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\Core\Worker;
  29 use Friendica\Database\DBA;
  30 use Friendica\DI;
  31 use Friendica\Model\Contact;
  32 use Friendica\Model\FContact;
  33 use Friendica\Model\GServer;
  34 use Friendica\Model\Item;
  35 use Friendica\Model\Post;
  36 use Friendica\Model\User;
  37 use Friendica\Protocol\Activity;
  38 use Friendica\Protocol\DFRN;
  39 use Friendica\Protocol\Diaspora;
  40 use Friendica\Protocol\Email;
  41 use Friendica\Protocol\Relay;
  42 use Friendica\Util\Network;
  43
  44 class Delivery
  45 {
  46         const MAIL          = 'mail';
  47         const SUGGESTION    = 'suggest';
  48         const RELOCATION    = 'relocate';
  49         const DELETION      = 'drop';
  50         const POST          = 'wall-new';
  51         const REMOVAL       = 'removeme';
  52         const PROFILEUPDATE = 'profileupdate';
  53
  54         public static function execute(string $cmd, int $post_uriid, int $contact_id, int $sender_uid = 0)
  55         {
  56                 Logger::info('Invoked', ['cmd' => $cmd, 'target' => $post_uriid, 'sender_uid' => $sender_uid, 'contact' => $contact_id]);
  57
  58                 $top_level = false;
  59                 $followup = false;
  60                 $public_message = false;
  61
  62                 $items = [];
  63                 if ($cmd == self::MAIL) {
  64                         $target_item = DBA::selectFirst('mail', [], ['id' => $post_uriid]);
  65                         if (!DBA::isResult($target_item)) {
  66                                 return;
  67                         }
  68                         $uid = $target_item['uid'];
  69                 } elseif ($cmd == self::SUGGESTION) {
  70                         try {
  71                                 $target_item = DI::fsuggest()->selectOneById($post_uriid)->toArray();
  72                         } catch (FriendSuggestNotFoundException $e) {
  73                                 DI::logger()->info('Cannot find FriendSuggestion', ['id' => $post_uriid]);
  74                                 return;
  75                         }
  76                         $uid = $target_item['uid'];
  77                 } elseif ($cmd == self::RELOCATION) {
  78                         $uid = $post_uriid;
  79                         $target_item = [];
  80                 } else {
  81                         $item = Post::selectFirst(['id', 'parent'], ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  82                         if (!DBA::isResult($item) || empty($item['parent'])) {
  83                                 Logger::warning('Post not found', ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  84                                 return;
  85                         }
  86                         $target_id = intval($item['id']);
  87                         $parent_id = intval($item['parent']);
  88
  89                         $condition = ['id' => [$target_id, $parent_id], 'visible' => true];
  90                         $params = ['order' => ['id']];
  91                         $itemdata = Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
  92
  93                         while ($item = Post::fetch($itemdata)) {
  94                                 if ($item['verb'] == Activity::ANNOUNCE) {
  95                                         continue;
  96                                 }
  97
  98                                 if ($item['id'] == $parent_id) {
  99                                         $parent = $item;
 100                                 }
 101                                 if ($item['id'] == $target_id) {
 102                                         $target_item = $item;
 103                                 }
 104                                 $items[] = $item;
 105                         }
 106                         DBA::close($itemdata);
 107
 108                         if (empty($target_item)) {
 109                                 Logger::warning("No target item data. Quitting here.", ['id' => $target_id]);
 110                                 return;
 111                         }
 112
 113                         if (empty($parent)) {
 114                                 Logger::warning('Parent ' . $parent_id . ' for item ' . $target_id . "wasn't found. Quitting here.");
 115                                 self::setFailedQueue($cmd, $target_item);
 116                                 return;
 117                         }
 118
 119                         if (!empty($target_item['contact-uid'])) {
 120                                 $uid = $target_item['contact-uid'];
 121                         } elseif (!empty($target_item['uid'])) {
 122                                 $uid = $target_item['uid'];
 123                         } else {
 124                                 Logger::info('Only public users for item ' . $target_id);
 125                                 self::setFailedQueue($cmd, $target_item);
 126                                 return;
 127                         }
 128
 129                         $condition = ['uri' => $target_item['thr-parent'], 'uid' => $target_item['uid']];
 130                         $thr_parent = Post::selectFirst(['network', 'object'], $condition);
 131                         if (!DBA::isResult($thr_parent)) {
 132                                 // Shouldn't happen. But when this does, we just take the parent as thread parent.
 133                                 // That's totally okay for what we use this variable here.
 134                                 $thr_parent = $parent;
 135                         }
 136
 137                         if (!empty($contact_id) && Contact::isArchived($contact_id)) {
 138                                 Logger::info('Contact is archived', ['id' => $contact_id, 'cmd' => $cmd, 'item' => $target_item['id']]);
 139                                 self::setFailedQueue($cmd, $target_item);
 140                                 return;
 141                         }
 142
 143                         // avoid race condition with deleting entries
 144                         if ($items[0]['deleted']) {
 145                                 foreach ($items as $item) {
 146                                         $item['deleted'] = 1;
 147                                 }
 148                         }
 149
 150                         $top_level = $target_item['gravity'] == Item::GRAVITY_PARENT;
 151
 152                         // This is IMPORTANT!!!!
 153
 154                         // We will only send a "notify owner to relay" or followup message if the referenced post
 155                         // originated on our system by virtue of having our hostname somewhere
 156                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 157                         // if $parent['wall'] == 1 we will already have the parent message in our array
 158                         // and we will relay the whole lot.
 159
 160                         $localhost = DI::baseUrl()->getHostname();
 161                         if (strpos($localhost, ':')) {
 162                                 $localhost = substr($localhost, 0, strpos($localhost, ':'));
 163                         }
 164                         /**
 165                          *
 166                          * Be VERY CAREFUL if you make any changes to the following line. Seemingly innocuous changes
 167                          * have been known to cause runaway conditions which affected several servers, along with
 168                          * permissions issues.
 169                          *
 170                          */
 171
 172                         if (!$top_level && ($parent['wall'] == 0) && stristr($target_item['uri'], $localhost)) {
 173                                 Logger::info('Followup ' . $target_item["guid"]);
 174                                 // local followup to remote post
 175                                 $followup = true;
 176                         }
 177
 178                         if (empty($parent['allow_cid'])
 179                                 && empty($parent['allow_gid'])
 180                                 && empty($parent['deny_cid'])
 181                                 && empty($parent['deny_gid'])
 182                                 && ($parent['private'] != Item::PRIVATE)) {
 183                                 $public_message = true;
 184                         }
 185                 }
 186
 187                 if (empty($items)) {
 188                         Logger::warning('No delivery data', ['command' => $cmd, 'uri-id' => $post_uriid, 'cid' => $contact_id]);
 189                 }
 190
 191                 $owner = User::getOwnerDataById($uid);
 192                 if (!DBA::isResult($owner)) {
 193                         self::setFailedQueue($cmd, $target_item);
 194                         return;
 195                 }
 196
 197                 // We don't deliver our items to blocked, archived or pending contacts, and not to ourselves either
 198                 $contact = DBA::selectFirst('contact', [],
 199                         ['id' => $contact_id, 'archive' => false, 'blocked' => false, 'pending' => false, 'self' => false]
 200                 );
 201                 if (!DBA::isResult($contact)) {
 202                         self::setFailedQueue($cmd, $target_item);
 203                         return;
 204                 }
 205
 206                 if (Network::isUrlBlocked($contact['url'])) {
 207                         self::setFailedQueue($cmd, $target_item);
 208                         return;
 209                 }
 210
 211                 $protocol = GServer::getProtocol($contact['gsid'] ?? 0);
 212
 213                 // Transmit via Diaspora if the thread had started as Diaspora post.
 214                 // Also transmit via Diaspora if this is a direct answer to a Diaspora comment.
 215                 // This is done since the uri wouldn't match (Diaspora doesn't transmit it)
 216                 // Also transmit relayed posts from Diaspora contacts via Diaspora.
 217                 if (($contact['network'] != Protocol::DIASPORA) && in_array(Protocol::DIASPORA, [$parent['network'] ?? '', $thr_parent['network'] ?? '', $target_item['network']] ?? '')) {
 218                         Logger::info('Enforcing the Diaspora protocol', ['id' => $contact['id'], 'network' => $contact['network'], 'parent' => $parent['network'], 'thread-parent' => $thr_parent['network'], 'post' => $target_item['network']]);
 219                         $contact['network'] = Protocol::DIASPORA;
 220                 }
 221
 222                 Logger::notice('Delivering', ['cmd' => $cmd, 'uri-id' => $post_uriid, 'followup' => $followup, 'network' => $contact['network']]);
 223
 224                 switch ($contact['network']) {
 225                         case Protocol::DFRN:
 226                                 self::deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $protocol);
 227                                 break;
 228
 229                         case Protocol::DIASPORA:
 230                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 231                                 break;
 232
 233                         case Protocol::MAIL:
 234                                 self::deliverMail($cmd, $contact, $owner, $target_item, $thr_parent);
 235                                 break;
 236
 237                         default:
 238                                 break;
 239                 }
 240
 241                 return;
 242         }
 243
 244         /**
 245          * Increased the "failed" counter in the item delivery data
 246          *
 247          * @param string $cmd  Command
 248          * @param array  $item Item array
 249          *
 250          * @return void
 251          */
 252         private static function setFailedQueue(string $cmd, array $item)
 253         {
 254                 if ($cmd != Delivery::POST) {
 255                         return;
 256                 }
 257
 258                 Post\DeliveryData::incrementQueueFailed($item['uri-id'] ?? $item['id']);
 259         }
 260
 261         /**
 262          * Deliver content via DFRN
 263          *
 264          * @param string   $cmd             Command
 265          * @param array    $contact         Contact record of the receiver
 266          * @param array    $owner           Owner record of the sender
 267          * @param array    $items           Item record of the content and the parent
 268          * @param array    $target_item     Item record of the content
 269          * @param boolean  $public_message  Is the content public?
 270          * @param boolean  $top_level       Is it a thread starter?
 271          * @param boolean  $followup        Is it an answer to a remote post?
 272          * @param int|null $server_protocol The protocol of the server
 273          *
 274          * @return void
 275          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 276          * @throws \ImagickException
 277          */
 278         private static function deliverDFRN(string $cmd, array $contact, array $owner, array $items, array $target_item, bool $public_message, bool $top_level, bool $followup, int $server_protocol = null)
 279         {
 280                 // Transmit Diaspora reshares via Diaspora if the Friendica contact support Diaspora
 281                 if (Diaspora::getReshareDetails($target_item ?? []) && !empty(FContact::getByURL($contact['addr'], false))) {
 282                         Logger::info('Reshare will be transmitted via Diaspora', ['url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 283                         self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 284                         return;
 285                 }
 286
 287                 Logger::info('Deliver ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' via DFRN to ' . (($contact['addr'] ?? '') ?: $contact['url']));
 288
 289                 if ($cmd == self::MAIL) {
 290                         $item = $target_item;
 291                         $item['body'] = Item::fixPrivatePhotos($item['body'], $owner['uid'], null, $item['contact-id']);
 292                         $atom = DFRN::mail($item, $owner);
 293                 } elseif ($cmd == self::SUGGESTION) {
 294                         $item = $target_item;
 295                         $atom = DFRN::fsuggest($item, $owner);
 296                         DI::fsuggest()->delete(new FriendSuggests([DI::fsuggest()->selectOneById($item['id'])]));
 297                 } elseif ($cmd == self::RELOCATION) {
 298                         $atom = DFRN::relocate($owner, $owner['uid']);
 299                 } elseif ($followup) {
 300                         $msgitems = [$target_item];
 301                         $atom = DFRN::entries($msgitems, $owner);
 302                 } else {
 303                         if ($target_item['deleted']) {
 304                                 $msgitems = [$target_item];
 305                         } else {
 306                                 $msgitems = [];
 307                                 foreach ($items as $item) {
 308                                         // Only add the parent when we don't delete other items.
 309                                         if (($target_item['id'] == $item['id']) || ($cmd != self::DELETION)) {
 310                                                 $item['entry:comment-allow'] = true;
 311                                                 $item['entry:cid'] = ($top_level ? $contact['id'] : 0);
 312                                                 $msgitems[] = $item;
 313                                         }
 314                                 }
 315                         }
 316                         $atom = DFRN::entries($msgitems, $owner);
 317                 }
 318
 319                 Logger::debug('Notifier entry: ' . $contact['url'] . ' ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' entry: ' . $atom);
 320
 321                 $protocol = Post\DeliveryData::DFRN;
 322
 323                 // We don't have a relationship with contacts on a public post.
 324                 // Se we transmit with the new method and via Diaspora as a fallback
 325                 if (!empty($items) && (($items[0]['uid'] == 0) || ($contact['uid'] == 0))) {
 326                         // Transmit in public if it's a relay post
 327                         $public_dfrn = ($contact['contact-type'] == Contact::TYPE_RELAY);
 328
 329                         $deliver_status = DFRN::transmit($owner, $contact, $atom, $public_dfrn);
 330
 331                         // We never spool failed relay deliveries
 332                         if ($public_dfrn) {
 333                                 Logger::info('Relay delivery to ' . $contact['url'] . ' with guid ' . $target_item['guid'] . ' returns ' . $deliver_status);
 334
 335                                 if ($cmd == Delivery::POST) {
 336                                         if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 337                                                 Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 338
 339                                                 GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 340                                         } else {
 341                                                 Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 342                                         }
 343                                 }
 344                                 return;
 345                         }
 346
 347                         if ((($deliver_status < 200) || ($deliver_status > 299)) && (empty($server_protocol) || ($server_protocol == Post\DeliveryData::LEGACY_DFRN))) {
 348                                 // Transmit via Diaspora if not possible via Friendica
 349                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 350                                 return;
 351                         }
 352                 } else {
 353                         // DFRN payload over Diaspora transport layer
 354                         $deliver_status = DFRN::transmit($owner, $contact, $atom);
 355                 }
 356
 357                 Logger::info('DFRN Delivery', ['cmd' => $cmd, 'url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id'], 'return' => $deliver_status]);
 358
 359                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 360                         // We successfully delivered a message, the contact is alive
 361                         Contact::unmarkForArchival($contact);
 362
 363                         GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 364
 365                         if ($cmd == Delivery::POST) {
 366                                 Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 367                         }
 368                 } else {
 369                         // The message could not be delivered. We mark the contact as "dead"
 370                         Contact::markForArchival($contact);
 371
 372                         Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 373                         if (!Worker::defer() && $cmd == Delivery::POST) {
 374                                 Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 375                         }
 376                 }
 377         }
 378
 379         /**
 380          * Deliver content via Diaspora
 381          *
 382          * @param string  $cmd            Command
 383          * @param array   $contact        Contact record of the receiver
 384          * @param array   $owner          Owner record of the sender
 385          * @param array   $items          Item record of the content and the parent
 386          * @param array   $target_item    Item record of the content
 387          * @param boolean $public_message Is the content public?
 388          * @param boolean $top_level      Is it a thread starter?
 389          * @param boolean $followup       Is it an answer to a remote post?
 390          *
 391          * @return void
 392          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 393          * @throws \ImagickException
 394          */
 395         private static function deliverDiaspora(string $cmd, array $contact, array $owner, array $items, array $target_item, bool $public_message, bool $top_level, bool $followup)
 396         {
 397                 // We don't treat Forum posts as "wall-to-wall" to be able to post them via Diaspora
 398                 $walltowall = $top_level && ($owner['id'] != $items[0]['contact-id']) & ($owner['account-type'] != User::ACCOUNT_TYPE_COMMUNITY);
 399
 400                 if ($public_message) {
 401                         $loc = 'public batch ' . $contact['batch'];
 402                 } else {
 403                         $loc = $contact['addr'];
 404                 }
 405
 406                 Logger::notice('Deliver via Diaspora', ['target' => $target_item['id'], 'guid' => $target_item['guid'], 'to' => $loc]);
 407
 408                 if (!DI::config()->get('system', 'diaspora_enabled')) {
 409                         return;
 410                 }
 411
 412                 if ($cmd == self::MAIL) {
 413                         Diaspora::sendMail($target_item, $owner, $contact);
 414                         return;
 415                 }
 416
 417                 if ($cmd == self::SUGGESTION) {
 418                         return;
 419                 }
 420
 421                 if (!$contact['pubkey'] && !$public_message) {
 422                         return;
 423                 }
 424
 425                 if ($cmd == self::RELOCATION) {
 426                         $deliver_status = Diaspora::sendAccountMigration($owner, $contact, $owner['uid']);
 427                 } elseif ($target_item['deleted'] && (($target_item['uri'] === $target_item['parent-uri']) || $followup)) {
 428                         // top-level retraction
 429                         Logger::notice('diaspora retract: ' . $loc);
 430                         $deliver_status = Diaspora::sendRetraction($target_item, $owner, $contact, $public_message);
 431                 } elseif ($followup) {
 432                         // send comments and likes to owner to relay
 433                         Logger::notice('diaspora followup: ' . $loc);
 434                         $deliver_status = Diaspora::sendFollowup($target_item, $owner, $contact, $public_message);
 435                 } elseif ($target_item['uri'] !== $target_item['parent-uri']) {
 436                         // we are the relay - send comments, likes and relayable_retractions to our conversants
 437                         Logger::notice('diaspora relay: ' . $loc);
 438                         $deliver_status = Diaspora::sendRelay($target_item, $owner, $contact, $public_message);
 439                 } elseif ($top_level && !$walltowall) {
 440                         // currently no workable solution for sending walltowall
 441                         Logger::notice('diaspora status: ' . $loc);
 442                         $deliver_status = Diaspora::sendStatus($target_item, $owner, $contact, $public_message);
 443                 } else {
 444                         Logger::warning('Unknown mode', ['command' => $cmd, 'target' => $loc]);
 445                         return;
 446                 }
 447
 448                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 449                         // We successfully delivered a message, the contact is alive
 450                         Contact::unmarkForArchival($contact);
 451
 452                         GServer::setProtocol($contact['gsid'] ?? 0, Post\DeliveryData::DIASPORA);
 453
 454                         if ($cmd == Delivery::POST) {
 455                                 Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Post\DeliveryData::DIASPORA);
 456                         }
 457                 } else {
 458                         // The message could not be delivered. We mark the contact as "dead"
 459                         Contact::markForArchival($contact);
 460
 461                         // When it is delivered to the public endpoint, we do mark the relay contact for archival as well
 462                         if ($public_message) {
 463                                 Relay::markForArchival($contact);
 464                         }
 465
 466                         if (empty($contact['contact-type']) || ($contact['contact-type'] != Contact::TYPE_RELAY)) {
 467                                 Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 468                                 // defer message for redelivery
 469                                 if (!Worker::defer() && $cmd == Delivery::POST) {
 470                                         Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 471                                 }
 472                         } elseif ($cmd == Delivery::POST) {
 473                                 Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 474                         }
 475                 }
 476         }
 477
 478         /**
 479          * Deliver content via mail
 480          *
 481          * @param string $cmd         Command
 482          * @param array  $contact     Contact record of the receiver
 483          * @param array  $owner       Owner record of the sender
 484          * @param array  $target_item Item record of the content
 485          * @param array  $thr_parent  Item record of the direct parent in the thread
 486          *
 487          * @return void
 488          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 489          * @throws \ImagickException
 490          */
 491         private static function deliverMail(string $cmd, array $contact, array $owner, array $target_item, array $thr_parent)
 492         {
 493                 if (DI::config()->get('system', 'imap_disabled')) {
 494                         return;
 495                 }
 496
 497                 $addr = $contact['addr'];
 498                 if (!strlen($addr)) {
 499                         return;
 500                 }
 501
 502                 if ($cmd != self::POST) {
 503                         return;
 504                 }
 505
 506                 if ($target_item['verb'] != Activity::POST) {
 507                         return;
 508                 }
 509
 510                 if (!empty($thr_parent['object'])) {
 511                         $data = json_decode($thr_parent['object'], true);
 512                         if (!empty($data['reply_to'])) {
 513                                 $addr = $data['reply_to'][0]['mailbox'] . '@' . $data['reply_to'][0]['host'];
 514                                 Logger::info('Use "reply-to" address of the thread parent', ['addr' => $addr]);
 515                         } elseif (!empty($data['from'])) {
 516                                 $addr = $data['from'][0]['mailbox'] . '@' . $data['from'][0]['host'];
 517                                 Logger::info('Use "from" address of the thread parent', ['addr' => $addr]);
 518                         }
 519                 }
 520
 521                 $local_user = DBA::selectFirst('user', [], ['uid' => $owner['uid']]);
 522                 if (!DBA::isResult($local_user)) {
 523                         return;
 524                 }
 525
 526                 Logger::info('About to deliver via mail', ['guid' => $target_item['guid'], 'to' => $addr]);
 527
 528                 $reply_to = '';
 529                 $mailacct = DBA::selectFirst('mailacct', ['reply_to'], ['uid' => $owner['uid']]);
 530                 if (DBA::isResult($mailacct) && !empty($mailacct['reply_to'])) {
 531                         $reply_to = $mailacct['reply_to'];
 532                 }
 533
 534                 $subject  = ($target_item['title'] ? Email::encodeHeader($target_item['title'], 'UTF-8') : DI::l10n()->t("\x28no subject\x29"));
 535
 536                 // only expose our real email address to true friends
 537
 538                 if (($contact['rel'] == Contact::FRIEND) && !$contact['blocked']) {
 539                         if ($reply_to) {
 540                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $reply_to . '>' . "\n";
 541                                 $headers .= 'Sender: ' . $local_user['email'] . "\n";
 542                         } else {
 543                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $local_user['email'] . '>' . "\n";
 544                         }
 545                 } else {
 546                         $sender = DI::config()->get('config', 'sender_email', 'noreply@' . DI::baseUrl()->getHostname());
 547                         $headers  = 'From: '. Email::encodeHeader($local_user['username'], 'UTF-8') . ' <' . $sender . '>' . "\n";
 548                 }
 549
 550                 $headers .= 'Message-Id: <' . Email::iri2msgid($target_item['uri']) . '>' . "\n";
 551
 552                 if ($target_item['uri'] !== $target_item['parent-uri']) {
 553                         $headers .= 'References: <' . Email::iri2msgid($target_item['parent-uri']) . '>';
 554
 555                         // Export more references on deeper nested threads
 556                         if (($target_item['thr-parent'] != '') && ($target_item['thr-parent'] != $target_item['parent-uri'])) {
 557                                 $headers .= ' <' . Email::iri2msgid($target_item['thr-parent']) . '>';
 558                         }
 559
 560                         $headers .= "\n";
 561
 562                         if (empty($target_item['title'])) {
 563                                 $condition = ['uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 564                                 $title = Post::selectFirst(['title'], $condition);
 565
 566                                 if (DBA::isResult($title) && ($title['title'] != '')) {
 567                                         $subject = $title['title'];
 568                                 } else {
 569                                         $condition = ['parent-uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 570                                         $title = Post::selectFirst(['title'], $condition);
 571
 572                                         if (DBA::isResult($title) && ($title['title'] != '')) {
 573                                                 $subject = $title['title'];
 574                                         }
 575                                 }
 576                         }
 577
 578                         if (strncasecmp($subject, 'RE:', 3)) {
 579                                 $subject = 'Re: ' . $subject;
 580                         }
 581                 }
 582
 583                 // Try to send email
 584                 $success = Email::send($addr, $subject, $headers, $target_item);
 585
 586                 if ($success) {
 587                         // Success
 588                         Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Post\DeliveryData::MAIL);
 589                         Logger::info('Delivered via mail', ['guid' => $target_item['guid'], 'to' => $addr, 'subject' => $subject]);
 590                 } else {
 591                         // Failed
 592                         Logger::warning('Delivery of mail has FAILED', ['to' => $addr, 'subject' => $subject, 'guid' => $target_item['guid']]);
 593                 }
 594         }
 595 }