrain(stream, state) { + if (state.length === 0 && state.needDrain) { + state.needDrain = false; + stream.emit('drain'); + } +} + +// if there's something in the buffer waiting, then process it +function clearBuffer(stream, state) { + state.bufferProcessing = true; + var entry = state.bufferedRequest; + + if (stream._writev && entry && entry.next) { + // Fast case, write everything using _writev() + var l = state.bufferedRequestCount; + var buffer = new Array(l); + var holder = state.corkedRequestsFree; + holder.entry = entry; + + var count = 0; + var allBuffers = true; + while (entry) { + buffer[count] = entry; + if (!entry.isBuf) allBuffers = false; + entry = entry.next; + count += 1; + } + buffer.allBuffers = allBuffers; + + doWrite(stream, state, true, state.length, buffer, '', holder.finish); + + // doWrite is almost always async, defer these to save a bit of time + // as the hot path ends with doWrite + state.pendingcb++; + state.lastBufferedRequest = null; + if (holder.next) { + state.corkedRequestsFree = holder.next; + holder.next = null; + } else { + state.corkedRequestsFree = new CorkedRequest(state); + } + state.bufferedRequestCount = 0; + } else { + // Slow case, write chunks one-by-one + while (entry) { + var chunk = entry.chunk; + var encoding = entry.encoding; + var cb = entry.callback; + var len = state.objectMode ? 1 : chunk.length; + + doWrite(stream, state, false, len, chunk, encoding, cb); + entry = entry.next; + state.bufferedRequestCount--; + // if we didn't call the onwrite immediately, then + // it means that we need to wait until it does. + // also, that means that the chunk and cb are currently + // being processed, so move the buffer counter past them. + if (state.writing) { + break; + } + } + + if (entry === null) state.lastBufferedRequest = null; + } + + state.bufferedRequest = entry; + state.bufferProcessing = false; +} + +Writable.prototype._write = function (chunk, encoding, cb) { + cb(new Error('_write() is not implemented')); +}; + +Writable.prototype._writev = null; + +Writable.prototype.end = function (chunk, encoding, cb) { + var state = this._writableState; + + if (typeof chunk === 'function') { + cb = chunk; + chunk = null; + encoding = null; + } else if (typeof encoding === 'function') { + cb = encoding; + encoding = null; + } + + if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); + + // .end() fully uncorks + if (state.corked) { + state.corked = 1; + this.uncork(); + } + + // ignore unnecessary end() calls. + if (!state.ending && !state.finished) endWritable(this, state, cb); +}; + +function needFinish(state) { + return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing; +} +function callFinal(stream, state) { + stream._final(function (err) { + state.pendingcb--; + if (err) { + stream.emit('error', err); + } + state.prefinished = true; + stream.emit('prefinish'); + finishMaybe(stream, state); + }); +} +function prefinish(stream, state) { + if (!state.prefinished && !state.finalCalled) { + if (typeof stream._final === 'function') { + state.pendingcb++; + state.finalCalled = true; + pna.nextTick(callFinal, stream, state); + } else { + state.prefinished = true; + stream.emit('prefinish'); + } + } +} + +function finishMaybe(stream, state) { + var need = needFinish(state); + if (need) { + prefinish(stream, state); + if (state.pendingcb === 0) { + state.finished = true; + stream.emit('finish'); + } + } + return need; +} + +function endWritable(stream, state, cb) { + state.ending = true; + finishMaybe(stream, state); + if (cb) { + if (state.finished) pna.nextTick(cb);else stream.once('finish', cb); + } + state.ended = true; + stream.writable = false; +} + +function onCorkedFinish(corkReq, state, err) { + var entry = corkReq.entry; + corkReq.entry = null; + while (entry) { + var cb = entry.callback; + state.pendingcb--; + cb(err); + entry = entry.next; + } + if (state.corkedRequestsFree) { + state.corkedRequestsFree.next = corkReq; + } else { + state.corkedRequestsFree = corkReq; + } +} + +Object.defineProperty(Writable.prototype, 'destroyed', { + get: function () { + if (this._writableState === undefined) { + return false; + } + return this._writableState.destroyed; + }, + set: function (value) { + // we ignore the value if the stream + // has not been initialized yet + if (!this._writableState) { + return; + } + + // backward compatibility, the user is explicitly + // managing destroyed + this._writableState.destroyed = value; + } +}); + +Writable.prototype.destroy = destroyImpl.destroy; +Writable.prototype._undestroy = destroyImpl.undestroy; +Writable.prototype._destroy = function (err, cb) { + this.end(); + cb(err); +}; +}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("timers").setImmediate) +},{"./_stream_duplex":17,"./internal/streams/destroy":23,"./internal/streams/stream":24,"_process":44,"core-util-is":13,"inherits":29,"process-nextick-args":43,"safe-buffer":61,"timers":64,"util-deprecate":65}],22:[function(require,module,exports){ +'use strict'; + +function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } + +var Buffer = require('safe-buffer').Buffer; +var util = require('util'); + +function copyBuffer(src, target, offset) { + src.copy(target, offset); +} + +module.exports = function () { + function BufferList() { + _classCallCheck(this, BufferList); + + this.head = null; + this.tail = null; + this.length = 0; + } + + BufferList.prototype.push = function push(v) { + var entry = { data: v, next: null }; + if (this.length > 0) this.tail.next = entry;else this.head = entry; + this.tail = entry; + ++this.length; + }; + + BufferList.prototype.unshift = function unshift(v) { + var entry = { data: v, next: this.head }; + if (this.length === 0) this.tail = entry; + this.head = entry; + ++this.length; + }; + + BufferList.prototype.shift = function shift() { + if (this.length === 0) return; + var ret = this.head.data; + if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next; + --this.length; + return ret; + }; + + BufferList.prototype.clear = function clear() { + this.head = this.tail = null; + this.length = 0; + }; + + BufferList.prototype.join = function join(s) { + if (this.length === 0) return ''; + var p = this.head; + var ret = '' + p.data; + while (p = p.next) { + ret += s + p.data; + }return ret; + }; + + BufferList.prototype.concat = function concat(n) { + if (this.length === 0) return Buffer.alloc(0); + if (this.length === 1) return this.head.data; + var ret = Buffer.allocUnsafe(n >>> 0); + var p = this.head; + var i = 0; + while (p) { + copyBuffer(p.data, ret, i); + i += p.data.length; + p = p.next; + } + return ret; + }; + + return BufferList; +}(); + +if (util && util.inspect && util.inspect.custom) { + module.exports.prototype[util.inspect.custom] = function () { + var obj = util.inspect({ length: this.length }); + return this.constructor.name + ' ' + obj; + }; +} +},{"safe-buffer":61,"util":11}],23:[function(require,module,exports){ +'use strict'; + +/**/ + +var pna = require('process-nextick-args'); +/**/ + +// undocumented cb() API, needed for core, not for public API +function destroy(err, cb) { + var _this = this; + + var readableDestroyed = this._readableState && this._readableState.destroyed; + var writableDestroyed = this._writableState && this._writableState.destroyed; + + if (readableDestroyed || writableDestroyed) { + if (cb) { + cb(err); + } else if (err && (!this._writableState || !this._writableState.errorEmitted)) { + pna.nextTick(emitErrorNT, this, err); + } + return this; + } + + // we set destroyed to true before firing error callbacks in order + // to make it re-entrance safe in case destroy() is called within callbacks + + if (this._readableState) { + this._readableState.destroyed = true; + } + + // if this is a duplex stream mark the writable part as destroyed as well + if (this._writableState) { + this._writableState.destroyed = true; + } + + this._destroy(err || null, function (err) { + if (!cb && err) { + pna.nextTick(emitErrorNT, _this, err); + if (_this._writableState) { + _this._writableState.errorEmitted = true; + } + } else if (cb) { + cb(err); + } + }); + + return this; +} + +function undestroy() { + if (this._readableState) { + this._readableState.destroyed = false; + this._readableState.reading = false; + this._readableState.ended = false; + this._readableState.endEmitted = false; + } + + if (this._writableState) { + this._writableState.destroyed = false; + this._writableState.ended = false; + this._writableState.ending = false; + this._writableState.finished = false; + this._writableState.errorEmitted = false; + } +} + +function emitErrorNT(self, err) { + self.emit('error', err); +} + +module.exports = { + destroy: destroy, + undestroy: undestroy +}; +},{"process-nextick-args":43}],24:[function(require,module,exports){ +module.exports = require('events').EventEmitter; + +},{"events":27}],25:[function(require,module,exports){ +exports = module.exports = require('./lib/_stream_readable.js'); +exports.Stream = exports; +exports.Readable = exports; +exports.Writable = require('./lib/_stream_writable.js'); +exports.Duplex = require('./lib/_stream_duplex.js'); +exports.Transform = require('./lib/_stream_transform.js'); +exports.PassThrough = require('./lib/_stream_passthrough.js'); + +},{"./lib/_stream_duplex.js":17,"./lib/_stream_passthrough.js":18,"./lib/_stream_readable.js":19,"./lib/_stream_transform.js":20,"./lib/_stream_writable.js":21}],26:[function(require,module,exports){ +(function (process){ +var once = require('once'); + +var noop = function() {}; + +var isRequest = function(stream) { + return stream.setHeader && typeof stream.abort === 'function'; +}; + +var isChildProcess = function(stream) { + return stream.stdio && Array.isArray(stream.stdio) && stream.stdio.length === 3 +}; + +var eos = function(stream, opts, callback) { + if (typeof opts === 'function') return eos(stream, null, opts); + if (!opts) opts = {}; + + callback = once(callback || noop); + + var ws = stream._writableState; + var rs = stream._readableState; + var readable = opts.readable || (opts.readable !== false && stream.readable); + var writable = opts.writable || (opts.writable !== false && stream.writable); + var cancelled = false; + + var onlegacyfinish = function() { + if (!stream.writable) onfinish(); + }; + + var onfinish = function() { + writable = false; + if (!readable) callback.call(stream); + }; + + var onend = function() { + readable = false; + if (!writable) callback.call(stream); + }; + + var onexit = function(exitCode) { + callback.call(stream, exitCode ? new Error('exited with error code: ' + exitCode) : null); + }; + + var onerror = function(err) { + callback.call(stream, err); + }; + + var onclose = function() { + process.nextTick(onclosenexttick); + }; + + var onclosenexttick = function() { + if (cancelled) return; + if (readable && !(rs && (rs.ended && !rs.destroyed))) return callback.call(stream, new Error('premature close')); + if (writable && !(ws && (ws.ended && !ws.destroyed))) return callback.call(stream, new Error('premature close')); + }; + + var onrequest = function() { + stream.req.on('finish', onfinish); + }; + + if (isRequest(stream)) { + stream.on('complete', onfinish); + stream.on('abort', onclose); + if (stream.req) onrequest(); + else stream.on('request', onrequest); + } else if (writable && !ws) { // legacy streams + stream.on('end', onlegacyfinish); + stream.on('close', onlegacyfinish); + } + + if (isChildProcess(stream)) stream.on('exit', onexit); + + stream.on('end', onend); + stream.on('finish', onfinish); + if (opts.error !== false) stream.on('error', onerror); + stream.on('close', onclose); + + return function() { + cancelled = true; + stream.removeListener('complete', onfinish); + stream.removeListener('abort', onclose); + stream.removeListener('request', onrequest); + if (stream.req) stream.req.removeListener('finish', onfinish); + stream.removeListener('end', onlegacyfinish); + stream.removeListener('close', onlegacyfinish); + stream.removeListener('finish', onfinish); + stream.removeListener('exit', onexit); + stream.removeListener('end', onend); + stream.removeListener('error', onerror); + stream.removeListener('close', onclose); + }; +}; + +module.exports = eos; + +}).call(this,require('_process')) +},{"_process":44,"once":42}],27:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +var objectCreate = Object.create || objectCreatePolyfill +var objectKeys = Object.keys || objectKeysPolyfill +var bind = Function.prototype.bind || functionBindPolyfill + +function EventEmitter() { + if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) { + this._events = objectCreate(null); + this._eventsCount = 0; + } + + this._maxListeners = this._maxListeners || undefined; +} +module.exports = EventEmitter; + +// Backwards-compat with node 0.10.x +EventEmitter.EventEmitter = EventEmitter; + +EventEmitter.prototype._events = undefined; +EventEmitter.prototype._maxListeners = undefined; + +// By default EventEmitters will print a warning if more than 10 listeners are +// added to it. This is a useful default which helps finding memory leaks. +var defaultMaxListeners = 10; + +var hasDefineProperty; +try { + var o = {}; + if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 }); + hasDefineProperty = o.x === 0; +} catch (err) { hasDefineProperty = false } +if (hasDefineProperty) { + Object.defineProperty(EventEmitter, 'defaultMaxListeners', { + enumerable: true, + get: function() { + return defaultMaxListeners; + }, + set: function(arg) { + // check whether the input is a positive number (whose value is zero or + // greater and not a NaN). + if (typeof arg !== 'number' || arg < 0 || arg !== arg) + throw new TypeError('"defaultMaxListeners" must be a positive number'); + defaultMaxListeners = arg; + } + }); +} else { + EventEmitter.defaultMaxListeners = defaultMaxListeners; +} + +// Obviously not all Emitters should be limited to 10. This function allows +// that to be increased. Set to zero for unlimited. +EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) { + if (typeof n !== 'number' || n < 0 || isNaN(n)) + throw new TypeError('"n" argument must be a positive number'); + this._maxListeners = n; + return this; +}; + +function $getMaxListeners(that) { + if (that._maxListeners === undefined) + return EventEmitter.defaultMaxListeners; + return that._maxListeners; +} + +EventEmitter.prototype.getMaxListeners = function getMaxListeners() { + return $getMaxListeners(this); +}; + +// These standalone emit* functions are used to optimize calling of event +// handlers for fast cases because emit() itself often has a variable number of +// arguments and can be deoptimized because of that. These functions always have +// the same number of arguments and thus do not get deoptimized, so the code +// inside them can execute faster. +function emitNone(handler, isFn, self) { + if (isFn) + handler.call(self); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self); + } +} +function emitOne(handler, isFn, self, arg1) { + if (isFn) + handler.call(self, arg1); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self, arg1); + } +} +function emitTwo(handler, isFn, self, arg1, arg2) { + if (isFn) + handler.call(self, arg1, arg2); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self, arg1, arg2); + } +} +function emitThree(handler, isFn, self, arg1, arg2, arg3) { + if (isFn) + handler.call(self, arg1, arg2, arg3); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].call(self, arg1, arg2, arg3); + } +} + +function emitMany(handler, isFn, self, args) { + if (isFn) + handler.apply(self, args); + else { + var len = handler.length; + var listeners = arrayClone(handler, len); + for (var i = 0; i < len; ++i) + listeners[i].apply(self, args); + } +} + +EventEmitter.prototype.emit = function emit(type) { + var er, handler, len, args, i, events; + var doError = (type === 'error'); + + events = this._events; + if (events) + doError = (doError && events.error == null); + else if (!doError) + return false; + + // If there is no 'error' event listener then throw. + if (doError) { + if (arguments.length > 1) + er = arguments[1]; + if (er instanceof Error) { + throw er; // Unhandled 'error' event + } else { + // At least give some kind of context to the user + var err = new Error('Unhandled "error" event. (' + er + ')'); + err.context = er; + throw err; + } + return false; + } + + handler = events[type]; + + if (!handler) + return false; + + var isFn = typeof handler === 'function'; + len = arguments.length; + switch (len) { + // fast cases + case 1: + emitNone(handler, isFn, this); + break; + case 2: + emitOne(handler, isFn, this, arguments[1]); + break; + case 3: + emitTwo(handler, isFn, this, arguments[1], arguments[2]); + break; + case 4: + emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]); + break; + // slower + default: + args = new Array(len - 1); + for (i = 1; i < len; i++) + args[i - 1] = arguments[i]; + emitMany(handler, isFn, this, args); + } + + return true; +}; + +function _addListener(target, type, listener, prepend) { + var m; + var events; + var existing; + + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); + + events = target._events; + if (!events) { + events = target._events = objectCreate(null); + target._eventsCount = 0; + } else { + // To avoid recursion in the case that type === "newListener"! Before + // adding it to the listeners, first emit "newListener". + if (events.newListener) { + target.emit('newListener', type, + listener.listener ? listener.listener : listener); + + // Re-assign `events` because a newListener handler could have caused the + // this._events to be assigned to a new object + events = target._events; + } + existing = events[type]; + } + + if (!existing) { + // Optimize the case of one listener. Don't need the extra array object. + existing = events[type] = listener; + ++target._eventsCount; + } else { + if (typeof existing === 'function') { + // Adding the second element, need to change to array. + existing = events[type] = + prepend ? [listener, existing] : [existing, listener]; + } else { + // If we've already got an array, just append. + if (prepend) { + existing.unshift(listener); + } else { + existing.push(listener); + } + } + + // Check for listener leak + if (!existing.warned) { + m = $getMaxListeners(target); + if (m && m > 0 && existing.length > m) { + existing.warned = true; + var w = new Error('Possible EventEmitter memory leak detected. ' + + existing.length + ' "' + String(type) + '" listeners ' + + 'added. Use emitter.setMaxListeners() to ' + + 'increase limit.'); + w.name = 'MaxListenersExceededWarning'; + w.emitter = target; + w.type = type; + w.count = existing.length; + if (typeof console === 'object' && console.warn) { + console.warn('%s: %s', w.name, w.message); + } + } + } + } + + return target; +} + +EventEmitter.prototype.addListener = function addListener(type, listener) { + return _addListener(this, type, listener, false); +}; + +EventEmitter.prototype.on = EventEmitter.prototype.addListener; + +EventEmitter.prototype.prependListener = + function prependListener(type, listener) { + return _addListener(this, type, listener, true); + }; + +function onceWrapper() { + if (!this.fired) { + this.target.removeListener(this.type, this.wrapFn); + this.fired = true; + switch (arguments.length) { + case 0: + return this.listener.call(this.target); + case 1: + return this.listener.call(this.target, arguments[0]); + case 2: + return this.listener.call(this.target, arguments[0], arguments[1]); + case 3: + return this.listener.call(this.target, arguments[0], arguments[1], + arguments[2]); + default: + var args = new Array(arguments.length); + for (var i = 0; i < args.length; ++i) + args[i] = arguments[i]; + this.listener.apply(this.target, args); + } + } +} + +function _onceWrap(target, type, listener) { + var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener }; + var wrapped = bind.call(onceWrapper, state); + wrapped.listener = listener; + state.wrapFn = wrapped; + return wrapped; +} + +EventEmitter.prototype.once = function once(type, listener) { + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); + this.on(type, _onceWrap(this, type, listener)); + return this; +}; + +EventEmitter.prototype.prependOnceListener = + function prependOnceListener(type, listener) { + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); + this.prependListener(type, _onceWrap(this, type, listener)); + return this; + }; + +// Emits a 'removeListener' event if and only if the listener was removed. +EventEmitter.prototype.removeListener = + function removeListener(type, listener) { + var list, events, position, i, originalListener; + + if (typeof listener !== 'function') + throw new TypeError('"listener" argument must be a function'); + + events = this._events; + if (!events) + return this; + + list = events[type]; + if (!list) + return this; + + if (list === listener || list.listener === listener) { + if (--this._eventsCount === 0) + this._events = objectCreate(null); + else { + delete events[type]; + if (events.removeListener) + this.emit('removeListener', type, list.listener || listener); + } + } else if (typeof list !== 'function') { + position = -1; + + for (i = list.length - 1; i >= 0; i--) { + if (list[i] === listener || list[i].listener === listener) { + originalListener = list[i].listener; + position = i; + break; + } + } + + if (position < 0) + return this; + + if (position === 0) + list.shift(); + else + spliceOne(list, position); + + if (list.length === 1) + events[type] = list[0]; + + if (events.removeListener) + this.emit('removeListener', type, originalListener || listener); + } + + return this; + }; + +EventEmitter.prototype.removeAllListeners = + function removeAllListeners(type) { + var listeners, events, i; + + events = this._events; + if (!events) + return this; + + // not listening for removeListener, no need to emit + if (!events.removeListener) { + if (arguments.length === 0) { + this._events = objectCreate(null); + this._eventsCount = 0; + } else if (events[type]) { + if (--this._eventsCount === 0) + this._events = objectCreate(null); + else + delete events[type]; + } + return this; + } + + // emit removeListener for all listeners on all events + if (arguments.length === 0) { + var keys = objectKeys(events); + var key; + for (i = 0; i < keys.length; ++i) { + key = keys[i]; + if (key === 'removeListener') continue; + this.removeAllListeners(key); + } + this.removeAllListeners('removeListener'); + this._events = objectCreate(null); + this._eventsCount = 0; + return this; + } + + listeners = events[type]; + + if (typeof listeners === 'function') { + this.removeListener(type, listeners); + } else if (listeners) { + // LIFO order + for (i = listeners.length - 1; i >= 0; i--) { + this.removeListener(type, listeners[i]); + } + } + + return this; + }; + +function _listeners(target, type, unwrap) { + var events = target._events; + + if (!events) + return []; + + var evlistener = events[type]; + if (!evlistener) + return []; + + if (typeof evlistener === 'function') + return unwrap ? [evlistener.listener || evlistener] : [evlistener]; + + return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length); +} + +EventEmitter.prototype.listeners = function listeners(type) { + return _listeners(this, type, true); +}; + +EventEmitter.prototype.rawListeners = function rawListeners(type) { + return _listeners(this, type, false); +}; + +EventEmitter.listenerCount = function(emitter, type) { + if (typeof emitter.listenerCount === 'function') { + return emitter.listenerCount(type); + } else { + return listenerCount.call(emitter, type); + } +}; + +EventEmitter.prototype.listenerCount = listenerCount; +function listenerCount(type) { + var events = this._events; + + if (events) { + var evlistener = events[type]; + + if (typeof evlistener === 'function') { + return 1; + } else if (evlistener) { + return evlistener.length; + } + } + + return 0; +} + +EventEmitter.prototype.eventNames = function eventNames() { + return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : []; +}; + +// About 1.5x faster than the two-arg version of Array#splice(). +function spliceOne(list, index) { + for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1) + list[i] = list[k]; + list.pop(); +} + +function arrayClone(arr, n) { + var copy = new Array(n); + for (var i = 0; i < n; ++i) + copy[i] = arr[i]; + return copy; +} + +function unwrapListeners(arr) { + var ret = new Array(arr.length); + for (var i = 0; i < ret.length; ++i) { + ret[i] = arr[i].listener || arr[i]; + } + return ret; +} + +function objectCreatePolyfill(proto) { + var F = function() {}; + F.prototype = proto; + return new F; +} +function objectKeysPolyfill(obj) { + var keys = []; + for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k)) { + keys.push(k); + } + return k; +} +function functionBindPolyfill(context) { + var fn = this; + return function () { + return fn.apply(context, arguments); + }; +} + +},{}],28:[function(require,module,exports){ +exports.read = function (buffer, offset, isLE, mLen, nBytes) { + var e, m + var eLen = (nBytes * 8) - mLen - 1 + var eMax = (1 << eLen) - 1 + var eBias = eMax >> 1 + var nBits = -7 + var i = isLE ? (nBytes - 1) : 0 + var d = isLE ? -1 : 1 + var s = buffer[offset + i] + + i += d + + e = s & ((1 << (-nBits)) - 1) + s >>= (-nBits) + nBits += eLen + for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {} + + m = e & ((1 << (-nBits)) - 1) + e >>= (-nBits) + nBits += mLen + for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {} + + if (e === 0) { + e = 1 - eBias + } else if (e === eMax) { + return m ? NaN : ((s ? -1 : 1) * Infinity) + } else { + m = m + Math.pow(2, mLen) + e = e - eBias + } + return (s ? -1 : 1) * m * Math.pow(2, e - mLen) +} + +exports.write = function (buffer, value, offset, isLE, mLen, nBytes) { + var e, m, c + var eLen = (nBytes * 8) - mLen - 1 + var eMax = (1 << eLen) - 1 + var eBias = eMax >> 1 + var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0) + var i = isLE ? 0 : (nBytes - 1) + var d = isLE ? 1 : -1 + var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0 + + value = Math.abs(value) + + if (isNaN(value) || value === Infinity) { + m = isNaN(value) ? 1 : 0 + e = eMax + } else { + e = Math.floor(Math.log(value) / Math.LN2) + if (value * (c = Math.pow(2, -e)) < 1) { + e-- + c *= 2 + } + if (e + eBias >= 1) { + value += rt / c + } else { + value += rt * Math.pow(2, 1 - eBias) + } + if (value * c >= 2) { + e++ + c /= 2 + } + + if (e + eBias >= eMax) { + m = 0 + e = eMax + } else if (e + eBias >= 1) { + m = ((value * c) - 1) * Math.pow(2, mLen) + e = e + eBias + } else { + m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen) + e = 0 + } + } + + for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {} + + e = (e << mLen) | m + eLen += mLen + for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {} + + buffer[offset + i - d] |= s * 128 +} + +},{}],29:[function(require,module,exports){ +if (typeof Object.create === 'function') { + // implementation from standard node.js 'util' module + module.exports = function inherits(ctor, superCtor) { + if (superCtor) { + ctor.super_ = superCtor + ctor.prototype = Object.create(superCtor.prototype, { + constructor: { + value: ctor, + enumerable: false, + writable: true, + configurable: true + } + }) + } + }; +} else { + // old school shim for old browsers + module.exports = function inherits(ctor, superCtor) { + if (superCtor) { + ctor.super_ = superCtor + var TempCtor = function () {} + TempCtor.prototype = superCtor.prototype + ctor.prototype = new TempCtor() + ctor.prototype.constructor = ctor + } + } +} + +},{}],30:[function(require,module,exports){ +/*! + * Determine if an object is a Buffer + * + * @author Feross Aboukhadijeh + * @license MIT + */ + +// The _isBuffer check is for Safari 5-7 support, because it's missing +// Object.prototype.constructor. Remove this eventually +module.exports = function (obj) { + return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer) +} + +function isBuffer (obj) { + return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj) +} + +// For Node v0.10 support. Remove this eventually. +function isSlowBuffer (obj) { + return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0)) +} + +},{}],31:[function(require,module,exports){ +var toString = {}.toString; + +module.exports = Array.isArray || function (arr) { + return toString.call(arr) == '[object Array]'; +}; + +},{}],32:[function(require,module,exports){ +(function (Buffer){ +/* Protocol - protocol constants */ +const protocol = module.exports + +/* Command code => mnemonic */ +protocol.types = { + 0: 'reserved', + 1: 'connect', + 2: 'connack', + 3: 'publish', + 4: 'puback', + 5: 'pubrec', + 6: 'pubrel', + 7: 'pubcomp', + 8: 'subscribe', + 9: 'suback', + 10: 'unsubscribe', + 11: 'unsuback', + 12: 'pingreq', + 13: 'pingresp', + 14: 'disconnect', + 15: 'auth' +} + +/* Mnemonic => Command code */ +protocol.codes = {} +for (const k in protocol.types) { + const v = protocol.types[k] + protocol.codes[v] = k +} + +/* Header */ +protocol.CMD_SHIFT = 4 +protocol.CMD_MASK = 0xF0 +protocol.DUP_MASK = 0x08 +protocol.QOS_MASK = 0x03 +protocol.QOS_SHIFT = 1 +protocol.RETAIN_MASK = 0x01 + +/* Length */ +protocol.VARBYTEINT_MASK = 0x7F +protocol.VARBYTEINT_FIN_MASK = 0x80 + +/* Connack */ +protocol.SESSIONPRESENT_MASK = 0x01 +protocol.SESSIONPRESENT_HEADER = Buffer.from([protocol.SESSIONPRESENT_MASK]) +protocol.CONNACK_HEADER = Buffer.from([protocol.codes.connack << protocol.CMD_SHIFT]) + +/* Connect */ +protocol.USERNAME_MASK = 0x80 +protocol.PASSWORD_MASK = 0x40 +protocol.WILL_RETAIN_MASK = 0x20 +protocol.WILL_QOS_MASK = 0x18 +protocol.WILL_QOS_SHIFT = 3 +protocol.WILL_FLAG_MASK = 0x04 +protocol.CLEAN_SESSION_MASK = 0x02 +protocol.CONNECT_HEADER = Buffer.from([protocol.codes.connect << protocol.CMD_SHIFT]) + +/* Properties */ +protocol.properties = { + sessionExpiryInterval: 17, + willDelayInterval: 24, + receiveMaximum: 33, + maximumPacketSize: 39, + topicAliasMaximum: 34, + requestResponseInformation: 25, + requestProblemInformation: 23, + userProperties: 38, + authenticationMethod: 21, + authenticationData: 22, + payloadFormatIndicator: 1, + messageExpiryInterval: 2, + contentType: 3, + responseTopic: 8, + correlationData: 9, + maximumQoS: 36, + retainAvailable: 37, + assignedClientIdentifier: 18, + reasonString: 31, + wildcardSubscriptionAvailable: 40, + subscriptionIdentifiersAvailable: 41, + sharedSubscriptionAvailable: 42, + serverKeepAlive: 19, + responseInformation: 26, + serverReference: 28, + topicAlias: 35, + subscriptionIdentifier: 11 +} +protocol.propertiesCodes = {} +for (const prop in protocol.properties) { + const id = protocol.properties[prop] + protocol.propertiesCodes[id] = prop +} +protocol.propertiesTypes = { + sessionExpiryInterval: 'int32', + willDelayInterval: 'int32', + receiveMaximum: 'int16', + maximumPacketSize: 'int32', + topicAliasMaximum: 'int16', + requestResponseInformation: 'byte', + requestProblemInformation: 'byte', + userProperties: 'pair', + authenticationMethod: 'string', + authenticationData: 'binary', + payloadFormatIndicator: 'byte', + messageExpiryInterval: 'int32', + contentType: 'string', + responseTopic: 'string', + correlationData: 'binary', + maximumQoS: 'int8', + retainAvailable: 'byte', + assignedClientIdentifier: 'string', + reasonString: 'string', + wildcardSubscriptionAvailable: 'byte', + subscriptionIdentifiersAvailable: 'byte', + sharedSubscriptionAvailable: 'byte', + serverKeepAlive: 'int16', + responseInformation: 'string', + serverReference: 'string', + topicAlias: 'int16', + subscriptionIdentifier: 'var' +} + +function genHeader (type) { + return [0, 1, 2].map(qos => { + return [0, 1].map(dup => { + return [0, 1].map(retain => { + const buf = Buffer.alloc(1) + buf.writeUInt8( + protocol.codes[type] << protocol.CMD_SHIFT | + (dup ? protocol.DUP_MASK : 0) | + qos << protocol.QOS_SHIFT | retain, 0, true) + return buf + }) + }) + }) +} + +/* Publish */ +protocol.PUBLISH_HEADER = genHeader('publish') + +/* Subscribe */ +protocol.SUBSCRIBE_HEADER = genHeader('subscribe') +protocol.SUBSCRIBE_OPTIONS_QOS_MASK = 0x03 +protocol.SUBSCRIBE_OPTIONS_NL_MASK = 0x01 +protocol.SUBSCRIBE_OPTIONS_NL_SHIFT = 2 +protocol.SUBSCRIBE_OPTIONS_RAP_MASK = 0x01 +protocol.SUBSCRIBE_OPTIONS_RAP_SHIFT = 3 +protocol.SUBSCRIBE_OPTIONS_RH_MASK = 0x03 +protocol.SUBSCRIBE_OPTIONS_RH_SHIFT = 4 +protocol.SUBSCRIBE_OPTIONS_RH = [0x00, 0x10, 0x20] +protocol.SUBSCRIBE_OPTIONS_NL = 0x04 +protocol.SUBSCRIBE_OPTIONS_RAP = 0x08 +protocol.SUBSCRIBE_OPTIONS_QOS = [0x00, 0x01, 0x02] + +/* Unsubscribe */ +protocol.UNSUBSCRIBE_HEADER = genHeader('unsubscribe') + +/* Confirmations */ +protocol.ACKS = { + unsuback: genHeader('unsuback'), + puback: genHeader('puback'), + pubcomp: genHeader('pubcomp'), + pubrel: genHeader('pubrel'), + pubrec: genHeader('pubrec') +} + +protocol.SUBACK_HEADER = Buffer.from([protocol.codes.suback << protocol.CMD_SHIFT]) + +/* Protocol versions */ +protocol.VERSION3 = Buffer.from([3]) +protocol.VERSION4 = Buffer.from([4]) +protocol.VERSION5 = Buffer.from([5]) + +/* QoS */ +protocol.QOS = [0, 1, 2].map(qos => { + return Buffer.from([qos]) +}) + +/* Empty packets */ +protocol.EMPTY = { + pingreq: Buffer.from([protocol.codes.pingreq << 4, 0]), + pingresp: Buffer.from([protocol.codes.pingresp << 4, 0]), + disconnect: Buffer.from([protocol.codes.disconnect << 4, 0]) +} + +}).call(this,require("buffer").Buffer) +},{"buffer":12}],33:[function(require,module,exports){ +(function (Buffer){ +const writeToStream = require('./writeToStream') +const EventEmitter = require('events') + +function generate (packet, opts) { + const stream = new Accumulator() + writeToStream(packet, stream, opts) + return stream.concat() +} + +class Accumulator extends EventEmitter { + constructor () { + super() + this._array = new Array(20) + this._i = 0 + } + + write (chunk) { + this._array[this._i++] = chunk + return true + } + + concat () { + let length = 0 + const lengths = new Array(this._array.length) + const list = this._array + let pos = 0 + let i + + for (i = 0; i < list.length && list[i] !== undefined; i++) { + if (typeof list[i] !== 'string') lengths[i] = list[i].length + else lengths[i] = Buffer.byteLength(list[i]) + + length += lengths[i] + } + + const result = Buffer.allocUnsafe(length) + + for (i = 0; i < list.length && list[i] !== undefined; i++) { + if (typeof list[i] !== 'string') { + list[i].copy(result, pos) + pos += lengths[i] + } else { + result.write(list[i], pos) + pos += lengths[i] + } + } + + return result + } +} + +module.exports = generate + +}).call(this,require("buffer").Buffer) +},{"./writeToStream":40,"buffer":12,"events":27}],34:[function(require,module,exports){ +exports.parser = require('./parser').parser +exports.generate = require('./generate') +exports.writeToStream = require('./writeToStream') + +},{"./generate":33,"./parser":39,"./writeToStream":40}],35:[function(require,module,exports){ +'use strict' + +const { Buffer } = require('buffer') +const symbol = Symbol.for('BufferList') + +function BufferList (buf) { + if (!(this instanceof BufferList)) { + return new BufferList(buf) + } + + BufferList._init.call(this, buf) +} + +BufferList._init = function _init (buf) { + Object.defineProperty(this, symbol, { value: true }) + + this._bufs = [] + this.length = 0 + + if (buf) { + this.append(buf) + } +} + +BufferList.prototype._new = function _new (buf) { + return new BufferList(buf) +} + +BufferList.prototype._offset = function _offset (offset) { + if (offset === 0) { + return [0, 0] + } + + let tot = 0 + + for (let i = 0; i < this._bufs.length; i++) { + const _t = tot + this._bufs[i].length + if (offset < _t || i === this._bufs.length - 1) { + return [i, offset - tot] + } + tot = _t + } +} + +BufferList.prototype._reverseOffset = function (blOffset) { + const bufferId = blOffset[0] + let offset = blOffset[1] + + for (let i = 0; i < bufferId; i++) { + offset += this._bufs[i].length + } + + return offset +} + +BufferList.prototype.get = function get (index) { + if (index > this.length || index < 0) { + return undefined + } + + const offset = this._offset(index) + + return this._bufs[offset[0]][offset[1]] +} + +BufferList.prototype.slice = function slice (start, end) { + if (typeof start === 'number' && start < 0) { + start += this.length + } + + if (typeof end === 'number' && end < 0) { + end += this.length + } + + return this.copy(null, 0, start, end) +} + +BufferList.prototype.copy = function copy (dst, dstStart, srcStart, srcEnd) { + if (typeof srcStart !== 'number' || srcStart < 0) { + srcStart = 0 + } + + if (typeof srcEnd !== 'number' || srcEnd > this.length) { + srcEnd = this.length + } + + if (srcStart >= this.length) { + return dst || Buffer.alloc(0) + } + + if (srcEnd <= 0) { + return dst || Buffer.alloc(0) + } + + const copy = !!dst + const off = this._offset(srcStart) + const len = srcEnd - srcStart + let bytes = len + let bufoff = (copy && dstStart) || 0 + let start = off[1] + + // copy/slice everything + if (srcStart === 0 && srcEnd === this.length) { + if (!copy) { + // slice, but full concat if multiple buffers + return this._bufs.length === 1 + ? this._bufs[0] + : Buffer.concat(this._bufs, this.length) + } + + // copy, need to copy individual buffers + for (let i = 0; i < this._bufs.length; i++) { + this._bufs[i].copy(dst, bufoff) + bufoff += this._bufs[i].length + } + + return dst + } + + // easy, cheap case where it's a subset of one of the buffers + if (bytes <= this._bufs[off[0]].length - start) { + return copy + ? this._bufs[off[0]].copy(dst, dstStart, start, start + bytes) + : this._bufs[off[0]].slice(start, start + bytes) + } + + if (!copy) { + // a slice, we need something to copy in to + dst = Buffer.allocUnsafe(len) + } + + for (let i = off[0]; i < this._bufs.length; i++) { + const l = this._bufs[i].length - start + + if (bytes > l) { + this._bufs[i].copy(dst, bufoff, start) + bufoff += l + } else { + this._bufs[i].copy(dst, bufoff, start, start + bytes) + bufoff += l + break + } + + bytes -= l + + if (start) { + start = 0 + } + } + + // safeguard so that we don't return uninitialized memory + if (dst.length > bufoff) return dst.slice(0, bufoff) + + return dst +} + +BufferList.prototype.shallowSlice = function shallowSlice (start, end) { + start = start || 0 + end = typeof end !== 'number' ? this.length : end + + if (start < 0) { + start += this.length + } + + if (end < 0) { + end += this.length + } + + if (start === end) { + return this._new() + } + + const startOffset = this._offset(start) + const endOffset = this._offset(end) + const buffers = this._bufs.slice(startOffset[0], endOffset[0] + 1) + + if (endOffset[1] === 0) { + buffers.pop() + } else { + buffers[buffers.length - 1] = buffers[buffers.length - 1].slice(0, endOffset[1]) + } + + if (startOffset[1] !== 0) { + buffers[0] = buffers[0].slice(startOffset[1]) + } + + return this._new(buffers) +} + +BufferList.prototype.toString = function toString (encoding, start, end) { + return this.slice(start, end).toString(encoding) +} + +BufferList.prototype.consume = function consume (bytes) { + // first, normalize the argument, in accordance with how Buffer does it + bytes = Math.trunc(bytes) + // do nothing if not a positive number + if (Number.isNaN(bytes) || bytes <= 0) return this + + while (this._bufs.length) { + if (bytes >= this._bufs[0].length) { + bytes -= this._bufs[0].length + this.length -= this._bufs[0].length + this._bufs.shift() + } else { + this._bufs[0] = this._bufs[0].slice(bytes) + this.length -= bytes + break + } + } + + return this +} + +BufferList.prototype.duplicate = function duplicate () { + const copy = this._new() + + for (let i = 0; i < this._bufs.length; i++) { + copy.append(this._bufs[i]) + } + + return copy +} + +BufferList.prototype.append = function append (buf) { + if (buf == null) { + return this + } + + if (buf.buffer) { + // append a view of the underlying ArrayBuffer + this._appendBuffer(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength)) + } else if (Array.isArray(buf)) { + for (let i = 0; i < buf.length; i++) { + this.append(buf[i]) + } + } else if (this._isBufferList(buf)) { + // unwrap argument into individual BufferLists + for (let i = 0; i < buf._bufs.length; i++) { + this.append(buf._bufs[i]) + } + } else { + // coerce number arguments to strings, since Buffer(number) does + // uninitialized memory allocation + if (typeof buf === 'number') { + buf = buf.toString() + } + + this._appendBuffer(Buffer.from(buf)) + } + + return this +} + +BufferList.prototype._appendBuffer = function appendBuffer (buf) { + this._bufs.push(buf) + this.length += buf.length +} + +BufferList.prototype.indexOf = function (search, offset, encoding) { + if (encoding === undefined && typeof offset === 'string') { + encoding = offset + offset = undefined + } + + if (typeof search === 'function' || Array.isArray(search)) { + throw new TypeError('The "value" argument must be one of type string, Buffer, BufferList, or Uint8Array.') + } else if (typeof search === 'number') { + search = Buffer.from([search]) + } else if (typeof search === 'string') { + search = Buffer.from(search, encoding) + } else if (this._isBufferList(search)) { + search = search.slice() + } else if (Array.isArray(search.buffer)) { + search = Buffer.from(search.buffer, search.byteOffset, search.byteLength) + } else if (!Buffer.isBuffer(search)) { + search = Buffer.from(search) + } + + offset = Number(offset || 0) + + if (isNaN(offset)) { + offset = 0 + } + + if (offset < 0) { + offset = this.length + offset + } + + if (offset < 0) { + offset = 0 + } + + if (search.length === 0) { + return offset > this.length ? this.length : offset + } + + const blOffset = this._offset(offset) + let blIndex = blOffset[0] // index of which internal buffer we're working on + let buffOffset = blOffset[1] // offset of the internal buffer we're working on + + // scan over each buffer + for (; blIndex < this._bufs.length; blIndex++) { + const buff = this._bufs[blIndex] + + while (buffOffset < buff.length) { + const availableWindow = buff.length - buffOffset + + if (availableWindow >= search.length) { + const nativeSearchResult = buff.indexOf(search, buffOffset) + + if (nativeSearchResult !== -1) { + return this._reverseOffset([blIndex, nativeSearchResult]) + } + + buffOffset = buff.length - search.length + 1 // end of native search window + } else { + const revOffset = this._reverseOffset([blIndex, buffOffset]) + + if (this._match(revOffset, search)) { + return revOffset + } + + buffOffset++ + } + } + + buffOffset = 0 + } + + return -1 +} + +BufferList.prototype._match = function (offset, search) { + if (this.length - offset < search.length) { + return false + } + + for (let searchOffset = 0; searchOffset < search.length; searchOffset++) { + if (this.get(offset + searchOffset) !== search[searchOffset]) { + return false + } + } + return true +} + +;(function () { + const methods = { + readDoubleBE: 8, + readDoubleLE: 8, + readFloatBE: 4, + readFloatLE: 4, + readInt32BE: 4, + readInt32LE: 4, + readUInt32BE: 4, + readUInt32LE: 4, + readInt16BE: 2, + readInt16LE: 2, + readUInt16BE: 2, + readUInt16LE: 2, + readInt8: 1, + readUInt8: 1, + readIntBE: null, + readIntLE: null, + readUIntBE: null, + readUIntLE: null + } + + for (const m in methods) { + (function (m) { + if (methods[m] === null) { + BufferList.prototype[m] = function (offset, byteLength) { + return this.slice(offset, offset + byteLength)[m](0, byteLength) + } + } else { + BufferList.prototype[m] = function (offset) { + return this.slice(offset, offset + methods[m])[m](0) + } + } + }(m)) + } +}()) + +// Used internally by the class and also as an indicator of this object being +// a `BufferList`. It's not possible to use `instanceof BufferList` in a browser +// environment because there could be multiple different copies of the +// BufferList class and some `BufferList`s might be `BufferList`s. +BufferList.prototype._isBufferList = function _isBufferList (b) { + return b instanceof BufferList || BufferList.isBufferList(b) +} + +BufferList.isBufferList = function isBufferList (b) { + return b != null && b[symbol] +} + +module.exports = BufferList + +},{"buffer":12}],36:[function(require,module,exports){ +'use strict' + +const DuplexStream = require('readable-stream').Duplex +const inherits = require('inherits') +const BufferList = require('./BufferList') + +function BufferListStream (callback) { + if (!(this instanceof BufferListStream)) { + return new BufferListStream(callback) + } + + if (typeof callback === 'function') { + this._callback = callback + + const piper = function piper (err) { + if (this._callback) { + this._callback(err) + this._callback = null + } + }.bind(this) + + this.on('pipe', function onPipe (src) { + src.on('error', piper) + }) + this.on('unpipe', function onUnpipe (src) { + src.removeListener('error', piper) + }) + + callback = null + } + + BufferList._init.call(this, callback) + DuplexStream.call(this) +} + +inherits(BufferListStream, DuplexStream) +Object.assign(BufferListStream.prototype, BufferList.prototype) + +BufferListStream.prototype._new = function _new (callback) { + return new BufferListStream(callback) +} + +BufferListStream.prototype._write = function _write (buf, encoding, callback) { + this._appendBuffer(buf) + + if (typeof callback === 'function') { + callback() + } +} + +BufferListStream.prototype._read = function _read (size) { + if (!this.length) { + return this.push(null) + } + + size = Math.min(size, this.length) + this.push(this.slice(0, size)) + this.consume(size) +} + +BufferListStream.prototype.end = function end (chunk) { + DuplexStream.prototype.end.call(this, chunk) + + if (this._callback) { + this._callback(null, this.slice()) + this._callback = null + } +} + +BufferListStream.prototype._destroy = function _destroy (err, cb) { + this._bufs.length = 0 + this.length = 0 + cb(err) +} + +BufferListStream.prototype._isBufferList = function _isBufferList (b) { + return b instanceof BufferListStream || b instanceof BufferList || BufferListStream.isBufferList(b) +} + +BufferListStream.isBufferList = BufferList.isBufferList + +module.exports = BufferListStream +module.exports.BufferListStream = BufferListStream +module.exports.BufferList = BufferList + +},{"./BufferList":35,"inherits":29,"readable-stream":59}],37:[function(require,module,exports){ +(function (Buffer){ +const max = 65536 +const cache = {} + +// in node 6 Buffer.subarray returns a Uint8Array instead of a Buffer +// later versions return a Buffer +// alternative is Buffer.slice but that creates a new buffer +// creating new buffers takes time +// SubOk is only false on node < 8 +const SubOk = Buffer.isBuffer(Buffer.from([1, 2]).subarray(0, 1)) + +function generateBuffer (i) { + const buffer = Buffer.allocUnsafe(2) + buffer.writeUInt8(i >> 8, 0) + buffer.writeUInt8(i & 0x00FF, 0 + 1) + + return buffer +} + +function generateCache () { + for (let i = 0; i < max; i++) { + cache[i] = generateBuffer(i) + } +} + +function genBufVariableByteInt (num) { + const maxLength = 4 // max 4 bytes + let digit = 0 + let pos = 0 + const buffer = Buffer.allocUnsafe(maxLength) + + do { + digit = num % 128 | 0 + num = num / 128 | 0 + if (num > 0) digit = digit | 0x80 + + buffer.writeUInt8(digit, pos++) + } while (num > 0 && pos < maxLength) + + if (num > 0) { + pos = 0 + } + + return SubOk ? buffer.subarray(0, pos) : buffer.slice(0, pos) +} + +function generate4ByteBuffer (num) { + const buffer = Buffer.allocUnsafe(4) + buffer.writeUInt32BE(num, 0) + return buffer +} + +module.exports = { + cache, + generateCache, + generateNumber: generateBuffer, + genBufVariableByteInt, + generate4ByteBuffer +} + +}).call(this,require("buffer").Buffer) +},{"buffer":12}],38:[function(require,module,exports){ +class Packet { + constructor () { + this.cmd = null + this.retain = false + this.qos = 0 + this.dup = false + this.length = -1 + this.topic = null + this.payload = null + } +} + +module.exports = Packet + +},{}],39:[function(require,module,exports){ +const bl = require('bl') +const EventEmitter = require('events') +const Packet = require('./packet') +const constants = require('./constants') +const debug = require('debug')('mqtt-packet:parser') + +class Parser extends EventEmitter { + constructor () { + super() + this.parser = this.constructor.parser + } + + static parser (opt) { + if (!(this instanceof Parser)) return (new Parser()).parser(opt) + + this.settings = opt || {} + + this._states = [ + '_parseHeader', + '_parseLength', + '_parsePayload', + '_newPacket' + ] + + this._resetState() + return this + } + + _resetState () { + debug('_resetState: resetting packet, error, _list, and _stateCounter') + this.packet = new Packet() + this.error = null + this._list = bl() + this._stateCounter = 0 + } + + parse (buf) { + if (this.error) this._resetState() + + this._list.append(buf) + debug('parse: current state: %s', this._states[this._stateCounter]) + while ((this.packet.length !== -1 || this._list.length > 0) && + this[this._states[this._stateCounter]]() && + !this.error) { + this._stateCounter++ + debug('parse: state complete. _stateCounter is now: %d', this._stateCounter) + debug('parse: packet.length: %d, buffer list length: %d', this.packet.length, this._list.length) + if (this._stateCounter >= this._states.length) this._stateCounter = 0 + } + debug('parse: exited while loop. packet: %d, buffer list length: %d', this.packet.length, this._list.length) + return this._list.length + } + + _parseHeader () { + // There is at least one byte in the buffer + const zero = this._list.readUInt8(0) + this.packet.cmd = constants.types[zero >> constants.CMD_SHIFT] + this.packet.retain = (zero & constants.RETAIN_MASK) !== 0 + this.packet.qos = (zero >> constants.QOS_SHIFT) & constants.QOS_MASK + this.packet.dup = (zero & constants.DUP_MASK) !== 0 + debug('_parseHeader: packet: %o', this.packet) + + this._list.consume(1) + + return true + } + + _parseLength () { + // There is at least one byte in the list + const result = this._parseVarByteNum(true) + + if (result) { + this.packet.length = result.value + this._list.consume(result.bytes) + } else { + this._emitError(new Error('Invalid length')) + } + debug('_parseLength %d', result.value) + return !!result + } + + _parsePayload () { + debug('_parsePayload: payload %O', this._list) + let result = false + + // Do we have a payload? Do we have enough data to complete the payload? + // PINGs have no payload + if (this.packet.length === 0 || this._list.length >= this.packet.length) { + this._pos = 0 + + switch (this.packet.cmd) { + case 'connect': + this._parseConnect() + break + case 'connack': + this._parseConnack() + break + case 'publish': + this._parsePublish() + break + case 'puback': + case 'pubrec': + case 'pubrel': + case 'pubcomp': + this._parseConfirmation() + break + case 'subscribe': + this._parseSubscribe() + break + case 'suback': + this._parseSuback() + break + case 'unsubscribe': + this._parseUnsubscribe() + break + case 'unsuback': + this._parseUnsuback() + break + case 'pingreq': + case 'pingresp': + // These are empty, nothing to do + break + case 'disconnect': + this._parseDisconnect() + break + case 'auth': + this._parseAuth() + break + default: + this._emitError(new Error('Not supported')) + } + + result = true + } + debug('_parsePayload complete result: %s', result) + return result + } + + _parseConnect () { + debug('_parseConnect') + let topic // Will topic + let payload // Will payload + let password // Password + let username // Username + const flags = {} + const packet = this.packet + + // Parse protocolId + const protocolId = this._parseString() + + if (protocolId === null) return this._emitError(new Error('Cannot parse protocolId')) + if (protocolId !== 'MQTT' && protocolId !== 'MQIsdp') { + return this._emitError(new Error('Invalid protocolId')) + } + + packet.protocolId = protocolId + + // Parse constants version number + if (this._pos >= this._list.length) return this._emitError(new Error('Packet too short')) + + packet.protocolVersion = this._list.readUInt8(this._pos) + + if (packet.protocolVersion !== 3 && packet.protocolVersion !== 4 && packet.protocolVersion !== 5) { + return this._emitError(new Error('Invalid protocol version')) + } + + this._pos++ + + if (this._pos >= this._list.length) { + return this._emitError(new Error('Packet too short')) + } + + // Parse connect flags + flags.username = (this._list.readUInt8(this._pos) & constants.USERNAME_MASK) + flags.password = (this._list.readUInt8(this._pos) & constants.PASSWORD_MASK) + flags.will = (this._list.readUInt8(this._pos) & constants.WILL_FLAG_MASK) + + if (flags.will) { + packet.will = {} + packet.will.retain = (this._list.readUInt8(this._pos) & constants.WILL_RETAIN_MASK) !== 0 + packet.will.qos = (this._list.readUInt8(this._pos) & + constants.WILL_QOS_MASK) >> constants.WILL_QOS_SHIFT + } + + packet.clean = (this._list.readUInt8(this._pos) & constants.CLEAN_SESSION_MASK) !== 0 + this._pos++ + + // Parse keepalive + packet.keepalive = this._parseNum() + if (packet.keepalive === -1) return this._emitError(new Error('Packet too short')) + + // parse properties + if (packet.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + // Parse clientId + const clientId = this._parseString() + if (clientId === null) return this._emitError(new Error('Packet too short')) + packet.clientId = clientId + debug('_parseConnect: packet.clientId: %s', packet.clientId) + + if (flags.will) { + if (packet.protocolVersion === 5) { + const willProperties = this._parseProperties() + if (Object.getOwnPropertyNames(willProperties).length) { + packet.will.properties = willProperties + } + } + // Parse will topic + topic = this._parseString() + if (topic === null) return this._emitError(new Error('Cannot parse will topic')) + packet.will.topic = topic + debug('_parseConnect: packet.will.topic: %s', packet.will.topic) + + // Parse will payload + payload = this._parseBuffer() + if (payload === null) return this._emitError(new Error('Cannot parse will payload')) + packet.will.payload = payload + debug('_parseConnect: packet.will.paylaod: %s', packet.will.payload) + } + + // Parse username + if (flags.username) { + username = this._parseString() + if (username === null) return this._emitError(new Error('Cannot parse username')) + packet.username = username + debug('_parseConnect: packet.username: %s', packet.username) + } + + // Parse password + if (flags.password) { + password = this._parseBuffer() + if (password === null) return this._emitError(new Error('Cannot parse password')) + packet.password = password + } + // need for right parse auth packet and self set up + this.settings = packet + debug('_parseConnect: complete') + return packet + } + + _parseConnack () { + debug('_parseConnack') + const packet = this.packet + + if (this._list.length < 2) return null + + packet.sessionPresent = !!(this._list.readUInt8(this._pos++) & constants.SESSIONPRESENT_MASK) + if (this.settings.protocolVersion === 5) { + packet.reasonCode = this._list.readUInt8(this._pos++) + } else { + packet.returnCode = this._list.readUInt8(this._pos++) + } + + if (packet.returnCode === -1 || packet.reasonCode === -1) return this._emitError(new Error('Cannot parse return code')) + // mqtt 5 properties + if (this.settings.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + debug('_parseConnack: complete') + } + + _parsePublish () { + debug('_parsePublish') + const packet = this.packet + packet.topic = this._parseString() + + if (packet.topic === null) return this._emitError(new Error('Cannot parse topic')) + + // Parse messageId + if (packet.qos > 0) if (!this._parseMessageId()) { return } + + // Properties mqtt 5 + if (this.settings.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + + packet.payload = this._list.slice(this._pos, packet.length) + debug('_parsePublish: payload from buffer list: %o', packet.payload) + } + + _parseSubscribe () { + debug('_parseSubscribe') + const packet = this.packet + let topic + let options + let qos + let rh + let rap + let nl + let subscription + + if (packet.qos !== 1) { + return this._emitError(new Error('Wrong subscribe header')) + } + + packet.subscriptions = [] + + if (!this._parseMessageId()) { return } + + // Properties mqtt 5 + if (this.settings.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + + while (this._pos < packet.length) { + // Parse topic + topic = this._parseString() + if (topic === null) return this._emitError(new Error('Cannot parse topic')) + if (this._pos >= packet.length) return this._emitError(new Error('Malformed Subscribe Payload')) + + options = this._parseByte() + qos = options & constants.SUBSCRIBE_OPTIONS_QOS_MASK + nl = ((options >> constants.SUBSCRIBE_OPTIONS_NL_SHIFT) & constants.SUBSCRIBE_OPTIONS_NL_MASK) !== 0 + rap = ((options >> constants.SUBSCRIBE_OPTIONS_RAP_SHIFT) & constants.SUBSCRIBE_OPTIONS_RAP_MASK) !== 0 + rh = (options >> constants.SUBSCRIBE_OPTIONS_RH_SHIFT) & constants.SUBSCRIBE_OPTIONS_RH_MASK + + subscription = { topic, qos } + + // mqtt 5 options + if (this.settings.protocolVersion === 5) { + subscription.nl = nl + subscription.rap = rap + subscription.rh = rh + } + + // Push pair to subscriptions + debug('_parseSubscribe: push subscription `%s` to subscription', subscription) + packet.subscriptions.push(subscription) + } + } + + _parseSuback () { + debug('_parseSuback') + const packet = this.packet + this.packet.granted = [] + + if (!this._parseMessageId()) { return } + + // Properties mqtt 5 + if (this.settings.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + + // Parse granted QoSes + while (this._pos < this.packet.length) { + this.packet.granted.push(this._list.readUInt8(this._pos++)) + } + } + + _parseUnsubscribe () { + debug('_parseUnsubscribe') + const packet = this.packet + + packet.unsubscriptions = [] + + // Parse messageId + if (!this._parseMessageId()) { return } + + // Properties mqtt 5 + if (this.settings.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + + while (this._pos < packet.length) { + // Parse topic + const topic = this._parseString() + if (topic === null) return this._emitError(new Error('Cannot parse topic')) + + // Push topic to unsubscriptions + debug('_parseUnsubscribe: push topic `%s` to unsubscriptions', topic) + packet.unsubscriptions.push(topic) + } + } + + _parseUnsuback () { + debug('_parseUnsuback') + const packet = this.packet + if (!this._parseMessageId()) return this._emitError(new Error('Cannot parse messageId')) + // Properties mqtt 5 + if (this.settings.protocolVersion === 5) { + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + // Parse granted QoSes + packet.granted = [] + while (this._pos < this.packet.length) { + this.packet.granted.push(this._list.readUInt8(this._pos++)) + } + } + } + + // parse packets like puback, pubrec, pubrel, pubcomp + _parseConfirmation () { + debug('_parseConfirmation: packet.cmd: `%s`', this.packet.cmd) + const packet = this.packet + + this._parseMessageId() + + if (this.settings.protocolVersion === 5) { + if (packet.length > 2) { + // response code + packet.reasonCode = this._parseByte() + debug('_parseConfirmation: packet.reasonCode `%d`', packet.reasonCode) + } + + if (packet.length > 3) { + // properies mqtt 5 + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + } + + return true + } + + // parse disconnect packet + _parseDisconnect () { + const packet = this.packet + debug('_parseDisconnect') + + if (this.settings.protocolVersion === 5) { + // response code + packet.reasonCode = this._parseByte() + // properies mqtt 5 + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + } + + debug('_parseDisconnect result: true') + return true + } + + // parse auth packet + _parseAuth () { + debug('_parseAuth') + const packet = this.packet + + if (this.settings.protocolVersion !== 5) { + return this._emitError(new Error('Not supported auth packet for this version MQTT')) + } + + // response code + packet.reasonCode = this._parseByte() + // properies mqtt 5 + const properties = this._parseProperties() + if (Object.getOwnPropertyNames(properties).length) { + packet.properties = properties + } + + debug('_parseAuth: result: true') + return true + } + + _parseMessageId () { + const packet = this.packet + + packet.messageId = this._parseNum() + + if (packet.messageId === null) { + this._emitError(new Error('Cannot parse messageId')) + return false + } + + debug('_parseMessageId: packet.messageId %d', packet.messageId) + return true + } + + _parseString (maybeBuffer) { + const length = this._parseNum() + const end = length + this._pos + + if (length === -1 || end > this._list.length || end > this.packet.length) return null + + const result = this._list.toString('utf8', this._pos, end) + this._pos += length + debug('_parseString: result: %s', result) + return result + } + + _parseStringPair () { + debug('_parseStringPair') + return { + name: this._parseString(), + value: this._parseString() + } + } + + _parseBuffer () { + const length = this._parseNum() + const end = length + this._pos + + if (length === -1 || end > this._list.length || end > this.packet.length) return null + + const result = this._list.slice(this._pos, end) + + this._pos += length + debug('_parseBuffer: result: %o', result) + return result + } + + _parseNum () { + if (this._list.length - this._pos < 2) return -1 + + const result = this._list.readUInt16BE(this._pos) + this._pos += 2 + debug('_parseNum: result: %s', result) + return result + } + + _parse4ByteNum () { + if (this._list.length - this._pos < 4) return -1 + + const result = this._list.readUInt32BE(this._pos) + this._pos += 4 + debug('_parse4ByteNum: result: %s', result) + return result + } + + _parseVarByteNum (fullInfoFlag) { + debug('_parseVarByteNum') + let bytes = 0 + let mul = 1 + let value = 0 + let result = false + let current + const padding = this._pos ? this._pos : 0 + + while (bytes < 5) { + current = this._list.readUInt8(padding + bytes++) + value += mul * (current & constants.VARBYTEINT_MASK) + mul *= 0x80 + + if ((current & constants.VARBYTEINT_FIN_MASK) === 0) { + result = true + break + } + if (this._list.length <= bytes) { + break + } + } + + if (padding) { + this._pos += bytes + } + + result = result + ? fullInfoFlag ? { + bytes, + value + } : value + : false + + debug('_parseVarByteNum: result: %o', result) + return result + } + + _parseByte () { + const result = this._list.readUInt8(this._pos) + this._pos++ + debug('_parseByte: result: %o', result) + return result + } + + _parseByType (type) { + debug('_parseByType: type: %s', type) + switch (type) { + case 'byte': { + return this._parseByte() !== 0 + } + case 'int8': { + return this._parseByte() + } + case 'int16': { + return this._parseNum() + } + case 'int32': { + return this._parse4ByteNum() + } + case 'var': { + return this._parseVarByteNum() + } + case 'string': { + return this._parseString() + } + case 'pair': { + return this._parseStringPair() + } + case 'binary': { + return this._parseBuffer() + } + } + } + + _parseProperties () { + debug('_parseProperties') + const length = this._parseVarByteNum() + const start = this._pos + const end = start + length + const result = {} + while (this._pos < end) { + const type = this._parseByte() + const name = constants.propertiesCodes[type] + if (!name) { + this._emitError(new Error('Unknown property')) + return false + } + // user properties process + if (name === 'userProperties') { + if (!result[name]) { + result[name] = Object.create(null) + } + const currentUserProperty = this._parseByType(constants.propertiesTypes[name]) + if (result[name][currentUserProperty.name]) { + if (Array.isArray(result[name][currentUserProperty.name])) { + result[name][currentUserProperty.name].push(currentUserProperty.value) + } else { + const currentValue = result[name][currentUserProperty.name] + result[name][currentUserProperty.name] = [currentValue] + result[name][currentUserProperty.name].push(currentUserProperty.value) + } + } else { + result[name][currentUserProperty.name] = currentUserProperty.value + } + continue + } + if (result[name]) { + if (Array.isArray(result[name])) { + result[name].push(this._parseByType(constants.propertiesTypes[name])) + } else { + result[name] = [result[name]] + result[name].push(this._parseByType(constants.propertiesTypes[name])) + } + } else { + result[name] = this._parseByType(constants.propertiesTypes[name]) + } + } + return result + } + + _newPacket () { + debug('_newPacket') + if (this.packet) { + this._list.consume(this.packet.length) + debug('_newPacket: parser emit packet: packet.cmd: %s, packet.payload: %s, packet.length: %d', this.packet.cmd, this.packet.payload, this.packet.length) + this.emit('packet', this.packet) + } + debug('_newPacket: new packet') + this.packet = new Packet() + + this._pos = 0 + + return true + } + + _emitError (err) { + debug('_emitError') + this.error = err + this.emit('error', err) + } +} + +module.exports = Parser + +},{"./constants":32,"./packet":38,"bl":36,"debug":14,"events":27}],40:[function(require,module,exports){ +(function (Buffer){ +const protocol = require('./constants') +const empty = Buffer.allocUnsafe(0) +const zeroBuf = Buffer.from([0]) +const numbers = require('./numbers') +const nextTick = require('process-nextick-args').nextTick +const debug = require('debug')('mqtt-packet:writeToStream') + +const numCache = numbers.cache +const generateNumber = numbers.generateNumber +const generateCache = numbers.generateCache +const genBufVariableByteInt = numbers.genBufVariableByteInt +const generate4ByteBuffer = numbers.generate4ByteBuffer +let writeNumber = writeNumberCached +let toGenerate = true + +function generate (packet, stream, opts) { + debug('generate called') + if (stream.cork) { + stream.cork() + nextTick(uncork, stream) + } + + if (toGenerate) { + toGenerate = false + generateCache() + } + debug('generate: packet.cmd: %s', packet.cmd) + switch (packet.cmd) { + case 'connect': + return connect(packet, stream, opts) + case 'connack': + return connack(packet, stream, opts) + case 'publish': + return publish(packet, stream, opts) + case 'puback': + case 'pubrec': + case 'pubrel': + case 'pubcomp': + return confirmation(packet, stream, opts) + case 'subscribe': + return subscribe(packet, stream, opts) + case 'suback': + return suback(packet, stream, opts) + case 'unsubscribe': + return unsubscribe(packet, stream, opts) + case 'unsuback': + return unsuback(packet, stream, opts) + case 'pingreq': + case 'pingresp': + return emptyPacket(packet, stream, opts) + case 'disconnect': + return disconnect(packet, stream, opts) + case 'auth': + return auth(packet, stream, opts) + default: + stream.emit('error', new Error('Unknown command')) + return false + } +} +/** + * Controls numbers cache. + * Set to "false" to allocate buffers on-the-flight instead of pre-generated cache + */ +Object.defineProperty(generate, 'cacheNumbers', { + get () { + return writeNumber === writeNumberCached + }, + set (value) { + if (value) { + if (!numCache || Object.keys(numCache).length === 0) toGenerate = true + writeNumber = writeNumberCached + } else { + toGenerate = false + writeNumber = writeNumberGenerated + } + } +}) + +function uncork (stream) { + stream.uncork() +} + +function connect (packet, stream, opts) { + const settings = packet || {} + const protocolId = settings.protocolId || 'MQTT' + const protocolVersion = settings.protocolVersion || 4 + const will = settings.will + let clean = settings.clean + const keepalive = settings.keepalive || 0 + const clientId = settings.clientId || '' + const username = settings.username + const password = settings.password + /* mqtt5 new oprions */ + const properties = settings.properties + + if (clean === undefined) clean = true + + let length = 0 + + // Must be a string and non-falsy + if (!protocolId || + (typeof protocolId !== 'string' && !Buffer.isBuffer(protocolId))) { + stream.emit('error', new Error('Invalid protocolId')) + return false + } else length += protocolId.length + 2 + + // Must be 3 or 4 or 5 + if (protocolVersion !== 3 && protocolVersion !== 4 && protocolVersion !== 5) { + stream.emit('error', new Error('Invalid protocol version')) + return false + } else length += 1 + + // ClientId might be omitted in 3.1.1, but only if cleanSession is set to 1 + if ((typeof clientId === 'string' || Buffer.isBuffer(clientId)) && + (clientId || protocolVersion === 4) && (clientId || clean)) { + length += clientId.length + 2 + } else { + if (protocolVersion < 4) { + stream.emit('error', new Error('clientId must be supplied before 3.1.1')) + return false + } + if ((clean * 1) === 0) { + stream.emit('error', new Error('clientId must be given if cleanSession set to 0')) + return false + } + } + + // Must be a two byte number + if (typeof keepalive !== 'number' || + keepalive < 0 || + keepalive > 65535 || + keepalive % 1 !== 0) { + stream.emit('error', new Error('Invalid keepalive')) + return false + } else length += 2 + + // Connect flags + length += 1 + + // Properties + if (protocolVersion === 5) { + var propertiesData = getProperties(stream, properties) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // If will exists... + if (will) { + // It must be an object + if (typeof will !== 'object') { + stream.emit('error', new Error('Invalid will')) + return false + } + // It must have topic typeof string + if (!will.topic || typeof will.topic !== 'string') { + stream.emit('error', new Error('Invalid will topic')) + return false + } else { + length += Buffer.byteLength(will.topic) + 2 + } + + // Payload + length += 2 // payload length + if (will.payload) { + if (will.payload.length >= 0) { + if (typeof will.payload === 'string') { + length += Buffer.byteLength(will.payload) + } else { + length += will.payload.length + } + } else { + stream.emit('error', new Error('Invalid will payload')) + return false + } + } + // will properties + var willProperties = {} + if (protocolVersion === 5) { + willProperties = getProperties(stream, will.properties) + if (!willProperties) { return false } + length += willProperties.length + } + } + + // Username + let providedUsername = false + if (username != null) { + if (isStringOrBuffer(username)) { + providedUsername = true + length += Buffer.byteLength(username) + 2 + } else { + stream.emit('error', new Error('Invalid username')) + return false + } + } + + // Password + if (password != null) { + if (!providedUsername) { + stream.emit('error', new Error('Username is required to use password')) + return false + } + + if (isStringOrBuffer(password)) { + length += byteLength(password) + 2 + } else { + stream.emit('error', new Error('Invalid password')) + return false + } + } + + // Generate header + stream.write(protocol.CONNECT_HEADER) + + // Generate length + writeVarByteInt(stream, length) + + // Generate protocol ID + writeStringOrBuffer(stream, protocolId) + stream.write( + protocolVersion === 4 + ? protocol.VERSION4 + : protocolVersion === 5 + ? protocol.VERSION5 + : protocol.VERSION3 + ) + + // Connect flags + let flags = 0 + flags |= (username != null) ? protocol.USERNAME_MASK : 0 + flags |= (password != null) ? protocol.PASSWORD_MASK : 0 + flags |= (will && will.retain) ? protocol.WILL_RETAIN_MASK : 0 + flags |= (will && will.qos) ? will.qos << protocol.WILL_QOS_SHIFT : 0 + flags |= will ? protocol.WILL_FLAG_MASK : 0 + flags |= clean ? protocol.CLEAN_SESSION_MASK : 0 + + stream.write(Buffer.from([flags])) + + // Keepalive + writeNumber(stream, keepalive) + + // Properties + if (protocolVersion === 5) { + propertiesData.write() + } + + // Client ID + writeStringOrBuffer(stream, clientId) + + // Will + if (will) { + if (protocolVersion === 5) { + willProperties.write() + } + writeString(stream, will.topic) + writeStringOrBuffer(stream, will.payload) + } + + // Username and password + if (username != null) { + writeStringOrBuffer(stream, username) + } + if (password != null) { + writeStringOrBuffer(stream, password) + } + // This is a small packet that happens only once on a stream + // We assume the stream is always free to receive more data after this + return true +} + +function connack (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const rc = version === 5 ? settings.reasonCode : settings.returnCode + const properties = settings.properties + let length = 2 // length of rc and sessionHeader + + // Check return code + if (typeof rc !== 'number') { + stream.emit('error', new Error('Invalid return code')) + return false + } + // mqtt5 properties + let propertiesData = null + if (version === 5) { + propertiesData = getProperties(stream, properties) + if (!propertiesData) { return false } + length += propertiesData.length + } + + stream.write(protocol.CONNACK_HEADER) + // length + writeVarByteInt(stream, length) + stream.write(settings.sessionPresent ? protocol.SESSIONPRESENT_HEADER : zeroBuf) + + stream.write(Buffer.from([rc])) + if (propertiesData != null) { + propertiesData.write() + } + return true +} + +function publish (packet, stream, opts) { + debug('publish: packet: %o', packet) + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const qos = settings.qos || 0 + const retain = settings.retain ? protocol.RETAIN_MASK : 0 + const topic = settings.topic + const payload = settings.payload || empty + const id = settings.messageId + const properties = settings.properties + + let length = 0 + + // Topic must be a non-empty string or Buffer + if (typeof topic === 'string') length += Buffer.byteLength(topic) + 2 + else if (Buffer.isBuffer(topic)) length += topic.length + 2 + else { + stream.emit('error', new Error('Invalid topic')) + return false + } + + // Get the payload length + if (!Buffer.isBuffer(payload)) length += Buffer.byteLength(payload) + else length += payload.length + + // Message ID must a number if qos > 0 + if (qos && typeof id !== 'number') { + stream.emit('error', new Error('Invalid messageId')) + return false + } else if (qos) length += 2 + + // mqtt5 properties + let propertiesData = null + if (version === 5) { + propertiesData = getProperties(stream, properties) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // Header + stream.write(protocol.PUBLISH_HEADER[qos][settings.dup ? 1 : 0][retain ? 1 : 0]) + + // Remaining length + writeVarByteInt(stream, length) + + // Topic + writeNumber(stream, byteLength(topic)) + stream.write(topic) + + // Message ID + if (qos > 0) writeNumber(stream, id) + + // Properties + if (propertiesData != null) { + propertiesData.write() + } + + // Payload + debug('publish: payload: %o', payload) + return stream.write(payload) +} + +/* Puback, pubrec, pubrel and pubcomp */ +function confirmation (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const type = settings.cmd || 'puback' + const id = settings.messageId + const dup = (settings.dup && type === 'pubrel') ? protocol.DUP_MASK : 0 + let qos = 0 + const reasonCode = settings.reasonCode + const properties = settings.properties + let length = version === 5 ? 3 : 2 + + if (type === 'pubrel') qos = 1 + + // Check message ID + if (typeof id !== 'number') { + stream.emit('error', new Error('Invalid messageId')) + return false + } + + // properies mqtt 5 + let propertiesData = null + if (version === 5) { + // Confirm should not add empty property length with no properties (rfc 3.4.2.2.1) + if (typeof properties === 'object') { + propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length) + if (!propertiesData) { return false } + length += propertiesData.length + } + } + + // Header + stream.write(protocol.ACKS[type][qos][dup][0]) + + // Length + writeVarByteInt(stream, length) + + // Message ID + writeNumber(stream, id) + + // reason code in header + if (version === 5) { + stream.write(Buffer.from([reasonCode])) + } + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + return true +} + +function subscribe (packet, stream, opts) { + debug('subscribe: packet: ') + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const dup = settings.dup ? protocol.DUP_MASK : 0 + const id = settings.messageId + const subs = settings.subscriptions + const properties = settings.properties + + let length = 0 + + // Check message ID + if (typeof id !== 'number') { + stream.emit('error', new Error('Invalid messageId')) + return false + } else length += 2 + + // properies mqtt 5 + let propertiesData = null + if (version === 5) { + propertiesData = getProperties(stream, properties) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // Check subscriptions + if (typeof subs === 'object' && subs.length) { + for (let i = 0; i < subs.length; i += 1) { + const itopic = subs[i].topic + const iqos = subs[i].qos + + if (typeof itopic !== 'string') { + stream.emit('error', new Error('Invalid subscriptions - invalid topic')) + return false + } + if (typeof iqos !== 'number') { + stream.emit('error', new Error('Invalid subscriptions - invalid qos')) + return false + } + + if (version === 5) { + const nl = subs[i].nl || false + if (typeof nl !== 'boolean') { + stream.emit('error', new Error('Invalid subscriptions - invalid No Local')) + return false + } + const rap = subs[i].rap || false + if (typeof rap !== 'boolean') { + stream.emit('error', new Error('Invalid subscriptions - invalid Retain as Published')) + return false + } + const rh = subs[i].rh || 0 + if (typeof rh !== 'number' || rh > 2) { + stream.emit('error', new Error('Invalid subscriptions - invalid Retain Handling')) + return false + } + } + + length += Buffer.byteLength(itopic) + 2 + 1 + } + } else { + stream.emit('error', new Error('Invalid subscriptions')) + return false + } + + // Generate header + debug('subscribe: writing to stream: %o', protocol.SUBSCRIBE_HEADER) + stream.write(protocol.SUBSCRIBE_HEADER[1][dup ? 1 : 0][0]) + + // Generate length + writeVarByteInt(stream, length) + + // Generate message ID + writeNumber(stream, id) + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + + let result = true + + // Generate subs + for (const sub of subs) { + const jtopic = sub.topic + const jqos = sub.qos + const jnl = +sub.nl + const jrap = +sub.rap + const jrh = sub.rh + let joptions + + // Write topic string + writeString(stream, jtopic) + + // options process + joptions = protocol.SUBSCRIBE_OPTIONS_QOS[jqos] + if (version === 5) { + joptions |= jnl ? protocol.SUBSCRIBE_OPTIONS_NL : 0 + joptions |= jrap ? protocol.SUBSCRIBE_OPTIONS_RAP : 0 + joptions |= jrh ? protocol.SUBSCRIBE_OPTIONS_RH[jrh] : 0 + } + // Write options + result = stream.write(Buffer.from([joptions])) + } + + return result +} + +function suback (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const id = settings.messageId + const granted = settings.granted + const properties = settings.properties + let length = 0 + + // Check message ID + if (typeof id !== 'number') { + stream.emit('error', new Error('Invalid messageId')) + return false + } else length += 2 + + // Check granted qos vector + if (typeof granted === 'object' && granted.length) { + for (let i = 0; i < granted.length; i += 1) { + if (typeof granted[i] !== 'number') { + stream.emit('error', new Error('Invalid qos vector')) + return false + } + length += 1 + } + } else { + stream.emit('error', new Error('Invalid qos vector')) + return false + } + + // properies mqtt 5 + let propertiesData = null + if (version === 5) { + propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // header + stream.write(protocol.SUBACK_HEADER) + + // Length + writeVarByteInt(stream, length) + + // Message ID + writeNumber(stream, id) + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + + return stream.write(Buffer.from(granted)) +} + +function unsubscribe (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const id = settings.messageId + const dup = settings.dup ? protocol.DUP_MASK : 0 + const unsubs = settings.unsubscriptions + const properties = settings.properties + + let length = 0 + + // Check message ID + if (typeof id !== 'number') { + stream.emit('error', new Error('Invalid messageId')) + return false + } else { + length += 2 + } + // Check unsubs + if (typeof unsubs === 'object' && unsubs.length) { + for (let i = 0; i < unsubs.length; i += 1) { + if (typeof unsubs[i] !== 'string') { + stream.emit('error', new Error('Invalid unsubscriptions')) + return false + } + length += Buffer.byteLength(unsubs[i]) + 2 + } + } else { + stream.emit('error', new Error('Invalid unsubscriptions')) + return false + } + // properies mqtt 5 + let propertiesData = null + if (version === 5) { + propertiesData = getProperties(stream, properties) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // Header + stream.write(protocol.UNSUBSCRIBE_HEADER[1][dup ? 1 : 0][0]) + + // Length + writeVarByteInt(stream, length) + + // Message ID + writeNumber(stream, id) + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + + // Unsubs + let result = true + for (let j = 0; j < unsubs.length; j++) { + result = writeString(stream, unsubs[j]) + } + + return result +} + +function unsuback (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const id = settings.messageId + const dup = settings.dup ? protocol.DUP_MASK : 0 + const granted = settings.granted + const properties = settings.properties + const type = settings.cmd + const qos = 0 + + let length = 2 + + // Check message ID + if (typeof id !== 'number') { + stream.emit('error', new Error('Invalid messageId')) + return false + } + + // Check granted + if (version === 5) { + if (typeof granted === 'object' && granted.length) { + for (let i = 0; i < granted.length; i += 1) { + if (typeof granted[i] !== 'number') { + stream.emit('error', new Error('Invalid qos vector')) + return false + } + length += 1 + } + } else { + stream.emit('error', new Error('Invalid qos vector')) + return false + } + } + + // properies mqtt 5 + let propertiesData = null + if (version === 5) { + propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // Header + stream.write(protocol.ACKS[type][qos][dup][0]) + + // Length + writeVarByteInt(stream, length) + + // Message ID + writeNumber(stream, id) + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + + // payload + if (version === 5) { + stream.write(Buffer.from(granted)) + } + return true +} + +function emptyPacket (packet, stream, opts) { + return stream.write(protocol.EMPTY[packet.cmd]) +} + +function disconnect (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const reasonCode = settings.reasonCode + const properties = settings.properties + let length = version === 5 ? 1 : 0 + + // properies mqtt 5 + let propertiesData = null + if (version === 5) { + propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length) + if (!propertiesData) { return false } + length += propertiesData.length + } + + // Header + stream.write(Buffer.from([protocol.codes.disconnect << 4])) + + // Length + writeVarByteInt(stream, length) + + // reason code in header + if (version === 5) { + stream.write(Buffer.from([reasonCode])) + } + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + + return true +} + +function auth (packet, stream, opts) { + const version = opts ? opts.protocolVersion : 4 + const settings = packet || {} + const reasonCode = settings.reasonCode + const properties = settings.properties + let length = version === 5 ? 1 : 0 + + if (version !== 5) stream.emit('error', new Error('Invalid mqtt version for auth packet')) + + // properies mqtt 5 + const propertiesData = getPropertiesByMaximumPacketSize(stream, properties, opts, length) + if (!propertiesData) { return false } + length += propertiesData.length + + // Header + stream.write(Buffer.from([protocol.codes.auth << 4])) + + // Length + writeVarByteInt(stream, length) + + // reason code in header + stream.write(Buffer.from([reasonCode])) + + // properies mqtt 5 + if (propertiesData !== null) { + propertiesData.write() + } + return true +} + +/** + * writeVarByteInt - write an MQTT style variable byte integer to the buffer + * + * @param buffer - destination + * @param pos - offset + * @param length - length (>0) + * @returns number of bytes written + * + * @api private + */ + +const varByteIntCache = {} +function writeVarByteInt (stream, num) { + let buffer = varByteIntCache[num] + + if (!buffer) { + buffer = genBufVariableByteInt(num) + if (num < 16384) varByteIntCache[num] = buffer + } + debug('writeVarByteInt: writing to stream: %o', buffer) + stream.write(buffer) +} + +/** + * writeString - write a utf8 string to the buffer + * + * @param buffer - destination + * @param pos - offset + * @param string - string to write + * @return number of bytes written + * + * @api private + */ + +function writeString (stream, string) { + const strlen = Buffer.byteLength(string) + writeNumber(stream, strlen) + + debug('writeString: %s', string) + return stream.write(string, 'utf8') +} + +/** + * writeStringPair - write a utf8 string pairs to the buffer + * + * @param buffer - destination + * @param name - string name to write + * @param value - string value to write + * @return number of bytes written + * + * @api private + */ +function writeStringPair (stream, name, value) { + writeString(stream, name) + writeString(stream, value) +} + +/** + * writeNumber - write a two byte number to the buffer + * + * @param buffer - destination + * @param pos - offset + * @param number - number to write + * @return number of bytes written + * + * @api private + */ +function writeNumberCached (stream, number) { + debug('writeNumberCached: number: %d', number) + debug('writeNumberCached: %o', numCache[number]) + return stream.write(numCache[number]) +} +function writeNumberGenerated (stream, number) { + const generatedNumber = generateNumber(number) + debug('writeNumberGenerated: %o', generatedNumber) + return stream.write(generatedNumber) +} +function write4ByteNumber (stream, number) { + const generated4ByteBuffer = generate4ByteBuffer(number) + debug('write4ByteNumber: %o', generated4ByteBuffer) + return stream.write(generated4ByteBuffer) +} +/** + * writeStringOrBuffer - write a String or Buffer with the its length prefix + * + * @param buffer - destination + * @param pos - offset + * @param toWrite - String or Buffer + * @return number of bytes written + */ +function writeStringOrBuffer (stream, toWrite) { + if (typeof toWrite === 'string') { + writeString(stream, toWrite) + } else if (toWrite) { + writeNumber(stream, toWrite.length) + stream.write(toWrite) + } else writeNumber(stream, 0) +} + +function getProperties (stream, properties) { + /* connect properties */ + if (typeof properties !== 'object' || properties.length != null) { + return { + length: 1, + write () { + writeProperties(stream, {}, 0) + } + } + } + let propertiesLength = 0 + function getLengthProperty (name, value) { + const type = protocol.propertiesTypes[name] + let length = 0 + switch (type) { + case 'byte': { + if (typeof value !== 'boolean') { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + 1 + break + } + case 'int8': { + if (typeof value !== 'number' || value < 0 || value > 0xff) { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + 1 + break + } + case 'binary': { + if (value && value === null) { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + Buffer.byteLength(value) + 2 + break + } + case 'int16': { + if (typeof value !== 'number' || value < 0 || value > 0xffff) { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + 2 + break + } + case 'int32': { + if (typeof value !== 'number' || value < 0 || value > 0xffffffff) { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + 4 + break + } + case 'var': { + // var byte integer is max 24 bits packed in 32 bits + if (typeof value !== 'number' || value < 0 || value > 0x0fffffff) { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + Buffer.byteLength(genBufVariableByteInt(value)) + break + } + case 'string': { + if (typeof value !== 'string') { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += 1 + 2 + Buffer.byteLength(value.toString()) + break + } + case 'pair': { + if (typeof value !== 'object') { + stream.emit('error', new Error(`Invalid ${name}: ${value}`)) + return false + } + length += Object.getOwnPropertyNames(value).reduce((result, name) => { + const currentValue = value[name] + if (Array.isArray(currentValue)) { + result += currentValue.reduce((currentLength, value) => { + currentLength += 1 + 2 + Buffer.byteLength(name.toString()) + 2 + Buffer.byteLength(value.toString()) + return currentLength + }, 0) + } else { + result += 1 + 2 + Buffer.byteLength(name.toString()) + 2 + Buffer.byteLength(value[name].toString()) + } + return result + }, 0) + break + } + default: { + stream.emit('error', new Error(`Invalid property ${name}: ${value}`)) + return false + } + } + return length + } + if (properties) { + for (const propName in properties) { + let propLength = 0 + let propValueLength = 0 + const propValue = properties[propName] + if (Array.isArray(propValue)) { + for (let valueIndex = 0; valueIndex < propValue.length; valueIndex++) { + propValueLength = getLengthProperty(propName, propValue[valueIndex]) + if (!propValueLength) { return false } + propLength += propValueLength + } + } else { + propValueLength = getLengthProperty(propName, propValue) + if (!propValueLength) { return false } + propLength = propValueLength + } + if (!propLength) return false + propertiesLength += propLength + } + } + const propertiesLengthLength = Buffer.byteLength(genBufVariableByteInt(propertiesLength)) + + return { + length: propertiesLengthLength + propertiesLength, + write () { + writeProperties(stream, properties, propertiesLength) + } + } +} + +function getPropertiesByMaximumPacketSize (stream, properties, opts, length) { + const mayEmptyProps = ['reasonString', 'userProperties'] + const maximumPacketSize = opts && opts.properties && opts.properties.maximumPacketSize ? opts.properties.maximumPacketSize : 0 + + let propertiesData = getProperties(stream, properties) + if (maximumPacketSize) { + while (length + propertiesData.length > maximumPacketSize) { + const currentMayEmptyProp = mayEmptyProps.shift() + if (currentMayEmptyProp && properties[currentMayEmptyProp]) { + delete properties[currentMayEmptyProp] + propertiesData = getProperties(stream, properties) + } else { + return false + } + } + } + return propertiesData +} + +function writeProperty (stream, propName, value) { + const type = protocol.propertiesTypes[propName] + switch (type) { + case 'byte': { + stream.write(Buffer.from([protocol.properties[propName]])) + stream.write(Buffer.from([+value])) + break + } + case 'int8': { + stream.write(Buffer.from([protocol.properties[propName]])) + stream.write(Buffer.from([value])) + break + } + case 'binary': { + stream.write(Buffer.from([protocol.properties[propName]])) + writeStringOrBuffer(stream, value) + break + } + case 'int16': { + stream.write(Buffer.from([protocol.properties[propName]])) + writeNumber(stream, value) + break + } + case 'int32': { + stream.write(Buffer.from([protocol.properties[propName]])) + write4ByteNumber(stream, value) + break + } + case 'var': { + stream.write(Buffer.from([protocol.properties[propName]])) + writeVarByteInt(stream, value) + break + } + case 'string': { + stream.write(Buffer.from([protocol.properties[propName]])) + writeString(stream, value) + break + } + case 'pair': { + Object.getOwnPropertyNames(value).forEach(name => { + const currentValue = value[name] + if (Array.isArray(currentValue)) { + currentValue.forEach(value => { + stream.write(Buffer.from([protocol.properties[propName]])) + writeStringPair(stream, name.toString(), value.toString()) + }) + } else { + stream.write(Buffer.from([protocol.properties[propName]])) + writeStringPair(stream, name.toString(), currentValue.toString()) + } + }) + break + } + default: { + stream.emit('error', new Error(`Invalid property ${propName} value: ${value}`)) + return false + } + } +} + +function writeProperties (stream, properties, propertiesLength) { + /* write properties to stream */ + writeVarByteInt(stream, propertiesLength) + for (const propName in properties) { + if (Object.prototype.hasOwnProperty.call(properties, propName) && properties[propName] !== null) { + const value = properties[propName] + if (Array.isArray(value)) { + for (let valueIndex = 0; valueIndex < value.length; valueIndex++) { + writeProperty(stream, propName, value[valueIndex]) + } + } else { + writeProperty(stream, propName, value) + } + } + } +} + +function byteLength (bufOrString) { + if (!bufOrString) return 0 + else if (bufOrString instanceof Buffer) return bufOrString.length + else return Buffer.byteLength(bufOrString) +} + +function isStringOrBuffer (field) { + return typeof field === 'string' || field instanceof Buffer +} + +module.exports = generate + +}).call(this,require("buffer").Buffer) +},{"./constants":32,"./numbers":37,"buffer":12,"debug":14,"process-nextick-args":43}],41:[function(require,module,exports){ +/** + * Helpers. + */ + +var s = 1000; +var m = s * 60; +var h = m * 60; +var d = h * 24; +var w = d * 7; +var y = d * 365.25; + +/** + * Parse or format the given `val`. + * + * Options: + * + * - `long` verbose formatting [false] + * + * @param {String|Number} val + * @param {Object} [options] + * @throws {Error} throw an error if val is not a non-empty string or a number + * @return {String|Number} + * @api public + */ + +module.exports = function(val, options) { + options = options || {}; + var type = typeof val; + if (type === 'string' && val.length > 0) { + return parse(val); + } else if (type === 'number' && isFinite(val)) { + return options.long ? fmtLong(val) : fmtShort(val); + } + throw new Error( + 'val is not a non-empty string or a valid number. val=' + + JSON.stringify(val) + ); +}; + +/** + * Parse the given `str` and return milliseconds. + * + * @param {String} str + * @return {Number} + * @api private + */ + +function parse(str) { + str = String(str); + if (str.length > 100) { + return; + } + var match = /^(-?(?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|weeks?|w|years?|yrs?|y)?$/i.exec( + str + ); + if (!match) { + return; + } + var n = parseFloat(match[1]); + var type = (match[2] || 'ms').toLowerCase(); + switch (type) { + case 'years': + case 'year': + case 'yrs': + case 'yr': + case 'y': + return n * y; + case 'weeks': + case 'week': + case 'w': + return n * w; + case 'days': + case 'day': + case 'd': + return n * d; + case 'hours': + case 'hour': + case 'hrs': + case 'hr': + case 'h': + return n * h; + case 'minutes': + case 'minute': + case 'mins': + case 'min': + case 'm': + return n * m; + case 'seconds': + case 'second': + case 'secs': + case 'sec': + case 's': + return n * s; + case 'milliseconds': + case 'millisecond': + case 'msecs': + case 'msec': + case 'ms': + return n; + default: + return undefined; + } +} + +/** + * Short format for `ms`. + * + * @param {Number} ms + * @return {String} + * @api private + */ + +function fmtShort(ms) { + var msAbs = Math.abs(ms); + if (msAbs >= d) { + return Math.round(ms / d) + 'd'; + } + if (msAbs >= h) { + return Math.round(ms / h) + 'h'; + } + if (msAbs >= m) { + return Math.round(ms / m) + 'm'; + } + if (msAbs >= s) { + return Math.round(ms / s) + 's'; + } + return ms + 'ms'; +} + +/** + * Long format for `ms`. + * + * @param {Number} ms + * @return {String} + * @api private + */ + +function fmtLong(ms) { + var msAbs = Math.abs(ms); + if (msAbs >= d) { + return plural(ms, msAbs, d, 'day'); + } + if (msAbs >= h) { + return plural(ms, msAbs, h, 'hour'); + } + if (msAbs >= m) { + return plural(ms, msAbs, m, 'minute'); + } + if (msAbs >= s) { + return plural(ms, msAbs, s, 'second'); + } + return ms + ' ms'; +} + +/** + * Pluralization helper. + */ + +function plural(ms, msAbs, n, name) { + var isPlural = msAbs >= n * 1.5; + return Math.round(ms / n) + ' ' + name + (isPlural ? 's' : ''); +} + +},{}],42:[function(require,module,exports){ +var wrappy = require('wrappy') +module.exports = wrappy(once) +module.exports.strict = wrappy(onceStrict) + +once.proto = once(function () { + Object.defineProperty(Function.prototype, 'once', { + value: function () { + return once(this) + }, + configurable: true + }) + + Object.defineProperty(Function.prototype, 'onceStrict', { + value: function () { + return onceStrict(this) + }, + configurable: true + }) +}) + +function once (fn) { + var f = function () { + if (f.called) return f.value + f.called = true + return f.value = fn.apply(this, arguments) + } + f.called = false + return f +} + +function onceStrict (fn) { + var f = function () { + if (f.called) + throw new Error(f.onceError) + f.called = true + return f.value = fn.apply(this, arguments) + } + var name = fn.name || 'Function wrapped with `once`' + f.onceError = name + " shouldn't be called more than once" + f.called = false + return f +} + +},{"wrappy":66}],43:[function(require,module,exports){ +(function (process){ +'use strict'; + +if (typeof process === 'undefined' || + !process.version || + process.version.indexOf('v0.') === 0 || + process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) { + module.exports = { nextTick: nextTick }; +} else { + module.exports = process +} + +function nextTick(fn, arg1, arg2, arg3) { + if (typeof fn !== 'function') { + throw new TypeError('"callback" argument must be a function'); + } + var len = arguments.length; + var args, i; + switch (len) { + case 0: + case 1: + return process.nextTick(fn); + case 2: + return process.nextTick(function afterTickOne() { + fn.call(null, arg1); + }); + case 3: + return process.nextTick(function afterTickTwo() { + fn.call(null, arg1, arg2); + }); + case 4: + return process.nextTick(function afterTickThree() { + fn.call(null, arg1, arg2, arg3); + }); + default: + args = new Array(len - 1); + i = 0; + while (i < args.length) { + args[i++] = arguments[i]; + } + return process.nextTick(function afterTick() { + fn.apply(null, args); + }); + } +} + + +}).call(this,require('_process')) +},{"_process":44}],44:[function(require,module,exports){ +// shim for using process in browser +var process = module.exports = {}; + +// cached from whatever global is present so that test runners that stub it +// don't break things. But we need to wrap it in a try catch in case it is +// wrapped in strict mode code which doesn't define any globals. It's inside a +// function because try/catches deoptimize in certain engines. + +var cachedSetTimeout; +var cachedClearTimeout; + +function defaultSetTimout() { + throw new Error('setTimeout has not been defined'); +} +function defaultClearTimeout () { + throw new Error('clearTimeout has not been defined'); +} +(function () { + try { + if (typeof setTimeout === 'function') { + cachedSetTimeout = setTimeout; + } else { + cachedSetTimeout = defaultSetTimout; + } + } catch (e) { + cachedSetTimeout = defaultSetTimout; + } + try { + if (typeof clearTimeout === 'function') { + cachedClearTimeout = clearTimeout; + } else { + cachedClearTimeout = defaultClearTimeout; + } + } catch (e) { + cachedClearTimeout = defaultClearTimeout; + } +} ()) +function runTimeout(fun) { + if (cachedSetTimeout === setTimeout) { + //normal enviroments in sane situations + return setTimeout(fun, 0); + } + // if setTimeout wasn't available but was latter defined + if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) { + cachedSetTimeout = setTimeout; + return setTimeout(fun, 0); + } + try { + // when when somebody has screwed with setTimeout but no I.E. maddness + return cachedSetTimeout(fun, 0); + } catch(e){ + try { + // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally + return cachedSetTimeout.call(null, fun, 0); + } catch(e){ + // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error + return cachedSetTimeout.call(this, fun, 0); + } + } + + +} +function runClearTimeout(marker) { + if (cachedClearTimeout === clearTimeout) { + //normal enviroments in sane situations + return clearTimeout(marker); + } + // if clearTimeout wasn't available but was latter defined + if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) { + cachedClearTimeout = clearTimeout; + return clearTimeout(marker); + } + try { + // when when somebody has screwed with setTimeout but no I.E. maddness + return cachedClearTimeout(marker); + } catch (e){ + try { + // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally + return cachedClearTimeout.call(null, marker); + } catch (e){ + // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error. + // Some versions of I.E. have different rules for clearTimeout vs setTimeout + return cachedClearTimeout.call(this, marker); + } + } + + + +} +var queue = []; +var draining = false; +var currentQueue; +var queueIndex = -1; + +function cleanUpNextTick() { + if (!draining || !currentQueue) { + return; + } + draining = false; + if (currentQueue.length) { + queue = currentQueue.concat(queue); + } else { + queueIndex = -1; + } + if (queue.length) { + drainQueue(); + } +} + +function drainQueue() { + if (draining) { + return; + } + var timeout = runTimeout(cleanUpNextTick); + draining = true; + + var len = queue.length; + while(len) { + currentQueue = queue; + queue = []; + while (++queueIndex < len) { + if (currentQueue) { + currentQueue[queueIndex].run(); + } + } + queueIndex = -1; + len = queue.length; + } + currentQueue = null; + draining = false; + runClearTimeout(timeout); +} + +process.nextTick = function (fun) { + var args = new Array(arguments.length - 1); + if (arguments.length > 1) { + for (var i = 1; i < arguments.length; i++) { + args[i - 1] = arguments[i]; + } + } + queue.push(new Item(fun, args)); + if (queue.length === 1 && !draining) { + runTimeout(drainQueue); + } +}; + +// v8 likes predictible objects +function Item(fun, array) { + this.fun = fun; + this.array = array; +} +Item.prototype.run = function () { + this.fun.apply(null, this.array); +}; +process.title = 'browser'; +process.browser = true; +process.env = {}; +process.argv = []; +process.version = ''; // empty string to avoid regexp issues +process.versions = {}; + +function noop() {} + +process.on = noop; +process.addListener = noop; +process.once = noop; +process.off = noop; +process.removeListener = noop; +process.removeAllListeners = noop; +process.emit = noop; +process.prependListener = noop; +process.prependOnceListener = noop; + +process.listeners = function (name) { return [] } + +process.binding = function (name) { + throw new Error('process.binding is not supported'); +}; + +process.cwd = function () { return '/' }; +process.chdir = function (dir) { + throw new Error('process.chdir is not supported'); +}; +process.umask = function() { return 0; }; + +},{}],45:[function(require,module,exports){ +'use strict'; + +function _inheritsLoose(subClass, superClass) { subClass.prototype = Object.create(superClass.prototype); subClass.prototype.constructor = subClass; subClass.__proto__ = superClass; } + +var codes = {}; + +function createErrorType(code, message, Base) { + if (!Base) { + Base = Error; + } + + function getMessage(arg1, arg2, arg3) { + if (typeof message === 'string') { + return message; + } else { + return message(arg1, arg2, arg3); + } + } + + var NodeError = + /*#__PURE__*/ + function (_Base) { + _inheritsLoose(NodeError, _Base); + + function NodeError(arg1, arg2, arg3) { + return _Base.call(this, getMessage(arg1, arg2, arg3)) || this; + } + + return NodeError; + }(Base); + + NodeError.prototype.name = Base.name; + NodeError.prototype.code = code; + codes[code] = NodeError; +} // https://github.com/nodejs/node/blob/v10.8.0/lib/internal/errors.js + + +function oneOf(expected, thing) { + if (Array.isArray(expected)) { + var len = expected.length; + expected = expected.map(function (i) { + return String(i); + }); + + if (len > 2) { + return "one of ".concat(thing, " ").concat(expected.slice(0, len - 1).join(', '), ", or ") + expected[len - 1]; + } else if (len === 2) { + return "one of ".concat(thing, " ").concat(expected[0], " or ").concat(expected[1]); + } else { + return "of ".concat(thing, " ").concat(expected[0]); + } + } else { + return "of ".concat(thing, " ").concat(String(expected)); + } +} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith + + +function startsWith(str, search, pos) { + return str.substr(!pos || pos < 0 ? 0 : +pos, search.length) === search; +} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith + + +function endsWith(str, search, this_len) { + if (this_len === undefined || this_len > str.length) { + this_len = str.length; + } + + return str.substring(this_len - search.length, this_len) === search; +} // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes + + +function includes(str, search, start) { + if (typeof start !== 'number') { + start = 0; + } + + if (start + search.length > str.length) { + return false; + } else { + return str.indexOf(search, start) !== -1; + } +} + +createErrorType('ERR_INVALID_OPT_VALUE', function (name, value) { + return 'The value "' + value + '" is invalid for option "' + name + '"'; +}, TypeError); +createErrorType('ERR_INVALID_ARG_TYPE', function (name, expected, actual) { + // determiner: 'must be' or 'must not be' + var determiner; + + if (typeof expected === 'string' && startsWith(expected, 'not ')) { + determiner = 'must not be'; + expected = expected.replace(/^not /, ''); + } else { + determiner = 'must be'; + } + + var msg; + + if (endsWith(name, ' argument')) { + // For cases like 'first argument' + msg = "The ".concat(name, " ").concat(determiner, " ").concat(oneOf(expected, 'type')); + } else { + var type = includes(name, '.') ? 'property' : 'argument'; + msg = "The \"".concat(name, "\" ").concat(type, " ").concat(determiner, " ").concat(oneOf(expected, 'type')); + } + + msg += ". Received type ".concat(typeof actual); + return msg; +}, TypeError); +createErrorType('ERR_STREAM_PUSH_AFTER_EOF', 'stream.push() after EOF'); +createErrorType('ERR_METHOD_NOT_IMPLEMENTED', function (name) { + return 'The ' + name + ' method is not implemented'; +}); +createErrorType('ERR_STREAM_PREMATURE_CLOSE', 'Premature close'); +createErrorType('ERR_STREAM_DESTROYED', function (name) { + return 'Cannot call ' + name + ' after a stream was destroyed'; +}); +createErrorType('ERR_MULTIPLE_CALLBACK', 'Callback called multiple times'); +createErrorType('ERR_STREAM_CANNOT_PIPE', 'Cannot pipe, not readable'); +createErrorType('ERR_STREAM_WRITE_AFTER_END', 'write after end'); +createErrorType('ERR_STREAM_NULL_VALUES', 'May not write null values to stream', TypeError); +createErrorType('ERR_UNKNOWN_ENCODING', function (arg) { + return 'Unknown encoding: ' + arg; +}, TypeError); +createErrorType('ERR_STREAM_UNSHIFT_AFTER_END_EVENT', 'stream.unshift() after end event'); +module.exports.codes = codes; + +},{}],46:[function(require,module,exports){ +(function (process){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. +// a duplex stream is just a stream that is both readable and writable. +// Since JS doesn't have multiple prototypal inheritance, this class +// prototypally inherits from Readable, and then parasitically from +// Writable. +'use strict'; +/**/ + +var objectKeys = Object.keys || function (obj) { + var keys = []; + + for (var key in obj) { + keys.push(key); + } + + return keys; +}; +/**/ + + +module.exports = Duplex; + +var Readable = require('./_stream_readable'); + +var Writable = require('./_stream_writable'); + +require('inherits')(Duplex, Readable); + +{ + // Allow the keys array to be GC'ed. + var keys = objectKeys(Writable.prototype); + + for (var v = 0; v < keys.length; v++) { + var method = keys[v]; + if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method]; + } +} + +function Duplex(options) { + if (!(this instanceof Duplex)) return new Duplex(options); + Readable.call(this, options); + Writable.call(this, options); + this.allowHalfOpen = true; + + if (options) { + if (options.readable === false) this.readable = false; + if (options.writable === false) this.writable = false; + + if (options.allowHalfOpen === false) { + this.allowHalfOpen = false; + this.once('end', onend); + } + } +} + +Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._writableState.highWaterMark; + } +}); +Object.defineProperty(Duplex.prototype, 'writableBuffer', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._writableState && this._writableState.getBuffer(); + } +}); +Object.defineProperty(Duplex.prototype, 'writableLength', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._writableState.length; + } +}); // the no-half-open enforcer + +function onend() { + // If the writable side ended, then we're ok. + if (this._writableState.ended) return; // no more data can be written. + // But allow more writes to happen in this tick. + + process.nextTick(onEndNT, this); +} + +function onEndNT(self) { + self.end(); +} + +Object.defineProperty(Duplex.prototype, 'destroyed', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + if (this._readableState === undefined || this._writableState === undefined) { + return false; + } + + return this._readableState.destroyed && this._writableState.destroyed; + }, + set: function set(value) { + // we ignore the value if the stream + // has not been initialized yet + if (this._readableState === undefined || this._writableState === undefined) { + return; + } // backward compatibility, the user is explicitly + // managing destroyed + + + this._readableState.destroyed = value; + this._writableState.destroyed = value; + } +}); +}).call(this,require('_process')) +},{"./_stream_readable":48,"./_stream_writable":50,"_process":44,"inherits":29}],47:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. +// a passthrough stream. +// basically just the most minimal sort of Transform stream. +// Every written chunk gets output as-is. +'use strict'; + +module.exports = PassThrough; + +var Transform = require('./_stream_transform'); + +require('inherits')(PassThrough, Transform); + +function PassThrough(options) { + if (!(this instanceof PassThrough)) return new PassThrough(options); + Transform.call(this, options); +} + +PassThrough.prototype._transform = function (chunk, encoding, cb) { + cb(null, chunk); +}; +},{"./_stream_transform":49,"inherits":29}],48:[function(require,module,exports){ +(function (process,global){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. +'use strict'; + +module.exports = Readable; +/**/ + +var Duplex; +/**/ + +Readable.ReadableState = ReadableState; +/**/ + +var EE = require('events').EventEmitter; + +var EElistenerCount = function EElistenerCount(emitter, type) { + return emitter.listeners(type).length; +}; +/**/ + +/**/ + + +var Stream = require('./internal/streams/stream'); +/**/ + + +var Buffer = require('buffer').Buffer; + +var OurUint8Array = global.Uint8Array || function () {}; + +function _uint8ArrayToBuffer(chunk) { + return Buffer.from(chunk); +} + +function _isUint8Array(obj) { + return Buffer.isBuffer(obj) || obj instanceof OurUint8Array; +} +/**/ + + +var debugUtil = require('util'); + +var debug; + +if (debugUtil && debugUtil.debuglog) { + debug = debugUtil.debuglog('stream'); +} else { + debug = function debug() {}; +} +/**/ + + +var BufferList = require('./internal/streams/buffer_list'); + +var destroyImpl = require('./internal/streams/destroy'); + +var _require = require('./internal/streams/state'), + getHighWaterMark = _require.getHighWaterMark; + +var _require$codes = require('../errors').codes, + ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE, + ERR_STREAM_PUSH_AFTER_EOF = _require$codes.ERR_STREAM_PUSH_AFTER_EOF, + ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED, + ERR_STREAM_UNSHIFT_AFTER_END_EVENT = _require$codes.ERR_STREAM_UNSHIFT_AFTER_END_EVENT; // Lazy loaded to improve the startup performance. + + +var StringDecoder; +var createReadableStreamAsyncIterator; +var from; + +require('inherits')(Readable, Stream); + +var errorOrDestroy = destroyImpl.errorOrDestroy; +var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume']; + +function prependListener(emitter, event, fn) { + // Sadly this is not cacheable as some libraries bundle their own + // event emitter implementation with them. + if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn); // This is a hack to make sure that our error handler is attached before any + // userland ones. NEVER DO THIS. This is here only because this code needs + // to continue to work with older versions of Node.js that do not include + // the prependListener() method. The goal is to eventually remove this hack. + + if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (Array.isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]]; +} + +function ReadableState(options, stream, isDuplex) { + Duplex = Duplex || require('./_stream_duplex'); + options = options || {}; // Duplex streams are both readable and writable, but share + // the same options object. + // However, some cases require setting options to different + // values for the readable and the writable sides of the duplex stream. + // These options can be provided separately as readableXXX and writableXXX. + + if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag. Used to make read(n) ignore n and to + // make all the buffer merging and length checks go away + + this.objectMode = !!options.objectMode; + if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode; // the point at which it stops calling _read() to fill the buffer + // Note: 0 is a valid value, means "don't call _read preemptively ever" + + this.highWaterMark = getHighWaterMark(this, options, 'readableHighWaterMark', isDuplex); // A linked list is used to store data chunks instead of an array because the + // linked list can remove elements from the beginning faster than + // array.shift() + + this.buffer = new BufferList(); + this.length = 0; + this.pipes = null; + this.pipesCount = 0; + this.flowing = null; + this.ended = false; + this.endEmitted = false; + this.reading = false; // a flag to be able to tell if the event 'readable'/'data' is emitted + // immediately, or on a later tick. We set this to true at first, because + // any actions that shouldn't happen until "later" should generally also + // not happen before the first read call. + + this.sync = true; // whenever we return null, then we set a flag to say + // that we're awaiting a 'readable' event emission. + + this.needReadable = false; + this.emittedReadable = false; + this.readableListening = false; + this.resumeScheduled = false; + this.paused = true; // Should close be emitted on destroy. Defaults to true. + + this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'end' (and potentially 'finish') + + this.autoDestroy = !!options.autoDestroy; // has it been destroyed + + this.destroyed = false; // Crypto is kind of old and crusty. Historically, its default string + // encoding is 'binary' so we have to make this configurable. + // Everything else in the universe uses 'utf8', though. + + this.defaultEncoding = options.defaultEncoding || 'utf8'; // the number of writers that are awaiting a drain event in .pipe()s + + this.awaitDrain = 0; // if true, a maybeReadMore has been scheduled + + this.readingMore = false; + this.decoder = null; + this.encoding = null; + + if (options.encoding) { + if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder; + this.decoder = new StringDecoder(options.encoding); + this.encoding = options.encoding; + } +} + +function Readable(options) { + Duplex = Duplex || require('./_stream_duplex'); + if (!(this instanceof Readable)) return new Readable(options); // Checking for a Stream.Duplex instance is faster here instead of inside + // the ReadableState constructor, at least with V8 6.5 + + var isDuplex = this instanceof Duplex; + this._readableState = new ReadableState(options, this, isDuplex); // legacy + + this.readable = true; + + if (options) { + if (typeof options.read === 'function') this._read = options.read; + if (typeof options.destroy === 'function') this._destroy = options.destroy; + } + + Stream.call(this); +} + +Object.defineProperty(Readable.prototype, 'destroyed', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + if (this._readableState === undefined) { + return false; + } + + return this._readableState.destroyed; + }, + set: function set(value) { + // we ignore the value if the stream + // has not been initialized yet + if (!this._readableState) { + return; + } // backward compatibility, the user is explicitly + // managing destroyed + + + this._readableState.destroyed = value; + } +}); +Readable.prototype.destroy = destroyImpl.destroy; +Readable.prototype._undestroy = destroyImpl.undestroy; + +Readable.prototype._destroy = function (err, cb) { + cb(err); +}; // Manually shove something into the read() buffer. +// This returns true if the highWaterMark has not been hit yet, +// similar to how Writable.write() returns true if you should +// write() some more. + + +Readable.prototype.push = function (chunk, encoding) { + var state = this._readableState; + var skipChunkCheck; + + if (!state.objectMode) { + if (typeof chunk === 'string') { + encoding = encoding || state.defaultEncoding; + + if (encoding !== state.encoding) { + chunk = Buffer.from(chunk, encoding); + encoding = ''; + } + + skipChunkCheck = true; + } + } else { + skipChunkCheck = true; + } + + return readableAddChunk(this, chunk, encoding, false, skipChunkCheck); +}; // Unshift should *always* be something directly out of read() + + +Readable.prototype.unshift = function (chunk) { + return readableAddChunk(this, chunk, null, true, false); +}; + +function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) { + debug('readableAddChunk', chunk); + var state = stream._readableState; + + if (chunk === null) { + state.reading = false; + onEofChunk(stream, state); + } else { + var er; + if (!skipChunkCheck) er = chunkInvalid(state, chunk); + + if (er) { + errorOrDestroy(stream, er); + } else if (state.objectMode || chunk && chunk.length > 0) { + if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) { + chunk = _uint8ArrayToBuffer(chunk); + } + + if (addToFront) { + if (state.endEmitted) errorOrDestroy(stream, new ERR_STREAM_UNSHIFT_AFTER_END_EVENT());else addChunk(stream, state, chunk, true); + } else if (state.ended) { + errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF()); + } else if (state.destroyed) { + return false; + } else { + state.reading = false; + + if (state.decoder && !encoding) { + chunk = state.decoder.write(chunk); + if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state); + } else { + addChunk(stream, state, chunk, false); + } + } + } else if (!addToFront) { + state.reading = false; + maybeReadMore(stream, state); + } + } // We can push more data if we are below the highWaterMark. + // Also, if we have no data yet, we can stand some more bytes. + // This is to work around cases where hwm=0, such as the repl. + + + return !state.ended && (state.length < state.highWaterMark || state.length === 0); +} + +function addChunk(stream, state, chunk, addToFront) { + if (state.flowing && state.length === 0 && !state.sync) { + state.awaitDrain = 0; + stream.emit('data', chunk); + } else { + // update the buffer info. + state.length += state.objectMode ? 1 : chunk.length; + if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk); + if (state.needReadable) emitReadable(stream); + } + + maybeReadMore(stream, state); +} + +function chunkInvalid(state, chunk) { + var er; + + if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) { + er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer', 'Uint8Array'], chunk); + } + + return er; +} + +Readable.prototype.isPaused = function () { + return this._readableState.flowing === false; +}; // backwards compatibility. + + +Readable.prototype.setEncoding = function (enc) { + if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder; + var decoder = new StringDecoder(enc); + this._readableState.decoder = decoder; // If setEncoding(null), decoder.encoding equals utf8 + + this._readableState.encoding = this._readableState.decoder.encoding; // Iterate over current buffer to convert already stored Buffers: + + var p = this._readableState.buffer.head; + var content = ''; + + while (p !== null) { + content += decoder.write(p.data); + p = p.next; + } + + this._readableState.buffer.clear(); + + if (content !== '') this._readableState.buffer.push(content); + this._readableState.length = content.length; + return this; +}; // Don't raise the hwm > 1GB + + +var MAX_HWM = 0x40000000; + +function computeNewHighWaterMark(n) { + if (n >= MAX_HWM) { + // TODO(ronag): Throw ERR_VALUE_OUT_OF_RANGE. + n = MAX_HWM; + } else { + // Get the next highest power of 2 to prevent increasing hwm excessively in + // tiny amounts + n--; + n |= n >>> 1; + n |= n >>> 2; + n |= n >>> 4; + n |= n >>> 8; + n |= n >>> 16; + n++; + } + + return n; +} // This function is designed to be inlinable, so please take care when making +// changes to the function body. + + +function howMuchToRead(n, state) { + if (n <= 0 || state.length === 0 && state.ended) return 0; + if (state.objectMode) return 1; + + if (n !== n) { + // Only flow one buffer at a time + if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length; + } // If we're asking for more than the current hwm, then raise the hwm. + + + if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n); + if (n <= state.length) return n; // Don't have enough + + if (!state.ended) { + state.needReadable = true; + return 0; + } + + return state.length; +} // you can override either this method, or the async _read(n) below. + + +Readable.prototype.read = function (n) { + debug('read', n); + n = parseInt(n, 10); + var state = this._readableState; + var nOrig = n; + if (n !== 0) state.emittedReadable = false; // if we're doing read(0) to trigger a readable event, but we + // already have a bunch of data in the buffer, then just trigger + // the 'readable' event and move on. + + if (n === 0 && state.needReadable && ((state.highWaterMark !== 0 ? state.length >= state.highWaterMark : state.length > 0) || state.ended)) { + debug('read: emitReadable', state.length, state.ended); + if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this); + return null; + } + + n = howMuchToRead(n, state); // if we've ended, and we're now clear, then finish it up. + + if (n === 0 && state.ended) { + if (state.length === 0) endReadable(this); + return null; + } // All the actual chunk generation logic needs to be + // *below* the call to _read. The reason is that in certain + // synthetic stream cases, such as passthrough streams, _read + // may be a completely synchronous operation which may change + // the state of the read buffer, providing enough data when + // before there was *not* enough. + // + // So, the steps are: + // 1. Figure out what the state of things will be after we do + // a read from the buffer. + // + // 2. If that resulting state will trigger a _read, then call _read. + // Note that this may be asynchronous, or synchronous. Yes, it is + // deeply ugly to write APIs this way, but that still doesn't mean + // that the Readable class should behave improperly, as streams are + // designed to be sync/async agnostic. + // Take note if the _read call is sync or async (ie, if the read call + // has returned yet), so that we know whether or not it's safe to emit + // 'readable' etc. + // + // 3. Actually pull the requested chunks out of the buffer and return. + // if we need a readable event, then we need to do some reading. + + + var doRead = state.needReadable; + debug('need readable', doRead); // if we currently have less than the highWaterMark, then also read some + + if (state.length === 0 || state.length - n < state.highWaterMark) { + doRead = true; + debug('length less than watermark', doRead); + } // however, if we've ended, then there's no point, and if we're already + // reading, then it's unnecessary. + + + if (state.ended || state.reading) { + doRead = false; + debug('reading or ended', doRead); + } else if (doRead) { + debug('do read'); + state.reading = true; + state.sync = true; // if the length is currently zero, then we *need* a readable event. + + if (state.length === 0) state.needReadable = true; // call internal read method + + this._read(state.highWaterMark); + + state.sync = false; // If _read pushed data synchronously, then `reading` will be false, + // and we need to re-evaluate how much data we can return to the user. + + if (!state.reading) n = howMuchToRead(nOrig, state); + } + + var ret; + if (n > 0) ret = fromList(n, state);else ret = null; + + if (ret === null) { + state.needReadable = state.length <= state.highWaterMark; + n = 0; + } else { + state.length -= n; + state.awaitDrain = 0; + } + + if (state.length === 0) { + // If we have nothing in the buffer, then we want to know + // as soon as we *do* get something into the buffer. + if (!state.ended) state.needReadable = true; // If we tried to read() past the EOF, then emit end on the next tick. + + if (nOrig !== n && state.ended) endReadable(this); + } + + if (ret !== null) this.emit('data', ret); + return ret; +}; + +function onEofChunk(stream, state) { + debug('onEofChunk'); + if (state.ended) return; + + if (state.decoder) { + var chunk = state.decoder.end(); + + if (chunk && chunk.length) { + state.buffer.push(chunk); + state.length += state.objectMode ? 1 : chunk.length; + } + } + + state.ended = true; + + if (state.sync) { + // if we are sync, wait until next tick to emit the data. + // Otherwise we risk emitting data in the flow() + // the readable code triggers during a read() call + emitReadable(stream); + } else { + // emit 'readable' now to make sure it gets picked up. + state.needReadable = false; + + if (!state.emittedReadable) { + state.emittedReadable = true; + emitReadable_(stream); + } + } +} // Don't emit readable right away in sync mode, because this can trigger +// another read() call => stack overflow. This way, it might trigger +// a nextTick recursion warning, but that's not so bad. + + +function emitReadable(stream) { + var state = stream._readableState; + debug('emitReadable', state.needReadable, state.emittedReadable); + state.needReadable = false; + + if (!state.emittedReadable) { + debug('emitReadable', state.flowing); + state.emittedReadable = true; + process.nextTick(emitReadable_, stream); + } +} + +function emitReadable_(stream) { + var state = stream._readableState; + debug('emitReadable_', state.destroyed, state.length, state.ended); + + if (!state.destroyed && (state.length || state.ended)) { + stream.emit('readable'); + state.emittedReadable = false; + } // The stream needs another readable event if + // 1. It is not flowing, as the flow mechanism will take + // care of it. + // 2. It is not ended. + // 3. It is below the highWaterMark, so we can schedule + // another readable later. + + + state.needReadable = !state.flowing && !state.ended && state.length <= state.highWaterMark; + flow(stream); +} // at this point, the user has presumably seen the 'readable' event, +// and called read() to consume some data. that may have triggered +// in turn another _read(n) call, in which case reading = true if +// it's in progress. +// However, if we're not ended, or reading, and the length < hwm, +// then go ahead and try to read some more preemptively. + + +function maybeReadMore(stream, state) { + if (!state.readingMore) { + state.readingMore = true; + process.nextTick(maybeReadMore_, stream, state); + } +} + +function maybeReadMore_(stream, state) { + // Attempt to read more data if we should. + // + // The conditions for reading more data are (one of): + // - Not enough data buffered (state.length < state.highWaterMark). The loop + // is responsible for filling the buffer with enough data if such data + // is available. If highWaterMark is 0 and we are not in the flowing mode + // we should _not_ attempt to buffer any extra data. We'll get more data + // when the stream consumer calls read() instead. + // - No data in the buffer, and the stream is in flowing mode. In this mode + // the loop below is responsible for ensuring read() is called. Failing to + // call read here would abort the flow and there's no other mechanism for + // continuing the flow if the stream consumer has just subscribed to the + // 'data' event. + // + // In addition to the above conditions to keep reading data, the following + // conditions prevent the data from being read: + // - The stream has ended (state.ended). + // - There is already a pending 'read' operation (state.reading). This is a + // case where the the stream has called the implementation defined _read() + // method, but they are processing the call asynchronously and have _not_ + // called push() with new data. In this case we skip performing more + // read()s. The execution ends in this method again after the _read() ends + // up calling push() with more data. + while (!state.reading && !state.ended && (state.length < state.highWaterMark || state.flowing && state.length === 0)) { + var len = state.length; + debug('maybeReadMore read 0'); + stream.read(0); + if (len === state.length) // didn't get any data, stop spinning. + break; + } + + state.readingMore = false; +} // abstract method. to be overridden in specific implementation classes. +// call cb(er, data) where data is <= n in length. +// for virtual (non-string, non-buffer) streams, "length" is somewhat +// arbitrary, and perhaps not very meaningful. + + +Readable.prototype._read = function (n) { + errorOrDestroy(this, new ERR_METHOD_NOT_IMPLEMENTED('_read()')); +}; + +Readable.prototype.pipe = function (dest, pipeOpts) { + var src = this; + var state = this._readableState; + + switch (state.pipesCount) { + case 0: + state.pipes = dest; + break; + + case 1: + state.pipes = [state.pipes, dest]; + break; + + default: + state.pipes.push(dest); + break; + } + + state.pipesCount += 1; + debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts); + var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr; + var endFn = doEnd ? onend : unpipe; + if (state.endEmitted) process.nextTick(endFn);else src.once('end', endFn); + dest.on('unpipe', onunpipe); + + function onunpipe(readable, unpipeInfo) { + debug('onunpipe'); + + if (readable === src) { + if (unpipeInfo && unpipeInfo.hasUnpiped === false) { + unpipeInfo.hasUnpiped = true; + cleanup(); + } + } + } + + function onend() { + debug('onend'); + dest.end(); + } // when the dest drains, it reduces the awaitDrain counter + // on the source. This would be more elegant with a .once() + // handler in flow(), but adding and removing repeatedly is + // too slow. + + + var ondrain = pipeOnDrain(src); + dest.on('drain', ondrain); + var cleanedUp = false; + + function cleanup() { + debug('cleanup'); // cleanup event handlers once the pipe is broken + + dest.removeListener('close', onclose); + dest.removeListener('finish', onfinish); + dest.removeListener('drain', ondrain); + dest.removeListener('error', onerror); + dest.removeListener('unpipe', onunpipe); + src.removeListener('end', onend); + src.removeListener('end', unpipe); + src.removeListener('data', ondata); + cleanedUp = true; // if the reader is waiting for a drain event from this + // specific writer, then it would cause it to never start + // flowing again. + // So, if this is awaiting a drain, then we just call it now. + // If we don't know, then assume that we are waiting for one. + + if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain(); + } + + src.on('data', ondata); + + function ondata(chunk) { + debug('ondata'); + var ret = dest.write(chunk); + debug('dest.write', ret); + + if (ret === false) { + // If the user unpiped during `dest.write()`, it is possible + // to get stuck in a permanently paused state if that write + // also returned false. + // => Check whether `dest` is still a piping destination. + if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) { + debug('false write response, pause', state.awaitDrain); + state.awaitDrain++; + } + + src.pause(); + } + } // if the dest has an error, then stop piping into it. + // however, don't suppress the throwing behavior for this. + + + function onerror(er) { + debug('onerror', er); + unpipe(); + dest.removeListener('error', onerror); + if (EElistenerCount(dest, 'error') === 0) errorOrDestroy(dest, er); + } // Make sure our error handler is attached before userland ones. + + + prependListener(dest, 'error', onerror); // Both close and finish should trigger unpipe, but only once. + + function onclose() { + dest.removeListener('finish', onfinish); + unpipe(); + } + + dest.once('close', onclose); + + function onfinish() { + debug('onfinish'); + dest.removeListener('close', onclose); + unpipe(); + } + + dest.once('finish', onfinish); + + function unpipe() { + debug('unpipe'); + src.unpipe(dest); + } // tell the dest that it's being piped to + + + dest.emit('pipe', src); // start the flow if it hasn't been started already. + + if (!state.flowing) { + debug('pipe resume'); + src.resume(); + } + + return dest; +}; + +function pipeOnDrain(src) { + return function pipeOnDrainFunctionResult() { + var state = src._readableState; + debug('pipeOnDrain', state.awaitDrain); + if (state.awaitDrain) state.awaitDrain--; + + if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) { + state.flowing = true; + flow(src); + } + }; +} + +Readable.prototype.unpipe = function (dest) { + var state = this._readableState; + var unpipeInfo = { + hasUnpiped: false + }; // if we're not piping anywhere, then do nothing. + + if (state.pipesCount === 0) return this; // just one destination. most common case. + + if (state.pipesCount === 1) { + // passed in one, but it's not the right one. + if (dest && dest !== state.pipes) return this; + if (!dest) dest = state.pipes; // got a match. + + state.pipes = null; + state.pipesCount = 0; + state.flowing = false; + if (dest) dest.emit('unpipe', this, unpipeInfo); + return this; + } // slow case. multiple pipe destinations. + + + if (!dest) { + // remove all. + var dests = state.pipes; + var len = state.pipesCount; + state.pipes = null; + state.pipesCount = 0; + state.flowing = false; + + for (var i = 0; i < len; i++) { + dests[i].emit('unpipe', this, { + hasUnpiped: false + }); + } + + return this; + } // try to find the right one. + + + var index = indexOf(state.pipes, dest); + if (index === -1) return this; + state.pipes.splice(index, 1); + state.pipesCount -= 1; + if (state.pipesCount === 1) state.pipes = state.pipes[0]; + dest.emit('unpipe', this, unpipeInfo); + return this; +}; // set up data events if they are asked for +// Ensure readable listeners eventually get something + + +Readable.prototype.on = function (ev, fn) { + var res = Stream.prototype.on.call(this, ev, fn); + var state = this._readableState; + + if (ev === 'data') { + // update readableListening so that resume() may be a no-op + // a few lines down. This is needed to support once('readable'). + state.readableListening = this.listenerCount('readable') > 0; // Try start flowing on next tick if stream isn't explicitly paused + + if (state.flowing !== false) this.resume(); + } else if (ev === 'readable') { + if (!state.endEmitted && !state.readableListening) { + state.readableListening = state.needReadable = true; + state.flowing = false; + state.emittedReadable = false; + debug('on readable', state.length, state.reading); + + if (state.length) { + emitReadable(this); + } else if (!state.reading) { + process.nextTick(nReadingNextTick, this); + } + } + } + + return res; +}; + +Readable.prototype.addListener = Readable.prototype.on; + +Readable.prototype.removeListener = function (ev, fn) { + var res = Stream.prototype.removeListener.call(this, ev, fn); + + if (ev === 'readable') { + // We need to check if there is someone still listening to + // readable and reset the state. However this needs to happen + // after readable has been emitted but before I/O (nextTick) to + // support once('readable', fn) cycles. This means that calling + // resume within the same tick will have no + // effect. + process.nextTick(updateReadableListening, this); + } + + return res; +}; + +Readable.prototype.removeAllListeners = function (ev) { + var res = Stream.prototype.removeAllListeners.apply(this, arguments); + + if (ev === 'readable' || ev === undefined) { + // We need to check if there is someone still listening to + // readable and reset the state. However this needs to happen + // after readable has been emitted but before I/O (nextTick) to + // support once('readable', fn) cycles. This means that calling + // resume within the same tick will have no + // effect. + process.nextTick(updateReadableListening, this); + } + + return res; +}; + +function updateReadableListening(self) { + var state = self._readableState; + state.readableListening = self.listenerCount('readable') > 0; + + if (state.resumeScheduled && !state.paused) { + // flowing needs to be set to true now, otherwise + // the upcoming resume will not flow. + state.flowing = true; // crude way to check if we should resume + } else if (self.listenerCount('data') > 0) { + self.resume(); + } +} + +function nReadingNextTick(self) { + debug('readable nexttick read 0'); + self.read(0); +} // pause() and resume() are remnants of the legacy readable stream API +// If the user uses them, then switch into old mode. + + +Readable.prototype.resume = function () { + var state = this._readableState; + + if (!state.flowing) { + debug('resume'); // we flow only if there is no one listening + // for readable, but we still have to call + // resume() + + state.flowing = !state.readableListening; + resume(this, state); + } + + state.paused = false; + return this; +}; + +function resume(stream, state) { + if (!state.resumeScheduled) { + state.resumeScheduled = true; + process.nextTick(resume_, stream, state); + } +} + +function resume_(stream, state) { + debug('resume', state.reading); + + if (!state.reading) { + stream.read(0); + } + + state.resumeScheduled = false; + stream.emit('resume'); + flow(stream); + if (state.flowing && !state.reading) stream.read(0); +} + +Readable.prototype.pause = function () { + debug('call pause flowing=%j', this._readableState.flowing); + + if (this._readableState.flowing !== false) { + debug('pause'); + this._readableState.flowing = false; + this.emit('pause'); + } + + this._readableState.paused = true; + return this; +}; + +function flow(stream) { + var state = stream._readableState; + debug('flow', state.flowing); + + while (state.flowing && stream.read() !== null) { + ; + } +} // wrap an old-style stream as the async data source. +// This is *not* part of the readable stream interface. +// It is an ugly unfortunate mess of history. + + +Readable.prototype.wrap = function (stream) { + var _this = this; + + var state = this._readableState; + var paused = false; + stream.on('end', function () { + debug('wrapped end'); + + if (state.decoder && !state.ended) { + var chunk = state.decoder.end(); + if (chunk && chunk.length) _this.push(chunk); + } + + _this.push(null); + }); + stream.on('data', function (chunk) { + debug('wrapped data'); + if (state.decoder) chunk = state.decoder.write(chunk); // don't skip over falsy values in objectMode + + if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return; + + var ret = _this.push(chunk); + + if (!ret) { + paused = true; + stream.pause(); + } + }); // proxy all the other methods. + // important when wrapping filters and duplexes. + + for (var i in stream) { + if (this[i] === undefined && typeof stream[i] === 'function') { + this[i] = function methodWrap(method) { + return function methodWrapReturnFunction() { + return stream[method].apply(stream, arguments); + }; + }(i); + } + } // proxy certain important events. + + + for (var n = 0; n < kProxyEvents.length; n++) { + stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n])); + } // when we try to consume some more bytes, simply unpause the + // underlying stream. + + + this._read = function (n) { + debug('wrapped _read', n); + + if (paused) { + paused = false; + stream.resume(); + } + }; + + return this; +}; + +if (typeof Symbol === 'function') { + Readable.prototype[Symbol.asyncIterator] = function () { + if (createReadableStreamAsyncIterator === undefined) { + createReadableStreamAsyncIterator = require('./internal/streams/async_iterator'); + } + + return createReadableStreamAsyncIterator(this); + }; +} + +Object.defineProperty(Readable.prototype, 'readableHighWaterMark', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._readableState.highWaterMark; + } +}); +Object.defineProperty(Readable.prototype, 'readableBuffer', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._readableState && this._readableState.buffer; + } +}); +Object.defineProperty(Readable.prototype, 'readableFlowing', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._readableState.flowing; + }, + set: function set(state) { + if (this._readableState) { + this._readableState.flowing = state; + } + } +}); // exposed for testing purposes only. + +Readable._fromList = fromList; +Object.defineProperty(Readable.prototype, 'readableLength', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._readableState.length; + } +}); // Pluck off n bytes from an array of buffers. +// Length is the combined lengths of all the buffers in the list. +// This function is designed to be inlinable, so please take care when making +// changes to the function body. + +function fromList(n, state) { + // nothing buffered + if (state.length === 0) return null; + var ret; + if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) { + // read it all, truncate the list + if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.first();else ret = state.buffer.concat(state.length); + state.buffer.clear(); + } else { + // read part of list + ret = state.buffer.consume(n, state.decoder); + } + return ret; +} + +function endReadable(stream) { + var state = stream._readableState; + debug('endReadable', state.endEmitted); + + if (!state.endEmitted) { + state.ended = true; + process.nextTick(endReadableNT, state, stream); + } +} + +function endReadableNT(state, stream) { + debug('endReadableNT', state.endEmitted, state.length); // Check that we didn't get one last unshift. + + if (!state.endEmitted && state.length === 0) { + state.endEmitted = true; + stream.readable = false; + stream.emit('end'); + + if (state.autoDestroy) { + // In case of duplex streams we need a way to detect + // if the writable side is ready for autoDestroy as well + var wState = stream._writableState; + + if (!wState || wState.autoDestroy && wState.finished) { + stream.destroy(); + } + } + } +} + +if (typeof Symbol === 'function') { + Readable.from = function (iterable, opts) { + if (from === undefined) { + from = require('./internal/streams/from'); + } + + return from(Readable, iterable, opts); + }; +} + +function indexOf(xs, x) { + for (var i = 0, l = xs.length; i < l; i++) { + if (xs[i] === x) return i; + } + + return -1; +} +}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}) +},{"../errors":45,"./_stream_duplex":46,"./internal/streams/async_iterator":51,"./internal/streams/buffer_list":52,"./internal/streams/destroy":53,"./internal/streams/from":55,"./internal/streams/state":57,"./internal/streams/stream":58,"_process":44,"buffer":12,"events":27,"inherits":29,"string_decoder/":63,"util":11}],49:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. +// a transform stream is a readable/writable stream where you do +// something with the data. Sometimes it's called a "filter", +// but that's not a great name for it, since that implies a thing where +// some bits pass through, and others are simply ignored. (That would +// be a valid example of a transform, of course.) +// +// While the output is causally related to the input, it's not a +// necessarily symmetric or synchronous transformation. For example, +// a zlib stream might take multiple plain-text writes(), and then +// emit a single compressed chunk some time in the future. +// +// Here's how this works: +// +// The Transform stream has all the aspects of the readable and writable +// stream classes. When you write(chunk), that calls _write(chunk,cb) +// internally, and returns false if there's a lot of pending writes +// buffered up. When you call read(), that calls _read(n) until +// there's enough pending readable data buffered up. +// +// In a transform stream, the written data is placed in a buffer. When +// _read(n) is called, it transforms the queued up data, calling the +// buffered _write cb's as it consumes chunks. If consuming a single +// written chunk would result in multiple output chunks, then the first +// outputted bit calls the readcb, and subsequent chunks just go into +// the read buffer, and will cause it to emit 'readable' if necessary. +// +// This way, back-pressure is actually determined by the reading side, +// since _read has to be called to start processing a new chunk. However, +// a pathological inflate type of transform can cause excessive buffering +// here. For example, imagine a stream where every byte of input is +// interpreted as an integer from 0-255, and then results in that many +// bytes of output. Writing the 4 bytes {ff,ff,ff,ff} would result in +// 1kb of data being output. In this case, you could write a very small +// amount of input, and end up with a very large amount of output. In +// such a pathological inflating mechanism, there'd be no way to tell +// the system to stop doing the transform. A single 4MB write could +// cause the system to run out of memory. +// +// However, even in such a pathological case, only a single written chunk +// would be consumed, and then the rest would wait (un-transformed) until +// the results of the previous transformed chunk were consumed. +'use strict'; + +module.exports = Transform; + +var _require$codes = require('../errors').codes, + ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED, + ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK, + ERR_TRANSFORM_ALREADY_TRANSFORMING = _require$codes.ERR_TRANSFORM_ALREADY_TRANSFORMING, + ERR_TRANSFORM_WITH_LENGTH_0 = _require$codes.ERR_TRANSFORM_WITH_LENGTH_0; + +var Duplex = require('./_stream_duplex'); + +require('inherits')(Transform, Duplex); + +function afterTransform(er, data) { + var ts = this._transformState; + ts.transforming = false; + var cb = ts.writecb; + + if (cb === null) { + return this.emit('error', new ERR_MULTIPLE_CALLBACK()); + } + + ts.writechunk = null; + ts.writecb = null; + if (data != null) // single equals check for both `null` and `undefined` + this.push(data); + cb(er); + var rs = this._readableState; + rs.reading = false; + + if (rs.needReadable || rs.length < rs.highWaterMark) { + this._read(rs.highWaterMark); + } +} + +function Transform(options) { + if (!(this instanceof Transform)) return new Transform(options); + Duplex.call(this, options); + this._transformState = { + afterTransform: afterTransform.bind(this), + needTransform: false, + transforming: false, + writecb: null, + writechunk: null, + writeencoding: null + }; // start out asking for a readable event once data is transformed. + + this._readableState.needReadable = true; // we have implemented the _read method, and done the other things + // that Readable wants before the first _read call, so unset the + // sync guard flag. + + this._readableState.sync = false; + + if (options) { + if (typeof options.transform === 'function') this._transform = options.transform; + if (typeof options.flush === 'function') this._flush = options.flush; + } // When the writable side finishes, then flush out anything remaining. + + + this.on('prefinish', prefinish); +} + +function prefinish() { + var _this = this; + + if (typeof this._flush === 'function' && !this._readableState.destroyed) { + this._flush(function (er, data) { + done(_this, er, data); + }); + } else { + done(this, null, null); + } +} + +Transform.prototype.push = function (chunk, encoding) { + this._transformState.needTransform = false; + return Duplex.prototype.push.call(this, chunk, encoding); +}; // This is the part where you do stuff! +// override this function in implementation classes. +// 'chunk' is an input chunk. +// +// Call `push(newChunk)` to pass along transformed output +// to the readable side. You may call 'push' zero or more times. +// +// Call `cb(err)` when you are done with this chunk. If you pass +// an error, then that'll put the hurt on the whole operation. If you +// never call cb(), then you'll never get another chunk. + + +Transform.prototype._transform = function (chunk, encoding, cb) { + cb(new ERR_METHOD_NOT_IMPLEMENTED('_transform()')); +}; + +Transform.prototype._write = function (chunk, encoding, cb) { + var ts = this._transformState; + ts.writecb = cb; + ts.writechunk = chunk; + ts.writeencoding = encoding; + + if (!ts.transforming) { + var rs = this._readableState; + if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark); + } +}; // Doesn't matter what the args are here. +// _transform does all the work. +// That we got here means that the readable side wants more data. + + +Transform.prototype._read = function (n) { + var ts = this._transformState; + + if (ts.writechunk !== null && !ts.transforming) { + ts.transforming = true; + + this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform); + } else { + // mark that we need a transform, so that any data that comes in + // will get processed, now that we've asked for it. + ts.needTransform = true; + } +}; + +Transform.prototype._destroy = function (err, cb) { + Duplex.prototype._destroy.call(this, err, function (err2) { + cb(err2); + }); +}; + +function done(stream, er, data) { + if (er) return stream.emit('error', er); + if (data != null) // single equals check for both `null` and `undefined` + stream.push(data); // TODO(BridgeAR): Write a test for these two error cases + // if there's nothing in the write buffer, then that means + // that nothing more will ever be provided + + if (stream._writableState.length) throw new ERR_TRANSFORM_WITH_LENGTH_0(); + if (stream._transformState.transforming) throw new ERR_TRANSFORM_ALREADY_TRANSFORMING(); + return stream.push(null); +} +},{"../errors":45,"./_stream_duplex":46,"inherits":29}],50:[function(require,module,exports){ +(function (process,global){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. +// A bit simpler than readable streams. +// Implement an async ._write(chunk, encoding, cb), and it'll handle all +// the drain event emission and buffering. +'use strict'; + +module.exports = Writable; +/* */ + +function WriteReq(chunk, encoding, cb) { + this.chunk = chunk; + this.encoding = encoding; + this.callback = cb; + this.next = null; +} // It seems a linked list but it is not +// there will be only 2 of these for each stream + + +function CorkedRequest(state) { + var _this = this; + + this.next = null; + this.entry = null; + + this.finish = function () { + onCorkedFinish(_this, state); + }; +} +/* */ + +/**/ + + +var Duplex; +/**/ + +Writable.WritableState = WritableState; +/**/ + +var internalUtil = { + deprecate: require('util-deprecate') +}; +/**/ + +/**/ + +var Stream = require('./internal/streams/stream'); +/**/ + + +var Buffer = require('buffer').Buffer; + +var OurUint8Array = global.Uint8Array || function () {}; + +function _uint8ArrayToBuffer(chunk) { + return Buffer.from(chunk); +} + +function _isUint8Array(obj) { + return Buffer.isBuffer(obj) || obj instanceof OurUint8Array; +} + +var destroyImpl = require('./internal/streams/destroy'); + +var _require = require('./internal/streams/state'), + getHighWaterMark = _require.getHighWaterMark; + +var _require$codes = require('../errors').codes, + ERR_INVALID_ARG_TYPE = _require$codes.ERR_INVALID_ARG_TYPE, + ERR_METHOD_NOT_IMPLEMENTED = _require$codes.ERR_METHOD_NOT_IMPLEMENTED, + ERR_MULTIPLE_CALLBACK = _require$codes.ERR_MULTIPLE_CALLBACK, + ERR_STREAM_CANNOT_PIPE = _require$codes.ERR_STREAM_CANNOT_PIPE, + ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED, + ERR_STREAM_NULL_VALUES = _require$codes.ERR_STREAM_NULL_VALUES, + ERR_STREAM_WRITE_AFTER_END = _require$codes.ERR_STREAM_WRITE_AFTER_END, + ERR_UNKNOWN_ENCODING = _require$codes.ERR_UNKNOWN_ENCODING; + +var errorOrDestroy = destroyImpl.errorOrDestroy; + +require('inherits')(Writable, Stream); + +function nop() {} + +function WritableState(options, stream, isDuplex) { + Duplex = Duplex || require('./_stream_duplex'); + options = options || {}; // Duplex streams are both readable and writable, but share + // the same options object. + // However, some cases require setting options to different + // values for the readable and the writable sides of the duplex stream, + // e.g. options.readableObjectMode vs. options.writableObjectMode, etc. + + if (typeof isDuplex !== 'boolean') isDuplex = stream instanceof Duplex; // object stream flag to indicate whether or not this stream + // contains buffers or objects. + + this.objectMode = !!options.objectMode; + if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode; // the point at which write() starts returning false + // Note: 0 is a valid value, means that we always return false if + // the entire buffer is not flushed immediately on write() + + this.highWaterMark = getHighWaterMark(this, options, 'writableHighWaterMark', isDuplex); // if _final has been called + + this.finalCalled = false; // drain event flag. + + this.needDrain = false; // at the start of calling end() + + this.ending = false; // when end() has been called, and returned + + this.ended = false; // when 'finish' is emitted + + this.finished = false; // has it been destroyed + + this.destroyed = false; // should we decode strings into buffers before passing to _write? + // this is here so that some node-core streams can optimize string + // handling at a lower level. + + var noDecode = options.decodeStrings === false; + this.decodeStrings = !noDecode; // Crypto is kind of old and crusty. Historically, its default string + // encoding is 'binary' so we have to make this configurable. + // Everything else in the universe uses 'utf8', though. + + this.defaultEncoding = options.defaultEncoding || 'utf8'; // not an actual buffer we keep track of, but a measurement + // of how much we're waiting to get pushed to some underlying + // socket or file. + + this.length = 0; // a flag to see when we're in the middle of a write. + + this.writing = false; // when true all writes will be buffered until .uncork() call + + this.corked = 0; // a flag to be able to tell if the onwrite cb is called immediately, + // or on a later tick. We set this to true at first, because any + // actions that shouldn't happen until "later" should generally also + // not happen before the first write call. + + this.sync = true; // a flag to know if we're processing previously buffered items, which + // may call the _write() callback in the same tick, so that we don't + // end up in an overlapped onwrite situation. + + this.bufferProcessing = false; // the callback that's passed to _write(chunk,cb) + + this.onwrite = function (er) { + onwrite(stream, er); + }; // the callback that the user supplies to write(chunk,encoding,cb) + + + this.writecb = null; // the amount that is being written when _write is called. + + this.writelen = 0; + this.bufferedRequest = null; + this.lastBufferedRequest = null; // number of pending user-supplied write callbacks + // this must be 0 before 'finish' can be emitted + + this.pendingcb = 0; // emit prefinish if the only thing we're waiting for is _write cbs + // This is relevant for synchronous Transform streams + + this.prefinished = false; // True if the error was already emitted and should not be thrown again + + this.errorEmitted = false; // Should close be emitted on destroy. Defaults to true. + + this.emitClose = options.emitClose !== false; // Should .destroy() be called after 'finish' (and potentially 'end') + + this.autoDestroy = !!options.autoDestroy; // count buffered requests + + this.bufferedRequestCount = 0; // allocate the first CorkedRequest, there is always + // one allocated and free to use, and we maintain at most two + + this.corkedRequestsFree = new CorkedRequest(this); +} + +WritableState.prototype.getBuffer = function getBuffer() { + var current = this.bufferedRequest; + var out = []; + + while (current) { + out.push(current); + current = current.next; + } + + return out; +}; + +(function () { + try { + Object.defineProperty(WritableState.prototype, 'buffer', { + get: internalUtil.deprecate(function writableStateBufferGetter() { + return this.getBuffer(); + }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003') + }); + } catch (_) {} +})(); // Test _writableState for inheritance to account for Duplex streams, +// whose prototype chain only points to Readable. + + +var realHasInstance; + +if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') { + realHasInstance = Function.prototype[Symbol.hasInstance]; + Object.defineProperty(Writable, Symbol.hasInstance, { + value: function value(object) { + if (realHasInstance.call(this, object)) return true; + if (this !== Writable) return false; + return object && object._writableState instanceof WritableState; + } + }); +} else { + realHasInstance = function realHasInstance(object) { + return object instanceof this; + }; +} + +function Writable(options) { + Duplex = Duplex || require('./_stream_duplex'); // Writable ctor is applied to Duplexes, too. + // `realHasInstance` is necessary because using plain `instanceof` + // would return false, as no `_writableState` property is attached. + // Trying to use the custom `instanceof` for Writable here will also break the + // Node.js LazyTransform implementation, which has a non-trivial getter for + // `_writableState` that would lead to infinite recursion. + // Checking for a Stream.Duplex instance is faster here instead of inside + // the WritableState constructor, at least with V8 6.5 + + var isDuplex = this instanceof Duplex; + if (!isDuplex && !realHasInstance.call(Writable, this)) return new Writable(options); + this._writableState = new WritableState(options, this, isDuplex); // legacy. + + this.writable = true; + + if (options) { + if (typeof options.write === 'function') this._write = options.write; + if (typeof options.writev === 'function') this._writev = options.writev; + if (typeof options.destroy === 'function') this._destroy = options.destroy; + if (typeof options.final === 'function') this._final = options.final; + } + + Stream.call(this); +} // Otherwise people can pipe Writable streams, which is just wrong. + + +Writable.prototype.pipe = function () { + errorOrDestroy(this, new ERR_STREAM_CANNOT_PIPE()); +}; + +function writeAfterEnd(stream, cb) { + var er = new ERR_STREAM_WRITE_AFTER_END(); // TODO: defer error events consistently everywhere, not just the cb + + errorOrDestroy(stream, er); + process.nextTick(cb, er); +} // Checks that a user-supplied chunk is valid, especially for the particular +// mode the stream is in. Currently this means that `null` is never accepted +// and undefined/non-string values are only allowed in object mode. + + +function validChunk(stream, state, chunk, cb) { + var er; + + if (chunk === null) { + er = new ERR_STREAM_NULL_VALUES(); + } else if (typeof chunk !== 'string' && !state.objectMode) { + er = new ERR_INVALID_ARG_TYPE('chunk', ['string', 'Buffer'], chunk); + } + + if (er) { + errorOrDestroy(stream, er); + process.nextTick(cb, er); + return false; + } + + return true; +} + +Writable.prototype.write = function (chunk, encoding, cb) { + var state = this._writableState; + var ret = false; + + var isBuf = !state.objectMode && _isUint8Array(chunk); + + if (isBuf && !Buffer.isBuffer(chunk)) { + chunk = _uint8ArrayToBuffer(chunk); + } + + if (typeof encoding === 'function') { + cb = encoding; + encoding = null; + } + + if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding; + if (typeof cb !== 'function') cb = nop; + if (state.ending) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) { + state.pendingcb++; + ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb); + } + return ret; +}; + +Writable.prototype.cork = function () { + this._writableState.corked++; +}; + +Writable.prototype.uncork = function () { + var state = this._writableState; + + if (state.corked) { + state.corked--; + if (!state.writing && !state.corked && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state); + } +}; + +Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) { + // node::ParseEncoding() requires lower case. + if (typeof encoding === 'string') encoding = encoding.toLowerCase(); + if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new ERR_UNKNOWN_ENCODING(encoding); + this._writableState.defaultEncoding = encoding; + return this; +}; + +Object.defineProperty(Writable.prototype, 'writableBuffer', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._writableState && this._writableState.getBuffer(); + } +}); + +function decodeChunk(state, chunk, encoding) { + if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') { + chunk = Buffer.from(chunk, encoding); + } + + return chunk; +} + +Object.defineProperty(Writable.prototype, 'writableHighWaterMark', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._writableState.highWaterMark; + } +}); // if we're already writing something, then just put this +// in the queue, and wait our turn. Otherwise, call _write +// If we return false, then we need a drain event, so set that flag. + +function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) { + if (!isBuf) { + var newChunk = decodeChunk(state, chunk, encoding); + + if (chunk !== newChunk) { + isBuf = true; + encoding = 'buffer'; + chunk = newChunk; + } + } + + var len = state.objectMode ? 1 : chunk.length; + state.length += len; + var ret = state.length < state.highWaterMark; // we must ensure that previous needDrain will not be reset to false. + + if (!ret) state.needDrain = true; + + if (state.writing || state.corked) { + var last = state.lastBufferedRequest; + state.lastBufferedRequest = { + chunk: chunk, + encoding: encoding, + isBuf: isBuf, + callback: cb, + next: null + }; + + if (last) { + last.next = state.lastBufferedRequest; + } else { + state.bufferedRequest = state.lastBufferedRequest; + } + + state.bufferedRequestCount += 1; + } else { + doWrite(stream, state, false, len, chunk, encoding, cb); + } + + return ret; +} + +function doWrite(stream, state, writev, len, chunk, encoding, cb) { + state.writelen = len; + state.writecb = cb; + state.writing = true; + state.sync = true; + if (state.destroyed) state.onwrite(new ERR_STREAM_DESTROYED('write'));else if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite); + state.sync = false; +} + +function onwriteError(stream, state, sync, er, cb) { + --state.pendingcb; + + if (sync) { + // defer the callback if we are being called synchronously + // to avoid piling up things on the stack + process.nextTick(cb, er); // this can emit finish, and it will always happen + // after error + + process.nextTick(finishMaybe, stream, state); + stream._writableState.errorEmitted = true; + errorOrDestroy(stream, er); + } else { + // the caller expect this to happen before if + // it is async + cb(er); + stream._writableState.errorEmitted = true; + errorOrDestroy(stream, er); // this can emit finish, but finish must + // always follow error + + finishMaybe(stream, state); + } +} + +function onwriteStateUpdate(state) { + state.writing = false; + state.writecb = null; + state.length -= state.writelen; + state.writelen = 0; +} + +function onwrite(stream, er) { + var state = stream._writableState; + var sync = state.sync; + var cb = state.writecb; + if (typeof cb !== 'function') throw new ERR_MULTIPLE_CALLBACK(); + onwriteStateUpdate(state); + if (er) onwriteError(stream, state, sync, er, cb);else { + // Check if we're actually ready to finish, but don't emit yet + var finished = needFinish(state) || stream.destroyed; + + if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) { + clearBuffer(stream, state); + } + + if (sync) { + process.nextTick(afterWrite, stream, state, finished, cb); + } else { + afterWrite(stream, state, finished, cb); + } + } +} + +function afterWrite(stream, state, finished, cb) { + if (!finished) onwriteDrain(stream, state); + state.pendingcb--; + cb(); + finishMaybe(stream, state); +} // Must force callback to be called on nextTick, so that we don't +// emit 'drain' before the write() consumer gets the 'false' return +// value, and has a chance to attach a 'drain' listener. + + +function onwriteDrain(stream, state) { + if (state.length === 0 && state.needDrain) { + state.needDrain = false; + stream.emit('drain'); + } +} // if there's something in the buffer waiting, then process it + + +function clearBuffer(stream, state) { + state.bufferProcessing = true; + var entry = state.bufferedRequest; + + if (stream._writev && entry && entry.next) { + // Fast case, write everything using _writev() + var l = state.bufferedRequestCount; + var buffer = new Array(l); + var holder = state.corkedRequestsFree; + holder.entry = entry; + var count = 0; + var allBuffers = true; + + while (entry) { + buffer[count] = entry; + if (!entry.isBuf) allBuffers = false; + entry = entry.next; + count += 1; + } + + buffer.allBuffers = allBuffers; + doWrite(stream, state, true, state.length, buffer, '', holder.finish); // doWrite is almost always async, defer these to save a bit of time + // as the hot path ends with doWrite + + state.pendingcb++; + state.lastBufferedRequest = null; + + if (holder.next) { + state.corkedRequestsFree = holder.next; + holder.next = null; + } else { + state.corkedRequestsFree = new CorkedRequest(state); + } + + state.bufferedRequestCount = 0; + } else { + // Slow case, write chunks one-by-one + while (entry) { + var chunk = entry.chunk; + var encoding = entry.encoding; + var cb = entry.callback; + var len = state.objectMode ? 1 : chunk.length; + doWrite(stream, state, false, len, chunk, encoding, cb); + entry = entry.next; + state.bufferedRequestCount--; // if we didn't call the onwrite immediately, then + // it means that we need to wait until it does. + // also, that means that the chunk and cb are currently + // being processed, so move the buffer counter past them. + + if (state.writing) { + break; + } + } + + if (entry === null) state.lastBufferedRequest = null; + } + + state.bufferedRequest = entry; + state.bufferProcessing = false; +} + +Writable.prototype._write = function (chunk, encoding, cb) { + cb(new ERR_METHOD_NOT_IMPLEMENTED('_write()')); +}; + +Writable.prototype._writev = null; + +Writable.prototype.end = function (chunk, encoding, cb) { + var state = this._writableState; + + if (typeof chunk === 'function') { + cb = chunk; + chunk = null; + encoding = null; + } else if (typeof encoding === 'function') { + cb = encoding; + encoding = null; + } + + if (chunk !== null && chunk !== undefined) this.write(chunk, encoding); // .end() fully uncorks + + if (state.corked) { + state.corked = 1; + this.uncork(); + } // ignore unnecessary end() calls. + + + if (!state.ending) endWritable(this, state, cb); + return this; +}; + +Object.defineProperty(Writable.prototype, 'writableLength', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + return this._writableState.length; + } +}); + +function needFinish(state) { + return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing; +} + +function callFinal(stream, state) { + stream._final(function (err) { + state.pendingcb--; + + if (err) { + errorOrDestroy(stream, err); + } + + state.prefinished = true; + stream.emit('prefinish'); + finishMaybe(stream, state); + }); +} + +function prefinish(stream, state) { + if (!state.prefinished && !state.finalCalled) { + if (typeof stream._final === 'function' && !state.destroyed) { + state.pendingcb++; + state.finalCalled = true; + process.nextTick(callFinal, stream, state); + } else { + state.prefinished = true; + stream.emit('prefinish'); + } + } +} + +function finishMaybe(stream, state) { + var need = needFinish(state); + + if (need) { + prefinish(stream, state); + + if (state.pendingcb === 0) { + state.finished = true; + stream.emit('finish'); + + if (state.autoDestroy) { + // In case of duplex streams we need a way to detect + // if the readable side is ready for autoDestroy as well + var rState = stream._readableState; + + if (!rState || rState.autoDestroy && rState.endEmitted) { + stream.destroy(); + } + } + } + } + + return need; +} + +function endWritable(stream, state, cb) { + state.ending = true; + finishMaybe(stream, state); + + if (cb) { + if (state.finished) process.nextTick(cb);else stream.once('finish', cb); + } + + state.ended = true; + stream.writable = false; +} + +function onCorkedFinish(corkReq, state, err) { + var entry = corkReq.entry; + corkReq.entry = null; + + while (entry) { + var cb = entry.callback; + state.pendingcb--; + cb(err); + entry = entry.next; + } // reuse the free corkReq. + + + state.corkedRequestsFree.next = corkReq; +} + +Object.defineProperty(Writable.prototype, 'destroyed', { + // making it explicit this property is not enumerable + // because otherwise some prototype manipulation in + // userland will fail + enumerable: false, + get: function get() { + if (this._writableState === undefined) { + return false; + } + + return this._writableState.destroyed; + }, + set: function set(value) { + // we ignore the value if the stream + // has not been initialized yet + if (!this._writableState) { + return; + } // backward compatibility, the user is explicitly + // managing destroyed + + + this._writableState.destroyed = value; + } +}); +Writable.prototype.destroy = destroyImpl.destroy; +Writable.prototype._undestroy = destroyImpl.undestroy; + +Writable.prototype._destroy = function (err, cb) { + cb(err); +}; +}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}) +},{"../errors":45,"./_stream_duplex":46,"./internal/streams/destroy":53,"./internal/streams/state":57,"./internal/streams/stream":58,"_process":44,"buffer":12,"inherits":29,"util-deprecate":65}],51:[function(require,module,exports){ +(function (process){ +'use strict'; + +var _Object$setPrototypeO; + +function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } + +var finished = require('./end-of-stream'); + +var kLastResolve = Symbol('lastResolve'); +var kLastReject = Symbol('lastReject'); +var kError = Symbol('error'); +var kEnded = Symbol('ended'); +var kLastPromise = Symbol('lastPromise'); +var kHandlePromise = Symbol('handlePromise'); +var kStream = Symbol('stream'); + +function createIterResult(value, done) { + return { + value: value, + done: done + }; +} + +function readAndResolve(iter) { + var resolve = iter[kLastResolve]; + + if (resolve !== null) { + var data = iter[kStream].read(); // we defer if data is null + // we can be expecting either 'end' or + // 'error' + + if (data !== null) { + iter[kLastPromise] = null; + iter[kLastResolve] = null; + iter[kLastReject] = null; + resolve(createIterResult(data, false)); + } + } +} + +function onReadable(iter) { + // we wait for the next tick, because it might + // emit an error with process.nextTick + process.nextTick(readAndResolve, iter); +} + +function wrapForNext(lastPromise, iter) { + return function (resolve, reject) { + lastPromise.then(function () { + if (iter[kEnded]) { + resolve(createIterResult(undefined, true)); + return; + } + + iter[kHandlePromise](resolve, reject); + }, reject); + }; +} + +var AsyncIteratorPrototype = Object.getPrototypeOf(function () {}); +var ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf((_Object$setPrototypeO = { + get stream() { + return this[kStream]; + }, + + next: function next() { + var _this = this; + + // if we have detected an error in the meanwhile + // reject straight away + var error = this[kError]; + + if (error !== null) { + return Promise.reject(error); + } + + if (this[kEnded]) { + return Promise.resolve(createIterResult(undefined, true)); + } + + if (this[kStream].destroyed) { + // We need to defer via nextTick because if .destroy(err) is + // called, the error will be emitted via nextTick, and + // we cannot guarantee that there is no error lingering around + // waiting to be emitted. + return new Promise(function (resolve, reject) { + process.nextTick(function () { + if (_this[kError]) { + reject(_this[kError]); + } else { + resolve(createIterResult(undefined, true)); + } + }); + }); + } // if we have multiple next() calls + // we will wait for the previous Promise to finish + // this logic is optimized to support for await loops, + // where next() is only called once at a time + + + var lastPromise = this[kLastPromise]; + var promise; + + if (lastPromise) { + promise = new Promise(wrapForNext(lastPromise, this)); + } else { + // fast path needed to support multiple this.push() + // without triggering the next() queue + var data = this[kStream].read(); + + if (data !== null) { + return Promise.resolve(createIterResult(data, false)); + } + + promise = new Promise(this[kHandlePromise]); + } + + this[kLastPromise] = promise; + return promise; + } +}, _defineProperty(_Object$setPrototypeO, Symbol.asyncIterator, function () { + return this; +}), _defineProperty(_Object$setPrototypeO, "return", function _return() { + var _this2 = this; + + // destroy(err, cb) is a private API + // we can guarantee we have that here, because we control the + // Readable class this is attached to + return new Promise(function (resolve, reject) { + _this2[kStream].destroy(null, function (err) { + if (err) { + reject(err); + return; + } + + resolve(createIterResult(undefined, true)); + }); + }); +}), _Object$setPrototypeO), AsyncIteratorPrototype); + +var createReadableStreamAsyncIterator = function createReadableStreamAsyncIterator(stream) { + var _Object$create; + + var iterator = Object.create(ReadableStreamAsyncIteratorPrototype, (_Object$create = {}, _defineProperty(_Object$create, kStream, { + value: stream, + writable: true + }), _defineProperty(_Object$create, kLastResolve, { + value: null, + writable: true + }), _defineProperty(_Object$create, kLastReject, { + value: null, + writable: true + }), _defineProperty(_Object$create, kError, { + value: null, + writable: true + }), _defineProperty(_Object$create, kEnded, { + value: stream._readableState.endEmitted, + writable: true + }), _defineProperty(_Object$create, kHandlePromise, { + value: function value(resolve, reject) { + var data = iterator[kStream].read(); + + if (data) { + iterator[kLastPromise] = null; + iterator[kLastResolve] = null; + iterator[kLastReject] = null; + resolve(createIterResult(data, false)); + } else { + iterator[kLastResolve] = resolve; + iterator[kLastReject] = reject; + } + }, + writable: true + }), _Object$create)); + iterator[kLastPromise] = null; + finished(stream, function (err) { + if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') { + var reject = iterator[kLastReject]; // reject if we are waiting for data in the Promise + // returned by next() and store the error + + if (reject !== null) { + iterator[kLastPromise] = null; + iterator[kLastResolve] = null; + iterator[kLastReject] = null; + reject(err); + } + + iterator[kError] = err; + return; + } + + var resolve = iterator[kLastResolve]; + + if (resolve !== null) { + iterator[kLastPromise] = null; + iterator[kLastResolve] = null; + iterator[kLastReject] = null; + resolve(createIterResult(undefined, true)); + } + + iterator[kEnded] = true; + }); + stream.on('readable', onReadable.bind(null, iterator)); + return iterator; +}; + +module.exports = createReadableStreamAsyncIterator; +}).call(this,require('_process')) +},{"./end-of-stream":54,"_process":44}],52:[function(require,module,exports){ +'use strict'; + +function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; } + +function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; } + +function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } + +function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } + +function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } + +function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; } + +var _require = require('buffer'), + Buffer = _require.Buffer; + +var _require2 = require('util'), + inspect = _require2.inspect; + +var custom = inspect && inspect.custom || 'inspect'; + +function copyBuffer(src, target, offset) { + Buffer.prototype.copy.call(src, target, offset); +} + +module.exports = +/*#__PURE__*/ +function () { + function BufferList() { + _classCallCheck(this, BufferList); + + this.head = null; + this.tail = null; + this.length = 0; + } + + _createClass(BufferList, [{ + key: "push", + value: function push(v) { + var entry = { + data: v, + next: null + }; + if (this.length > 0) this.tail.next = entry;else this.head = entry; + this.tail = entry; + ++this.length; + } + }, { + key: "unshift", + value: function unshift(v) { + var entry = { + data: v, + next: this.head + }; + if (this.length === 0) this.tail = entry; + this.head = entry; + ++this.length; + } + }, { + key: "shift", + value: function shift() { + if (this.length === 0) return; + var ret = this.head.data; + if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next; + --this.length; + return ret; + } + }, { + key: "clear", + value: function clear() { + this.head = this.tail = null; + this.length = 0; + } + }, { + key: "join", + value: function join(s) { + if (this.length === 0) return ''; + var p = this.head; + var ret = '' + p.data; + + while (p = p.next) { + ret += s + p.data; + } + + return ret; + } + }, { + key: "concat", + value: function concat(n) { + if (this.length === 0) return Buffer.alloc(0); + var ret = Buffer.allocUnsafe(n >>> 0); + var p = this.head; + var i = 0; + + while (p) { + copyBuffer(p.data, ret, i); + i += p.data.length; + p = p.next; + } + + return ret; + } // Consumes a specified amount of bytes or characters from the buffered data. + + }, { + key: "consume", + value: function consume(n, hasStrings) { + var ret; + + if (n < this.head.data.length) { + // `slice` is the same for buffers and strings. + ret = this.head.data.slice(0, n); + this.head.data = this.head.data.slice(n); + } else if (n === this.head.data.length) { + // First chunk is a perfect match. + ret = this.shift(); + } else { + // Result spans more than one buffer. + ret = hasStrings ? this._getString(n) : this._getBuffer(n); + } + + return ret; + } + }, { + key: "first", + value: function first() { + return this.head.data; + } // Consumes a specified amount of characters from the buffered data. + + }, { + key: "_getString", + value: function _getString(n) { + var p = this.head; + var c = 1; + var ret = p.data; + n -= ret.length; + + while (p = p.next) { + var str = p.data; + var nb = n > str.length ? str.length : n; + if (nb === str.length) ret += str;else ret += str.slice(0, n); + n -= nb; + + if (n === 0) { + if (nb === str.length) { + ++c; + if (p.next) this.head = p.next;else this.head = this.tail = null; + } else { + this.head = p; + p.data = str.slice(nb); + } + + break; + } + + ++c; + } + + this.length -= c; + return ret; + } // Consumes a specified amount of bytes from the buffered data. + + }, { + key: "_getBuffer", + value: function _getBuffer(n) { + var ret = Buffer.allocUnsafe(n); + var p = this.head; + var c = 1; + p.data.copy(ret); + n -= p.data.length; + + while (p = p.next) { + var buf = p.data; + var nb = n > buf.length ? buf.length : n; + buf.copy(ret, ret.length - n, 0, nb); + n -= nb; + + if (n === 0) { + if (nb === buf.length) { + ++c; + if (p.next) this.head = p.next;else this.head = this.tail = null; + } else { + this.head = p; + p.data = buf.slice(nb); + } + + break; + } + + ++c; + } + + this.length -= c; + return ret; + } // Make sure the linked list only shows the minimal necessary information. + + }, { + key: custom, + value: function value(_, options) { + return inspect(this, _objectSpread({}, options, { + // Only inspect one level. + depth: 0, + // It should not recurse. + customInspect: false + })); + } + }]); + + return BufferList; +}(); +},{"buffer":12,"util":11}],53:[function(require,module,exports){ +(function (process){ +'use strict'; // undocumented cb() API, needed for core, not for public API + +function destroy(err, cb) { + var _this = this; + + var readableDestroyed = this._readableState && this._readableState.destroyed; + var writableDestroyed = this._writableState && this._writableState.destroyed; + + if (readableDestroyed || writableDestroyed) { + if (cb) { + cb(err); + } else if (err) { + if (!this._writableState) { + process.nextTick(emitErrorNT, this, err); + } else if (!this._writableState.errorEmitted) { + this._writableState.errorEmitted = true; + process.nextTick(emitErrorNT, this, err); + } + } + + return this; + } // we set destroyed to true before firing error callbacks in order + // to make it re-entrance safe in case destroy() is called within callbacks + + + if (this._readableState) { + this._readableState.destroyed = true; + } // if this is a duplex stream mark the writable part as destroyed as well + + + if (this._writableState) { + this._writableState.destroyed = true; + } + + this._destroy(err || null, function (err) { + if (!cb && err) { + if (!_this._writableState) { + process.nextTick(emitErrorAndCloseNT, _this, err); + } else if (!_this._writableState.errorEmitted) { + _this._writableState.errorEmitted = true; + process.nextTick(emitErrorAndCloseNT, _this, err); + } else { + process.nextTick(emitCloseNT, _this); + } + } else if (cb) { + process.nextTick(emitCloseNT, _this); + cb(err); + } else { + process.nextTick(emitCloseNT, _this); + } + }); + + return this; +} + +function emitErrorAndCloseNT(self, err) { + emitErrorNT(self, err); + emitCloseNT(self); +} + +function emitCloseNT(self) { + if (self._writableState && !self._writableState.emitClose) return; + if (self._readableState && !self._readableState.emitClose) return; + self.emit('close'); +} + +function undestroy() { + if (this._readableState) { + this._readableState.destroyed = false; + this._readableState.reading = false; + this._readableState.ended = false; + this._readableState.endEmitted = false; + } + + if (this._writableState) { + this._writableState.destroyed = false; + this._writableState.ended = false; + this._writableState.ending = false; + this._writableState.finalCalled = false; + this._writableState.prefinished = false; + this._writableState.finished = false; + this._writableState.errorEmitted = false; + } +} + +function emitErrorNT(self, err) { + self.emit('error', err); +} + +function errorOrDestroy(stream, err) { + // We have tests that rely on errors being emitted + // in the same tick, so changing this is semver major. + // For now when you opt-in to autoDestroy we allow + // the error to be emitted nextTick. In a future + // semver major update we should change the default to this. + var rState = stream._readableState; + var wState = stream._writableState; + if (rState && rState.autoDestroy || wState && wState.autoDestroy) stream.destroy(err);else stream.emit('error', err); +} + +module.exports = { + destroy: destroy, + undestroy: undestroy, + errorOrDestroy: errorOrDestroy +}; +}).call(this,require('_process')) +},{"_process":44}],54:[function(require,module,exports){ +// Ported from https://github.com/mafintosh/end-of-stream with +// permission from the author, Mathias Buus (@mafintosh). +'use strict'; + +var ERR_STREAM_PREMATURE_CLOSE = require('../../../errors').codes.ERR_STREAM_PREMATURE_CLOSE; + +function once(callback) { + var called = false; + return function () { + if (called) return; + called = true; + + for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) { + args[_key] = arguments[_key]; + } + + callback.apply(this, args); + }; +} + +function noop() {} + +function isRequest(stream) { + return stream.setHeader && typeof stream.abort === 'function'; +} + +function eos(stream, opts, callback) { + if (typeof opts === 'function') return eos(stream, null, opts); + if (!opts) opts = {}; + callback = once(callback || noop); + var readable = opts.readable || opts.readable !== false && stream.readable; + var writable = opts.writable || opts.writable !== false && stream.writable; + + var onlegacyfinish = function onlegacyfinish() { + if (!stream.writable) onfinish(); + }; + + var writableEnded = stream._writableState && stream._writableState.finished; + + var onfinish = function onfinish() { + writable = false; + writableEnded = true; + if (!readable) callback.call(stream); + }; + + var readableEnded = stream._readableState && stream._readableState.endEmitted; + + var onend = function onend() { + readable = false; + readableEnded = true; + if (!writable) callback.call(stream); + }; + + var onerror = function onerror(err) { + callback.call(stream, err); + }; + + var onclose = function onclose() { + var err; + + if (readable && !readableEnded) { + if (!stream._readableState || !stream._readableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE(); + return callback.call(stream, err); + } + + if (writable && !writableEnded) { + if (!stream._writableState || !stream._writableState.ended) err = new ERR_STREAM_PREMATURE_CLOSE(); + return callback.call(stream, err); + } + }; + + var onrequest = function onrequest() { + stream.req.on('finish', onfinish); + }; + + if (isRequest(stream)) { + stream.on('complete', onfinish); + stream.on('abort', onclose); + if (stream.req) onrequest();else stream.on('request', onrequest); + } else if (writable && !stream._writableState) { + // legacy streams + stream.on('end', onlegacyfinish); + stream.on('close', onlegacyfinish); + } + + stream.on('end', onend); + stream.on('finish', onfinish); + if (opts.error !== false) stream.on('error', onerror); + stream.on('close', onclose); + return function () { + stream.removeListener('complete', onfinish); + stream.removeListener('abort', onclose); + stream.removeListener('request', onrequest); + if (stream.req) stream.req.removeListener('finish', onfinish); + stream.removeListener('end', onlegacyfinish); + stream.removeListener('close', onlegacyfinish); + stream.removeListener('finish', onfinish); + stream.removeListener('end', onend); + stream.removeListener('error', onerror); + stream.removeListener('close', onclose); + }; +} + +module.exports = eos; +},{"../../../errors":45}],55:[function(require,module,exports){ +module.exports = function () { + throw new Error('Readable.from is not available in the browser') +}; + +},{}],56:[function(require,module,exports){ +// Ported from https://github.com/mafintosh/pump with +// permission from the author, Mathias Buus (@mafintosh). +'use strict'; + +var eos; + +function once(callback) { + var called = false; + return function () { + if (called) return; + called = true; + callback.apply(void 0, arguments); + }; +} + +var _require$codes = require('../../../errors').codes, + ERR_MISSING_ARGS = _require$codes.ERR_MISSING_ARGS, + ERR_STREAM_DESTROYED = _require$codes.ERR_STREAM_DESTROYED; + +function noop(err) { + // Rethrow the error if it exists to avoid swallowing it + if (err) throw err; +} + +function isRequest(stream) { + return stream.setHeader && typeof stream.abort === 'function'; +} + +function destroyer(stream, reading, writing, callback) { + callback = once(callback); + var closed = false; + stream.on('close', function () { + closed = true; + }); + if (eos === undefined) eos = require('./end-of-stream'); + eos(stream, { + readable: reading, + writable: writing + }, function (err) { + if (err) return callback(err); + closed = true; + callback(); + }); + var destroyed = false; + return function (err) { + if (closed) return; + if (destroyed) return; + destroyed = true; // request.destroy just do .end - .abort is what we want + + if (isRequest(stream)) return stream.abort(); + if (typeof stream.destroy === 'function') return stream.destroy(); + callback(err || new ERR_STREAM_DESTROYED('pipe')); + }; +} + +function call(fn) { + fn(); +} + +function pipe(from, to) { + return from.pipe(to); +} + +function popCallback(streams) { + if (!streams.length) return noop; + if (typeof streams[streams.length - 1] !== 'function') return noop; + return streams.pop(); +} + +function pipeline() { + for (var _len = arguments.length, streams = new Array(_len), _key = 0; _key < _len; _key++) { + streams[_key] = arguments[_key]; + } + + var callback = popCallback(streams); + if (Array.isArray(streams[0])) streams = streams[0]; + + if (streams.length < 2) { + throw new ERR_MISSING_ARGS('streams'); + } + + var error; + var destroys = streams.map(function (stream, i) { + var reading = i < streams.length - 1; + var writing = i > 0; + return destroyer(stream, reading, writing, function (err) { + if (!error) error = err; + if (err) destroys.forEach(call); + if (reading) return; + destroys.forEach(call); + callback(error); + }); + }); + return streams.reduce(pipe); +} + +module.exports = pipeline; +},{"../../../errors":45,"./end-of-stream":54}],57:[function(require,module,exports){ +'use strict'; + +var ERR_INVALID_OPT_VALUE = require('../../../errors').codes.ERR_INVALID_OPT_VALUE; + +function highWaterMarkFrom(options, isDuplex, duplexKey) { + return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null; +} + +function getHighWaterMark(state, options, duplexKey, isDuplex) { + var hwm = highWaterMarkFrom(options, isDuplex, duplexKey); + + if (hwm != null) { + if (!(isFinite(hwm) && Math.floor(hwm) === hwm) || hwm < 0) { + var name = isDuplex ? duplexKey : 'highWaterMark'; + throw new ERR_INVALID_OPT_VALUE(name, hwm); + } + + return Math.floor(hwm); + } // Default value + + + return state.objectMode ? 16 : 16 * 1024; +} + +module.exports = { + getHighWaterMark: getHighWaterMark +}; +},{"../../../errors":45}],58:[function(require,module,exports){ +arguments[4][24][0].apply(exports,arguments) +},{"dup":24,"events":27}],59:[function(require,module,exports){ +exports = module.exports = require('./lib/_stream_readable.js'); +exports.Stream = exports; +exports.Readable = exports; +exports.Writable = require('./lib/_stream_writable.js'); +exports.Duplex = require('./lib/_stream_duplex.js'); +exports.Transform = require('./lib/_stream_transform.js'); +exports.PassThrough = require('./lib/_stream_passthrough.js'); +exports.finished = require('./lib/internal/streams/end-of-stream.js'); +exports.pipeline = require('./lib/internal/streams/pipeline.js'); + +},{"./lib/_stream_duplex.js":46,"./lib/_stream_passthrough.js":47,"./lib/_stream_readable.js":48,"./lib/_stream_transform.js":49,"./lib/_stream_writable.js":50,"./lib/internal/streams/end-of-stream.js":54,"./lib/internal/streams/pipeline.js":56}],60:[function(require,module,exports){ +'use strict' + +function ReInterval (callback, interval, args) { + var self = this; + + this._callback = callback; + this._args = args; + + this._interval = setInterval(callback, interval, this._args); + + this.reschedule = function (interval) { + // if no interval entered, use the interval passed in on creation + if (!interval) + interval = self._interval; + + if (self._interval) + clearInterval(self._interval); + self._interval = setInterval(self._callback, interval, self._args); + }; + + this.clear = function () { + if (self._interval) { + clearInterval(self._interval); + self._interval = undefined; + } + }; + + this.destroy = function () { + if (self._interval) { + clearInterval(self._interval); + } + self._callback = undefined; + self._interval = undefined; + self._args = undefined; + }; +} + +function reInterval () { + if (typeof arguments[0] !== 'function') + throw new Error('callback needed'); + if (typeof arguments[1] !== 'number') + throw new Error('interval needed'); + + var args; + + if (arguments.length > 0) { + args = new Array(arguments.length - 2); + + for (var i = 0; i < args.length; i++) { + args[i] = arguments[i + 2]; + } + } + + return new ReInterval(arguments[0], arguments[1], args); +} + +module.exports = reInterval; + +},{}],61:[function(require,module,exports){ +/* eslint-disable node/no-deprecated-api */ +var buffer = require('buffer') +var Buffer = buffer.Buffer + +// alternative to using Object.keys for old browsers +function copyProps (src, dst) { + for (var key in src) { + dst[key] = src[key] + } +} +if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) { + module.exports = buffer +} else { + // Copy properties from require('buffer') + copyProps(buffer, exports) + exports.Buffer = SafeBuffer +} + +function SafeBuffer (arg, encodingOrOffset, length) { + return Buffer(arg, encodingOrOffset, length) +} + +// Copy static methods from Buffer +copyProps(Buffer, SafeBuffer) + +SafeBuffer.from = function (arg, encodingOrOffset, length) { + if (typeof arg === 'number') { + throw new TypeError('Argument must not be a number') + } + return Buffer(arg, encodingOrOffset, length) +} + +SafeBuffer.alloc = function (size, fill, encoding) { + if (typeof size !== 'number') { + throw new TypeError('Argument must be a number') + } + var buf = Buffer(size) + if (fill !== undefined) { + if (typeof encoding === 'string') { + buf.fill(fill, encoding) + } else { + buf.fill(fill) + } + } else { + buf.fill(0) + } + return buf +} + +SafeBuffer.allocUnsafe = function (size) { + if (typeof size !== 'number') { + throw new TypeError('Argument must be a number') + } + return Buffer(size) +} + +SafeBuffer.allocUnsafeSlow = function (size) { + if (typeof size !== 'number') { + throw new TypeError('Argument must be a number') + } + return buffer.SlowBuffer(size) +} + +},{"buffer":12}],62:[function(require,module,exports){ +module.exports = shift + +function shift (stream) { + var rs = stream._readableState + if (!rs) return null + return (rs.objectMode || typeof stream._duplexState === 'number') ? stream.read() : stream.read(getStateLength(rs)) +} + +function getStateLength (state) { + if (state.buffer.length) { + // Since node 6.3.0 state.buffer is a BufferList not an array + if (state.buffer.head) { + return state.buffer.head.data.length + } + + return state.buffer[0].length + } + + return state.length +} + +},{}],63:[function(require,module,exports){ +// Copyright Joyent, Inc. and other Node contributors. +// +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the +// "Software"), to deal in the Software without restriction, including +// without limitation the rights to use, copy, modify, merge, publish, +// distribute, sublicense, and/or sell copies of the Software, and to permit +// persons to whom the Software is furnished to do so, subject to the +// following conditions: +// +// The above copyright notice and this permission notice shall be included +// in all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN +// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE +// USE OR OTHER DEALINGS IN THE SOFTWARE. + +'use strict'; + +/**/ + +var Buffer = require('safe-buffer').Buffer; +/**/ + +var isEncoding = Buffer.isEncoding || function (encoding) { + encoding = '' + encoding; + switch (encoding && encoding.toLowerCase()) { + case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw': + return true; + default: + return false; + } +}; + +function _normalizeEncoding(enc) { + if (!enc) return 'utf8'; + var retried; + while (true) { + switch (enc) { + case 'utf8': + case 'utf-8': + return 'utf8'; + case 'ucs2': + case 'ucs-2': + case 'utf16le': + case 'utf-16le': + return 'utf16le'; + case 'latin1': + case 'binary': + return 'latin1'; + case 'base64': + case 'ascii': + case 'hex': + return enc; + default: + if (retried) return; // undefined + enc = ('' + enc).toLowerCase(); + retried = true; + } + } +}; + +// Do not cache `Buffer.isEncoding` when checking encoding names as some +// modules monkey-patch it to support additional encodings +function normalizeEncoding(enc) { + var nenc = _normalizeEncoding(enc); + if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc); + return nenc || enc; +} + +// StringDecoder provides an interface for efficiently splitting a series of +// buffers into a series of JS strings without breaking apart multi-byte +// characters. +exports.StringDecoder = StringDecoder; +function StringDecoder(encoding) { + this.encoding = normalizeEncoding(encoding); + var nb; + switch (this.encoding) { + case 'utf16le': + this.text = utf16Text; + this.end = utf16End; + nb = 4; + break; + case 'utf8': + this.fillLast = utf8FillLast; + nb = 4; + break; + case 'base64': + this.text = base64Text; + this.end = base64End; + nb = 3; + break; + default: + this.write = simpleWrite; + this.end = simpleEnd; + return; + } + this.lastNeed = 0; + this.lastTotal = 0; + this.lastChar = Buffer.allocUnsafe(nb); +} + +StringDecoder.prototype.write = function (buf) { + if (buf.length === 0) return ''; + var r; + var i; + if (this.lastNeed) { + r = this.fillLast(buf); + if (r === undefined) return ''; + i = this.lastNeed; + this.lastNeed = 0; + } else { + i = 0; + } + if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i); + return r || ''; +}; + +StringDecoder.prototype.end = utf8End; + +// Returns only complete characters in a Buffer +StringDecoder.prototype.text = utf8Text; + +// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer +StringDecoder.prototype.fillLast = function (buf) { + if (this.lastNeed <= buf.length) { + buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed); + return this.lastChar.toString(this.encoding, 0, this.lastTotal); + } + buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length); + this.lastNeed -= buf.length; +}; + +// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a +// continuation byte. If an invalid byte is detected, -2 is returned. +function utf8CheckByte(byte) { + if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4; + return byte >> 6 === 0x02 ? -1 : -2; +} + +// Checks at most 3 bytes at the end of a Buffer in order to detect an +// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4) +// needed to complete the UTF-8 character (if applicable) are returned. +function utf8CheckIncomplete(self, buf, i) { + var j = buf.length - 1; + if (j < i) return 0; + var nb = utf8CheckByte(buf[j]); + if (nb >= 0) { + if (nb > 0) self.lastNeed = nb - 1; + return nb; + } + if (--j < i || nb === -2) return 0; + nb = utf8CheckByte(buf[j]); + if (nb >= 0) { + if (nb > 0) self.lastNeed = nb - 2; + return nb; + } + if (--j < i || nb === -2) return 0; + nb = utf8CheckByte(buf[j]); + if (nb >= 0) { + if (nb > 0) { + if (nb === 2) nb = 0;else self.lastNeed = nb - 3; + } + return nb; + } + return 0; +} + +// Validates as many continuation bytes for a multi-byte UTF-8 character as +// needed or are available. If we see a non-continuation byte where we expect +// one, we "replace" the validated continuation bytes we've seen so far with +// a single UTF-8 replacement character ('\ufffd'), to match v8's UTF-8 decoding +// behavior. The continuation byte check is included three times in the case +// where all of the continuation bytes for a character exist in the same buffer. +// It is also done this way as a slight performance increase instead of using a +// loop. +function utf8CheckExtraBytes(self, buf, p) { + if ((buf[0] & 0xC0) !== 0x80) { + self.lastNeed = 0; + return '\ufffd'; + } + if (self.lastNeed > 1 && buf.length > 1) { + if ((buf[1] & 0xC0) !== 0x80) { + self.lastNeed = 1; + return '\ufffd'; + } + if (self.lastNeed > 2 && buf.length > 2) { + if ((buf[2] & 0xC0) !== 0x80) { + self.lastNeed = 2; + return '\ufffd'; + } + } + } +} + +// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer. +function utf8FillLast(buf) { + var p = this.lastTotal - this.lastNeed; + var r = utf8CheckExtraBytes(this, buf, p); + if (r !== undefined) return r; + if (this.lastNeed <= buf.length) { + buf.copy(this.lastChar, p, 0, this.lastNeed); + return this.lastChar.toString(this.encoding, 0, this.lastTotal); + } + buf.copy(this.lastChar, p, 0, buf.length); + this.lastNeed -= buf.length; +} + +// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a +// partial character, the character's bytes are buffered until the required +// number of bytes are available. +function utf8Text(buf, i) { + var total = utf8CheckIncomplete(this, buf, i); + if (!this.lastNeed) return buf.toString('utf8', i); + this.lastTotal = total; + var end = buf.length - (total - this.lastNeed); + buf.copy(this.lastChar, 0, end); + return buf.toString('utf8', i, end); +} + +// For UTF-8, a replacement character is added when ending on a partial +// character. +function utf8End(buf) { + var r = buf && buf.length ? this.write(buf) : ''; + if (this.lastNeed) return r + '\ufffd'; + return r; +} + +// UTF-16LE typically needs two bytes per character, but even if we have an even +// number of bytes available, we need to check if we end on a leading/high +// surrogate. In that case, we need to wait for the next two bytes in order to +// decode the last character properly. +function utf16Text(buf, i) { + if ((buf.length - i) % 2 === 0) { + var r = buf.toString('utf16le', i); + if (r) { + var c = r.charCodeAt(r.length - 1); + if (c >= 0xD800 && c <= 0xDBFF) { + this.lastNeed = 2; + this.lastTotal = 4; + this.lastChar[0] = buf[buf.length - 2]; + this.lastChar[1] = buf[buf.length - 1]; + return r.slice(0, -1); + } + } + return r; + } + this.lastNeed = 1; + this.lastTotal = 2; + this.lastChar[0] = buf[buf.length - 1]; + return buf.toString('utf16le', i, buf.length - 1); +} + +// For UTF-16LE we do not explicitly append special replacement characters if we +// end on a partial character, we simply let v8 handle that. +function utf16End(buf) { + var r = buf && buf.length ? this.write(buf) : ''; + if (this.lastNeed) { + var end = this.lastTotal - this.lastNeed; + return r + this.lastChar.toString('utf16le', 0, end); + } + return r; +} + +function base64Text(buf, i) { + var n = (buf.length - i) % 3; + if (n === 0) return buf.toString('base64', i); + this.lastNeed = 3 - n; + this.lastTotal = 3; + if (n === 1) { + this.lastChar[0] = buf[buf.length - 1]; + } else { + this.lastChar[0] = buf[buf.length - 2]; + this.lastChar[1] = buf[buf.length - 1]; + } + return buf.toString('base64', i, buf.length - n); +} + +function base64End(buf) { + var r = buf && buf.length ? this.write(buf) : ''; + if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed); + return r; +} + +// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex) +function simpleWrite(buf) { + return buf.toString(this.encoding); +} + +function simpleEnd(buf) { + return buf && buf.length ? this.write(buf) : ''; +} +},{"safe-buffer":61}],64:[function(require,module,exports){ +(function (setImmediate,clearImmediate){ +var nextTick = require('process/browser.js').nextTick; +var apply = Function.prototype.apply; +var slice = Array.prototype.slice; +var immediateIds = {}; +var nextImmediateId = 0; + +// DOM APIs, for completeness + +exports.setTimeout = function() { + return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout); +}; +exports.setInterval = function() { + return new Timeout(apply.call(setInterval, window, arguments), clearInterval); +}; +exports.clearTimeout = +exports.clearInterval = function(timeout) { timeout.close(); }; + +function Timeout(id, clearFn) { + this._id = id; + this._clearFn = clearFn; +} +Timeout.prototype.unref = Timeout.prototype.ref = function() {}; +Timeout.prototype.close = function() { + this._clearFn.call(window, this._id); +}; + +// Does not start the time, just sets up the members needed. +exports.enroll = function(item, msecs) { + clearTimeout(item._idleTimeoutId); + item._idleTimeout = msecs; +}; + +exports.unenroll = function(item) { + clearTimeout(item._idleTimeoutId); + item._idleTimeout = -1; +}; + +exports._unrefActive = exports.active = function(item) { + clearTimeout(item._idleTimeoutId); + + var msecs = item._idleTimeout; + if (msecs >= 0) { + item._idleTimeoutId = setTimeout(function onTimeout() { + if (item._onTimeout) + item._onTimeout(); + }, msecs); + } +}; + +// That's not how node.js implements it but the exposed api is the same. +exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) { + var id = nextImmediateId++; + var args = arguments.length < 2 ? false : slice.call(arguments, 1); + + immediateIds[id] = true; + + nextTick(function onNextTick() { + if (immediateIds[id]) { + // fn.call() is faster so we optimize for the common use-case + // @see http://jsperf.com/call-apply-segu + if (args) { + fn.apply(null, args); + } else { + fn.call(null); + } + // Prevent ids from leaking + exports.clearImmediate(id); + } + }); + + return id; +}; + +exports.clearImmediate = typeof clearImmediate === "function" ? clearImmediate : function(id) { + delete immediateIds[id]; +}; +}).call(this,require("timers").setImmediate,require("timers").clearImmediate) +},{"process/browser.js":44,"timers":64}],65:[function(require,module,exports){ +(function (global){ + +/** + * Module exports. + */ + +module.exports = deprecate; + +/** + * Mark that a method should not be used. + * Returns a modified function which warns once by default. + * + * If `localStorage.noDeprecation = true` is set, then it is a no-op. + * + * If `localStorage.throwDeprecation = true` is set, then deprecated functions + * will throw an Error when invoked. + * + * If `localStorage.traceDeprecation = true` is set, then deprecated functions + * will invoke `console.trace()` instead of `console.error()`. + * + * @param {Function} fn - the function to deprecate + * @param {String} msg - the string to print to the console when `fn` is invoked + * @returns {Function} a new "deprecated" version of `fn` + * @api public + */ + +function deprecate (fn, msg) { + if (config('noDeprecation')) { + return fn; + } + + var warned = false; + function deprecated() { + if (!warned) { + if (config('throwDeprecation')) { + throw new Error(msg); + } else if (config('traceDeprecation')) { + console.trace(msg); + } else { + console.warn(msg); + } + warned = true; + } + return fn.apply(this, arguments); + } + + return deprecated; +} + +/** + * Checks `localStorage` for boolean values for the given `name`. + * + * @param {String} name + * @returns {Boolean} + * @api private + */ + +function config (name) { + // accessing global.localStorage can trigger a DOMException in sandboxed iframes + try { + if (!global.localStorage) return false; + } catch (_) { + return false; + } + var val = global.localStorage[name]; + if (null == val) return false; + return String(val).toLowerCase() === 'true'; +} + +}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {}) +},{}],66:[function(require,module,exports){ +// Returns a wrapper function that returns a wrapped callback +// The wrapper function should do some stuff, and return a +// presumably different callback function. +// This makes sure that own properties are retained, so that +// decorations and such are not lost along the way. +module.exports = wrappy +function wrappy (fn, cb) { + if (fn && cb) return wrappy(fn)(cb) + + if (typeof fn !== 'function') + throw new TypeError('need wrapper function') + + Object.keys(fn).forEach(function (k) { + wrapper[k] = fn[k] + }) + + return wrapper + + function wrapper() { + var args = new Array(arguments.length) + for (var i = 0; i < args.length; i++) { + args[i] = arguments[i] + } + var ret = fn.apply(this, args) + var cb = args[args.length-1] + if (typeof ret === 'function' && ret !== cb) { + Object.keys(cb).forEach(function (k) { + ret[k] = cb[k] + }) + } + return ret + } +} + +},{}],67:[function(require,module,exports){ +'use strict'; + +module.exports = function () { + throw new Error( + 'ws does not work in the browser. Browser clients must use the native ' + + 'WebSocket object' + ); +}; + +},{}],68:[function(require,module,exports){ +module.exports = extend + +var hasOwnProperty = Object.prototype.hasOwnProperty; + +function extend() { + var target = {} + + for (var i = 0; i < arguments.length; i++) { + var source = arguments[i] + + for (var key in source) { + if (hasOwnProperty.call(source, key)) { + target[key] = source[key] + } + } + } + + return target +} + +},{}]},{},[9])(9) +}); diff --git a/libraries/mqtt.xml b/libraries/mqtt.xml new file mode 100644 index 00000000..53dfb87f --- /dev/null +++ b/libraries/mqtt.xml @@ -0,0 +1 @@ +Connect to a broker The options are not required but can be filled if needed 1. username (some brokers need this) 2. password (some brokers need this) 3. keepalive (default time is 60 seconds but some brokers need a shorter time) 4. connection callback (ringed set of scripts to be run when connection is made or remade) Note: The connection callback doesn''t have to be the 4th option - it just has to be the last (or only) option. ADVANCED: The brokers offered in the menu are accessed using default ports and basepaths (if needed). If accessing other brokers, the complete urls should be formed like this: siteURL:port/basepath e.g mqtt.eclipseprojects.io:443/mqtt
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.io test.mosquitto.orgconnection statuscallbackconnection statusconnectingcallbackoptionsusername1password2keepalive3mqt_connect(broker,callback,options)connectingconnectedPublish a message to an MQTT broker The options are not required but can be filled if needed 1. qos (quality of service 0,1 or 2) 2. retain flag (boolean)
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.ionamehellooptionsqos1retain2mqt_pub(broker,topic,message,options)Subscribe to a topic on a broker Make sure you have already run an MQTT connect block before using this one You should add a script to be run inside he grey ring. It will be run each time a message is received If you click on the arrow on the grey ring twice, you can use #1 and #2 inside yoiru script. #1 will contain the received message #2 will contain the received topic name
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.ioname
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.ioname
allall broker.emqx.io mqtt.eclipseprojects.io test.mosquitto.org
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.io test.mosquitto.orgnamereceived messagereceived topic
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.io test.mosquitto.orgnameidCallhelloreceived messagereceived topic/idCall-
namehello
broker.emqx.iobroker.emqx.io mqtt.eclipseprojects.io test.mosquitto.orgnameidCallhelloreceived messagereceived topic/idCall-1 \ No newline at end of file diff --git a/libraries/mqttExtension.js b/libraries/mqttExtension.js new file mode 100644 index 00000000..479bc98f --- /dev/null +++ b/libraries/mqttExtension.js @@ -0,0 +1,293 @@ +/* MQTTExtension.js - add MQTT protocol to Snap! + * =========================================== + * MQTT library developed by Xavier Pi + * Modified by Simon Walters + * and converted into an extension + * November 2021 + */ + + + +SnapExtensions.primitives.set( + 'mqt_connect(broker,callback,options)', + function (broker,callback,options,proc) { + /* original code from github.com/pixavier/mqtt4snap */ + /* adapted into extension by cymplecy 26Nov21 */ + /* modified to add in keepalive parameter by cymplecy 23Nov21 */ + function log(txt) { + console.log('mqt_connect: ', new Date().toString(), txt); + } + + broker = broker ? broker.trim() : broker; + + options = JSON.parse(options); + const opts = {}; + if (options['username']) { + opts.username = options['username']; + if (options["password"]) { + opts.password = options['password']; + } else { + opts.password = ''; + } + } + + if (options["keepalive"]) { + opts.keepalive = Number(options["keepalive"]); + } + + var stage = this.parentThatIsA(StageMorph); + + if (!('mqtt' in stage)){ + stage.mqtt = []; + } + + let wsbroker; + + if (broker.startsWith('ws://')) { + wsbroker = broker; + } else if (broker.startsWith('wss://')) { + wsbroker = broker; + } else { + let prefix; + prefix = window.location.protocol == 'https:'?'wss':'ws'; + wsbroker = prefix + '://' + broker; + } + if (wsbroker == 'wss://broker.emqx.io') { + wsbroker = wsbroker + ':8084/mqtt' + } else if (wsbroker == 'ws://broker.emqx.io') { + wsbroker = wsbroker + ':8083/mqtt' + } else if (broker == 'mqtt.eclipseprojects.io') { + wsbroker = wsbroker + '/mqtt' + } else if (wsbroker == 'wss://test.mosquitto.org') { + wsbroker = wsbroker + ':8081' + } else if (wsbroker == 'ws://test.mosquitto.org') { + wsbroker = wsbroker + ':8080' + } else if (wsbroker == 'wss://simplesi.cloud') { + wsbroker = wsbroker + ':8084' + } else if (wsbroker == 'ws://simplesi.cloud') { + wsbroker = wsbroker + ':8083' + } + //log(wsbroker) + try { + stage.mqtt[broker].end(true); + } catch (e){} + delete stage.mqtt[broker]; + + stage.mqtt[broker] = mqtt.connect(wsbroker, opts); + + stage.mqtt[broker].on('connect', function(connack) { + log('Connected to ' + wsbroker); + if (callback) { + let p = new Process(); + p.initializeFor(callback, new List(["all"])) + //console.log("here1") + stage.threads.processes.push(p); + //log('Callback process pushed'); + } + try { + proc.doSetVar('connection status', 'connected'); + } catch(e) {} + }); + + stage.mqtt[broker].stream.on('error', function(error) { + log('error event triggered'); + try{ + stage.mqtt[broker].end(); + }catch(e){} + delete stage.mqtt[broker]; + try { + proc.doSetVar('connection status', 'failed to connect to ' + broker); + } catch(e) {} + //alert(error.message); + }); + + + } + +); + + +SnapExtensions.primitives.set( + 'mqt_pub(broker,topic,message,options)', + function (broker,topic,message,options) { + /* original code from github.com/pixavier/mqtt4snap */ + /* adapted into extension by cymplecy 26Nov21 */ + /* modified 5 Sep2021 by cymplecy to add parameters for qos and retain flag */ + function log(txt) { + console.log('mqt_pub: ', new Date().toString(), txt); + } + + broker = broker ? broker.trim() : broker; + topic = topic ? topic.trim() : topic; + //payload not trimmed as might have real leading/trailing spaces + console.log(options) + options = JSON.parse(options); + const opts = {}; + if (options['qos']) { + opts.qos = Number(options['qos']); + } + if (options["retain"]) { + opts.retain = options["retain"]; + } + + let stage = this.parentThatIsA(StageMorph); + + if (!('mqtt' in stage)){ + log('No connection to any broker ' + broker); + throw new Error('No connection to any broker ' + broker); + } + + if(!stage.mqtt[broker]){ + log('No connection to broker ' + broker); + throw new Error('No connection to broker ' + broker); + } + + //let prefix = window.location.protocol == 'https:'?'wss':'ws'; + //let wsbroker = prefix+'://'+broker; + + + try{ + let client = stage.mqtt[broker]; + client.publish(topic, '' + message, opts); + console.log(opts) + } catch(e) { + log('Failed to publish message ' + message); + // console.log(e); + throw e; + } + } +); + +SnapExtensions.primitives.set( + 'mqt_sub(broker,topic,callback,options)', + function (broker,topic,callback,options) { + /* github.com/pixavier/mqtt4snap */ + /* adapted into extension by cymplecy 26Nov21 */ + function log(txt) { + console.log('mqt_sub: ', new Date().toString(), txt); + } + + broker = broker ? broker.trim() : broker; + topic = topic ? topic.trim() : topic; + + let stage = this.parentThatIsA(StageMorph); + + if (!('mqtt' in stage)){ + log('No connection to any broker ' + broker); + throw new Error('No connection to any broker '+broker); + } + + //let prefix = window.location.protocol == 'https:'?'wss':'ws'; + //let wsbroker = prefix+'://'+broker; + + if (stage.mqtt[broker]) { + try {stage.mqtt[broker].unsubscribe(topic);}catch(e){} + } else { + log('No connection to broker ' + broker); + throw new Error('No connection to broker '+broker); + } + + stage.mqtt[broker].subscribe(topic); + + let mqttListener = function (aTopic, payload) { + // if (aTopic !== topic) { return; } + if (!mqttWildcard(aTopic, topic)) {return;} + let p = new Process(); + try { + p.initializeFor(callback, new List([payload.toString() , aTopic])); + } catch(e) { + p.initializeFor(callback, new List([])); + } + stage.threads.processes.push(p); + }; + + stage.mqtt[broker].on('message', mqttListener); + + let mqttWildcard = function (topic, wildcard) { + if (topic === wildcard) {return true;} + else if (wildcard === '#') {return true;} + + var res = []; + var t = String(topic).split('/'); + var w = String(wildcard).split('/'); + var i = 0; + for (var lt = t.length; i < lt; i++) { + if (w[i] === '+') { + res.push(t[i]); + } else if (w[i] === '#') { + res.push(t.slice(i).join('/')); + return true; + } else if (w[i] !== t[i]) { + return false; + } + } + if (w[i] === '#') {i += 1;} + return (i === w.length) ? true : false; + } + } +); + +SnapExtensions.primitives.set( + 'mqt_disconnect(broker)', + function (broker) { + /* original code from github.com/pixavier/mqtt4snap */ + /* adapted into extension by cymplecy 26Nov21 */ + + let stage = this.parentThatIsA(StageMorph); + + try { + if(broker=='all'){ + for(let brok of Object.keys(stage.mqtt)){ + try { + stage.mqtt[brok].end(true); + } catch (e0) { + //console.log('e0'); + //console.log(e0); + } + } + } else { + stage.mqtt[broker].end(true); + } + } catch(e1){ + //console.log('e1'); + //console.log(e1); + } + try{ + if(broker=='all'){ + try { + delete stage.mqtt; + stage.mqtt=[]; + } catch (e2) { + //console.log('e2'); + //console.log(e2); + } + } else { + delete stage.mqtt[broker]; + } + } catch(e3){ + //console.log('e3'); + //console.log(e3); + } + } +); + +SnapExtensions.primitives.set( + 'mqt_unsub(broker,topic)', + function (broker,topic) { + /* original code from github.com/pixavier/mqtt4snap */ + /* adapted into extension by cymplecy 26Nov21 */ + + let stage = this.parentThatIsA(StageMorph); + try{ + stage.mqtt[broker].unsubscribe(topic); + let listeners = stage.mqtt[broker].listeners('message'); + // https://github.com/mqttjs/async-mqtt/issues/31 + listeners.forEach((listener) => { + //console.dir(listener); + stage.mqtt[broker].removeListener('message', listener); + }) + } catch(e){ + //console.log(e); + } + } +) diff --git a/snap.html b/snap.html index e45ef477..bd303ad4 100755 --- a/snap.html +++ b/snap.html @@ -1,7 +1,7 @@ - Snap! 7.1.5 - dev - Build Your Own Blocks + Snap! 7.2.0 - dev - Build Your Own Blocks @@ -20,7 +20,7 @@ - + diff --git a/src/gui.js b/src/gui.js index 1bb85e88..84ab7032 100644 --- a/src/gui.js +++ b/src/gui.js @@ -86,7 +86,7 @@ BlockVisibilityDialogMorph, ThreadManager*/ // Global stuff //////////////////////////////////////////////////////// -modules.gui = '2022-February-17'; +modules.gui = '2022-February-18'; // Declarations @@ -4775,7 +4775,7 @@ IDE_Morph.prototype.aboutSnap = function () { module, btn1, btn2, btn3, btn4, licenseBtn, translatorsBtn, world = this.world(); - aboutTxt = 'Snap! 7.1.5 - dev -\nBuild Your Own Blocks\n\n' + aboutTxt = 'Snap! 7.2.0 - dev -\nBuild Your Own Blocks\n\n' + 'Copyright \u24B8 2008-2022 Jens M\u00F6nig and ' + 'Brian Harvey\n' + 'jens@moenig.org, bh@cs.berkeley.edu\n\n' @@ -4828,6 +4828,7 @@ IDE_Morph.prototype.aboutSnap = function () { + '\nIan Reynolds: UI Design, Event Bindings, ' + 'Sound primitives' + '\nJadga Hügle: Icons and countless other contributions' + + '\nSimon Walters & Xavier Pi: MQTT extension' + '\nIvan Motyashov: Initial Squeak Porting' + '\nLucas Karahadian: Piano Keyboard Design' + '\nDavide Della Casa: Morphic Optimizations' diff --git a/sw.js b/sw.js index 7e777d42..caaf135a 100644 --- a/sw.js +++ b/sw.js @@ -1,4 +1,4 @@ -var snapVersion = '7.1.5-dev', +var snapVersion = '7.2.0-dev', cacheName = 'snap-pwa', filesToCache = [ 'snap.html', @@ -98,6 +98,9 @@ var snapVersion = '7.1.5-dev', 'libraries/localstorage_module.xml', 'libraries/make-variables.xml', 'libraries/maps_module.xml', + 'libraries/mqttExtension.js', + 'libraries/mqtt.js', + 'libraries/mqtt.xml', 'libraries/parallel_module.xml', 'libraries/pixel_module.xml', 'libraries/schemeNumber.js',