4 use Friendica\Core\Config;
6 function post_var($name) {
7 return (x($_POST, $name)) ? notags(trim($_POST[$name])) : '';
10 function pubsubhubbub_init(App $a) {
11 // PuSH subscription must be considered "public" so just block it
12 // if public access isn't enabled.
13 if (Config::get('system', 'block_public')) {
14 http_status_exit(403);
17 // Subscription request from subscriber
18 // https://pubsubhubbub.googlecode.com/git/pubsubhubbub-core-0.4.html#anchor4
19 // Example from GNU Social:
20 // [hub_mode] => subscribe
21 // [hub_callback] => http://status.local/main/push/callback/1
22 // [hub_verify] => sync
23 // [hub_verify_token] => af11...
24 // [hub_secret] => af11...
25 // [hub_topic] => http://friendica.local/dfrn_poll/sazius
27 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
28 $hub_mode = post_var('hub_mode');
29 $hub_callback = post_var('hub_callback');
30 $hub_verify = post_var('hub_verify');
31 $hub_verify_token = post_var('hub_verify_token');
32 $hub_secret = post_var('hub_secret');
33 $hub_topic = post_var('hub_topic');
35 // check for valid hub_mode
36 if ($hub_mode === 'subscribe') {
38 } elseif ($hub_mode === 'unsubscribe') {
41 logger("pubsubhubbub: invalid hub_mode=$hub_mode, ignoring.");
42 http_status_exit(404);
45 logger("pubsubhubbub: $hub_mode request from " .
46 $_SERVER['REMOTE_ADDR']);
48 // get the nick name from the topic, a bit hacky but needed as a fallback
49 $nick = substr(strrchr($hub_topic, "/"), 1);
51 // Normally the url should now contain the nick name as last part of the url
57 logger('pubsubhubbub: bad hub_topic=$hub_topic, ignoring.');
58 http_status_exit(404);
61 // fetch user from database given the nickname
62 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s'" .
63 " AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
66 if (!dbm::is_result($r)) {
67 logger('pubsubhubbub: local account not found: ' . $nick);
68 http_status_exit(404);
73 // abort if user's wall is supposed to be private
74 if ($r[0]['hidewall']) {
75 logger('pubsubhubbub: local user ' . $nick .
76 'has chosen to hide wall, ignoring.');
77 http_status_exit(403);
80 // get corresponding row from contact table
81 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND NOT `blocked`".
82 " AND NOT `pending` AND `self` LIMIT 1",
83 intval($owner['uid']));
84 if (!dbm::is_result($r)) {
85 logger('pubsubhubbub: contact not found.');
86 http_status_exit(404);
91 // sanity check that topic URLs are the same
92 if (!link_compare($hub_topic, $contact['poll'])) {
93 logger('pubsubhubbub: hub topic ' . $hub_topic . ' != ' .
95 http_status_exit(404);
98 // do subscriber verification according to the PuSH protocol
99 $hub_challenge = random_string(40);
100 $params = 'hub.mode=' .
101 ($subscribe == 1 ? 'subscribe' : 'unsubscribe') .
102 '&hub.topic=' . urlencode($hub_topic) .
103 '&hub.challenge=' . $hub_challenge .
104 '&hub.lease_seconds=604800' .
105 '&hub.verify_token=' . $hub_verify_token;
107 // lease time is hard coded to one week (in seconds)
108 // we don't actually enforce the lease time because GNU
109 // Social/StatusNet doesn't honour it (yet)
111 $body = fetch_url($hub_callback . "?" . $params);
112 $ret = $a->get_curl_code();
114 // give up if the HTTP return code wasn't a success (2xx)
115 if ($ret < 200 || $ret > 299) {
116 logger("pubsubhubbub: subscriber verification at $hub_callback ".
117 "returned $ret, ignoring.");
118 http_status_exit(404);
121 // check that the correct hub_challenge code was echoed back
122 if (trim($body) !== $hub_challenge) {
123 logger("pubsubhubbub: subscriber did not echo back ".
124 "hub.challenge, ignoring.");
125 logger("\"$hub_challenge\" != \"".trim($body)."\"");
126 http_status_exit(404);
129 // fetch the old subscription if it exists
130 $r = q("SELECT * FROM `push_subscriber` WHERE `callback_url` = '%s'",
131 dbesc($hub_callback));
133 // delete old subscription if it exists
134 q("DELETE FROM `push_subscriber` WHERE `callback_url` = '%s'",
135 dbesc($hub_callback));
138 $last_update = datetime_convert('UTC','UTC','now','Y-m-d H:i:s');
141 // if we are just updating an old subscription, keep the
142 // old values for push and last_update
143 if (dbm::is_result($r)) {
144 $last_update = $r[0]['last_update'];
145 $push_flag = $r[0]['push'];
148 // subscribe means adding the row to the table
149 q("INSERT INTO `push_subscriber` (`uid`, `callback_url`, " .
150 "`topic`, `nickname`, `push`, `last_update`, `secret`) values " .
151 "(%d, '%s', '%s', '%s', %d, '%s', '%s')",
152 intval($owner['uid']),
153 dbesc($hub_callback),
159 logger("pubsubhubbub: successfully subscribed [$hub_callback].");
161 logger("pubsubhubbub: successfully unsubscribed [$hub_callback].");
162 // we do nothing here, since the row was already deleted
164 http_status_exit(202);