src/Worker/Delivery.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   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\Logger;
  25 use Friendica\Core\Protocol;
  26 use Friendica\Database\DBA;
  27 use Friendica\DI;
  28 use Friendica\Model;
  29 use Friendica\Protocol\DFRN;
  30 use Friendica\Protocol\Diaspora;
  31 use Friendica\Protocol\Email;
  32 use Friendica\Protocol\Activity;
  33 use Friendica\Util\Network;
  34 use Friendica\Core\Worker;
  35 use Friendica\Model\Conversation;
  36 use Friendica\Model\FContact;
  37 use Friendica\Model\Item;
  38 use Friendica\Protocol\Relay;
  39
  40 class Delivery
  41 {
  42         const MAIL          = 'mail';
  43         const SUGGESTION    = 'suggest';
  44         const RELOCATION    = 'relocate';
  45         const DELETION      = 'drop';
  46         const POST          = 'wall-new';
  47         const POKE          = 'poke';
  48         const UPLINK        = 'uplink';
  49         const REMOVAL       = 'removeme';
  50         const PROFILEUPDATE = 'profileupdate';
  51
  52         public static function execute(string $cmd, int $post_uriid, int $contact_id, int $sender_uid = 0)
  53         {
  54                 Logger::info('Invoked', ['cmd' => $cmd, 'target' => $post_uriid, 'sender_uid' => $sender_uid, 'contact' => $contact_id]);
  55
  56                 $top_level = false;
  57                 $followup = false;
  58                 $public_message = false;
  59
  60                 $items = [];
  61                 if ($cmd == self::MAIL) {
  62                         $target_item = DBA::selectFirst('mail', [], ['id' => $post_uriid]);
  63                         if (!DBA::isResult($target_item)) {
  64                                 return;
  65                         }
  66                         $uid = $target_item['uid'];
  67                 } elseif ($cmd == self::SUGGESTION) {
  68                         $target_item = DBA::selectFirst('fsuggest', [], ['id' => $post_uriid]);
  69                         if (!DBA::isResult($target_item)) {
  70                                 return;
  71                         }
  72                         $uid = $target_item['uid'];
  73                 } elseif ($cmd == self::RELOCATION) {
  74                         $uid = $post_uriid;
  75                         $target_item = [];
  76                 } else {
  77                         $item = Model\Post::selectFirst(['id', 'parent'], ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  78                         if (!DBA::isResult($item) || empty($item['parent'])) {
  79                                 Logger::warning('Post not found', ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  80                                 return;
  81                         }
  82                         $target_id = intval($item['id']);
  83                         $parent_id = intval($item['parent']);
  84
  85                         $condition = ['id' => [$target_id, $parent_id], 'visible' => true];
  86                         $params = ['order' => ['id']];
  87                         $itemdata = Model\Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
  88
  89                         while ($item = Model\Post::fetch($itemdata)) {
  90                                 if ($item['verb'] == Activity::ANNOUNCE) {
  91                                         continue;
  92                                 }
  93
  94                                 if ($item['id'] == $parent_id) {
  95                                         $parent = $item;
  96                                 }
  97                                 if ($item['id'] == $target_id) {
  98                                         $target_item = $item;
  99                                 }
 100                                 $items[] = $item;
 101                         }
 102                         DBA::close($itemdata);
 103
 104                         if (empty($target_item)) {
 105                                 Logger::log('Item ' . $target_id . "wasn't found. Quitting here.");
 106                                 return;
 107                         }
 108
 109                         if (empty($parent)) {
 110                                 Logger::log('Parent ' . $parent_id . ' for item ' . $target_id . "wasn't found. Quitting here.");
 111                                 self::setFailedQueue($cmd, $target_item);
 112                                 return;
 113                         }
 114
 115                         if (!empty($target_item['contact-uid'])) {
 116                                 $uid = $target_item['contact-uid'];
 117                         } elseif (!empty($target_item['uid'])) {
 118                                 $uid = $target_item['uid'];
 119                         } else {
 120                                 Logger::log('Only public users for item ' . $target_id, Logger::DEBUG);
 121                                 self::setFailedQueue($cmd, $target_item);
 122                                 return;
 123                         }
 124
 125                         $condition = ['uri' => $target_item['thr-parent'], 'uid' => $target_item['uid']];
 126                         $thr_parent = Model\Post::selectFirst(['network', 'object'], $condition);
 127                         if (!DBA::isResult($thr_parent)) {
 128                                 // Shouldn't happen. But when this does, we just take the parent as thread parent.
 129                                 // That's totally okay for what we use this variable here.
 130                                 $thr_parent = $parent;
 131                         }
 132
 133                         if (!empty($contact_id) && Model\Contact::isArchived($contact_id)) {
 134                                 Logger::info('Contact is archived', ['id' => $contact_id, 'cmd' => $cmd, 'item' => $target_item['id']]);
 135                                 self::setFailedQueue($cmd, $target_item);
 136                                 return;
 137                         }
 138
 139                         // avoid race condition with deleting entries
 140                         if ($items[0]['deleted']) {
 141                                 foreach ($items as $item) {
 142                                         $item['deleted'] = 1;
 143                                 }
 144                         }
 145
 146                         $top_level = $target_item['gravity'] == GRAVITY_PARENT;
 147
 148                         // This is IMPORTANT!!!!
 149
 150                         // We will only send a "notify owner to relay" or followup message if the referenced post
 151                         // originated on our system by virtue of having our hostname somewhere
 152                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 153                         // if $parent['wall'] == 1 we will already have the parent message in our array
 154                         // and we will relay the whole lot.
 155
 156                         $localhost = DI::baseUrl()->getHostname();
 157                         if (strpos($localhost, ':')) {
 158                                 $localhost = substr($localhost, 0, strpos($localhost, ':'));
 159                         }
 160                         /**
 161                          *
 162                          * Be VERY CAREFUL if you make any changes to the following line. Seemingly innocuous changes
 163                          * have been known to cause runaway conditions which affected several servers, along with
 164                          * permissions issues.
 165                          *
 166                          */
 167
 168                         if (!$top_level && ($parent['wall'] == 0) && stristr($target_item['uri'], $localhost)) {
 169                                 Logger::log('Followup ' . $target_item["guid"], Logger::DEBUG);
 170                                 // local followup to remote post
 171                                 $followup = true;
 172                         }
 173
 174                         if (empty($parent['allow_cid'])
 175                                 && empty($parent['allow_gid'])
 176                                 && empty($parent['deny_cid'])
 177                                 && empty($parent['deny_gid'])
 178                                 && ($parent["private"] != Model\Item::PRIVATE)) {
 179                                 $public_message = true;
 180                         }
 181                 }
 182
 183                 if (empty($items)) {
 184                         Logger::notice('No delivery data', ['command' => $cmd, 'uri-id' => $post_uriid, 'cid' => $contact_id]);
 185                 }
 186
 187                 $owner = Model\User::getOwnerDataById($uid);
 188                 if (!DBA::isResult($owner)) {
 189                         self::setFailedQueue($cmd, $target_item);
 190                         return;
 191                 }
 192
 193                 // We don't deliver our items to blocked, archived or pending contacts, and not to ourselves either
 194                 $contact = DBA::selectFirst('contact', [],
 195                         ['id' => $contact_id, 'archive' => false, 'blocked' => false, 'pending' => false, 'self' => false]
 196                 );
 197                 if (!DBA::isResult($contact)) {
 198                         self::setFailedQueue($cmd, $target_item);
 199                         return;
 200                 }
 201
 202                 if (Network::isUrlBlocked($contact['url'])) {
 203                         self::setFailedQueue($cmd, $target_item);
 204                         return;
 205                 }
 206
 207                 $protocol = Model\GServer::getProtocol($contact['gsid'] ?? 0);
 208
 209                 // Transmit via Diaspora if the thread had started as Diaspora post.
 210                 // Also transmit via Diaspora if this is a direct answer to a Diaspora comment.
 211                 // This is done since the uri wouldn't match (Diaspora doesn't transmit it)
 212                 // Also transmit relayed posts from Diaspora contacts via Diaspora.
 213                 if (!empty($parent) && !empty($thr_parent) && in_array(Protocol::DIASPORA, [$parent['network'], $thr_parent['network'], $target_item['network']])) {
 214                         $contact['network'] = Protocol::DIASPORA;
 215                 }
 216
 217                 Logger::notice('Delivering', ['cmd' => $cmd, 'uri-id' => $post_uriid, 'followup' => $followup, 'network' => $contact['network']]);
 218
 219                 switch ($contact['network']) {
 220                         case Protocol::DFRN:
 221                                 self::deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $protocol);
 222                                 break;
 223
 224                         case Protocol::DIASPORA:
 225                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 226                                 break;
 227
 228                         case Protocol::MAIL:
 229                                 self::deliverMail($cmd, $contact, $owner, $target_item, $thr_parent);
 230                                 break;
 231
 232                         default:
 233                                 break;
 234                 }
 235
 236                 return;
 237         }
 238
 239         /**
 240          * Increased the "failed" counter in the item delivery data
 241          *
 242          * @param string $cmd  Command
 243          * @param array  $item Item array
 244          */
 245         private static function setFailedQueue(string $cmd, array $item)
 246         {
 247                 if (!in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 248                         return;
 249                 }
 250
 251                 Model\Post\DeliveryData::incrementQueueFailed($item['uri-id'] ?? $item['id']);
 252         }
 253
 254         /**
 255          * Deliver content via DFRN
 256          *
 257          * @param string  $cmd             Command
 258          * @param array   $contact         Contact record of the receiver
 259          * @param array   $owner           Owner record of the sender
 260          * @param array   $items           Item record of the content and the parent
 261          * @param array   $target_item     Item record of the content
 262          * @param boolean $public_message  Is the content public?
 263          * @param boolean $top_level       Is it a thread starter?
 264          * @param boolean $followup        Is it an answer to a remote post?
 265          * @param int     $server_protocol The protocol of the server
 266          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 267          * @throws \ImagickException
 268          */
 269         private static function deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $server_protocol)
 270         {
 271                 // Transmit Diaspora reshares via Diaspora if the Friendica contact support Diaspora
 272                 if (Diaspora::isReshare($target_item['body']) && !empty(FContact::getByURL($contact['addr'], false))) {
 273                         Logger::info('Reshare will be transmitted via Diaspora', ['url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 274                         self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 275                         return;
 276                 }
 277
 278                 Logger::info('Deliver ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' via DFRN to ' . (($contact['addr'] ?? '') ?: $contact['url']));
 279
 280                 if ($cmd == self::MAIL) {
 281                         $item = $target_item;
 282                         $item['body'] = Model\Item::fixPrivatePhotos($item['body'], $owner['uid'], null, $item['contact-id']);
 283                         $atom = DFRN::mail($item, $owner);
 284                 } elseif ($cmd == self::SUGGESTION) {
 285                         $item = $target_item;
 286                         $atom = DFRN::fsuggest($item, $owner);
 287                         DBA::delete('fsuggest', ['id' => $item['id']]);
 288                 } elseif ($cmd == self::RELOCATION) {
 289                         $atom = DFRN::relocate($owner, $owner['uid']);
 290                 } elseif ($followup) {
 291                         $msgitems = [$target_item];
 292                         $atom = DFRN::entries($msgitems, $owner);
 293                 } else {
 294                         if ($target_item['deleted']) {
 295                                 $msgitems = [$target_item];
 296                         } else {
 297                                 $msgitems = [];
 298                                 foreach ($items as $item) {
 299                                         // Only add the parent when we don't delete other items.
 300                                         if (($target_item['id'] == $item['id']) || ($cmd != self::DELETION)) {
 301                                                 $item["entry:comment-allow"] = true;
 302                                                 $item["entry:cid"] = ($top_level ? $contact['id'] : 0);
 303                                                 $msgitems[] = $item;
 304                                         }
 305                                 }
 306                         }
 307                         $atom = DFRN::entries($msgitems, $owner);
 308                 }
 309
 310                 Logger::debug('Notifier entry: ' . $contact["url"] . ' ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' entry: ' . $atom);
 311
 312                 $protocol = Model\Post\DeliveryData::DFRN;
 313
 314                 // We don't have a relationship with contacts on a public post.
 315                 // Se we transmit with the new method and via Diaspora as a fallback
 316                 if (!empty($items) && (($items[0]['uid'] == 0) || ($contact['uid'] == 0))) {
 317                         // Transmit in public if it's a relay post
 318                         $public_dfrn = ($contact['contact-type'] == Model\Contact::TYPE_RELAY);
 319
 320                         $deliver_status = DFRN::transmit($owner, $contact, $atom, $public_dfrn);
 321
 322                         // We never spool failed relay deliveries
 323                         if ($public_dfrn) {
 324                                 Logger::info('Relay delivery to ' . $contact["url"] . ' with guid ' . $target_item["guid"] . ' returns ' . $deliver_status);
 325
 326                                 if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 327                                         if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 328                                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 329
 330                                                 Model\GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 331                                         } else {
 332                                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 333                                         }
 334                                 }
 335                                 return;
 336                         }
 337
 338                         if ((($deliver_status < 200) || ($deliver_status > 299)) && (empty($server_protocol) || ($server_protocol == Model\Post\DeliveryData::LEGACY_DFRN))) {
 339                                 // Transmit via Diaspora if not possible via Friendica
 340                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 341                                 return;
 342                         }
 343                 } else {
 344                         // DFRN payload over Diaspora transport layer
 345                         $deliver_status = DFRN::transmit($owner, $contact, $atom);
 346                 }
 347
 348                 Logger::info('DFRN Delivery', ['cmd' => $cmd, 'url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id'], 'return' => $deliver_status]);
 349
 350                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 351                         // We successfully delivered a message, the contact is alive
 352                         Model\Contact::unmarkForArchival($contact);
 353
 354                         Model\GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 355
 356                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 357                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 358                         }
 359                 } else {
 360                         // The message could not be delivered. We mark the contact as "dead"
 361                         Model\Contact::markForArchival($contact);
 362
 363                         Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 364                         if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 365                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 366                         }
 367                 }
 368         }
 369
 370         /**
 371          * Deliver content via Diaspora
 372          *
 373          * @param string  $cmd            Command
 374          * @param array   $contact        Contact record of the receiver
 375          * @param array   $owner          Owner record of the sender
 376          * @param array   $items          Item record of the content and the parent
 377          * @param array   $target_item    Item record of the content
 378          * @param boolean $public_message Is the content public?
 379          * @param boolean $top_level      Is it a thread starter?
 380          * @param boolean $followup       Is it an answer to a remote post?
 381          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 382          * @throws \ImagickException
 383          */
 384         private static function deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup)
 385         {
 386                 // We don't treat Forum posts as "wall-to-wall" to be able to post them via Diaspora
 387                 $walltowall = $top_level && ($owner['id'] != $items[0]['contact-id']) & ($owner['account-type'] != Model\User::ACCOUNT_TYPE_COMMUNITY);
 388
 389                 if ($public_message) {
 390                         $loc = 'public batch ' . $contact['batch'];
 391                 } else {
 392                         $loc = $contact['addr'];
 393                 }
 394
 395                 Logger::notice('Deliver via Diaspora', ['target' => $target_item['id'], 'guid' => $target_item['guid'], 'to' => $loc]);
 396
 397                 if (DI::config()->get('system', 'dfrn_only') || !DI::config()->get('system', 'diaspora_enabled')) {
 398                         return;
 399                 }
 400
 401                 if ($cmd == self::MAIL) {
 402                         Diaspora::sendMail($target_item, $owner, $contact);
 403                         return;
 404                 }
 405
 406                 if ($cmd == self::SUGGESTION) {
 407                         return;
 408                 }
 409
 410                 if (!$contact['pubkey'] && !$public_message) {
 411                         return;
 412                 }
 413
 414                 if ($cmd == self::RELOCATION) {
 415                         $deliver_status = Diaspora::sendAccountMigration($owner, $contact, $owner['uid']);
 416                 } elseif ($target_item['deleted'] && (($target_item['uri'] === $target_item['parent-uri']) || $followup)) {
 417                         // top-level retraction
 418                         Logger::log('diaspora retract: ' . $loc);
 419                         $deliver_status = Diaspora::sendRetraction($target_item, $owner, $contact, $public_message);
 420                 } elseif ($followup) {
 421                         // send comments and likes to owner to relay
 422                         Logger::log('diaspora followup: ' . $loc);
 423                         $deliver_status = Diaspora::sendFollowup($target_item, $owner, $contact, $public_message);
 424                 } elseif ($target_item['uri'] !== $target_item['parent-uri']) {
 425                         // we are the relay - send comments, likes and relayable_retractions to our conversants
 426                         Logger::log('diaspora relay: ' . $loc);
 427                         $deliver_status = Diaspora::sendRelay($target_item, $owner, $contact, $public_message);
 428                 } elseif ($top_level && !$walltowall) {
 429                         // currently no workable solution for sending walltowall
 430                         Logger::log('diaspora status: ' . $loc);
 431                         $deliver_status = Diaspora::sendStatus($target_item, $owner, $contact, $public_message);
 432                 } else {
 433                         Logger::log('Unknown mode ' . $cmd . ' for ' . $loc);
 434                         return;
 435                 }
 436
 437                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 438                         // We successfully delivered a message, the contact is alive
 439                         Model\Contact::unmarkForArchival($contact);
 440
 441                         Model\GServer::setProtocol($contact['gsid'] ?? 0, Model\Post\DeliveryData::DIASPORA);
 442
 443                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 444                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::DIASPORA);
 445                         }
 446                 } else {
 447                         // The message could not be delivered. We mark the contact as "dead"
 448                         Model\Contact::markForArchival($contact);
 449
 450                         // When it is delivered to the public endpoint, we do mark the relay contact for archival as well
 451                         if ($public_message) {
 452                                 Relay::markForArchival($contact);
 453                         }
 454
 455                         if (empty($contact['contact-type']) || ($contact['contact-type'] != Model\Contact::TYPE_RELAY)) {
 456                                 Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 457                                 // defer message for redelivery
 458                                 if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 459                                         Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 460                                 }
 461                         } elseif (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 462                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 463                         }
 464                 }
 465         }
 466
 467         /**
 468          * Deliver content via mail
 469          *
 470          * @param string $cmd         Command
 471          * @param array  $contact     Contact record of the receiver
 472          * @param array  $owner       Owner record of the sender
 473          * @param array  $target_item Item record of the content
 474          * @param array  $thr_parent  Item record of the direct parent in the thread
 475          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 476          * @throws \ImagickException
 477          */
 478         private static function deliverMail($cmd, $contact, $owner, $target_item, $thr_parent)
 479         {
 480                 if (DI::config()->get('system','dfrn_only')) {
 481                         return;
 482                 }
 483
 484                 $addr = $contact['addr'];
 485                 if (!strlen($addr)) {
 486                         return;
 487                 }
 488
 489                 if (!in_array($cmd, [self::POST, self::POKE])) {
 490                         return;
 491                 }
 492
 493                 if ($target_item['verb'] != Activity::POST) {
 494                         return;
 495                 }
 496
 497                 if (!empty($thr_parent['object'])) {
 498                         $data = json_decode($thr_parent['object'], true);
 499                         if (!empty($data['reply_to'])) {
 500                                 $addr = $data['reply_to'][0]['mailbox'] . '@' . $data['reply_to'][0]['host'];
 501                                 Logger::info('Use "reply-to" address of the thread parent', ['addr' => $addr]);
 502                         } elseif (!empty($data['from'])) {
 503                                 $addr = $data['from'][0]['mailbox'] . '@' . $data['from'][0]['host'];
 504                                 Logger::info('Use "from" address of the thread parent', ['addr' => $addr]);
 505                         }
 506                 }
 507
 508                 $local_user = DBA::selectFirst('user', [], ['uid' => $owner['uid']]);
 509                 if (!DBA::isResult($local_user)) {
 510                         return;
 511                 }
 512
 513                 Logger::info('About to deliver via mail', ['guid' => $target_item['guid'], 'to' => $addr]);
 514
 515                 $reply_to = '';
 516                 $mailacct = DBA::selectFirst('mailacct', ['reply_to'], ['uid' => $owner['uid']]);
 517                 if (DBA::isResult($mailacct) && !empty($mailacct['reply_to'])) {
 518                         $reply_to = $mailacct['reply_to'];
 519                 }
 520
 521                 $subject  = ($target_item['title'] ? Email::encodeHeader($target_item['title'], 'UTF-8') : DI::l10n()->t("\x28no subject\x29"));
 522
 523                 // only expose our real email address to true friends
 524
 525                 if (($contact['rel'] == Model\Contact::FRIEND) && !$contact['blocked']) {
 526                         if ($reply_to) {
 527                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $reply_to . '>' . "\n";
 528                                 $headers .= 'Sender: ' . $local_user['email'] . "\n";
 529                         } else {
 530                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $local_user['email'] . '>' . "\n";
 531                         }
 532                 } else {
 533                         $sender = DI::config()->get('config', 'sender_email', 'noreply@' . DI::baseUrl()->getHostname());
 534                         $headers  = 'From: '. Email::encodeHeader($local_user['username'], 'UTF-8') . ' <' . $sender . '>' . "\n";
 535                 }
 536
 537                 $headers .= 'Message-Id: <' . Email::iri2msgid($target_item['uri']) . '>' . "\n";
 538
 539                 if ($target_item['uri'] !== $target_item['parent-uri']) {
 540                         $headers .= 'References: <' . Email::iri2msgid($target_item['parent-uri']) . '>';
 541
 542                         // Export more references on deeper nested threads
 543                         if (($target_item['thr-parent'] != '') && ($target_item['thr-parent'] != $target_item['parent-uri'])) {
 544                                 $headers .= ' <' . Email::iri2msgid($target_item['thr-parent']) . '>';
 545                         }
 546
 547                         $headers .= "\n";
 548
 549                         if (empty($target_item['title'])) {
 550                                 $condition = ['uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 551                                 $title = Model\Post::selectFirst(['title'], $condition);
 552
 553                                 if (DBA::isResult($title) && ($title['title'] != '')) {
 554                                         $subject = $title['title'];
 555                                 } else {
 556                                         $condition = ['parent-uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 557                                         $title = Model\Post::selectFirst(['title'], $condition);
 558
 559                                         if (DBA::isResult($title) && ($title['title'] != '')) {
 560                                                 $subject = $title['title'];
 561                                         }
 562                                 }
 563                         }
 564
 565                         if (strncasecmp($subject, 'RE:', 3)) {
 566                                 $subject = 'Re: ' . $subject;
 567                         }
 568                 }
 569
 570                 Email::send($addr, $subject, $headers, $target_item);
 571
 572                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::MAIL);
 573
 574                 Logger::info('Delivered via mail', ['guid' => $target_item['guid'], 'to' => $addr, 'subject' => $subject]);
 575         }
 576 }