src/Worker/Notifier.php

   1 <?php
   2 /**
   3  * @file src/Worker/Notifier.php
   4  */
   5 namespace Friendica\Worker;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Core\Addon;
   9 use Friendica\Core\Config;
  10 use Friendica\Core\Hook;
  11 use Friendica\Core\Protocol;
  12 use Friendica\Core\Worker;
  13 use Friendica\Database\DBA;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\Conversation;
  16 use Friendica\Model\Group;
  17 use Friendica\Model\Item;
  18 use Friendica\Model\PushSubscriber;
  19 use Friendica\Model\User;
  20 use Friendica\Network\Probe;
  21 use Friendica\Protocol\ActivityPub;
  22 use Friendica\Protocol\Diaspora;
  23 use Friendica\Protocol\OStatus;
  24 use Friendica\Protocol\Salmon;
  25
  26 require_once 'include/dba.php';
  27 require_once 'include/items.php';
  28
  29 /*
  30  * The notifier is typically called with:
  31  *
  32  *              Worker::add(PRIORITY_HIGH, "Notifier", COMMAND, ITEM_ID);
  33  *
  34  * where COMMAND is one of the following:
  35  *
  36  *              activity                                (in diaspora.php, dfrn_confirm.php, profiles.php)
  37  *              comment-import                  (in diaspora.php, items.php)
  38  *              comment-new                             (in item.php)
  39  *              drop                                    (in diaspora.php, items.php, photos.php)
  40  *              edit_post                               (in item.php)
  41  *              event                                   (in events.php)
  42  *              like                                    (in like.php, poke.php)
  43  *              mail                                    (in message.php)
  44  *              suggest                                 (in fsuggest.php)
  45  *              tag                                             (in photos.php, poke.php, tagger.php)
  46  *              tgroup                                  (in items.php)
  47  *              wall-new                                (in photos.php, item.php)
  48  *              removeme                                (in Contact.php)
  49  *              relocate                                (in uimport.php)
  50  *
  51  * and ITEM_ID is the id of the item in the database that needs to be sent to others.
  52  */
  53
  54 class Notifier
  55 {
  56         public static function execute($cmd, $item_id)
  57         {
  58                 $a = BaseObject::getApp();
  59
  60                 logger('notifier: invoked: '.$cmd.': '.$item_id, LOGGER_DEBUG);
  61
  62                 $top_level = false;
  63                 $recipients = [];
  64                 $url_recipients = [];
  65
  66                 $normal_mode = true;
  67                 $recipients_relocate = [];
  68
  69                 if ($cmd == Delivery::MAIL) {
  70                         $normal_mode = false;
  71                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $item_id]);
  72                         if (!DBA::isResult($message)) {
  73                                 return;
  74                         }
  75                         $uid = $message['uid'];
  76                         $recipients[] = $message['contact-id'];
  77                 } elseif ($cmd == Delivery::SUGGESTION) {
  78                         $normal_mode = false;
  79                         $suggest = DBA::selectFirst('fsuggest', ['uid', 'cid'], ['id' => $item_id]);
  80                         if (!DBA::isResult($suggest)) {
  81                                 return;
  82                         }
  83                         $uid = $suggest['uid'];
  84                         $recipients[] = $suggest['cid'];
  85                 } elseif ($cmd == Delivery::REMOVAL) {
  86                         $r = q("SELECT `contact`.*, `user`.`prvkey` AS `uprvkey`,
  87                                         `user`.`timezone`, `user`.`nickname`, `user`.`sprvkey`, `user`.`spubkey`,
  88                                         `user`.`page-flags`, `user`.`prvnets`, `user`.`account-type`, `user`.`guid`
  89                                 FROM `contact` INNER JOIN `user` ON `user`.`uid` = `contact`.`uid`
  90                                         WHERE `contact`.`uid` = %d AND `contact`.`self` LIMIT 1",
  91                                         intval($item_id));
  92                         if (!$r) {
  93                                 return;
  94                         }
  95                         $user = $r[0];
  96
  97                         $r = q("SELECT * FROM `contact` WHERE NOT `self` AND `uid` = %d", intval($item_id));
  98                         if (!$r) {
  99                                 return;
 100                         }
 101                         foreach ($r as $contact) {
 102                                 Contact::terminateFriendship($user, $contact, true);
 103                         }
 104
 105                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 106                         foreach ($inboxes as $inbox) {
 107                                 logger('Account removal for user ' . $item_id . ' to ' . $inbox .' via ActivityPub', LOGGER_DEBUG);
 108                                 Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 109                                         'APDelivery', Delivery::REMOVAL, '', $inbox, $item_id);
 110                         }
 111
 112                         return;
 113                 } elseif ($cmd == Delivery::RELOCATION) {
 114                         $normal_mode = false;
 115                         $uid = $item_id;
 116
 117                         $recipients_relocate = q("SELECT * FROM `contact` WHERE `uid` = %d AND NOT `self` AND `network` IN ('%s', '%s')",
 118                                                 intval($uid), Protocol::DFRN, Protocol::DIASPORA);
 119                 } else {
 120                         // find ancestors
 121                         $condition = ['id' => $item_id, 'visible' => true, 'moderated' => false];
 122                         $target_item = Item::selectFirst([], $condition);
 123
 124                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
 125                                 return;
 126                         }
 127
 128                         $parent_id = intval($target_item['parent']);
 129                         $uid = $target_item['contact-uid'];
 130                         $updated = $target_item['edited'];
 131
 132                         $condition = ['parent' => $parent_id, 'visible' => true, 'moderated' => false];
 133                         $params = ['order' => ['id']];
 134                         $ret = Item::select([], $condition, $params);
 135
 136                         if (!DBA::isResult($ret)) {
 137                                 return;
 138                         }
 139
 140                         $items = Item::inArray($ret);
 141
 142                         // avoid race condition with deleting entries
 143                         if ($items[0]['deleted']) {
 144                                 foreach ($items as $item) {
 145                                         $item['deleted'] = 1;
 146                                 }
 147                         }
 148
 149                         if ((count($items) == 1) && ($items[0]['id'] === $target_item['id']) && ($items[0]['uri'] === $items[0]['parent-uri'])) {
 150                                 logger('notifier: top level post');
 151                                 $top_level = true;
 152                         }
 153                 }
 154
 155                 $owner = User::getOwnerDataById($uid);
 156                 if (!$owner) {
 157                         return;
 158                 }
 159
 160                 $walltowall = ($top_level && ($owner['id'] != $items[0]['contact-id']) ? true : false);
 161
 162                 // Should the post be transmitted to Diaspora?
 163                 $diaspora_delivery = true;
 164
 165                 // If this is a public conversation, notify the feed hub
 166                 $public_message = true;
 167
 168                 // Do a PuSH
 169                 $push_notify = false;
 170
 171                 // Deliver directly to a forum, don't PuSH
 172                 $direct_forum_delivery = false;
 173
 174                 $followup = false;
 175                 $recipients_followup = [];
 176                 $conversants = [];
 177
 178                 if (!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION, Delivery::RELOCATION])) {
 179                         $parent = $items[0];
 180
 181                         self::activityPubDelivery($a, $cmd, $item_id, $uid, $target_item, $parent);
 182
 183                         $fields = ['network', 'author-id', 'owner-id'];
 184                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 185                         $thr_parent = Item::selectFirst($fields, $condition);
 186
 187                         logger('GUID: '.$target_item["guid"].': Parent is '.$parent['network'].'. Thread parent is '.$thr_parent['network'], LOGGER_DEBUG);
 188
 189                         // This is IMPORTANT!!!!
 190
 191                         // We will only send a "notify owner to relay" or followup message if the referenced post
 192                         // originated on our system by virtue of having our hostname somewhere
 193                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 194
 195                         // if $parent['wall'] == 1 we will already have the parent message in our array
 196                         // and we will relay the whole lot.
 197
 198                         $localhost = str_replace('www.','',$a->getHostName());
 199                         if (strpos($localhost,':')) {
 200                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 201                         }
 202                         /**
 203                          *
 204                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 205                          * have been known to cause runaway conditions which affected several servers, along with
 206                          * permissions issues.
 207                          *
 208                          */
 209
 210                         $relay_to_owner = false;
 211
 212                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 213                                 $relay_to_owner = true;
 214                         }
 215
 216
 217                         if (($cmd === 'uplink') && (intval($parent['forum_mode']) == 1) && !$top_level) {
 218                                 $relay_to_owner = true;
 219                         }
 220
 221                         // until the 'origin' flag has been in use for several months
 222                         // we will just use it as a fallback test
 223                         // later we will be able to use it as the primary test of whether or not to relay.
 224
 225                         if (!$target_item['origin']) {
 226                                 $relay_to_owner = false;
 227                         }
 228                         if ($parent['origin']) {
 229                                 $relay_to_owner = false;
 230                         }
 231
 232                         // Special treatment for forum posts
 233                         if (self::isForumPost($target_item, $owner)) {
 234                                 $relay_to_owner = true;
 235                                 $direct_forum_delivery = true;
 236                         }
 237
 238                         // Avoid that comments in a forum thread are sent to OStatus
 239                         if (self::isForumPost($parent, $owner)) {
 240                                 $direct_forum_delivery = true;
 241                         }
 242
 243                         if ($relay_to_owner) {
 244                                 // local followup to remote post
 245                                 $followup = true;
 246                                 $public_message = false; // not public
 247                                 $conversant_str = DBA::escape($parent['contact-id']);
 248                                 $recipients = [$parent['contact-id']];
 249                                 $recipients_followup  = [$parent['contact-id']];
 250
 251                                 logger('notifier: followup '.$target_item["guid"].' to '.$conversant_str, LOGGER_DEBUG);
 252
 253                                 //if (!$target_item['private'] && $target_item['wall'] &&
 254                                 if (!$target_item['private'] &&
 255                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 256                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 257                                         $push_notify = true;
 258
 259                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 260                                         $push_notify = true;
 261
 262                                         if ($parent["network"] == Protocol::OSTATUS) {
 263                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 264                                                 // Currently it is work at progress
 265                                                 $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `network` = '%s' AND NOT `blocked` AND NOT `pending` AND NOT `archive`",
 266                                                         intval($uid),
 267                                                         DBA::escape(Protocol::DFRN)
 268                                                 );
 269                                                 if (DBA::isResult($r)) {
 270                                                         foreach ($r as $rr) {
 271                                                                 $recipients_followup[] = $rr['id'];
 272                                                         }
 273                                                 }
 274                                         }
 275                                 }
 276
 277                                 if ($direct_forum_delivery) {
 278                                         $push_notify = false;
 279                                 }
 280
 281                                 logger("Notify ".$target_item["guid"]." via PuSH: ".($push_notify?"Yes":"No"), LOGGER_DEBUG);
 282                         } else {
 283                                 $followup = false;
 284
 285                                 logger('Distributing directly '.$target_item["guid"], LOGGER_DEBUG);
 286
 287                                 // don't send deletions onward for other people's stuff
 288
 289                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 290                                         logger('notifier: ignoring delete notification for non-wall item');
 291                                         return;
 292                                 }
 293
 294                                 if (strlen($parent['allow_cid'])
 295                                         || strlen($parent['allow_gid'])
 296                                         || strlen($parent['deny_cid'])
 297                                         || strlen($parent['deny_gid'])) {
 298                                         $public_message = false; // private recipients, not public
 299                                 }
 300
 301                                 $allow_people = expand_acl($parent['allow_cid']);
 302                                 $allow_groups = Group::expand(expand_acl($parent['allow_gid']),true);
 303                                 $deny_people  = expand_acl($parent['deny_cid']);
 304                                 $deny_groups  = Group::expand(expand_acl($parent['deny_gid']));
 305
 306                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 307                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 308
 309                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== 'uplink')) {
 310                                         Worker::add($a->queue['priority'], 'Notifier', 'uplink', $item_id);
 311                                 }
 312
 313                                 foreach ($items as $item) {
 314                                         $recipients[] = $item['contact-id'];
 315                                         $conversants[] = $item['contact-id'];
 316                                         // pull out additional tagged people to notify (if public message)
 317                                         if ($public_message && strlen($item['inform'])) {
 318                                                 $people = explode(',',$item['inform']);
 319                                                 foreach ($people as $person) {
 320                                                         if (substr($person,0,4) === 'cid:') {
 321                                                                 $recipients[] = intval(substr($person,4));
 322                                                                 $conversants[] = intval(substr($person,4));
 323                                                         } else {
 324                                                                 $url_recipients[] = substr($person,4);
 325                                                         }
 326                                                 }
 327                                         }
 328                                 }
 329
 330                                 if (count($url_recipients)) {
 331                                         logger('notifier: '.$target_item["guid"].' url_recipients ' . print_r($url_recipients,true));
 332                                 }
 333
 334                                 $conversants = array_unique($conversants);
 335
 336                                 $recipients = array_unique(array_merge($recipients,$allow_people,$allow_groups));
 337                                 $deny = array_unique(array_merge($deny_people,$deny_groups));
 338                                 $recipients = array_diff($recipients,$deny);
 339
 340                                 $conversant_str = DBA::escape(implode(', ',$conversants));
 341                         }
 342
 343                         // If the thread parent is OStatus then do some magic to distribute the messages.
 344                         // We have not only to look at the parent, since it could be a Friendica thread.
 345                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 346                                 $diaspora_delivery = false;
 347
 348                                 logger('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], LOGGER_DEBUG);
 349
 350                                 // Send a salmon to the parent author
 351                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 352                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 353                                         logger('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 354                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 355                                 }
 356
 357                                 // Send a salmon to the parent owner
 358                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 359                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 360                                         logger('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 361                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 362                                 }
 363
 364                                 // Send a salmon notification to every person we mentioned in the post
 365                                 $arr = explode(',',$target_item['tag']);
 366                                 foreach ($arr as $x) {
 367                                         //logger('Checking tag '.$x, LOGGER_DEBUG);
 368                                         $matches = null;
 369                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 370                                                         $probed_contact = Probe::uri($matches[1]);
 371                                                 if ($probed_contact["notify"] != "") {
 372                                                         logger('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 373                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 374                                                 }
 375                                         }
 376                                 }
 377
 378                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 379                                 $networks = [Protocol::OSTATUS, Protocol::DFRN];
 380                         } else {
 381                                 $networks = [Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 382                         }
 383                 } else {
 384                         $public_message = false;
 385                 }
 386
 387                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 388                 if (!empty($target_item) && function_exists('imap_open') && !Config::get('system','imap_disabled')) {
 389                         if (!strlen($target_item['allow_cid']) && !strlen($target_item['allow_gid'])
 390                                 && !strlen($target_item['deny_cid']) && !strlen($target_item['deny_gid'])
 391                                 && intval($target_item['pubmail'])) {
 392                                 $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `network` = '%s'",
 393                                         intval($uid),
 394                                         DBA::escape(Protocol::MAIL)
 395                                 );
 396                                 if (DBA::isResult($r)) {
 397                                         foreach ($r as $rr) {
 398                                                 $recipients[] = $rr['id'];
 399                                         }
 400                                 }
 401                         }
 402                 }
 403
 404                 if (($cmd == Delivery::RELOCATION)) {
 405                         $r = $recipients_relocate;
 406                 } else {
 407                         if ($followup) {
 408                                 $recipients = $recipients_followup;
 409                         }
 410                         $condition = ['id' => $recipients, 'self' => false,
 411                                 'blocked' => false, 'pending' => false, 'archive' => false];
 412                         if (!empty($networks)) {
 413                                 $condition['network'] = $networks;
 414                         }
 415                         $contacts = DBA::select('contact', ['id', 'url', 'network'], $condition);
 416                         $r = DBA::toArray($contacts);
 417                 }
 418
 419                 // delivery loop
 420                 if (DBA::isResult($r)) {
 421                         foreach ($r as $contact) {
 422                                 logger("Deliver ".$item_id." to ".$contact['url']." via network ".$contact['network'], LOGGER_DEBUG);
 423
 424                                 Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 425                                                 'Delivery', $cmd, $item_id, (int)$contact['id']);
 426                         }
 427                 }
 428
 429                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 430                 // They are especially used for notifications to OStatus users that don't follow us.
 431                 if (!Config::get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && $normal_mode) {
 432                         $slap = OStatus::salmon($target_item, $owner);
 433                         foreach ($url_recipients as $url) {
 434                                 if ($url) {
 435                                         logger('notifier: urldelivery: ' . $url);
 436                                         $deliver_status = Salmon::slapper($owner, $url, $slap);
 437                                         /// @TODO Redeliver/queue these items on failure, though there is no contact record
 438                                 }
 439                         }
 440                 }
 441
 442                 if ($public_message) {
 443                         $r1 = [];
 444
 445                         if ($diaspora_delivery) {
 446                                 $r1 = q("SELECT `batch`, ANY_VALUE(`id`) AS `id`, ANY_VALUE(`name`) AS `name`, ANY_VALUE(`network`) AS `network`
 447                                         FROM `contact` WHERE `network` = '%s' AND `batch` != ''
 448                                         AND `uid` = %d AND `rel` != %d AND NOT `blocked` AND NOT `pending` AND NOT `archive` GROUP BY `batch`",
 449                                         DBA::escape(Protocol::DIASPORA),
 450                                         intval($owner['uid']),
 451                                         intval(Contact::SHARING)
 452                                 );
 453
 454                                 // Fetch the participation list
 455                                 // The function will ensure that there are no duplicates
 456                                 $r1 = Diaspora::participantsForThread($item_id, $r1);
 457
 458                                 // Add the relay to the list, avoid duplicates
 459                                 if (!$followup) {
 460                                         $r1 = Diaspora::relayList($item_id, $r1);
 461                                 }
 462                         }
 463
 464                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 465                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 466
 467                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'name', 'network'], $condition));
 468
 469                         $r = array_merge($r2, $r1);
 470
 471                         if (DBA::isResult($r)) {
 472                                 logger('pubdeliver '.$target_item["guid"].': '.print_r($r,true), LOGGER_DEBUG);
 473
 474                                 foreach ($r as $rr) {
 475                                         // except for Diaspora batch jobs
 476                                         // Don't deliver to folks who have already been delivered to
 477
 478                                         if (($rr['network'] !== Protocol::DIASPORA) && (in_array($rr['id'], $conversants))) {
 479                                                 logger('notifier: already delivered id=' . $rr['id']);
 480                                                 continue;
 481                                         }
 482
 483                                         if (!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 484                                                 logger('notifier: delivery agent: '.$rr['name'].' '.$rr['id'].' '.$rr['network'].' '.$target_item["guid"]);
 485                                                 Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 486                                                                 'Delivery', $cmd, $item_id, (int)$rr['id']);
 487                                         }
 488                                 }
 489                         }
 490
 491                         $push_notify = true;
 492                 }
 493
 494                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 495                 if ($push_notify) {
 496                         logger('Activating internal PuSH for item '.$item_id, LOGGER_DEBUG);
 497
 498                         // Handling the pubsubhubbub requests
 499                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 500                 }
 501
 502                 logger('notifier: calling hooks for ' . $cmd . ' ' . $item_id, LOGGER_DEBUG);
 503
 504                 if ($normal_mode) {
 505                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 506                 }
 507
 508                 Addon::callHooks('notifier_end',$target_item);
 509
 510                 return;
 511         }
 512
 513         private static function activityPubDelivery($a, $cmd, $item_id, $uid, $target_item, $parent)
 514         {
 515                 $inboxes = [];
 516                 $personal = false;
 517
 518                 if ($target_item['origin']) {
 519                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 520                         logger('Origin item ' . $item_id . ' with URL ' . $target_item['uri'] . ' will be distributed.', LOGGER_DEBUG);
 521                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 522                         logger('Remote item ' . $item_id . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', LOGGER_DEBUG);
 523                         return;
 524                 } else {
 525                         // Remote items are transmitted via the personal inboxes.
 526                         // Doing so ensures that the dedicated receiver will get the message.
 527                         $personal = true;
 528                         logger('Remote item ' . $item_id . ' with URL ' . $target_item['uri'] . ' will be distributed.', LOGGER_DEBUG);
 529                 }
 530
 531                 if ($parent['origin']) {
 532                         $parent_inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, $personal);
 533                         $inboxes = array_merge($inboxes, $parent_inboxes);
 534                 }
 535
 536                 if (empty($inboxes)) {
 537                         logger('No inboxes found for item ' . $item_id . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', LOGGER_DEBUG);
 538                         return;
 539                 }
 540
 541                 // Fill the item cache
 542                 ActivityPub\Transmitter::createCachedActivityFromItem($item_id);
 543
 544                 foreach ($inboxes as $inbox) {
 545                         logger('Deliver ' . $item_id .' to ' . $inbox .' via ActivityPub', LOGGER_DEBUG);
 546
 547                         Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 548                                         'APDelivery', $cmd, $item_id, $inbox, $uid);
 549                 }
 550         }
 551
 552         private static function isForumPost($item, $owner) {
 553                 if (($item['author-id'] == $item['owner-id']) ||
 554                         ($owner['id'] == $item['contact-id']) ||
 555                         ($item['uri'] != $item['parent-uri'])) {
 556                         return false;
 557                 }
 558
 559                 $fields = ['forum', 'prv'];
 560                 $condition = ['id' => $item['contact-id']];
 561                 $contact = DBA::selectFirst('contact', $fields, $condition);
 562                 if (!DBA::isResult($contact)) {
 563                         // Should never happen
 564                         return false;
 565                 }
 566
 567                 // Is the post from a forum?
 568                 return ($contact['forum'] || $contact['prv']);
 569         }
 570 }