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 /*
  28  * The notifier is typically called with:
  29  *
  30  *              Worker::add(PRIORITY_HIGH, "Notifier", COMMAND, ITEM_ID);
  31  *
  32  * where COMMAND is one of the following:
  33  *
  34  *              activity                                (in diaspora.php, dfrn_confirm.php, profiles.php)
  35  *              comment-import                  (in diaspora.php, items.php)
  36  *              comment-new                             (in item.php)
  37  *              drop                                    (in diaspora.php, items.php, photos.php)
  38  *              edit_post                               (in item.php)
  39  *              event                                   (in events.php)
  40  *              like                                    (in like.php, poke.php)
  41  *              mail                                    (in message.php)
  42  *              suggest                                 (in fsuggest.php)
  43  *              tag                                             (in photos.php, poke.php, tagger.php)
  44  *              tgroup                                  (in items.php)
  45  *              wall-new                                (in photos.php, item.php)
  46  *              removeme                                (in Contact.php)
  47  *              relocate                                (in uimport.php)
  48  *
  49  * and ITEM_ID is the id of the item in the database that needs to be sent to others.
  50  */
  51
  52 class Notifier
  53 {
  54         public static function execute($cmd, $item_id)
  55         {
  56                 $a = BaseObject::getApp();
  57
  58                 Logger::log('Invoked: ' . $cmd . ': ' . $item_id, Logger::DEBUG);
  59
  60                 $top_level = false;
  61                 $recipients = [];
  62                 $url_recipients = [];
  63
  64                 $normal_mode = true;
  65                 $recipients_relocate = [];
  66
  67                 if ($cmd == Delivery::MAIL) {
  68                         $normal_mode = false;
  69                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $item_id]);
  70                         if (!DBA::isResult($message)) {
  71                                 return;
  72                         }
  73                         $uid = $message['uid'];
  74                         $recipients[] = $message['contact-id'];
  75                 } elseif ($cmd == Delivery::SUGGESTION) {
  76                         $normal_mode = false;
  77                         $suggest = DBA::selectFirst('fsuggest', ['uid', 'cid'], ['id' => $item_id]);
  78                         if (!DBA::isResult($suggest)) {
  79                                 return;
  80                         }
  81                         $uid = $suggest['uid'];
  82                         $recipients[] = $suggest['cid'];
  83                 } elseif ($cmd == Delivery::REMOVAL) {
  84                         $r = q("SELECT `contact`.*, `user`.`prvkey` AS `uprvkey`,
  85                                         `user`.`timezone`, `user`.`nickname`, `user`.`sprvkey`, `user`.`spubkey`,
  86                                         `user`.`page-flags`, `user`.`prvnets`, `user`.`account-type`, `user`.`guid`
  87                                 FROM `contact` INNER JOIN `user` ON `user`.`uid` = `contact`.`uid`
  88                                         WHERE `contact`.`uid` = %d AND `contact`.`self` LIMIT 1",
  89                                         intval($item_id));
  90                         if (!$r) {
  91                                 return;
  92                         }
  93                         $user = $r[0];
  94
  95                         $r = q("SELECT * FROM `contact` WHERE NOT `self` AND `uid` = %d", intval($item_id));
  96                         if (!$r) {
  97                                 return;
  98                         }
  99                         foreach ($r as $contact) {
 100                                 Contact::terminateFriendship($user, $contact, true);
 101                         }
 102
 103                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 104                         foreach ($inboxes as $inbox) {
 105                                 Logger::log('Account removal for user ' . $item_id . ' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 106                                 Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $a->queue['created'], 'dont_fork' => true],
 107                                         'APDelivery', Delivery::REMOVAL, '', $inbox, $item_id);
 108                         }
 109
 110                         return;
 111                 } elseif ($cmd == Delivery::RELOCATION) {
 112                         $normal_mode = false;
 113                         $uid = $item_id;
 114
 115                         $recipients_relocate = q("SELECT * FROM `contact` WHERE `uid` = %d AND NOT `self` AND `network` IN ('%s', '%s')",
 116                                                 intval($uid), Protocol::DFRN, Protocol::DIASPORA);
 117                 } else {
 118                         // find ancestors
 119                         $condition = ['id' => $item_id, 'visible' => true, 'moderated' => false];
 120                         $target_item = Item::selectFirst([], $condition);
 121
 122                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
 123                                 return;
 124                         }
 125
 126                         $parent_id = intval($target_item['parent']);
 127
 128                         if (!empty($target_item['contact-uid'])) {
 129                                 $uid = $target_item['contact-uid'];
 130                         } elseif (!empty($target_item['uid'])) {
 131                                 $uid = $target_item['uid'];
 132                         } else {
 133                                 Logger::log('Only public users for item ' . $item_id, Logger::DEBUG);
 134                                 return;
 135                         }
 136
 137                         $updated = $target_item['edited'];
 138
 139                         $condition = ['parent' => $parent_id, 'visible' => true, 'moderated' => false];
 140                         $params = ['order' => ['id']];
 141                         $ret = Item::select([], $condition, $params);
 142
 143                         if (!DBA::isResult($ret)) {
 144                                 return;
 145                         }
 146
 147                         $items = Item::inArray($ret);
 148
 149                         // avoid race condition with deleting entries
 150                         if ($items[0]['deleted']) {
 151                                 foreach ($items as $item) {
 152                                         $item['deleted'] = 1;
 153                                 }
 154                         }
 155
 156                         if ((count($items) == 1) && ($items[0]['id'] === $target_item['id']) && ($items[0]['uri'] === $items[0]['parent-uri'])) {
 157                                 Logger::log('Top level post');
 158                                 $top_level = true;
 159                         }
 160                 }
 161
 162                 $owner = User::getOwnerDataById($uid);
 163                 if (!$owner) {
 164                         return;
 165                 }
 166
 167                 $walltowall = ($top_level && ($owner['id'] != $items[0]['contact-id']) ? true : false);
 168
 169                 // Should the post be transmitted to Diaspora?
 170                 $diaspora_delivery = true;
 171
 172                 // If this is a public conversation, notify the feed hub
 173                 $public_message = true;
 174
 175                 // Do a PuSH
 176                 $push_notify = false;
 177
 178                 // Deliver directly to a forum, don't PuSH
 179                 $direct_forum_delivery = false;
 180
 181                 $followup = false;
 182                 $recipients_followup = [];
 183
 184                 if (!in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION, Delivery::RELOCATION])) {
 185                         $parent = $items[0];
 186
 187                         self::activityPubDelivery($a, $cmd, $item_id, $uid, $target_item, $parent);
 188
 189                         $fields = ['network', 'author-id', 'owner-id'];
 190                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 191                         $thr_parent = Item::selectFirst($fields, $condition);
 192
 193                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 194
 195                         // This is IMPORTANT!!!!
 196
 197                         // We will only send a "notify owner to relay" or followup message if the referenced post
 198                         // originated on our system by virtue of having our hostname somewhere
 199                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 200
 201                         // if $parent['wall'] == 1 we will already have the parent message in our array
 202                         // and we will relay the whole lot.
 203
 204                         $localhost = str_replace('www.','',$a->getHostName());
 205                         if (strpos($localhost,':')) {
 206                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 207                         }
 208                         /**
 209                          *
 210                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 211                          * have been known to cause runaway conditions which affected several servers, along with
 212                          * permissions issues.
 213                          *
 214                          */
 215
 216                         $relay_to_owner = false;
 217
 218                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 219                                 $relay_to_owner = true;
 220                         }
 221
 222
 223                         if (($cmd === 'uplink') && (intval($parent['forum_mode']) == 1) && !$top_level) {
 224                                 $relay_to_owner = true;
 225                         }
 226
 227                         // until the 'origin' flag has been in use for several months
 228                         // we will just use it as a fallback test
 229                         // later we will be able to use it as the primary test of whether or not to relay.
 230
 231                         if (!$target_item['origin']) {
 232                                 $relay_to_owner = false;
 233                         }
 234                         if ($parent['origin']) {
 235                                 $relay_to_owner = false;
 236                         }
 237
 238                         // Special treatment for forum posts
 239                         if (self::isForumPost($target_item, $owner)) {
 240                                 $relay_to_owner = true;
 241                                 $direct_forum_delivery = true;
 242                         }
 243
 244                         // Avoid that comments in a forum thread are sent to OStatus
 245                         if (self::isForumPost($parent, $owner)) {
 246                                 $direct_forum_delivery = true;
 247                         }
 248
 249                         if ($relay_to_owner) {
 250                                 // local followup to remote post
 251                                 $followup = true;
 252                                 $public_message = false; // not public
 253                                 $recipients = [$parent['contact-id']];
 254                                 $recipients_followup  = [$parent['contact-id']];
 255
 256                                 Logger::log('Followup ' . $target_item['guid'] . ' to ' . $parent['contact-id'], Logger::DEBUG);
 257
 258                                 //if (!$target_item['private'] && $target_item['wall'] &&
 259                                 if (!$target_item['private'] &&
 260                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 261                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 262                                         $push_notify = true;
 263
 264                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 265                                         $push_notify = true;
 266
 267                                         if ($parent["network"] == Protocol::OSTATUS) {
 268                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 269                                                 // Currently it is work at progress
 270                                                 $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `network` = '%s' AND NOT `blocked` AND NOT `pending` AND NOT `archive`",
 271                                                         intval($uid),
 272                                                         DBA::escape(Protocol::DFRN)
 273                                                 );
 274                                                 if (DBA::isResult($r)) {
 275                                                         foreach ($r as $rr) {
 276                                                                 $recipients_followup[] = $rr['id'];
 277                                                         }
 278                                                 }
 279                                         }
 280                                 }
 281
 282                                 if ($direct_forum_delivery) {
 283                                         $push_notify = false;
 284                                 }
 285
 286                                 Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
 287                         } else {
 288                                 $followup = false;
 289
 290                                 Logger::log('Distributing directly ' . $target_item["guid"], Logger::DEBUG);
 291
 292                                 // don't send deletions onward for other people's stuff
 293
 294                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 295                                         Logger::log('Ignoring delete notification for non-wall item');
 296                                         return;
 297                                 }
 298
 299                                 if (strlen($parent['allow_cid'])
 300                                         || strlen($parent['allow_gid'])
 301                                         || strlen($parent['deny_cid'])
 302                                         || strlen($parent['deny_gid'])) {
 303                                         $public_message = false; // private recipients, not public
 304                                 }
 305
 306                                 $allow_people = expand_acl($parent['allow_cid']);
 307                                 $allow_groups = Group::expand(expand_acl($parent['allow_gid']),true);
 308                                 $deny_people  = expand_acl($parent['deny_cid']);
 309                                 $deny_groups  = Group::expand(expand_acl($parent['deny_gid']));
 310
 311                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 312                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 313
 314                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== 'uplink')) {
 315                                         Worker::add($a->queue['priority'], 'Notifier', 'uplink', $item_id);
 316                                 }
 317
 318                                 foreach ($items as $item) {
 319                                         $recipients[] = $item['contact-id'];
 320                                         // pull out additional tagged people to notify (if public message)
 321                                         if ($public_message && strlen($item['inform'])) {
 322                                                 $people = explode(',',$item['inform']);
 323                                                 foreach ($people as $person) {
 324                                                         if (substr($person,0,4) === 'cid:') {
 325                                                                 $recipients[] = intval(substr($person,4));
 326                                                         } else {
 327                                                                 $url_recipients[] = substr($person,4);
 328                                                         }
 329                                                 }
 330                                         }
 331                                 }
 332
 333                                 if (count($url_recipients)) {
 334                                         Logger::log('Deliver ' . $target_item["guid"] . ' to _recipients ' . json_decode($url_recipients));
 335                                 }
 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, $deny);
 340                         }
 341
 342                         // If the thread parent is OStatus then do some magic to distribute the messages.
 343                         // We have not only to look at the parent, since it could be a Friendica thread.
 344                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 345                                 $diaspora_delivery = false;
 346
 347                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 348
 349                                 // Send a salmon to the parent author
 350                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 351                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 352                                         Logger::log('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 353                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 354                                 }
 355
 356                                 // Send a salmon to the parent owner
 357                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 358                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 359                                         Logger::log('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 360                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 361                                 }
 362
 363                                 // Send a salmon notification to every person we mentioned in the post
 364                                 $arr = explode(',',$target_item['tag']);
 365                                 foreach ($arr as $x) {
 366                                         //Logger::log('Checking tag '.$x, Logger::DEBUG);
 367                                         $matches = null;
 368                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 369                                                         $probed_contact = Probe::uri($matches[1]);
 370                                                 if ($probed_contact["notify"] != "") {
 371                                                         Logger::log('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 372                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 373                                                 }
 374                                         }
 375                                 }
 376
 377                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 378                                 $networks = [Protocol::OSTATUS, Protocol::DFRN];
 379                         } else {
 380                                 $networks = [Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 381                         }
 382                 } else {
 383                         $public_message = false;
 384                 }
 385
 386                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 387                 if (!empty($target_item) && function_exists('imap_open') && !Config::get('system','imap_disabled')) {
 388                         if (!strlen($target_item['allow_cid']) && !strlen($target_item['allow_gid'])
 389                                 && !strlen($target_item['deny_cid']) && !strlen($target_item['deny_gid'])
 390                                 && intval($target_item['pubmail'])) {
 391                                 $r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `network` = '%s'",
 392                                         intval($uid),
 393                                         DBA::escape(Protocol::MAIL)
 394                                 );
 395                                 if (DBA::isResult($r)) {
 396                                         foreach ($r as $rr) {
 397                                                 $recipients[] = $rr['id'];
 398                                         }
 399                                 }
 400                         }
 401                 }
 402
 403                 if (($cmd == Delivery::RELOCATION)) {
 404                         $contacts = $recipients_relocate;
 405                 } else {
 406                         if ($followup) {
 407                                 $recipients = $recipients_followup;
 408                         }
 409                         $condition = ['id' => $recipients, 'self' => false,
 410                                 'blocked' => false, 'pending' => false, 'archive' => false];
 411                         if (!empty($networks)) {
 412                                 $condition['network'] = $networks;
 413                         }
 414                         $result = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
 415                         $contacts = DBA::toArray($result);
 416                 }
 417
 418                 $conversants = [];
 419                 $batch_delivery = false;
 420
 421                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 422                         $r1 = [];
 423
 424                         if ($diaspora_delivery) {
 425                                 $batch_delivery = true;
 426
 427                                 $r1 = q("SELECT `batch`, ANY_VALUE(`id`) AS `id`, ANY_VALUE(`name`) AS `name`, ANY_VALUE(`network`) AS `network`
 428                                         FROM `contact` WHERE `network` = '%s' AND `batch` != ''
 429                                         AND `uid` = %d AND `rel` != %d AND NOT `blocked` AND NOT `pending` AND NOT `archive` GROUP BY `batch`",
 430                                         DBA::escape(Protocol::DIASPORA),
 431                                         intval($owner['uid']),
 432                                         intval(Contact::SHARING)
 433                                 );
 434
 435                                 // Fetch the participation list
 436                                 // The function will ensure that there are no duplicates
 437                                 $r1 = Diaspora::participantsForThread($item_id, $r1);
 438
 439                                 // Add the relay to the list, avoid duplicates.
 440                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 441                                 if (!$followup && !self::isForumPost($target_item, $owner)) {
 442                                         $r1 = Diaspora::relayList($item_id, $r1);
 443                                 }
 444                         }
 445
 446                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 447                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 448
 449                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'name', 'network'], $condition));
 450
 451                         $r = array_merge($r2, $r1);
 452
 453                         if (DBA::isResult($r)) {
 454                                 foreach ($r as $rr) {
 455                                         $conversants[] = $rr['id'];
 456                                         Logger::log('Public delivery of item ' . $target_item["guid"] . ' (' . $item_id . ') to ' . json_encode($rr), Logger::DEBUG);
 457
 458                                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 459                                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 460                                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 461                                         if ($rr['network'] == Protocol::DIASPORA) {
 462                                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 463                                         } else {
 464                                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 465                                         }
 466                                         Worker::add($deliver_options, 'Delivery', $cmd, $item_id, (int)$rr['id']);
 467                                 }
 468                         }
 469
 470                         $push_notify = true;
 471                 }
 472
 473                 // delivery loop
 474                 if (DBA::isResult($contacts)) {
 475                         foreach ($contacts as $contact) {
 476                                 // Don't deliver to Diaspora if it already had been done as batch delivery
 477                                 if (($contact['network'] == Protocol::DIASPORA) && $batch_delivery) {
 478                                         Logger::log('Already delivered  id ' . $item_id . ' via batch to ' . json_encode($contact), Logger::DEBUG);
 479                                         continue;
 480                                 }
 481
 482                                 // Don't deliver to folks who have already been delivered to
 483                                 if (in_array($contact['id'], $conversants)) {
 484                                         Logger::log('Already delivered id ' . $item_id. ' to ' . json_encode($contact), Logger::DEBUG);
 485                                         continue;
 486                                 }
 487
 488                                 Logger::log('Delivery of item ' . $item_id . ' to ' . json_encode($contact), Logger::DEBUG);
 489
 490                                 // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 491                                 // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 492                                 // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 493                                 if ($contact['network'] == Protocol::DIASPORA) {
 494                                         $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 495                                 } else {
 496                                         $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 497                                 }
 498                                 Worker::add($deliver_options, 'Delivery', $cmd, $item_id, (int)$contact['id']);
 499                         }
 500                 }
 501
 502                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 503                 // They are especially used for notifications to OStatus users that don't follow us.
 504                 if (!Config::get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && $normal_mode) {
 505                         $slap = OStatus::salmon($target_item, $owner);
 506                         foreach ($url_recipients as $url) {
 507                                 if ($url) {
 508                                         Logger::log('Salmon delivery of item ' . $item_id . ' to ' . $url);
 509                                         $deliver_status = Salmon::slapper($owner, $url, $slap);
 510                                         /// @TODO Redeliver/queue these items on failure, though there is no contact record
 511                                 }
 512                         }
 513                 }
 514
 515                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 516                 if ($push_notify) {
 517                         Logger::log('Activating internal PuSH for item '.$item_id, Logger::DEBUG);
 518
 519                         // Handling the pubsubhubbub requests
 520                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 521                 }
 522
 523                 Logger::log('Calling hooks for ' . $cmd . ' ' . $item_id, Logger::DEBUG);
 524
 525                 if ($normal_mode) {
 526                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 527                 }
 528
 529                 Addon::callHooks('notifier_end',$target_item);
 530
 531                 return;
 532         }
 533
 534         private static function activityPubDelivery($a, $cmd, $item_id, $uid, $target_item, $parent)
 535         {
 536                 $inboxes = [];
 537
 538                 if ($target_item['origin']) {
 539                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 540                         Logger::log('Origin item ' . $item_id . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 541                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 542                         Logger::log('Remote item ' . $item_id . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 543                         return;
 544                 } elseif ($parent['origin']) {
 545                         // Remote items are transmitted via the personal inboxes.
 546                         // Doing so ensures that the dedicated receiver will get the message.
 547                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, true, $item_id);
 548                         Logger::log('Remote item ' . $item_id . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 549                 }
 550
 551                 if (empty($inboxes)) {
 552                         Logger::log('No inboxes found for item ' . $item_id . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 553                         return;
 554                 }
 555
 556                 // Fill the item cache
 557                 ActivityPub\Transmitter::createCachedActivityFromItem($item_id, true);
 558
 559                 foreach ($inboxes as $inbox) {
 560                         Logger::log('Deliver ' . $item_id .' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 561
 562                         Worker::add(['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true],
 563                                         'APDelivery', $cmd, $item_id, $inbox, $uid);
 564                 }
 565         }
 566
 567         private static function isForumPost($item, $owner) {
 568                 if (($item['author-id'] == $item['owner-id']) ||
 569                         ($owner['id'] == $item['contact-id']) ||
 570                         ($item['uri'] != $item['parent-uri'])) {
 571                         return false;
 572                 }
 573
 574                 $fields = ['forum', 'prv'];
 575                 $condition = ['id' => $item['contact-id']];
 576                 $contact = DBA::selectFirst('contact', $fields, $condition);
 577                 if (!DBA::isResult($contact)) {
 578                         // Should never happen
 579                         return false;
 580                 }
 581
 582                 // Is the post from a forum?
 583                 return ($contact['forum'] || $contact['prv']);
 584         }
 585 }