src/Worker/Notifier.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Worker;
  23
  24 use Friendica\Core\Hook;
  25 use Friendica\Core\Logger;
  26 use Friendica\Core\Protocol;
  27 use Friendica\Core\Worker;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Model\Contact;
  31 use Friendica\Model\Conversation;
  32 use Friendica\Model\Group;
  33 use Friendica\Model\Item;
  34 use Friendica\Model\Post;
  35 use Friendica\Model\PushSubscriber;
  36 use Friendica\Model\Tag;
  37 use Friendica\Model\User;
  38 use Friendica\Protocol\Activity;
  39 use Friendica\Protocol\ActivityPub;
  40 use Friendica\Protocol\Diaspora;
  41 use Friendica\Protocol\OStatus;
  42 use Friendica\Protocol\Relay;
  43 use Friendica\Protocol\Salmon;
  44
  45 /*
  46  * The notifier is typically called with:
  47  *
  48  *              Worker::add(PRIORITY_HIGH, "Notifier", COMMAND, ITEM_ID);
  49  *
  50  * where COMMAND is one of the constants that are defined in Worker/Delivery.php
  51  * and ITEM_ID is the id of the item in the database that needs to be sent to others.
  52  */
  53
  54 class Notifier
  55 {
  56         public static function execute(string $cmd, int $post_uriid, int $sender_uid = 0)
  57         {
  58                 $a = DI::app();
  59
  60                 Logger::info('Invoked', ['cmd' => $cmd, 'target' => $post_uriid, 'sender_uid' => $sender_uid]);
  61
  62                 if (!empty($sender_uid)) {
  63                         $post = Post::selectFirst(['id'], ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  64                         if (!DBA::isResult($post)) {
  65                                 Logger::warning('Post not found', ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  66                                 return;
  67                         }
  68                         $target_id = $post['id'];
  69                 } else {
  70                         $target_id = $post_uriid;
  71                 }
  72
  73                 $top_level = false;
  74                 $recipients = [];
  75                 $url_recipients = [];
  76
  77                 $delivery_contacts_stmt = null;
  78                 $target_item = [];
  79                 $parent = [];
  80                 $thr_parent = [];
  81                 $items = [];
  82                 $delivery_queue_count = 0;
  83                 $ap_contacts = [];
  84
  85                 if ($cmd == Delivery::MAIL) {
  86                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $target_id]);
  87                         if (!DBA::isResult($message)) {
  88                                 return;
  89                         }
  90                         $uid = $message['uid'];
  91                         $recipients[] = $message['contact-id'];
  92
  93                         $mail = ActivityPub\Transmitter::ItemArrayFromMail($target_id);
  94                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($mail, $uid, true);
  95                         foreach ($inboxes as $inbox => $receivers) {
  96                                 $ap_contacts = array_merge($ap_contacts, $receivers);
  97                                 Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'target' => $target_id, 'inbox' => $inbox]);
  98                                 Worker::add(['priority' => PRIORITY_HIGH, 'created' => $a->queue['created'], 'dont_fork' => true],
  99                                         'APDelivery', $cmd, $target_id, $inbox, $uid, $receivers, $post_uriid);
 100                         }
 101                 } elseif ($cmd == Delivery::SUGGESTION) {
 102                         $suggest = DI::fsuggest()->getById($target_id);
 103                         $uid = $suggest->uid;
 104                         $recipients[] = $suggest->cid;
 105                 } elseif ($cmd == Delivery::REMOVAL) {
 106                         return self::notifySelfRemoval($target_id, $a->queue['priority'], $a->queue['created']);
 107                 } elseif ($cmd == Delivery::RELOCATION) {
 108                         $uid = $target_id;
 109
 110                         $condition = ['uid' => $target_id, 'self' => false, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
 111                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'addr', 'network', 'protocol', 'batch'], $condition);
 112                 } else {
 113                         // find ancestors
 114                         $condition = ['id' => $target_id, 'visible' => true];
 115                         $target_item = Post::selectFirst(Item::DELIVER_FIELDLIST, $condition);
 116
 117                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
 118                                 Logger::info('No target item', ['cmd' => $cmd, 'target' => $target_id]);
 119                                 return;
 120                         }
 121
 122                         if (!empty($target_item['contact-uid'])) {
 123                                 $uid = $target_item['contact-uid'];
 124                         } elseif (!empty($target_item['uid'])) {
 125                                 $uid = $target_item['uid'];
 126                         } else {
 127                                 Logger::info('Only public users, quitting', ['target' => $target_id]);
 128                                 return;
 129                         }
 130
 131                         $condition = ['parent' => $target_item['parent'], 'visible' => true];
 132                         $params = ['order' => ['id']];
 133                         $items_stmt = Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
 134                         if (!DBA::isResult($items_stmt)) {
 135                                 Logger::info('No item found', ['cmd' => $cmd, 'target' => $target_id]);
 136                                 return;
 137                         }
 138
 139                         $items = Post::toArray($items_stmt);
 140
 141                         // avoid race condition with deleting entries
 142                         if ($items[0]['deleted']) {
 143                                 foreach ($items as $item) {
 144                                         $item['deleted'] = 1;
 145                                 }
 146                         }
 147
 148                         $top_level = $target_item['gravity'] == GRAVITY_PARENT;
 149                 }
 150
 151                 $owner = User::getOwnerDataById($uid);
 152                 if (!$owner) {
 153                         Logger::info('Owner not found', ['cmd' => $cmd, 'target' => $target_id]);
 154                         return;
 155                 }
 156
 157                 // Should the post be transmitted to Diaspora?
 158                 $diaspora_delivery = true;
 159
 160                 // If this is a public conversation, notify the feed hub
 161                 $public_message = true;
 162
 163                 $unlisted = false;
 164
 165                 // Do a PuSH
 166                 $push_notify = false;
 167
 168                 // Deliver directly to a forum, don't PuSH
 169                 $direct_forum_delivery = false;
 170
 171                 $followup = false;
 172                 $recipients_followup = [];
 173
 174                 if (!empty($target_item) && !empty($items)) {
 175                         $parent = $items[0];
 176
 177                         $fields = ['network', 'author-id', 'author-link', 'author-network', 'owner-id'];
 178                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 179                         $thr_parent = Post::selectFirst($fields, $condition);
 180                         if (empty($thr_parent)) {
 181                                 $thr_parent = $parent;
 182                         }
 183
 184                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 185
 186                         if (!self::isRemovalActivity($cmd, $owner, Protocol::ACTIVITYPUB)) {
 187                                 $apdelivery = self::activityPubDelivery($cmd, $target_item, $parent, $thr_parent, $a->queue['priority'], $a->queue['created'], $owner);
 188                                 $ap_contacts = $apdelivery['contacts'];
 189                                 $delivery_queue_count += $apdelivery['count'];
 190                         }
 191
 192                         // Only deliver threaded replies (comment to a comment) to Diaspora
 193                         // when the original comment author does support the Diaspora protocol.
 194                         if ($thr_parent['author-link'] && $target_item['parent-uri'] != $target_item['thr-parent']) {
 195                                 $diaspora_delivery = Diaspora::isSupportedByContactUrl($thr_parent['author-link']);
 196                                 Logger::info('Threaded comment', ['diaspora_delivery' => (int)$diaspora_delivery]);
 197                         }
 198
 199                         $unlisted = $target_item['private'] == Item::UNLISTED;
 200
 201                         // This is IMPORTANT!!!!
 202
 203                         // We will only send a "notify owner to relay" or followup message if the referenced post
 204                         // originated on our system by virtue of having our hostname somewhere
 205                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 206
 207                         // if $parent['wall'] == 1 we will already have the parent message in our array
 208                         // and we will relay the whole lot.
 209
 210                         $localhost = str_replace('www.','', DI::baseUrl()->getHostname());
 211                         if (strpos($localhost,':')) {
 212                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 213                         }
 214                         /**
 215                          *
 216                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 217                          * have been known to cause runaway conditions which affected several servers, along with
 218                          * permissions issues.
 219                          *
 220                          */
 221
 222                         $relay_to_owner = false;
 223
 224                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 225                                 $relay_to_owner = true;
 226                         }
 227
 228                         if (($cmd === Delivery::UPLINK) && (intval($parent['forum_mode']) == 1) && !$top_level) {
 229                                 $relay_to_owner = true;
 230                         }
 231
 232                         // until the 'origin' flag has been in use for several months
 233                         // we will just use it as a fallback test
 234                         // later we will be able to use it as the primary test of whether or not to relay.
 235
 236                         if (!$target_item['origin']) {
 237                                 $relay_to_owner = false;
 238                         }
 239                         if ($parent['origin']) {
 240                                 $relay_to_owner = false;
 241                         }
 242
 243                         // Special treatment for forum posts
 244                         if (Item::isForumPost($target_item, $owner)) {
 245                                 $relay_to_owner = true;
 246                                 $direct_forum_delivery = true;
 247                         }
 248
 249                         // Avoid that comments in a forum thread are sent to OStatus
 250                         if (Item::isForumPost($parent, $owner)) {
 251                                 $direct_forum_delivery = true;
 252                         }
 253
 254                         if ($relay_to_owner) {
 255                                 // local followup to remote post
 256                                 $followup = true;
 257                                 $public_message = false; // not public
 258                                 $recipients = [$parent['contact-id']];
 259                                 $recipients_followup  = [$parent['contact-id']];
 260
 261                                 Logger::info('Followup', ['target' => $target_id, 'guid' => $target_item['guid'], 'to' => $parent['contact-id']]);
 262
 263                                 if (($target_item['private'] != Item::PRIVATE) &&
 264                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 265                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 266                                         $push_notify = true;
 267
 268                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 269                                         $push_notify = true;
 270
 271                                         if ($parent["network"] == Protocol::OSTATUS) {
 272                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 273                                                 // Currently it is work at progress
 274                                                 $condition = ['uid' => $uid, 'network' => Protocol::DFRN, 'blocked' => false, 'pending' => false, 'archive' => false];
 275                                                 $followup_contacts_stmt = DBA::select('contact', ['id'], $condition);
 276                                                 while($followup_contact = DBA::fetch($followup_contacts_stmt)) {
 277                                                         $recipients_followup[] = $followup_contact['id'];
 278                                                 }
 279                                                 DBA::close($followup_contacts_stmt);
 280                                         }
 281                                 }
 282
 283                                 if ($direct_forum_delivery) {
 284                                         $push_notify = false;
 285                                 }
 286
 287                                 Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
 288                         } else {
 289                                 $followup = false;
 290
 291                                 Logger::info('Distributing directly', ['target' => $target_id, 'guid' => $target_item['guid']]);
 292
 293                                 // don't send deletions onward for other people's stuff
 294
 295                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 296                                         Logger::log('Ignoring delete notification for non-wall item');
 297                                         return;
 298                                 }
 299
 300                                 if (strlen($parent['allow_cid'])
 301                                         || strlen($parent['allow_gid'])
 302                                         || strlen($parent['deny_cid'])
 303                                         || strlen($parent['deny_gid'])) {
 304                                         $public_message = false; // private recipients, not public
 305                                 }
 306
 307                                 $aclFormatter = DI::aclFormatter();
 308
 309                                 $allow_people = $aclFormatter->expand($parent['allow_cid']);
 310                                 $allow_groups = Group::expand($uid, $aclFormatter->expand($parent['allow_gid']),true);
 311                                 $deny_people  = $aclFormatter->expand($parent['deny_cid']);
 312                                 $deny_groups  = Group::expand($uid, $aclFormatter->expand($parent['deny_gid']));
 313
 314                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 315                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 316                                 /// @todo Possibly we should not uplink when the author is the forum itself?
 317
 318                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== Delivery::UPLINK)
 319                                         && ($target_item['verb'] != Activity::ANNOUNCE)) {
 320                                         Worker::add($a->queue['priority'], 'Notifier', Delivery::UPLINK, $post_uriid, $sender_uid);
 321                                 }
 322
 323                                 foreach ($items as $item) {
 324                                         $recipients[] = $item['contact-id'];
 325                                         // pull out additional tagged people to notify (if public message)
 326                                         if ($public_message && strlen($item['inform'])) {
 327                                                 $people = explode(',',$item['inform']);
 328                                                 foreach ($people as $person) {
 329                                                         if (substr($person,0,4) === 'cid:') {
 330                                                                 $recipients[] = intval(substr($person,4));
 331                                                         } else {
 332                                                                 $url_recipients[] = substr($person,4);
 333                                                         }
 334                                                 }
 335                                         }
 336                                 }
 337
 338                                 if (count($url_recipients)) {
 339                                         Logger::notice('Deliver', ['target' => $target_id, 'guid' => $target_item['guid'], 'recipients' => $url_recipients]);
 340                                 }
 341
 342                                 $recipients = array_unique(array_merge($recipients, $allow_people, $allow_groups));
 343                                 $deny = array_unique(array_merge($deny_people, $deny_groups));
 344                                 $recipients = array_diff($recipients, $deny);
 345
 346                                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 347                                 if (
 348                                         function_exists('imap_open')
 349                                         && !DI::config()->get('system','imap_disabled')
 350                                         && $public_message
 351                                         && intval($target_item['pubmail'])
 352                                 ) {
 353                                         $mail_contacts_stmt = DBA::select('contact', ['id'], ['uid' => $uid, 'network' => Protocol::MAIL]);
 354                                         while ($mail_contact = DBA::fetch($mail_contacts_stmt)) {
 355                                                 $recipients[] = $mail_contact['id'];
 356                                         }
 357                                         DBA::close($mail_contacts_stmt);
 358                                 }
 359                         }
 360
 361                         // If the thread parent is OStatus then do some magic to distribute the messages.
 362                         // We have not only to look at the parent, since it could be a Friendica thread.
 363                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 364                                 $diaspora_delivery = false;
 365
 366                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 367
 368                                 // Send a salmon to the parent author
 369                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 370                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 371                                         Logger::notice('Notify parent author', ['url' => $probed_contact["url"], 'notify' => $probed_contact["notify"]]);
 372                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 373                                 }
 374
 375                                 // Send a salmon to the parent owner
 376                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 377                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 378                                         Logger::notice('Notify parent owner', ['url' => $probed_contact["url"], 'notify' => $probed_contact["notify"]]);
 379                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 380                                 }
 381
 382                                 // Send a salmon notification to every person we mentioned in the post
 383                                 foreach (Tag::getByURIId($target_item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION, Tag::IMPLICIT_MENTION]) as $tag) {
 384                                         $probed_contact = Contact::getByURL($tag['url']);
 385                                         if (!empty($probed_contact['notify'])) {
 386                                                 Logger::notice('Notify mentioned user', ['url' => $probed_contact["url"], 'notify' => $probed_contact["notify"]]);
 387                                                 $url_recipients[$probed_contact['notify']] = $probed_contact['notify'];
 388                                         }
 389                                 }
 390
 391                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 392                                 $networks = [Protocol::DFRN];
 393                         } elseif ($diaspora_delivery) {
 394                                 $networks = [Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 395                                 if (($parent['network'] == Protocol::DIASPORA) || ($thr_parent['network'] == Protocol::DIASPORA)) {
 396                                         Logger::info('Add AP contacts', ['target' => $target_id, 'guid' => $target_item['guid']]);
 397                                         $networks[] = Protocol::ACTIVITYPUB;
 398                                 }
 399                         } else {
 400                                 $networks = [Protocol::DFRN, Protocol::MAIL];
 401                         }
 402                 } else {
 403                         $public_message = false;
 404                 }
 405
 406                 if (empty($delivery_contacts_stmt)) {
 407                         if ($followup) {
 408                                 $recipients = $recipients_followup;
 409                         }
 410                         $condition = ['id' => $recipients, 'self' => false, 'uid' => [0, $uid],
 411                                 'blocked' => false, 'pending' => false, 'archive' => false];
 412                         if (!empty($networks)) {
 413                                 $condition['network'] = $networks;
 414                         }
 415                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'addr', 'url', 'network', 'protocol', 'batch'], $condition);
 416                 }
 417
 418                 $conversants = [];
 419                 $batch_delivery = false;
 420
 421                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 422                         $relay_list = [];
 423
 424                         if ($diaspora_delivery && !$unlisted) {
 425                                 $batch_delivery = true;
 426
 427                                 $relay_list_stmt = DBA::p(
 428                                         "SELECT
 429                                                 `batch`, `network`, `protocol`,
 430                                                 ANY_VALUE(`id`) AS `id`,
 431                                                 ANY_VALUE(`url`) AS `url`,
 432                                                 ANY_VALUE(`name`) AS `name`
 433                                         FROM `contact`
 434                                         WHERE `network` = ?
 435                                         AND `batch` != ''
 436                                         AND `uid` = ?
 437                                         AND `rel` != ?
 438                                         AND NOT `blocked`
 439                                         AND NOT `pending`
 440                                         AND NOT `archive`
 441                                         GROUP BY `batch`, `network`, `protocol`",
 442                                         Protocol::DIASPORA,
 443                                         $owner['uid'],
 444                                         Contact::SHARING
 445                                 );
 446                                 $relay_list = DBA::toArray($relay_list_stmt);
 447
 448                                 // Fetch the participation list
 449                                 // The function will ensure that there are no duplicates
 450                                 $relay_list = Diaspora::participantsForThread($target_item, $relay_list);
 451
 452                                 // Add the relay to the list, avoid duplicates.
 453                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 454                                 if (!$followup && !Item::isForumPost($target_item, $owner) && !self::isForumPost($target_item)) {
 455                                         $relay_list = Relay::getList($target_id, $relay_list, [Protocol::DFRN, Protocol::DIASPORA]);
 456                                 }
 457                         }
 458
 459                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 460                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 461
 462                         $contacts = DBA::toArray(DBA::select('contact', ['id', 'url', 'addr', 'name', 'network', 'protocol'], $condition));
 463
 464                         $conversants = array_merge($contacts, $relay_list);
 465
 466                         $delivery_queue_count += self::delivery($cmd, $post_uriid, $sender_uid, $target_item, $thr_parent, $owner, $batch_delivery, true, $conversants, $ap_contacts, []);
 467
 468                         $push_notify = true;
 469                 }
 470
 471                 $contacts = DBA::toArray($delivery_contacts_stmt);
 472                 $delivery_queue_count += self::delivery($cmd, $post_uriid, $sender_uid, $target_item, $thr_parent, $owner, $batch_delivery, false, $contacts, $ap_contacts, $conversants);
 473
 474                 $delivery_queue_count += self::deliverOStatus($target_id, $target_item, $owner, $url_recipients, $public_message, $push_notify);
 475
 476                 if (!empty($target_item)) {
 477                         Logger::log('Calling hooks for ' . $cmd . ' ' . $target_id, Logger::DEBUG);
 478
 479                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 480
 481                         Hook::callAll('notifier_end', $target_item);
 482
 483                         // Workaround for pure connector posts
 484                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 485                                 if ($delivery_queue_count == 0) {
 486                                         Post\DeliveryData::incrementQueueDone($target_item['uri-id']);
 487                                         $delivery_queue_count = 1;
 488                                 }
 489
 490                                 Post\DeliveryData::incrementQueueCount($target_item['uri-id'], $delivery_queue_count);
 491                         }
 492                 }
 493
 494                 return;
 495         }
 496
 497         /**
 498          * Deliver the message to the contacts
 499          *
 500          * @param string $cmd
 501          * @param int $post_uriid
 502          * @param int $sender_uid
 503          * @param array $target_item
 504          * @param array $thr_parent
 505          * @param array $owner
 506          * @param bool $batch_delivery
 507          * @param array $contacts
 508          * @param array $ap_contacts
 509          * @param array $conversants
 510          * @return int
 511          * @throws InternalServerErrorException
 512          * @throws Exception
 513          */
 514         private static function delivery(string $cmd, int $post_uriid, int $sender_uid, array $target_item, array $thr_parent, array $owner, bool $batch_delivery, bool $in_batch, array $contacts, array $ap_contacts, array $conversants = [])
 515         {
 516                 $a = DI::app();
 517                 $delivery_queue_count = 0;
 518
 519                 foreach ($contacts as $contact) {
 520                         // Ensure that local contacts are delivered via DFRN
 521                         if (Contact::isLocal($contact['url'])) {
 522                                 $contact['network'] = Protocol::DFRN;
 523                         }
 524
 525                         if (in_array($contact['id'], $ap_contacts)) {
 526                                 Logger::info('Contact is already delivered via AP, so skip delivery via legacy DFRN/Diaspora', ['target' => $post_uriid, 'uid' => $sender_uid, 'contact' => $contact['url']]);
 527                                 continue;
 528                         }
 529
 530                         if (!empty($contact['id']) && Contact::isArchived($contact['id'])) {
 531                                 Logger::info('Contact is archived, so skip delivery', ['target' => $post_uriid, 'uid' => $sender_uid, 'contact' => $contact['url']]);
 532                                 continue;
 533                         }
 534
 535                         if (self::isRemovalActivity($cmd, $owner, $contact['network'])) {
 536                                 Logger::info('Contact does no supports account removal commands, so skip delivery', ['target' => $post_uriid, 'uid' => $sender_uid, 'contact' => $contact['url']]);
 537                                 continue;
 538                         }
 539
 540                         if (self::skipActivityPubForDiaspora($contact, $target_item, $thr_parent)) {
 541                                 Logger::info('Contact is from Diaspora, but the replied author is from ActivityPub, so skip delivery via Diaspora', ['id' => $post_uriid, 'uid' => $sender_uid, 'url' => $contact['url']]);
 542                                 continue;
 543                         }
 544
 545                         // Don't deliver to Diaspora if it already had been done as batch delivery
 546                         if (!$in_batch && $batch_delivery && ($contact['network'] == Protocol::DIASPORA)) {
 547                                 Logger::info('Diaspora contact is already delivered via batch', ['id' => $post_uriid, 'uid' => $sender_uid, 'contact' => $contact]);
 548                                 continue;
 549                         }
 550
 551                         // Don't deliver to folks who have already been delivered to
 552                         if (in_array($contact['id'], $conversants)) {
 553                                 Logger::info('Already delivery', ['id' => $post_uriid, 'uid' => $sender_uid, 'contact' => $contact]);
 554                                 continue;
 555                         }
 556
 557                         Logger::info('Delivery', ['batch' => $in_batch, 'target' => $post_uriid, 'uid' => $sender_uid, 'guid' => $target_item['guid'] ?? '', 'to' => $contact]);
 558
 559                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 560                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 561                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 562                         // This is only important for high and medium priority tasks and not for Low priority jobs like deletions.
 563                         if (($contact['network'] == Protocol::DIASPORA) && in_array($a->queue['priority'], [PRIORITY_HIGH, PRIORITY_MEDIUM])) {
 564                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 565                         } else {
 566                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 567                         }
 568
 569                         if (Worker::add($deliver_options, 'Delivery', $cmd, $post_uriid, (int)$contact['id'], $sender_uid)) {
 570                                 $delivery_queue_count++;
 571                         }
 572                 }
 573                 return $delivery_queue_count;
 574         }
 575
 576         /**
 577          * Deliver the message via OStatus
 578          *
 579          * @param int $target_id
 580          * @param array $target_item
 581          * @param array $owner
 582          * @param array $url_recipients
 583          * @param bool $public_message
 584          * @param bool $push_notify
 585          * @return int
 586          * @throws InternalServerErrorException
 587          * @throws Exception
 588          */
 589         private static function deliverOStatus(int $target_id, array $target_item, array $owner, array $url_recipients, bool $public_message, bool $push_notify)
 590         {
 591                 $a = DI::app();
 592                 $delivery_queue_count = 0;
 593
 594                 $url_recipients = array_filter($url_recipients);
 595                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 596                 // They are especially used for notifications to OStatus users that don't follow us.
 597                 if (!DI::config()->get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && !empty($target_item)) {
 598                         $slap = OStatus::salmon($target_item, $owner);
 599                         foreach ($url_recipients as $url) {
 600                                 Logger::info('Salmon delivery', ['item' => $target_id, 'to' => $url]);
 601
 602                                 $delivery_queue_count++;
 603                                 Salmon::slapper($owner, $url, $slap);
 604                                 Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Post\DeliveryData::OSTATUS);
 605                         }
 606                 }
 607
 608                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 609                 if ($push_notify) {
 610                         Logger::info('Activating internal PuSH', ['item' => $target_id]);
 611
 612                         // Handling the pubsubhubbub requests
 613                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 614                 }
 615                 return $delivery_queue_count;
 616         }
 617
 618         /**
 619          * Checks if the current delivery shouldn't be transported to Diaspora.
 620          * This is done for posts from AP authors or posts that are comments to AP authors.
 621          *
 622          * @param array  $contact    Receiver of the post
 623          * @param array  $item       The post
 624          * @param array  $thr_parent The thread parent
 625          * @return bool
 626          */
 627         private static function skipActivityPubForDiaspora(array $contact, array $item, array $thr_parent)
 628         {
 629                 // No skipping needs to be done when delivery isn't done to Diaspora
 630                 if ($contact['network'] != Protocol::DIASPORA) {
 631                         return false;
 632                 }
 633
 634                 // Skip the delivery to Diaspora if the item is from an ActivityPub author
 635                 if (!empty($item['author-network']) && ($item['author-network'] == Protocol::ACTIVITYPUB)) {
 636                         return true;
 637                 }
 638
 639                 // Skip the delivery to Diaspora if the thread parent is from an ActivityPub author
 640                 if (!empty($thr_parent['author-network']) && ($thr_parent['author-network'] == Protocol::ACTIVITYPUB)) {
 641                         return true;
 642                 }
 643
 644                 return false;
 645         }
 646
 647         /**
 648          * Checks if the current action is a deletion command of a account removal activity
 649          * For Diaspora and ActivityPub we don't need to send single item deletion calls.
 650          * These protocols do have a dedicated command for deleting a whole account.
 651          *
 652          * @param string $cmd     Notifier command
 653          * @param array  $owner   Sender of the post
 654          * @param string $network Receiver network
 655          * @return bool
 656          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 657          * @throws \ImagickException
 658          */
 659         private static function isRemovalActivity($cmd, $owner, $network)
 660         {
 661                 return ($cmd == Delivery::DELETION) && $owner['account_removed'] && in_array($network, [Protocol::ACTIVITYPUB, Protocol::DIASPORA]);
 662         }
 663
 664         /**
 665          * @param int    $self_user_id
 666          * @param int    $priority The priority the Notifier queue item was created with
 667          * @param string $created  The date the Notifier queue item was created on
 668          * @return bool
 669          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 670          * @throws \ImagickException
 671          */
 672         private static function notifySelfRemoval($self_user_id, $priority, $created)
 673         {
 674                 $owner = User::getOwnerDataById($self_user_id);
 675                 if (!$owner) {
 676                         return false;
 677                 }
 678
 679                 $contacts_stmt = DBA::select('contact', [], ['self' => false, 'uid' => $self_user_id]);
 680                 if (!DBA::isResult($contacts_stmt)) {
 681                         return false;
 682                 }
 683
 684                 while($contact = DBA::fetch($contacts_stmt)) {
 685                         Contact::terminateFriendship($owner, $contact, true);
 686                 }
 687                 DBA::close($contacts_stmt);
 688
 689                 $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 690                 foreach ($inboxes as $inbox => $receivers) {
 691                         Logger::info('Account removal via ActivityPub', ['uid' => $self_user_id, 'inbox' => $inbox]);
 692                         Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $created, 'dont_fork' => true],
 693                                 'APDelivery', Delivery::REMOVAL, 0, $inbox, $self_user_id, $receivers);
 694                 }
 695
 696                 return true;
 697         }
 698
 699         /**
 700          * @param string $cmd
 701          * @param array  $target_item
 702          * @param array  $parent
 703          * @param array  $thr_parent
 704          * @param int    $priority The priority the Notifier queue item was created with
 705          * @param string $created  The date the Notifier queue item was created on
 706          * @return array 'count' => The number of delivery tasks created, 'contacts' => their contact ids
 707          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 708          * @throws \ImagickException
 709          */
 710         private static function activityPubDelivery($cmd, array $target_item, array $parent, array $thr_parent, $priority, $created, $owner)
 711         {
 712                 // Don't deliver via AP when the starting post isn't from a federated network
 713                 if (!in_array($parent['network'], Protocol::FEDERATED)) {
 714                         return ['count' => 0, 'contacts' => []];
 715                 }
 716
 717                 // Don't deliver via AP when the starting post is delivered via Diaspora
 718                 if ($parent['network'] == Protocol::DIASPORA) {
 719                         return ['count' => 0, 'contacts' => []];
 720                 }
 721
 722                 // Also don't deliver when the direct thread parent was delivered via Diaspora
 723                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 724                         return ['count' => 0, 'contacts' => []];
 725                 }
 726
 727                 // Posts from Diaspora contacts are transmitted via Diaspora
 728                 if ($target_item['network'] == Protocol::DIASPORA) {
 729                         return ['count' => 0, 'contacts' => []];
 730                 }
 731
 732                 $inboxes = [];
 733                 $relay_inboxes = [];
 734
 735                 $uid = $target_item['contact-uid'] ?: $target_item['uid'];
 736
 737                 if ($target_item['origin']) {
 738                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 739
 740                         if (in_array($target_item['private'], [Item::PUBLIC])) {
 741                                 $inboxes = ActivityPub\Transmitter::addRelayServerInboxesForItem($target_item['id'], $inboxes);
 742                                 $relay_inboxes = ActivityPub\Transmitter::addRelayServerInboxes();
 743                         }
 744
 745                         Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 746                 } elseif (Item::isForumPost($target_item, $owner)) {
 747                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid, false, 0, true);
 748                         Logger::log('Forum item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 749                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 750                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 751                         return ['count' => 0, 'contacts' => []];
 752                 } elseif ($parent['origin']) {
 753                         // Remote items are transmitted via the personal inboxes.
 754                         // Doing so ensures that the dedicated receiver will get the message.
 755                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, true, $target_item['id']);
 756
 757                         if (in_array($target_item['private'], [Item::PUBLIC])) {
 758                                 $inboxes = ActivityPub\Transmitter::addRelayServerInboxesForItem($parent['id'], $inboxes);
 759                                 $relay_inboxes = ActivityPub\Transmitter::addRelayServerInboxes([]);
 760                         }
 761
 762                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 763                 }
 764
 765                 if (empty($inboxes) && empty($relay_inboxes)) {
 766                         Logger::log('No inboxes found for item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 767                         return ['count' => 0, 'contacts' => []];
 768                 }
 769
 770                 // Fill the item cache
 771                 ActivityPub\Transmitter::createCachedActivityFromItem($target_item['id'], true);
 772
 773                 $delivery_queue_count = 0;
 774                 $contacts = [];
 775
 776                 foreach ($inboxes as $inbox => $receivers) {
 777                         $contacts = array_merge($contacts, $receivers);
 778
 779                         Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'inbox' => $inbox]);
 780
 781                         if (Worker::add(['priority' => $priority, 'created' => $created, 'dont_fork' => true],
 782                                         'APDelivery', $cmd, $target_item['id'], $inbox, $uid, $receivers, $target_item['uri-id'])) {
 783                                 $delivery_queue_count++;
 784                         }
 785                 }
 786
 787                 // We deliver posts to relay servers slightly delayed to priorize the direct delivery
 788                 foreach ($relay_inboxes as $inbox) {
 789                         Logger::info('Delivery to relay servers via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'inbox' => $inbox]);
 790
 791                         if (Worker::add(['priority' => $priority, 'dont_fork' => true], 'APDelivery', $cmd, $target_item['id'], $inbox, $uid, [], $target_item['uri-id'])) {
 792                                 $delivery_queue_count++;
 793                         }
 794                 }
 795
 796                 return ['count' => $delivery_queue_count, 'contacts' => $contacts];
 797         }
 798
 799         /**
 800          * Check if the delivered item is a forum post
 801          *
 802          * @param array $item
 803          * @return boolean
 804          */
 805         public static function isForumPost(array $item)
 806         {
 807                 return ($item['gravity'] == GRAVITY_PARENT) && !empty($item['forum_mode']);
 808         }
 809 }