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\Config;
   9 use Friendica\Core\Hook;
  10 use Friendica\Core\Logger;
  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/items.php';
  27
  28 /*
  29  * The notifier is typically called with:
  30  *
  31  *              Worker::add(PRIORITY_HIGH, "Notifier", COMMAND, ITEM_ID);
  32  *
  33  * where COMMAND is one of the following:
  34  *
  35  *              activity                                (in diaspora.php, dfrn_confirm.php, profiles.php)
  36  *              comment-import                  (in diaspora.php, items.php)
  37  *              comment-new                             (in item.php)
  38  *              drop                                    (in diaspora.php, items.php, photos.php)
  39  *              edit_post                               (in item.php)
  40  *              event                                   (in events.php)
  41  *              like                                    (in like.php, poke.php)
  42  *              mail                                    (in message.php)
  43  *              suggest                                 (in fsuggest.php)
  44  *              tag                                             (in photos.php, poke.php, tagger.php)
  45  *              tgroup                                  (in items.php)
  46  *              wall-new                                (in photos.php, item.php)
  47  *              removeme                                (in Contact.php)
  48  *              relocate                                (in uimport.php)
  49  *
  50  * and ITEM_ID is the id of the item in the database that needs to be sent to others.
  51  */
  52
  53 class Notifier
  54 {
  55         public static function execute($cmd, $target_id)
  56         {
  57                 $a = BaseObject::getApp();
  58
  59                 Logger::log('Invoked: ' . $cmd . ': ' . $target_id, Logger::DEBUG);
  60
  61                 $top_level = false;
  62                 $recipients = [];
  63                 $url_recipients = [];
  64
  65                 $delivery_contacts_stmt = null;
  66                 $target_item = [];
  67                 $items = [];
  68
  69                 if ($cmd == Delivery::MAIL) {
  70                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $target_id]);
  71                         if (!DBA::isResult($message)) {
  72                                 return;
  73                         }
  74                         $uid = $message['uid'];
  75                         $recipients[] = $message['contact-id'];
  76                 } elseif ($cmd == Delivery::SUGGESTION) {
  77                         $suggest = DBA::selectFirst('fsuggest', ['uid', 'cid'], ['id' => $target_id]);
  78                         if (!DBA::isResult($suggest)) {
  79                                 return;
  80                         }
  81                         $uid = $suggest['uid'];
  82                         $recipients[] = $suggest['cid'];
  83                 } elseif ($cmd == Delivery::REMOVAL) {
  84                         return self::notifySelfRemoval($target_id, $a->queue['priority'], $a->queue['created']);
  85                 } elseif ($cmd == Delivery::RELOCATION) {
  86                         $uid = $target_id;
  87
  88                         $condition = ['uid' => $target_id, 'self' => false, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  89                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
  90                 } else {
  91                         // find ancestors
  92                         $condition = ['id' => $target_id, 'visible' => true, 'moderated' => false];
  93                         $target_item = Item::selectFirst([], $condition);
  94
  95                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
  96                                 return;
  97                         }
  98
  99                         if (!empty($target_item['contact-uid'])) {
 100                                 $uid = $target_item['contact-uid'];
 101                         } elseif (!empty($target_item['uid'])) {
 102                                 $uid = $target_item['uid'];
 103                         } else {
 104                                 Logger::log('Only public users for item ' . $target_id, Logger::DEBUG);
 105                                 return;
 106                         }
 107
 108                         $condition = ['parent' => $target_item['parent'], 'visible' => true, 'moderated' => false];
 109                         $params = ['order' => ['id']];
 110                         $items_stmt = Item::select([], $condition, $params);
 111                         if (!DBA::isResult($items_stmt)) {
 112                                 return;
 113                         }
 114
 115                         $items = Item::inArray($items_stmt);
 116
 117                         // avoid race condition with deleting entries
 118                         if ($items[0]['deleted']) {
 119                                 foreach ($items as $item) {
 120                                         $item['deleted'] = 1;
 121                                 }
 122                         }
 123
 124                         if ((count($items) == 1) && ($items[0]['id'] === $target_item['id']) && ($items[0]['uri'] === $items[0]['parent-uri'])) {
 125                                 Logger::log('Top level post');
 126                                 $top_level = true;
 127                         }
 128                 }
 129
 130                 $owner = User::getOwnerDataById($uid);
 131                 if (!$owner) {
 132                         return;
 133                 }
 134
 135                 // Should the post be transmitted to Diaspora?
 136                 $diaspora_delivery = true;
 137
 138                 // If this is a public conversation, notify the feed hub
 139                 $public_message = true;
 140
 141                 // Do a PuSH
 142                 $push_notify = false;
 143
 144                 // Deliver directly to a forum, don't PuSH
 145                 $direct_forum_delivery = false;
 146
 147                 $followup = false;
 148                 $recipients_followup = [];
 149
 150                 if (!empty($target_item) && !empty($items)) {
 151                         $parent = $items[0];
 152
 153                         self::activityPubDelivery($cmd, $target_item, $parent, $a->queue['priority'], $a->query_string['created']);
 154
 155                         $fields = ['network', 'author-id', 'owner-id'];
 156                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 157                         $thr_parent = Item::selectFirst($fields, $condition);
 158
 159                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 160
 161                         // This is IMPORTANT!!!!
 162
 163                         // We will only send a "notify owner to relay" or followup message if the referenced post
 164                         // originated on our system by virtue of having our hostname somewhere
 165                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 166
 167                         // if $parent['wall'] == 1 we will already have the parent message in our array
 168                         // and we will relay the whole lot.
 169
 170                         $localhost = str_replace('www.','',$a->getHostName());
 171                         if (strpos($localhost,':')) {
 172                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 173                         }
 174                         /**
 175                          *
 176                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 177                          * have been known to cause runaway conditions which affected several servers, along with
 178                          * permissions issues.
 179                          *
 180                          */
 181
 182                         $relay_to_owner = false;
 183
 184                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 185                                 $relay_to_owner = true;
 186                         }
 187
 188
 189                         if (($cmd === 'uplink') && (intval($parent['forum_mode']) == 1) && !$top_level) {
 190                                 $relay_to_owner = true;
 191                         }
 192
 193                         // until the 'origin' flag has been in use for several months
 194                         // we will just use it as a fallback test
 195                         // later we will be able to use it as the primary test of whether or not to relay.
 196
 197                         if (!$target_item['origin']) {
 198                                 $relay_to_owner = false;
 199                         }
 200                         if ($parent['origin']) {
 201                                 $relay_to_owner = false;
 202                         }
 203
 204                         // Special treatment for forum posts
 205                         if (self::isForumPost($target_item, $owner)) {
 206                                 $relay_to_owner = true;
 207                                 $direct_forum_delivery = true;
 208                         }
 209
 210                         // Avoid that comments in a forum thread are sent to OStatus
 211                         if (self::isForumPost($parent, $owner)) {
 212                                 $direct_forum_delivery = true;
 213                         }
 214
 215                         if ($relay_to_owner) {
 216                                 // local followup to remote post
 217                                 $followup = true;
 218                                 $public_message = false; // not public
 219                                 $recipients = [$parent['contact-id']];
 220                                 $recipients_followup  = [$parent['contact-id']];
 221
 222                                 Logger::log('Followup ' . $target_item['guid'] . ' to ' . $parent['contact-id'], Logger::DEBUG);
 223
 224                                 //if (!$target_item['private'] && $target_item['wall'] &&
 225                                 if (!$target_item['private'] &&
 226                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 227                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 228                                         $push_notify = true;
 229
 230                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 231                                         $push_notify = true;
 232
 233                                         if ($parent["network"] == Protocol::OSTATUS) {
 234                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 235                                                 // Currently it is work at progress
 236                                                 $condition = ['uid' => $uid, 'network' => Protocol::DFRN, 'blocked' => false, 'pending' => false, 'archive' => false];
 237                                                 $followup_contacts_stmt = DBA::select('contact', ['id'], $condition);
 238                                                 while($followup_contact = DBA::fetch($followup_contacts_stmt)) {
 239                                                         $recipients_followup[] = $followup_contact['id'];
 240                                                 }
 241                                                 DBA::close($followup_contacts_stmt);
 242                                         }
 243                                 }
 244
 245                                 if ($direct_forum_delivery) {
 246                                         $push_notify = false;
 247                                 }
 248
 249                                 Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
 250                         } else {
 251                                 $followup = false;
 252
 253                                 Logger::log('Distributing directly ' . $target_item["guid"], Logger::DEBUG);
 254
 255                                 // don't send deletions onward for other people's stuff
 256
 257                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 258                                         Logger::log('Ignoring delete notification for non-wall item');
 259                                         return;
 260                                 }
 261
 262                                 if (strlen($parent['allow_cid'])
 263                                         || strlen($parent['allow_gid'])
 264                                         || strlen($parent['deny_cid'])
 265                                         || strlen($parent['deny_gid'])) {
 266                                         $public_message = false; // private recipients, not public
 267                                 }
 268
 269                                 $allow_people = expand_acl($parent['allow_cid']);
 270                                 $allow_groups = Group::expand(expand_acl($parent['allow_gid']),true);
 271                                 $deny_people  = expand_acl($parent['deny_cid']);
 272                                 $deny_groups  = Group::expand(expand_acl($parent['deny_gid']));
 273
 274                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 275                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 276
 277                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== 'uplink')) {
 278                                         Worker::add($a->queue['priority'], 'Notifier', 'uplink', $target_id);
 279                                 }
 280
 281                                 foreach ($items as $item) {
 282                                         $recipients[] = $item['contact-id'];
 283                                         // pull out additional tagged people to notify (if public message)
 284                                         if ($public_message && strlen($item['inform'])) {
 285                                                 $people = explode(',',$item['inform']);
 286                                                 foreach ($people as $person) {
 287                                                         if (substr($person,0,4) === 'cid:') {
 288                                                                 $recipients[] = intval(substr($person,4));
 289                                                         } else {
 290                                                                 $url_recipients[] = substr($person,4);
 291                                                         }
 292                                                 }
 293                                         }
 294                                 }
 295
 296                                 if (count($url_recipients)) {
 297                                         Logger::log('Deliver ' . $target_item["guid"] . ' to _recipients ' . json_encode($url_recipients));
 298                                 }
 299
 300                                 $recipients = array_unique(array_merge($recipients, $allow_people, $allow_groups));
 301                                 $deny = array_unique(array_merge($deny_people, $deny_groups));
 302                                 $recipients = array_diff($recipients, $deny);
 303
 304                                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 305                                 if (
 306                                         function_exists('imap_open')
 307                                         && !Config::get('system','imap_disabled')
 308                                         && $public_message
 309                                         && intval($target_item['pubmail'])
 310                                 ) {
 311                                         $mail_contacts_stmt = DBA::select('contact', ['id'], ['uid' => $uid, 'network' => Protocol::MAIL]);
 312                                         while ($mail_contact = DBA::fetch($mail_contacts_stmt)) {
 313                                                 $recipients[] = $mail_contact['id'];
 314                                         }
 315                                         DBA::close($mail_contacts_stmt);
 316                                 }
 317                         }
 318
 319                         // If the thread parent is OStatus then do some magic to distribute the messages.
 320                         // We have not only to look at the parent, since it could be a Friendica thread.
 321                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 322                                 $diaspora_delivery = false;
 323
 324                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 325
 326                                 // Send a salmon to the parent author
 327                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 328                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 329                                         Logger::log('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 330                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 331                                 }
 332
 333                                 // Send a salmon to the parent owner
 334                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 335                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 336                                         Logger::log('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 337                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 338                                 }
 339
 340                                 // Send a salmon notification to every person we mentioned in the post
 341                                 $arr = explode(',',$target_item['tag']);
 342                                 foreach ($arr as $x) {
 343                                         //Logger::log('Checking tag '.$x, Logger::DEBUG);
 344                                         $matches = null;
 345                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 346                                                         $probed_contact = Probe::uri($matches[1]);
 347                                                 if ($probed_contact["notify"] != "") {
 348                                                         Logger::log('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 349                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 350                                                 }
 351                                         }
 352                                 }
 353
 354                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 355                                 $networks = [Protocol::OSTATUS, Protocol::DFRN];
 356                         } else {
 357                                 $networks = [Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 358                         }
 359                 } else {
 360                         $public_message = false;
 361                 }
 362
 363                 if (empty($delivery_contacts_stmt)) {
 364                         if ($followup) {
 365                                 $recipients = $recipients_followup;
 366                         }
 367                         $condition = ['id' => $recipients, 'self' => false,
 368                                 'blocked' => false, 'pending' => false, 'archive' => false];
 369                         if (!empty($networks)) {
 370                                 $condition['network'] = $networks;
 371                         }
 372                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
 373                 }
 374
 375                 $conversants = [];
 376                 $batch_delivery = false;
 377
 378                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 379                         $relay_list = [];
 380
 381                         if ($diaspora_delivery) {
 382                                 $batch_delivery = true;
 383
 384                                 $relay_list_stmt = DBA::p(
 385                                         "SELECT
 386                                         `batch`,
 387                                         ANY_VALUE(`id`) AS `id`,
 388                                         ANY_VALUE(`name`) AS `name`,
 389                                         ANY_VALUE(`network`) AS `network`
 390                                         FROM `contact`
 391                                         WHERE `network` = ?
 392                                         AND `batch` != ''
 393                                         AND `uid` = ?
 394                                         AND `rel` != ?
 395                                         AND NOT `blocked`
 396                                         AND NOT `pending`
 397                                         AND NOT `archive`
 398                                         GROUP BY `batch`",
 399                                         Protocol::DIASPORA,
 400                                         $owner['uid'],
 401                                         Contact::SHARING
 402                                 );
 403                                 $relay_list = DBA::toArray($relay_list_stmt);
 404
 405                                 // Fetch the participation list
 406                                 // The function will ensure that there are no duplicates
 407                                 $relay_list = Diaspora::participantsForThread($target_id, $relay_list);
 408
 409                                 // Add the relay to the list, avoid duplicates.
 410                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 411                                 if (!$followup && !self::isForumPost($target_item, $owner)) {
 412                                         $relay_list = Diaspora::relayList($target_id, $relay_list);
 413                                 }
 414                         }
 415
 416                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 417                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 418
 419                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'name', 'network'], $condition));
 420
 421                         $r = array_merge($r2, $relay_list);
 422
 423                         if (DBA::isResult($r)) {
 424                                 foreach ($r as $rr) {
 425                                         $conversants[] = $rr['id'];
 426                                         Logger::log('Public delivery of item ' . $target_item["guid"] . ' (' . $target_id . ') to ' . json_encode($rr), Logger::DEBUG);
 427
 428                                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 429                                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 430                                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 431                                         if ($rr['network'] == Protocol::DIASPORA) {
 432                                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 433                                         } else {
 434                                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 435                                         }
 436                                         Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$rr['id']);
 437                                 }
 438                         }
 439
 440                         $push_notify = true;
 441                 }
 442
 443                 // delivery loop
 444                 while ($contact = DBA::fetch($delivery_contacts_stmt)) {
 445                         // Don't deliver to Diaspora if it already had been done as batch delivery
 446                         if (($contact['network'] == Protocol::DIASPORA) && $batch_delivery) {
 447                                 Logger::log('Already delivered  id ' . $target_id . ' via batch to ' . json_encode($contact), Logger::DEBUG);
 448                                 continue;
 449                         }
 450
 451                         // Don't deliver to folks who have already been delivered to
 452                         if (in_array($contact['id'], $conversants)) {
 453                                 Logger::log('Already delivered id ' . $target_id. ' to ' . json_encode($contact), Logger::DEBUG);
 454                                 continue;
 455                         }
 456
 457                         Logger::log('Delivery of item ' . $target_id . ' to ' . json_encode($contact), Logger::DEBUG);
 458
 459                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 460                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 461                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 462                         if ($contact['network'] == Protocol::DIASPORA) {
 463                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 464                         } else {
 465                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 466                         }
 467                         Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$contact['id']);
 468                 }
 469                 DBA::close($delivery_contacts_stmt);
 470
 471
 472                 $url_recipients = array_filter($url_recipients);
 473                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 474                 // They are especially used for notifications to OStatus users that don't follow us.
 475                 if (!Config::get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && !empty($target_item)) {
 476                         $slap = OStatus::salmon($target_item, $owner);
 477                         foreach ($url_recipients as $url) {
 478                                 Logger::log('Salmon delivery of item ' . $target_id . ' to ' . $url);
 479                                 /// @TODO Redeliver/queue these items on failure, though there is no contact record
 480                                 Salmon::slapper($owner, $url, $slap);
 481                         }
 482                 }
 483
 484                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 485                 if ($push_notify) {
 486                         Logger::log('Activating internal PuSH for item '.$target_id, Logger::DEBUG);
 487
 488                         // Handling the pubsubhubbub requests
 489                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 490                 }
 491
 492                 if (!empty($target_item)) {
 493                         Logger::log('Calling hooks for ' . $cmd . ' ' . $target_id, Logger::DEBUG);
 494
 495                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 496
 497                         Hook::callAll('notifier_end', $target_item);
 498                 }
 499
 500                 return;
 501         }
 502
 503         /**
 504          * @param int    $self_user_id
 505          * @param int    $priority     The priority the Notifier queue item was created with
 506          * @param string $created      The date the Notifier queue item was created on
 507          * @return bool
 508          */
 509         private static function notifySelfRemoval($self_user_id, $priority, $created)
 510         {
 511                 $owner = User::getOwnerDataById($self_user_id);
 512                 if (!$owner) {
 513                         return false;
 514                 }
 515
 516                 $contacts_stmt = DBA::select('contact', [], ['self' => false, 'uid' => $self_user_id]);
 517                 if (!DBA::isResult($contacts_stmt)) {
 518                         return false;
 519                 }
 520
 521                 while($contact = DBA::fetch($contacts_stmt)) {
 522                         Contact::terminateFriendship($owner, $contact, true);
 523                 }
 524                 DBA::close($contacts_stmt);
 525
 526                 $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 527                 foreach ($inboxes as $inbox) {
 528                         Logger::log('Account removal for user ' . $self_user_id . ' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 529                         Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $created, 'dont_fork' => true],
 530                                 'APDelivery', Delivery::REMOVAL, '', $inbox, $self_user_id);
 531                 }
 532
 533                 return true;
 534         }
 535
 536         /**
 537          * @param string $cmd
 538          * @param array  $target_item
 539          * @param array  $parent
 540          * @param int    $priority    The priority the Notifier queue item was created with
 541          * @param string $created     The date the Notifier queue item was created on
 542          */
 543         private static function activityPubDelivery($cmd, array $target_item, array $parent, $priority, $created)
 544         {
 545                 $inboxes = [];
 546
 547                 if ($target_item['origin']) {
 548                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $target_item['contact-uid']);
 549                         Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 550                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 551                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 552                         return;
 553                 } elseif ($parent['origin']) {
 554                         // Remote items are transmitted via the personal inboxes.
 555                         // Doing so ensures that the dedicated receiver will get the message.
 556                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $target_item['contact-uid'], true, $target_item['id']);
 557                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 558                 }
 559
 560                 if (empty($inboxes)) {
 561                         Logger::log('No inboxes found for item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 562                         return;
 563                 }
 564
 565                 // Fill the item cache
 566                 ActivityPub\Transmitter::createCachedActivityFromItem($target_item['id'], true);
 567
 568                 foreach ($inboxes as $inbox) {
 569                         Logger::log('Deliver ' . $target_item['id'] .' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 570
 571                         Worker::add(['priority' => $priority, 'created' => $created, 'dont_fork' => true],
 572                                         'APDelivery', $cmd, $target_item['id'], $inbox, $target_item['contact-uid']);
 573                 }
 574         }
 575
 576         private static function isForumPost(array $item, array $owner)
 577         {
 578                 if (($item['author-id'] == $item['owner-id']) ||
 579                         ($owner['id'] == $item['contact-id']) ||
 580                         ($item['uri'] != $item['parent-uri'])) {
 581                         return false;
 582                 }
 583
 584                 $fields = ['forum', 'prv'];
 585                 $condition = ['id' => $item['contact-id']];
 586                 $contact = DBA::selectFirst('contact', $fields, $condition);
 587                 if (!DBA::isResult($contact)) {
 588                         // Should never happen
 589                         return false;
 590                 }
 591
 592                 // Is the post from a forum?
 593                 return ($contact['forum'] || $contact['prv']);
 594         }
 595 }