src/Worker/Delivery.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, 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\Contact\FriendSuggest\Collection\FriendSuggests;
  25 use Friendica\Contact\FriendSuggest\Exception\FriendSuggestNotFoundException;
  26 use Friendica\Core\Logger;
  27 use Friendica\Core\Protocol;
  28 use Friendica\Database\DBA;
  29 use Friendica\DI;
  30 use Friendica\Model;
  31 use Friendica\Protocol\DFRN;
  32 use Friendica\Protocol\Diaspora;
  33 use Friendica\Protocol\Email;
  34 use Friendica\Protocol\Activity;
  35 use Friendica\Util\Network;
  36 use Friendica\Core\Worker;
  37 use Friendica\Model\FContact;
  38 use Friendica\Model\Item;
  39 use Friendica\Protocol\Relay;
  40
  41 class Delivery
  42 {
  43         const MAIL          = 'mail';
  44         const SUGGESTION    = 'suggest';
  45         const RELOCATION    = 'relocate';
  46         const DELETION      = 'drop';
  47         const POST          = 'wall-new';
  48         const POKE          = 'poke';
  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                         try {
  69                                 $target_item = DI::fsuggest()->selectOneById($post_uriid)->toArray();
  70                         } catch (FriendSuggestNotFoundException $e) {
  71                                 DI::logger()->info('Cannot find FriendSuggestion', ['id' => $post_uriid]);
  72                                 return;
  73                         }
  74                         $uid = $target_item['uid'];
  75                 } elseif ($cmd == self::RELOCATION) {
  76                         $uid = $post_uriid;
  77                         $target_item = [];
  78                 } else {
  79                         $item = Model\Post::selectFirst(['id', 'parent'], ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  80                         if (!DBA::isResult($item) || empty($item['parent'])) {
  81                                 Logger::warning('Post not found', ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  82                                 return;
  83                         }
  84                         $target_id = intval($item['id']);
  85                         $parent_id = intval($item['parent']);
  86
  87                         $condition = ['id' => [$target_id, $parent_id], 'visible' => true];
  88                         $params = ['order' => ['id']];
  89                         $itemdata = Model\Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
  90
  91                         while ($item = Model\Post::fetch($itemdata)) {
  92                                 if ($item['verb'] == Activity::ANNOUNCE) {
  93                                         continue;
  94                                 }
  95
  96                                 if ($item['id'] == $parent_id) {
  97                                         $parent = $item;
  98                                 }
  99                                 if ($item['id'] == $target_id) {
 100                                         $target_item = $item;
 101                                 }
 102                                 $items[] = $item;
 103                         }
 104                         DBA::close($itemdata);
 105
 106                         if (empty($target_item)) {
 107                                 Logger::notice('Item ' . $target_id . "wasn't found. Quitting here.");
 108                                 return;
 109                         }
 110
 111                         if (empty($parent)) {
 112                                 Logger::notice('Parent ' . $parent_id . ' for item ' . $target_id . "wasn't found. Quitting here.");
 113                                 self::setFailedQueue($cmd, $target_item);
 114                                 return;
 115                         }
 116
 117                         if (!empty($target_item['contact-uid'])) {
 118                                 $uid = $target_item['contact-uid'];
 119                         } elseif (!empty($target_item['uid'])) {
 120                                 $uid = $target_item['uid'];
 121                         } else {
 122                                 Logger::info('Only public users for item ' . $target_id);
 123                                 self::setFailedQueue($cmd, $target_item);
 124                                 return;
 125                         }
 126
 127                         $condition = ['uri' => $target_item['thr-parent'], 'uid' => $target_item['uid']];
 128                         $thr_parent = Model\Post::selectFirst(['network', 'object'], $condition);
 129                         if (!DBA::isResult($thr_parent)) {
 130                                 // Shouldn't happen. But when this does, we just take the parent as thread parent.
 131                                 // That's totally okay for what we use this variable here.
 132                                 $thr_parent = $parent;
 133                         }
 134
 135                         if (!empty($contact_id) && Model\Contact::isArchived($contact_id)) {
 136                                 Logger::info('Contact is archived', ['id' => $contact_id, 'cmd' => $cmd, 'item' => $target_item['id']]);
 137                                 self::setFailedQueue($cmd, $target_item);
 138                                 return;
 139                         }
 140
 141                         // avoid race condition with deleting entries
 142                         if ($items[0]['deleted']) {
 143                                 foreach ($items as $item) {
 144                                         $item['deleted'] = 1;
 145                                 }
 146                         }
 147
 148                         $top_level = $target_item['gravity'] == GRAVITY_PARENT;
 149
 150                         // This is IMPORTANT!!!!
 151
 152                         // We will only send a "notify owner to relay" or followup message if the referenced post
 153                         // originated on our system by virtue of having our hostname somewhere
 154                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 155                         // if $parent['wall'] == 1 we will already have the parent message in our array
 156                         // and we will relay the whole lot.
 157
 158                         $localhost = DI::baseUrl()->getHostname();
 159                         if (strpos($localhost, ':')) {
 160                                 $localhost = substr($localhost, 0, strpos($localhost, ':'));
 161                         }
 162                         /**
 163                          *
 164                          * Be VERY CAREFUL if you make any changes to the following line. Seemingly innocuous changes
 165                          * have been known to cause runaway conditions which affected several servers, along with
 166                          * permissions issues.
 167                          *
 168                          */
 169
 170                         if (!$top_level && ($parent['wall'] == 0) && stristr($target_item['uri'], $localhost)) {
 171                                 Logger::info('Followup ' . $target_item["guid"]);
 172                                 // local followup to remote post
 173                                 $followup = true;
 174                         }
 175
 176                         if (empty($parent['allow_cid'])
 177                                 && empty($parent['allow_gid'])
 178                                 && empty($parent['deny_cid'])
 179                                 && empty($parent['deny_gid'])
 180                                 && ($parent["private"] != Model\Item::PRIVATE)) {
 181                                 $public_message = true;
 182                         }
 183                 }
 184
 185                 if (empty($items)) {
 186                         Logger::notice('No delivery data', ['command' => $cmd, 'uri-id' => $post_uriid, 'cid' => $contact_id]);
 187                 }
 188
 189                 $owner = Model\User::getOwnerDataById($uid);
 190                 if (!DBA::isResult($owner)) {
 191                         self::setFailedQueue($cmd, $target_item);
 192                         return;
 193                 }
 194
 195                 // We don't deliver our items to blocked, archived or pending contacts, and not to ourselves either
 196                 $contact = DBA::selectFirst('contact', [],
 197                         ['id' => $contact_id, 'archive' => false, 'blocked' => false, 'pending' => false, 'self' => false]
 198                 );
 199                 if (!DBA::isResult($contact)) {
 200                         self::setFailedQueue($cmd, $target_item);
 201                         return;
 202                 }
 203
 204                 if (Network::isUrlBlocked($contact['url'])) {
 205                         self::setFailedQueue($cmd, $target_item);
 206                         return;
 207                 }
 208
 209                 $protocol = Model\GServer::getProtocol($contact['gsid'] ?? 0);
 210
 211                 // Transmit via Diaspora if the thread had started as Diaspora post.
 212                 // Also transmit via Diaspora if this is a direct answer to a Diaspora comment.
 213                 // This is done since the uri wouldn't match (Diaspora doesn't transmit it)
 214                 // Also transmit relayed posts from Diaspora contacts via Diaspora.
 215                 if (($contact['network'] != Protocol::DIASPORA) && in_array(Protocol::DIASPORA, [$parent['network'] ?? '', $thr_parent['network'] ?? '', $target_item['network']] ?? '')) {
 216                         Logger::info('Enforcing the Diaspora protocol', ['id' => $contact['id'], 'network' => $contact['network'], 'parent' => $parent['network'], 'thread-parent' => $thr_parent['network'], 'post' => $target_item['network']]);
 217                         $contact['network'] = Protocol::DIASPORA;
 218                 }
 219
 220                 Logger::notice('Delivering', ['cmd' => $cmd, 'uri-id' => $post_uriid, 'followup' => $followup, 'network' => $contact['network']]);
 221
 222                 switch ($contact['network']) {
 223                         case Protocol::DFRN:
 224                                 self::deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $protocol);
 225                                 break;
 226
 227                         case Protocol::DIASPORA:
 228                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 229                                 break;
 230
 231                         case Protocol::MAIL:
 232                                 self::deliverMail($cmd, $contact, $owner, $target_item, $thr_parent);
 233                                 break;
 234
 235                         default:
 236                                 break;
 237                 }
 238
 239                 return;
 240         }
 241
 242         /**
 243          * Increased the "failed" counter in the item delivery data
 244          *
 245          * @param string $cmd  Command
 246          * @param array  $item Item array
 247          */
 248         private static function setFailedQueue(string $cmd, array $item)
 249         {
 250                 if (!in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 251                         return;
 252                 }
 253
 254                 Model\Post\DeliveryData::incrementQueueFailed($item['uri-id'] ?? $item['id']);
 255         }
 256
 257         /**
 258          * Deliver content via DFRN
 259          *
 260          * @param string  $cmd             Command
 261          * @param array   $contact         Contact record of the receiver
 262          * @param array   $owner           Owner record of the sender
 263          * @param array   $items           Item record of the content and the parent
 264          * @param array   $target_item     Item record of the content
 265          * @param boolean $public_message  Is the content public?
 266          * @param boolean $top_level       Is it a thread starter?
 267          * @param boolean $followup        Is it an answer to a remote post?
 268          * @param int     $server_protocol The protocol of the server
 269          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 270          * @throws \ImagickException
 271          */
 272         private static function deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $server_protocol)
 273         {
 274                 // Transmit Diaspora reshares via Diaspora if the Friendica contact support Diaspora
 275                 if (Diaspora::isReshare($target_item['body'] ?? '') && !empty(FContact::getByURL($contact['addr'], false))) {
 276                         Logger::info('Reshare will be transmitted via Diaspora', ['url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 277                         self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 278                         return;
 279                 }
 280
 281                 Logger::info('Deliver ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' via DFRN to ' . (($contact['addr'] ?? '') ?: $contact['url']));
 282
 283                 if ($cmd == self::MAIL) {
 284                         $item = $target_item;
 285                         $item['body'] = Model\Item::fixPrivatePhotos($item['body'], $owner['uid'], null, $item['contact-id']);
 286                         $atom = DFRN::mail($item, $owner);
 287                 } elseif ($cmd == self::SUGGESTION) {
 288                         $item = $target_item;
 289                         $atom = DFRN::fsuggest($item, $owner);
 290                         DI::fsuggest()->delete(new FriendSuggests([DI::fsuggest()->selectOneById($item['id'])]));
 291                 } elseif ($cmd == self::RELOCATION) {
 292                         $atom = DFRN::relocate($owner, $owner['uid']);
 293                 } elseif ($followup) {
 294                         $msgitems = [$target_item];
 295                         $atom = DFRN::entries($msgitems, $owner);
 296                 } else {
 297                         if ($target_item['deleted']) {
 298                                 $msgitems = [$target_item];
 299                         } else {
 300                                 $msgitems = [];
 301                                 foreach ($items as $item) {
 302                                         // Only add the parent when we don't delete other items.
 303                                         if (($target_item['id'] == $item['id']) || ($cmd != self::DELETION)) {
 304                                                 $item["entry:comment-allow"] = true;
 305                                                 $item["entry:cid"] = ($top_level ? $contact['id'] : 0);
 306                                                 $msgitems[] = $item;
 307                                         }
 308                                 }
 309                         }
 310                         $atom = DFRN::entries($msgitems, $owner);
 311                 }
 312
 313                 Logger::debug('Notifier entry: ' . $contact["url"] . ' ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' entry: ' . $atom);
 314
 315                 $protocol = Model\Post\DeliveryData::DFRN;
 316
 317                 // We don't have a relationship with contacts on a public post.
 318                 // Se we transmit with the new method and via Diaspora as a fallback
 319                 if (!empty($items) && (($items[0]['uid'] == 0) || ($contact['uid'] == 0))) {
 320                         // Transmit in public if it's a relay post
 321                         $public_dfrn = ($contact['contact-type'] == Model\Contact::TYPE_RELAY);
 322
 323                         $deliver_status = DFRN::transmit($owner, $contact, $atom, $public_dfrn);
 324
 325                         // We never spool failed relay deliveries
 326                         if ($public_dfrn) {
 327                                 Logger::info('Relay delivery to ' . $contact["url"] . ' with guid ' . $target_item["guid"] . ' returns ' . $deliver_status);
 328
 329                                 if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 330                                         if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 331                                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 332
 333                                                 Model\GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 334                                         } else {
 335                                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 336                                         }
 337                                 }
 338                                 return;
 339                         }
 340
 341                         if ((($deliver_status < 200) || ($deliver_status > 299)) && (empty($server_protocol) || ($server_protocol == Model\Post\DeliveryData::LEGACY_DFRN))) {
 342                                 // Transmit via Diaspora if not possible via Friendica
 343                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 344                                 return;
 345                         }
 346                 } else {
 347                         // DFRN payload over Diaspora transport layer
 348                         $deliver_status = DFRN::transmit($owner, $contact, $atom);
 349                 }
 350
 351                 Logger::info('DFRN Delivery', ['cmd' => $cmd, 'url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id'], 'return' => $deliver_status]);
 352
 353                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 354                         // We successfully delivered a message, the contact is alive
 355                         Model\Contact::unmarkForArchival($contact);
 356
 357                         Model\GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 358
 359                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 360                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 361                         }
 362                 } else {
 363                         // The message could not be delivered. We mark the contact as "dead"
 364                         Model\Contact::markForArchival($contact);
 365
 366                         Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 367                         if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 368                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 369                         }
 370                 }
 371         }
 372
 373         /**
 374          * Deliver content via Diaspora
 375          *
 376          * @param string  $cmd            Command
 377          * @param array   $contact        Contact record of the receiver
 378          * @param array   $owner          Owner record of the sender
 379          * @param array   $items          Item record of the content and the parent
 380          * @param array   $target_item    Item record of the content
 381          * @param boolean $public_message Is the content public?
 382          * @param boolean $top_level      Is it a thread starter?
 383          * @param boolean $followup       Is it an answer to a remote post?
 384          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 385          * @throws \ImagickException
 386          */
 387         private static function deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup)
 388         {
 389                 // We don't treat Forum posts as "wall-to-wall" to be able to post them via Diaspora
 390                 $walltowall = $top_level && ($owner['id'] != $items[0]['contact-id']) & ($owner['account-type'] != Model\User::ACCOUNT_TYPE_COMMUNITY);
 391
 392                 if ($public_message) {
 393                         $loc = 'public batch ' . $contact['batch'];
 394                 } else {
 395                         $loc = $contact['addr'];
 396                 }
 397
 398                 Logger::notice('Deliver via Diaspora', ['target' => $target_item['id'], 'guid' => $target_item['guid'], 'to' => $loc]);
 399
 400                 if (!DI::config()->get('system', 'diaspora_enabled')) {
 401                         return;
 402                 }
 403
 404                 if ($cmd == self::MAIL) {
 405                         Diaspora::sendMail($target_item, $owner, $contact);
 406                         return;
 407                 }
 408
 409                 if ($cmd == self::SUGGESTION) {
 410                         return;
 411                 }
 412
 413                 if (!$contact['pubkey'] && !$public_message) {
 414                         return;
 415                 }
 416
 417                 if ($cmd == self::RELOCATION) {
 418                         $deliver_status = Diaspora::sendAccountMigration($owner, $contact, $owner['uid']);
 419                 } elseif ($target_item['deleted'] && (($target_item['uri'] === $target_item['parent-uri']) || $followup)) {
 420                         // top-level retraction
 421                         Logger::notice('diaspora retract: ' . $loc);
 422                         $deliver_status = Diaspora::sendRetraction($target_item, $owner, $contact, $public_message);
 423                 } elseif ($followup) {
 424                         // send comments and likes to owner to relay
 425                         Logger::notice('diaspora followup: ' . $loc);
 426                         $deliver_status = Diaspora::sendFollowup($target_item, $owner, $contact, $public_message);
 427                 } elseif ($target_item['uri'] !== $target_item['parent-uri']) {
 428                         // we are the relay - send comments, likes and relayable_retractions to our conversants
 429                         Logger::notice('diaspora relay: ' . $loc);
 430                         $deliver_status = Diaspora::sendRelay($target_item, $owner, $contact, $public_message);
 431                 } elseif ($top_level && !$walltowall) {
 432                         // currently no workable solution for sending walltowall
 433                         Logger::notice('diaspora status: ' . $loc);
 434                         $deliver_status = Diaspora::sendStatus($target_item, $owner, $contact, $public_message);
 435                 } else {
 436                         Logger::notice('Unknown mode ' . $cmd . ' for ' . $loc);
 437                         return;
 438                 }
 439
 440                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 441                         // We successfully delivered a message, the contact is alive
 442                         Model\Contact::unmarkForArchival($contact);
 443
 444                         Model\GServer::setProtocol($contact['gsid'] ?? 0, Model\Post\DeliveryData::DIASPORA);
 445
 446                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 447                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::DIASPORA);
 448                         }
 449                 } else {
 450                         // The message could not be delivered. We mark the contact as "dead"
 451                         Model\Contact::markForArchival($contact);
 452
 453                         // When it is delivered to the public endpoint, we do mark the relay contact for archival as well
 454                         if ($public_message) {
 455                                 Relay::markForArchival($contact);
 456                         }
 457
 458                         if (empty($contact['contact-type']) || ($contact['contact-type'] != Model\Contact::TYPE_RELAY)) {
 459                                 Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 460                                 // defer message for redelivery
 461                                 if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 462                                         Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 463                                 }
 464                         } elseif (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 465                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 466                         }
 467                 }
 468         }
 469
 470         /**
 471          * Deliver content via mail
 472          *
 473          * @param string $cmd         Command
 474          * @param array  $contact     Contact record of the receiver
 475          * @param array  $owner       Owner record of the sender
 476          * @param array  $target_item Item record of the content
 477          * @param array  $thr_parent  Item record of the direct parent in the thread
 478          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 479          * @throws \ImagickException
 480          */
 481         private static function deliverMail($cmd, $contact, $owner, $target_item, $thr_parent)
 482         {
 483                 if (DI::config()->get('system','imap_disabled')) {
 484                         return;
 485                 }
 486
 487                 $addr = $contact['addr'];
 488                 if (!strlen($addr)) {
 489                         return;
 490                 }
 491
 492                 if (!in_array($cmd, [self::POST, self::POKE])) {
 493                         return;
 494                 }
 495
 496                 if ($target_item['verb'] != Activity::POST) {
 497                         return;
 498                 }
 499
 500                 if (!empty($thr_parent['object'])) {
 501                         $data = json_decode($thr_parent['object'], true);
 502                         if (!empty($data['reply_to'])) {
 503                                 $addr = $data['reply_to'][0]['mailbox'] . '@' . $data['reply_to'][0]['host'];
 504                                 Logger::info('Use "reply-to" address of the thread parent', ['addr' => $addr]);
 505                         } elseif (!empty($data['from'])) {
 506                                 $addr = $data['from'][0]['mailbox'] . '@' . $data['from'][0]['host'];
 507                                 Logger::info('Use "from" address of the thread parent', ['addr' => $addr]);
 508                         }
 509                 }
 510
 511                 $local_user = DBA::selectFirst('user', [], ['uid' => $owner['uid']]);
 512                 if (!DBA::isResult($local_user)) {
 513                         return;
 514                 }
 515
 516                 Logger::info('About to deliver via mail', ['guid' => $target_item['guid'], 'to' => $addr]);
 517
 518                 $reply_to = '';
 519                 $mailacct = DBA::selectFirst('mailacct', ['reply_to'], ['uid' => $owner['uid']]);
 520                 if (DBA::isResult($mailacct) && !empty($mailacct['reply_to'])) {
 521                         $reply_to = $mailacct['reply_to'];
 522                 }
 523
 524                 $subject  = ($target_item['title'] ? Email::encodeHeader($target_item['title'], 'UTF-8') : DI::l10n()->t("\x28no subject\x29"));
 525
 526                 // only expose our real email address to true friends
 527
 528                 if (($contact['rel'] == Model\Contact::FRIEND) && !$contact['blocked']) {
 529                         if ($reply_to) {
 530                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $reply_to . '>' . "\n";
 531                                 $headers .= 'Sender: ' . $local_user['email'] . "\n";
 532                         } else {
 533                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $local_user['email'] . '>' . "\n";
 534                         }
 535                 } else {
 536                         $sender = DI::config()->get('config', 'sender_email', 'noreply@' . DI::baseUrl()->getHostname());
 537                         $headers  = 'From: '. Email::encodeHeader($local_user['username'], 'UTF-8') . ' <' . $sender . '>' . "\n";
 538                 }
 539
 540                 $headers .= 'Message-Id: <' . Email::iri2msgid($target_item['uri']) . '>' . "\n";
 541
 542                 if ($target_item['uri'] !== $target_item['parent-uri']) {
 543                         $headers .= 'References: <' . Email::iri2msgid($target_item['parent-uri']) . '>';
 544
 545                         // Export more references on deeper nested threads
 546                         if (($target_item['thr-parent'] != '') && ($target_item['thr-parent'] != $target_item['parent-uri'])) {
 547                                 $headers .= ' <' . Email::iri2msgid($target_item['thr-parent']) . '>';
 548                         }
 549
 550                         $headers .= "\n";
 551
 552                         if (empty($target_item['title'])) {
 553                                 $condition = ['uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 554                                 $title = Model\Post::selectFirst(['title'], $condition);
 555
 556                                 if (DBA::isResult($title) && ($title['title'] != '')) {
 557                                         $subject = $title['title'];
 558                                 } else {
 559                                         $condition = ['parent-uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 560                                         $title = Model\Post::selectFirst(['title'], $condition);
 561
 562                                         if (DBA::isResult($title) && ($title['title'] != '')) {
 563                                                 $subject = $title['title'];
 564                                         }
 565                                 }
 566                         }
 567
 568                         if (strncasecmp($subject, 'RE:', 3)) {
 569                                 $subject = 'Re: ' . $subject;
 570                         }
 571                 }
 572
 573                 Email::send($addr, $subject, $headers, $target_item);
 574
 575                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::MAIL);
 576
 577                 Logger::info('Delivered via mail', ['guid' => $target_item['guid'], 'to' => $addr, 'subject' => $subject]);
 578         }
 579 }