1621 wiersze
55 KiB
PHP
1621 wiersze
55 KiB
PHP
<?php
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/*
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* "This code is not a code of honour... no highly esteemed code is commemorated here... nothing valued is here."
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* "What is here is dangerous and repulsive to us. This message is a warning about danger."
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* This is a rudimentary, single-file, low complexity, minimum functionality, ActivityPub server.
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* For educational purposes only.
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* The Server produces an Actor who can be followed.
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* The Actor can send messages to followers.
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* The message can have linkable URls, hashtags, and mentions.
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* An image and alt text can be attached to the message.
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* The Actor can follow remote accounts.
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* The Server saves logs about requests it receives and sends.
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* This code is NOT suitable for production use.
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* SPDX-License-Identifier: AGPL-3.0-or-later
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* This code is also "licenced" under CRAPL v0 - https://matt.might.net/articles/crapl/
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* "Any appearance of design in the Program is purely coincidental and should not in any way be mistaken for evidence of thoughtful software construction."
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* For more information, please re-read.
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*/
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// Preamble: Set your details here
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// This is where you set up your account's name and bio.
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// You also need to provide a public/private keypair.
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// The posting page is protected with a password that also needs to be set here.
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// Set up the Actor's information
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// Edit these:
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$username = rawurlencode("example"); // Type the @ username that you want. Do not include an "@".
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$realName = "E. Xample. Jr."; // This is the user's "real" name.
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$summary = "Some text about the user."; // This is the bio of your user.
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// Generate locally or from https://cryptotools.net/rsagen
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// Newlines must be replaced with "\n"
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$key_private = "-----BEGIN RSA PRIVATE KEY-----\n...\n-----END RSA PRIVATE KEY-----";
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$key_public = "-----BEGIN PUBLIC KEY-----\n...\n-----END PUBLIC KEY-----";
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// Password for sending messages
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$password = "P4ssW0rd";
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/** No need to edit anything below here. But please go exploring! **/
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// Internal data
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$server = $_SERVER["SERVER_NAME"]; // Do not change this!
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// Some requests require a User-Agent string.
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define("USERAGENT", "activitypub-single-php-file/0.0");
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// Set up where logs and messages go.
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// You can change these directories to something more suitable if you like.
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$data = "data";
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$directories = array(
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"inbox" => "{$data}/inbox",
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"followers" => "{$data}/followers",
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"following" => "{$data}/following",
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"logs" => "{$data}/logs",
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"posts" => "posts",
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"images" => "images",
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);
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// Create the directories if they don't already exist.
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foreach ( $directories as $directory ) {
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if( !is_dir( $directory ) ) { mkdir( $data ); mkdir( $directory ); }
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}
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// Get the information sent to this server
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$input = file_get_contents( "php://input" );
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$body = json_decode( $input,true );
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$bodyData = print_r( $body, true );
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// If the root has been requested, manually set the path to `/`
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!empty( $_GET["path"] ) ? $path = $_GET["path"] : $path = "/";
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// Routing:
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// The .htaccess changes /whatever to /?path=whatever
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// This runs the function of the path requested.
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switch ( $path ) {
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case ".well-known/webfinger":
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webfinger(); // Mandatory. Static.
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case rawurldecode( $username ):
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case "@" . rawurldecode( $username ): // Some software assumes usernames start with an `@`
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username(); // Mandatory. Static
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case "following":
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following(); // Mandatory. Can be static or dynamic.
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case "followers":
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followers(); // Mandatory. Can be static or dynamic.
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case "inbox":
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inbox(); // Mandatory.
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case "outbox":
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outbox(); // Optional. Dynamic.
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case "write":
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write(); // User interface for writing posts.
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case "action/send":
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send(); // API for posting content to the Fediverse.
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case "users":
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users(); // User interface for (un)following & (un)blocking an external user.
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case "action/users":
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action_users(); // API for following a user.
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case "read":
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view( "read" );// User interface for reading posts.
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case ".well-known/nodeinfo":
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wk_nodeinfo(); // Optional. Static.
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case "nodeinfo/2.1":
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nodeinfo(); // Optional. Static.
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case "/":
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view( "home" );// Optional. Can be dynamic
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default:
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die();
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}
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// The WebFinger Protocol is used to identify accounts.
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// It is requested with `example.com/.well-known/webfinger?resource=acct:username@example.com`
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// This server only has one user, so it ignores the query string and always returns the same details.
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function webfinger() {
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global $username, $server;
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$webfinger = array(
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"subject" => "acct:{$username}@{$server}",
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"links" => array(
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array(
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"rel" => "self",
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"type" => "application/activity+json",
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"href" => "https://{$server}/{$username}"
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)
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)
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);
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header( "Content-Type: application/json" );
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echo json_encode( $webfinger );
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die();
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}
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// User:
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// Requesting `example.com/username` returns a JSON document with the user's information.
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function username() {
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global $username, $realName, $summary, $server, $key_public;
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$user = array(
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"@context" => [
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"https://www.w3.org/ns/activitystreams",
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"https://w3id.org/security/v1"
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],
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"id" => "https://{$server}/{$username}",
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"type" => "Person",
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"following" => "https://{$server}/following",
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"followers" => "https://{$server}/followers",
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"inbox" => "https://{$server}/inbox",
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"outbox" => "https://{$server}/outbox",
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"preferredUsername" => rawurldecode( $username ),
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"name" => "{$realName}",
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"summary" => "{$summary}",
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"url" => "https://{$server}/{$username}",
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"manuallyApprovesFollowers" => false,
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"discoverable" => true,
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"published" => "2024-02-29T12:34:56Z",
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"icon" => [
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"type" => "Image",
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"mediaType" => "image/png",
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"url" => "https://{$server}/icon.png"
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],
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"image" => [
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"type" => "Image",
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"mediaType" => "image/png",
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"url" => "https://{$server}/banner.png"
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],
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"publicKey" => [
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"id" => "https://{$server}/{$username}#main-key",
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"owner" => "https://{$server}/{$username}",
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"publicKeyPem" => $key_public
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]
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);
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header( "Content-Type: application/activity+json" );
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echo json_encode( $user );
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die();
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}
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// Follower / Following:
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// These JSON documents show how many users are following / followers-of this account.
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// The information here is self-attested. So you can lie and use any number you want.
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function following() {
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global $server, $directories;
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// Get all the files
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$following_files = glob( $directories["following"] . "/*.json");
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// Number of users
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$totalItems = count( $following_files );
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// Create a list of all the followers
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$items = array();
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foreach ( $following_files as $following_file ) {
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$following = json_decode( file_get_contents( $following_file ), true );
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$items[] = $following["id"];
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}
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$following = array(
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"@context" => "https://www.w3.org/ns/activitystreams",
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"id" => "https://{$server}/following",
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"type" => "Collection",
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"totalItems" => $totalItems,
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"items" => $items
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);
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header( "Content-Type: application/activity+json" );
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echo json_encode( $following );
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die();
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}
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function followers() {
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global $server, $directories;
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// The number of followers is self-reported.
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// You can set this to any number you like.
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// Get all the files
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$follower_files = glob( $directories["followers"] . "/*.json");
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// Number of users
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$totalItems = count( $follower_files );
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// Create a list of everyone being followed
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$items = array();
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foreach ( $follower_files as $follower_file ) {
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$following = json_decode( file_get_contents( $follower_file ),true );
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$items[] = $following["id"];
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}
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$followers = array(
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"@context" => "https://www.w3.org/ns/activitystreams",
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"id" => "https://{$server}/followers",
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"type" => "Collection",
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"totalItems" => $totalItems,
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"items" => $items
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);
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header( "Content-Type: application/activity+json" );
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echo json_encode( $followers );
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die();
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}
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// Inbox:
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// The `/inbox` is the main server. It receives all requests.
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function inbox() {
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global $body, $server, $username, $key_private, $directories;
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// Get the message and type
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$inbox_message = $body;
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$inbox_type = $inbox_message["type"];
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// Messages to ignore.
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// Some servers are very chatty. They send lots of irrelevant messages.
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// Before even bothering to validate them, we can delete them.
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// Lemmy sends lots of announce messages. The object contains details of what the message is.
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if ( is_array( $inbox_message["object"] ) ) {
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if ( match( $inbox_message["object"]["type"] ) {
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"Follow", "Undo", "Dislike", "Like" => true,
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default => false,
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} ) {
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// Discard it, no further processing.
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die();
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}
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}
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// Save any Follow, Create, Update, Announce, Like messages
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// This ignores Delete, Undo, and anything else
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if ( match( $inbox_type ) {
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"Follow", "Create", "Update", "Announce", "Like" => true,
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default => false,
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} ) {
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// Validate HTTP Message Signature
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// This logs whether the signature was validated or not
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if ( !verifyHTTPSignature() ) { die(); }
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// If the message is valid, save the message in `/data/inbox/`
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$uuid = uuid();
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$inbox_filename = $uuid . "." . urlencode( $inbox_type ) . ".json";
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file_put_contents( $directories["inbox"] . "/{$inbox_filename}", json_encode( $inbox_message ) );
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}
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// This inbox only responds to follow requests.
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// A remote server sends the inbox follow request which is a JSON file saying who they are.
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// The details of the remote user's server is saved to a file so that future messages can be delivered to the follower.
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// An accept request is cryptographically signed and POST'd back to the remote server.
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if ( "Follow" != $inbox_type ) { die(); }
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// Get the parameters
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$follower_id = $inbox_message["id"]; // E.g. https://mastodon.social/(unique id)
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$follower_actor = $inbox_message["actor"]; // E.g. https://mastodon.social/users/Edent
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// Get the actor's profile as JSON
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$follower_actor_details = getDataFromURl( $follower_actor );
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// Save the actor's data in `/data/followers/`
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$follower_filename = urlencode( $follower_actor );
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file_put_contents( $directories["followers"] . "/{$follower_filename}.json", json_encode( $follower_actor_details ) );
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// Get the new follower's Inbox
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$follower_inbox = $follower_actor_details["inbox"];
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// Response Message ID
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// This isn't used for anything important so could just be a random number
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$guid = uuid();
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// Create the Accept message to the new follower
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$message = [
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"@context" => "https://www.w3.org/ns/activitystreams",
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"id" => "https://{$server}/{$guid}",
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"type" => "Accept",
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"actor" => "https://{$server}/{$username}",
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"object" => [
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"@context" => "https://www.w3.org/ns/activitystreams",
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"id" => $follower_id,
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"type" => $inbox_type,
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"actor" => $follower_actor,
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"object" => "https://{$server}/{$username}",
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]
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];
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// The Accept is POSTed to the inbox on the server of the user who requested the follow
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sentMessageToSingle( $follower_inbox, $message );
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die();
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}
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// Unique ID:
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// Every message sent should have a unique ID.
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// This can be anything you like. Some servers use a random number.
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// I prefer a date-sortable string.
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function uuid() {
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return sprintf( "%08x-%04x-%04x-%04x-%012x",
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time(),
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mt_rand(0, 0xffff),
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mt_rand(0, 0xffff),
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mt_rand(0, 0x3fff) | 0x8000,
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mt_rand(0, 0xffffffffffff)
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);
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}
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// Headers:
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// Every message that your server sends needs to be cryptographically signed with your Private Key.
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// This is a complicated process.
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// Please read https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/ for more information.
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function generate_signed_headers( $message, $host, $path, $method ) {
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global $server, $username, $key_private;
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// Location of the Public Key
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$keyId = "https://{$server}/{$username}#main-key";
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// Get the Private Key
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$signer = openssl_get_privatekey( $key_private );
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// Timestamp this message was sent
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$date = date( "D, d M Y H:i:s \G\M\T" );
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// There are subtly different signing requirements for POST and GET.
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if ( "POST" == $method ) {
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// Encode the message object to JSON
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$message_json = json_encode( $message );
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// Generate signing variables
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$hash = hash( "sha256", $message_json, true );
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$digest = base64_encode( $hash );
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// Sign the path, host, date, and digest
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$stringToSign = "(request-target): post $path\nhost: $host\ndate: $date\ndigest: SHA-256=$digest";
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// The signing function returns the variable $signature
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// https://www.php.net/manual/en/function.openssl-sign.php
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openssl_sign(
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$stringToSign,
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$signature,
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$signer,
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OPENSSL_ALGO_SHA256
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);
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// Encode the signature
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$signature_b64 = base64_encode( $signature );
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// Full signature header
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$signature_header = 'keyId="' . $keyId . '",algorithm="rsa-sha256",headers="(request-target) host date digest",signature="' . $signature_b64 . '"';
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// Header for POST request
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$headers = array(
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"Host: {$host}",
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"Date: {$date}",
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"Digest: SHA-256={$digest}",
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"Signature: {$signature_header}",
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"Content-Type: application/activity+json",
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"Accept: application/activity+json",
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);
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} else if ( "GET" == $method ) {
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// Sign the path, host, date - NO DIGEST because there's no message sent.
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$stringToSign = "(request-target): get $path\nhost: $host\ndate: $date";
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// The signing function returns the variable $signature
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// https://www.php.net/manual/en/function.openssl-sign.php
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openssl_sign(
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$stringToSign,
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$signature,
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$signer,
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OPENSSL_ALGO_SHA256
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);
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// Encode the signature
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$signature_b64 = base64_encode( $signature );
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// Full signature header
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$signature_header = 'keyId="' . $keyId . '",algorithm="rsa-sha256",headers="(request-target) host date",signature="' . $signature_b64 . '"';
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// Header for GET request
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$headers = array(
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"Host: {$host}",
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"Date: {$date}",
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"Signature: {$signature_header}",
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"Accept: application/activity+json, application/json",
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);
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}
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return $headers;
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}
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// User Interface for Homepage.
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// This creates a basic HTML page. This content appears when someone visits the root of your site.
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function view( $style ) {
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global $username, $server, $realName, $summary, $directories;
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$rawUsername = rawurldecode( $username );
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// What sort of viewable page is this?
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switch ( $style ) {
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case "home":
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$h1 = "HomePage";
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$directory = "posts";
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break;
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case "read":
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$h1 = "InBox";
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$directory = "inbox";
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break;
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}
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// Counters for followers, following, and posts
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$follower_files = glob( $directories["followers"] . "/*.json" );
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$totalFollowers = count( $follower_files );
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$following_files = glob( $directories["following"] . "/*.json" );
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$totalFollowing = count( $following_files );
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|
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// Show the HTML page
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echo <<< HTML
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<!DOCTYPE html>
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<html lang="en-GB">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta property="og:url" content="https://{$server}">
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<meta property="og:type" content="website">
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<meta property="og:title" content="{$realName}">
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<meta property="og:description" content="{$summary}">
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<meta property="og:image" content="https://{$server}/banner.png">
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<title>{$h1} {$realName}</title>
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<style>
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body { margin:0; padding: 0; font-family:sans-serif; }
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@media screen and (max-width: 800px) { body { width: 100%; }}
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@media screen and (min-width: 799px) { body { width: 800px; margin: 0 auto; }}
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address { font-style: normal; }
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img { max-width: 50%; }
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.h-feed { margin:auto; width: 100%; }
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.h-feed > header { text-align: center; margin: 0 auto; }
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.h-feed .banner { text-align: center; margin:0 auto; max-width: 650px; }
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.h-feed > h1, .h-feed > h2 { margin-top: 10px; margin-bottom: 0; }
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||
.h-feed > header > h1:has(span.p-author), h2:has(a.p-nickname) { word-wrap: break-word; max-width: 90%; padding-left:20px; }
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||
.h-feed .u-feature:first-child { margin-top: 10px; margin-bottom: -150px; max-width: 100%;}
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||
.h-feed .u-photo { max-height: 8vw; max-width:100%; min-height: 120px; }
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.h-feed .about { font-size: smaller; background-color: #F5F5F5; padding: 10px; border-top: dotted 1px #808080; border-bottom: dotted 1px #808080; }
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||
.h-feed > ul { padding-left: 0; list-style-type: none; }
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||
.h-feed > ul > li { padding: 10px; border-bottom: dotted 1px #808080; }
|
||
.h-entry { padding-right: 10px; }
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||
.h-entry time { font-weight: bold; }
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||
.h-entry .e-content a { word-wrap: break-word; }
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||
</style>
|
||
</head>
|
||
<body>
|
||
<main class="h-feed">
|
||
<header>
|
||
<div class="banner">
|
||
<img src="banner.png" alt="" class="u-feature"><br>
|
||
<img src="icon.png" alt="icon" class="u-photo">
|
||
</div>
|
||
<address>
|
||
<h1 class="p-name p-author">{$realName}</h1>
|
||
<h2><a class="p-nickname u-url" rel="author" href="https://{$server}/{$username}">@{$rawUsername}@{$server}</a></h2>
|
||
</address>
|
||
<p class="p-summary">{$summary}</p>
|
||
<p>Following: {$totalFollowing} | Followers: {$totalFollowers}</p>
|
||
<div class="about">
|
||
<p><a href="https://gitlab.com/edent/activitypub-single-php-file/">This software is licenced under AGPL 3.0</a>.</p>
|
||
<p>This site is a basic <a href="https://www.w3.org/TR/activitypub/">ActivityPub</a> server designed to be <a href="https://shkspr.mobi/blog/2024/02/activitypub-server-in-a-single-file/">a lightweight educational tool</a>.</p>
|
||
</div>
|
||
</header>
|
||
<ul>
|
||
HTML;
|
||
// Get all the files in the directory
|
||
$message_files = array_reverse( glob( $directories[$directory] . "/*.json") );
|
||
// Keep the most recent 200
|
||
$message_files = array_slice( $message_files, 0, 200 );
|
||
|
||
// Loop through the messages:
|
||
// Remove any which have been updated.
|
||
// Ensure messages are in the right order.
|
||
$messages_ordered = [];
|
||
$messages_ids = [];
|
||
foreach ( $message_files as $message_file ) {
|
||
// Get the contents of the JSON
|
||
$message = json_decode( file_get_contents( $message_file ), true );
|
||
|
||
// Get the ID
|
||
if ( isset( $message["object"]["id"] ) ) {
|
||
$id = $message["object"]["id"];
|
||
} else if ( isset( $message["id"] ) ) {
|
||
$id = $message["id"];
|
||
}
|
||
|
||
// Has this message ID already been seen?
|
||
// If so, it's an older update. Skip displaying it
|
||
if ( !in_array( $id, $messages_ids ) ) {
|
||
$messages_ids[] = $id;
|
||
} else {
|
||
continue;
|
||
}
|
||
|
||
// Sometimes messages are received out of order.
|
||
// This sorts them by their published time or, if there is none, the received time.
|
||
// Use the timestamp of the message. If there is none, use the date in the filename
|
||
if ( isset( $message["published"] ) ) {
|
||
$published = $message["published"];
|
||
} else {
|
||
$segments = explode( "/", explode( "-", $message_file ?? "" )[0]);
|
||
$published_hexstamp = end( $segments );
|
||
$published_time = hexdec( $published_hexstamp );
|
||
$published = date( "c", $published_time );
|
||
|
||
}
|
||
// Place in an array where the key is the timestamp
|
||
$messages_ordered[$published] = $message;
|
||
}
|
||
|
||
// Sort with newest on top
|
||
krsort( $messages_ordered );
|
||
|
||
// HTML is *probably* sanitised by the sender. But let's not risk it, eh?
|
||
// Using the allow-list from https://docs.joinmastodon.org/spec/activitypub/#sanitization
|
||
$allowed_elements = ["p", "span", "br", "a", "del", "pre", "code", "em", "strong", "b", "i", "u", "ul", "ol", "li", "blockquote"];
|
||
|
||
// Print the items in a list
|
||
foreach ( $messages_ordered as $published=>$message ) {
|
||
|
||
// Received messages have an `object` which contains their data.
|
||
// Sent messages *are* their data
|
||
if ( isset( $message["object"] ) ) {
|
||
$object = $message["object"];
|
||
} else {
|
||
$object = $message;
|
||
}
|
||
|
||
if ( isset( $object["id"] ) ) {
|
||
$id = $object["id"];
|
||
$publishedHTML = "<a href=\"{$id}\">{$published}</a>";
|
||
} else {
|
||
$id = "";
|
||
$publishedHTML = $published;
|
||
}
|
||
// For displaying the post's information
|
||
$timeHTML = "<time datetime=\"{$published}\" class=\"u-url\" rel=\"bookmark\">{$publishedHTML}</time>";
|
||
|
||
// Get the actor who authored the message
|
||
if ( isset( $object["attributedTo"] ) ) {
|
||
$actor = $object["attributedTo"];
|
||
} else if ( isset( $message["actor"] ) ) {
|
||
// Usually found in Like and Announce messages
|
||
$actor = $message["actor"];
|
||
} else {
|
||
// Should never happen!
|
||
$actor = "https://example.com/anonymous";
|
||
}
|
||
// Assume that what comes after the final `/` in the URl is the name
|
||
$actorArray = explode( "/", $actor );
|
||
$actorName = end( $actorArray );
|
||
$actorServer = parse_url( $actor, PHP_URL_HOST );
|
||
$actorUsername = "@{$actorName}@{$actorServer}";
|
||
// Make i18n usernames readable and safe.
|
||
$actorName = htmlspecialchars( rawurldecode( $actorName ) );
|
||
$actorHTML = "<a href=\"$actor\">@{$actorName}</a>";
|
||
|
||
// Buttons to interact with a message.
|
||
// By default, just shows a "Follow User" button.
|
||
if ( "read" == $style ) {
|
||
$interactHTML = "<a href=\"/users?account=$actorUsername\">➕</a> ";
|
||
} else {
|
||
$interactHTML = "";
|
||
}
|
||
|
||
// What type of message is this?
|
||
$type = $message["type"];
|
||
|
||
// Render the message according to type
|
||
if ( "Create" == $type || "Update" == $type || "Note" == $type ) {
|
||
// Get the HTML content
|
||
// There is a slight difference between the formatting of sent and received messages
|
||
"Note" == $type ? $content = $message["content"] : $content = $object["content"];
|
||
// Sanitise the HTML
|
||
$content = strip_tags( $content, $allowed_elements );
|
||
|
||
// Is this a reply to something?
|
||
if ( isset( $object["inReplyTo"] ) ) {
|
||
$replyToURl = $object["inReplyTo"];
|
||
$replyTo = "in reply to <a href=\"{$replyToURl}\">$replyToURl</a>";
|
||
} else {
|
||
$replyTo = "";
|
||
}
|
||
|
||
// Has the user has been specifically CC'd?
|
||
if ( isset( $object["cc"] ) ) {
|
||
$reply = in_array( "https://{$server}/{$username}", $object["cc"] );
|
||
} else {
|
||
$reply = false;
|
||
}
|
||
|
||
// Is there is a Content Warning?
|
||
if ( isset( $object["summary"] ) ) {
|
||
$summary = $object["summary"];
|
||
$summary = strip_tags( $summary, $allowed_elements );
|
||
// Hide the content until the user interacts with it.
|
||
$content = "<details><summary>{$summary}</summary>{$content}</details>";
|
||
}
|
||
|
||
// Is there a poll?
|
||
// ActivityPub specification - https://www.w3.org/TR/activitystreams-vocabulary/#questions
|
||
// Mastodon documentation - https://docs.joinmastodon.org/spec/activitypub/#Question
|
||
if ( isset( $object["oneOf"] ) ) {
|
||
$content .= "<h3>Poll Results:</h3>";
|
||
foreach ( $object["oneOf"] as $pollOption ) {
|
||
$pollOptionName = htmlspecialchars( $pollOption["name"] );
|
||
$pollOptionValue = htmlspecialchars( $pollOption["replies"]["totalItems"] );
|
||
|
||
$content .= "{$pollOptionName}: $pollOptionValue<br>";
|
||
}
|
||
}
|
||
if ( isset( $object["anyOf"] ) ) {
|
||
$content .= "<h3>Poll Results</h3>";
|
||
foreach ( $object["anyOf"] as $pollOption ) {
|
||
$pollOptionName = htmlspecialchars( $pollOption["name"] );
|
||
$pollOptionValue = htmlspecialchars( $pollOption["replies"]["totalItems"] );
|
||
|
||
$content .= "{$pollOptionName}: $pollOptionValue<br>";
|
||
}
|
||
}
|
||
|
||
// Add any images
|
||
if ( isset( $object["attachment"] ) ) {
|
||
foreach ( $object["attachment"] as $attachment ) {
|
||
// Only use things which have a MIME Type set
|
||
if ( isset( $attachment["mediaType"] ) ) {
|
||
$mediaURl = $attachment["url"];
|
||
$mime = $attachment["mediaType"];
|
||
// Use the first half of the MIME Type.
|
||
// For example `image/png` or `video/mp4`
|
||
$mediaType = explode( "/", $mime )[0];
|
||
|
||
if ( "image" == $mediaType ) {
|
||
// Get the alt text
|
||
isset( $attachment["name"] ) ? $alt = $attachment["name"] : $alt = "";
|
||
$content .= "<img src='{$mediaURl}' alt='{$alt}'>";
|
||
} else if ( "video" == $mediaType ) {
|
||
$content .= "<video controls><source src='{$mediaURl}' type='{$mime}'></video>";
|
||
}else if ( "audio" == $mediaType ) {
|
||
$content .= "<audio controls src='{$mediaURl}' type='{$mime}'></audio>";
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// What sort of message is this?
|
||
switch ( $type ) {
|
||
case "Create":
|
||
case "Note":
|
||
$verb = "wrote";
|
||
break;
|
||
case "Update":
|
||
$verb = "updated";
|
||
break;
|
||
default:
|
||
$verb = "said";
|
||
break;
|
||
}
|
||
|
||
// Add some interaction buttons
|
||
$interactHTML .= "<a href=\"/write?reply=$id\">↩️</a> " .
|
||
"<a href=\"/write?announce=$id\">🔁</a> " .
|
||
"<a href=\"/write?like=$id\">⚝</a> ";
|
||
|
||
if ( $reply ) {
|
||
// Highlight that this is a reply
|
||
$messageHTML = "<mark>{$timeHTML} {$actorHTML} {$verb} {$replyTo}:</mark> <blockquote class=\"e-content\">{$content}</blockquote>";
|
||
} else {
|
||
$messageHTML = "{$timeHTML} {$actorHTML} {$verb} {$replyTo}: <blockquote class=\"e-content\">{$content}</blockquote>";
|
||
}
|
||
|
||
} else if ( "Follow" == $type ) {
|
||
$messageHTML = "<mark>{$timeHTML} {$actorHTML} followed you</mark>";
|
||
} else if ( "Like" == $type ) {
|
||
$object = $message["object"];
|
||
$objectHTML = "<a href=\"$object\">{$object}</a>";
|
||
$messageHTML = "{$timeHTML} {$actorHTML} liked {$objectHTML}";
|
||
} else if ( "Announce" == $type ) {
|
||
$object = $message["object"];
|
||
$objectHTML = "<a href=\"$object\">{$object}</a>";
|
||
$messageHTML = "{$timeHTML} {$actorHTML} boosted {$objectHTML}";
|
||
}
|
||
|
||
echo "<li><article class=\"h-entry\">{$messageHTML}<br>{$interactHTML}</article></li>";
|
||
}
|
||
echo <<< HTML
|
||
</ul>
|
||
</main>
|
||
</body>
|
||
</html>
|
||
HTML;
|
||
die();
|
||
}
|
||
|
||
// User Interface for Writing:
|
||
// This creates a basic HTML form. Type in your message and your password. It then POSTs the data to the `/send` endpoint.
|
||
function write() {
|
||
if ( isset( $_GET["announce"] ) && filter_var( $_GET["announce"], FILTER_VALIDATE_URL ) ) {
|
||
$announceURl = $_GET["announce"];
|
||
} else {
|
||
$announceURl = "";
|
||
}
|
||
|
||
if ( isset( $_GET["like"] ) && filter_var( $_GET["like"], FILTER_VALIDATE_URL ) ) {
|
||
$likeURl = $_GET["like"];
|
||
} else {
|
||
$likeURl = "";
|
||
}
|
||
|
||
if ( isset( $_GET["reply"] ) && filter_var( $_GET["reply"], FILTER_VALIDATE_URL ) ) {
|
||
$replyURl = $_GET["reply"];
|
||
} else {
|
||
$replyURl = "";
|
||
}
|
||
echo <<< HTML
|
||
<!DOCTYPE html>
|
||
<html lang="en-GB">
|
||
<head>
|
||
<meta charset="UTF-8">
|
||
<title>Send Message</title>
|
||
<style>
|
||
*{font-family:sans-serif;font-size:1.1em;}
|
||
</style>
|
||
</head>
|
||
<body>
|
||
<fieldset>
|
||
<legend>Send a message</legend>
|
||
<form action="/action/send" method="post" enctype="multipart/form-data">
|
||
<input type="hidden" id="type" name="type" value="Create">
|
||
<label for="content">Your message:</label><br>
|
||
<textarea id="content" name="content" rows="5" cols="32"></textarea><br>
|
||
<label for="inReplyTo">Reply to URl:</label>
|
||
<input type="url" name="inReplyTo" id="inReplyTo" size="32" value="{$replyURl}"><br>
|
||
<label for="image">Attach an image</label><br>
|
||
<input type="file" name="image" id="image" accept="image/*"><br>
|
||
<label for="alt">Alt Text</label>
|
||
<input type="text" name="alt" id="alt" size="32" /><br>
|
||
<label for="password">Password</label><br>
|
||
<input type="password" name="password" id="password" size="32"><br><br>
|
||
<input type="submit" value="Post Message">
|
||
</form>
|
||
</fieldset>
|
||
<fieldset>
|
||
<legend>Like a post</legend>
|
||
<form action="/send" method="post" enctype="multipart/form-data">
|
||
<input type="hidden" id="type" name="type" value="Like">
|
||
<label for="postURl">URl of post to like:</label>
|
||
<input type="url" name="postURl" id="postURl" size="32" value="{$likeURl}"><br>
|
||
<label for="password">Password</label><br>
|
||
<input type="password" name="password" id="password" size="32"><br><br>
|
||
<input type="submit" value="Like the message">
|
||
</form>
|
||
</fieldset>
|
||
<fieldset>
|
||
<legend>Boost a post</legend>
|
||
<form action="/send" method="post" enctype="multipart/form-data">
|
||
<input type="hidden" id="type" name="type" value="Announce">
|
||
<label for="postURl">URl of post to boost:</label>
|
||
<input type="url" name="postURl" id="postURl" size="32" value="{$announceURl}"><br>
|
||
<label for="password">Password</label><br>
|
||
<input type="password" name="password" id="password" size="32"><br><br>
|
||
<input type="submit" value="Boost the Message">
|
||
</form>
|
||
</fieldset>
|
||
</body>
|
||
</html>
|
||
HTML;
|
||
die();
|
||
}
|
||
|
||
// Send Endpoint:
|
||
// This takes the submitted message and checks the password is correct.
|
||
// It reads all the followers' data in `data/followers`.
|
||
// It constructs a list of shared inboxes and unique inboxes.
|
||
// It sends the message to every server that is following this account.
|
||
function send() {
|
||
global $password, $server, $username, $key_private, $directories;
|
||
|
||
// Does the posted password match the stored password?
|
||
if( $password != $_POST["password"] ) { die(); }
|
||
|
||
// What sort of message is being sent?
|
||
$type = $_POST["type"];
|
||
|
||
// Likes and Announces have an identical message structure
|
||
if ( "Like" == $type || "Announce" == $type ) {
|
||
// Was a URl sent?
|
||
if ( isset( $_POST["postURl"] ) && filter_var( $_POST["postURl"], FILTER_VALIDATE_URL ) ) {
|
||
$postURl = $_POST["postURl"];
|
||
} else {
|
||
echo "No valid URl sent.";
|
||
die();
|
||
}
|
||
|
||
if ( "Like" == $type ) {
|
||
// The message will need to be sent to the inbox of the author of the message
|
||
$inbox_single = getInboxFromMessageURl( $postURl );
|
||
}
|
||
|
||
// Outgoing Message ID
|
||
$guid = uuid();
|
||
|
||
// Construct the Message
|
||
$message = [
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/posts/{$guid}.json",
|
||
"type" => $type,
|
||
"actor" => "https://{$server}/{$username}",
|
||
"published"=> date( "c" ),
|
||
"object" => $postURl
|
||
];
|
||
|
||
// Announces are sent to an audience
|
||
// The audience is public and it is sent to all followers
|
||
// TODO: Let the original poster know we boosted them
|
||
if ( $type == "Announce" ) {
|
||
$message = array_merge( $message,
|
||
array(
|
||
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
|
||
"cc" => ["https://{$server}/followers"])
|
||
);
|
||
}
|
||
|
||
// Construct the Note
|
||
// This is for saving in the logs
|
||
$note = $message;
|
||
|
||
} else if ( $type == "Create" ) {
|
||
// Get the posted content
|
||
$content = $_POST["content"];
|
||
|
||
// Is this a reply?
|
||
if ( isset( $_POST["inReplyTo"] ) && filter_var( $_POST["inReplyTo"], FILTER_VALIDATE_URL ) ) {
|
||
$inReplyTo = $_POST["inReplyTo"];
|
||
} else {
|
||
$inReplyTo = null;
|
||
}
|
||
|
||
// Process the content into HTML to get hashtags etc
|
||
list( "HTML" => $content, "TagArray" => $tags ) = process_content( $content );
|
||
|
||
// Is there an image attached?
|
||
if ( isset( $_FILES['image']['tmp_name'] ) && ( "" != $_FILES['image']['tmp_name'] ) ) {
|
||
// Get information about the image
|
||
$image = $_FILES['image']['tmp_name'];
|
||
$image_info = getimagesize( $image );
|
||
$image_ext = image_type_to_extension( $image_info[2] );
|
||
$image_mime = $image_info["mime"];
|
||
|
||
// Files are stored according to their hash
|
||
// A hash of "abc123" is stored in "/images/abc123.jpg"
|
||
$sha1 = sha1_file( $image );
|
||
$image_full_path = $directories["images"] . "/{$sha1}.{$image_ext}";
|
||
|
||
// Move media to the correct location
|
||
move_uploaded_file( $image, $image_full_path );
|
||
|
||
// Get the alt text
|
||
if ( isset( $_POST["alt"] ) ) {
|
||
$alt = $_POST["alt"];
|
||
} else {
|
||
$alt = "";
|
||
}
|
||
|
||
// Construct the attachment value for the post
|
||
$attachment = array( [
|
||
"type" => "Image",
|
||
"mediaType" => "{$image_mime}",
|
||
"url" => "https://{$server}/{$image_full_path}",
|
||
"name" => $alt
|
||
] );
|
||
} else {
|
||
$attachment = [];
|
||
}
|
||
|
||
// Current time - ISO8601
|
||
$timestamp = date( "c" );
|
||
|
||
// Outgoing Message ID
|
||
$guid = uuid();
|
||
|
||
// Construct the Note
|
||
// `contentMap` is used to prevent unnecessary "translate this post" pop ups
|
||
// hardcoded to English
|
||
$note = [
|
||
"@context" => array(
|
||
"https://www.w3.org/ns/activitystreams"
|
||
),
|
||
"id" => "https://{$server}/posts/{$guid}.json",
|
||
"type" => "Note",
|
||
"published" => $timestamp,
|
||
"attributedTo" => "https://{$server}/{$username}",
|
||
"inReplyTo" => $inReplyTo,
|
||
"content" => $content,
|
||
"contentMap" => ["en" => $content],
|
||
"to" => ["https://www.w3.org/ns/activitystreams#Public"],
|
||
"tag" => $tags,
|
||
"attachment" => $attachment
|
||
];
|
||
|
||
// Construct the Message
|
||
// The audience is public and it is sent to all followers
|
||
$message = [
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/posts/{$guid}.json",
|
||
"type" => "Create",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"to" => [
|
||
"https://www.w3.org/ns/activitystreams#Public"
|
||
],
|
||
"cc" => [
|
||
"https://{$server}/followers"
|
||
],
|
||
"object" => $note
|
||
];
|
||
}
|
||
|
||
// Save the permalink
|
||
$note_json = json_encode( $note );
|
||
file_put_contents( $directories["posts"] . "/{$guid}.json", print_r( $note_json, true ) );
|
||
|
||
// Is this message going to one user? (Usually a Like)
|
||
if ( isset( $inbox_single ) ) {
|
||
$messageSent = sentMessageToSingle( $inbox_single, $message );
|
||
} else { // Send to all the user's followers
|
||
$messageSent = sendMessageToFollowers( $message );
|
||
}
|
||
|
||
// Render the JSON so the user can see the POST has worked
|
||
if ( $messageSent ) {
|
||
header( "Location: https://{$server}/posts/{$guid}.json" );
|
||
die();
|
||
} else {
|
||
echo "ERROR!";
|
||
die();
|
||
}
|
||
}
|
||
|
||
// POST a signed message to a single inbox
|
||
function sentMessageToSingle( $inbox, $message ) {
|
||
global $directories;
|
||
|
||
$inbox_host = parse_url( $inbox, PHP_URL_HOST );
|
||
$inbox_path = parse_url( $inbox, PHP_URL_PATH );
|
||
|
||
// Generate the signed headers
|
||
$headers = generate_signed_headers( $message, $inbox_host, $inbox_path, "POST" );
|
||
|
||
// POST the message and header to the requester's inbox
|
||
$ch = curl_init( $inbox );
|
||
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
|
||
curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, "POST" );
|
||
curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $message ) );
|
||
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
|
||
curl_setopt( $ch, CURLOPT_USERAGENT, USERAGENT );
|
||
curl_exec( $ch );
|
||
|
||
// Check for errors
|
||
if( curl_errno( $ch ) ) {
|
||
$timestamp = ( new DateTime() )->format( DATE_RFC3339_EXTENDED );
|
||
file_put_contents( $directories["logs"] . "/{$timestamp}.Error.txt", curl_error( $ch ) );
|
||
return false;
|
||
}
|
||
curl_close( $ch );
|
||
return true;
|
||
}
|
||
|
||
// POST a signed message to the inboxes of all followers
|
||
function sendMessageToFollowers( $message ) {
|
||
global $directories;
|
||
// Read existing followers
|
||
$followers = glob( $directories["followers"] . "/*.json" );
|
||
|
||
// Get all the inboxes
|
||
$inboxes = [];
|
||
foreach ( $followers as $follower ) {
|
||
// Get the data about the follower
|
||
$follower_info = json_decode( file_get_contents( $follower ), true );
|
||
|
||
// Some servers have "Shared inboxes"
|
||
// If you have lots of followers on a single server, you only need to send the message once.
|
||
if( isset( $follower_info["endpoints"]["sharedInbox"] ) ) {
|
||
$sharedInbox = $follower_info["endpoints"]["sharedInbox"];
|
||
if ( !in_array( $sharedInbox, $inboxes ) ) {
|
||
$inboxes[] = $sharedInbox;
|
||
}
|
||
} else {
|
||
// If not, use the individual inbox
|
||
$inbox = $follower_info["inbox"];
|
||
if ( !in_array( $inbox, $inboxes ) ) {
|
||
$inboxes[] = $inbox;
|
||
}
|
||
}
|
||
}
|
||
|
||
// Prepare to use the multiple cURL handle
|
||
// This makes it more efficient to send many simultaneous messages
|
||
$mh = curl_multi_init();
|
||
|
||
// Loop through all the inboxes of the followers
|
||
// Each server needs its own cURL handle
|
||
// Each POST to an inbox needs to be signed separately
|
||
foreach ( $inboxes as $inbox ) {
|
||
|
||
$inbox_host = parse_url( $inbox, PHP_URL_HOST );
|
||
$inbox_path = parse_url( $inbox, PHP_URL_PATH );
|
||
|
||
// Generate the signed headers
|
||
$headers = generate_signed_headers( $message, $inbox_host, $inbox_path, "POST" );
|
||
|
||
// POST the message and header to the requester's inbox
|
||
$ch = curl_init( $inbox );
|
||
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
|
||
curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, "POST" );
|
||
curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $message ) );
|
||
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
|
||
curl_setopt( $ch, CURLOPT_USERAGENT, USERAGENT );
|
||
|
||
// Add the handle to the multi-handle
|
||
curl_multi_add_handle( $mh, $ch );
|
||
}
|
||
|
||
// Execute the multi-handle
|
||
do {
|
||
$status = curl_multi_exec( $mh, $active );
|
||
if ( $active ) {
|
||
curl_multi_select( $mh );
|
||
}
|
||
} while ( $active && $status == CURLM_OK );
|
||
|
||
// Close the multi-handle
|
||
curl_multi_close( $mh );
|
||
|
||
return true;
|
||
}
|
||
|
||
// Content can be plain text. But to add clickable links and hashtags, it needs to be turned into HTML.
|
||
// Tags are also included separately in the note
|
||
function process_content( $content ) {
|
||
global $server;
|
||
|
||
// Convert any URls into hyperlinks
|
||
$link_pattern = '/\bhttps?:\/\/\S+/iu'; // Sloppy regex
|
||
$replacement = function ( $match ) {
|
||
$url = htmlspecialchars( $match[0], ENT_QUOTES, "UTF-8" );
|
||
return "<a href=\"$url\">$url</a>";
|
||
};
|
||
$content = preg_replace_callback( $link_pattern, $replacement, $content );
|
||
|
||
// Get any hashtags
|
||
$hashtags = [];
|
||
$hashtag_pattern = '/(?:^|\s)\#(\w+)/'; // Beginning of string, or whitespace, followed by #
|
||
preg_match_all( $hashtag_pattern, $content, $hashtag_matches );
|
||
foreach ( $hashtag_matches[1] as $match ) {
|
||
$hashtags[] = $match;
|
||
}
|
||
|
||
// Construct the tag value for the note object
|
||
$tags = [];
|
||
foreach ( $hashtags as $hashtag ) {
|
||
$tags[] = array(
|
||
"type" => "Hashtag",
|
||
"name" => "#{$hashtag}",
|
||
);
|
||
}
|
||
|
||
// Add HTML links for hashtags into the text
|
||
// Todo: Make these links do something.
|
||
$content = preg_replace(
|
||
$hashtag_pattern,
|
||
" <a href='https://{$server}/tag/$1'>#$1</a>",
|
||
$content
|
||
);
|
||
|
||
// Detect user mentions
|
||
$usernames = [];
|
||
$usernames_pattern = '/@(\S+)@(\S+)/'; // This is a *very* sloppy regex
|
||
preg_match_all( $usernames_pattern, $content, $usernames_matches );
|
||
foreach ( $usernames_matches[0] as $match ) {
|
||
$usernames[] = $match;
|
||
}
|
||
|
||
// Construct the mentions value for the note object
|
||
// This goes in the generic "tag" property
|
||
// TODO: Add this to the CC field & appropriate inbox
|
||
foreach ( $usernames as $username ) {
|
||
list( , $user, $domain ) = explode( "@", $username );
|
||
$tags[] = array(
|
||
"type" => "Mention",
|
||
"href" => "https://{$domain}/@{$user}",
|
||
"name" => "{$username}"
|
||
);
|
||
|
||
// Add HTML links to usernames
|
||
$username_link = "<a href=\"https://{$domain}/@{$user}\">$username</a>";
|
||
$content = str_replace( $username, $username_link, $content );
|
||
}
|
||
|
||
// Construct HTML breaks from carriage returns and line breaks
|
||
$linebreak_patterns = array( "\r\n", "\r", "\n" ); // Variations of line breaks found in raw text
|
||
$content = str_replace( $linebreak_patterns, "<br/>", $content );
|
||
|
||
// Construct the content
|
||
$content = "<p>{$content}</p>";
|
||
|
||
return [
|
||
"HTML" => $content,
|
||
"TagArray" => $tags
|
||
];
|
||
}
|
||
|
||
// When given the URl of a post, this looks up the post, finds the user, then returns their inbox or shared inbox
|
||
function getInboxFromMessageURl( $url ) {
|
||
|
||
// Get details about the message
|
||
$messageData = getDataFromURl( $url );
|
||
|
||
// The author is the user who the message is attributed to
|
||
if ( isset ( $messageData["attributedTo"] ) && filter_var( $messageData["attributedTo"], FILTER_VALIDATE_URL) ) {
|
||
$profileData = getDataFromURl( $messageData["attributedTo"] );
|
||
} else {
|
||
return null;
|
||
}
|
||
|
||
// Get the shared inbox or personal inbox
|
||
if( isset( $profileData["endpoints"]["sharedInbox"] ) ) {
|
||
$inbox = $profileData["endpoints"]["sharedInbox"];
|
||
} else {
|
||
// If not, use the individual inbox
|
||
$inbox = $profileData["inbox"];
|
||
}
|
||
|
||
// Return the destination inbox if it is valid
|
||
if ( filter_var( $inbox, FILTER_VALIDATE_URL) ) {
|
||
return $inbox;
|
||
} else {
|
||
return null;
|
||
}
|
||
}
|
||
|
||
// GET a request to a URl and returns structured data
|
||
function getDataFromURl ( $url ) {
|
||
// Check this is a valid https address
|
||
if(
|
||
( filter_var( $url, FILTER_VALIDATE_URL) != true) ||
|
||
( parse_url( $url, PHP_URL_SCHEME ) != "https" )
|
||
) { die(); }
|
||
|
||
// Split the URL
|
||
$url_host = parse_url( $url, PHP_URL_HOST );
|
||
$url_path = parse_url( $url, PHP_URL_PATH );
|
||
|
||
// Generate signed headers for this request
|
||
$headers = generate_signed_headers( null, $url_host, $url_path, "GET" );
|
||
|
||
// Set cURL options
|
||
$ch = curl_init( $url );
|
||
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
|
||
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
|
||
curl_setopt( $ch, CURLOPT_USERAGENT, USERAGENT );
|
||
|
||
// Execute the cURL session
|
||
$urlJSON = curl_exec( $ch );
|
||
|
||
// Check for errors
|
||
if (curl_errno( $ch )) {
|
||
// Handle cURL error
|
||
die();
|
||
}
|
||
|
||
// Close cURL session
|
||
curl_close( $ch );
|
||
|
||
return json_decode( $urlJSON, true );
|
||
}
|
||
|
||
// The Outbox contains a date-ordered list (newest first) of all the user's posts
|
||
// This is optional.
|
||
function outbox() {
|
||
global $server, $username, $directories;
|
||
|
||
// Get all posts
|
||
$posts = array_reverse( glob( $directories["posts"] . "/*.json") );
|
||
// Number of posts
|
||
$totalItems = count( $posts );
|
||
// Create an ordered list
|
||
$orderedItems = [];
|
||
foreach ( $posts as $post ) {
|
||
$orderedItems[] = array(
|
||
"type" => "Create",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => "https://{$server}/{$post}"
|
||
);
|
||
}
|
||
|
||
// Create User's outbox
|
||
$outbox = array(
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/outbox",
|
||
"type" => "OrderedCollection",
|
||
"totalItems" => $totalItems,
|
||
"summary" => "All the user's posts",
|
||
"orderedItems" => $orderedItems
|
||
);
|
||
|
||
// Render the page
|
||
header( "Content-Type: application/activity+json" );
|
||
echo json_encode( $outbox );
|
||
die();
|
||
}
|
||
|
||
// This creates a UI for the user to follow another user
|
||
function users() {
|
||
if ( isset( $_GET["account"] ) ) {
|
||
$accountURl = htmlspecialchars( $_GET["account"] );
|
||
} else {
|
||
$accountURl = "";
|
||
}
|
||
echo <<< HTML
|
||
<!DOCTYPE html>
|
||
<html lang="en-GB">
|
||
<head>
|
||
<meta charset="UTF-8">
|
||
<title>Follow</title>
|
||
<style>
|
||
*{font-family:sans-serif;font-size:1.1em;}
|
||
</style>
|
||
</head>
|
||
<body>
|
||
<form action="/action/users" method="post" enctype="multipart/form-data">
|
||
<label for="user">User:</label>
|
||
<input name="user" id="user" type="text" size="32" placeholder="@user@example.com" value="{$accountURl}"><br>
|
||
<label for="action">action</label><br>
|
||
<select name="action" id="action">
|
||
<option value="">--Please choose an option--</option>
|
||
<option value="Follow">Follow</option>
|
||
<option value="Unfollow">Unfollow</option>
|
||
<option value="Block">Block</option>
|
||
<option value="Unblock">Unblock</option>
|
||
</select><br>
|
||
<label for="password">Password</label><br>
|
||
<input name="password" id="password" type="password" size="32"><br>
|
||
<input type="submit" value="Send User Request">
|
||
</form>
|
||
</body>
|
||
</html>
|
||
HTML;
|
||
die();
|
||
}
|
||
|
||
// This receives a request to follow an external user
|
||
// It looks up the external user's details
|
||
// Then it sends a follow request
|
||
// If the request is accepted, it saves the details in `data/following/` as a JSON file
|
||
function action_users() {
|
||
global $password, $server, $username, $key_private, $directories;
|
||
|
||
// Does the posted password match the stored password?
|
||
if( $password != $_POST["password"] ) { echo "Wrong Password!"; die(); }
|
||
|
||
// Get the posted content
|
||
$user = $_POST["user"];
|
||
$action = $_POST["action"];
|
||
|
||
// Is this a valid action?
|
||
if ( match( $action ) {
|
||
"Follow", "Unfollow", "Block", "Unblock" => false,
|
||
default => true,
|
||
} ) {
|
||
// Discard it, no further processing.
|
||
echo "{$action} not supported";
|
||
die();
|
||
}
|
||
|
||
// Split the user (@user@example.com) into username and server
|
||
list( , $follow_name, $follow_server ) = explode( "@", $user );
|
||
|
||
// Get the Webfinger
|
||
// This request does not always need to be signed, but safest to do so anyway.
|
||
$webfingerURl = "https://{$follow_server}/.well-known/webfinger?resource=acct:{$follow_name}@{$follow_server}";
|
||
$webfinger = getDataFromURl( $webfingerURl );
|
||
|
||
// Get the link to the user
|
||
foreach( $webfinger["links"] as $link ) {
|
||
if ( "self" == $link["rel"] ) {
|
||
$profileURl = $link["href"];
|
||
}
|
||
}
|
||
if ( !isset( $profileURl ) ) { echo "No profile" . print_r( $webfinger, true ); die(); }
|
||
|
||
// Get the user's details
|
||
$profileData = getDataFromURl( $profileURl );
|
||
|
||
// Get the user's inbox
|
||
$profileInbox = $profileData["inbox"];
|
||
|
||
// Create a user request
|
||
$guid = uuid();
|
||
|
||
// Different user actions have subtly different messages to send.
|
||
if ( "Follow" == $action ) {
|
||
$message = [
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/{$guid}",
|
||
"type" => "Follow",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => $profileURl
|
||
];
|
||
} else if ( "Unfollow" == $action ) {
|
||
$message = [
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/{$guid}",
|
||
"type" => "Undo",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => array(
|
||
//"id" => null, // Should be the original ID if possible, but not necessary https://www.w3.org/wiki/ActivityPub/Primer/Referring_to_activities
|
||
"type" => "Follow",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => $profileURl
|
||
)
|
||
];
|
||
} else if ( "Block" == $action ) {
|
||
$message = [
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/{$guid}",
|
||
"type" => "Block",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => $profileURl,
|
||
"to" => $profileURl
|
||
];
|
||
} else if ( "Unblock" == $action ) {
|
||
$message = [
|
||
"@context" => "https://www.w3.org/ns/activitystreams",
|
||
"id" => "https://{$server}/{$guid}",
|
||
"type" => "Undo",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => array(
|
||
//"id" => null, // Should be the original ID if possible, but not necessary https://www.w3.org/wiki/ActivityPub/Primer/Referring_to_activities
|
||
"type" => "Block",
|
||
"actor" => "https://{$server}/{$username}",
|
||
"object" => $profileURl
|
||
)
|
||
];
|
||
}
|
||
|
||
// Sign & send the request
|
||
sentMessageToSingle( $profileInbox, $message );
|
||
|
||
if ( "Follow" == $action ) {
|
||
// Save the user's details
|
||
$following_filename = urlencode( $profileURl );
|
||
file_put_contents( $directories["following"] . "/{$following_filename}.json", json_encode( $profileData ) );
|
||
|
||
// Render the JSON so the user can see the POST has worked
|
||
header( "Location: https://{$server}/data/following/" . urlencode( $following_filename ) . ".json" );
|
||
} else if ( "Block" == $action || "Unfollow" == $action ) {
|
||
// Delete the user if they exist in the following directory.
|
||
$following_filename = urlencode( $profileURl );
|
||
unlink( $directories["following"] . "/{$following_filename}.json" );
|
||
|
||
// Let the user know it worked
|
||
echo "{$user} {$action}ed!";
|
||
} else if ( "Unblock" == $action ) {
|
||
// Let the user know it worked
|
||
echo "{$user} {$action}ed!";
|
||
}
|
||
die();
|
||
}
|
||
|
||
// Verify the signature sent with the message.
|
||
// This is optional
|
||
// It is very confusing
|
||
function verifyHTTPSignature() {
|
||
global $input, $body, $server, $directories;
|
||
|
||
// Get the headers send with the request
|
||
$headers = getallheaders();
|
||
// Ensure the header keys match the format expected by the signature
|
||
$headers = array_change_key_case( $headers, CASE_LOWER );
|
||
|
||
// Validate the timestamp is within ±30 seconds
|
||
if ( !isset( $headers["date"] ) ) { return null; } // No date set
|
||
$dateHeader = $headers["date"];
|
||
$headerDatetime = DateTime::createFromFormat('D, d M Y H:i:s T', $dateHeader);
|
||
$currentDatetime = new DateTime();
|
||
|
||
// Calculate the time difference in seconds
|
||
$timeDifference = abs( $currentDatetime->getTimestamp() - $headerDatetime->getTimestamp() );
|
||
if ( $timeDifference > 30 ) {
|
||
// Write a log detailing the error
|
||
$timestamp = ( new DateTime() )->format( DATE_RFC3339_EXTENDED );
|
||
// Filename for the log
|
||
$filename = "{$timestamp}.Signature.Time_Failure.txt";
|
||
|
||
// Save headers and request data to the timestamped file in the logs directory
|
||
file_put_contents( $directories["logs"] . "/{$filename}",
|
||
"Original Date:\n" . print_r( $dateHeader, true ) . "\n" .
|
||
"Local Date:\n" . print_r( $currentDatetime->format('D, d M Y H:i:s T'), true ) . "\n"
|
||
);
|
||
return false;
|
||
}
|
||
|
||
// Validate the Digest
|
||
// It is the hash of the raw input string, in binary, encoded as base64.
|
||
$digestString = $headers["digest"];
|
||
|
||
// Usually in the form `SHA-256=Ofv56Jm9rlowLR9zTkfeMGLUG1JYQZj0up3aRPZgT0c=`
|
||
// The Base64 encoding may have multiple `=` at the end. So split this at the first `=`
|
||
$digestData = explode( "=", $digestString, 2 );
|
||
$digestAlgorithm = $digestData[0];
|
||
$digestHash = $digestData[1];
|
||
|
||
// There might be many different hashing algorithms
|
||
// TODO: Find a way to transform these automatically
|
||
// See https://github.com/superseriousbusiness/gotosocial/issues/1186#issuecomment-1976166659 and https://github.com/snarfed/bridgy-fed/issues/430 for hs2019
|
||
if ( "SHA-256" == $digestAlgorithm || "hs2019" == $digestAlgorithm ) {
|
||
$digestAlgorithm = "sha256";
|
||
} else if ( "SHA-512" == $digestAlgorithm ) {
|
||
$digestAlgorithm = "sha512";
|
||
}
|
||
|
||
// Manually calculate the digest based on the data sent
|
||
$digestCalculated = base64_encode( hash( $digestAlgorithm, $input, true ) );
|
||
|
||
// Does our calculation match what was sent?
|
||
if ( !( $digestCalculated == $digestHash ) ) {
|
||
// Write a log detailing the error
|
||
$timestamp = ( new DateTime() )->format( DATE_RFC3339_EXTENDED );
|
||
// Filename for the log
|
||
$filename = "{$timestamp}.Signature.Digest_Failure.txt";
|
||
|
||
// Save headers and request data to the timestamped file in the logs directory
|
||
file_put_contents( $directories["logs"] . "/{$filename}",
|
||
"Original Input:\n" . print_r( $input, true ) . "\n" .
|
||
"Original Digest:\n" . print_r( $digestString, true ) . "\n" .
|
||
"Calculated Digest:\n" . print_r( $digestCalculated, true ) . "\n"
|
||
);
|
||
return false;
|
||
}
|
||
|
||
// Examine the signature
|
||
$signatureHeader = $headers["signature"];
|
||
|
||
// Extract key information from the Signature header
|
||
$signatureParts = [];
|
||
// Converts 'a=b,c=d e f' into ["a"=>"b", "c"=>"d e f"]
|
||
// word="text"
|
||
preg_match_all('/(\w+)="([^"]+)"/', $signatureHeader, $matches);
|
||
foreach ( $matches[1] as $index => $key ) {
|
||
$signatureParts[$key] = $matches[2][$index];
|
||
}
|
||
|
||
// Manually reconstruct the header string
|
||
$signatureHeaders = explode(" ", $signatureParts["headers"] );
|
||
$signatureString = "";
|
||
foreach ( $signatureHeaders as $signatureHeader ) {
|
||
if ( "(request-target)" == $signatureHeader ) {
|
||
$method = strtolower( $_SERVER["REQUEST_METHOD"] );
|
||
$target = $_SERVER["REQUEST_URI"];
|
||
$signatureString .= "(request-target): {$method} {$target}\n";
|
||
} else if ( "host" == $signatureHeader ) {
|
||
$host = strtolower( $_SERVER["HTTP_HOST"] );
|
||
$signatureString .= "host: {$host}\n";
|
||
} else {
|
||
$signatureString .= "{$signatureHeader}: " . $headers[$signatureHeader] . "\n";
|
||
}
|
||
}
|
||
|
||
// Remove trailing newline
|
||
$signatureString = trim( $signatureString );
|
||
|
||
// Get the Public Key
|
||
// The link to the key might be sent with the body, but is always sent in the Signature header.
|
||
$publicKeyURL = $signatureParts["keyId"];
|
||
|
||
// This is usually in the form `https://example.com/user/username#main-key`
|
||
// This is to differentiate if the user has multiple keys
|
||
// TODO: Check the actual key
|
||
|
||
$userData = getDataFromURl( $publicKeyURL );
|
||
$publicKey = $userData["publicKey"]["publicKeyPem"];
|
||
|
||
// Get the remaining parts
|
||
$signature = base64_decode( $signatureParts["signature"] );
|
||
$algorithm = $signatureParts["algorithm"];
|
||
|
||
// There might be many different signing algorithms
|
||
// TODO: Find a way to transform these automatically
|
||
// See https://github.com/superseriousbusiness/gotosocial/issues/1186#issuecomment-1976166659 and https://github.com/snarfed/bridgy-fed/issues/430 for hs2019
|
||
if ( "hs2019" == $algorithm ) {
|
||
$algorithm = "sha256";
|
||
}
|
||
|
||
// Finally! Calculate whether the signature is valid
|
||
// Returns 1 if verified, 0 if not, false or -1 if an error occurred
|
||
$verified = openssl_verify(
|
||
$signatureString,
|
||
$signature,
|
||
$publicKey,
|
||
$algorithm
|
||
);
|
||
|
||
// Convert to boolean
|
||
if ( $verified === 1 ) {
|
||
$verified = true;
|
||
} elseif ( $verified === 0 ) {
|
||
$verified = false;
|
||
} else {
|
||
$verified = null;
|
||
}
|
||
|
||
// Write a log detailing the signature verification process
|
||
$timestamp = ( new DateTime() )->format( DATE_RFC3339_EXTENDED );
|
||
// Filename for the log
|
||
$filename = "{$timestamp}.Signature.". json_encode( $verified ) . ".txt";
|
||
|
||
// Save headers and request data to the timestamped file in the logs directory
|
||
file_put_contents( $directories["logs"] . "/{$filename}",
|
||
"Original Body:\n" . print_r( $body, true ) . "\n\n" .
|
||
"Original Headers:\n" . print_r( $headers, true ) . "\n\n" .
|
||
"Signature Headers:\n" . print_r( $signatureHeaders, true ) . "\n\n" .
|
||
"Calculated signatureString:\n" . print_r( $signatureString, true ) . "\n\n" .
|
||
"Calculated algorithm:\n" . print_r( $algorithm, true ) . "\n\n" .
|
||
"publicKeyURL:\n" . print_r( $publicKeyURL, true ) . "\n\n" .
|
||
"publicKey:\n" . print_r( $publicKey, true ) . "\n"
|
||
);
|
||
|
||
return $verified;
|
||
}
|
||
|
||
// The NodeInfo Protocol is used to identify servers.
|
||
// It is looked up with `example.com/.well-known/nodeinfo`
|
||
// See https://nodeinfo.diaspora.software/
|
||
function wk_nodeinfo() {
|
||
global $server;
|
||
|
||
$nodeinfo = array(
|
||
"links" => array(
|
||
array(
|
||
"rel" => "self",
|
||
"type" => "http://nodeinfo.diaspora.software/ns/schema/2.1",
|
||
"href" => "https://{$server}/nodeinfo/2.1"
|
||
)
|
||
)
|
||
);
|
||
header( "Content-Type: application/json" );
|
||
echo json_encode( $nodeinfo );
|
||
die();
|
||
}
|
||
|
||
// The NodeInfo Protocol is used to identify servers.
|
||
// It is looked up with `example.com/.well-known/nodeinfo` which points to this resource
|
||
// See http://nodeinfo.diaspora.software/docson/index.html#/ns/schema/2.0#$$expand
|
||
function nodeinfo() {
|
||
global $server, $directories;
|
||
|
||
// Get all posts
|
||
$posts = glob( $directories["posts"] . "/*.json") ;
|
||
// Number of posts
|
||
$totalItems = count( $posts );
|
||
|
||
$nodeinfo = array(
|
||
"version" => "2.1", // Version of the schema, not the software
|
||
"software" => array(
|
||
"name" => "Single File ActivityPub Server in PHP",
|
||
"version" => "0.000000001",
|
||
"repository" => "https://gitlab.com/edent/activitypub-single-php-file/"
|
||
),
|
||
"protocols" => array( "activitypub"),
|
||
"services" => array(
|
||
"inbound" => array(),
|
||
"outbound" => array()
|
||
),
|
||
"openRegistrations" => false,
|
||
"usage" => array(
|
||
"users" => array(
|
||
"total" => 1
|
||
),
|
||
"localPosts" => $totalItems
|
||
),
|
||
"metadata"=> array(
|
||
"nodeName" => "activitypub-single-php-file",
|
||
"nodeDescription" => "This is a single PHP file which acts as an extremely basic ActivityPub server.",
|
||
"spdx" => "AGPL-3.0-or-later"
|
||
)
|
||
);
|
||
header( "Content-Type: application/json" );
|
||
echo json_encode( $nodeinfo );
|
||
die();
|
||
}
|
||
|
||
|
||
// "One to stun, two to kill, three to make sure"
|
||
die();
|
||
die();
|
||
die(); |