src/Worker/Delivery.php

   1 <?php
   2 /**
   3  * @file src/Worker/Delivery.php
   4  */
   5 namespace Friendica\Worker;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Core\Config;
   9 use Friendica\Core\L10n;
  10 use Friendica\Core\Logger;
  11 use Friendica\Core\Protocol;
  12 use Friendica\Core\System;
  13 use Friendica\Database\DBA;
  14 use Friendica\Model;
  15 use Friendica\Protocol\DFRN;
  16 use Friendica\Protocol\Diaspora;
  17 use Friendica\Protocol\Email;
  18 use Friendica\Util\Strings;
  19 use Friendica\Util\Network;
  20 use Friendica\Core\Worker;
  21
  22 class Delivery extends BaseObject
  23 {
  24         const MAIL          = 'mail';
  25         const SUGGESTION    = 'suggest';
  26         const RELOCATION    = 'relocate';
  27         const DELETION      = 'drop';
  28         const POST          = 'wall-new';
  29         const POKE          = 'poke';
  30         const UPLINK        = 'uplink';
  31         const REMOVAL       = 'removeme';
  32         const PROFILEUPDATE = 'profileupdate';
  33
  34         public static function execute($cmd, $target_id, $contact_id)
  35         {
  36                 Logger::info('Invoked', ['cmd' => $cmd, 'target' => $target_id, 'contact' => $contact_id]);
  37
  38                 $top_level = false;
  39                 $followup = false;
  40                 $public_message = false;
  41
  42                 $items = [];
  43                 if ($cmd == self::MAIL) {
  44                         $target_item = DBA::selectFirst('mail', [], ['id' => $target_id]);
  45                         if (!DBA::isResult($target_item)) {
  46                                 self::setFailedQueue($cmd, $target_id);
  47                                 return;
  48                         }
  49                         $uid = $target_item['uid'];
  50                 } elseif ($cmd == self::SUGGESTION) {
  51                         $target_item = DBA::selectFirst('fsuggest', [], ['id' => $target_id]);
  52                         if (!DBA::isResult($target_item)) {
  53                                 self::setFailedQueue($cmd, $target_id);
  54                                 return;
  55                         }
  56                         $uid = $target_item['uid'];
  57                 } elseif ($cmd == self::RELOCATION) {
  58                         $uid = $target_id;
  59                         $target_item = [];
  60                 } else {
  61                         $item = Model\Item::selectFirst(['parent'], ['id' => $target_id]);
  62                         if (!DBA::isResult($item) || empty($item['parent'])) {
  63                                 self::setFailedQueue($cmd, $target_id);
  64                                 return;
  65                         }
  66                         $parent_id = intval($item['parent']);
  67
  68                         $condition = ['id' => [$target_id, $parent_id], 'visible' => true, 'moderated' => false];
  69                         $params = ['order' => ['id']];
  70                         $itemdata = Model\Item::select([], $condition, $params);
  71
  72                         while ($item = Model\Item::fetch($itemdata)) {
  73                                 if ($item['id'] == $parent_id) {
  74                                         $parent = $item;
  75                                 }
  76                                 if ($item['id'] == $target_id) {
  77                                         $target_item = $item;
  78                                 }
  79                                 $items[] = $item;
  80                         }
  81                         DBA::close($itemdata);
  82
  83                         if (empty($target_item)) {
  84                                 Logger::log('Item ' . $target_id . "wasn't found. Quitting here.");
  85                                 self::setFailedQueue($cmd, $target_id);
  86                                 return;
  87                         }
  88
  89                         if (empty($parent)) {
  90                                 Logger::log('Parent ' . $parent_id . ' for item ' . $target_id . "wasn't found. Quitting here.");
  91                                 self::setFailedQueue($cmd, $target_id);
  92                                 return;
  93                         }
  94
  95                         if (!empty($target_item['contact-uid'])) {
  96                                 $uid = $target_item['contact-uid'];
  97                         } elseif (!empty($target_item['uid'])) {
  98                                 $uid = $target_item['uid'];
  99                         } else {
 100                                 Logger::log('Only public users for item ' . $target_id, Logger::DEBUG);
 101                                 self::setFailedQueue($cmd, $target_id);
 102                                 return;
 103                         }
 104
 105                         if (!empty($contact_id) && Model\Contact::isArchived($contact_id)) {
 106                                 Logger::info('Contact is archived', ['id' => $contact_id, 'cmd' => $cmd, 'item' => $target_item['id']]);
 107                                 self::setFailedQueue($cmd, $target_id);
 108                                 return;
 109                         }
 110
 111                         // avoid race condition with deleting entries
 112                         if ($items[0]['deleted']) {
 113                                 foreach ($items as $item) {
 114                                         $item['deleted'] = 1;
 115                                 }
 116                         }
 117
 118                         // When commenting too fast after delivery, a post wasn't recognized as top level post.
 119                         // The count then showed more than one entry. The additional check should help.
 120                         // The check for the "count" should be superfluous, but I'm not totally sure by now, so we keep it.
 121                         if ((($parent['id'] == $target_id) || (count($items) == 1)) && ($parent['uri'] === $parent['parent-uri'])) {
 122                                 Logger::log('Top level post');
 123                                 $top_level = true;
 124                         }
 125
 126                         // This is IMPORTANT!!!!
 127
 128                         // We will only send a "notify owner to relay" or followup message if the referenced post
 129                         // originated on our system by virtue of having our hostname somewhere
 130                         // in the URI, AND it was a comment (not top_level) AND the parent originated elsewhere.
 131                         // if $parent['wall'] == 1 we will already have the parent message in our array
 132                         // and we will relay the whole lot.
 133
 134                         $localhost = self::getApp()->getHostName();
 135                         if (strpos($localhost, ':')) {
 136                                 $localhost = substr($localhost, 0, strpos($localhost, ':'));
 137                         }
 138                         /**
 139                          *
 140                          * Be VERY CAREFUL if you make any changes to the following line. Seemingly innocuous changes
 141                          * have been known to cause runaway conditions which affected several servers, along with
 142                          * permissions issues.
 143                          *
 144                          */
 145
 146                         if (!$top_level && ($parent['wall'] == 0) && stristr($target_item['uri'], $localhost)) {
 147                                 Logger::log('Followup ' . $target_item["guid"], Logger::DEBUG);
 148                                 // local followup to remote post
 149                                 $followup = true;
 150                         }
 151
 152                         if (empty($parent['allow_cid'])
 153                                 && empty($parent['allow_gid'])
 154                                 && empty($parent['deny_cid'])
 155                                 && empty($parent['deny_gid'])
 156                                 && !$parent["private"]) {
 157                                 $public_message = true;
 158                         }
 159                 }
 160
 161                 if (empty($items)) {
 162                         Logger::log('No delivery data for  ' . $cmd . ' - Item ID: ' .$target_id . ' - Contact ID: ' . $contact_id);
 163                 }
 164
 165                 $owner = Model\User::getOwnerDataById($uid);
 166                 if (!DBA::isResult($owner)) {
 167                         self::setFailedQueue($cmd, $target_id);
 168                         return;
 169                 }
 170
 171                 // We don't deliver our items to blocked or pending contacts, and not to ourselves either
 172                 $contact = DBA::selectFirst('contact', [],
 173                         ['id' => $contact_id, 'blocked' => false, 'pending' => false, 'self' => false]
 174                 );
 175                 if (!DBA::isResult($contact)) {
 176                         self::setFailedQueue($cmd, $target_id);
 177                         return;
 178                 }
 179
 180                 if (Network::isUrlBlocked($contact['url'])) {
 181                         self::setFailedQueue($cmd, $target_id);
 182                         return;
 183                 }
 184
 185                 // Transmit via Diaspora if the thread had started as Diaspora post
 186                 // This is done since the uri wouldn't match (Diaspora doesn't transmit it)
 187                 if (isset($parent) && ($parent['network'] == Protocol::DIASPORA)) {
 188                         $contact['network'] = Protocol::DIASPORA;
 189                 }
 190
 191                 Logger::notice('Delivering', ['cmd' => $cmd, 'target' => $target_id, 'followup' => $followup, 'network' => $contact['network']]);
 192
 193                 switch ($contact['network']) {
 194                         case Protocol::DFRN:
 195                                 self::deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 196                                 break;
 197
 198                         case Protocol::DIASPORA:
 199                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 200                                 break;
 201
 202                         case Protocol::MAIL:
 203                                 self::deliverMail($cmd, $contact, $owner, $target_item);
 204                                 break;
 205
 206                         default:
 207                                 break;
 208                 }
 209
 210                 return;
 211         }
 212
 213         /**
 214          * Increased the "failed" counter in the item delivery data
 215          *
 216          * @param string  $cmd Command
 217          * @param integer $id  Item id
 218          */
 219         private static function setFailedQueue(string $cmd, int $id)
 220         {
 221                 if (!in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 222                         return;
 223                 }
 224
 225                 Model\ItemDeliveryData::incrementQueueFailed($id);
 226         }
 227
 228         /**
 229          * @brief Deliver content via DFRN
 230          *
 231          * @param string  $cmd            Command
 232          * @param array   $contact        Contact record of the receiver
 233          * @param array   $owner          Owner record of the sender
 234          * @param array   $items          Item record of the content and the parent
 235          * @param array   $target_item    Item record of the content
 236          * @param boolean $public_message Is the content public?
 237          * @param boolean $top_level      Is it a thread starter?
 238          * @param boolean $followup       Is it an answer to a remote post?
 239          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 240          * @throws \ImagickException
 241          */
 242         private static function deliverDFRN($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup)
 243         {
 244                 Logger::log('Deliver ' . defaults($target_item, 'guid', $target_item['id']) . ' via DFRN to ' . (empty($contact['addr']) ? $contact['url'] : $contact['addr']));
 245
 246                 if ($cmd == self::MAIL) {
 247                         $item = $target_item;
 248                         $item['body'] = Model\Item::fixPrivatePhotos($item['body'], $owner['uid'], null, $item['contact-id']);
 249                         $atom = DFRN::mail($item, $owner);
 250                 } elseif ($cmd == self::SUGGESTION) {
 251                         $item = $target_item;
 252                         $atom = DFRN::fsuggest($item, $owner);
 253                         DBA::delete('fsuggest', ['id' => $item['id']]);
 254                 } elseif ($cmd == self::RELOCATION) {
 255                         $atom = DFRN::relocate($owner, $owner['uid']);
 256                 } elseif ($followup) {
 257                         $msgitems = [$target_item];
 258                         $atom = DFRN::entries($msgitems, $owner);
 259                 } else {
 260                         $msgitems = [];
 261                         foreach ($items as $item) {
 262                                 // Only add the parent when we don't delete other items.
 263                                 if (($target_item['id'] == $item['id']) || ($cmd != self::DELETION)) {
 264                                         $item["entry:comment-allow"] = true;
 265                                         $item["entry:cid"] = ($top_level ? $contact['id'] : 0);
 266                                         $msgitems[] = $item;
 267                                 }
 268                         }
 269                         $atom = DFRN::entries($msgitems, $owner);
 270                 }
 271
 272                 Logger::log('Notifier entry: ' . $contact["url"] . ' ' . defaults($target_item, 'guid', $target_item['id']) . ' entry: ' . $atom, Logger::DATA);
 273
 274                 $basepath =  implode('/', array_slice(explode('/', $contact['url']), 0, 3));
 275
 276                 // perform local delivery if we are on the same site
 277
 278                 if (Strings::compareLink($basepath, System::baseUrl())) {
 279                         $condition = ['nurl' => Strings::normaliseLink($contact['url']), 'self' => true];
 280                         $target_self = DBA::selectFirst('contact', ['uid'], $condition);
 281                         if (!DBA::isResult($target_self)) {
 282                                 return;
 283                         }
 284                         $target_uid = $target_self['uid'];
 285
 286                         // Check if the user has got this contact
 287                         $cid = Model\Contact::getIdForURL($owner['url'], $target_uid);
 288                         if (!$cid) {
 289                                 // Otherwise there should be a public contact
 290                                 $cid = Model\Contact::getIdForURL($owner['url']);
 291                                 if (!$cid) {
 292                                         return;
 293                                 }
 294                         }
 295
 296                         $target_importer = DFRN::getImporter($cid, $target_uid);
 297                         if (empty($target_importer)) {
 298                                 // This should never happen
 299                                 return;
 300                         }
 301
 302                         DFRN::import($atom, $target_importer);
 303
 304                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 305                                 Model\ItemDeliveryData::incrementQueueDone($target_item['id'], Model\ItemDeliveryData::DFRN);
 306                         }
 307
 308                         return;
 309                 }
 310
 311                 $protocol = Model\ItemDeliveryData::DFRN;
 312
 313                 // We don't have a relationship with contacts on a public post.
 314                 // Se we transmit with the new method and via Diaspora as a fallback
 315                 if (!empty($items) && (($items[0]['uid'] == 0) || ($contact['uid'] == 0))) {
 316                         // Transmit in public if it's a relay post
 317                         $public_dfrn = ($contact['contact-type'] == Model\Contact::TYPE_RELAY);
 318
 319                         $deliver_status = DFRN::transmit($owner, $contact, $atom, $public_dfrn);
 320
 321                         // We never spool failed relay deliveries
 322                         if ($public_dfrn) {
 323                                 Logger::log('Relay delivery to ' . $contact["url"] . ' with guid ' . $target_item["guid"] . ' returns ' . $deliver_status);
 324
 325                                 if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 326                                         if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 327                                                 Model\ItemDeliveryData::incrementQueueDone($target_item['id'], $protocol);
 328                                         } else {
 329                                                 Model\ItemDeliveryData::incrementQueueFailed($target_item['id']);
 330                                         }
 331                                 }
 332                                 return;
 333                         }
 334
 335                         if (($deliver_status < 200) || ($deliver_status > 299)) {
 336                                 // Transmit via Diaspora if not possible via Friendica
 337                                 self::deliverDiaspora($cmd, $contact, $owner, $items, $target_item, $public_message, $top_level, $followup);
 338                                 return;
 339                         }
 340                 } elseif ($cmd != self::RELOCATION) {
 341                         // DFRN payload over Diaspora transport layer
 342                         $deliver_status = DFRN::transmit($owner, $contact, $atom);
 343                         if ($deliver_status < 200) {
 344                                 // Legacy DFRN
 345                                 $deliver_status = DFRN::deliver($owner, $contact, $atom);
 346                                 $protocol = Model\ItemDeliveryData::LEGACY_DFRN;
 347                         }
 348                 } else {
 349                         $deliver_status = DFRN::deliver($owner, $contact, $atom);
 350                         $protocol = Model\ItemDeliveryData::LEGACY_DFRN;
 351                 }
 352
 353                 Logger::info('DFRN Delivery', ['cmd' => $cmd, 'url' => $contact['url'], 'guid' => defaults($target_item, 'guid', $target_item['id']), 'return' => $deliver_status]);
 354
 355                 if (($deliver_status >= 200) && ($deliver_status <= 299)) {
 356                         // We successfully delivered a message, the contact is alive
 357                         Model\Contact::unmarkForArchival($contact);
 358
 359                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 360                                 Model\ItemDeliveryData::incrementQueueDone($target_item['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' => defaults($target_item, 'guid', $target_item['id'])]);
 367                         if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 368                                 Model\ItemDeliveryData::incrementQueueFailed($target_item['id']);
 369                         }
 370                 }
 371         }
 372
 373         /**
 374          * @brief 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' => $loc]);
 399
 400                 if (Config::get('system', 'dfrn_only') || !Config::get('system', 'diaspora_enabled')) {
 401                         return;
 402                 }
 403
 404                 if ($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::log('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::log('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::log('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::log('diaspora status: ' . $loc);
 434                         $deliver_status = Diaspora::sendStatus($target_item, $owner, $contact, $public_message);
 435                 } else {
 436                         Logger::log('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                         if (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 445                                 Model\ItemDeliveryData::incrementQueueDone($target_item['id'], Model\ItemDeliveryData::DIASPORA);
 446                         }
 447                 } else {
 448                         // The message could not be delivered. We mark the contact as "dead"
 449                         Model\Contact::markForArchival($contact);
 450
 451                         // When it is delivered to the public endpoint, we do mark the relay contact for archival as well
 452                         if ($public_message) {
 453                                 Diaspora::markRelayForArchival($contact);
 454                         }
 455
 456                         if (empty($contact['contact-type']) || ($contact['contact-type'] != Model\Contact::TYPE_RELAY)) {
 457                                 Logger::info('Delivery failed: defer message', ['id' => defaults($target_item, 'guid', $target_item['id'])]);
 458                                 // defer message for redelivery
 459                                 if (!Worker::defer() && in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 460                                         Model\ItemDeliveryData::incrementQueueFailed($target_item['id']);
 461                                 }
 462                         } elseif (in_array($cmd, [Delivery::POST, Delivery::POKE])) {
 463                                 Model\ItemDeliveryData::incrementQueueFailed($target_item['id']);
 464                         }
 465                 }
 466         }
 467
 468         /**
 469          * @brief Deliver content via mail
 470          *
 471          * @param string $cmd         Command
 472          * @param array  $contact     Contact record of the receiver
 473          * @param array  $owner       Owner record of the sender
 474          * @param array  $target_item Item record of the content
 475          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 476          * @throws \ImagickException
 477          */
 478         private static function deliverMail($cmd, $contact, $owner, $target_item)
 479         {
 480                 if (Config::get('system','dfrn_only')) {
 481                         return;
 482                 }
 483                 // WARNING: does not currently convert to RFC2047 header encodings, etc.
 484
 485                 $addr = $contact['addr'];
 486                 if (!strlen($addr)) {
 487                         return;
 488                 }
 489
 490                 if (!in_array($cmd, [self::POST, self::POKE])) {
 491                         return;
 492                 }
 493
 494                 $local_user = DBA::selectFirst('user', [], ['uid' => $owner['uid']]);
 495                 if (!DBA::isResult($local_user)) {
 496                         return;
 497                 }
 498
 499                 Logger::log('Deliver ' . $target_item["guid"] . ' via mail to ' . $contact['addr']);
 500
 501                 $reply_to = '';
 502                 $mailacct = DBA::selectFirst('mailacct', ['reply_to'], ['uid' => $owner['uid']]);
 503                 if (DBA::isResult($mailacct) && !empty($mailacct['reply_to'])) {
 504                         $reply_to = $mailacct['reply_to'];
 505                 }
 506
 507                 $subject  = ($target_item['title'] ? Email::encodeHeader($target_item['title'], 'UTF-8') : L10n::t("\x28no subject\x29"));
 508
 509                 // only expose our real email address to true friends
 510
 511                 if (($contact['rel'] == Model\Contact::FRIEND) && !$contact['blocked']) {
 512                         if ($reply_to) {
 513                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8') . ' <' . $reply_to.'>' . "\n";
 514                                 $headers .= 'Sender: ' . $local_user['email'] . "\n";
 515                         } else {
 516                                 $headers  = 'From: ' . Email::encodeHeader($local_user['username'],'UTF-8').' <' . $local_user['email'] . '>' . "\n";
 517                         }
 518                 } else {
 519                         $headers  = 'From: '. Email::encodeHeader($local_user['username'], 'UTF-8') . ' <noreply@' . self::getApp()->getHostName() . '>' . "\n";
 520                 }
 521
 522                 $headers .= 'Message-Id: <' . Email::iri2msgid($target_item['uri']) . '>' . "\n";
 523
 524                 if ($target_item['uri'] !== $target_item['parent-uri']) {
 525                         $headers .= "References: <" . Email::iri2msgid($target_item["parent-uri"]) . ">";
 526
 527                         // If Threading is enabled, write down the correct parent
 528                         if (($target_item["thr-parent"] != "") && ($target_item["thr-parent"] != $target_item["parent-uri"])) {
 529                                 $headers .= " <".Email::iri2msgid($target_item["thr-parent"]).">";
 530                         }
 531
 532                         $headers .= "\n";
 533
 534                         if (empty($target_item['title'])) {
 535                                 $condition = ['uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 536                                 $title = Model\Item::selectFirst(['title'], $condition);
 537
 538                                 if (DBA::isResult($title) && ($title['title'] != '')) {
 539                                         $subject = $title['title'];
 540                                 } else {
 541                                         $condition = ['parent-uri' => $target_item['parent-uri'], 'uid' => $owner['uid']];
 542                                         $title = Model\Item::selectFirst(['title'], $condition);
 543
 544                                         if (DBA::isResult($title) && ($title['title'] != '')) {
 545                                                 $subject = $title['title'];
 546                                         }
 547                                 }
 548                         }
 549
 550                         if (strncasecmp($subject, 'RE:', 3)) {
 551                                 $subject = 'Re: ' . $subject;
 552                         }
 553                 }
 554
 555                 Email::send($addr, $subject, $headers, $target_item);
 556         }
 557 }