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\ItemDeliveryData;
  36 use Friendica\Model\PushSubscriber;
  37 use Friendica\Model\User;
  38 use Friendica\Network\Probe;
  39 use Friendica\Protocol\ActivityPub;
  40 use Friendica\Protocol\Diaspora;
  41 use Friendica\Protocol\OStatus;
  42 use Friendica\Protocol\Salmon;
  43
  44 require_once 'include/items.php';
  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                                         $item['deleted'] = 1;
 133                                 }
 134                         }
 135
 136                         if ((count($items) == 1) && ($items[0]['id'] === $target_item['id']) && ($items[0]['uri'] === $items[0]['parent-uri'])) {
 137                                 Logger::info('Top level post', ['target' => $target_id]);
 138                                 $top_level = true;
 139                         }
 140                 }
 141
 142                 $owner = User::getOwnerDataById($uid);
 143                 if (!$owner) {
 144                         Logger::info('Owner not found', ['cmd' => $cmd, 'target' => $target_id]);
 145                         return;
 146                 }
 147
 148                 // Should the post be transmitted to Diaspora?
 149                 $diaspora_delivery = true;
 150
 151                 // If this is a public conversation, notify the feed hub
 152                 $public_message = true;
 153
 154                 // Do a PuSH
 155                 $push_notify = false;
 156
 157                 // Deliver directly to a forum, don't PuSH
 158                 $direct_forum_delivery = false;
 159
 160                 $followup = false;
 161                 $recipients_followup = [];
 162
 163                 if (!empty($target_item) && !empty($items)) {
 164                         $parent = $items[0];
 165
 166                         $fields = ['network', 'author-id', 'author-link', 'owner-id'];
 167                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 168                         $thr_parent = Item::selectFirst($fields, $condition);
 169                         if (empty($thr_parent)) {
 170                                 $thr_parent = $parent;
 171                         }
 172
 173                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 174
 175                         if (!self::isRemovalActivity($cmd, $owner, Protocol::ACTIVITYPUB)) {
 176                                 $delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $thr_parent, $a->queue['priority'], $a->queue['created'], $owner);
 177                         }
 178
 179                         // Only deliver threaded replies (comment to a comment) to Diaspora
 180                         // when the original comment author does support the Diaspora protocol.
 181                         if ($target_item['parent-uri'] != $target_item['thr-parent']) {
 182                                 $diaspora_delivery = Diaspora::isSupportedByContactUrl($thr_parent['author-link']);
 183                                 Logger::info('Threaded comment', ['diaspora_delivery' => (int)$diaspora_delivery]);
 184                         }
 185
 186                         // This is IMPORTANT!!!!
 187
 188                         // We will only send a "notify owner to relay" or followup message if the referenced post
 189                         // originated on our system by virtue of having our hostname somewhere
 190                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 191
 192                         // if $parent['wall'] == 1 we will already have the parent message in our array
 193                         // and we will relay the whole lot.
 194
 195                         $localhost = str_replace('www.','', DI::baseUrl()->getHostname());
 196                         if (strpos($localhost,':')) {
 197                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 198                         }
 199                         /**
 200                          *
 201                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 202                          * have been known to cause runaway conditions which affected several servers, along with
 203                          * permissions issues.
 204                          *
 205                          */
 206
 207                         $relay_to_owner = false;
 208
 209                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 210                                 $relay_to_owner = true;
 211                         }
 212
 213                         if (($cmd === Delivery::UPLINK) && (intval($parent['forum_mode']) == 1) && !$top_level) {
 214                                 $relay_to_owner = true;
 215                         }
 216
 217                         // until the 'origin' flag has been in use for several months
 218                         // we will just use it as a fallback test
 219                         // later we will be able to use it as the primary test of whether or not to relay.
 220
 221                         if (!$target_item['origin']) {
 222                                 $relay_to_owner = false;
 223                         }
 224                         if ($parent['origin']) {
 225                                 $relay_to_owner = false;
 226                         }
 227
 228                         // Special treatment for forum posts
 229                         if (Item::isForumPost($target_item, $owner)) {
 230                                 $relay_to_owner = true;
 231                                 $direct_forum_delivery = true;
 232                         }
 233
 234                         // Avoid that comments in a forum thread are sent to OStatus
 235                         if (Item::isForumPost($parent, $owner)) {
 236                                 $direct_forum_delivery = true;
 237                         }
 238
 239                         if ($relay_to_owner) {
 240                                 // local followup to remote post
 241                                 $followup = true;
 242                                 $public_message = false; // not public
 243                                 $recipients = [$parent['contact-id']];
 244                                 $recipients_followup  = [$parent['contact-id']];
 245
 246                                 Logger::info('Followup', ['target' => $target_id, 'guid' => $target_item['guid'], 'to' => $parent['contact-id']]);
 247
 248                                 //if (!$target_item['private'] && $target_item['wall'] &&
 249                                 if (!$target_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
 303                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== Delivery::UPLINK)) {
 304                                         Worker::add($a->queue['priority'], 'Notifier', Delivery::UPLINK, $target_id);
 305                                 }
 306
 307                                 foreach ($items as $item) {
 308                                         $recipients[] = $item['contact-id'];
 309                                         // pull out additional tagged people to notify (if public message)
 310                                         if ($public_message && strlen($item['inform'])) {
 311                                                 $people = explode(',',$item['inform']);
 312                                                 foreach ($people as $person) {
 313                                                         if (substr($person,0,4) === 'cid:') {
 314                                                                 $recipients[] = intval(substr($person,4));
 315                                                         } else {
 316                                                                 $url_recipients[] = substr($person,4);
 317                                                         }
 318                                                 }
 319                                         }
 320                                 }
 321
 322                                 if (count($url_recipients)) {
 323                                         Logger::notice('Deliver', ['target' => $target_id, 'guid' => $target_item['guid'], 'recipients' => $url_recipients]);
 324                                 }
 325
 326                                 $recipients = array_unique(array_merge($recipients, $allow_people, $allow_groups));
 327                                 $deny = array_unique(array_merge($deny_people, $deny_groups));
 328                                 $recipients = array_diff($recipients, $deny);
 329
 330                                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 331                                 if (
 332                                         function_exists('imap_open')
 333                                         && !DI::config()->get('system','imap_disabled')
 334                                         && $public_message
 335                                         && intval($target_item['pubmail'])
 336                                 ) {
 337                                         $mail_contacts_stmt = DBA::select('contact', ['id'], ['uid' => $uid, 'network' => Protocol::MAIL]);
 338                                         while ($mail_contact = DBA::fetch($mail_contacts_stmt)) {
 339                                                 $recipients[] = $mail_contact['id'];
 340                                         }
 341                                         DBA::close($mail_contacts_stmt);
 342                                 }
 343                         }
 344
 345                         // If the thread parent is OStatus then do some magic to distribute the messages.
 346                         // We have not only to look at the parent, since it could be a Friendica thread.
 347                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 348                                 $diaspora_delivery = false;
 349
 350                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 351
 352                                 // Send a salmon to the parent author
 353                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 354                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 355                                         Logger::log('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 356                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 357                                 }
 358
 359                                 // Send a salmon to the parent owner
 360                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 361                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 362                                         Logger::log('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 363                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 364                                 }
 365
 366                                 // Send a salmon notification to every person we mentioned in the post
 367                                 $arr = explode(',',$target_item['tag']);
 368                                 foreach ($arr as $x) {
 369                                         //Logger::log('Checking tag '.$x, Logger::DEBUG);
 370                                         $matches = null;
 371                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 372                                                         $probed_contact = Probe::uri($matches[1]);
 373                                                 if ($probed_contact["notify"] != "") {
 374                                                         Logger::log('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 375                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 376                                                 }
 377                                         }
 378                                 }
 379
 380                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 381                                 $networks = [Protocol::DFRN];
 382                         } elseif ($diaspora_delivery) {
 383                                 $networks = [Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 384                                 if (($parent['network'] == Protocol::DIASPORA) || ($thr_parent['network'] == Protocol::DIASPORA)) {
 385                                         Logger::info('Add AP contacts', ['target' => $target_id, 'guid' => $target_item['guid']]);
 386                                         $networks[] = Protocol::ACTIVITYPUB;
 387                                 }
 388                         } else {
 389                                 $networks = [Protocol::DFRN, Protocol::MAIL];
 390                         }
 391                 } else {
 392                         $public_message = false;
 393                 }
 394
 395                 if (empty($delivery_contacts_stmt)) {
 396                         if ($followup) {
 397                                 $recipients = $recipients_followup;
 398                         }
 399                         $condition = ['id' => $recipients, 'self' => false,
 400                                 'blocked' => false, 'pending' => false, 'archive' => false];
 401                         if (!empty($networks)) {
 402                                 $condition['network'] = $networks;
 403                         }
 404                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'addr', 'url', 'network', 'protocol', 'batch'], $condition);
 405                 }
 406
 407                 $conversants = [];
 408                 $batch_delivery = false;
 409
 410                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 411                         $relay_list = [];
 412
 413                         if ($diaspora_delivery) {
 414                                 $batch_delivery = true;
 415
 416                                 $relay_list_stmt = DBA::p(
 417                                         "SELECT
 418                                                 `batch`,
 419                                                 ANY_VALUE(`id`) AS `id`,
 420                                                 ANY_VALUE(`url`) AS `url`,
 421                                                 ANY_VALUE(`name`) AS `name`,
 422                                                 ANY_VALUE(`network`) AS `network`,
 423                                                 ANY_VALUE(`protocol`) AS `protocol`
 424                                         FROM `contact`
 425                                         WHERE `network` = ?
 426                                         AND `batch` != ''
 427                                         AND `uid` = ?
 428                                         AND `rel` != ?
 429                                         AND NOT `blocked`
 430                                         AND NOT `pending`
 431                                         AND NOT `archive`
 432                                         GROUP BY `batch`",
 433                                         Protocol::DIASPORA,
 434                                         $owner['uid'],
 435                                         Contact::SHARING
 436                                 );
 437                                 $relay_list = DBA::toArray($relay_list_stmt);
 438
 439                                 // Fetch the participation list
 440                                 // The function will ensure that there are no duplicates
 441                                 $relay_list = Diaspora::participantsForThread($target_id, $relay_list);
 442
 443                                 // Add the relay to the list, avoid duplicates.
 444                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 445                                 if (!$followup && !Item::isForumPost($target_item, $owner)) {
 446                                         $relay_list = Diaspora::relayList($target_id, $relay_list);
 447                                 }
 448                         }
 449
 450                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 451                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 452
 453                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'url', 'addr', 'name', 'network', 'protocol'], $condition));
 454
 455                         $r = array_merge($r2, $relay_list);
 456
 457                         if (DBA::isResult($r)) {
 458                                 foreach ($r as $rr) {
 459                                         // Ensure that local contacts are delivered via DFRN
 460                                         if (Contact::isLocal($rr['url'])) {
 461                                                 $contact['network'] = Protocol::DFRN;
 462                                         }
 463
 464                                         if (!empty($rr['addr']) && ($rr['network'] == Protocol::ACTIVITYPUB) && !DBA::exists('fcontact', ['addr' => $rr['addr']])) {
 465                                                 Logger::info('Contact is AP omly', ['target' => $target_id, 'contact' => $rr['url']]);
 466                                                 continue;
 467                                         }
 468
 469                                         if (!empty($rr['id']) && Contact::isArchived($rr['id'])) {
 470                                                 Logger::info('Contact is archived', ['target' => $target_id, 'contact' => $rr['url']]);
 471                                                 continue;
 472                                         }
 473
 474                                         if (self::isRemovalActivity($cmd, $owner, $rr['network'])) {
 475                                                 Logger::log('Skipping dropping for ' . $rr['url'] . ' since the network supports account removal commands.', Logger::DEBUG);
 476                                                 continue;
 477                                         }
 478
 479                                         if (self::skipDFRN($rr, $target_item, $parent, $thr_parent, $cmd)) {
 480                                                 Logger::info('Contact can be delivered via AP, so skip delivery via legacy DFRN/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 omly', ['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', ['target' => $target_id, 'contact' => $contact['url']]);
 521                                 continue;
 522                         }
 523
 524                         if (self::isRemovalActivity($cmd, $owner, $contact['network'])) {
 525                                 Logger::log('Skipping dropping for ' . $contact['url'] . ' since the network supports account removal commands.', Logger::DEBUG);
 526                                 continue;
 527                         }
 528
 529                         if (self::skipDFRN($contact, $target_item, $parent, $thr_parent, $cmd)) {
 530                                 Logger::info('Contact can be delivered via AP, so skip delivery via legacy DFRN/Diaspora', ['target' => $target_id, 'url' => $contact['url']]);
 531                                 continue;
 532                         }
 533
 534                         // Don't deliver to Diaspora if it already had been done as batch delivery
 535                         if (($contact['network'] == Protocol::DIASPORA) && $batch_delivery) {
 536                                 Logger::log('Already delivered  id ' . $target_id . ' via batch to ' . json_encode($contact), Logger::DEBUG);
 537                                 continue;
 538                         }
 539
 540                         // Don't deliver to folks who have already been delivered to
 541                         if (in_array($contact['id'], $conversants)) {
 542                                 Logger::log('Already delivered id ' . $target_id. ' to ' . json_encode($contact), Logger::DEBUG);
 543                                 continue;
 544                         }
 545
 546                         Logger::info('Delivery', ['id' => $target_id, 'to' => $contact]);
 547
 548                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 549                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 550                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 551                         if ($contact['network'] == Protocol::DIASPORA) {
 552                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 553                         } else {
 554                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 555                         }
 556
 557                         if (Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$contact['id'])) {
 558                                 $delivery_queue_count++;
 559                         }
 560                 }
 561                 DBA::close($delivery_contacts_stmt);
 562
 563                 $url_recipients = array_filter($url_recipients);
 564                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 565                 // They are especially used for notifications to OStatus users that don't follow us.
 566                 if (!DI::config()->get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && !empty($target_item)) {
 567                         $slap = OStatus::salmon($target_item, $owner);
 568                         foreach ($url_recipients as $url) {
 569                                 Logger::log('Salmon delivery of item ' . $target_id . ' to ' . $url);
 570                                 /// @TODO Redeliver/queue these items on failure, though there is no contact record
 571                                 $delivery_queue_count++;
 572                                 Salmon::slapper($owner, $url, $slap);
 573                                 ItemDeliveryData::incrementQueueDone($target_id, ItemDeliveryData::OSTATUS);
 574                         }
 575                 }
 576
 577                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 578                 if ($push_notify) {
 579                         Logger::log('Activating internal PuSH for item '.$target_id, Logger::DEBUG);
 580
 581                         // Handling the pubsubhubbub requests
 582                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 583                 }
 584
 585                 if (!empty($target_item)) {
 586                         Logger::log('Calling hooks for ' . $cmd . ' ' . $target_id, Logger::DEBUG);
 587
 588                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 589
 590                         Hook::callAll('notifier_end', $target_item);
 591
 592                         // Workaround for pure connector posts
 593                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 594                                 if ($delivery_queue_count == 0) {
 595                                         ItemDeliveryData::incrementQueueDone($target_item['id']);
 596                                         $delivery_queue_count = 1;
 597                                 }
 598
 599                                 ItemDeliveryData::incrementQueueCount($target_item['id'], $delivery_queue_count);
 600                         }
 601                 }
 602
 603                 return;
 604         }
 605
 606         /**
 607          * Checks if the current delivery process needs to be transported via DFRN.
 608          *
 609          * @param array  $contact    Receiver of the post
 610          * @param array  $item       The post
 611          * @param array  $parent     The parent
 612          * @param array  $thr_parent The thread parent
 613          * @param string $cmd        Notifier command
 614          * @return bool
 615          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 616          * @throws \ImagickException
 617          */
 618         private static function skipDFRN($contact, $item, $parent, $thr_parent, $cmd)
 619         {
 620                 if (empty($parent['network'])) {
 621                         return false;
 622                 }
 623
 624                 // Don't skip when the starting post is delivered via Diaspora
 625                 if ($parent['network'] == Protocol::DIASPORA) {
 626                         return false;
 627                 }
 628
 629                 // Also don't skip when the direct thread parent was delivered via Diaspora
 630                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 631                         return false;
 632                 }
 633
 634                 // Use DFRN if we are on the same site
 635                 if (!empty($contact['url']) && Contact::isLocal($contact['url'])) {
 636                         return false;
 637                 }
 638
 639                 // Don't skip when author or owner don't have AP profiles
 640                 if ((!empty($item['author-link']) && empty(APContact::getByURL($item['author-link'], false))) || (!empty($item['owner-link']) && empty(APContact::getByURL($item['owner-link'], false)))) {
 641                         return false;
 642                 }
 643
 644                 // Don't skip DFRN delivery for these commands
 645                 if (in_array($cmd, [Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION, Delivery::POKE])) {
 646                         return false;
 647                 }
 648
 649                 // We deliver reshares via AP whenever possible
 650                 if (ActivityPub\Transmitter::isAnnounce($item)) {
 651                         return true;
 652                 }
 653
 654                 // Skip DFRN when the item will be (forcefully) delivered via AP
 655                 if (DI::config()->get('debug', 'total_ap_delivery') && ($contact['network'] == Protocol::DFRN) && !empty(APContact::getByURL($contact['url'], false))) {
 656                         return true;
 657                 }
 658
 659                 // Skip DFRN delivery if the contact speaks ActivityPub
 660                 return in_array($contact['network'], [Protocol::DFRN, Protocol::DIASPORA]) && ($contact['protocol'] == Protocol::ACTIVITYPUB);
 661         }
 662
 663         /**
 664          * Checks if the current action is a deletion command of a account removal activity
 665          * For Diaspora and ActivityPub we don't need to send single item deletion calls.
 666          * These protocols do have a dedicated command for deleting a whole account.
 667          *
 668          * @param string $cmd     Notifier command
 669          * @param array  $owner   Sender of the post
 670          * @param string $network Receiver network
 671          * @return bool
 672          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 673          * @throws \ImagickException
 674          */
 675         private static function isRemovalActivity($cmd, $owner, $network)
 676         {
 677                 return ($cmd == Delivery::DELETION) && $owner['account_removed'] && in_array($network, [Protocol::ACTIVITYPUB, Protocol::DIASPORA]);
 678         }
 679
 680         /**
 681          * @param int    $self_user_id
 682          * @param int    $priority The priority the Notifier queue item was created with
 683          * @param string $created  The date the Notifier queue item was created on
 684          * @return bool
 685          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 686          * @throws \ImagickException
 687          */
 688         private static function notifySelfRemoval($self_user_id, $priority, $created)
 689         {
 690                 $owner = User::getOwnerDataById($self_user_id);
 691                 if (!$owner) {
 692                         return false;
 693                 }
 694
 695                 $contacts_stmt = DBA::select('contact', [], ['self' => false, 'uid' => $self_user_id]);
 696                 if (!DBA::isResult($contacts_stmt)) {
 697                         return false;
 698                 }
 699
 700                 while($contact = DBA::fetch($contacts_stmt)) {
 701                         Contact::terminateFriendship($owner, $contact, true);
 702                 }
 703                 DBA::close($contacts_stmt);
 704
 705                 $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 706                 foreach ($inboxes as $inbox) {
 707                         Logger::info('Account removal via ActivityPub', ['uid' => $self_user_id, 'inbox' => $inbox]);
 708                         Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $created, 'dont_fork' => true],
 709                                 'APDelivery', Delivery::REMOVAL, '', $inbox, $self_user_id);
 710                 }
 711
 712                 return true;
 713         }
 714
 715         /**
 716          * @param string $cmd
 717          * @param array  $target_item
 718          * @param array  $parent
 719          * @param array  $thr_parent
 720          * @param int    $priority The priority the Notifier queue item was created with
 721          * @param string $created  The date the Notifier queue item was created on
 722          * @return int The number of delivery tasks created
 723          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 724          * @throws \ImagickException
 725          */
 726         private static function activityPubDelivery($cmd, array $target_item, array $parent, array $thr_parent, $priority, $created, $owner)
 727         {
 728                 // Don't deliver via AP when the starting post is delivered via Diaspora
 729                 if ($parent['network'] == Protocol::DIASPORA) {
 730                         return 0;
 731                 }
 732
 733                 // Also don't deliver  when the direct thread parent was delivered via Diaspora
 734                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 735                         return 0;
 736                 }
 737
 738                 $inboxes = [];
 739
 740                 $uid = $target_item['contact-uid'] ?: $target_item['uid'];
 741
 742                 if ($target_item['origin']) {
 743                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 744                         Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 745                 } elseif (Item::isForumPost($target_item, $owner)) {
 746                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid, false, 0, true);
 747                         Logger::log('Forum item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 748                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 749                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 750                         return 0;
 751                 } elseif ($parent['origin']) {
 752                         // Remote items are transmitted via the personal inboxes.
 753                         // Doing so ensures that the dedicated receiver will get the message.
 754                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, true, $target_item['id']);
 755                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 756                 }
 757
 758                 if (empty($inboxes)) {
 759                         Logger::log('No inboxes found for item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 760                         return 0;
 761                 }
 762
 763                 // Fill the item cache
 764                 ActivityPub\Transmitter::createCachedActivityFromItem($target_item['id'], true);
 765
 766                 $delivery_queue_count = 0;
 767
 768                 foreach ($inboxes as $inbox) {
 769                         Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'inbox' => $inbox]);
 770
 771                         if (Worker::add(['priority' => $priority, 'created' => $created, 'dont_fork' => true],
 772                                         'APDelivery', $cmd, $target_item['id'], $inbox, $uid)) {
 773                                 $delivery_queue_count++;
 774                         }
 775                 }
 776
 777                 return $delivery_queue_count;
 778         }
 779 }