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                 $a = BaseObject::getApp();
  60
  61                 Logger::log('notifier: invoked: '.$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('notifier: 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                 $conversants = [];
 178
 179                 if (!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION, Delivery::RELOCATION])) {
 180                         $parent = $items[0];
 181
 182                         self::activityPubDelivery($a, $cmd, $item_id, $uid, $target_item, $parent);
 183
 184                         $fields = ['network', 'author-id', 'owner-id'];
 185                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 186                         $thr_parent = Item::selectFirst($fields, $condition);
 187
 188                         Logger::log('GUID: '.$target_item["guid"].': Parent is '.$parent['network'].'. Thread parent is '.$thr_parent['network'], Logger::DEBUG);
 189
 190                         // This is IMPORTANT!!!!
 191
 192                         // We will only send a "notify owner to relay" or followup message if the referenced post
 193                         // originated on our system by virtue of having our hostname somewhere
 194                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 195
 196                         // if $parent['wall'] == 1 we will already have the parent message in our array
 197                         // and we will relay the whole lot.
 198
 199                         $localhost = str_replace('www.','',$a->getHostName());
 200                         if (strpos($localhost,':')) {
 201                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 202                         }
 203                         /**
 204                          *
 205                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 206                          * have been known to cause runaway conditions which affected several servers, along with
 207                          * permissions issues.
 208                          *
 209                          */
 210
 211                         $relay_to_owner = false;
 212
 213                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 214                                 $relay_to_owner = true;
 215                         }
 216
 217
 218                         if (($cmd === 'uplink') && (intval($parent['forum_mode']) == 1) && !$top_level) {
 219                                 $relay_to_owner = true;
 220                         }
 221
 222                         // until the 'origin' flag has been in use for several months
 223                         // we will just use it as a fallback test
 224                         // later we will be able to use it as the primary test of whether or not to relay.
 225
 226                         if (!$target_item['origin']) {
 227                                 $relay_to_owner = false;
 228                         }
 229                         if ($parent['origin']) {
 230                                 $relay_to_owner = false;
 231                         }
 232
 233                         // Special treatment for forum posts
 234                         if (self::isForumPost($target_item, $owner)) {
 235                                 $relay_to_owner = true;
 236                                 $direct_forum_delivery = true;
 237                         }
 238
 239                         // Avoid that comments in a forum thread are sent to OStatus
 240                         if (self::isForumPost($parent, $owner)) {
 241                                 $direct_forum_delivery = true;
 242                         }
 243
 244                         if ($relay_to_owner) {
 245                                 // local followup to remote post
 246                                 $followup = true;
 247                                 $public_message = false; // not public
 248                                 $conversant_str = DBA::escape($parent['contact-id']);
 249                                 $recipients = [$parent['contact-id']];
 250                                 $recipients_followup  = [$parent['contact-id']];
 251
 252                                 Logger::log('notifier: followup '.$target_item["guid"].' to '.$conversant_str, Logger::DEBUG);
 253
 254                                 //if (!$target_item['private'] && $target_item['wall'] &&
 255                                 if (!$target_item['private'] &&
 256                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 257                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 258                                         $push_notify = true;
 259
 260                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 261                                         $push_notify = true;
 262
 263                                         if ($parent["network"] == Protocol::OSTATUS) {
 264                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 265                                                 // Currently it is work at progress
 266                                                 $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `network` = '%s' AND NOT `blocked` AND NOT `pending` AND NOT `archive`",
 267                                                         intval($uid),
 268                                                         DBA::escape(Protocol::DFRN)
 269                                                 );
 270                                                 if (DBA::isResult($r)) {
 271                                                         foreach ($r as $rr) {
 272                                                                 $recipients_followup[] = $rr['id'];
 273                                                         }
 274                                                 }
 275                                         }
 276                                 }
 277
 278                                 if ($direct_forum_delivery) {
 279                                         $push_notify = false;
 280                                 }
 281
 282                                 Logger::log("Notify ".$target_item["guid"]." via PuSH: ".($push_notify?"Yes":"No"), Logger::DEBUG);
 283                         } else {
 284                                 $followup = false;
 285
 286                                 Logger::log('Distributing directly '.$target_item["guid"], Logger::DEBUG);
 287
 288                                 // don't send deletions onward for other people's stuff
 289
 290                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 291                                         Logger::log('notifier: ignoring delete notification for non-wall item');
 292                                         return;
 293                                 }
 294
 295                                 if (strlen($parent['allow_cid'])
 296                                         || strlen($parent['allow_gid'])
 297                                         || strlen($parent['deny_cid'])
 298                                         || strlen($parent['deny_gid'])) {
 299                                         $public_message = false; // private recipients, not public
 300                                 }
 301
 302                                 $allow_people = expand_acl($parent['allow_cid']);
 303                                 $allow_groups = Group::expand(expand_acl($parent['allow_gid']),true);
 304                                 $deny_people  = expand_acl($parent['deny_cid']);
 305                                 $deny_groups  = Group::expand(expand_acl($parent['deny_gid']));
 306
 307                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 308                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 309
 310                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== 'uplink')) {
 311                                         Worker::add($a->queue['priority'], 'Notifier', 'uplink', $item_id);
 312                                 }
 313
 314                                 foreach ($items as $item) {
 315                                         $recipients[] = $item['contact-id'];
 316                                         $conversants[] = $item['contact-id'];
 317                                         // pull out additional tagged people to notify (if public message)
 318                                         if ($public_message && strlen($item['inform'])) {
 319                                                 $people = explode(',',$item['inform']);
 320                                                 foreach ($people as $person) {
 321                                                         if (substr($person,0,4) === 'cid:') {
 322                                                                 $recipients[] = intval(substr($person,4));
 323                                                                 $conversants[] = intval(substr($person,4));
 324                                                         } else {
 325                                                                 $url_recipients[] = substr($person,4);
 326                                                         }
 327                                                 }
 328                                         }
 329                                 }
 330
 331                                 if (count($url_recipients)) {
 332                                         Logger::log('notifier: '.$target_item["guid"].' url_recipients ' . print_r($url_recipients,true));
 333                                 }
 334
 335                                 $conversants = array_unique($conversants);
 336
 337                                 $recipients = array_unique(array_merge($recipients,$allow_people,$allow_groups));
 338                                 $deny = array_unique(array_merge($deny_people,$deny_groups));
 339                                 $recipients = array_diff($recipients,$deny);
 340
 341                                 $conversant_str = DBA::escape(implode(', ',$conversants));
 342                         }
 343
 344                         // If the thread parent is OStatus then do some magic to distribute the messages.
 345                         // We have not only to look at the parent, since it could be a Friendica thread.
 346                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 347                                 $diaspora_delivery = false;
 348
 349                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 350
 351                                 // Send a salmon to the parent author
 352                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 353                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 354                                         Logger::log('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 355                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 356                                 }
 357
 358                                 // Send a salmon to the parent owner
 359                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 360                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 361                                         Logger::log('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 362                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 363                                 }
 364
 365                                 // Send a salmon notification to every person we mentioned in the post
 366                                 $arr = explode(',',$target_item['tag']);
 367                                 foreach ($arr as $x) {
 368                                         //Logger::log('Checking tag '.$x, Logger::DEBUG);
 369                                         $matches = null;
 370                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 371                                                         $probed_contact = Probe::uri($matches[1]);
 372                                                 if ($probed_contact["notify"] != "") {
 373                                                         Logger::log('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 374                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 375                                                 }
 376                                         }
 377                                 }
 378
 379                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 380                                 $networks = [Protocol::OSTATUS, Protocol::DFRN];
 381                         } else {
 382                                 $networks = [Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 383                         }
 384                 } else {
 385                         $public_message = false;
 386                 }
 387
 388                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 389                 if (!empty($target_item) && function_exists('imap_open') && !Config::get('system','imap_disabled')) {
 390                         if (!strlen($target_item['allow_cid']) && !strlen($target_item['allow_gid'])
 391                                 && !strlen($target_item['deny_cid']) && !strlen($target_item['deny_gid'])
 392                                 && intval($target_item['pubmail'])) {
 393                                 $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `network` = '%s'",
 394                                         intval($uid),
 395                                         DBA::escape(Protocol::MAIL)
 396                                 );
 397                                 if (DBA::isResult($r)) {
 398                                         foreach ($r as $rr) {
 399                                                 $recipients[] = $rr['id'];
 400                                         }
 401                                 }
 402                         }
 403                 }
 404
 405                 if (($cmd == Delivery::RELOCATION)) {
 406                         $r = $recipients_relocate;
 407                 } else {
 408                         if ($followup) {
 409                                 $recipients = $recipients_followup;
 410                         }
 411                         $condition = ['id' => $recipients, 'self' => false,
 412                                 'blocked' => false, 'pending' => false, 'archive' => false];
 413                         if (!empty($networks)) {
 414                                 $condition['network'] = $networks;
 415                         }
 416                         $contacts = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
 417                         $r = DBA::toArray($contacts);
 418                 }
 419
 420                 // delivery loop
 421                 if (DBA::isResult($r)) {
 422                         foreach ($r as $contact) {
 423                                 if (($contact['network'] == Protocol::DIASPORA) && $diaspora_delivery && $public_message && !empty($contact['batch'])
 424                                         && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 425                                         continue;
 426                                 }
 427                                 Logger::log("Deliver ".$item_id." to ".$contact['url']." via network ".$contact['network'], Logger::DEBUG);
 428
 429                                 Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 430                                                 'Delivery', $cmd, $item_id, (int)$contact['id']);
 431                         }
 432                 }
 433
 434                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 435                 // They are especially used for notifications to OStatus users that don't follow us.
 436                 if (!Config::get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && $normal_mode) {
 437                         $slap = OStatus::salmon($target_item, $owner);
 438                         foreach ($url_recipients as $url) {
 439                                 if ($url) {
 440                                         Logger::log('notifier: urldelivery: ' . $url);
 441                                         $deliver_status = Salmon::slapper($owner, $url, $slap);
 442                                         /// @TODO Redeliver/queue these items on failure, though there is no contact record
 443                                 }
 444                         }
 445                 }
 446
 447                 if ($public_message) {
 448                         $r1 = [];
 449
 450                         if ($diaspora_delivery) {
 451                                 $r1 = q("SELECT `batch`, ANY_VALUE(`id`) AS `id`, ANY_VALUE(`name`) AS `name`, ANY_VALUE(`network`) AS `network`
 452                                         FROM `contact` WHERE `network` = '%s' AND `batch` != ''
 453                                         AND `uid` = %d AND `rel` != %d AND NOT `blocked` AND NOT `pending` AND NOT `archive` GROUP BY `batch`",
 454                                         DBA::escape(Protocol::DIASPORA),
 455                                         intval($owner['uid']),
 456                                         intval(Contact::SHARING)
 457                                 );
 458
 459                                 // Fetch the participation list
 460                                 // The function will ensure that there are no duplicates
 461                                 $r1 = Diaspora::participantsForThread($item_id, $r1);
 462
 463                                 // Add the relay to the list, avoid duplicates
 464                                 if (!$followup) {
 465                                         $r1 = Diaspora::relayList($item_id, $r1);
 466                                 }
 467                         }
 468
 469                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 470                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 471
 472                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'name', 'network'], $condition));
 473
 474                         $r = array_merge($r2, $r1);
 475
 476                         if (DBA::isResult($r)) {
 477                                 Logger::log('pubdeliver '.$target_item["guid"].': '.print_r($r,true), Logger::DEBUG);
 478
 479                                 foreach ($r as $rr) {
 480                                         // except for Diaspora batch jobs
 481                                         // Don't deliver to folks who have already been delivered to
 482
 483                                         if (($rr['network'] !== Protocol::DIASPORA) && (in_array($rr['id'], $conversants))) {
 484                                                 Logger::log('notifier: already delivered id=' . $rr['id']);
 485                                                 continue;
 486                                         }
 487
 488                                         if (!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 489                                                 Logger::log('notifier: delivery agent: '.$rr['name'].' '.$rr['id'].' '.$rr['network'].' '.$target_item["guid"]);
 490                                                 Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 491                                                                 'Delivery', $cmd, $item_id, (int)$rr['id']);
 492                                         }
 493                                 }
 494                         }
 495
 496                         $push_notify = true;
 497                 }
 498
 499                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 500                 if ($push_notify) {
 501                         Logger::log('Activating internal PuSH for item '.$item_id, Logger::DEBUG);
 502
 503                         // Handling the pubsubhubbub requests
 504                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 505                 }
 506
 507                 Logger::log('notifier: calling hooks for ' . $cmd . ' ' . $item_id, Logger::DEBUG);
 508
 509                 if ($normal_mode) {
 510                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 511                 }
 512
 513                 Addon::callHooks('notifier_end',$target_item);
 514
 515                 return;
 516         }
 517
 518         private static function activityPubDelivery($a, $cmd, $item_id, $uid, $target_item, $parent)
 519         {
 520                 $inboxes = [];
 521                 $personal = false;
 522
 523                 if ($target_item['origin']) {
 524                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 525                         Logger::log('Origin item ' . $item_id . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 526                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 527                         Logger::log('Remote item ' . $item_id . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 528                         return;
 529                 } else {
 530                         // Remote items are transmitted via the personal inboxes.
 531                         // Doing so ensures that the dedicated receiver will get the message.
 532                         $personal = true;
 533                         Logger::log('Remote item ' . $item_id . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 534                 }
 535
 536                 if ($parent['origin']) {
 537                         $parent_inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, $personal);
 538                         $inboxes = array_merge($inboxes, $parent_inboxes);
 539                 }
 540
 541                 if (empty($inboxes)) {
 542                         Logger::log('No inboxes found for item ' . $item_id . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 543                         return;
 544                 }
 545
 546                 // Fill the item cache
 547                 ActivityPub\Transmitter::createCachedActivityFromItem($item_id, true);
 548
 549                 foreach ($inboxes as $inbox) {
 550                         Logger::log('Deliver ' . $item_id .' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 551
 552                         Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 553                                         'APDelivery', $cmd, $item_id, $inbox, $uid);
 554                 }
 555         }
 556
 557         private static function isForumPost($item, $owner) {
 558                 if (($item['author-id'] == $item['owner-id']) ||
 559                         ($owner['id'] == $item['contact-id']) ||
 560                         ($item['uri'] != $item['parent-uri'])) {
 561                         return false;
 562                 }
 563
 564                 $fields = ['forum', 'prv'];
 565                 $condition = ['id' => $item['contact-id']];
 566                 $contact = DBA::selectFirst('contact', $fields, $condition);
 567                 if (!DBA::isResult($contact)) {
 568                         // Should never happen
 569                         return false;
 570                 }
 571
 572                 // Is the post from a forum?
 573                 return ($contact['forum'] || $contact['prv']);
 574         }
 575 }