128 lines
4.2 KiB
PHP
128 lines
4.2 KiB
PHP
<?php
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use Friendica\App;
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use Friendica\Core\Config;
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use Friendica\Core\System;
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use Friendica\Database\DBM;
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use Friendica\Util\Network;
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use Friendica\Model\PushSubscriber;
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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(App $a) {
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// PuSH subscription must be considered "public" so just block it
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// if public access isn't enabled.
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if (Config::get('system', 'block_public')) {
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System::httpExit(403);
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}
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// Subscription request from subscriber
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// https://pubsubhubbub.googlecode.com/git/pubsubhubbub-core-0.4.html#anchor4
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// Example from GNU Social:
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// [hub_mode] => subscribe
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// [hub_callback] => http://status.local/main/push/callback/1
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// [hub_verify] => sync
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// [hub_verify_token] => af11...
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// [hub_secret] => af11...
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// [hub_topic] => http://friendica.local/dfrn_poll/sazius
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if ($_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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} elseif ($hub_mode === 'unsubscribe') {
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$subscribe = 0;
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} else {
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logger("Invalid hub_mode=$hub_mode, ignoring.");
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System::httpExit(404);
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}
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logger("$hub_mode request from " . $_SERVER['REMOTE_ADDR']);
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// get the nick name from the topic, a bit hacky but needed as a fallback
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$nick = substr(strrchr($hub_topic, "/"), 1);
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// Normally the url should now contain the nick name as last part of the url
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if ($a->argc > 1) {
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$nick = $a->argv[1];
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}
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if (!$nick) {
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logger('Bad hub_topic=$hub_topic, ignoring.');
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System::httpExit(404);
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}
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// fetch user from database given the nickname
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$condition = ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false];
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$owner = dba::selectFirst('user', ['uid', 'hidewall'], $condition);
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if (!DBM::is_result($owner)) {
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logger('Local account not found: ' . $nick . ' - topic: ' . $hub_topic . ' - callback: ' . $hub_callback);
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System::httpExit(404);
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}
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// abort if user's wall is supposed to be private
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if ($owner['hidewall']) {
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logger('Local user ' . $nick . 'has chosen to hide wall, ignoring.');
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System::httpExit(403);
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}
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// get corresponding row from contact table
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$condition = ['uid' => $owner['uid'], 'blocked' => false,
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'pending' => false, 'self' => true];
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$contact = dba::selectFirst('contact', ['poll'], $condition);
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if (!DBM::is_result($contact)) {
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logger('Self contact for user ' . $owner['uid'] . ' not found.');
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System::httpExit(404);
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}
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// sanity check that topic URLs are the same
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$hub_topic2 = str_replace('/feed/', '/dfrn_poll/', $hub_topic);
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if (!link_compare($hub_topic, $contact['poll']) && !link_compare($hub_topic2, $contact['poll'])) {
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logger('Hub topic ' . $hub_topic . ' != ' . $contact['poll']);
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System::httpExit(404);
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}
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// do subscriber verification according to the PuSH protocol
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$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 = Network::fetchUrl($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("Subscriber verification for $hub_topic at $hub_callback returned $ret, ignoring.");
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System::httpExit(404);
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}
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// check that the correct hub_challenge code was echoed back
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if (trim($body) !== $hub_challenge) {
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logger("Subscriber did not echo back hub.challenge, ignoring.");
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logger("\"$hub_challenge\" != \"".trim($body)."\"");
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System::httpExit(404);
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}
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PushSubscriber::renew($owner['uid'], $nick, $subscribe, $hub_callback, $hub_topic, $hub_secret);
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System::httpExit(202);
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}
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killme();
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}
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