kopia lustrzana https://github.com/friendica/friendica
163 wiersze
4.9 KiB
PHP
163 wiersze
4.9 KiB
PHP
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<?php
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function post_var($name) {
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return (x($_POST, $name)) ? notags(trim($_POST[$name])) : '';
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}
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function pubsubhubbub_init(&$a) {
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// PuSH subscription must be considered "public" so just block it
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// if public access isn't enabled.
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if (get_config('system', 'block_public')) {
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http_status_exit(403);
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}
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// Subscription request from subscriber
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// https://pubsubhubbub.googlecode.com/git/pubsubhubbub-core-0.4.html#anchor4
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// Example from GNU Social:
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// [hub_mode] => subscribe
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// [hub_callback] => http://status.local/main/push/callback/1
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// [hub_verify] => sync
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// [hub_verify_token] => af11...
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// [hub_secret] => af11...
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// [hub_topic] => http://friendica.local/dfrn_poll/sazius
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if($_SERVER['REQUEST_METHOD'] === 'POST') {
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$hub_mode = post_var('hub_mode');
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$hub_callback = post_var('hub_callback');
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$hub_verify = post_var('hub_verify');
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$hub_verify_token = post_var('hub_verify_token');
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$hub_secret = post_var('hub_secret');
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$hub_topic = post_var('hub_topic');
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// check for valid hub_mode
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if ($hub_mode === 'subscribe') {
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$subscribe = 1;
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} else if ($hub_mode === 'unsubscribe') {
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$subscribe = 0;
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} else {
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logger("pubsubhubbub: invalid hub_mode=$hub_mode, ignoring.");
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http_status_exit(404);
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}
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logger("pubsubhubbub: $hub_mode request from " .
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$_SERVER['REMOTE_ADDR']);
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// get the nick name from the topic, a bit hacky but needed
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$nick = substr(strrchr($hub_topic, "/"), 1);
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if (!$nick) {
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logger('pubsubhubbub: bad hub_topic=$hub_topic, ignoring.');
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http_status_exit(404);
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}
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// fetch user from database given the nickname
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$r = q("SELECT * FROM `user` WHERE `nickname` = '%s'" .
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" AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
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dbesc($nick));
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if(!count($r)) {
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logger('pubsubhubbub: local account not found: ' . $nick);
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http_status_exit(404);
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}
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$owner = $r[0];
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// abort if user's wall is supposed to be private
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if ($r[0]['hidewall']) {
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logger('pubsubhubbub: local user ' . $nick .
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'has chosen to hide wall, ignoring.');
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http_status_exit(403);
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}
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// get corresponding row from contact table
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$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `blocked` = 0" .
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" AND `pending` = 0 LIMIT 1",
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intval($owner['uid']));
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if(!count($r)) {
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logger('pubsubhubbub: contact not found.');
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http_status_exit(404);
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}
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$contact = $r[0];
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// sanity check that topic URLs are the same
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if(!link_compare($hub_topic, $contact['poll'])) {
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logger('pubsubhubbub: hub topic ' . $hub_topic . ' != ' .
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$contact['poll']);
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http_status_exit(404);
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}
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// do subscriber verification according to the PuSH protocol
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$hub_challenge = random_string(40);
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$params = 'hub.mode=' .
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($subscribe == 1 ? 'subscribe' : 'unsubscribe') .
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'&hub.topic=' . urlencode($hub_topic) .
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'&hub.challenge=' . $hub_challenge .
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'&hub.lease_seconds=604800' .
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'&hub.verify_token=' . $hub_verify_token;
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// lease time is hard coded to one week (in seconds)
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// we don't actually enforce the lease time because GNU
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// Social/StatusNet doesn't honour it (yet)
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$body = fetch_url($hub_callback . "?" . $params);
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$ret = $a->get_curl_code();
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// give up if the HTTP return code wasn't a success (2xx)
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if ($ret < 200 || $ret > 299) {
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logger("pubsubhubbub: subscriber verification at $hub_callback ".
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"returned $ret, ignoring.");
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http_status_exit(404);
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}
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// check that the correct hub_challenge code was echoed back
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if (trim($body) !== $hub_challenge) {
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logger("pubsubhubbub: subscriber did not echo back ".
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"hub.challenge, ignoring.");
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logger("\"$hub_challenge\" != \"".trim($body)."\"");
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http_status_exit(404);
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}
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// fetch the old subscription if it exists
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$r = q("SELECT * FROM `push_subscriber` WHERE `callback_url` = '%s'",
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dbesc($hub_callback));
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// delete old subscription if it exists
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q("DELETE FROM `push_subscriber` WHERE `callback_url` = '%s'",
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dbesc($hub_callback));
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if ($subscribe) {
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$last_update = datetime_convert('UTC','UTC','now','Y-m-d H:i:s');
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$push_flag = 0;
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// if we are just updating an old subscription, keep the
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// old values for push and last_update
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if (count($r)) {
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$last_update = $r[0]['last_update'];
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$push_flag = $r[0]['push'];
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}
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// subscribe means adding the row to the table
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q("INSERT INTO `push_subscriber` (`uid`, `callback_url`, " .
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"`topic`, `nickname`, `push`, `last_update`, `secret`) values " .
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"(%d, '%s', '%s', '%s', %d, '%s', '%s')",
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intval($owner['uid']),
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dbesc($hub_callback),
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dbesc($hub_topic),
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dbesc($nick),
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intval($push_flag),
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dbesc($last_update),
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dbesc($hub_secret));
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logger("pubsubhubbub: successfully subscribed [$hub_callback].");
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} else {
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logger("pubsubhubbub: successfully unsubscribed [$hub_callback].");
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// we do nothing here, since the row was already deleted
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}
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http_status_exit(202);
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}
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killme();
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}
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?>
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