src/Worker/PubSubPublish.php

   1 <?php
   2 /**
   3  * @file src/Worker/PubSubPublish.php
   4  */
   5
   6 namespace Friendica\Worker;
   7
   8 use Friendica\App;
   9 use Friendica\Core\System;
  10 use Friendica\Core\Config;
  11 use Friendica\Core\Worker;
  12 use Friendica\Database\DBM;
  13 use Friendica\Protocol\OStatus;
  14 use Friendica\Util\Network;
  15 use Friendica\Util\DateTimeFormat;
  16 use dba;
  17
  18 require_once 'include/items.php';
  19
  20 class PubSubPublish {
  21         public static function execute($pubsubpublish_id = 0)
  22         {
  23                 global $a;
  24
  25                 if ($pubsubpublish_id != 0) {
  26                         self::publish($pubsubpublish_id);
  27                         return;
  28                 }
  29
  30                 // We'll push to each subscriber that has push > 0,
  31                 // i.e. there has been an update (set in notifier.php).
  32                 $subscribers = dba::select('push_subscriber', ['id', 'callback_url'], ["`push` > 0 AND `next_try` < UTC_TIMESTAMP()"]);
  33
  34                 while ($subscriber = dba::fetch($subscribers)) {
  35                         logger("Publish feed to " . $subscriber["callback_url"], LOGGER_DEBUG);
  36                         Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
  37                                         'PubSubPublish', (int)$subscriber["id"]);
  38                 }
  39
  40                 dba::close($subscribers);
  41         }
  42
  43         private static function publish($id) {
  44                 global $a;
  45
  46                 $subscriber = dba::selectFirst('push_subscriber', [], ['id' => $id]);
  47                 if (!DBM::is_result($subscriber)) {
  48                         return;
  49                 }
  50
  51                 /// @todo Check server status with PortableContact::checkServer()
  52                 // Before this can be done we need a way to safely detect the server url.
  53
  54                 logger("Generate feed of user " . $subscriber['nickname']. " to " . $subscriber['callback_url']. " - last updated " . $subscriber['last_update'], LOGGER_DEBUG);
  55
  56                 $last_update = $subscriber['last_update'];
  57                 $params = OStatus::feed($subscriber['nickname'], $last_update);
  58
  59                 if (!$params) {
  60                         return;
  61                 }
  62
  63                 $hmac_sig = hash_hmac("sha1", $params, $subscriber['secret']);
  64
  65                 $headers = ["Content-type: application/atom+xml",
  66                                 sprintf("Link: <%s>;rel=hub,<%s>;rel=self",
  67                                         System::baseUrl() . '/pubsubhubbub/' . $subscriber['nickname'],
  68                                         $subscriber['topic']),
  69                                 "X-Hub-Signature: sha1=" . $hmac_sig];
  70
  71                 logger('POST ' . print_r($headers, true) . "\n" . $params, LOGGER_DATA);
  72
  73                 Network::post($subscriber['callback_url'], $params, $headers);
  74                 $ret = $a->get_curl_code();
  75
  76                 $condition = ['id' => $subscriber['id']];
  77
  78                 if ($ret >= 200 && $ret <= 299) {
  79                         logger('Successfully pushed to ' . $subscriber['callback_url']);
  80
  81                         // set last_update to the "created" date of the last item, and reset push=0
  82                         $fields = ['push' => 0, 'next_try' => NULL_DATE, 'last_update' => $last_update];
  83                         dba::update('push_subscriber', $fields, $condition);
  84
  85                 } else {
  86                         logger('Delivery error when pushing to ' . $subscriber['callback_url'] . ' HTTP: ' . $ret);
  87
  88                         // we use the push variable also as a counter, if we failed we
  89                         // increment this until some upper limit where we give up
  90                         $retrial = $subscriber['push'];
  91
  92                         if ($retrial > 14) {
  93                                 dba::update('push_subscriber', ['push' => 0, 'next_try' => NULL_DATE], $condition);
  94                                 logger('Delivery error: Giving up for ' . $subscriber['callback_url'], LOGGER_DEBUG);
  95                         } else {
  96                                 // Calculate the delay until the next trial
  97                                 $delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
  98                                 $next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
  99
 100                                 $retrial = $retrial + 1;
 101
 102                                 dba::update('push_subscriber', ['push' => $retrial, 'next_try' => $next], $condition);
 103                                 logger('Delivery error: Next try (' . $retrial . ') for ' . $subscriber['callback_url'] . ' at ' . $next, LOGGER_DEBUG);
 104                         }
 105                 }
 106         }
 107 }