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\APContact;
  15 use Friendica\Model\Contact;
  16 use Friendica\Model\Conversation;
  17 use Friendica\Model\Group;
  18 use Friendica\Model\Item;
  19 use Friendica\Model\ItemDeliveryData;
  20 use Friendica\Model\PushSubscriber;
  21 use Friendica\Model\User;
  22 use Friendica\Network\Probe;
  23 use Friendica\Protocol\ActivityPub;
  24 use Friendica\Protocol\Diaspora;
  25 use Friendica\Protocol\OStatus;
  26 use Friendica\Protocol\Salmon;
  27
  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, $target_id)
  58         {
  59                 $a = BaseObject::getApp();
  60
  61                 Logger::log('Invoked: ' . $cmd . ': ' . $target_id, Logger::DEBUG);
  62
  63                 $top_level = false;
  64                 $recipients = [];
  65                 $url_recipients = [];
  66
  67                 $delivery_contacts_stmt = null;
  68                 $target_item = [];
  69                 $items = [];
  70                 $delivery_queue_count = 0;
  71
  72                 if ($cmd == Delivery::MAIL) {
  73                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $target_id]);
  74                         if (!DBA::isResult($message)) {
  75                                 return;
  76                         }
  77                         $uid = $message['uid'];
  78                         $recipients[] = $message['contact-id'];
  79                 } elseif ($cmd == Delivery::SUGGESTION) {
  80                         $suggest = DBA::selectFirst('fsuggest', ['uid', 'cid'], ['id' => $target_id]);
  81                         if (!DBA::isResult($suggest)) {
  82                                 return;
  83                         }
  84                         $uid = $suggest['uid'];
  85                         $recipients[] = $suggest['cid'];
  86                 } elseif ($cmd == Delivery::REMOVAL) {
  87                         return self::notifySelfRemoval($target_id, $a->queue['priority'], $a->queue['created']);
  88                 } elseif ($cmd == Delivery::RELOCATION) {
  89                         $uid = $target_id;
  90
  91                         $condition = ['uid' => $target_id, 'self' => false, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  92                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
  93                 } else {
  94                         // find ancestors
  95                         $condition = ['id' => $target_id, 'visible' => true, 'moderated' => false];
  96                         $target_item = Item::selectFirst([], $condition);
  97
  98                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
  99                                 return;
 100                         }
 101
 102                         if (!empty($target_item['contact-uid'])) {
 103                                 $uid = $target_item['contact-uid'];
 104                         } elseif (!empty($target_item['uid'])) {
 105                                 $uid = $target_item['uid'];
 106                         } else {
 107                                 Logger::log('Only public users for item ' . $target_id, Logger::DEBUG);
 108                                 return;
 109                         }
 110
 111                         $condition = ['parent' => $target_item['parent'], 'visible' => true, 'moderated' => false];
 112                         $params = ['order' => ['id']];
 113                         $items_stmt = Item::select([], $condition, $params);
 114                         if (!DBA::isResult($items_stmt)) {
 115                                 return;
 116                         }
 117
 118                         $items = Item::inArray($items_stmt);
 119
 120                         // avoid race condition with deleting entries
 121                         if ($items[0]['deleted']) {
 122                                 foreach ($items as $item) {
 123                                         $item['deleted'] = 1;
 124                                 }
 125                         }
 126
 127                         if ((count($items) == 1) && ($items[0]['id'] === $target_item['id']) && ($items[0]['uri'] === $items[0]['parent-uri'])) {
 128                                 Logger::log('Top level post');
 129                                 $top_level = true;
 130                         }
 131                 }
 132
 133                 $owner = User::getOwnerDataById($uid);
 134                 if (!$owner) {
 135                         return;
 136                 }
 137
 138                 // Should the post be transmitted to Diaspora?
 139                 $diaspora_delivery = true;
 140
 141                 // If this is a public conversation, notify the feed hub
 142                 $public_message = true;
 143
 144                 // Do a PuSH
 145                 $push_notify = false;
 146
 147                 // Deliver directly to a forum, don't PuSH
 148                 $direct_forum_delivery = false;
 149
 150                 $followup = false;
 151                 $recipients_followup = [];
 152
 153                 if (!empty($target_item) && !empty($items)) {
 154                         $parent = $items[0];
 155
 156                         $delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $a->queue['priority'], $a->queue['created']);
 157
 158                         $fields = ['network', 'author-id', 'owner-id'];
 159                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 160                         $thr_parent = Item::selectFirst($fields, $condition);
 161
 162                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 163
 164                         // This is IMPORTANT!!!!
 165
 166                         // We will only send a "notify owner to relay" or followup message if the referenced post
 167                         // originated on our system by virtue of having our hostname somewhere
 168                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 169
 170                         // if $parent['wall'] == 1 we will already have the parent message in our array
 171                         // and we will relay the whole lot.
 172
 173                         $localhost = str_replace('www.','',$a->getHostName());
 174                         if (strpos($localhost,':')) {
 175                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 176                         }
 177                         /**
 178                          *
 179                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 180                          * have been known to cause runaway conditions which affected several servers, along with
 181                          * permissions issues.
 182                          *
 183                          */
 184
 185                         $relay_to_owner = false;
 186
 187                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 188                                 $relay_to_owner = true;
 189                         }
 190
 191
 192                         if (($cmd === 'uplink') && (intval($parent['forum_mode']) == 1) && !$top_level) {
 193                                 $relay_to_owner = true;
 194                         }
 195
 196                         // until the 'origin' flag has been in use for several months
 197                         // we will just use it as a fallback test
 198                         // later we will be able to use it as the primary test of whether or not to relay.
 199
 200                         if (!$target_item['origin']) {
 201                                 $relay_to_owner = false;
 202                         }
 203                         if ($parent['origin']) {
 204                                 $relay_to_owner = false;
 205                         }
 206
 207                         // Special treatment for forum posts
 208                         if (self::isForumPost($target_item, $owner)) {
 209                                 $relay_to_owner = true;
 210                                 $direct_forum_delivery = true;
 211                         }
 212
 213                         // Avoid that comments in a forum thread are sent to OStatus
 214                         if (self::isForumPost($parent, $owner)) {
 215                                 $direct_forum_delivery = true;
 216                         }
 217
 218                         if ($relay_to_owner) {
 219                                 // local followup to remote post
 220                                 $followup = true;
 221                                 $public_message = false; // not public
 222                                 $recipients = [$parent['contact-id']];
 223                                 $recipients_followup  = [$parent['contact-id']];
 224
 225                                 Logger::log('Followup ' . $target_item['guid'] . ' to ' . $parent['contact-id'], Logger::DEBUG);
 226
 227                                 //if (!$target_item['private'] && $target_item['wall'] &&
 228                                 if (!$target_item['private'] &&
 229                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 230                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 231                                         $push_notify = true;
 232
 233                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 234                                         $push_notify = true;
 235
 236                                         if ($parent["network"] == Protocol::OSTATUS) {
 237                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 238                                                 // Currently it is work at progress
 239                                                 $condition = ['uid' => $uid, 'network' => Protocol::DFRN, 'blocked' => false, 'pending' => false, 'archive' => false];
 240                                                 $followup_contacts_stmt = DBA::select('contact', ['id'], $condition);
 241                                                 while($followup_contact = DBA::fetch($followup_contacts_stmt)) {
 242                                                         $recipients_followup[] = $followup_contact['id'];
 243                                                 }
 244                                                 DBA::close($followup_contacts_stmt);
 245                                         }
 246                                 }
 247
 248                                 if ($direct_forum_delivery) {
 249                                         $push_notify = false;
 250                                 }
 251
 252                                 Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
 253                         } else {
 254                                 $followup = false;
 255
 256                                 Logger::log('Distributing directly ' . $target_item["guid"], Logger::DEBUG);
 257
 258                                 // don't send deletions onward for other people's stuff
 259
 260                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 261                                         Logger::log('Ignoring delete notification for non-wall item');
 262                                         return;
 263                                 }
 264
 265                                 if (strlen($parent['allow_cid'])
 266                                         || strlen($parent['allow_gid'])
 267                                         || strlen($parent['deny_cid'])
 268                                         || strlen($parent['deny_gid'])) {
 269                                         $public_message = false; // private recipients, not public
 270                                 }
 271
 272                                 $allow_people = expand_acl($parent['allow_cid']);
 273                                 $allow_groups = Group::expand(expand_acl($parent['allow_gid']),true);
 274                                 $deny_people  = expand_acl($parent['deny_cid']);
 275                                 $deny_groups  = Group::expand(expand_acl($parent['deny_gid']));
 276
 277                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 278                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 279
 280                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== 'uplink')) {
 281                                         Worker::add($a->queue['priority'], 'Notifier', 'uplink', $target_id);
 282                                 }
 283
 284                                 foreach ($items as $item) {
 285                                         $recipients[] = $item['contact-id'];
 286                                         // pull out additional tagged people to notify (if public message)
 287                                         if ($public_message && strlen($item['inform'])) {
 288                                                 $people = explode(',',$item['inform']);
 289                                                 foreach ($people as $person) {
 290                                                         if (substr($person,0,4) === 'cid:') {
 291                                                                 $recipients[] = intval(substr($person,4));
 292                                                         } else {
 293                                                                 $url_recipients[] = substr($person,4);
 294                                                         }
 295                                                 }
 296                                         }
 297                                 }
 298
 299                                 if (count($url_recipients)) {
 300                                         Logger::log('Deliver ' . $target_item["guid"] . ' to _recipients ' . json_encode($url_recipients));
 301                                 }
 302
 303                                 $recipients = array_unique(array_merge($recipients, $allow_people, $allow_groups));
 304                                 $deny = array_unique(array_merge($deny_people, $deny_groups));
 305                                 $recipients = array_diff($recipients, $deny);
 306
 307                                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 308                                 if (
 309                                         function_exists('imap_open')
 310                                         && !Config::get('system','imap_disabled')
 311                                         && $public_message
 312                                         && intval($target_item['pubmail'])
 313                                 ) {
 314                                         $mail_contacts_stmt = DBA::select('contact', ['id'], ['uid' => $uid, 'network' => Protocol::MAIL]);
 315                                         while ($mail_contact = DBA::fetch($mail_contacts_stmt)) {
 316                                                 $recipients[] = $mail_contact['id'];
 317                                         }
 318                                         DBA::close($mail_contacts_stmt);
 319                                 }
 320                         }
 321
 322                         // If the thread parent is OStatus then do some magic to distribute the messages.
 323                         // We have not only to look at the parent, since it could be a Friendica thread.
 324                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 325                                 $diaspora_delivery = false;
 326
 327                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 328
 329                                 // Send a salmon to the parent author
 330                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 331                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 332                                         Logger::log('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 333                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 334                                 }
 335
 336                                 // Send a salmon to the parent owner
 337                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 338                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 339                                         Logger::log('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 340                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 341                                 }
 342
 343                                 // Send a salmon notification to every person we mentioned in the post
 344                                 $arr = explode(',',$target_item['tag']);
 345                                 foreach ($arr as $x) {
 346                                         //Logger::log('Checking tag '.$x, Logger::DEBUG);
 347                                         $matches = null;
 348                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 349                                                         $probed_contact = Probe::uri($matches[1]);
 350                                                 if ($probed_contact["notify"] != "") {
 351                                                         Logger::log('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 352                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 353                                                 }
 354                                         }
 355                                 }
 356
 357                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 358                                 $networks = [Protocol::OSTATUS, Protocol::DFRN];
 359                         } else {
 360                                 $networks = [Protocol::OSTATUS, Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 361                         }
 362                 } else {
 363                         $public_message = false;
 364                 }
 365
 366                 if (empty($delivery_contacts_stmt)) {
 367                         if ($followup) {
 368                                 $recipients = $recipients_followup;
 369                         }
 370                         $condition = ['id' => $recipients, 'self' => false,
 371                                 'blocked' => false, 'pending' => false, 'archive' => false];
 372                         if (!empty($networks)) {
 373                                 $condition['network'] = $networks;
 374                         }
 375                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'network', 'batch'], $condition);
 376                 }
 377
 378                 $conversants = [];
 379                 $batch_delivery = false;
 380
 381                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 382                         $relay_list = [];
 383
 384                         if ($diaspora_delivery) {
 385                                 $batch_delivery = true;
 386
 387                                 $relay_list_stmt = DBA::p(
 388                                         "SELECT
 389                                         `batch`,
 390                                         ANY_VALUE(`id`) AS `id`,
 391                                         ANY_VALUE(`name`) AS `name`,
 392                                         ANY_VALUE(`network`) AS `network`
 393                                         FROM `contact`
 394                                         WHERE `network` = ?
 395                                         AND `batch` != ''
 396                                         AND `uid` = ?
 397                                         AND `rel` != ?
 398                                         AND NOT `blocked`
 399                                         AND NOT `pending`
 400                                         AND NOT `archive`
 401                                         GROUP BY `batch`",
 402                                         Protocol::DIASPORA,
 403                                         $owner['uid'],
 404                                         Contact::SHARING
 405                                 );
 406                                 $relay_list = DBA::toArray($relay_list_stmt);
 407
 408                                 // Fetch the participation list
 409                                 // The function will ensure that there are no duplicates
 410                                 $relay_list = Diaspora::participantsForThread($target_id, $relay_list);
 411
 412                                 // Add the relay to the list, avoid duplicates.
 413                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 414                                 if (!$followup && !self::isForumPost($target_item, $owner)) {
 415                                         $relay_list = Diaspora::relayList($target_id, $relay_list);
 416                                 }
 417                         }
 418
 419                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 420                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 421
 422                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'url', 'name', 'network'], $condition));
 423
 424                         $r = array_merge($r2, $relay_list);
 425
 426                         if (DBA::isResult($r)) {
 427                                 foreach ($r as $rr) {
 428                                         if (Config::get('debug', 'total_ap_delivery') && !empty($rr['url']) && ($rr['network'] == Protocol::DFRN) && !empty(APContact::getByURL($rr['url'], false))) {
 429                                                 Logger::log('Skipping contact ' . $rr['url'] . ' since it will be delivered via AP', Logger::DEBUG);
 430                                                 continue;
 431                                         }
 432
 433                                         $conversants[] = $rr['id'];
 434
 435                                         $delivery_queue_count++;
 436
 437                                         Logger::log('Public delivery of item ' . $target_item["guid"] . ' (' . $target_id . ') to ' . json_encode($rr), Logger::DEBUG);
 438
 439                                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 440                                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 441                                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 442                                         if ($rr['network'] == Protocol::DIASPORA) {
 443                                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 444                                         } else {
 445                                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 446                                         }
 447                                         Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$rr['id']);
 448                                 }
 449                         }
 450
 451                         $push_notify = true;
 452                 }
 453
 454                 // delivery loop
 455                 while ($contact = DBA::fetch($delivery_contacts_stmt)) {
 456                         if (Config::get('debug', 'total_ap_delivery') && ($contact['network'] == Protocol::DFRN) && !empty(APContact::getByURL($contact['url'], false))) {
 457                                 Logger::log('Skipping contact ' . $contact['url'] . ' since it will be delivered via AP', Logger::DEBUG);
 458                                 continue;
 459                         }
 460
 461                         // Don't deliver to Diaspora if it already had been done as batch delivery
 462                         if (($contact['network'] == Protocol::DIASPORA) && $batch_delivery) {
 463                                 Logger::log('Already delivered  id ' . $target_id . ' via batch to ' . json_encode($contact), Logger::DEBUG);
 464                                 continue;
 465                         }
 466
 467                         // Don't deliver to folks who have already been delivered to
 468                         if (in_array($contact['id'], $conversants)) {
 469                                 Logger::log('Already delivered id ' . $target_id. ' to ' . json_encode($contact), Logger::DEBUG);
 470                                 continue;
 471                         }
 472
 473                         $delivery_queue_count++;
 474
 475                         Logger::log('Delivery of item ' . $target_id . ' to ' . json_encode($contact), Logger::DEBUG);
 476
 477                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 478                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 479                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 480                         if ($contact['network'] == Protocol::DIASPORA) {
 481                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 482                         } else {
 483                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 484                         }
 485                         Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$contact['id']);
 486                 }
 487                 DBA::close($delivery_contacts_stmt);
 488
 489
 490                 $url_recipients = array_filter($url_recipients);
 491                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 492                 // They are especially used for notifications to OStatus users that don't follow us.
 493                 if (!Config::get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && !empty($target_item)) {
 494                         $delivery_queue_count += count($url_recipients);
 495                         $slap = OStatus::salmon($target_item, $owner);
 496                         foreach ($url_recipients as $url) {
 497                                 Logger::log('Salmon delivery of item ' . $target_id . ' to ' . $url);
 498                                 /// @TODO Redeliver/queue these items on failure, though there is no contact record
 499                                 Salmon::slapper($owner, $url, $slap);
 500                                 ItemDeliveryData::incrementQueueDone($target_id);
 501                         }
 502                 }
 503
 504                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 505                 if ($push_notify) {
 506                         Logger::log('Activating internal PuSH for item '.$target_id, Logger::DEBUG);
 507
 508                         // Handling the pubsubhubbub requests
 509                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 510                 }
 511
 512                 if (!empty($target_item)) {
 513                         Logger::log('Calling hooks for ' . $cmd . ' ' . $target_id, Logger::DEBUG);
 514
 515                         if (in_array($cmd, [Delivery::POST, Delivery::COMMENT])) {
 516                                 ItemDeliveryData::update($target_item['id'], ['queue_count' => $delivery_queue_count]);
 517                         }
 518
 519                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 520
 521                         Hook::callAll('notifier_end', $target_item);
 522                 }
 523
 524                 return;
 525         }
 526
 527         /**
 528          * @param int    $self_user_id
 529          * @param int    $priority The priority the Notifier queue item was created with
 530          * @param string $created  The date the Notifier queue item was created on
 531          * @return bool
 532          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 533          * @throws \ImagickException
 534          */
 535         private static function notifySelfRemoval($self_user_id, $priority, $created)
 536         {
 537                 $owner = User::getOwnerDataById($self_user_id);
 538                 if (!$owner) {
 539                         return false;
 540                 }
 541
 542                 $contacts_stmt = DBA::select('contact', [], ['self' => false, 'uid' => $self_user_id]);
 543                 if (!DBA::isResult($contacts_stmt)) {
 544                         return false;
 545                 }
 546
 547                 while($contact = DBA::fetch($contacts_stmt)) {
 548                         Contact::terminateFriendship($owner, $contact, true);
 549                 }
 550                 DBA::close($contacts_stmt);
 551
 552                 $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 553                 foreach ($inboxes as $inbox) {
 554                         Logger::log('Account removal for user ' . $self_user_id . ' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 555                         Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $created, 'dont_fork' => true],
 556                                 'APDelivery', Delivery::REMOVAL, '', $inbox, $self_user_id);
 557                 }
 558
 559                 return true;
 560         }
 561
 562         /**
 563          * @param string $cmd
 564          * @param array  $target_item
 565          * @param array  $parent
 566          * @param int    $priority The priority the Notifier queue item was created with
 567          * @param string $created  The date the Notifier queue item was created on
 568          * @return int The number of delivery tasks created
 569          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 570          * @throws \ImagickException
 571          */
 572         private static function activityPubDelivery($cmd, array $target_item, array $parent, $priority, $created)
 573         {
 574                 $inboxes = [];
 575
 576                 $uid = $target_item['contact-uid'] ?: $target_item['uid'];
 577
 578                 if ($target_item['origin']) {
 579                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 580                         Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 581                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 582                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 583                         return 0;
 584                 } elseif ($parent['origin']) {
 585                         // Remote items are transmitted via the personal inboxes.
 586                         // Doing so ensures that the dedicated receiver will get the message.
 587                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, true, $target_item['id']);
 588                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 589                 }
 590
 591                 if (empty($inboxes)) {
 592                         Logger::log('No inboxes found for item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 593                         return 0;
 594                 }
 595
 596                 // Fill the item cache
 597                 ActivityPub\Transmitter::createCachedActivityFromItem($target_item['id'], true);
 598
 599                 foreach ($inboxes as $inbox) {
 600                         Logger::log('Deliver ' . $target_item['id'] .' to ' . $inbox .' via ActivityPub', Logger::DEBUG);
 601
 602                         Worker::add(['priority' => $priority, 'created' => $created, 'dont_fork' => true],
 603                                         'APDelivery', $cmd, $target_item['id'], $inbox, $uid);
 604                 }
 605
 606                 return count($inboxes);
 607         }
 608
 609         private static function isForumPost(array $item, array $owner)
 610         {
 611                 if (($item['author-id'] == $item['owner-id']) ||
 612                         ($owner['id'] == $item['contact-id']) ||
 613                         ($item['uri'] != $item['parent-uri'])) {
 614                         return false;
 615                 }
 616
 617                 return self::isForum($item['contact-id']);
 618         }
 619
 620         private static function isForum($contactid)
 621         {
 622                 $fields = ['forum', 'prv'];
 623                 $condition = ['id' => $contactid];
 624                 $contact = DBA::selectFirst('contact', $fields, $condition);
 625                 if (!DBA::isResult($contact)) {
 626                         // Should never happen
 627                         return false;
 628                 }
 629
 630                 // Is it a forum?
 631                 return ($contact['forum'] || $contact['prv']);
 632         }
 633 }