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\APContact;
  31 use Friendica\Model\Contact;
  32 use Friendica\Model\Conversation;
  33 use Friendica\Model\Group;
  34 use Friendica\Model\Item;
  35 use Friendica\Model\Post;
  36 use Friendica\Model\PushSubscriber;
  37 use Friendica\Model\Tag;
  38 use Friendica\Model\User;
  39 use Friendica\Protocol\Activity;
  40 use Friendica\Protocol\ActivityPub;
  41 use Friendica\Protocol\Diaspora;
  42 use Friendica\Protocol\OStatus;
  43 use Friendica\Protocol\Relay;
  44 use Friendica\Protocol\Salmon;
  45
  46 /*
  47  * The notifier is typically called with:
  48  *
  49  *              Worker::add(PRIORITY_HIGH, "Notifier", COMMAND, ITEM_ID);
  50  *
  51  * where COMMAND is one of the constants that are defined in Worker/Delivery.php
  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 = DI::app();
  60
  61                 Logger::info('Invoked', ['cmd' => $cmd, 'target' => $target_id]);
  62
  63                 $top_level = false;
  64                 $recipients = [];
  65                 $url_recipients = [];
  66
  67                 $delivery_contacts_stmt = null;
  68                 $target_item = [];
  69                 $parent = [];
  70                 $thr_parent = [];
  71                 $items = [];
  72                 $delivery_queue_count = 0;
  73
  74                 if ($cmd == Delivery::MAIL) {
  75                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $target_id]);
  76                         if (!DBA::isResult($message)) {
  77                                 return;
  78                         }
  79                         $uid = $message['uid'];
  80                         $recipients[] = $message['contact-id'];
  81
  82                         $mail = ActivityPub\Transmitter::ItemArrayFromMail($target_id);
  83                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($mail, $uid, true);
  84                         foreach ($inboxes as $inbox) {
  85                                 Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'target' => $target_id, 'inbox' => $inbox]);
  86                                 Worker::add(['priority' => PRIORITY_HIGH, 'created' => $a->queue['created'], 'dont_fork' => true],
  87                                         'APDelivery', $cmd, $target_id, $inbox, $uid);
  88                         }
  89                 } elseif ($cmd == Delivery::SUGGESTION) {
  90                         $suggest = DI::fsuggest()->getById($target_id);
  91                         $uid = $suggest->uid;
  92                         $recipients[] = $suggest->cid;
  93                 } elseif ($cmd == Delivery::REMOVAL) {
  94                         return self::notifySelfRemoval($target_id, $a->queue['priority'], $a->queue['created']);
  95                 } elseif ($cmd == Delivery::RELOCATION) {
  96                         $uid = $target_id;
  97
  98                         $condition = ['uid' => $target_id, 'self' => false, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  99                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'addr', 'network', 'protocol', 'batch'], $condition);
 100                 } else {
 101                         // find ancestors
 102                         $condition = ['id' => $target_id, 'visible' => true, 'moderated' => false];
 103                         $target_item = Item::selectFirst([], $condition);
 104
 105                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
 106                                 Logger::info('No target item', ['cmd' => $cmd, 'target' => $target_id]);
 107                                 return;
 108                         }
 109
 110                         if (!empty($target_item['contact-uid'])) {
 111                                 $uid = $target_item['contact-uid'];
 112                         } elseif (!empty($target_item['uid'])) {
 113                                 $uid = $target_item['uid'];
 114                         } else {
 115                                 Logger::info('Only public users, quitting', ['target' => $target_id]);
 116                                 return;
 117                         }
 118
 119                         $condition = ['parent' => $target_item['parent'], 'visible' => true, 'moderated' => false];
 120                         $params = ['order' => ['id']];
 121                         $items_stmt = Item::select([], $condition, $params);
 122                         if (!DBA::isResult($items_stmt)) {
 123                                 Logger::info('No item found', ['cmd' => $cmd, 'target' => $target_id]);
 124                                 return;
 125                         }
 126
 127                         $items = Item::inArray($items_stmt);
 128
 129                         // avoid race condition with deleting entries
 130                         if ($items[0]['deleted']) {
 131                                 foreach ($items as $item) {
 132                                         $item['deleted'] = 1;
 133                                 }
 134                         }
 135
 136                         $top_level = $target_item['gravity'] == GRAVITY_PARENT;
 137                 }
 138
 139                 $owner = User::getOwnerDataById($uid);
 140                 if (!$owner) {
 141                         Logger::info('Owner not found', ['cmd' => $cmd, 'target' => $target_id]);
 142                         return;
 143                 }
 144
 145                 // Should the post be transmitted to Diaspora?
 146                 $diaspora_delivery = true;
 147
 148                 // If this is a public conversation, notify the feed hub
 149                 $public_message = true;
 150
 151                 $unlisted = false;
 152
 153                 // Do a PuSH
 154                 $push_notify = false;
 155
 156                 // Deliver directly to a forum, don't PuSH
 157                 $direct_forum_delivery = false;
 158
 159                 $followup = false;
 160                 $recipients_followup = [];
 161
 162                 if (!empty($target_item) && !empty($items)) {
 163                         $parent = $items[0];
 164
 165                         $fields = ['network', 'author-id', 'author-link', 'author-network', 'owner-id'];
 166                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 167                         $thr_parent = Item::selectFirst($fields, $condition);
 168                         if (empty($thr_parent)) {
 169                                 $thr_parent = $parent;
 170                         }
 171
 172                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 173
 174                         if (!self::isRemovalActivity($cmd, $owner, Protocol::ACTIVITYPUB)) {
 175                                 $delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $thr_parent, $a->queue['priority'], $a->queue['created'], $owner);
 176                         }
 177
 178                         // Only deliver threaded replies (comment to a comment) to Diaspora
 179                         // when the original comment author does support the Diaspora protocol.
 180                         if ($thr_parent['author-link'] && $target_item['parent-uri'] != $target_item['thr-parent']) {
 181                                 $diaspora_delivery = Diaspora::isSupportedByContactUrl($thr_parent['author-link']);
 182                                 Logger::info('Threaded comment', ['diaspora_delivery' => (int)$diaspora_delivery]);
 183                         }
 184
 185                         $unlisted = $target_item['private'] == Item::UNLISTED;
 186
 187                         // This is IMPORTANT!!!!
 188
 189                         // We will only send a "notify owner to relay" or followup message if the referenced post
 190                         // originated on our system by virtue of having our hostname somewhere
 191                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 192
 193                         // if $parent['wall'] == 1 we will already have the parent message in our array
 194                         // and we will relay the whole lot.
 195
 196                         $localhost = str_replace('www.','', DI::baseUrl()->getHostname());
 197                         if (strpos($localhost,':')) {
 198                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 199                         }
 200                         /**
 201                          *
 202                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 203                          * have been known to cause runaway conditions which affected several servers, along with
 204                          * permissions issues.
 205                          *
 206                          */
 207
 208                         $relay_to_owner = false;
 209
 210                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 211                                 $relay_to_owner = true;
 212                         }
 213
 214                         if (($cmd === Delivery::UPLINK) && (intval($parent['forum_mode']) == 1) && !$top_level) {
 215                                 $relay_to_owner = true;
 216                         }
 217
 218                         // until the 'origin' flag has been in use for several months
 219                         // we will just use it as a fallback test
 220                         // later we will be able to use it as the primary test of whether or not to relay.
 221
 222                         if (!$target_item['origin']) {
 223                                 $relay_to_owner = false;
 224                         }
 225                         if ($parent['origin']) {
 226                                 $relay_to_owner = false;
 227                         }
 228
 229                         // Special treatment for forum posts
 230                         if (Item::isForumPost($target_item, $owner)) {
 231                                 $relay_to_owner = true;
 232                                 $direct_forum_delivery = true;
 233                         }
 234
 235                         // Avoid that comments in a forum thread are sent to OStatus
 236                         if (Item::isForumPost($parent, $owner)) {
 237                                 $direct_forum_delivery = true;
 238                         }
 239
 240                         if ($relay_to_owner) {
 241                                 // local followup to remote post
 242                                 $followup = true;
 243                                 $public_message = false; // not public
 244                                 $recipients = [$parent['contact-id']];
 245                                 $recipients_followup  = [$parent['contact-id']];
 246
 247                                 Logger::info('Followup', ['target' => $target_id, 'guid' => $target_item['guid'], 'to' => $parent['contact-id']]);
 248
 249                                 if (($target_item['private'] != Item::PRIVATE) &&
 250                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 251                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 252                                         $push_notify = true;
 253
 254                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 255                                         $push_notify = true;
 256
 257                                         if ($parent["network"] == Protocol::OSTATUS) {
 258                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 259                                                 // Currently it is work at progress
 260                                                 $condition = ['uid' => $uid, 'network' => Protocol::DFRN, 'blocked' => false, 'pending' => false, 'archive' => false];
 261                                                 $followup_contacts_stmt = DBA::select('contact', ['id'], $condition);
 262                                                 while($followup_contact = DBA::fetch($followup_contacts_stmt)) {
 263                                                         $recipients_followup[] = $followup_contact['id'];
 264                                                 }
 265                                                 DBA::close($followup_contacts_stmt);
 266                                         }
 267                                 }
 268
 269                                 if ($direct_forum_delivery) {
 270                                         $push_notify = false;
 271                                 }
 272
 273                                 Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
 274                         } else {
 275                                 $followup = false;
 276
 277                                 Logger::info('Distributing directly', ['target' => $target_id, 'guid' => $target_item['guid']]);
 278
 279                                 // don't send deletions onward for other people's stuff
 280
 281                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 282                                         Logger::log('Ignoring delete notification for non-wall item');
 283                                         return;
 284                                 }
 285
 286                                 if (strlen($parent['allow_cid'])
 287                                         || strlen($parent['allow_gid'])
 288                                         || strlen($parent['deny_cid'])
 289                                         || strlen($parent['deny_gid'])) {
 290                                         $public_message = false; // private recipients, not public
 291                                 }
 292
 293                                 $aclFormatter = DI::aclFormatter();
 294
 295                                 $allow_people = $aclFormatter->expand($parent['allow_cid']);
 296                                 $allow_groups = Group::expand($uid, $aclFormatter->expand($parent['allow_gid']),true);
 297                                 $deny_people  = $aclFormatter->expand($parent['deny_cid']);
 298                                 $deny_groups  = Group::expand($uid, $aclFormatter->expand($parent['deny_gid']));
 299
 300                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 301                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 302                                 /// @todo Possibly we should not uplink when the author is the forum itself?
 303
 304                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== Delivery::UPLINK)
 305                                         && ($target_item['verb'] != Activity::ANNOUNCE)) {
 306                                         Worker::add($a->queue['priority'], 'Notifier', Delivery::UPLINK, $target_id);
 307                                 }
 308
 309                                 foreach ($items as $item) {
 310                                         $recipients[] = $item['contact-id'];
 311                                         // pull out additional tagged people to notify (if public message)
 312                                         if ($public_message && strlen($item['inform'])) {
 313                                                 $people = explode(',',$item['inform']);
 314                                                 foreach ($people as $person) {
 315                                                         if (substr($person,0,4) === 'cid:') {
 316                                                                 $recipients[] = intval(substr($person,4));
 317                                                         } else {
 318                                                                 $url_recipients[] = substr($person,4);
 319                                                         }
 320                                                 }
 321                                         }
 322                                 }
 323
 324                                 if (count($url_recipients)) {
 325                                         Logger::notice('Deliver', ['target' => $target_id, 'guid' => $target_item['guid'], 'recipients' => $url_recipients]);
 326                                 }
 327
 328                                 $recipients = array_unique(array_merge($recipients, $allow_people, $allow_groups));
 329                                 $deny = array_unique(array_merge($deny_people, $deny_groups));
 330                                 $recipients = array_diff($recipients, $deny);
 331
 332                                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 333                                 if (
 334                                         function_exists('imap_open')
 335                                         && !DI::config()->get('system','imap_disabled')
 336                                         && $public_message
 337                                         && intval($target_item['pubmail'])
 338                                 ) {
 339                                         $mail_contacts_stmt = DBA::select('contact', ['id'], ['uid' => $uid, 'network' => Protocol::MAIL]);
 340                                         while ($mail_contact = DBA::fetch($mail_contacts_stmt)) {
 341                                                 $recipients[] = $mail_contact['id'];
 342                                         }
 343                                         DBA::close($mail_contacts_stmt);
 344                                 }
 345                         }
 346
 347                         // If the thread parent is OStatus then do some magic to distribute the messages.
 348                         // We have not only to look at the parent, since it could be a Friendica thread.
 349                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 350                                 $diaspora_delivery = false;
 351
 352                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 353
 354                                 // Send a salmon to the parent author
 355                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 356                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 357                                         Logger::notice('Notify parent author', ['url' => $probed_contact["url"], 'notify' => $probed_contact["notify"]]);
 358                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 359                                 }
 360
 361                                 // Send a salmon to the parent owner
 362                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 363                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 364                                         Logger::notice('Notify parent owner', ['url' => $probed_contact["url"], 'notify' => $probed_contact["notify"]]);
 365                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 366                                 }
 367
 368                                 // Send a salmon notification to every person we mentioned in the post
 369                                 foreach (Tag::getByURIId($target_item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION, Tag::IMPLICIT_MENTION]) as $tag) {
 370                                         $probed_contact = Contact::getByURL($tag['url']);
 371                                         if (!empty($probed_contact['notify'])) {
 372                                                 Logger::notice('Notify mentioned user', ['url' => $probed_contact["url"], 'notify' => $probed_contact["notify"]]);
 373                                                 $url_recipients[$probed_contact['notify']] = $probed_contact['notify'];
 374                                         }
 375                                 }
 376
 377                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 378                                 $networks = [Protocol::DFRN];
 379                         } elseif ($diaspora_delivery) {
 380                                 $networks = [Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 381                                 if (($parent['network'] == Protocol::DIASPORA) || ($thr_parent['network'] == Protocol::DIASPORA)) {
 382                                         Logger::info('Add AP contacts', ['target' => $target_id, 'guid' => $target_item['guid']]);
 383                                         $networks[] = Protocol::ACTIVITYPUB;
 384                                 }
 385                         } else {
 386                                 $networks = [Protocol::DFRN, Protocol::MAIL];
 387                         }
 388                 } else {
 389                         $public_message = false;
 390                 }
 391
 392                 if (empty($delivery_contacts_stmt)) {
 393                         if ($followup) {
 394                                 $recipients = $recipients_followup;
 395                         }
 396                         $condition = ['id' => $recipients, 'self' => false, 'uid' => [0, $uid],
 397                                 'blocked' => false, 'pending' => false, 'archive' => false];
 398                         if (!empty($networks)) {
 399                                 $condition['network'] = $networks;
 400                         }
 401                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'addr', 'url', 'network', 'protocol', 'batch'], $condition);
 402                 }
 403
 404                 $conversants = [];
 405                 $batch_delivery = false;
 406
 407                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 408                         $relay_list = [];
 409
 410                         if ($diaspora_delivery && !$unlisted) {
 411                                 $batch_delivery = true;
 412
 413                                 $relay_list_stmt = DBA::p(
 414                                         "SELECT
 415                                                 `batch`, `network`, `protocol`,
 416                                                 ANY_VALUE(`id`) AS `id`,
 417                                                 ANY_VALUE(`url`) AS `url`,
 418                                                 ANY_VALUE(`name`) AS `name`
 419                                         FROM `contact`
 420                                         WHERE `network` = ?
 421                                         AND `batch` != ''
 422                                         AND `uid` = ?
 423                                         AND `rel` != ?
 424                                         AND NOT `blocked`
 425                                         AND NOT `pending`
 426                                         AND NOT `archive`
 427                                         GROUP BY `batch`, `network`, `protocol`",
 428                                         Protocol::DIASPORA,
 429                                         $owner['uid'],
 430                                         Contact::SHARING
 431                                 );
 432                                 $relay_list = DBA::toArray($relay_list_stmt);
 433
 434                                 // Fetch the participation list
 435                                 // The function will ensure that there are no duplicates
 436                                 $relay_list = Diaspora::participantsForThread($target_item, $relay_list);
 437
 438                                 // Add the relay to the list, avoid duplicates.
 439                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 440                                 if (!$followup && !Item::isForumPost($target_item, $owner) && !self::isForumPost($target_item)) {
 441                                         $relay_list = Relay::getList($target_id, $relay_list, [Protocol::DFRN, Protocol::DIASPORA]);
 442                                 }
 443                         }
 444
 445                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 446                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 447
 448                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'url', 'addr', 'name', 'network', 'protocol'], $condition));
 449
 450                         $r = array_merge($r2, $relay_list);
 451
 452                         if (DBA::isResult($r)) {
 453                                 foreach ($r as $rr) {
 454                                         // Ensure that local contacts are delivered via DFRN
 455                                         if (Contact::isLocal($rr['url'])) {
 456                                                 $contact['network'] = Protocol::DFRN;
 457                                         }
 458
 459                                         if (!empty($rr['addr']) && ($rr['network'] == Protocol::ACTIVITYPUB) && !DBA::exists('fcontact', ['addr' => $rr['addr']])) {
 460                                                 Logger::info('Contact is AP only, so skip delivery via legacy DFRN/Diaspora', ['target' => $target_id, 'contact' => $rr['url']]);
 461                                                 continue;
 462                                         }
 463
 464                                         if (!empty($rr['id']) && Contact::isArchived($rr['id'])) {
 465                                                 Logger::info('Contact is archived, so skip delivery', ['target' => $target_id, 'contact' => $rr['url']]);
 466                                                 continue;
 467                                         }
 468
 469                                         if (self::isRemovalActivity($cmd, $owner, $rr['network'])) {
 470                                                 Logger::info('Contact does no supports account removal commands, so skip delivery', ['target' => $target_id, 'contact' => $rr['url']]);
 471                                                 continue;
 472                                         }
 473
 474                                         if (self::skipDFRN($rr, $target_item, $parent, $thr_parent, $owner, $cmd)) {
 475                                                 Logger::info('Content will be delivered via AP, so skip delivery via legacy DFRN/Diaspora', ['id' => $target_id, 'url' => $rr['url']]);
 476                                                 continue;
 477                                         }
 478
 479                                         if (self::skipActivityPubForDiaspora($rr, $target_item, $thr_parent)) {
 480                                                 Logger::info('Contact is from Diaspora, but the replied author is from ActivityPub, so skip delivery via Diaspora', ['id' => $target_id, 'url' => $rr['url']]);
 481                                                 continue;
 482                                         }
 483
 484                                         $conversants[] = $rr['id'];
 485
 486                                         Logger::info('Public delivery', ['target' => $target_id, 'guid' => $target_item["guid"], 'to' => $rr]);
 487
 488                                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 489                                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 490                                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 491                                         // This is only important for high and medium priority tasks and not for Low priority jobs like deletions.
 492                                         if (($rr['network'] == Protocol::DIASPORA) && in_array($a->queue['priority'], [PRIORITY_HIGH, PRIORITY_MEDIUM])) {
 493                                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 494                                         } else {
 495                                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 496                                         }
 497
 498                                         if (Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$rr['id'])) {
 499                                                 $delivery_queue_count++;
 500                                         }
 501                                 }
 502                         }
 503
 504                         $push_notify = true;
 505                 }
 506
 507                 // delivery loop
 508                 while ($contact = DBA::fetch($delivery_contacts_stmt)) {
 509                         // Ensure that local contacts are delivered via DFRN
 510                         if (Contact::isLocal($contact['url'])) {
 511                                 $contact['network'] = Protocol::DFRN;
 512                         }
 513
 514                         if (!empty($contact['addr']) && ($contact['network'] == Protocol::ACTIVITYPUB) && !DBA::exists('fcontact', ['addr' => $contact['addr']])) {
 515                                 Logger::info('Contact is AP only, so skip delivery via legacy DFRN/Diaspora', ['target' => $target_id, 'contact' => $contact['url']]);
 516                                 continue;
 517                         }
 518
 519                         if (!empty($contact['id']) && Contact::isArchived($contact['id'])) {
 520                                 Logger::info('Contact is archived, so skip delivery', ['target' => $target_id, 'contact' => $contact['url']]);
 521                                 continue;
 522                         }
 523
 524                         if (self::isRemovalActivity($cmd, $owner, $contact['network'])) {
 525                                 Logger::info('Contact does no supports account removal commands, so skip delivery', ['target' => $target_id, 'contact' => $contact['url']]);
 526                                 continue;
 527                         }
 528
 529                         if (self::skipDFRN($contact, $target_item, $parent, $thr_parent, $owner, $cmd)) {
 530                                 Logger::info('Content will be delivered via AP, so skip delivery via legacy DFRN/Diaspora', ['target' => $target_id, 'url' => $contact['url']]);
 531                                 continue;
 532                         }
 533
 534                         if (self::skipActivityPubForDiaspora($contact, $target_item, $thr_parent)) {
 535                                 Logger::info('Contact is from Diaspora, but the replied author is from ActivityPub, so skip delivery via Diaspora', ['id' => $target_id, 'url' => $contact['url']]);
 536                                 continue;
 537                         }
 538
 539                         // Don't deliver to Diaspora if it already had been done as batch delivery
 540                         if (($contact['network'] == Protocol::DIASPORA) && $batch_delivery) {
 541                                 Logger::log('Already delivered  id ' . $target_id . ' via batch to ' . json_encode($contact), Logger::DEBUG);
 542                                 continue;
 543                         }
 544
 545                         // Don't deliver to folks who have already been delivered to
 546                         if (in_array($contact['id'], $conversants)) {
 547                                 Logger::log('Already delivered id ' . $target_id. ' to ' . json_encode($contact), Logger::DEBUG);
 548                                 continue;
 549                         }
 550
 551                         Logger::info('Delivery', ['id' => $target_id, 'to' => $contact]);
 552
 553                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 554                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 555                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 556                         if ($contact['network'] == Protocol::DIASPORA) {
 557                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 558                         } else {
 559                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 560                         }
 561
 562                         if (Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$contact['id'])) {
 563                                 $delivery_queue_count++;
 564                         }
 565                 }
 566                 DBA::close($delivery_contacts_stmt);
 567
 568                 $url_recipients = array_filter($url_recipients);
 569                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 570                 // They are especially used for notifications to OStatus users that don't follow us.
 571                 if (!DI::config()->get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && !empty($target_item)) {
 572                         $slap = OStatus::salmon($target_item, $owner);
 573                         foreach ($url_recipients as $url) {
 574                                 Logger::log('Salmon delivery of item ' . $target_id . ' to ' . $url);
 575                                 /// @TODO Redeliver/queue these items on failure, though there is no contact record
 576                                 $delivery_queue_count++;
 577                                 Salmon::slapper($owner, $url, $slap);
 578                                 Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Post\DeliveryData::OSTATUS);
 579                         }
 580                 }
 581
 582                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 583                 if ($push_notify) {
 584                         Logger::log('Activating internal PuSH for item '.$target_id, Logger::DEBUG);
 585
 586                         // Handling the pubsubhubbub requests
 587                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 588                 }
 589
 590                 if (!empty($target_item)) {
 591                         Logger::log('Calling hooks for ' . $cmd . ' ' . $target_id, Logger::DEBUG);
 592
 593                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 594
 595                         Hook::callAll('notifier_end', $target_item);
 596
 597                         // Workaround for pure connector posts
 598                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 599                                 if ($delivery_queue_count == 0) {
 600                                         Post\DeliveryData::incrementQueueDone($target_item['uri-id']);
 601                                         $delivery_queue_count = 1;
 602                                 }
 603
 604                                 Post\DeliveryData::incrementQueueCount($target_item['uri-id'], $delivery_queue_count);
 605                         }
 606                 }
 607
 608                 return;
 609         }
 610
 611         /**
 612          * Checks if the current delivery shouldn't be transported to Diaspora.
 613          * This is done for posts from AP authors or posts that are comments to AP authors.
 614          *
 615          * @param array  $contact    Receiver of the post
 616          * @param array  $item       The post
 617          * @param array  $thr_parent The thread parent
 618          * @return bool
 619          */
 620         private static function skipActivityPubForDiaspora(array $contact, array $item, array $thr_parent)
 621         {
 622                 // No skipping needs to be done when delivery isn't done to Diaspora
 623                 if ($contact['network'] != Protocol::DIASPORA) {
 624                         return false;
 625                 }
 626
 627                 // Skip the delivery to Diaspora if the item is from an ActivityPub author
 628                 if (!empty($item['author-network']) && ($item['author-network'] == Protocol::ACTIVITYPUB)) {
 629                         return true;
 630                 }
 631
 632                 // Skip the delivery to Diaspora if the thread parent is from an ActivityPub author
 633                 if (!empty($thr_parent['author-network']) && ($thr_parent['author-network'] == Protocol::ACTIVITYPUB)) {
 634                         return true;
 635                 }
 636
 637                 return false;
 638         }
 639
 640         /**
 641          * Checks if the current delivery process needs to be transported via DFRN.
 642          *
 643          * @param array  $contact    Receiver of the post
 644          * @param array  $item       The post
 645          * @param array  $parent     The parent
 646          * @param array  $thr_parent The thread parent
 647          * @param array  $owner      Owner array
 648          * @param string $cmd        Notifier command
 649          * @return bool
 650          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 651          * @throws \ImagickException
 652          */
 653         private static function skipDFRN($contact, $item, $parent, $thr_parent, $owner, $cmd)
 654         {
 655                 if (empty($parent['network'])) {
 656                         return false;
 657                 }
 658
 659                 // Don't skip when the starting post is delivered via Diaspora
 660                 if ($parent['network'] == Protocol::DIASPORA) {
 661                         return false;
 662                 }
 663
 664                 // Also don't skip when the direct thread parent was delivered via Diaspora
 665                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 666                         return false;
 667                 }
 668
 669                 // Use DFRN if we are on the same site
 670                 if (!empty($contact['url']) && Contact::isLocal($contact['url'])) {
 671                         return false;
 672                 }
 673
 674                 // Don't skip when author or owner don't have AP profiles
 675                 if ((!empty($item['author-link']) && empty(APContact::getByURL($item['author-link'], false))) || (!empty($item['owner-link']) && empty(APContact::getByURL($item['owner-link'], false)))) {
 676                         return false;
 677                 }
 678
 679                 // Don't skip DFRN delivery for these commands
 680                 if (in_array($cmd, [Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION, Delivery::POKE])) {
 681                         return false;
 682                 }
 683
 684                 // We deliver reshares via AP whenever possible
 685                 if (ActivityPub\Transmitter::isAnnounce($item)) {
 686                         return true;
 687                 }
 688
 689                 // For the time being we always deliver forum post via DFRN if possible
 690                 // This can be removed possible at the end of 2020 when hopefully most system can process AP forum posts
 691                 if ($owner['account-type'] == User::ACCOUNT_TYPE_COMMUNITY) {
 692                         return false;
 693                 }
 694
 695                 // Skip DFRN when the item will be (forcefully) delivered via AP
 696                 if (DI::config()->get('debug', 'total_ap_delivery') && ($contact['network'] == Protocol::DFRN) && !empty(APContact::getByURL($contact['url'], false))) {
 697                         return true;
 698                 }
 699
 700                 // Skip DFRN delivery if the contact speaks ActivityPub
 701                 return in_array($contact['network'], [Protocol::DFRN, Protocol::DIASPORA]) && ($contact['protocol'] == Protocol::ACTIVITYPUB);
 702         }
 703
 704         /**
 705          * Checks if the current action is a deletion command of a account removal activity
 706          * For Diaspora and ActivityPub we don't need to send single item deletion calls.
 707          * These protocols do have a dedicated command for deleting a whole account.
 708          *
 709          * @param string $cmd     Notifier command
 710          * @param array  $owner   Sender of the post
 711          * @param string $network Receiver network
 712          * @return bool
 713          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 714          * @throws \ImagickException
 715          */
 716         private static function isRemovalActivity($cmd, $owner, $network)
 717         {
 718                 return ($cmd == Delivery::DELETION) && $owner['account_removed'] && in_array($network, [Protocol::ACTIVITYPUB, Protocol::DIASPORA]);
 719         }
 720
 721         /**
 722          * @param int    $self_user_id
 723          * @param int    $priority The priority the Notifier queue item was created with
 724          * @param string $created  The date the Notifier queue item was created on
 725          * @return bool
 726          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 727          * @throws \ImagickException
 728          */
 729         private static function notifySelfRemoval($self_user_id, $priority, $created)
 730         {
 731                 $owner = User::getOwnerDataById($self_user_id);
 732                 if (!$owner) {
 733                         return false;
 734                 }
 735
 736                 $contacts_stmt = DBA::select('contact', [], ['self' => false, 'uid' => $self_user_id]);
 737                 if (!DBA::isResult($contacts_stmt)) {
 738                         return false;
 739                 }
 740
 741                 while($contact = DBA::fetch($contacts_stmt)) {
 742                         Contact::terminateFriendship($owner, $contact, true);
 743                 }
 744                 DBA::close($contacts_stmt);
 745
 746                 $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 747                 foreach ($inboxes as $inbox) {
 748                         Logger::info('Account removal via ActivityPub', ['uid' => $self_user_id, 'inbox' => $inbox]);
 749                         Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $created, 'dont_fork' => true],
 750                                 'APDelivery', Delivery::REMOVAL, '', $inbox, $self_user_id);
 751                 }
 752
 753                 return true;
 754         }
 755
 756         /**
 757          * @param string $cmd
 758          * @param array  $target_item
 759          * @param array  $parent
 760          * @param array  $thr_parent
 761          * @param int    $priority The priority the Notifier queue item was created with
 762          * @param string $created  The date the Notifier queue item was created on
 763          * @return int The number of delivery tasks created
 764          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 765          * @throws \ImagickException
 766          */
 767         private static function activityPubDelivery($cmd, array $target_item, array $parent, array $thr_parent, $priority, $created, $owner)
 768         {
 769                 // Don't deliver via AP when the starting post is delivered via Diaspora
 770                 if ($parent['network'] == Protocol::DIASPORA) {
 771                         return 0;
 772                 }
 773
 774                 // Also don't deliver when the direct thread parent was delivered via Diaspora
 775                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 776                         return 0;
 777                 }
 778
 779                 // Posts from Diaspora contacts are transmitted via Diaspora
 780                 if ($target_item['network'] == Protocol::DIASPORA) {
 781                         return 0;
 782                 }
 783
 784                 $inboxes = [];
 785                 $relay_inboxes = [];
 786
 787                 $uid = $target_item['contact-uid'] ?: $target_item['uid'];
 788
 789                 if ($target_item['origin']) {
 790                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 791
 792                         if (in_array($target_item['private'], [Item::PUBLIC])) {
 793                                 $inboxes = ActivityPub\Transmitter::addRelayServerInboxesForItem($target_item['id'], $inboxes);
 794                                 $relay_inboxes = ActivityPub\Transmitter::addRelayServerInboxes();
 795                         }
 796
 797                         Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 798                 } elseif (Item::isForumPost($target_item, $owner)) {
 799                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid, false, 0, true);
 800                         Logger::log('Forum item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 801                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 802                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 803                         return 0;
 804                 } elseif ($parent['origin']) {
 805                         // Remote items are transmitted via the personal inboxes.
 806                         // Doing so ensures that the dedicated receiver will get the message.
 807                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, true, $target_item['id']);
 808
 809                         if (in_array($target_item['private'], [Item::PUBLIC])) {
 810                                 $inboxes = ActivityPub\Transmitter::addRelayServerInboxesForItem($parent['id'], $inboxes);
 811                                 $relay_inboxes = ActivityPub\Transmitter::addRelayServerInboxes([]);
 812                         }
 813
 814                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 815                 }
 816
 817                 if (empty($inboxes) && empty($relay_inboxes)) {
 818                         Logger::log('No inboxes found for item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 819                         return 0;
 820                 }
 821
 822                 // Fill the item cache
 823                 ActivityPub\Transmitter::createCachedActivityFromItem($target_item['id'], true);
 824
 825                 $delivery_queue_count = 0;
 826
 827                 foreach ($inboxes as $inbox => $receivers) {
 828                         Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'inbox' => $inbox]);
 829
 830                         if (Worker::add(['priority' => $priority, 'created' => $created, 'dont_fork' => true],
 831                                         'APDelivery', $cmd, $target_item['id'], $inbox, $uid, $receivers)) {
 832                                 $delivery_queue_count++;
 833                         }
 834                 }
 835
 836                 // We deliver posts to relay servers slightly delayed to priorize the direct delivery
 837                 foreach ($relay_inboxes as $inbox => $receivers) {
 838                         Logger::info('Delivery to relay servers via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'inbox' => $inbox]);
 839
 840                         if (Worker::add(['priority' => $priority, 'dont_fork' => true], 'APDelivery', $cmd, $target_item['id'], $inbox, $uid, $receivers)) {
 841                                 $delivery_queue_count++;
 842                         }
 843                 }
 844
 845                 return $delivery_queue_count;
 846         }
 847
 848         /**
 849          * Check if the delivered item is a forum post
 850          *
 851          * @param array $item
 852          * @return boolean
 853          */
 854         public static function isForumPost(array $item)
 855         {
 856                 return !empty($item['forum_mode']);
 857         }
 858 }