src/Worker/Delivery.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Worker;
  23
  24 use Friendica\Core\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\Strings;
  34 use Friendica\Util\Network;
  35 use Friendica\Core\Worker;
  36 use Friendica\Model\Conversation;
  37 use Friendica\Model\FContact;
  38 use Friendica\Model\Item;
  39 use Friendica\Model\Post;
  40 use Friendica\Protocol\Relay;
  41
  42 class Delivery
  43 {
  44         const MAIL          = 'mail';
  45         const SUGGESTION    = 'suggest';
  46         const RELOCATION    = 'relocate';
  47         const DELETION      = 'drop';
  48         const POST          = 'wall-new';
  49         const POKE          = 'poke';
  50         const UPLINK        = 'uplink';
  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' => $contact_id]);
  57
  58                 if (!empty($sender_uid)) {
  59                         $post = Post::selectFirst(['id'], ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  60                         if (!DBA::isResult($post)) {
  61                                 Logger::warning('Post not found', ['uri-id' => $post_uriid, 'uid' => $sender_uid]);
  62                                 return;
  63                         }
  64                         $target_id = $post['id'];
  65                 } else {
  66                         $target_id = $post_uriid;
  67                 }
  68
  69                 $top_level = false;
  70                 $followup = false;
  71                 $public_message = false;
  72
  73                 $items = [];
  74                 if ($cmd == self::MAIL) {
  75                         $target_item = DBA::selectFirst('mail', [], ['id' => $target_id]);
  76                         if (!DBA::isResult($target_item)) {
  77                                 return;
  78                         }
  79                         $uid = $target_item['uid'];
  80                 } elseif ($cmd == self::SUGGESTION) {
  81                         $target_item = DBA::selectFirst('fsuggest', [], ['id' => $target_id]);
  82                         if (!DBA::isResult($target_item)) {
  83                                 return;
  84                         }
  85                         $uid = $target_item['uid'];
  86                 } elseif ($cmd == self::RELOCATION) {
  87                         $uid = $target_id;
  88                         $target_item = [];
  89                 } else {
  90                         $item = Model\Post::selectFirst(['parent'], ['id' => $target_id]);
  91                         if (!DBA::isResult($item) || empty($item['parent'])) {
  92                                 return;
  93                         }
  94                         $parent_id = intval($item['parent']);
  95
  96                         $condition = ['id' => [$target_id, $parent_id], 'visible' => true];
  97                         $params = ['order' => ['id']];
  98                         $itemdata = Model\Post::select(Item::DELIVER_FIELDLIST, $condition, $params);
  99
 100                         while ($item = Model\Post::fetch($itemdata)) {
 101                                 if ($item['verb'] == Activity::ANNOUNCE) {
 102                                         continue;
 103                                 }
 104
 105                                 if ($item['id'] == $parent_id) {
 106                                         $parent = $item;
 107                                 }
 108                                 if ($item['id'] == $target_id) {
 109                                         $target_item = $item;
 110                                 }
 111                                 $items[] = $item;
 112                         }
 113                         DBA::close($itemdata);
 114
 115                         if (empty($target_item)) {
 116                                 Logger::log('Item ' . $target_id . "wasn't found. Quitting here.");
 117                                 return;
 118                         }
 119
 120                         if (empty($parent)) {
 121                                 Logger::log('Parent ' . $parent_id . ' for item ' . $target_id . "wasn't found. Quitting here.");
 122                                 self::setFailedQueue($cmd, $target_item);
 123                                 return;
 124                         }
 125
 126                         if (!empty($target_item['contact-uid'])) {
 127                                 $uid = $target_item['contact-uid'];
 128                         } elseif (!empty($target_item['uid'])) {
 129                                 $uid = $target_item['uid'];
 130                         } else {
 131                                 Logger::log('Only public users for item ' . $target_id, Logger::DEBUG);
 132                                 self::setFailedQueue($cmd, $target_item);
 133                                 return;
 134                         }
 135
 136                         $condition = ['uri' => $target_item['thr-parent'], 'uid' => $target_item['uid']];
 137                         $thr_parent = Model\Post::selectFirst(['network', 'object'], $condition);
 138                         if (!DBA::isResult($thr_parent)) {
 139                                 // Shouldn't happen. But when this does, we just take the parent as thread parent.
 140                                 // That's totally okay for what we use this variable here.
 141                                 $thr_parent = $parent;
 142                         }
 143
 144                         if (!empty($contact_id) && Model\Contact::isArchived($contact_id)) {
 145                                 Logger::info('Contact is archived', ['id' => $contact_id, 'cmd' => $cmd, 'item' => $target_item['id']]);
 146                                 self::setFailedQueue($cmd, $target_item);
 147                                 return;
 148                         }
 149
 150                         // avoid race condition with deleting entries
 151                         if ($items[0]['deleted']) {
 152                                 foreach ($items as $item) {
 153                                         $item['deleted'] = 1;
 154                                 }
 155                         }
 156
 157                         $top_level = $target_item['gravity'] == GRAVITY_PARENT;
 158
 159                         // This is IMPORTANT!!!!
 160
 161                         // We will only send a "notify owner to relay" or followup message if the referenced post
 162                         // originated on our system by virtue of having our hostname somewhere
 163                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 164                         // if $parent['wall'] == 1 we will already have the parent message in our array
 165                         // and we will relay the whole lot.
 166
 167                         $localhost = DI::baseUrl()->getHostname();
 168                         if (strpos($localhost, ':')) {
 169                                 $localhost = substr($localhost, 0, strpos($localhost, ':'));
 170                         }
 171                         /**
 172                          *
 173                          * Be VERY CAREFUL if you make any changes to the following line. Seemingly innocuous changes
 174                          * have been known to cause runaway conditions which affected several servers, along with
 175                          * permissions issues.
 176                          *
 177                          */
 178
 179                         if (!$top_level && ($parent['wall'] == 0) && stristr($target_item['uri'], $localhost)) {
 180                                 Logger::log('Followup ' . $target_item["guid"], Logger::DEBUG);
 181                                 // local followup to remote post
 182                                 $followup = true;
 183                         }
 184
 185                         if (empty($parent['allow_cid'])
 186                                 && empty($parent['allow_gid'])
 187                                 && empty($parent['deny_cid'])
 188                                 && empty($parent['deny_gid'])
 189                                 && ($parent["private"] != Model\Item::PRIVATE)) {
 190                                 $public_message = true;
 191                         }
 192                 }
 193
 194                 if (empty($items)) {
 195                         Logger::log('No delivery data for  ' . $cmd . ' - Item ID: ' .$target_id . ' - Contact ID: ' . $contact_id);
 196                 }
 197
 198                 $owner = Model\User::getOwnerDataById($uid);
 199                 if (!DBA::isResult($owner)) {
 200                         self::setFailedQueue($cmd, $target_item);
 201                         return;
 202                 }
 203
 204                 // We don't deliver our items to blocked, archived or pending contacts, and not to ourselves either
 205                 $contact = DBA::selectFirst('contact', [],
 206                         ['id' => $contact_id, 'archive' => false, 'blocked' => false, 'pending' => false, 'self' => false]
 207                 );
 208                 if (!DBA::isResult($contact)) {
 209                         self::setFailedQueue($cmd, $target_item);
 210                         return;
 211                 }
 212
 213                 if (Network::isUrlBlocked($contact['url'])) {
 214                         self::setFailedQueue($cmd, $target_item);
 215                         return;
 216                 }
 217
 218                 $protocol = Model\GServer::getProtocol($contact['gsid'] ?? 0);
 219
 220                 // Transmit via Diaspora if the thread had started as Diaspora post.
 221                 // Also transmit via Diaspora if this is a direct answer to a Diaspora comment.
 222                 // This is done since the uri wouldn't match (Diaspora doesn't transmit it)
 223                 // Also transmit relayed posts from Diaspora contacts via Diaspora.
 224                 if (!empty($parent) && !empty($thr_parent) && in_array(Protocol::DIASPORA, [$parent['network'], $thr_parent['network'], $target_item['network']])) {
 225                         $contact['network'] = Protocol::DIASPORA;
 226                 }
 227
 228                 // Ensure that local contacts are delivered locally
 229                 if (Model\Contact::isLocal($contact['url'])) {
 230                         $contact['network'] = Protocol::DFRN;
 231                 }
 232
 233                 Logger::notice('Delivering', ['cmd' => $cmd, 'target' => $target_id, 'followup' => $followup, 'network' => $contact['network']]);
 234
 235                 switch ($contact['network']) {
 236                         case Protocol::DFRN:
 237                                 self::deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $protocol);
 238                                 break;
 239
 240                         case Protocol::DIASPORA:
 241                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 242                                 break;
 243
 244                         case Protocol::MAIL:
 245                                 self::deliverMail($cmd, $contact, $owner, $target_item, $thr_parent);
 246                                 break;
 247
 248                         default:
 249                                 break;
 250                 }
 251
 252                 return;
 253         }
 254
 255         /**
 256          * Increased the "failed" counter in the item delivery data
 257          *
 258          * @param string $cmd  Command
 259          * @param array  $item Item array
 260          */
 261         private static function setFailedQueue(string $cmd, array $item)
 262         {
 263                 if (!in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 264                         return;
 265                 }
 266
 267                 Model\Post\DeliveryData::incrementQueueFailed($item['uri-id'] ?? $item['id']);
 268         }
 269
 270         /**
 271          * Deliver content via DFRN
 272          *
 273          * @param string  $cmd             Command
 274          * @param array   $contact         Contact record of the receiver
 275          * @param array   $owner           Owner record of the sender
 276          * @param array   $items           Item record of the content and the parent
 277          * @param array   $target_item     Item record of the content
 278          * @param boolean $public_message  Is the content public?
 279          * @param boolean $top_level       Is it a thread starter?
 280          * @param boolean $followup        Is it an answer to a remote post?
 281          * @param int     $server_protocol The protocol of the server
 282          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 283          * @throws \ImagickException
 284          */
 285         private static function deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup, $server_protocol)
 286         {
 287                 // Transmit Diaspora reshares via Diaspora if the Friendica contact support Diaspora
 288                 if (Diaspora::isReshare($target_item['body']) && !empty(FContact::getByURL($contact['addr'], false))) {
 289                         Logger::info('Reshare will be transmitted via Diaspora', ['url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 290                         self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 291                         return;
 292                 }
 293
 294                 Logger::info('Deliver ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' via DFRN to ' . (($contact['addr'] ?? '') ?: $contact['url']));
 295
 296                 if ($cmd == self::MAIL) {
 297                         $item = $target_item;
 298                         $item['body'] = Model\Item::fixPrivatePhotos($item['body'], $owner['uid'], null, $item['contact-id']);
 299                         $atom = DFRN::mail($item, $owner);
 300                 } elseif ($cmd == self::SUGGESTION) {
 301                         $item = $target_item;
 302                         $atom = DFRN::fsuggest($item, $owner);
 303                         DBA::delete('fsuggest', ['id' => $item['id']]);
 304                 } elseif ($cmd == self::RELOCATION) {
 305                         $atom = DFRN::relocate($owner, $owner['uid']);
 306                 } elseif ($followup) {
 307                         $msgitems = [$target_item];
 308                         $atom = DFRN::entries($msgitems, $owner);
 309                 } else {
 310                         if ($target_item['deleted']) {
 311                                 $msgitems = [$target_item];
 312                         } else {
 313                                 $msgitems = [];
 314                                 foreach ($items as $item) {
 315                                         // Only add the parent when we don't delete other items.
 316                                         if (($target_item['id'] == $item['id']) || ($cmd != self::DELETION)) {
 317                                                 $item["entry:comment-allow"] = true;
 318                                                 $item["entry:cid"] = ($top_level ? $contact['id'] : 0);
 319                                                 $msgitems[] = $item;
 320                                         }
 321                                 }
 322                         }
 323                         $atom = DFRN::entries($msgitems, $owner);
 324                 }
 325
 326                 Logger::debug('Notifier entry: ' . $contact["url"] . ' ' . (($target_item['guid'] ?? '') ?: $target_item['id']) . ' entry: ' . $atom);
 327
 328                 // perform local delivery if we are on the same site
 329                 if (Model\Contact::isLocal($contact['url'])) {
 330                         $condition = ['nurl' => Strings::normaliseLink($contact['url']), 'self' => true];
 331                         $target_self = DBA::selectFirst('contact', ['uid'], $condition);
 332                         if (!DBA::isResult($target_self)) {
 333                                 return;
 334                         }
 335                         $target_uid = $target_self['uid'];
 336
 337                         // Check if the user has got this contact
 338                         $cid = Model\Contact::getIdForURL($owner['url'], $target_uid);
 339                         if (!$cid) {
 340                                 // Otherwise there should be a public contact
 341                                 $cid = Model\Contact::getIdForURL($owner['url']);
 342                                 if (!$cid) {
 343                                         return;
 344                                 }
 345                         }
 346
 347                         $target_importer = DFRN::getImporter($cid, $target_uid);
 348                         if (empty($target_importer)) {
 349                                 // This should never happen
 350                                 return;
 351                         }
 352
 353                         DFRN::import($atom, $target_importer, Conversation::PARCEL_LOCAL_DFRN, Conversation::PUSH);
 354
 355                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 356                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::DFRN);
 357                         }
 358
 359                         return;
 360                 }
 361
 362                 $protocol = Model\Post\DeliveryData::DFRN;
 363
 364                 // We don't have a relationship with contacts on a public post.
 365                 // Se we transmit with the new method and via Diaspora as a fallback
 366                 if (!empty($items) && (($items[0]['uid'] == 0) || ($contact['uid'] == 0))) {
 367                         // Transmit in public if it's a relay post
 368                         $public_dfrn = ($contact['contact-type'] == Model\Contact::TYPE_RELAY);
 369
 370                         $deliver_status = DFRN::transmit($owner, $contact, $atom, $public_dfrn);
 371
 372                         // We never spool failed relay deliveries
 373                         if ($public_dfrn) {
 374                                 Logger::info('Relay delivery to ' . $contact["url"] . ' with guid ' . $target_item["guid"] . ' returns ' . $deliver_status);
 375
 376                                 if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 377                                         if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 378                                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 379
 380                                                 Model\GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 381                                         } else {
 382                                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 383                                         }
 384                                 }
 385                                 return;
 386                         }
 387
 388                         if ((($deliver_status < 200) || ($deliver_status > 299)) && (empty($server_protocol) || ($server_protocol == Model\Post\DeliveryData::LEGACY_DFRN))) {
 389                                 // Transmit via Diaspora if not possible via Friendica
 390                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 391                                 return;
 392                         }
 393                 } elseif ($cmd != self::RELOCATION) {
 394                         // DFRN payload over Diaspora transport layer
 395                         $deliver_status = DFRN::transmit($owner, $contact, $atom);
 396                         if (($deliver_status < 200) && (empty($server_protocol) || ($server_protocol == Model\Post\DeliveryData::LEGACY_DFRN))) {
 397                                 // Legacy DFRN
 398                                 $deliver_status = DFRN::deliver($owner, $contact, $atom);
 399                                 $protocol = Model\Post\DeliveryData::LEGACY_DFRN;
 400                         }
 401                 } else {
 402                         $deliver_status = DFRN::deliver($owner, $contact, $atom);
 403                         $protocol = Model\Post\DeliveryData::LEGACY_DFRN;
 404                 }
 405
 406                 Logger::info('DFRN Delivery', ['cmd' => $cmd, 'url' => $contact['url'], 'guid' => ($target_item['guid'] ?? '') ?: $target_item['id'], 'return' => $deliver_status]);
 407
 408                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 409                         // We successfully delivered a message, the contact is alive
 410                         Model\Contact::unmarkForArchival($contact);
 411
 412                         Model\GServer::setProtocol($contact['gsid'] ?? 0, $protocol);
 413
 414                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 415                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], $protocol);
 416                         }
 417                 } else {
 418                         // The message could not be delivered. We mark the contact as "dead"
 419                         Model\Contact::markForArchival($contact);
 420
 421                         Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 422                         if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 423                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 424                         }
 425                 }
 426         }
 427
 428         /**
 429          * Deliver content via Diaspora
 430          *
 431          * @param string  $cmd            Command
 432          * @param array   $contact        Contact record of the receiver
 433          * @param array   $owner          Owner record of the sender
 434          * @param array   $items          Item record of the content and the parent
 435          * @param array   $target_item    Item record of the content
 436          * @param boolean $public_message Is the content public?
 437          * @param boolean $top_level      Is it a thread starter?
 438          * @param boolean $followup       Is it an answer to a remote post?
 439          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 440          * @throws \ImagickException
 441          */
 442         private static function deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup)
 443         {
 444                 // We don't treat Forum posts as "wall-to-wall" to be able to post them via Diaspora
 445                 $walltowall = $top_level && ($owner['id'] != $items[0]['contact-id']) & ($owner['account-type'] != Model\User::ACCOUNT_TYPE_COMMUNITY);
 446
 447                 if ($public_message) {
 448                         $loc = 'public batch ' . $contact['batch'];
 449                 } else {
 450                         $loc = $contact['addr'];
 451                 }
 452
 453                 Logger::notice('Deliver via Diaspora', ['target' => $target_item['id'], 'guid' => $target_item['guid'], 'to' => $loc]);
 454
 455                 if (DI::config()->get('system', 'dfrn_only') || !DI::config()->get('system', 'diaspora_enabled')) {
 456                         return;
 457                 }
 458
 459                 if ($cmd == self::MAIL) {
 460                         Diaspora::sendMail($target_item, $owner, $contact);
 461                         return;
 462                 }
 463
 464                 if ($cmd == self::SUGGESTION) {
 465                         return;
 466                 }
 467
 468                 if (!$contact['pubkey'] && !$public_message) {
 469                         return;
 470                 }
 471
 472                 if ($cmd == self::RELOCATION) {
 473                         $deliver_status = Diaspora::sendAccountMigration($owner, $contact, $owner['uid']);
 474                 } elseif ($target_item['deleted'] && (($target_item['uri'] === $target_item['parent-uri']) || $followup)) {
 475                         // top-level retraction
 476                         Logger::log('diaspora retract: ' . $loc);
 477                         $deliver_status = Diaspora::sendRetraction($target_item, $owner, $contact, $public_message);
 478                 } elseif ($followup) {
 479                         // send comments and likes to owner to relay
 480                         Logger::log('diaspora followup: ' . $loc);
 481                         $deliver_status = Diaspora::sendFollowup($target_item, $owner, $contact, $public_message);
 482                 } elseif ($target_item['uri'] !== $target_item['parent-uri']) {
 483                         // we are the relay - send comments, likes and relayable_retractions to our conversants
 484                         Logger::log('diaspora relay: ' . $loc);
 485                         $deliver_status = Diaspora::sendRelay($target_item, $owner, $contact, $public_message);
 486                 } elseif ($top_level && !$walltowall) {
 487                         // currently no workable solution for sending walltowall
 488                         Logger::log('diaspora status: ' . $loc);
 489                         $deliver_status = Diaspora::sendStatus($target_item, $owner, $contact, $public_message);
 490                 } else {
 491                         Logger::log('Unknown mode ' . $cmd . ' for ' . $loc);
 492                         return;
 493                 }
 494
 495                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 496                         // We successfully delivered a message, the contact is alive
 497                         Model\Contact::unmarkForArchival($contact);
 498
 499                         Model\GServer::setProtocol($contact['gsid'] ?? 0, Model\Post\DeliveryData::DIASPORA);
 500
 501                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 502                                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::DIASPORA);
 503                         }
 504                 } else {
 505                         // The message could not be delivered. We mark the contact as "dead"
 506                         Model\Contact::markForArchival($contact);
 507
 508                         // When it is delivered to the public endpoint, we do mark the relay contact for archival as well
 509                         if ($public_message) {
 510                                 Relay::markForArchival($contact);
 511                         }
 512
 513                         if (empty($contact['contact-type']) || ($contact['contact-type'] != Model\Contact::TYPE_RELAY)) {
 514                                 Logger::info('Delivery failed: defer message', ['id' => ($target_item['guid'] ?? '') ?: $target_item['id']]);
 515                                 // defer message for redelivery
 516                                 if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 517                                         Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 518                                 }
 519                         } elseif (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 520                                 Model\Post\DeliveryData::incrementQueueFailed($target_item['uri-id']);
 521                         }
 522                 }
 523         }
 524
 525         /**
 526          * Deliver content via mail
 527          *
 528          * @param string $cmd         Command
 529          * @param array  $contact     Contact record of the receiver
 530          * @param array  $owner       Owner record of the sender
 531          * @param array  $target_item Item record of the content
 532          * @param array  $thr_parent  Item record of the direct parent in the thread
 533          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 534          * @throws \ImagickException
 535          */
 536         private static function deliverMail($cmd, $contact, $owner, $target_item, $thr_parent)
 537         {
 538                 if (DI::config()->get('system','dfrn_only')) {
 539                         return;
 540                 }
 541
 542                 $addr = $contact['addr'];
 543                 if (!strlen($addr)) {
 544                         return;
 545                 }
 546
 547                 if (!in_array($cmd, [self::POST, self::POKE])) {
 548                         return;
 549                 }
 550
 551                 if ($target_item['verb'] != Activity::POST) {
 552                         return;
 553                 }
 554
 555                 if (!empty($thr_parent['object'])) {
 556                         $data = json_decode($thr_parent['object'], true);
 557                         if (!empty($data['reply_to'])) {
 558                                 $addr = $data['reply_to'][0]['mailbox'] . '@' . $data['reply_to'][0]['host'];
 559                                 Logger::info('Use "reply-to" address of the thread parent', ['addr' => $addr]);
 560                         } elseif (!empty($data['from'])) {
 561                                 $addr = $data['from'][0]['mailbox'] . '@' . $data['from'][0]['host'];
 562                                 Logger::info('Use "from" address of the thread parent', ['addr' => $addr]);
 563                         }
 564                 }
 565
 566                 $local_user = DBA::selectFirst('user', [], ['uid' => $owner['uid']]);
 567                 if (!DBA::isResult($local_user)) {
 568                         return;
 569                 }
 570
 571                 Logger::info('About to deliver via mail', ['guid' => $target_item['guid'], 'to' => $addr]);
 572
 573                 $reply_to = '';
 574                 $mailacct = DBA::selectFirst('mailacct', ['reply_to'], ['uid' => $owner['uid']]);
 575                 if (DBA::isResult($mailacct) && !empty($mailacct['reply_to'])) {
 576                         $reply_to = $mailacct['reply_to'];
 577                 }
 578
 579                 $subject  = ($target_item['title'] ? Email::encodeHeader($target_item['title'], 'UTF-8') : DI::l10n()->t("\x28no subject\x29"));
 580
 581                 // only expose our real email address to true friends
 582
 583                 if (($contact['rel'] == Model\Contact::FRIEND) && !$contact['blocked']) {
 584                         if ($reply_to) {
 585                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $reply_to . '>' . "\n";
 586                                 $headers .= 'Sender: ' . $local_user['email'] . "\n";
 587                         } else {
 588                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $local_user['email'] . '>' . "\n";
 589                         }
 590                 } else {
 591                         $sender = DI::config()->get('config', 'sender_email', 'noreply@' . DI::baseUrl()->getHostname());
 592                         $headers  = 'From: '. Email::encodeHeader($local_user['username'], 'UTF-8') . ' <' . $sender . '>' . "\n";
 593                 }
 594
 595                 $headers .= 'Message-Id: <' . Email::iri2msgid($target_item['uri']) . '>' . "\n";
 596
 597                 if ($target_item['uri'] !== $target_item['parent-uri']) {
 598                         $headers .= 'References: <' . Email::iri2msgid($target_item['parent-uri']) . '>';
 599
 600                         // Export more references on deeper nested threads
 601                         if (($target_item['thr-parent'] != '') && ($target_item['thr-parent'] != $target_item['parent-uri'])) {
 602                                 $headers .= ' <' . Email::iri2msgid($target_item['thr-parent']) . '>';
 603                         }
 604
 605                         $headers .= "\n";
 606
 607                         if (empty($target_item['title'])) {
 608                                 $condition = ['uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 609                                 $title = Model\Post::selectFirst(['title'], $condition);
 610
 611                                 if (DBA::isResult($title) && ($title['title'] != '')) {
 612                                         $subject = $title['title'];
 613                                 } else {
 614                                         $condition = ['parent-uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 615                                         $title = Model\Post::selectFirst(['title'], $condition);
 616
 617                                         if (DBA::isResult($title) && ($title['title'] != '')) {
 618                                                 $subject = $title['title'];
 619                                         }
 620                                 }
 621                         }
 622
 623                         if (strncasecmp($subject, 'RE:', 3)) {
 624                                 $subject = 'Re: ' . $subject;
 625                         }
 626                 }
 627
 628                 Email::send($addr, $subject, $headers, $target_item);
 629
 630                 Model\Post\DeliveryData::incrementQueueDone($target_item['uri-id'], Model\Post\DeliveryData::MAIL);
 631
 632                 Logger::info('Delivered via mail', ['guid' => $target_item['guid'], 'to' => $addr, 'subject' => $subject]);
 633         }
 634 }