src/Worker/Notifier.php

   1 <?php
   2 /**
   3  * @file src/Worker/Notifier.php
   4  */
   5 namespace Friendica\Worker;
   6
   7 use Friendica\Core\Hook;
   8 use Friendica\Core\Logger;
   9 use Friendica\Core\Protocol;
  10 use Friendica\Core\Worker;
  11 use Friendica\Database\DBA;
  12 use Friendica\DI;
  13 use Friendica\Model\APContact;
  14 use Friendica\Model\Contact;
  15 use Friendica\Model\Conversation;
  16 use Friendica\Model\Group;
  17 use Friendica\Model\Item;
  18 use Friendica\Model\ItemDeliveryData;
  19 use Friendica\Model\PushSubscriber;
  20 use Friendica\Model\User;
  21 use Friendica\Network\Probe;
  22 use Friendica\Protocol\ActivityPub;
  23 use Friendica\Protocol\Diaspora;
  24 use Friendica\Protocol\OStatus;
  25 use Friendica\Protocol\Salmon;
  26
  27 require_once 'include/items.php';
  28
  29 /*
  30  * The notifier is typically called with:
  31  *
  32  *              Worker::add(PRIORITY_HIGH, "Notifier", COMMAND, ITEM_ID);
  33  *
  34  * where COMMAND is one of the constants that are defined in Worker/Delivery.php
  35  * and ITEM_ID is the id of the item in the database that needs to be sent to others.
  36  */
  37
  38 class Notifier
  39 {
  40         public static function execute($cmd, $target_id)
  41         {
  42                 $a = DI::app();
  43
  44                 Logger::info('Invoked', ['cmd' => $cmd, 'target' => $target_id]);
  45
  46                 $top_level = false;
  47                 $recipients = [];
  48                 $url_recipients = [];
  49
  50                 $delivery_contacts_stmt = null;
  51                 $target_item = [];
  52                 $parent = [];
  53                 $thr_parent = [];
  54                 $items = [];
  55                 $delivery_queue_count = 0;
  56
  57                 if ($cmd == Delivery::MAIL) {
  58                         $message = DBA::selectFirst('mail', ['uid', 'contact-id'], ['id' => $target_id]);
  59                         if (!DBA::isResult($message)) {
  60                                 return;
  61                         }
  62                         $uid = $message['uid'];
  63                         $recipients[] = $message['contact-id'];
  64
  65                         $mail = ActivityPub\Transmitter::ItemArrayFromMail($target_id);
  66                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($mail, $uid, true);
  67                         foreach ($inboxes as $inbox) {
  68                                 Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'target' => $target_id, 'inbox' => $inbox]);
  69                                 Worker::add(['priority' => PRIORITY_HIGH, 'created' => $a->queue['created'], 'dont_fork' => true],
  70                                         'APDelivery', $cmd, $target_id, $inbox, $uid);
  71                         }
  72                 } elseif ($cmd == Delivery::SUGGESTION) {
  73                         $suggest = DI::fsuggest()->getById($target_id);
  74                         if (empty($suggest)) {
  75                                 return;
  76                         }
  77                         $uid = $suggest->uid;
  78                         $recipients[] = $suggest->cid;
  79                 } elseif ($cmd == Delivery::REMOVAL) {
  80                         return self::notifySelfRemoval($target_id, $a->queue['priority'], $a->queue['created']);
  81                 } elseif ($cmd == Delivery::RELOCATION) {
  82                         $uid = $target_id;
  83
  84                         $condition = ['uid' => $target_id, 'self' => false, 'network' => [Protocol::DFRN, Protocol::DIASPORA]];
  85                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'url', 'addr', 'network', 'protocol', 'batch'], $condition);
  86                 } else {
  87                         // find ancestors
  88                         $condition = ['id' => $target_id, 'visible' => true, 'moderated' => false];
  89                         $target_item = Item::selectFirst([], $condition);
  90
  91                         if (!DBA::isResult($target_item) || !intval($target_item['parent'])) {
  92                                 Logger::info('No target item', ['cmd' => $cmd, 'target' => $target_id]);
  93                                 return;
  94                         }
  95
  96                         if (!empty($target_item['contact-uid'])) {
  97                                 $uid = $target_item['contact-uid'];
  98                         } elseif (!empty($target_item['uid'])) {
  99                                 $uid = $target_item['uid'];
 100                         } else {
 101                                 Logger::info('Only public users, quitting', ['target' => $target_id]);
 102                                 return;
 103                         }
 104
 105                         $condition = ['parent' => $target_item['parent'], 'visible' => true, 'moderated' => false];
 106                         $params = ['order' => ['id']];
 107                         $items_stmt = Item::select([], $condition, $params);
 108                         if (!DBA::isResult($items_stmt)) {
 109                                 Logger::info('No item found', ['cmd' => $cmd, 'target' => $target_id]);
 110                                 return;
 111                         }
 112
 113                         $items = Item::inArray($items_stmt);
 114
 115                         // avoid race condition with deleting entries
 116                         if ($items[0]['deleted']) {
 117                                 foreach ($items as $item) {
 118                                         $item['deleted'] = 1;
 119                                 }
 120                         }
 121
 122                         if ((count($items) == 1) && ($items[0]['id'] === $target_item['id']) && ($items[0]['uri'] === $items[0]['parent-uri'])) {
 123                                 Logger::info('Top level post', ['target' => $target_id]);
 124                                 $top_level = true;
 125                         }
 126                 }
 127
 128                 $owner = User::getOwnerDataById($uid);
 129                 if (!$owner) {
 130                         Logger::info('Owner not found', ['cmd' => $cmd, 'target' => $target_id]);
 131                         return;
 132                 }
 133
 134                 // Should the post be transmitted to Diaspora?
 135                 $diaspora_delivery = true;
 136
 137                 // If this is a public conversation, notify the feed hub
 138                 $public_message = true;
 139
 140                 // Do a PuSH
 141                 $push_notify = false;
 142
 143                 // Deliver directly to a forum, don't PuSH
 144                 $direct_forum_delivery = false;
 145
 146                 $followup = false;
 147                 $recipients_followup = [];
 148
 149                 if (!empty($target_item) && !empty($items)) {
 150                         $parent = $items[0];
 151
 152                         $fields = ['network', 'author-id', 'author-link', 'owner-id'];
 153                         $condition = ['uri' => $target_item["thr-parent"], 'uid' => $target_item["uid"]];
 154                         $thr_parent = Item::selectFirst($fields, $condition);
 155                         if (empty($thr_parent)) {
 156                                 $thr_parent = $parent;
 157                         }
 158
 159                         Logger::log('GUID: ' . $target_item["guid"] . ': Parent is ' . $parent['network'] . '. Thread parent is ' . $thr_parent['network'], Logger::DEBUG);
 160
 161                         if (!self::isRemovalActivity($cmd, $owner, Protocol::ACTIVITYPUB)) {
 162                                 $delivery_queue_count += self::activityPubDelivery($cmd, $target_item, $parent, $thr_parent, $a->queue['priority'], $a->queue['created'], $owner);
 163                         }
 164
 165                         // Only deliver threaded replies (comment to a comment) to Diaspora
 166                         // when the original comment author does support the Diaspora protocol.
 167                         if ($target_item['parent-uri'] != $target_item['thr-parent']) {
 168                                 $diaspora_delivery = Diaspora::isSupportedByContactUrl($thr_parent['author-link']);
 169                                 Logger::info('Threaded comment', ['diaspora_delivery' => (int)$diaspora_delivery]);
 170                         }
 171
 172                         // This is IMPORTANT!!!!
 173
 174                         // We will only send a "notify owner to relay" or followup message if the referenced post
 175                         // originated on our system by virtue of having our hostname somewhere
 176                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 177
 178                         // if $parent['wall'] == 1 we will already have the parent message in our array
 179                         // and we will relay the whole lot.
 180
 181                         $localhost = str_replace('www.','', DI::baseUrl()->getHostname());
 182                         if (strpos($localhost,':')) {
 183                                 $localhost = substr($localhost,0,strpos($localhost,':'));
 184                         }
 185                         /**
 186                          *
 187                          * Be VERY CAREFUL if you make any changes to the following several lines. Seemingly innocuous changes
 188                          * have been known to cause runaway conditions which affected several servers, along with
 189                          * permissions issues.
 190                          *
 191                          */
 192
 193                         $relay_to_owner = false;
 194
 195                         if (!$top_level && ($parent['wall'] == 0) && (stristr($target_item['uri'],$localhost))) {
 196                                 $relay_to_owner = true;
 197                         }
 198
 199                         if (($cmd === Delivery::UPLINK) && (intval($parent['forum_mode']) == 1) && !$top_level) {
 200                                 $relay_to_owner = true;
 201                         }
 202
 203                         // until the 'origin' flag has been in use for several months
 204                         // we will just use it as a fallback test
 205                         // later we will be able to use it as the primary test of whether or not to relay.
 206
 207                         if (!$target_item['origin']) {
 208                                 $relay_to_owner = false;
 209                         }
 210                         if ($parent['origin']) {
 211                                 $relay_to_owner = false;
 212                         }
 213
 214                         // Special treatment for forum posts
 215                         if (Item::isForumPost($target_item, $owner)) {
 216                                 $relay_to_owner = true;
 217                                 $direct_forum_delivery = true;
 218                         }
 219
 220                         // Avoid that comments in a forum thread are sent to OStatus
 221                         if (Item::isForumPost($parent, $owner)) {
 222                                 $direct_forum_delivery = true;
 223                         }
 224
 225                         if ($relay_to_owner) {
 226                                 // local followup to remote post
 227                                 $followup = true;
 228                                 $public_message = false; // not public
 229                                 $recipients = [$parent['contact-id']];
 230                                 $recipients_followup  = [$parent['contact-id']];
 231
 232                                 Logger::info('Followup', ['target' => $target_id, 'guid' => $target_item['guid'], 'to' => $parent['contact-id']]);
 233
 234                                 //if (!$target_item['private'] && $target_item['wall'] &&
 235                                 if (!$target_item['private'] &&
 236                                         (strlen($target_item['allow_cid'].$target_item['allow_gid'].
 237                                                 $target_item['deny_cid'].$target_item['deny_gid']) == 0))
 238                                         $push_notify = true;
 239
 240                                 if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 241                                         $push_notify = true;
 242
 243                                         if ($parent["network"] == Protocol::OSTATUS) {
 244                                                 // Distribute the message to the DFRN contacts as if this wasn't a followup since OStatus can't relay comments
 245                                                 // Currently it is work at progress
 246                                                 $condition = ['uid' => $uid, 'network' => Protocol::DFRN, 'blocked' => false, 'pending' => false, 'archive' => false];
 247                                                 $followup_contacts_stmt = DBA::select('contact', ['id'], $condition);
 248                                                 while($followup_contact = DBA::fetch($followup_contacts_stmt)) {
 249                                                         $recipients_followup[] = $followup_contact['id'];
 250                                                 }
 251                                                 DBA::close($followup_contacts_stmt);
 252                                         }
 253                                 }
 254
 255                                 if ($direct_forum_delivery) {
 256                                         $push_notify = false;
 257                                 }
 258
 259                                 Logger::log('Notify ' . $target_item["guid"] .' via PuSH: ' . ($push_notify ? "Yes":"No"), Logger::DEBUG);
 260                         } else {
 261                                 $followup = false;
 262
 263                                 Logger::info('Distributing directly', ['target' => $target_id, 'guid' => $target_item['guid']]);
 264
 265                                 // don't send deletions onward for other people's stuff
 266
 267                                 if ($target_item['deleted'] && !intval($target_item['wall'])) {
 268                                         Logger::log('Ignoring delete notification for non-wall item');
 269                                         return;
 270                                 }
 271
 272                                 if (strlen($parent['allow_cid'])
 273                                         || strlen($parent['allow_gid'])
 274                                         || strlen($parent['deny_cid'])
 275                                         || strlen($parent['deny_gid'])) {
 276                                         $public_message = false; // private recipients, not public
 277                                 }
 278
 279                                 $aclFormatter = DI::aclFormatter();
 280
 281                                 $allow_people = $aclFormatter->expand($parent['allow_cid']);
 282                                 $allow_groups = Group::expand($uid, $aclFormatter->expand($parent['allow_gid']),true);
 283                                 $deny_people  = $aclFormatter->expand($parent['deny_cid']);
 284                                 $deny_groups  = Group::expand($uid, $aclFormatter->expand($parent['deny_gid']));
 285
 286                                 // if our parent is a public forum (forum_mode == 1), uplink to the origional author causing
 287                                 // a delivery fork. private groups (forum_mode == 2) do not uplink
 288
 289                                 if ((intval($parent['forum_mode']) == 1) && !$top_level && ($cmd !== Delivery::UPLINK)) {
 290                                         Worker::add($a->queue['priority'], 'Notifier', Delivery::UPLINK, $target_id);
 291                                 }
 292
 293                                 foreach ($items as $item) {
 294                                         $recipients[] = $item['contact-id'];
 295                                         // pull out additional tagged people to notify (if public message)
 296                                         if ($public_message && strlen($item['inform'])) {
 297                                                 $people = explode(',',$item['inform']);
 298                                                 foreach ($people as $person) {
 299                                                         if (substr($person,0,4) === 'cid:') {
 300                                                                 $recipients[] = intval(substr($person,4));
 301                                                         } else {
 302                                                                 $url_recipients[] = substr($person,4);
 303                                                         }
 304                                                 }
 305                                         }
 306                                 }
 307
 308                                 if (count($url_recipients)) {
 309                                         Logger::notice('Deliver', ['target' => $target_id, 'guid' => $target_item['guid'], 'recipients' => $url_recipients]);
 310                                 }
 311
 312                                 $recipients = array_unique(array_merge($recipients, $allow_people, $allow_groups));
 313                                 $deny = array_unique(array_merge($deny_people, $deny_groups));
 314                                 $recipients = array_diff($recipients, $deny);
 315
 316                                 // If this is a public message and pubmail is set on the parent, include all your email contacts
 317                                 if (
 318                                         function_exists('imap_open')
 319                                         && !DI::config()->get('system','imap_disabled')
 320                                         && $public_message
 321                                         && intval($target_item['pubmail'])
 322                                 ) {
 323                                         $mail_contacts_stmt = DBA::select('contact', ['id'], ['uid' => $uid, 'network' => Protocol::MAIL]);
 324                                         while ($mail_contact = DBA::fetch($mail_contacts_stmt)) {
 325                                                 $recipients[] = $mail_contact['id'];
 326                                         }
 327                                         DBA::close($mail_contacts_stmt);
 328                                 }
 329                         }
 330
 331                         // If the thread parent is OStatus then do some magic to distribute the messages.
 332                         // We have not only to look at the parent, since it could be a Friendica thread.
 333                         if (($thr_parent && ($thr_parent['network'] == Protocol::OSTATUS)) || ($parent['network'] == Protocol::OSTATUS)) {
 334                                 $diaspora_delivery = false;
 335
 336                                 Logger::log('Some parent is OStatus for '.$target_item["guid"]." - Author: ".$thr_parent['author-id']." - Owner: ".$thr_parent['owner-id'], Logger::DEBUG);
 337
 338                                 // Send a salmon to the parent author
 339                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['author-id']]);
 340                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 341                                         Logger::log('Notify parent author '.$probed_contact["url"].': '.$probed_contact["notify"]);
 342                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 343                                 }
 344
 345                                 // Send a salmon to the parent owner
 346                                 $probed_contact = DBA::selectFirst('contact', ['url', 'notify'], ['id' => $thr_parent['owner-id']]);
 347                                 if (DBA::isResult($probed_contact) && !empty($probed_contact["notify"])) {
 348                                         Logger::log('Notify parent owner '.$probed_contact["url"].': '.$probed_contact["notify"]);
 349                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 350                                 }
 351
 352                                 // Send a salmon notification to every person we mentioned in the post
 353                                 $arr = explode(',',$target_item['tag']);
 354                                 foreach ($arr as $x) {
 355                                         //Logger::log('Checking tag '.$x, Logger::DEBUG);
 356                                         $matches = null;
 357                                         if (preg_match('/@\[url=([^\]]*)\]/',$x,$matches)) {
 358                                                         $probed_contact = Probe::uri($matches[1]);
 359                                                 if ($probed_contact["notify"] != "") {
 360                                                         Logger::log('Notify mentioned user '.$probed_contact["url"].': '.$probed_contact["notify"]);
 361                                                         $url_recipients[$probed_contact["notify"]] = $probed_contact["notify"];
 362                                                 }
 363                                         }
 364                                 }
 365
 366                                 // It only makes sense to distribute answers to OStatus messages to Friendica and OStatus - but not Diaspora
 367                                 $networks = [Protocol::DFRN];
 368                         } elseif ($diaspora_delivery) {
 369                                 $networks = [Protocol::DFRN, Protocol::DIASPORA, Protocol::MAIL];
 370                                 if (($parent['network'] == Protocol::DIASPORA) || ($thr_parent['network'] == Protocol::DIASPORA)) {
 371                                         Logger::info('Add AP contacts', ['target' => $target_id, 'guid' => $target_item['guid']]);
 372                                         $networks[] = Protocol::ACTIVITYPUB;
 373                                 }
 374                         } else {
 375                                 $networks = [Protocol::DFRN, Protocol::MAIL];
 376                         }
 377                 } else {
 378                         $public_message = false;
 379                 }
 380
 381                 if (empty($delivery_contacts_stmt)) {
 382                         if ($followup) {
 383                                 $recipients = $recipients_followup;
 384                         }
 385                         $condition = ['id' => $recipients, 'self' => false,
 386                                 'blocked' => false, 'pending' => false, 'archive' => false];
 387                         if (!empty($networks)) {
 388                                 $condition['network'] = $networks;
 389                         }
 390                         $delivery_contacts_stmt = DBA::select('contact', ['id', 'addr', 'url', 'network', 'protocol', 'batch'], $condition);
 391                 }
 392
 393                 $conversants = [];
 394                 $batch_delivery = false;
 395
 396                 if ($public_message && !in_array($cmd, [Delivery::MAIL, Delivery::SUGGESTION]) && !$followup) {
 397                         $relay_list = [];
 398
 399                         if ($diaspora_delivery) {
 400                                 $batch_delivery = true;
 401
 402                                 $relay_list_stmt = DBA::p(
 403                                         "SELECT
 404                                                 `batch`,
 405                                                 ANY_VALUE(`id`) AS `id`,
 406                                                 ANY_VALUE(`url`) AS `url`,
 407                                                 ANY_VALUE(`name`) AS `name`,
 408                                                 ANY_VALUE(`network`) AS `network`,
 409                                                 ANY_VALUE(`protocol`) AS `protocol`
 410                                         FROM `contact`
 411                                         WHERE `network` = ?
 412                                         AND `batch` != ''
 413                                         AND `uid` = ?
 414                                         AND `rel` != ?
 415                                         AND NOT `blocked`
 416                                         AND NOT `pending`
 417                                         AND NOT `archive`
 418                                         GROUP BY `batch`",
 419                                         Protocol::DIASPORA,
 420                                         $owner['uid'],
 421                                         Contact::SHARING
 422                                 );
 423                                 $relay_list = DBA::toArray($relay_list_stmt);
 424
 425                                 // Fetch the participation list
 426                                 // The function will ensure that there are no duplicates
 427                                 $relay_list = Diaspora::participantsForThread($target_id, $relay_list);
 428
 429                                 // Add the relay to the list, avoid duplicates.
 430                                 // Don't send community posts to the relay. Forum posts via the Diaspora protocol are looking ugly.
 431                                 if (!$followup && !Item::isForumPost($target_item, $owner)) {
 432                                         $relay_list = Diaspora::relayList($target_id, $relay_list);
 433                                 }
 434                         }
 435
 436                         $condition = ['network' => Protocol::DFRN, 'uid' => $owner['uid'], 'blocked' => false,
 437                                 'pending' => false, 'archive' => false, 'rel' => [Contact::FOLLOWER, Contact::FRIEND]];
 438
 439                         $r2 = DBA::toArray(DBA::select('contact', ['id', 'url', 'addr', 'name', 'network', 'protocol'], $condition));
 440
 441                         $r = array_merge($r2, $relay_list);
 442
 443                         if (DBA::isResult($r)) {
 444                                 foreach ($r as $rr) {
 445                                         // Ensure that local contacts are delivered via DFRN
 446                                         if (Contact::isLocal($rr['url'])) {
 447                                                 $contact['network'] = Protocol::DFRN;
 448                                         }
 449
 450                                         if (!empty($rr['addr']) && ($rr['network'] == Protocol::ACTIVITYPUB) && !DBA::exists('fcontact', ['addr' => $rr['addr']])) {
 451                                                 Logger::info('Contact is AP omly', ['target' => $target_id, 'contact' => $rr['url']]);
 452                                                 continue;
 453                                         }
 454
 455                                         if (!empty($rr['id']) && Contact::isArchived($rr['id'])) {
 456                                                 Logger::info('Contact is archived', ['target' => $target_id, 'contact' => $rr['url']]);
 457                                                 continue;
 458                                         }
 459
 460                                         if (self::isRemovalActivity($cmd, $owner, $rr['network'])) {
 461                                                 Logger::log('Skipping dropping for ' . $rr['url'] . ' since the network supports account removal commands.', Logger::DEBUG);
 462                                                 continue;
 463                                         }
 464
 465                                         if (self::skipDFRN($rr, $target_item, $parent, $thr_parent, $cmd)) {
 466                                                 Logger::info('Contact can be delivered via AP, so skip delivery via legacy DFRN/Diaspora', ['id' => $target_id, 'url' => $rr['url']]);
 467                                                 continue;
 468                                         }
 469
 470                                         $conversants[] = $rr['id'];
 471
 472                                         Logger::info('Public delivery', ['target' => $target_id, 'guid' => $target_item["guid"], 'to' => $rr]);
 473
 474                                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 475                                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 476                                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 477                                         // This is only important for high and medium priority tasks and not for Low priority jobs like deletions.
 478                                         if (($rr['network'] == Protocol::DIASPORA) && in_array($a->queue['priority'], [PRIORITY_HIGH, PRIORITY_MEDIUM])) {
 479                                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 480                                         } else {
 481                                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 482                                         }
 483
 484                                         if (Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$rr['id'])) {
 485                                                 $delivery_queue_count++;
 486                                         }
 487                                 }
 488                         }
 489
 490                         $push_notify = true;
 491                 }
 492
 493                 // delivery loop
 494                 while ($contact = DBA::fetch($delivery_contacts_stmt)) {
 495                         // Ensure that local contacts are delivered via DFRN
 496                         if (Contact::isLocal($contact['url'])) {
 497                                 $contact['network'] = Protocol::DFRN;
 498                         }
 499
 500                         if (!empty($contact['addr']) && ($contact['network'] == Protocol::ACTIVITYPUB) && !DBA::exists('fcontact', ['addr' => $contact['addr']])) {
 501                                 Logger::info('Contact is AP omly', ['target' => $target_id, 'contact' => $contact['url']]);
 502                                 continue;
 503                         }
 504
 505                         if (!empty($contact['id']) && Contact::isArchived($contact['id'])) {
 506                                 Logger::info('Contact is archived', ['target' => $target_id, 'contact' => $contact['url']]);
 507                                 continue;
 508                         }
 509
 510                         if (self::isRemovalActivity($cmd, $owner, $contact['network'])) {
 511                                 Logger::log('Skipping dropping for ' . $contact['url'] . ' since the network supports account removal commands.', Logger::DEBUG);
 512                                 continue;
 513                         }
 514
 515                         if (self::skipDFRN($contact, $target_item, $parent, $thr_parent, $cmd)) {
 516                                 Logger::info('Contact can be delivered via AP, so skip delivery via legacy DFRN/Diaspora', ['target' => $target_id, 'url' => $contact['url']]);
 517                                 continue;
 518                         }
 519
 520                         // Don't deliver to Diaspora if it already had been done as batch delivery
 521                         if (($contact['network'] == Protocol::DIASPORA) && $batch_delivery) {
 522                                 Logger::log('Already delivered  id ' . $target_id . ' via batch to ' . json_encode($contact), Logger::DEBUG);
 523                                 continue;
 524                         }
 525
 526                         // Don't deliver to folks who have already been delivered to
 527                         if (in_array($contact['id'], $conversants)) {
 528                                 Logger::log('Already delivered id ' . $target_id. ' to ' . json_encode($contact), Logger::DEBUG);
 529                                 continue;
 530                         }
 531
 532                         Logger::info('Delivery', ['id' => $target_id, 'to' => $contact]);
 533
 534                         // Ensure that posts with our own protocol arrives before Diaspora posts arrive.
 535                         // Situation is that sometimes Friendica servers receive Friendica posts over the Diaspora protocol first.
 536                         // The conversion in Markdown reduces the formatting, so these posts should arrive after the Friendica posts.
 537                         if ($contact['network'] == Protocol::DIASPORA) {
 538                                 $deliver_options = ['priority' => $a->queue['priority'], 'dont_fork' => true];
 539                         } else {
 540                                 $deliver_options = ['priority' => $a->queue['priority'], 'created' => $a->queue['created'], 'dont_fork' => true];
 541                         }
 542
 543                         if (Worker::add($deliver_options, 'Delivery', $cmd, $target_id, (int)$contact['id'])) {
 544                                 $delivery_queue_count++;
 545                         }
 546                 }
 547                 DBA::close($delivery_contacts_stmt);
 548
 549                 $url_recipients = array_filter($url_recipients);
 550                 // send salmon slaps to mentioned remote tags (@foo@example.com) in OStatus posts
 551                 // They are especially used for notifications to OStatus users that don't follow us.
 552                 if (!DI::config()->get('system', 'dfrn_only') && count($url_recipients) && ($public_message || $push_notify) && !empty($target_item)) {
 553                         $slap = OStatus::salmon($target_item, $owner);
 554                         foreach ($url_recipients as $url) {
 555                                 Logger::log('Salmon delivery of item ' . $target_id . ' to ' . $url);
 556                                 /// @TODO Redeliver/queue these items on failure, though there is no contact record
 557                                 $delivery_queue_count++;
 558                                 Salmon::slapper($owner, $url, $slap);
 559                                 ItemDeliveryData::incrementQueueDone($target_id, ItemDeliveryData::OSTATUS);
 560                         }
 561                 }
 562
 563                 // Notify PuSH subscribers (Used for OStatus distribution of regular posts)
 564                 if ($push_notify) {
 565                         Logger::log('Activating internal PuSH for item '.$target_id, Logger::DEBUG);
 566
 567                         // Handling the pubsubhubbub requests
 568                         PushSubscriber::publishFeed($owner['uid'], $a->queue['priority']);
 569                 }
 570
 571                 if (!empty($target_item)) {
 572                         Logger::log('Calling hooks for ' . $cmd . ' ' . $target_id, Logger::DEBUG);
 573
 574                         Hook::fork($a->queue['priority'], 'notifier_normal', $target_item);
 575
 576                         Hook::callAll('notifier_end', $target_item);
 577
 578                         // Workaround for pure connector posts
 579                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 580                                 if ($delivery_queue_count == 0) {
 581                                         ItemDeliveryData::incrementQueueDone($target_item['id']);
 582                                         $delivery_queue_count = 1;
 583                                 }
 584
 585                                 ItemDeliveryData::incrementQueueCount($target_item['id'], $delivery_queue_count);
 586                         }
 587                 }
 588
 589                 return;
 590         }
 591
 592         /**
 593          * Checks if the current delivery process needs to be transported via DFRN.
 594          *
 595          * @param array  $contact    Receiver of the post
 596          * @param array  $item       The post
 597          * @param array  $parent     The parent
 598          * @param array  $thr_parent The thread parent
 599          * @param string $cmd        Notifier command
 600          * @return bool
 601          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 602          * @throws \ImagickException
 603          */
 604         private static function skipDFRN($contact, $item, $parent, $thr_parent, $cmd)
 605         {
 606                 if (empty($parent['network'])) {
 607                         return false;
 608                 }
 609
 610                 // Don't skip when the starting post is delivered via Diaspora
 611                 if ($parent['network'] == Protocol::DIASPORA) {
 612                         return false;
 613                 }
 614
 615                 // Also don't skip when the direct thread parent was delivered via Diaspora
 616                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 617                         return false;
 618                 }
 619
 620                 // Use DFRN if we are on the same site
 621                 if (!empty($contact['url']) && Contact::isLocal($contact['url'])) {
 622                         return false;
 623                 }
 624
 625                 // Don't skip when author or owner don't have AP profiles
 626                 if ((!empty($item['author-link']) && empty(APContact::getByURL($item['author-link'], false))) || (!empty($item['owner-link']) && empty(APContact::getByURL($item['owner-link'], false)))) {
 627                         return false;
 628                 }
 629
 630                 // Don't skip DFRN delivery for these commands
 631                 if (in_array($cmd, [Delivery::SUGGESTION, Delivery::REMOVAL, Delivery::RELOCATION, Delivery::POKE])) {
 632                         return false;
 633                 }
 634
 635                 // We deliver reshares via AP whenever possible
 636                 if (ActivityPub\Transmitter::isAnnounce($item)) {
 637                         return true;
 638                 }
 639
 640                 // Skip DFRN when the item will be (forcefully) delivered via AP
 641                 if (DI::config()->get('debug', 'total_ap_delivery') && ($contact['network'] == Protocol::DFRN) && !empty(APContact::getByURL($contact['url'], false))) {
 642                         return true;
 643                 }
 644
 645                 // Skip DFRN delivery if the contact speaks ActivityPub
 646                 return in_array($contact['network'], [Protocol::DFRN, Protocol::DIASPORA]) && ($contact['protocol'] == Protocol::ACTIVITYPUB);
 647         }
 648
 649         /**
 650          * Checks if the current action is a deletion command of a account removal activity
 651          * For Diaspora and ActivityPub we don't need to send single item deletion calls.
 652          * These protocols do have a dedicated command for deleting a whole account.
 653          *
 654          * @param string $cmd     Notifier command
 655          * @param array  $owner   Sender of the post
 656          * @param string $network Receiver network
 657          * @return bool
 658          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 659          * @throws \ImagickException
 660          */
 661         private static function isRemovalActivity($cmd, $owner, $network)
 662         {
 663                 return ($cmd == Delivery::DELETION) && $owner['account_removed'] && in_array($network, [Protocol::ACTIVITYPUB, Protocol::DIASPORA]);
 664         }
 665
 666         /**
 667          * @param int    $self_user_id
 668          * @param int    $priority The priority the Notifier queue item was created with
 669          * @param string $created  The date the Notifier queue item was created on
 670          * @return bool
 671          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 672          * @throws \ImagickException
 673          */
 674         private static function notifySelfRemoval($self_user_id, $priority, $created)
 675         {
 676                 $owner = User::getOwnerDataById($self_user_id);
 677                 if (!$owner) {
 678                         return false;
 679                 }
 680
 681                 $contacts_stmt = DBA::select('contact', [], ['self' => false, 'uid' => $self_user_id]);
 682                 if (!DBA::isResult($contacts_stmt)) {
 683                         return false;
 684                 }
 685
 686                 while($contact = DBA::fetch($contacts_stmt)) {
 687                         Contact::terminateFriendship($owner, $contact, true);
 688                 }
 689                 DBA::close($contacts_stmt);
 690
 691                 $inboxes = ActivityPub\Transmitter::fetchTargetInboxesforUser(0);
 692                 foreach ($inboxes as $inbox) {
 693                         Logger::info('Account removal via ActivityPub', ['uid' => $self_user_id, 'inbox' => $inbox]);
 694                         Worker::add(['priority' => PRIORITY_NEGLIGIBLE, 'created' => $created, 'dont_fork' => true],
 695                                 'APDelivery', Delivery::REMOVAL, '', $inbox, $self_user_id);
 696                 }
 697
 698                 return true;
 699         }
 700
 701         /**
 702          * @param string $cmd
 703          * @param array  $target_item
 704          * @param array  $parent
 705          * @param array  $thr_parent
 706          * @param int    $priority The priority the Notifier queue item was created with
 707          * @param string $created  The date the Notifier queue item was created on
 708          * @return int The number of delivery tasks created
 709          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 710          * @throws \ImagickException
 711          */
 712         private static function activityPubDelivery($cmd, array $target_item, array $parent, array $thr_parent, $priority, $created, $owner)
 713         {
 714                 // Don't deliver via AP when the starting post is delivered via Diaspora
 715                 if ($parent['network'] == Protocol::DIASPORA) {
 716                         return 0;
 717                 }
 718
 719                 // Also don't deliver  when the direct thread parent was delivered via Diaspora
 720                 if ($thr_parent['network'] == Protocol::DIASPORA) {
 721                         return 0;
 722                 }
 723
 724                 $inboxes = [];
 725
 726                 $uid = $target_item['contact-uid'] ?: $target_item['uid'];
 727
 728                 if ($target_item['origin']) {
 729                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid);
 730                         Logger::log('Origin item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 731                 } elseif (Item::isForumPost($target_item, $owner)) {
 732                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($target_item, $uid, false, 0, true);
 733                         Logger::log('Forum item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 734                 } elseif (!DBA::exists('conversation', ['item-uri' => $target_item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB])) {
 735                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' is no AP post. It will not be distributed.', Logger::DEBUG);
 736                         return 0;
 737                 } elseif ($parent['origin']) {
 738                         // Remote items are transmitted via the personal inboxes.
 739                         // Doing so ensures that the dedicated receiver will get the message.
 740                         $inboxes = ActivityPub\Transmitter::fetchTargetInboxes($parent, $uid, true, $target_item['id']);
 741                         Logger::log('Remote item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . ' will be distributed.', Logger::DEBUG);
 742                 }
 743
 744                 if (empty($inboxes)) {
 745                         Logger::log('No inboxes found for item ' . $target_item['id'] . ' with URL ' . $target_item['uri'] . '. It will not be distributed.', Logger::DEBUG);
 746                         return 0;
 747                 }
 748
 749                 // Fill the item cache
 750                 ActivityPub\Transmitter::createCachedActivityFromItem($target_item['id'], true);
 751
 752                 $delivery_queue_count = 0;
 753
 754                 foreach ($inboxes as $inbox) {
 755                         Logger::info('Delivery via ActivityPub', ['cmd' => $cmd, 'id' => $target_item['id'], 'inbox' => $inbox]);
 756
 757                         if (Worker::add(['priority' => $priority, 'created' => $created, 'dont_fork' => true],
 758                                         'APDelivery', $cmd, $target_item['id'], $inbox, $uid)) {
 759                                 $delivery_queue_count++;
 760                         }
 761                 }
 762
 763                 return $delivery_queue_count;
 764         }
 765 }