src/Model/Item.php

   1 <?php
   2
   3 /**
   4  * @file src/Model/Item.php
   5  */
   6
   7 namespace Friendica\Model;
   8
   9 use Friendica\BaseObject;
  10 use Friendica\Content\Text;
  11 use Friendica\Core\Addon;
  12 use Friendica\Core\Config;
  13 use Friendica\Core\L10n;
  14 use Friendica\Core\PConfig;
  15 use Friendica\Core\System;
  16 use Friendica\Core\Worker;
  17 use Friendica\Database\DBM;
  18 use Friendica\Model\Contact;
  19 use Friendica\Model\Conversation;
  20 use Friendica\Model\Group;
  21 use Friendica\Model\Term;
  22 use Friendica\Object\Image;
  23 use Friendica\Protocol\Diaspora;
  24 use Friendica\Protocol\OStatus;
  25 use Friendica\Util\DateTimeFormat;
  26 use Friendica\Util\XML;
  27 use dba;
  28 use Text_LanguageDetect;
  29
  30 require_once 'boot.php';
  31 require_once 'include/items.php';
  32 require_once 'include/text.php';
  33
  34 class Item extends BaseObject
  35 {
  36         // Field list that is used to display the items
  37         const DISPLAY_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network',
  38                         'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  39                         'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'attach',
  40                         'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  41                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  42                         'author-id', 'author-link', 'author-name', 'author-avatar',
  43                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar',
  44                         'contact-id', 'contact-link', 'contact-name', 'contact-avatar',
  45                         'writable', 'self', 'cid', 'alias',
  46                         'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  47                         'event-summary', 'event-desc', 'event-location', 'event-type',
  48                         'event-nofinish', 'event-adjust', 'event-ignore', 'event-id'];
  49
  50         // Field list that is used to deliver items via the protocols
  51         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid',
  52                         'created', 'edited', 'verb', 'object-type', 'object', 'target',
  53                         'private', 'title', 'body', 'location', 'coord', 'app',
  54                         'attach', 'tag', 'bookmark', 'deleted', 'extid',
  55                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  56                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  57                         'signed_text', 'signature', 'signer'];
  58
  59         const CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
  60                         'coord', 'app', 'rendered-hash', 'rendered-html',
  61                         'object-type', 'object', 'target-type', 'target'];
  62
  63         /**
  64          * @brief Fetch a single item row
  65          *
  66          * @param mixed $stmt statement object
  67          * @return array current row
  68          */
  69         public static function fetch($stmt)
  70         {
  71                 $row = dba::fetch($stmt);
  72
  73                 // Fetch data from the item-content table whenever there is content there
  74                 foreach (self::CONTENT_FIELDLIST as $field) {
  75                         if (isset($row[$field]) && !empty($row['item-content-' . $field])) {
  76                                 $row[$field] = $row['item-content-' . $field];
  77                                 unset($row['item-content-' . $field]);
  78                         }
  79                 }
  80
  81                 // We prefer the data from the user's contact over the public one
  82                 if (!empty($row['author-link']) && !empty($row['contact-link']) &&
  83                         ($row['author-link'] == $row['contact-link'])) {
  84                         if (isset($row['author-avatar']) && !empty($row['contact-avatar'])) {
  85                                 $row['author-avatar'] = $row['contact-avatar'];
  86                         }
  87                         if (isset($row['author-name']) && !empty($row['contact-name'])) {
  88                                 $row['author-name'] = $row['contact-name'];
  89                         }
  90                 }
  91
  92                 if (!empty($row['owner-link']) && !empty($row['contact-link']) &&
  93                         ($row['owner-link'] == $row['contact-link'])) {
  94                         if (isset($row['owner-avatar']) && !empty($row['contact-avatar'])) {
  95                                 $row['owner-avatar'] = $row['contact-avatar'];
  96                         }
  97                         if (isset($row['owner-name']) && !empty($row['contact-name'])) {
  98                                 $row['owner-name'] = $row['contact-name'];
  99                         }
 100                 }
 101
 102                 // We can always comment on posts from these networks
 103                 if (isset($row['writable']) && !empty($row['network']) &&
 104                         in_array($row['network'], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS])) {
 105                         $row['writable'] = true;
 106                 }
 107
 108                 return $row;
 109         }
 110
 111         /**
 112          * @brief Fills an array with data from an item query
 113          *
 114          * @param object $stmt statement object
 115          * @return array Data array
 116          */
 117         public static function inArray($stmt, $do_close = true) {
 118                 if (is_bool($stmt)) {
 119                         return $stmt;
 120                 }
 121
 122                 $data = [];
 123                 while ($row = self::fetch($stmt)) {
 124                         $data[] = $row;
 125                 }
 126                 if ($do_close) {
 127                         dba::close($stmt);
 128                 }
 129                 return $data;
 130         }
 131
 132         /**
 133          * Retrieve a single record from the item table for a given user and returns it in an associative array
 134          *
 135          * @brief Retrieve a single record from a table
 136          * @param integer $uid User ID
 137          * @param array  $fields
 138          * @param array  $condition
 139          * @param array  $params
 140          * @return bool|array
 141          * @see dba::select
 142          */
 143         public static function selectFirstForUser($uid, array $selected = [], array $condition = [], $params = [])
 144         {
 145                 $params['uid'] = $uid;
 146
 147                 if (empty($selected)) {
 148                         $selected = Item::DISPLAY_FIELDLIST;
 149                 }
 150
 151                 return self::selectFirst($selected, $condition, $params);
 152         }
 153
 154         /**
 155          * @brief Select rows from the item table for a given user
 156          *
 157          * @param integer $uid User ID
 158          * @param array  $selected  Array of selected fields, empty for all
 159          * @param array  $condition Array of fields for condition
 160          * @param array  $params    Array of several parameters
 161          *
 162          * @return boolean|object
 163          */
 164         public static function selectForUser($uid, array $selected = [], array $condition = [], $params = [])
 165         {
 166                 $params['uid'] = $uid;
 167
 168                 if (empty($selected)) {
 169                         $selected = Item::DISPLAY_FIELDLIST;
 170                 }
 171
 172                 return self::select($selected, $condition, $params);
 173         }
 174
 175         /**
 176          * Retrieve a single record from the item table and returns it in an associative array
 177          *
 178          * @brief Retrieve a single record from a table
 179          * @param array  $fields
 180          * @param array  $condition
 181          * @param array  $params
 182          * @return bool|array
 183          * @see dba::select
 184          */
 185         public static function selectFirst(array $fields = [], array $condition = [], $params = [])
 186         {
 187                 $params['limit'] = 1;
 188
 189                 $result = self::select($fields, $condition, $params);
 190
 191                 if (is_bool($result)) {
 192                         return $result;
 193                 } else {
 194                         $row = self::fetch($result);
 195                         dba::close($result);
 196                         return $row;
 197                 }
 198         }
 199
 200         /**
 201          * @brief Select rows from the item table
 202          *
 203          * @param array  $selected  Array of selected fields, empty for all
 204          * @param array  $condition Array of fields for condition
 205          * @param array  $params    Array of several parameters
 206          *
 207          * @return boolean|object
 208          */
 209         public static function select(array $selected = [], array $condition = [], $params = [])
 210         {
 211                 $uid = 0;
 212                 $usermode = false;
 213
 214                 if (isset($params['uid'])) {
 215                         $uid = $params['uid'];
 216                         $usermode = true;
 217                 }
 218
 219                 $fields = self::fieldlist($selected);
 220
 221                 $select_fields = self::constructSelectFields($fields, $selected);
 222
 223                 $condition_string = dba::buildCondition($condition);
 224
 225                 $condition_string = self::addTablesToFields($condition_string, $fields);
 226
 227                 if ($usermode) {
 228                         $condition_string = $condition_string . ' AND ' . self::condition(false);
 229                 }
 230
 231                 $param_string = self::addTablesToFields(dba::buildParameter($params), $fields);
 232
 233                 $table = "`item` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, false);
 234
 235                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 236
 237                 return dba::p($sql, $condition);
 238         }
 239
 240         /**
 241          * @brief Select rows from the starting post in the item table
 242          *
 243          * @param integer $uid User ID
 244          * @param array  $fields    Array of selected fields, empty for all
 245          * @param array  $condition Array of fields for condition
 246          * @param array  $params    Array of several parameters
 247          *
 248          * @return boolean|object
 249          */
 250         public static function selectThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 251         {
 252                 $params['uid'] = $uid;
 253
 254                 if (empty($selected)) {
 255                         $selected = Item::DISPLAY_FIELDLIST;
 256                 }
 257
 258                 return self::selectThread($selected, $condition, $params);
 259         }
 260
 261         /**
 262          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 263          *
 264          * @brief Retrieve a single record from a table
 265          * @param integer $uid User ID
 266          * @param array  $selected
 267          * @param array  $condition
 268          * @param array  $params
 269          * @return bool|array
 270          * @see dba::select
 271          */
 272         public static function selectFirstThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 273         {
 274                 $params['uid'] = $uid;
 275
 276                 if (empty($selected)) {
 277                         $selected = Item::DISPLAY_FIELDLIST;
 278                 }
 279
 280                 return self::selectFirstThread($selected, $condition, $params);
 281         }
 282
 283         /**
 284          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 285          *
 286          * @brief Retrieve a single record from a table
 287          * @param array  $fields
 288          * @param array  $condition
 289          * @param array  $params
 290          * @return bool|array
 291          * @see dba::select
 292          */
 293         public static function selectFirstThread(array $fields = [], array $condition = [], $params = [])
 294         {
 295                 $params['limit'] = 1;
 296                 $result = self::selectThread($fields, $condition, $params);
 297
 298                 if (is_bool($result)) {
 299                         return $result;
 300                 } else {
 301                         $row = self::fetch($result);
 302                         dba::close($result);
 303                         return $row;
 304                 }
 305         }
 306
 307         /**
 308          * @brief Select rows from the starting post in the item table
 309          *
 310          * @param array  $selected  Array of selected fields, empty for all
 311          * @param array  $condition Array of fields for condition
 312          * @param array  $params    Array of several parameters
 313          *
 314          * @return boolean|object
 315          */
 316         public static function selectThread(array $selected = [], array $condition = [], $params = [])
 317         {
 318                 $uid = 0;
 319                 $usermode = false;
 320
 321                 if (isset($params['uid'])) {
 322                         $uid = $params['uid'];
 323                         $usermode = true;
 324                 }
 325
 326                 $fields = self::fieldlist($selected);
 327
 328                 $threadfields = ['thread' => ['iid', 'uid', 'contact-id', 'owner-id', 'author-id',
 329                         'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private',
 330                         'pubmail', 'moderated', 'visible', 'starred', 'ignored', 'bookmark',
 331                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'network']];
 332
 333                 $select_fields = self::constructSelectFields($fields, $selected);
 334
 335                 $condition_string = dba::buildCondition($condition);
 336
 337                 $condition_string = self::addTablesToFields($condition_string, $threadfields);
 338                 $condition_string = self::addTablesToFields($condition_string, $fields);
 339
 340                 if ($usermode) {
 341                         $condition_string = $condition_string . ' AND ' . self::condition(true);
 342                 }
 343
 344                 $param_string = dba::buildParameter($params);
 345                 $param_string = self::addTablesToFields($param_string, $threadfields);
 346                 $param_string = self::addTablesToFields($param_string, $fields);
 347
 348                 $table = "`thread` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, true);
 349
 350                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 351
 352                 return dba::p($sql, $condition);
 353         }
 354
 355         /**
 356          * @brief Returns a list of fields that are associated with the item table
 357          *
 358          * @return array field list
 359          */
 360         private static function fieldlist($selected)
 361         {
 362                 $fields = [];
 363
 364                 $fields['item'] = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent', 'guid',
 365                         'contact-id', 'owner-id', 'author-id', 'type', 'wall', 'gravity', 'extid',
 366                         'created', 'edited', 'commented', 'received', 'changed',
 367                         'title', 'body', 'app', 'verb', 'object-type', 'object', 'target-type', 'target',
 368                         'postopts', 'plink', 'resource-id', 'event-id', 'tag', 'attach', 'inform',
 369                         'file', 'location', 'coord', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 370                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 371                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention',
 372                         'rendered-hash', 'rendered-html', 'global', 'content-warning',
 373                         'id' => 'item_id', 'network'];
 374
 375                 $fields['author'] = ['url' => 'author-link', 'name' => 'author-name',
 376                         'thumb' => 'author-avatar', 'nick' => 'author-nick'];
 377
 378                 $fields['owner'] = ['url' => 'owner-link', 'name' => 'owner-name',
 379                         'thumb' => 'owner-avatar', 'nick' => 'owner-nick'];
 380
 381                 $fields['contact'] = ['url' => 'contact-link', 'name' => 'contact-name', 'thumb' => 'contact-avatar',
 382                         'writable', 'self', 'id' => 'cid', 'alias', 'uid' => 'contact-uid',
 383                         'photo', 'name-date', 'uri-date', 'avatar-date', 'thumb', 'dfrn-id'];
 384
 385                 $fields['parent-item'] = ['guid' => 'parent-guid', 'network' => 'parent-network'];
 386
 387                 $fields['parent-item-author'] = ['url' => 'parent-author-link', 'name' => 'parent-author-name'];
 388
 389                 $fields['event'] = ['created' => 'event-created', 'edited' => 'event-edited',
 390                         'start' => 'event-start','finish' => 'event-finish',
 391                         'summary' => 'event-summary','desc' => 'event-desc',
 392                         'location' => 'event-location', 'type' => 'event-type',
 393                         'nofinish' => 'event-nofinish','adjust' => 'event-adjust',
 394                         'ignore' => 'event-ignore', 'id' => 'event-id'];
 395
 396                 $fields['sign'] = ['signed_text', 'signature', 'signer'];
 397
 398                 return $fields;
 399         }
 400
 401         /**
 402          * @brief Returns SQL condition for the "select" functions
 403          *
 404          * @param boolean $thread_mode Called for the items (false) or for the threads (true)
 405          *
 406          * @return string SQL condition
 407          */
 408         private static function condition($thread_mode)
 409         {
 410                 if ($thread_mode) {
 411                         $master_table = "`thread`";
 412                 } else {
 413                         $master_table = "`item`";
 414                 }
 415                 return "$master_table.`visible` AND NOT $master_table.`deleted` AND NOT $master_table.`moderated` AND (`user-item`.`hidden` IS NULL OR NOT `user-item`.`hidden`) ";
 416         }
 417
 418         /**
 419          * @brief Returns all needed "JOIN" commands for the "select" functions
 420          *
 421          * @param integer $uid User ID
 422          * @param string $sql_commands The parts of the built SQL commands in the "select" functions
 423          * @param boolean $thread_mode Called for the items (false) or for the threads (true)
 424          *
 425          * @return string The SQL joins for the "select" functions
 426          */
 427         private static function constructJoins($uid, $sql_commands, $thread_mode)
 428         {
 429                 if ($thread_mode) {
 430                         $master_table = "`thread`";
 431                         $master_table_key = "`thread`.`iid`";
 432                         $joins = "STRAIGHT_JOIN `item` ON `item`.`id` = `thread`.`iid` ";
 433                 } else {
 434                         $master_table = "`item`";
 435                         $master_table_key = "`item`.`id`";
 436                         $joins = '';
 437                 }
 438
 439                 $joins .= sprintf("STRAIGHT_JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`
 440                         AND NOT `contact`.`blocked`
 441                         AND ((NOT `contact`.`readonly` AND NOT `contact`.`pending` AND (`contact`.`rel` IN (%s, %s)))
 442                         OR `contact`.`self` OR (`item`.`id` != `item`.`parent`) OR `contact`.`uid` = 0)
 443                         STRAIGHT_JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id` AND NOT `author`.`blocked`
 444                         STRAIGHT_JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id` AND NOT `owner`.`blocked`
 445                         LEFT JOIN `user-item` ON `user-item`.`iid` = $master_table_key AND `user-item`.`uid` = %d",
 446                         CONTACT_IS_SHARING, CONTACT_IS_FRIEND, intval($uid));
 447
 448                 if (strpos($sql_commands, "`group_member`.") !== false) {
 449                         $joins .= " STRAIGHT_JOIN `group_member` ON `group_member`.`contact-id` = $master_table.`contact-id`";
 450                 }
 451
 452                 if (strpos($sql_commands, "`user`.") !== false) {
 453                         $joins .= " STRAIGHT_JOIN `user` ON `user`.`uid` = $master_table.`uid`";
 454                 }
 455
 456                 if (strpos($sql_commands, "`event`.") !== false) {
 457                         $joins .= " LEFT JOIN `event` ON `event-id` = `event`.`id`";
 458                 }
 459
 460                 if (strpos($sql_commands, "`sign`.") !== false) {
 461                         $joins .= " LEFT JOIN `sign` ON `sign`.`iid` = `item`.`id`";
 462                 }
 463
 464                 if (strpos($sql_commands, "`item-content`.") !== false) {
 465                         $joins .= " LEFT JOIN `item-content` ON `item-content`.`uri` = `item`.`uri`";
 466                 }
 467
 468                 if ((strpos($sql_commands, "`parent-item`.") !== false) || (strpos($sql_commands, "`parent-author`.") !== false)) {
 469                         $joins .= " STRAIGHT_JOIN `item` AS `parent-item` ON `parent-item`.`id` = `item`.`parent`";
 470                 }
 471
 472                 if (strpos($sql_commands, "`parent-item-author`.") !== false) {
 473                         $joins .= " STRAIGHT_JOIN `contact` AS `parent-item-author` ON `parent-item-author`.`id` = `parent-item`.`author-id`";
 474                 }
 475
 476                 return $joins;
 477         }
 478
 479         /**
 480          * @brief Add the field list for the "select" functions
 481          *
 482          * @param array $fields The field definition array
 483          * @param array $selected The array with the selected fields from the "select" functions
 484          *
 485          * @return string The field list
 486          */
 487         private static function constructSelectFields($fields, $selected)
 488         {
 489                 $selection = [];
 490                 foreach ($fields as $table => $table_fields) {
 491                         foreach ($table_fields as $field => $select) {
 492                                 if (empty($selected) || in_array($select, $selected)) {
 493                                         if (in_array($select, self::CONTENT_FIELDLIST)) {
 494                                                 $selection[] = "`item-content`.`".$select."` AS `item-content-" . $select . "`";
 495                                         }
 496                                         if (is_int($field)) {
 497                                                 $selection[] = "`" . $table . "`.`" . $select . "`";
 498                                         } else {
 499                                                 $selection[] = "`" . $table . "`.`" . $field . "` AS `" . $select . "`";
 500                                         }
 501                                 }
 502                         }
 503                 }
 504                 return implode(", ", $selection);
 505         }
 506
 507         /**
 508          * @brief add table definition to fields in an SQL query
 509          *
 510          * @param string $query SQL query
 511          * @param array $fields The field definition array
 512          *
 513          * @return string the changed SQL query
 514          */
 515         private static function addTablesToFields($query, $fields)
 516         {
 517                 foreach ($fields as $table => $table_fields) {
 518                         foreach ($table_fields as $alias => $field) {
 519                                 if (is_int($alias)) {
 520                                         $replace_field = $field;
 521                                 } else {
 522                                         $replace_field = $alias;
 523                                 }
 524
 525                                 $search = "/([^\.])`" . $field . "`/i";
 526                                 $replace = "$1`" . $table . "`.`" . $replace_field . "`";
 527                                 $query = preg_replace($search, $replace, $query);
 528                         }
 529                 }
 530                 return $query;
 531         }
 532
 533         /**
 534          * @brief Update existing item entries
 535          *
 536          * @param array $fields The fields that are to be changed
 537          * @param array $condition The condition for finding the item entries
 538          *
 539          * In the future we may have to change permissions as well.
 540          * Then we had to add the user id as third parameter.
 541          *
 542          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 543          *
 544          * @return integer|boolean number of affected rows - or "false" if there was an error
 545          */
 546         public static function update(array $fields, array $condition)
 547         {
 548                 if (empty($condition) || empty($fields)) {
 549                         return false;
 550                 }
 551
 552                 // To ensure the data integrity we do it in an transaction
 553                 dba::transaction();
 554
 555                 // We cannot simply expand the condition to check for origin entries
 556                 // The condition needn't to be a simple array but could be a complex condition.
 557                 // And we have to execute this query before the update to ensure to fetch the same data.
 558                 $items = dba::select('item', ['id', 'origin', 'uri'], $condition);
 559
 560                 $success = dba::update('item', $fields, $condition);
 561
 562                 if (!$success) {
 563                         dba::close($items);
 564                         dba::rollback();
 565                         return false;
 566                 }
 567
 568                 $rows = dba::affected_rows();
 569
 570                 while ($item = dba::fetch($items)) {
 571                         self::updateContent($fields, ['uri' => $item['uri']]);
 572                         Term::insertFromTagFieldByItemId($item['id']);
 573                         Term::insertFromFileFieldByItemId($item['id']);
 574                         self::updateThread($item['id']);
 575
 576                         // We only need to notfiy others when it is an original entry from us.
 577                         // Only call the notifier when the item has some content relevant change.
 578                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 579                                 Worker::add(PRIORITY_HIGH, "Notifier", 'edit_post', $item['id']);
 580                         }
 581                 }
 582
 583                 dba::close($items);
 584                 dba::commit();
 585                 return $rows;
 586         }
 587
 588         /**
 589          * @brief Delete an item and notify others about it - if it was ours
 590          *
 591          * @param array $condition The condition for finding the item entries
 592          * @param integer $priority Priority for the notification
 593          */
 594         public static function delete($condition, $priority = PRIORITY_HIGH)
 595         {
 596                 $items = dba::select('item', ['id'], $condition);
 597                 while ($item = dba::fetch($items)) {
 598                         self::deleteById($item['id'], $priority);
 599                 }
 600                 dba::close($items);
 601         }
 602
 603         /**
 604          * @brief Delete an item for an user and notify others about it - if it was ours
 605          *
 606          * @param array $condition The condition for finding the item entries
 607          * @param integer $uid User who wants to delete this item
 608          */
 609         public static function deleteForUser($condition, $uid)
 610         {
 611                 if ($uid == 0) {
 612                         return;
 613                 }
 614
 615                 $items = dba::select('item', ['id', 'uid'], $condition);
 616                 while ($item = dba::fetch($items)) {
 617                         // "Deleting" global items just means hiding them
 618                         if ($item['uid'] == 0) {
 619                                 dba::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
 620                         } elseif ($item['uid'] == $uid) {
 621                                 self::deleteById($item['id'], PRIORITY_HIGH);
 622                         } else {
 623                                 logger('Wrong ownership. Not deleting item ' . $item['id']);
 624                         }
 625                 }
 626                 dba::close($items);
 627         }
 628
 629         /**
 630          * @brief Delete an item and notify others about it - if it was ours
 631          *
 632          * @param integer $item_id Item ID that should be delete
 633          * @param integer $priority Priority for the notification
 634          *
 635          * @return boolean success
 636          */
 637         private static function deleteById($item_id, $priority = PRIORITY_HIGH)
 638         {
 639                 // locate item to be deleted
 640                 $fields = ['id', 'uri', 'uid', 'parent', 'parent-uri', 'origin',
 641                         'deleted', 'file', 'resource-id', 'event-id', 'attach',
 642                         'verb', 'object-type', 'object', 'target', 'contact-id'];
 643                 $item = dba::selectFirst('item', $fields, ['id' => $item_id]);
 644                 if (!DBM::is_result($item)) {
 645                         logger('Item with ID ' . $item_id . " hasn't been found.", LOGGER_DEBUG);
 646                         return false;
 647                 }
 648
 649                 if ($item['deleted']) {
 650                         logger('Item with ID ' . $item_id . ' has already been deleted.', LOGGER_DEBUG);
 651                         return false;
 652                 }
 653
 654                 $parent = dba::selectFirst('item', ['origin'], ['id' => $item['parent']]);
 655                 if (!DBM::is_result($parent)) {
 656                         $parent = ['origin' => false];
 657                 }
 658
 659                 // clean up categories and tags so they don't end up as orphans
 660
 661                 $matches = false;
 662                 $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
 663                 if ($cnt) {
 664                         foreach ($matches as $mtch) {
 665                                 file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],true);
 666                         }
 667                 }
 668
 669                 $matches = false;
 670
 671                 $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
 672                 if ($cnt) {
 673                         foreach ($matches as $mtch) {
 674                                 file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],false);
 675                         }
 676                 }
 677
 678                 /*
 679                  * If item is a link to a photo resource, nuke all the associated photos
 680                  * (visitors will not have photo resources)
 681                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 682                  * generate a resource-id and therefore aren't intimately linked to the item.
 683                  */
 684                 if (strlen($item['resource-id'])) {
 685                         dba::delete('photo', ['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 686                 }
 687
 688                 // If item is a link to an event, delete the event.
 689                 if (intval($item['event-id'])) {
 690                         Event::delete($item['event-id']);
 691                 }
 692
 693                 // If item has attachments, drop them
 694                 foreach (explode(", ", $item['attach']) as $attach) {
 695                         preg_match("|attach/(\d+)|", $attach, $matches);
 696                         dba::delete('attach', ['id' => $matches[1], 'uid' => $item['uid']]);
 697                 }
 698
 699                 // Delete tags that had been attached to other items
 700                 self::deleteTagsFromItem($item);
 701
 702                 // Set the item to "deleted"
 703                 dba::update('item', ['deleted' => true, 'title' => '', 'body' => '',
 704                                         'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()],
 705                                 ['id' => $item['id']]);
 706
 707                 Term::insertFromTagFieldByItemId($item['id']);
 708                 Term::insertFromFileFieldByItemId($item['id']);
 709                 self::deleteThread($item['id'], $item['parent-uri']);
 710
 711                 if (!dba::exists('item', ["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
 712                         self::delete(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
 713                 }
 714
 715                 // If it's the parent of a comment thread, kill all the kids
 716                 if ($item['id'] == $item['parent']) {
 717                         self::delete(['parent' => $item['parent'], 'deleted' => false], $priority);
 718                 }
 719
 720                 // Is it our comment and/or our thread?
 721                 if ($item['origin'] || $parent['origin']) {
 722
 723                         // When we delete the original post we will delete all existing copies on the server as well
 724                         self::delete(['uri' => $item['uri'], 'deleted' => false], $priority);
 725
 726                         // send the notification upstream/downstream
 727                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", "drop", intval($item['id']));
 728                 } elseif ($item['uid'] != 0) {
 729
 730                         // When we delete just our local user copy of an item, we have to set a marker to hide it
 731                         $global_item = dba::selectFirst('item', ['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
 732                         if (DBM::is_result($global_item)) {
 733                                 dba::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
 734                         }
 735                 }
 736
 737                 logger('Item with ID ' . $item_id . " has been deleted.", LOGGER_DEBUG);
 738
 739                 return true;
 740         }
 741
 742         private static function deleteTagsFromItem($item)
 743         {
 744                 if (($item["verb"] != ACTIVITY_TAG) || ($item["object-type"] != ACTIVITY_OBJ_TAGTERM)) {
 745                         return;
 746                 }
 747
 748                 $xo = XML::parseString($item["object"], false);
 749                 $xt = XML::parseString($item["target"], false);
 750
 751                 if ($xt->type != ACTIVITY_OBJ_NOTE) {
 752                         return;
 753                 }
 754
 755                 $i = dba::selectFirst('item', ['id', 'contact-id', 'tag'], ['uri' => $xt->id, 'uid' => $item['uid']]);
 756                 if (!DBM::is_result($i)) {
 757                         return;
 758                 }
 759
 760                 // For tags, the owner cannot remove the tag on the author's copy of the post.
 761                 $owner_remove = ($item["contact-id"] == $i["contact-id"]);
 762                 $author_copy = $item["origin"];
 763
 764                 if (($owner_remove && $author_copy) || !$owner_remove) {
 765                         return;
 766                 }
 767
 768                 $tags = explode(',', $i["tag"]);
 769                 $newtags = [];
 770                 if (count($tags)) {
 771                         foreach ($tags as $tag) {
 772                                 if (trim($tag) !== trim($xo->body)) {
 773                                        $newtags[] = trim($tag);
 774                                 }
 775                         }
 776                 }
 777                 self::update(['tag' => implode(',', $newtags)], ['id' => $i["id"]]);
 778         }
 779
 780         private static function guid($item, $notify)
 781         {
 782                 $guid = notags(trim($item['guid']));
 783
 784                 if (!empty($guid)) {
 785                         return $guid;
 786                 }
 787
 788                 if ($notify) {
 789                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 790                         // We add the hash of our own host because our host is the original creator of the post.
 791                         $prefix_host = get_app()->get_hostname();
 792                 } else {
 793                         $prefix_host = '';
 794
 795                         // We are only storing the post so we create a GUID from the original hostname.
 796                         if (!empty($item['author-link'])) {
 797                                 $parsed = parse_url($item['author-link']);
 798                                 if (!empty($parsed['host'])) {
 799                                         $prefix_host = $parsed['host'];
 800                                 }
 801                         }
 802
 803                         if (empty($prefix_host) && !empty($item['plink'])) {
 804                                 $parsed = parse_url($item['plink']);
 805                                 if (!empty($parsed['host'])) {
 806                                         $prefix_host = $parsed['host'];
 807                                 }
 808                         }
 809
 810                         if (empty($prefix_host) && !empty($item['uri'])) {
 811                                 $parsed = parse_url($item['uri']);
 812                                 if (!empty($parsed['host'])) {
 813                                         $prefix_host = $parsed['host'];
 814                                 }
 815                         }
 816
 817                         // Is it in the format data@host.tld? - Used for mail contacts
 818                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 819                                 $mailparts = explode('@', $item['author-link']);
 820                                 $prefix_host = array_pop($mailparts);
 821                         }
 822                 }
 823
 824                 if (!empty($item['plink'])) {
 825                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 826                 } elseif (!empty($item['uri'])) {
 827                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 828                 } else {
 829                         $guid = get_guid(32, hash('crc32', $prefix_host));
 830                 }
 831
 832                 return $guid;
 833         }
 834
 835         private static function contactId($item)
 836         {
 837                 $contact_id = (int)$item["contact-id"];
 838
 839                 if (!empty($contact_id)) {
 840                         return $contact_id;
 841                 }
 842                 logger('Missing contact-id. Called by: '.System::callstack(), LOGGER_DEBUG);
 843                 /*
 844                  * First we are looking for a suitable contact that matches with the author of the post
 845                  * This is done only for comments
 846                  */
 847                 if ($item['parent-uri'] != $item['uri']) {
 848                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 849                 }
 850
 851                 // If not present then maybe the owner was found
 852                 if ($contact_id == 0) {
 853                         $contact_id = Contact::getIdForURL($item['owner-link'], $item['uid']);
 854                 }
 855
 856                 // Still missing? Then use the "self" contact of the current user
 857                 if ($contact_id == 0) {
 858                         $self = dba::selectFirst('contact', ['id'], ['self' => true, 'uid' => $item['uid']]);
 859                         if (DBM::is_result($self)) {
 860                                 $contact_id = $self["id"];
 861                         }
 862                 }
 863                 logger("Contact-id was missing for post ".$item['guid']." from user id ".$item['uid']." - now set to ".$contact_id, LOGGER_DEBUG);
 864
 865                 return $contact_id;
 866         }
 867
 868         public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
 869         {
 870                 $a = get_app();
 871
 872                 // If it is a posting where users should get notifications, then define it as wall posting
 873                 if ($notify) {
 874                         $item['wall'] = 1;
 875                         $item['type'] = 'wall';
 876                         $item['origin'] = 1;
 877                         $item['network'] = NETWORK_DFRN;
 878                         $item['protocol'] = PROTOCOL_DFRN;
 879
 880                         if (is_int($notify)) {
 881                                 $priority = $notify;
 882                         } else {
 883                                 $priority = PRIORITY_HIGH;
 884                         }
 885                 } else {
 886                         $item['network'] = trim(defaults($item, 'network', NETWORK_PHANTOM));
 887                 }
 888
 889                 $item['guid'] = self::guid($item, $notify);
 890                 $item['uri'] = notags(trim(defaults($item, 'uri', self::newURI($item['uid'], $item['guid']))));
 891
 892                 // Store conversation data
 893                 $item = Conversation::insert($item);
 894
 895                 /*
 896                  * If a Diaspora signature structure was passed in, pull it out of the
 897                  * item array and set it aside for later storage.
 898                  */
 899
 900                 $dsprsig = null;
 901                 if (x($item, 'dsprsig')) {
 902                         $encoded_signature = $item['dsprsig'];
 903                         $dsprsig = json_decode(base64_decode($item['dsprsig']));
 904                         unset($item['dsprsig']);
 905                 }
 906
 907                 if (!empty($item['diaspora_signed_text'])) {
 908                         $diaspora_signed_text = $item['diaspora_signed_text'];
 909                         unset($item['diaspora_signed_text']);
 910                 } else {
 911                         $diaspora_signed_text = '';
 912                 }
 913
 914                 // Converting the plink
 915                 /// @TODO Check if this is really still needed
 916                 if ($item['network'] == NETWORK_OSTATUS) {
 917                         if (isset($item['plink'])) {
 918                                 $item['plink'] = OStatus::convertHref($item['plink']);
 919                         } elseif (isset($item['uri'])) {
 920                                 $item['plink'] = OStatus::convertHref($item['uri']);
 921                         }
 922                 }
 923
 924                 if (!empty($item['thr-parent'])) {
 925                         $item['parent-uri'] = $item['thr-parent'];
 926                 }
 927
 928                 if (x($item, 'gravity')) {
 929                         $item['gravity'] = intval($item['gravity']);
 930                 } elseif ($item['parent-uri'] === $item['uri']) {
 931                         $item['gravity'] = 0;
 932                 } elseif (activity_match($item['verb'],ACTIVITY_POST)) {
 933                         $item['gravity'] = 6;
 934                 } else {
 935                         $item['gravity'] = 6;   // extensible catchall
 936                 }
 937
 938                 $item['type'] = defaults($item, 'type', 'remote');
 939
 940                 $uid = intval($item['uid']);
 941
 942                 // check for create date and expire time
 943                 $expire_interval = Config::get('system', 'dbclean-expire-days', 0);
 944
 945                 $user = dba::selectFirst('user', ['expire'], ['uid' => $uid]);
 946                 if (DBM::is_result($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 947                         $expire_interval = $user['expire'];
 948                 }
 949
 950                 if (($expire_interval > 0) && !empty($item['created'])) {
 951                         $expire_date = time() - ($expire_interval * 86400);
 952                         $created_date = strtotime($item['created']);
 953                         if ($created_date < $expire_date) {
 954                                 logger('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), LOGGER_DEBUG);
 955                                 return 0;
 956                         }
 957                 }
 958
 959                 /*
 960                  * Do we already have this item?
 961                  * We have to check several networks since Friendica posts could be repeated
 962                  * via OStatus (maybe Diasporsa as well)
 963                  */
 964                 if (in_array($item['network'], [NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS, ""])) {
 965                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?)",
 966                                 trim($item['uri']), $item['uid'],
 967                                 NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS];
 968                         $existing = dba::selectFirst('item', ['id', 'network'], $condition);
 969                         if (DBM::is_result($existing)) {
 970                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 971                                 if ($uid != 0) {
 972                                         logger("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
 973                                 }
 974
 975                                 return $existing["id"];
 976                         }
 977                 }
 978
 979                 self::addLanguageInPostopts($item);
 980
 981                 $item['wall']          = intval(defaults($item, 'wall', 0));
 982                 $item['extid']         = trim(defaults($item, 'extid', ''));
 983                 $item['author-name']   = trim(defaults($item, 'author-name', ''));
 984                 $item['author-link']   = trim(defaults($item, 'author-link', ''));
 985                 $item['author-avatar'] = trim(defaults($item, 'author-avatar', ''));
 986                 $item['owner-name']    = trim(defaults($item, 'owner-name', ''));
 987                 $item['owner-link']    = trim(defaults($item, 'owner-link', ''));
 988                 $item['owner-avatar']  = trim(defaults($item, 'owner-avatar', ''));
 989                 $item['received']      = ((x($item, 'received') !== false) ? DateTimeFormat::utc($item['received']) : DateTimeFormat::utcNow());
 990                 $item['created']       = ((x($item, 'created') !== false) ? DateTimeFormat::utc($item['created']) : $item['received']);
 991                 $item['edited']        = ((x($item, 'edited') !== false) ? DateTimeFormat::utc($item['edited']) : $item['created']);
 992                 $item['changed']       = ((x($item, 'changed') !== false) ? DateTimeFormat::utc($item['changed']) : $item['created']);
 993                 $item['commented']     = ((x($item, 'commented') !== false) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 994                 $item['title']         = trim(defaults($item, 'title', ''));
 995                 $item['location']      = trim(defaults($item, 'location', ''));
 996                 $item['coord']         = trim(defaults($item, 'coord', ''));
 997                 $item['visible']       = ((x($item, 'visible') !== false) ? intval($item['visible'])         : 1);
 998                 $item['deleted']       = 0;
 999                 $item['parent-uri']    = trim(defaults($item, 'parent-uri', $item['uri']));
1000                 $item['verb']          = trim(defaults($item, 'verb', ''));
1001                 $item['object-type']   = trim(defaults($item, 'object-type', ''));
1002                 $item['object']        = trim(defaults($item, 'object', ''));
1003                 $item['target-type']   = trim(defaults($item, 'target-type', ''));
1004                 $item['target']        = trim(defaults($item, 'target', ''));
1005                 $item['plink']         = trim(defaults($item, 'plink', ''));
1006                 $item['allow_cid']     = trim(defaults($item, 'allow_cid', ''));
1007                 $item['allow_gid']     = trim(defaults($item, 'allow_gid', ''));
1008                 $item['deny_cid']      = trim(defaults($item, 'deny_cid', ''));
1009                 $item['deny_gid']      = trim(defaults($item, 'deny_gid', ''));
1010                 $item['private']       = intval(defaults($item, 'private', 0));
1011                 $item['bookmark']      = intval(defaults($item, 'bookmark', 0));
1012                 $item['body']          = trim(defaults($item, 'body', ''));
1013                 $item['tag']           = trim(defaults($item, 'tag', ''));
1014                 $item['attach']        = trim(defaults($item, 'attach', ''));
1015                 $item['app']           = trim(defaults($item, 'app', ''));
1016                 $item['origin']        = intval(defaults($item, 'origin', 0));
1017                 $item['postopts']      = trim(defaults($item, 'postopts', ''));
1018                 $item['resource-id']   = trim(defaults($item, 'resource-id', ''));
1019                 $item['event-id']      = intval(defaults($item, 'event-id', 0));
1020                 $item['inform']        = trim(defaults($item, 'inform', ''));
1021                 $item['file']          = trim(defaults($item, 'file', ''));
1022
1023                 // When there is no content then we don't post it
1024                 if ($item['body'].$item['title'] == '') {
1025                         return 0;
1026                 }
1027
1028                 // Items cannot be stored before they happen ...
1029                 if ($item['created'] > DateTimeFormat::utcNow()) {
1030                         $item['created'] = DateTimeFormat::utcNow();
1031                 }
1032
1033                 // We haven't invented time travel by now.
1034                 if ($item['edited'] > DateTimeFormat::utcNow()) {
1035                         $item['edited'] = DateTimeFormat::utcNow();
1036                 }
1037
1038                 if (($item['author-link'] == "") && ($item['owner-link'] == "")) {
1039                         logger("Both author-link and owner-link are empty. Called by: " . System::callstack(), LOGGER_DEBUG);
1040                 }
1041
1042                 $item['plink'] = defaults($item, 'plink', System::baseUrl() . '/display/' . urlencode($item['guid']));
1043
1044                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
1045                 $item["contact-id"] = self::contactId($item);
1046
1047                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
1048                         'photo' => $item['author-avatar'], 'network' => $item['network']];
1049
1050                 $item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
1051
1052                 if (Contact::isBlocked($item["author-id"])) {
1053                         logger('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
1054                         return 0;
1055                 }
1056
1057                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
1058                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
1059
1060                 $item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
1061
1062                 if (Contact::isBlocked($item["owner-id"])) {
1063                         logger('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
1064                         return 0;
1065                 }
1066
1067                 //unset($item['author-link']);
1068                 unset($item['author-name']);
1069                 unset($item['author-avatar']);
1070
1071                 //unset($item['owner-link']);
1072                 unset($item['owner-name']);
1073                 unset($item['owner-avatar']);
1074
1075                 if ($item['network'] == NETWORK_PHANTOM) {
1076                         logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
1077
1078                         $contact = Contact::getDetailsByURL($item['author-link'], $item['uid']);
1079                         if (!empty($contact['network'])) {
1080                                 $item['network'] = $contact["network"];
1081                         } else {
1082                                 $item['network'] = NETWORK_DFRN;
1083                         }
1084                         logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
1085                 }
1086
1087                 // Checking if there is already an item with the same guid
1088                 logger('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], LOGGER_DEBUG);
1089                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
1090                 if (dba::exists('item', $condition)) {
1091                         logger('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], LOGGER_DEBUG);
1092                         return 0;
1093                 }
1094
1095                 // Check for hashtags in the body and repair or add hashtag links
1096                 self::setHashtags($item);
1097
1098                 $item['thr-parent'] = $item['parent-uri'];
1099
1100                 $notify_type = '';
1101                 $allow_cid = '';
1102                 $allow_gid = '';
1103                 $deny_cid  = '';
1104                 $deny_gid  = '';
1105
1106                 if ($item['parent-uri'] === $item['uri']) {
1107                         $parent_id = 0;
1108                         $parent_deleted = 0;
1109                         $allow_cid = $item['allow_cid'];
1110                         $allow_gid = $item['allow_gid'];
1111                         $deny_cid  = $item['deny_cid'];
1112                         $deny_gid  = $item['deny_gid'];
1113                         $notify_type = 'wall-new';
1114                 } else {
1115                         // find the parent and snarf the item id and ACLs
1116                         // and anything else we need to inherit
1117
1118                         $fields = ['uri', 'parent-uri', 'id', 'deleted',
1119                                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
1120                                 'wall', 'private', 'forum_mode', 'origin'];
1121                         $condition = ['uri' => $item['parent-uri'], 'uid' => $item['uid']];
1122                         $params = ['order' => ['id' => false]];
1123                         $parent = dba::selectFirst('item', $fields, $condition, $params);
1124
1125                         if (DBM::is_result($parent)) {
1126                                 // is the new message multi-level threaded?
1127                                 // even though we don't support it now, preserve the info
1128                                 // and re-attach to the conversation parent.
1129
1130                                 if ($parent['uri'] != $parent['parent-uri']) {
1131                                         $item['parent-uri'] = $parent['parent-uri'];
1132
1133                                         $condition = ['uri' => $item['parent-uri'],
1134                                                 'parent-uri' => $item['parent-uri'],
1135                                                 'uid' => $item['uid']];
1136                                         $params = ['order' => ['id' => false]];
1137                                         $toplevel_parent = dba::selectFirst('item', $fields, $condition, $params);
1138
1139                                         if (DBM::is_result($toplevel_parent)) {
1140                                                 $parent = $toplevel_parent;
1141                                         }
1142                                 }
1143
1144                                 $parent_id      = $parent['id'];
1145                                 $parent_deleted = $parent['deleted'];
1146                                 $allow_cid      = $parent['allow_cid'];
1147                                 $allow_gid      = $parent['allow_gid'];
1148                                 $deny_cid       = $parent['deny_cid'];
1149                                 $deny_gid       = $parent['deny_gid'];
1150                                 $item['wall']    = $parent['wall'];
1151                                 $notify_type    = 'comment-new';
1152
1153                                 /*
1154                                  * If the parent is private, force privacy for the entire conversation
1155                                  * This differs from the above settings as it subtly allows comments from
1156                                  * email correspondents to be private even if the overall thread is not.
1157                                  */
1158                                 if ($parent['private']) {
1159                                         $item['private'] = $parent['private'];
1160                                 }
1161
1162                                 /*
1163                                  * Edge case. We host a public forum that was originally posted to privately.
1164                                  * The original author commented, but as this is a comment, the permissions
1165                                  * weren't fixed up so it will still show the comment as private unless we fix it here.
1166                                  */
1167                                 if ((intval($parent['forum_mode']) == 1) && $parent['private']) {
1168                                         $item['private'] = 0;
1169                                 }
1170
1171                                 // If its a post from myself then tag the thread as "mention"
1172                                 logger("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], LOGGER_DEBUG);
1173                                 $user = dba::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
1174                                 if (DBM::is_result($user)) {
1175                                         $self = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
1176                                         $self_id = Contact::getIdForURL($self, 0, true);
1177                                         logger("'myself' is ".$self_id." for parent ".$parent_id." checking against ".$item['author-id']." and ".$item['owner-id'], LOGGER_DEBUG);
1178                                         if (($item['author-id'] == $self_id) || ($item['owner-id'] == $self_id)) {
1179                                                 dba::update('thread', ['mention' => true], ['iid' => $parent_id]);
1180                                                 logger("tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
1181                                         }
1182                                 }
1183                         } else {
1184                                 /*
1185                                  * Allow one to see reply tweets from status.net even when
1186                                  * we don't have or can't see the original post.
1187                                  */
1188                                 if ($force_parent) {
1189                                         logger('$force_parent=true, reply converted to top-level post.');
1190                                         $parent_id = 0;
1191                                         $item['parent-uri'] = $item['uri'];
1192                                         $item['gravity'] = 0;
1193                                 } else {
1194                                         logger('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
1195                                         return 0;
1196                                 }
1197
1198                                 $parent_deleted = 0;
1199                         }
1200                 }
1201
1202                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
1203                         $item['uri'], $item['network'], NETWORK_DFRN, $item['uid']];
1204                 if (dba::exists('item', $condition)) {
1205                         logger('duplicated item with the same uri found. '.print_r($item,true));
1206                         return 0;
1207                 }
1208
1209                 // On Friendica and Diaspora the GUID is unique
1210                 if (in_array($item['network'], [NETWORK_DFRN, NETWORK_DIASPORA])) {
1211                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
1212                         if (dba::exists('item', $condition)) {
1213                                 logger('duplicated item with the same guid found. '.print_r($item,true));
1214                                 return 0;
1215                         }
1216                 } else {
1217                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
1218                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
1219                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
1220                         if (dba::exists('item', $condition)) {
1221                                 logger('duplicated item with the same body found. '.print_r($item,true));
1222                                 return 0;
1223                         }
1224                 }
1225
1226                 // Is this item available in the global items (with uid=0)?
1227                 if ($item["uid"] == 0) {
1228                         $item["global"] = true;
1229
1230                         // Set the global flag on all items if this was a global item entry
1231                         dba::update('item', ['global' => true], ['uri' => $item["uri"]]);
1232                 } else {
1233                         $item["global"] = dba::exists('item', ['uid' => 0, 'uri' => $item["uri"]]);
1234                 }
1235
1236                 // ACL settings
1237                 if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
1238                         $private = 1;
1239                 } else {
1240                         $private = $item['private'];
1241                 }
1242
1243                 $item["allow_cid"] = $allow_cid;
1244                 $item["allow_gid"] = $allow_gid;
1245                 $item["deny_cid"] = $deny_cid;
1246                 $item["deny_gid"] = $deny_gid;
1247                 $item["private"] = $private;
1248                 $item["deleted"] = $parent_deleted;
1249
1250                 // Fill the cache field
1251                 put_item_in_cache($item);
1252
1253                 if ($notify) {
1254                         Addon::callHooks('post_local', $item);
1255                 } else {
1256                         Addon::callHooks('post_remote', $item);
1257                 }
1258
1259                 // This array field is used to trigger some automatic reactions
1260                 // It is mainly used in the "post_local" hook.
1261                 unset($item['api_source']);
1262
1263                 if (x($item, 'cancel')) {
1264                         logger('post cancelled by addon.');
1265                         return 0;
1266                 }
1267
1268                 /*
1269                  * Check for already added items.
1270                  * There is a timing issue here that sometimes creates double postings.
1271                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
1272                  */
1273                 if ($item["uid"] == 0) {
1274                         if (dba::exists('item', ['uri' => trim($item['uri']), 'uid' => 0])) {
1275                                 logger('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], LOGGER_DEBUG);
1276                                 return 0;
1277                         }
1278                 }
1279
1280                 logger('' . print_r($item,true), LOGGER_DATA);
1281
1282                 dba::transaction();
1283                 self::insertContent($item);
1284                 $ret = dba::insert('item', $item);
1285
1286                 // When the item was successfully stored we fetch the ID of the item.
1287                 if (DBM::is_result($ret)) {
1288                         $current_post = dba::lastInsertId();
1289                 } else {
1290                         // This can happen - for example - if there are locking timeouts.
1291                         dba::rollback();
1292
1293                         // Store the data into a spool file so that we can try again later.
1294
1295                         // At first we restore the Diaspora signature that we removed above.
1296                         if (isset($encoded_signature)) {
1297                                 $item['dsprsig'] = $encoded_signature;
1298                         }
1299
1300                         // Now we store the data in the spool directory
1301                         // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
1302                         $file = 'item-'.round(microtime(true) * 10000).'-'.mt_rand().'.msg';
1303
1304                         $spoolpath = get_spoolpath();
1305                         if ($spoolpath != "") {
1306                                 $spool = $spoolpath.'/'.$file;
1307                                 file_put_contents($spool, json_encode($item));
1308                                 logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
1309                         }
1310                         return 0;
1311                 }
1312
1313                 if ($current_post == 0) {
1314                         // This is one of these error messages that never should occur.
1315                         logger("couldn't find created item - we better quit now.");
1316                         dba::rollback();
1317                         return 0;
1318                 }
1319
1320                 // How much entries have we created?
1321                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
1322                 $entries = dba::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
1323
1324                 if ($entries > 1) {
1325                         // There are duplicates. We delete our just created entry.
1326                         logger('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
1327
1328                         // Yes, we could do a rollback here - but we are having many users with MyISAM.
1329                         dba::delete('item', ['id' => $current_post]);
1330                         dba::commit();
1331                         return 0;
1332                 } elseif ($entries == 0) {
1333                         // This really should never happen since we quit earlier if there were problems.
1334                         logger("Something is terribly wrong. We haven't found our created entry.");
1335                         dba::rollback();
1336                         return 0;
1337                 }
1338
1339                 logger('created item '.$current_post);
1340                 self::updateContact($item);
1341
1342                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
1343                         $parent_id = $current_post;
1344                 }
1345
1346                 // Set parent id
1347                 dba::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1348
1349                 $item['id'] = $current_post;
1350                 $item['parent'] = $parent_id;
1351
1352                 // update the commented timestamp on the parent
1353                 // Only update "commented" if it is really a comment
1354                 if (($item['verb'] == ACTIVITY_POST) || !Config::get("system", "like_no_comment")) {
1355                         dba::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1356                 } else {
1357                         dba::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1358                 }
1359
1360                 if ($dsprsig) {
1361                         /*
1362                          * Friendica servers lower than 3.4.3-2 had double encoded the signature ...
1363                          * We can check for this condition when we decode and encode the stuff again.
1364                          */
1365                         if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
1366                                 $dsprsig->signature = base64_decode($dsprsig->signature);
1367                                 logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
1368                         }
1369
1370                         dba::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
1371                                                 'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
1372                 }
1373
1374                 if (!empty($diaspora_signed_text)) {
1375                         // Formerly we stored the signed text, the signature and the author in different fields.
1376                         // We now store the raw data so that we are more flexible.
1377                         dba::insert('sign', ['iid' => $current_post, 'signed_text' => $diaspora_signed_text]);
1378                 }
1379
1380                 $deleted = self::tagDeliver($item['uid'], $current_post);
1381
1382                 /*
1383                  * current post can be deleted if is for a community page and no mention are
1384                  * in it.
1385                  */
1386                 if (!$deleted && !$dontcache) {
1387                         $posted_item = dba::selectFirst('item', [], ['id' => $current_post]);
1388                         if (DBM::is_result($posted_item)) {
1389                                 if ($notify) {
1390                                         Addon::callHooks('post_local_end', $posted_item);
1391                                 } else {
1392                                         Addon::callHooks('post_remote_end', $posted_item);
1393                                 }
1394                         } else {
1395                                 logger('new item not found in DB, id ' . $current_post);
1396                         }
1397                 }
1398
1399                 if ($item['parent-uri'] === $item['uri']) {
1400                         self::addThread($current_post);
1401                 } else {
1402                         self::updateThread($parent_id);
1403                 }
1404
1405                 dba::commit();
1406
1407                 /*
1408                  * Due to deadlock issues with the "term" table we are doing these steps after the commit.
1409                  * This is not perfect - but a workable solution until we found the reason for the problem.
1410                  */
1411                 Term::insertFromTagFieldByItemId($current_post);
1412                 Term::insertFromFileFieldByItemId($current_post);
1413
1414                 if ($item['parent-uri'] === $item['uri']) {
1415                         self::addShadow($current_post);
1416                 } else {
1417                         self::addShadowPost($current_post);
1418                 }
1419
1420                 check_user_notification($current_post);
1421
1422                 if ($notify) {
1423                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", $notify_type, $current_post);
1424                 } elseif (!empty($parent) && $parent['origin']) {
1425                         Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "Notifier", "comment-import", $current_post);
1426                 }
1427
1428                 return $current_post;
1429         }
1430
1431         /**
1432          * @brief Insert a new item content entry
1433          *
1434          * @param array $item The item fields that are to be inserted
1435          */
1436         private static function insertContent(&$item)
1437         {
1438                 logger('Insert content for URI '.$item['uri']);
1439
1440                 $fields = ['uri' => $item['uri'], 'title' => $item['title'],
1441                         'content-warning' => $item['content-warning'],
1442                         'body' => $item['body'], 'location' => $item['location'],
1443                         'coord' => $item['coord'], 'app' => $item['app'],
1444                         'rendered-hash' => $item['rendered-hash'],
1445                         'rendered-html' => $item['rendered-html'],
1446                         'object-type' => $item['object-type'],
1447                         'object' => $item['object'], 'target-type' => $item['target-type'],
1448                         'target' => $item['target'], 'plink' => $item['plink'],
1449                         'uri-plink-hash' => hash('sha1', $item['plink']).hash('sha1', $item['uri'])];
1450
1451                 dba::insert('item-content', $fields, true);
1452         }
1453
1454         /**
1455          * @brief Update existing item content entries
1456          *
1457          * @param array $item The item fields that are to be changed
1458          * @param array $condition The condition for finding the item content entries
1459          */
1460         private static function updateContent($item, $condition)
1461         {
1462                 // We have to select only the fields from the "item-content" table
1463                 $fields = [];
1464                 foreach (self::CONTENT_FIELDLIST as $field) {
1465                         if (isset($item[$field])) {
1466                                 $fields[$field] = $item[$field];
1467                         }
1468                 }
1469
1470                 if (empty($fields)) {
1471                         return;
1472                 }
1473
1474                 logger('Update content for URI '.$condition['uri']);
1475
1476                 dba::update('item-content', $fields, $condition, true);
1477         }
1478
1479         /**
1480          * @brief Distributes public items to the receivers
1481          *
1482          * @param integer $itemid      Item ID that should be added
1483          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1484          */
1485         public static function distribute($itemid, $signed_text = '')
1486         {
1487                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
1488                 $parent = dba::selectFirst('item', ['owner-id'], $condition);
1489                 if (!DBM::is_result($parent)) {
1490                         return;
1491                 }
1492
1493                 // Only distribute public items from native networks
1494                 $condition = ['id' => $itemid, 'uid' => 0,
1495                         'network' => [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""],
1496                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
1497                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1498                 if (!DBM::is_result($item)) {
1499                         return;
1500                 }
1501
1502                 unset($item['id']);
1503                 unset($item['parent']);
1504                 unset($item['mention']);
1505                 unset($item['wall']);
1506                 unset($item['origin']);
1507                 unset($item['starred']);
1508                 unset($item['rendered-hash']);
1509                 unset($item['rendered-html']);
1510
1511                 $users = [];
1512
1513                 $condition = ["`nurl` IN (SELECT `nurl` FROM `contact` WHERE `id` = ?) AND `uid` != 0 AND NOT `blocked` AND `rel` IN (?, ?)",
1514                         $parent['owner-id'], CONTACT_IS_SHARING,  CONTACT_IS_FRIEND];
1515                 $contacts = dba::select('contact', ['uid'], $condition);
1516                 while ($contact = dba::fetch($contacts)) {
1517                         $users[$contact['uid']] = $contact['uid'];
1518                 }
1519
1520                 $origin_uid = 0;
1521
1522                 if ($item['uri'] != $item['parent-uri']) {
1523                         $parents = dba::select('item', ['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
1524                         while ($parent = dba::fetch($parents)) {
1525                                 $users[$parent['uid']] = $parent['uid'];
1526                                 if ($parent['origin'] && !$item['origin']) {
1527                                         $origin_uid = $parent['uid'];
1528                                 }
1529                         }
1530                 }
1531
1532                 foreach ($users as $uid) {
1533                         if ($origin_uid == $uid) {
1534                                 $item['diaspora_signed_text'] = $signed_text;
1535                         }
1536                         self::storeForUser($itemid, $item, $uid);
1537                 }
1538         }
1539
1540         /**
1541          * @brief Store public items for the receivers
1542          *
1543          * @param integer $itemid Item ID that should be added
1544          * @param array   $item   The item entry that will be stored
1545          * @param integer $uid    The user that will receive the item entry
1546          */
1547         private static function storeForUser($itemid, $item, $uid)
1548         {
1549                 $item['uid'] = $uid;
1550                 $item['origin'] = 0;
1551                 $item['wall'] = 0;
1552                 if ($item['uri'] == $item['parent-uri']) {
1553                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
1554                 } else {
1555                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
1556                 }
1557
1558                 if (empty($item['contact-id'])) {
1559                         $self = dba::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1560                         if (!DBM::is_result($self)) {
1561                                 return;
1562                         }
1563                         $item['contact-id'] = $self['id'];
1564                 }
1565
1566                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1567                         $item['type'] = 'remote-comment';
1568                 } elseif ($item['type'] == 'wall') {
1569                         $item['type'] = 'remote';
1570                 }
1571
1572                 /// @todo Handling of "event-id"
1573
1574                 $notify = false;
1575                 if ($item['uri'] == $item['parent-uri']) {
1576                         $contact = dba::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1577                         if (DBM::is_result($contact)) {
1578                                 $notify = self::isRemoteSelf($contact, $item);
1579                         }
1580                 }
1581
1582                 $distributed = self::insert($item, false, $notify, true);
1583
1584                 if (!$distributed) {
1585                         logger("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", LOGGER_DEBUG);
1586                 } else {
1587                         logger("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, LOGGER_DEBUG);
1588                 }
1589         }
1590
1591         /**
1592          * @brief Add a shadow entry for a given item id that is a thread starter
1593          *
1594          * We store every public item entry additionally with the user id "0".
1595          * This is used for the community page and for the search.
1596          * It is planned that in the future we will store public item entries only once.
1597          *
1598          * @param integer $itemid Item ID that should be added
1599          */
1600         public static function addShadow($itemid)
1601         {
1602                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network'];
1603                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1604                 $item = dba::selectFirst('item', $fields, $condition);
1605
1606                 if (!DBM::is_result($item)) {
1607                         return;
1608                 }
1609
1610                 // is it already a copy?
1611                 if (($itemid == 0) || ($item['uid'] == 0)) {
1612                         return;
1613                 }
1614
1615                 // Is it a visible public post?
1616                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || $item["private"]) {
1617                         return;
1618                 }
1619
1620                 // is it an entry from a connector? Only add an entry for natively connected networks
1621                 if (!in_array($item["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""])) {
1622                         return;
1623                 }
1624
1625                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1626
1627                 if (DBM::is_result($item) && ($item["allow_cid"] == '') && ($item["allow_gid"] == '') &&
1628                         ($item["deny_cid"] == '') && ($item["deny_gid"] == '')) {
1629
1630                         if (!dba::exists('item', ['uri' => $item['uri'], 'uid' => 0])) {
1631                                 // Preparing public shadow (removing user specific data)
1632                                 $item['uid'] = 0;
1633                                 unset($item['id']);
1634                                 unset($item['parent']);
1635                                 unset($item['wall']);
1636                                 unset($item['mention']);
1637                                 unset($item['origin']);
1638                                 unset($item['starred']);
1639                                 unset($item['rendered-hash']);
1640                                 unset($item['rendered-html']);
1641                                 if ($item['uri'] == $item['parent-uri']) {
1642                                         $item['contact-id'] = Contact::getIdForURL($item['owner-link']);
1643                                 } else {
1644                                         $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1645                                 }
1646
1647                                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1648                                         $item['type'] = 'remote-comment';
1649                                 } elseif ($item['type'] == 'wall') {
1650                                         $item['type'] = 'remote';
1651                                 }
1652
1653                                 $public_shadow = self::insert($item, false, false, true);
1654
1655                                 logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
1656                         }
1657                 }
1658         }
1659
1660         /**
1661          * @brief Add a shadow entry for a given item id that is a comment
1662          *
1663          * This function does the same like the function above - but for comments
1664          *
1665          * @param integer $itemid Item ID that should be added
1666          */
1667         public static function addShadowPost($itemid)
1668         {
1669                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1670                 if (!DBM::is_result($item)) {
1671                         return;
1672                 }
1673
1674                 // Is it a toplevel post?
1675                 if ($item['id'] == $item['parent']) {
1676                         self::addShadow($itemid);
1677                         return;
1678                 }
1679
1680                 // Is this a shadow entry?
1681                 if ($item['uid'] == 0) {
1682                         return;
1683                 }
1684
1685                 // Is there a shadow parent?
1686                 if (!dba::exists('item', ['uri' => $item['parent-uri'], 'uid' => 0])) {
1687                         return;
1688                 }
1689
1690                 // Is there already a shadow entry?
1691                 if (dba::exists('item', ['uri' => $item['uri'], 'uid' => 0])) {
1692                         return;
1693                 }
1694
1695                 // Save "origin" and "parent" state
1696                 $origin = $item['origin'];
1697                 $parent = $item['parent'];
1698
1699                 // Preparing public shadow (removing user specific data)
1700                 $item['uid'] = 0;
1701                 unset($item['id']);
1702                 unset($item['parent']);
1703                 unset($item['wall']);
1704                 unset($item['mention']);
1705                 unset($item['origin']);
1706                 unset($item['starred']);
1707                 unset($item['rendered-hash']);
1708                 unset($item['rendered-html']);
1709                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1710
1711                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1712                         $item['type'] = 'remote-comment';
1713                 } elseif ($item['type'] == 'wall') {
1714                         $item['type'] = 'remote';
1715                 }
1716
1717                 $public_shadow = self::insert($item, false, false, true);
1718
1719                 logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);
1720
1721                 // If this was a comment to a Diaspora post we don't get our comment back.
1722                 // This means that we have to distribute the comment by ourselves.
1723                 if ($origin && dba::exists('item', ['id' => $parent, 'network' => NETWORK_DIASPORA])) {
1724                         self::distribute($public_shadow);
1725                 }
1726         }
1727
1728          /**
1729          * Adds a "lang" specification in a "postopts" element of given $arr,
1730          * if possible and not already present.
1731          * Expects "body" element to exist in $arr.
1732          */
1733         private static function addLanguageInPostopts(&$item)
1734         {
1735                 $postopts = "";
1736
1737                 if (!empty($item['postopts'])) {
1738                         if (strstr($item['postopts'], 'lang=')) {
1739                                 // do not override
1740                                 return;
1741                         }
1742                         $postopts = $item['postopts'];
1743                 }
1744
1745                 $naked_body = Text\BBCode::toPlaintext($item['body'], false);
1746
1747                 $languages = (new Text_LanguageDetect())->detect($naked_body, 3);
1748
1749                 if (sizeof($languages) > 0) {
1750                         if ($postopts != '') {
1751                                 $postopts .= '&'; // arbitrary separator, to be reviewed
1752                         }
1753
1754                         $postopts .= 'lang=';
1755                         $sep = "";
1756
1757                         foreach ($languages as $language => $score) {
1758                                 $postopts .= $sep . $language . ";" . $score;
1759                                 $sep = ':';
1760                         }
1761                         $item['postopts'] = $postopts;
1762                 }
1763         }
1764
1765         /**
1766          * @brief Creates an unique guid out of a given uri
1767          *
1768          * @param string $uri uri of an item entry
1769          * @param string $host hostname for the GUID prefix
1770          * @return string unique guid
1771          */
1772         public static function guidFromUri($uri, $host)
1773         {
1774                 // Our regular guid routine is using this kind of prefix as well
1775                 // We have to avoid that different routines could accidentally create the same value
1776                 $parsed = parse_url($uri);
1777
1778                 // We use a hash of the hostname as prefix for the guid
1779                 $guid_prefix = hash("crc32", $host);
1780
1781                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1782                 unset($parsed["scheme"]);
1783
1784                 // Glue it together to be able to make a hash from it
1785                 $host_id = implode("/", $parsed);
1786
1787                 // We could use any hash algorithm since it isn't a security issue
1788                 $host_hash = hash("ripemd128", $host_id);
1789
1790                 return $guid_prefix.$host_hash;
1791         }
1792
1793         /**
1794          * generate an unique URI
1795          *
1796          * @param integer $uid User id
1797          * @param string $guid An existing GUID (Otherwise it will be generated)
1798          *
1799          * @return string
1800          */
1801         public static function newURI($uid, $guid = "")
1802         {
1803                 if ($guid == "") {
1804                         $guid = get_guid(32);
1805                 }
1806
1807                 $hostname = self::getApp()->get_hostname();
1808
1809                 $user = dba::selectFirst('user', ['nickname'], ['uid' => $uid]);
1810
1811                 $uri = "urn:X-dfrn:" . $hostname . ':' . $user['nickname'] . ':' . $guid;
1812
1813                 return $uri;
1814         }
1815
1816         /**
1817          * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
1818          *
1819          * This can be used to filter for inactive contacts.
1820          * Only do this for public postings to avoid privacy problems, since poco data is public.
1821          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1822          *
1823          * @param array $arr Contains the just posted item record
1824          */
1825         private static function updateContact($arr)
1826         {
1827                 // Unarchive the author
1828                 $contact = dba::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1829                 if (DBM::is_result($contact)) {
1830                         Contact::unmarkForArchival($contact);
1831                 }
1832
1833                 // Unarchive the contact if it's not our own contact
1834                 $contact = dba::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1835                 if (DBM::is_result($contact)) {
1836                         Contact::unmarkForArchival($contact);
1837                 }
1838
1839                 $update = (!$arr['private'] && (($arr["author-link"] === $arr["owner-link"]) || ($arr["parent-uri"] === $arr["uri"])));
1840
1841                 // Is it a forum? Then we don't care about the rules from above
1842                 if (!$update && ($arr["network"] == NETWORK_DFRN) && ($arr["parent-uri"] === $arr["uri"])) {
1843                         if (dba::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1844                                 $update = true;
1845                         }
1846                 }
1847
1848                 if ($update) {
1849                         dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1850                                 ['id' => $arr['contact-id']]);
1851                 }
1852                 // Now do the same for the system wide contacts with uid=0
1853                 if (!$arr['private']) {
1854                         dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1855                                 ['id' => $arr['owner-id']]);
1856
1857                         if ($arr['owner-id'] != $arr['author-id']) {
1858                                 dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1859                                         ['id' => $arr['author-id']]);
1860                         }
1861                 }
1862         }
1863
1864         public static function setHashtags(&$item)
1865         {
1866
1867                 $tags = get_tags($item["body"]);
1868
1869                 // No hashtags?
1870                 if (!count($tags)) {
1871                         return false;
1872                 }
1873
1874                 // This sorting is important when there are hashtags that are part of other hashtags
1875                 // Otherwise there could be problems with hashtags like #test and #test2
1876                 rsort($tags);
1877
1878                 $URLSearchString = "^\[\]";
1879
1880                 // All hashtags should point to the home server if "local_tags" is activated
1881                 if (Config::get('system', 'local_tags')) {
1882                         $item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1883                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["body"]);
1884
1885                         $item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1886                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["tag"]);
1887                 }
1888
1889                 // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1890                 $item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1891                         function ($match) {
1892                                 return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1893                         }, $item["body"]);
1894
1895                 $item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1896                         function ($match) {
1897                                 return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1898                         }, $item["body"]);
1899
1900                 $item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1901                         function ($match) {
1902                                 return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1903                         }, $item["body"]);
1904
1905                 // Repair recursive urls
1906                 $item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1907                                 "&num;$2", $item["body"]);
1908
1909                 foreach ($tags as $tag) {
1910                         if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=')) {
1911                                 continue;
1912                         }
1913
1914                         $basetag = str_replace('_',' ',substr($tag,1));
1915
1916                         $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . rawurlencode($basetag) . ']' . $basetag . '[/url]';
1917
1918                         $item["body"] = str_replace($tag, $newtag, $item["body"]);
1919
1920                         if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
1921                                 if (strlen($item["tag"])) {
1922                                         $item["tag"] = ','.$item["tag"];
1923                                 }
1924                                 $item["tag"] = $newtag.$item["tag"];
1925                         }
1926                 }
1927
1928                 // Convert back the masked hashtags
1929                 $item["body"] = str_replace("&num;", "#", $item["body"]);
1930         }
1931
1932         public static function getGuidById($id)
1933         {
1934                 $item = dba::selectFirst('item', ['guid'], ['id' => $id]);
1935                 if (DBM::is_result($item)) {
1936                         return $item['guid'];
1937                 } else {
1938                         return '';
1939                 }
1940         }
1941
1942         public static function getIdAndNickByGuid($guid, $uid = 0)
1943         {
1944                 $nick = "";
1945                 $id = 0;
1946
1947                 if ($uid == 0) {
1948                         $uid == local_user();
1949                 }
1950
1951                 // Does the given user have this item?
1952                 if ($uid) {
1953                         $item = dba::fetch_first("SELECT `item`.`id`, `user`.`nickname` FROM `item`
1954                                 INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
1955                                 WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
1956                                         AND `item`.`guid` = ? AND `item`.`uid` = ?", $guid, $uid);
1957                         if (DBM::is_result($item)) {
1958                                 $id = $item["id"];
1959                                 $nick = $item["nickname"];
1960                         }
1961                 }
1962
1963                 // Or is it anywhere on the server?
1964                 if ($nick == "") {
1965                         $item = dba::fetch_first("SELECT `item`.`id`, `user`.`nickname` FROM `item`
1966                                 INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
1967                                 WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
1968                                         AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
1969                                         AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
1970                                         AND NOT `item`.`private` AND `item`.`wall`
1971                                         AND `item`.`guid` = ?", $guid);
1972                         if (DBM::is_result($item)) {
1973                                 $id = $item["id"];
1974                                 $nick = $item["nickname"];
1975                         }
1976                 }
1977                 return ["nick" => $nick, "id" => $id];
1978         }
1979
1980         /**
1981          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1982          * @param int $uid
1983          * @param int $item_id
1984          * @return bool true if item was deleted, else false
1985          */
1986         private static function tagDeliver($uid, $item_id)
1987         {
1988                 $mention = false;
1989
1990                 $user = dba::selectFirst('user', [], ['uid' => $uid]);
1991                 if (!DBM::is_result($user)) {
1992                         return;
1993                 }
1994
1995                 $community_page = (($user['page-flags'] == PAGE_COMMUNITY) ? true : false);
1996                 $prvgroup = (($user['page-flags'] == PAGE_PRVGROUP) ? true : false);
1997
1998                 $item = dba::selectFirst('item', [], ['id' => $item_id]);
1999                 if (!DBM::is_result($item)) {
2000                         return;
2001                 }
2002
2003                 $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
2004
2005                 /*
2006                  * Diaspora uses their own hardwired link URL in @-tags
2007                  * instead of the one we supply with webfinger
2008                  */
2009                 $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
2010
2011                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2012                 if ($cnt) {
2013                         foreach ($matches as $mtch) {
2014                                 if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
2015                                         $mention = true;
2016                                         logger('mention found: ' . $mtch[2]);
2017                                 }
2018                         }
2019                 }
2020
2021                 if (!$mention) {
2022                         if (($community_page || $prvgroup) &&
2023                                   !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
2024                                 // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
2025                                 // delete it!
2026                                 logger("no-mention top-level post to community or private group. delete.");
2027                                 dba::delete('item', ['id' => $item_id]);
2028                                 return true;
2029                         }
2030                         return;
2031                 }
2032
2033                 $arr = ['item' => $item, 'user' => $user];
2034
2035                 Addon::callHooks('tagged', $arr);
2036
2037                 if (!$community_page && !$prvgroup) {
2038                         return;
2039                 }
2040
2041                 /*
2042                  * tgroup delivery - setup a second delivery chain
2043                  * prevent delivery looping - only proceed
2044                  * if the message originated elsewhere and is a top-level post
2045                  */
2046                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2047                         return;
2048                 }
2049
2050                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2051                 $self = dba::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2052                 if (!DBM::is_result($self)) {
2053                         return;
2054                 }
2055
2056                 $owner_id = Contact::getIdForURL($self['url']);
2057
2058                 // also reset all the privacy bits to the forum default permissions
2059
2060                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
2061
2062                 $forum_mode = ($prvgroup ? 2 : 1);
2063
2064                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2065                         'owner-id' => $owner_id, 'owner-link' => $self['url'], 'private' => $private, 'allow_cid' => $user['allow_cid'],
2066                         'allow_gid' => $user['allow_gid'], 'deny_cid' => $user['deny_cid'], 'deny_gid' => $user['deny_gid']];
2067                 dba::update('item', $fields, ['id' => $item_id]);
2068
2069                 self::updateThread($item_id);
2070
2071                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', 'tgroup', $item_id);
2072         }
2073
2074         public static function isRemoteSelf($contact, &$datarray)
2075         {
2076                 $a = get_app();
2077
2078                 if (!$contact['remote_self']) {
2079                         return false;
2080                 }
2081
2082                 // Prevent the forwarding of posts that are forwarded
2083                 if ($datarray["extid"] == NETWORK_DFRN) {
2084                         logger('Already forwarded', LOGGER_DEBUG);
2085                         return false;
2086                 }
2087
2088                 // Prevent to forward already forwarded posts
2089                 if ($datarray["app"] == $a->get_hostname()) {
2090                         logger('Already forwarded (second test)', LOGGER_DEBUG);
2091                         return false;
2092                 }
2093
2094                 // Only forward posts
2095                 if ($datarray["verb"] != ACTIVITY_POST) {
2096                         logger('No post', LOGGER_DEBUG);
2097                         return false;
2098                 }
2099
2100                 if (($contact['network'] != NETWORK_FEED) && $datarray['private']) {
2101                         logger('Not public', LOGGER_DEBUG);
2102                         return false;
2103                 }
2104
2105                 $datarray2 = $datarray;
2106                 logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
2107                 if ($contact['remote_self'] == 2) {
2108                         $self = dba::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2109                                         ['uid' => $contact['uid'], 'self' => true]);
2110                         if (DBM::is_result($self)) {
2111                                 $datarray['contact-id'] = $self["id"];
2112
2113                                 $datarray['owner-name'] = $self["name"];
2114                                 $datarray['owner-link'] = $self["url"];
2115                                 $datarray['owner-avatar'] = $self["thumb"];
2116
2117                                 $datarray['author-name']   = $datarray['owner-name'];
2118                                 $datarray['author-link']   = $datarray['owner-link'];
2119                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2120
2121                                 unset($datarray['created']);
2122                                 unset($datarray['edited']);
2123
2124                                 unset($datarray['network']);
2125                                 unset($datarray['owner-id']);
2126                                 unset($datarray['author-id']);
2127                         }
2128
2129                         if ($contact['network'] != NETWORK_FEED) {
2130                                 $datarray["guid"] = get_guid(32);
2131                                 unset($datarray["plink"]);
2132                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2133                                 $datarray["parent-uri"] = $datarray["uri"];
2134                                 $datarray["thr-parent"] = $datarray["uri"];
2135                                 $datarray["extid"] = NETWORK_DFRN;
2136                                 $urlpart = parse_url($datarray2['author-link']);
2137                                 $datarray["app"] = $urlpart["host"];
2138                         } else {
2139                                 $datarray['private'] = 0;
2140                         }
2141                 }
2142
2143                 if ($contact['network'] != NETWORK_FEED) {
2144                         // Store the original post
2145                         $result = self::insert($datarray2, false, false);
2146                         logger('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
2147                 } else {
2148                         $datarray["app"] = "Feed";
2149                         $result = true;
2150                 }
2151
2152                 // Trigger automatic reactions for addons
2153                 $datarray['api_source'] = true;
2154
2155                 // We have to tell the hooks who we are - this really should be improved
2156                 $_SESSION["authenticated"] = true;
2157                 $_SESSION["uid"] = $contact['uid'];
2158
2159                 return $result;
2160         }
2161
2162         /**
2163          *
2164          * @param string $s
2165          * @param int    $uid
2166          * @param array  $item
2167          * @param int    $cid
2168          * @return string
2169          */
2170         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2171         {
2172                 if (Config::get('system', 'disable_embedded')) {
2173                         return $s;
2174                 }
2175
2176                 logger('check for photos', LOGGER_DEBUG);
2177                 $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
2178
2179                 $orig_body = $s;
2180                 $new_body = '';
2181
2182                 $img_start = strpos($orig_body, '[img');
2183                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2184                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2185
2186                 while (($img_st_close !== false) && ($img_len !== false)) {
2187                         $img_st_close++; // make it point to AFTER the closing bracket
2188                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2189
2190                         logger('found photo ' . $image, LOGGER_DEBUG);
2191
2192                         if (stristr($image, $site . '/photo/')) {
2193                                 // Only embed locally hosted photos
2194                                 $replace = false;
2195                                 $i = basename($image);
2196                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2197                                 $x = strpos($i, '-');
2198
2199                                 if ($x) {
2200                                         $res = substr($i, $x + 1);
2201                                         $i = substr($i, 0, $x);
2202                                         $fields = ['data', 'type', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
2203                                         $photo = dba::selectFirst('photo', $fields, ['resource-id' => $i, 'scale' => $res, 'uid' => $uid]);
2204                                         if (DBM::is_result($photo)) {
2205                                                 /*
2206                                                  * Check to see if we should replace this photo link with an embedded image
2207                                                  * 1. No need to do so if the photo is public
2208                                                  * 2. If there's a contact-id provided, see if they're in the access list
2209                                                  *    for the photo. If so, embed it.
2210                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2211                                                  *    permissions, regardless of order but first check to see if they're an exact
2212                                                  *    match to save some processing overhead.
2213                                                  */
2214                                                 if (self::hasPermissions($photo)) {
2215                                                         if ($cid) {
2216                                                                 $recips = self::enumeratePermissions($photo);
2217                                                                 if (in_array($cid, $recips)) {
2218                                                                         $replace = true;
2219                                                                 }
2220                                                         } elseif ($item) {
2221                                                                 if (self::samePermissions($item, $photo)) {
2222                                                                         $replace = true;
2223                                                                 }
2224                                                         }
2225                                                 }
2226                                                 if ($replace) {
2227                                                         $data = $photo['data'];
2228                                                         $type = $photo['type'];
2229
2230                                                         // If a custom width and height were specified, apply before embedding
2231                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2232                                                                 logger('scaling photo', LOGGER_DEBUG);
2233
2234                                                                 $width = intval($match[1]);
2235                                                                 $height = intval($match[2]);
2236
2237                                                                 $Image = new Image($data, $type);
2238                                                                 if ($Image->isValid()) {
2239                                                                         $Image->scaleDown(max($width, $height));
2240                                                                         $data = $Image->asString();
2241                                                                         $type = $Image->getType();
2242                                                                 }
2243                                                         }
2244
2245                                                         logger('replacing photo', LOGGER_DEBUG);
2246                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2247                                                         logger('replaced: ' . $image, LOGGER_DATA);
2248                                                 }
2249                                         }
2250                                 }
2251                         }
2252
2253                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2254                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2255                         if ($orig_body === false) {
2256                                 $orig_body = '';
2257                         }
2258
2259                         $img_start = strpos($orig_body, '[img');
2260                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2261                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2262                 }
2263
2264                 $new_body = $new_body . $orig_body;
2265
2266                 return $new_body;
2267         }
2268
2269         private static function hasPermissions($obj)
2270         {
2271                 return (
2272                         (
2273                                 x($obj, 'allow_cid')
2274                         ) || (
2275                                 x($obj, 'allow_gid')
2276                         ) || (
2277                                 x($obj, 'deny_cid')
2278                         ) || (
2279                                 x($obj, 'deny_gid')
2280                         )
2281                 );
2282         }
2283
2284         private static function samePermissions($obj1, $obj2)
2285         {
2286                 // first part is easy. Check that these are exactly the same.
2287                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2288                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2289                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2290                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2291                         return true;
2292                 }
2293
2294                 // This is harder. Parse all the permissions and compare the resulting set.
2295                 $recipients1 = self::enumeratePermissions($obj1);
2296                 $recipients2 = self::enumeratePermissions($obj2);
2297                 sort($recipients1);
2298                 sort($recipients2);
2299
2300                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2301                 return ($recipients1 == $recipients2);
2302         }
2303
2304         // returns an array of contact-ids that are allowed to see this object
2305         private static function enumeratePermissions($obj)
2306         {
2307                 $allow_people = expand_acl($obj['allow_cid']);
2308                 $allow_groups = Group::expand(expand_acl($obj['allow_gid']));
2309                 $deny_people  = expand_acl($obj['deny_cid']);
2310                 $deny_groups  = Group::expand(expand_acl($obj['deny_gid']));
2311                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2312                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2313                 $recipients   = array_diff($recipients, $deny);
2314                 return $recipients;
2315         }
2316
2317         public static function getFeedTags($item)
2318         {
2319                 $ret = [];
2320                 $matches = false;
2321                 $cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2322                 if ($cnt) {
2323                         for ($x = 0; $x < $cnt; $x ++) {
2324                                 if ($matches[1][$x]) {
2325                                         $ret[$matches[2][$x]] = ['#', $matches[1][$x], $matches[2][$x]];
2326                                 }
2327                         }
2328                 }
2329                 $matches = false;
2330                 $cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2331                 if ($cnt) {
2332                         for ($x = 0; $x < $cnt; $x ++) {
2333                                 if ($matches[1][$x]) {
2334                                         $ret[] = ['@', $matches[1][$x], $matches[2][$x]];
2335                                 }
2336                         }
2337                 }
2338                 return $ret;
2339         }
2340
2341         public static function expire($uid, $days, $network = "", $force = false)
2342         {
2343                 if (!$uid || ($days < 1)) {
2344                         return;
2345                 }
2346
2347                 /*
2348                  * $expire_network_only = save your own wall posts
2349                  * and just expire conversations started by others
2350                  */
2351                 $expire_network_only = PConfig::get($uid,'expire', 'network_only');
2352                 $sql_extra = (intval($expire_network_only) ? " AND wall = 0 " : "");
2353
2354                 if ($network != "") {
2355                         $sql_extra .= sprintf(" AND network = '%s' ", dbesc($network));
2356
2357                         /*
2358                          * There is an index "uid_network_received" but not "uid_network_created"
2359                          * This avoids the creation of another index just for one purpose.
2360                          * And it doesn't really matter wether to look at "received" or "created"
2361                          */
2362                         $range = "AND `received` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
2363                 } else {
2364                         $range = "AND `created` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
2365                 }
2366
2367                 $r = q("SELECT `file`, `resource-id`, `starred`, `type`, `id` FROM `item`
2368                         WHERE `uid` = %d $range
2369                         AND `id` = `parent`
2370                         $sql_extra
2371                         AND `deleted` = 0",
2372                         intval($uid),
2373                         intval($days)
2374                 );
2375
2376                 if (!DBM::is_result($r)) {
2377                         return;
2378                 }
2379
2380                 $expire_items = PConfig::get($uid, 'expire', 'items', 1);
2381
2382                 // Forcing expiring of items - but not notes and marked items
2383                 if ($force) {
2384                         $expire_items = true;
2385                 }
2386
2387                 $expire_notes = PConfig::get($uid, 'expire', 'notes', 1);
2388                 $expire_starred = PConfig::get($uid, 'expire', 'starred', 1);
2389                 $expire_photos = PConfig::get($uid, 'expire', 'photos', 0);
2390
2391                 logger('User '.$uid.': expire: # items=' . count($r). "; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2392
2393                 foreach ($r as $item) {
2394
2395                         // don't expire filed items
2396
2397                         if (strpos($item['file'],'[') !== false) {
2398                                 continue;
2399                         }
2400
2401                         // Only expire posts, not photos and photo comments
2402
2403                         if ($expire_photos == 0 && strlen($item['resource-id'])) {
2404                                 continue;
2405                         } elseif ($expire_starred == 0 && intval($item['starred'])) {
2406                                 continue;
2407                         } elseif ($expire_notes == 0 && $item['type'] == 'note') {
2408                                 continue;
2409                         } elseif ($expire_items == 0 && $item['type'] != 'note') {
2410                                 continue;
2411                         }
2412
2413                         self::deleteById($item['id'], PRIORITY_LOW);
2414                 }
2415         }
2416
2417         public static function firstPostDate($uid, $wall = false)
2418         {
2419                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2420                 $params = ['order' => ['created' => false]];
2421                 $thread = dba::selectFirst('thread', ['created'], $condition, $params);
2422                 if (DBM::is_result($thread)) {
2423                         return substr(DateTimeFormat::local($thread['created']), 0, 10);
2424                 }
2425                 return false;
2426         }
2427
2428         /**
2429          * @brief add/remove activity to an item
2430          *
2431          * Toggle activities as like,dislike,attend of an item
2432          *
2433          * @param string $item_id
2434          * @param string $verb
2435          *              Activity verb. One of
2436          *                      like, unlike, dislike, undislike, attendyes, unattendyes,
2437          *                      attendno, unattendno, attendmaybe, unattendmaybe
2438          * @hook 'post_local_end'
2439          *              array $arr
2440          *                      'post_id' => ID of posted item
2441          */
2442         public static function performLike($item_id, $verb)
2443         {
2444                 if (!local_user() && !remote_user()) {
2445                         return false;
2446                 }
2447
2448                 switch ($verb) {
2449                         case 'like':
2450                         case 'unlike':
2451                                 $bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
2452                                 $activity = ACTIVITY_LIKE;
2453                                 break;
2454                         case 'dislike':
2455                         case 'undislike':
2456                                 $bodyverb = L10n::t('%1$s doesn\'t like %2$s\'s %3$s');
2457                                 $activity = ACTIVITY_DISLIKE;
2458                                 break;
2459                         case 'attendyes':
2460                         case 'unattendyes':
2461                                 $bodyverb = L10n::t('%1$s is attending %2$s\'s %3$s');
2462                                 $activity = ACTIVITY_ATTEND;
2463                                 break;
2464                         case 'attendno':
2465                         case 'unattendno':
2466                                 $bodyverb = L10n::t('%1$s is not attending %2$s\'s %3$s');
2467                                 $activity = ACTIVITY_ATTENDNO;
2468                                 break;
2469                         case 'attendmaybe':
2470                         case 'unattendmaybe':
2471                                 $bodyverb = L10n::t('%1$s may attend %2$s\'s %3$s');
2472                                 $activity = ACTIVITY_ATTENDMAYBE;
2473                                 break;
2474                         default:
2475                                 logger('like: unknown verb ' . $verb . ' for item ' . $item_id);
2476                                 return false;
2477                 }
2478
2479                 // Enable activity toggling instead of on/off
2480                 $event_verb_flag = $activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE;
2481
2482                 logger('like: verb ' . $verb . ' item ' . $item_id);
2483
2484                 $item = dba::selectFirst('item', [], ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
2485                 if (!DBM::is_result($item)) {
2486                         logger('like: unknown item ' . $item_id);
2487                         return false;
2488                 }
2489
2490                 $uid = $item['uid'];
2491                 if (($uid == 0) && local_user()) {
2492                         $uid = local_user();
2493                 }
2494
2495                 if (!can_write_wall($uid)) {
2496                         logger('like: unable to write on wall ' . $uid);
2497                         return false;
2498                 }
2499
2500                 // Retrieves the local post owner
2501                 $owner_self_contact = dba::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
2502                 if (!DBM::is_result($owner_self_contact)) {
2503                         logger('like: unknown owner ' . $uid);
2504                         return false;
2505                 }
2506
2507                 // Retrieve the current logged in user's public contact
2508                 $author_id = public_contact();
2509
2510                 $author_contact = dba::selectFirst('contact', [], ['id' => $author_id]);
2511                 if (!DBM::is_result($author_contact)) {
2512                         logger('like: unknown author ' . $author_id);
2513                         return false;
2514                 }
2515
2516                 // Contact-id is the uid-dependant author contact
2517                 if (local_user() == $uid) {
2518                         $item_contact_id = $owner_self_contact['id'];
2519                         $item_contact = $owner_self_contact;
2520                 } else {
2521                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
2522                         $item_contact = dba::selectFirst('contact', [], ['id' => $item_contact_id]);
2523                         if (!DBM::is_result($item_contact)) {
2524                                 logger('like: unknown item contact ' . $item_contact_id);
2525                                 return false;
2526                         }
2527                 }
2528
2529                 // Look for an existing verb row
2530                 // event participation are essentially radio toggles. If you make a subsequent choice,
2531                 // we need to eradicate your first choice.
2532                 if ($event_verb_flag) {
2533                         $verbs = "'" . dbesc(ACTIVITY_ATTEND) . "', '" . dbesc(ACTIVITY_ATTENDNO) . "', '" . dbesc(ACTIVITY_ATTENDMAYBE) . "'";
2534                 } else {
2535                         $verbs = "'".dbesc($activity)."'";
2536                 }
2537
2538                 /// @todo This query is expected to be a performance eater due to the "OR" - it has to be changed totally
2539                 $existing_like = q("SELECT `id`, `guid`, `verb` FROM `item`
2540                         WHERE `verb` IN ($verbs)
2541                         AND `deleted` = 0
2542                         AND `author-id` = %d
2543                         AND `uid` = %d
2544                         AND (`parent` = '%s' OR `parent-uri` = '%s' OR `thr-parent` = '%s')
2545                         LIMIT 1",
2546                         intval($author_contact['id']),
2547                         intval($item['uid']),
2548                         dbesc($item_id), dbesc($item_id), dbesc($item['uri'])
2549                 );
2550
2551                 // If it exists, mark it as deleted
2552                 if (DBM::is_result($existing_like)) {
2553                         $like_item = $existing_like[0];
2554
2555                         // Already voted, undo it
2556                         $fields = ['deleted' => true, 'unseen' => true, 'changed' => DateTimeFormat::utcNow()];
2557                         dba::update('item', $fields, ['id' => $like_item['id']]);
2558
2559                         // Clean up the Diaspora signatures for this like
2560                         // Go ahead and do it even if Diaspora support is disabled. We still want to clean up
2561                         // if it had been enabled in the past
2562                         dba::delete('sign', ['iid' => $like_item['id']]);
2563
2564                         $like_item_id = $like_item['id'];
2565                         Worker::add(PRIORITY_HIGH, "Notifier", "like", $like_item_id);
2566
2567                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2568                                 return true;
2569                         }
2570                 }
2571
2572                 // Verb is "un-something", just trying to delete existing entries
2573                 if (strpos($verb, 'un') === 0) {
2574                         return true;
2575                 }
2576
2577                 // Else or if event verb different from existing row, create a new item row
2578                 $post_type = (($item['resource-id']) ? L10n::t('photo') : L10n::t('status'));
2579                 if ($item['object-type'] === ACTIVITY_OBJ_EVENT) {
2580                         $post_type = L10n::t('event');
2581                 }
2582                 $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE ;
2583                 $link = xmlify('<link rel="alternate" type="text/html" href="' . System::baseUrl() . '/display/' . $owner_self_contact['nick'] . '/' . $item['id'] . '" />' . "\n") ;
2584                 $body = $item['body'];
2585
2586                 $obj = <<< EOT
2587
2588                 <object>
2589                         <type>$objtype</type>
2590                         <local>1</local>
2591                         <id>{$item['uri']}</id>
2592                         <link>$link</link>
2593                         <title></title>
2594                         <content>$body</content>
2595                 </object>
2596 EOT;
2597
2598                 $ulink = '[url=' . $author_contact['url'] . ']' . $author_contact['name'] . '[/url]';
2599                 $alink = '[url=' . $item['author-link'] . ']' . $item['author-name'] . '[/url]';
2600                 $plink = '[url=' . System::baseUrl() . '/display/' . $owner_self_contact['nick'] . '/' . $item['id'] . ']' . $post_type . '[/url]';
2601
2602                 $new_item = [
2603                         'guid'          => get_guid(32),
2604                         'uri'           => self::newURI($item['uid']),
2605                         'uid'           => $item['uid'],
2606                         'contact-id'    => $item_contact_id,
2607                         'type'          => 'activity',
2608                         'wall'          => $item['wall'],
2609                         'origin'        => 1,
2610                         'gravity'       => GRAVITY_LIKE,
2611                         'parent'        => $item['id'],
2612                         'parent-uri'    => $item['uri'],
2613                         'thr-parent'    => $item['uri'],
2614                         'owner-id'      => $item['owner-id'],
2615                         'owner-name'    => $item['owner-name'],
2616                         'owner-link'    => $item['owner-link'],
2617                         'owner-avatar'  => $item['owner-avatar'],
2618                         'author-id'     => $author_contact['id'],
2619                         'author-name'   => $author_contact['name'],
2620                         'author-link'   => $author_contact['url'],
2621                         'author-avatar' => $author_contact['thumb'],
2622                         'body'          => sprintf($bodyverb, $ulink, $alink, $plink),
2623                         'verb'          => $activity,
2624                         'object-type'   => $objtype,
2625                         'object'        => $obj,
2626                         'allow_cid'     => $item['allow_cid'],
2627                         'allow_gid'     => $item['allow_gid'],
2628                         'deny_cid'      => $item['deny_cid'],
2629                         'deny_gid'      => $item['deny_gid'],
2630                         'visible'       => 1,
2631                         'unseen'        => 1,
2632                 ];
2633
2634                 $new_item_id = self::insert($new_item);
2635
2636                 // If the parent item isn't visible then set it to visible
2637                 if (!$item['visible']) {
2638                         self::update(['visible' => true], ['id' => $item['id']]);
2639                 }
2640
2641                 // Save the author information for the like in case we need to relay to Diaspora
2642                 Diaspora::storeLikeSignature($item_contact, $new_item_id);
2643
2644                 $new_item['id'] = $new_item_id;
2645
2646                 Addon::callHooks('post_local_end', $new_item);
2647
2648                 Worker::add(PRIORITY_HIGH, "Notifier", "like", $new_item_id);
2649
2650                 return true;
2651         }
2652
2653         private static function addThread($itemid, $onlyshadow = false)
2654         {
2655                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2656                         'moderated', 'visible', 'starred', 'bookmark', 'contact-id',
2657                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2658                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2659                 $item = dba::selectFirst('item', $fields, $condition);
2660
2661                 if (!DBM::is_result($item)) {
2662                         return;
2663                 }
2664
2665                 $item['iid'] = $itemid;
2666
2667                 if (!$onlyshadow) {
2668                         $result = dba::insert('thread', $item);
2669
2670                         logger("Add thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
2671                 }
2672         }
2673
2674         private static function updateThread($itemid, $setmention = false)
2675         {
2676                 $fields = ['uid', 'guid', 'title', 'body', 'created', 'edited', 'commented', 'received', 'changed',
2677                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark', 'contact-id',
2678                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id', 'rendered-html', 'rendered-hash'];
2679                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2680
2681                 $item = dba::selectFirst('item', $fields, $condition);
2682                 if (!DBM::is_result($item)) {
2683                         return;
2684                 }
2685
2686                 if ($setmention) {
2687                         $item["mention"] = 1;
2688                 }
2689
2690                 $sql = "";
2691
2692                 $fields = [];
2693
2694                 foreach ($item as $field => $data) {
2695                         if (!in_array($field, ["guid", "title", "body", "rendered-html", "rendered-hash"])) {
2696                                 $fields[$field] = $data;
2697                         }
2698                 }
2699
2700                 $result = dba::update('thread', $fields, ['iid' => $itemid]);
2701
2702                 logger("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, LOGGER_DEBUG);
2703
2704                 // Updating a shadow item entry
2705                 $items = dba::selectFirst('item', ['id'], ['guid' => $item['guid'], 'uid' => 0]);
2706
2707                 if (!DBM::is_result($items)) {
2708                         return;
2709                 }
2710
2711                 $fields = ['title' => $item['title'], 'body' => $item['body'],
2712                         'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2713                 $result = dba::update('item', $fields, ['id' => $items['id']]);
2714
2715                 logger("Updating public shadow for post ".$items["id"]." - guid ".$item["guid"]." Result: ".print_r($result, true), LOGGER_DEBUG);
2716         }
2717
2718         private static function deleteThread($itemid, $itemuri = "")
2719         {
2720                 $item = dba::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2721                 if (!DBM::is_result($item)) {
2722                         logger('No thread found for id '.$itemid, LOGGER_DEBUG);
2723                         return;
2724                 }
2725
2726                 // Using dba::delete at this time could delete the associated item entries
2727                 $result = dba::e("DELETE FROM `thread` WHERE `iid` = ?", $itemid);
2728
2729                 logger("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
2730
2731                 if ($itemuri != "") {
2732                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
2733                         if (!dba::exists('item', $condition)) {
2734                                 dba::delete('item', ['uri' => $itemuri, 'uid' => 0]);
2735                                 logger("deleteThread: Deleted shadow for item ".$itemuri, LOGGER_DEBUG);
2736                         }
2737                 }
2738         }
2739 }