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