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