Mats Sjöberg
9 years ago
6 changed files with 243 additions and 6 deletions
@ -0,0 +1,162 @@
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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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