5 function post_var($name) {
6 return (x($_POST, $name)) ? notags(trim($_POST[$name])) : '';
9 function pubsubhubbub_init(App $a) {
10 // PuSH subscription must be considered "public" so just block it
11 // if public access isn't enabled.
12 if (get_config('system', 'block_public')) {
13 http_status_exit(403);
16 // Subscription request from subscriber
17 // https://pubsubhubbub.googlecode.com/git/pubsubhubbub-core-0.4.html#anchor4
18 // Example from GNU Social:
19 // [hub_mode] => subscribe
20 // [hub_callback] => http://status.local/main/push/callback/1
21 // [hub_verify] => sync
22 // [hub_verify_token] => af11...
23 // [hub_secret] => af11...
24 // [hub_topic] => http://friendica.local/dfrn_poll/sazius
26 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
27 $hub_mode = post_var('hub_mode');
28 $hub_callback = post_var('hub_callback');
29 $hub_verify = post_var('hub_verify');
30 $hub_verify_token = post_var('hub_verify_token');
31 $hub_secret = post_var('hub_secret');
32 $hub_topic = post_var('hub_topic');
34 // check for valid hub_mode
35 if ($hub_mode === 'subscribe') {
37 } elseif ($hub_mode === 'unsubscribe') {
40 logger("pubsubhubbub: invalid hub_mode=$hub_mode, ignoring.");
41 http_status_exit(404);
44 logger("pubsubhubbub: $hub_mode request from " .
45 $_SERVER['REMOTE_ADDR']);
47 // get the nick name from the topic, a bit hacky but needed as a fallback
48 $nick = substr(strrchr($hub_topic, "/"), 1);
50 // Normally the url should now contain the nick name as last part of the url
56 logger('pubsubhubbub: bad hub_topic=$hub_topic, ignoring.');
57 http_status_exit(404);
60 // fetch user from database given the nickname
61 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s'" .
62 " AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
65 if (!dbm::is_result($r)) {
66 logger('pubsubhubbub: local account not found: ' . $nick);
67 http_status_exit(404);
72 // abort if user's wall is supposed to be private
73 if ($r[0]['hidewall']) {
74 logger('pubsubhubbub: local user ' . $nick .
75 'has chosen to hide wall, ignoring.');
76 http_status_exit(403);
79 // get corresponding row from contact table
80 $r = q("SELECT * FROM `contact` WHERE `uid` = %d AND NOT `blocked`".
81 " AND NOT `pending` AND `self` LIMIT 1",
82 intval($owner['uid']));
83 if (!dbm::is_result($r)) {
84 logger('pubsubhubbub: contact not found.');
85 http_status_exit(404);
90 // sanity check that topic URLs are the same
91 if (!link_compare($hub_topic, $contact['poll'])) {
92 logger('pubsubhubbub: hub topic ' . $hub_topic . ' != ' .
94 http_status_exit(404);
97 // do subscriber verification according to the PuSH protocol
98 $hub_challenge = random_string(40);
99 $params = 'hub.mode=' .
100 ($subscribe == 1 ? 'subscribe' : 'unsubscribe') .
101 '&hub.topic=' . urlencode($hub_topic) .
102 '&hub.challenge=' . $hub_challenge .
103 '&hub.lease_seconds=604800' .
104 '&hub.verify_token=' . $hub_verify_token;
106 // lease time is hard coded to one week (in seconds)
107 // we don't actually enforce the lease time because GNU
108 // Social/StatusNet doesn't honour it (yet)
110 $body = fetch_url($hub_callback . "?" . $params);
111 $ret = $a->get_curl_code();
113 // give up if the HTTP return code wasn't a success (2xx)
114 if ($ret < 200 || $ret > 299) {
115 logger("pubsubhubbub: subscriber verification at $hub_callback ".
116 "returned $ret, ignoring.");
117 http_status_exit(404);
120 // check that the correct hub_challenge code was echoed back
121 if (trim($body) !== $hub_challenge) {
122 logger("pubsubhubbub: subscriber did not echo back ".
123 "hub.challenge, ignoring.");
124 logger("\"$hub_challenge\" != \"".trim($body)."\"");
125 http_status_exit(404);
128 // fetch the old subscription if it exists
129 $r = q("SELECT * FROM `push_subscriber` WHERE `callback_url` = '%s'",
130 dbesc($hub_callback));
132 // delete old subscription if it exists
133 q("DELETE FROM `push_subscriber` WHERE `callback_url` = '%s'",
134 dbesc($hub_callback));
137 $last_update = datetime_convert('UTC','UTC','now','Y-m-d H:i:s');
140 // if we are just updating an old subscription, keep the
141 // old values for push and last_update
142 if (dbm::is_result($r)) {
143 $last_update = $r[0]['last_update'];
144 $push_flag = $r[0]['push'];
147 // subscribe means adding the row to the table
148 q("INSERT INTO `push_subscriber` (`uid`, `callback_url`, " .
149 "`topic`, `nickname`, `push`, `last_update`, `secret`) values " .
150 "(%d, '%s', '%s', '%s', %d, '%s', '%s')",
151 intval($owner['uid']),
152 dbesc($hub_callback),
158 logger("pubsubhubbub: successfully subscribed [$hub_callback].");
160 logger("pubsubhubbub: successfully unsubscribed [$hub_callback].");
161 // we do nothing here, since the row was already deleted
163 http_status_exit(202);