src/Model/Item.php

   1 <?php
   2
   3 /**
   4  * @file src/Model/Item.php
   5  */
   6
   7 namespace Friendica\Model;
   8
   9 use Friendica\BaseObject;
  10 use Friendica\Content\Text;
  11 use Friendica\Core\Addon;
  12 use Friendica\Core\Config;
  13 use Friendica\Core\L10n;
  14 use Friendica\Core\PConfig;
  15 use Friendica\Core\System;
  16 use Friendica\Core\Worker;
  17 use Friendica\Database\DBM;
  18 use Friendica\Model\Contact;
  19 use Friendica\Model\Conversation;
  20 use Friendica\Model\Group;
  21 use Friendica\Model\Term;
  22 use Friendica\Object\Image;
  23 use Friendica\Protocol\Diaspora;
  24 use Friendica\Protocol\OStatus;
  25 use Friendica\Util\DateTimeFormat;
  26 use Friendica\Util\XML;
  27 use dba;
  28 use Text_LanguageDetect;
  29
  30 require_once 'boot.php';
  31 require_once 'include/items.php';
  32 require_once 'include/text.php';
  33
  34 class Item extends BaseObject
  35 {
  36         // Field list that is used to display the items
  37         const DISPLAY_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network',
  38                         'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  39                         'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'attach',
  40                         'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  41                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  42                         'author-id', 'author-link', 'author-name', 'author-avatar',
  43                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar',
  44                         'contact-id', 'contact-link', 'contact-name', 'contact-avatar',
  45                         'writable', 'self', 'cid', 'alias',
  46                         'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  47                         'event-summary', 'event-desc', 'event-location', 'event-type',
  48                         'event-nofinish', 'event-adjust', 'event-ignore', 'event-id'];
  49
  50         // Field list that is used to deliver items via the protocols
  51         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid',
  52                         'created', 'edited', 'verb', 'object-type', 'object', 'target',
  53                         'private', 'title', 'body', 'location', 'coord', 'app',
  54                         'attach', 'tag', 'bookmark', 'deleted', 'extid',
  55                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  56                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  57                         'signed_text', 'signature', 'signer'];
  58
  59         const CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
  60                         'coord', 'app', 'rendered-hash', 'rendered-html',
  61                         'object-type', 'object', 'target-type', 'target'];
  62
  63         /**
  64          * @brief Fetch a single item row
  65          *
  66          * @param mixed $stmt statement object
  67          * @return array current row
  68          */
  69         public static function fetch($stmt)
  70         {
  71                 $row = dba::fetch($stmt);
  72
  73                 // Fetch data from the item-content table whenever there is content there
  74                 foreach (self::CONTENT_FIELDLIST as $field) {
  75                         if (is_null($row[$field]) && !is_null($row['item-' . $field])) {
  76                                 $row[$field] = $row['item-' . $field];
  77                         }
  78                         unset($row['item-' . $field]);
  79                 }
  80
  81                 // We prefer the data from the user's contact over the public one
  82                 if (!empty($row['author-link']) && !empty($row['contact-link']) &&
  83                         ($row['author-link'] == $row['contact-link'])) {
  84                         if (isset($row['author-avatar']) && !empty($row['contact-avatar'])) {
  85                                 $row['author-avatar'] = $row['contact-avatar'];
  86                         }
  87                         if (isset($row['author-name']) && !empty($row['contact-name'])) {
  88                                 $row['author-name'] = $row['contact-name'];
  89                         }
  90                 }
  91
  92                 if (!empty($row['owner-link']) && !empty($row['contact-link']) &&
  93                         ($row['owner-link'] == $row['contact-link'])) {
  94                         if (isset($row['owner-avatar']) && !empty($row['contact-avatar'])) {
  95                                 $row['owner-avatar'] = $row['contact-avatar'];
  96                         }
  97                         if (isset($row['owner-name']) && !empty($row['contact-name'])) {
  98                                 $row['owner-name'] = $row['contact-name'];
  99                         }
 100                 }
 101
 102                 // We can always comment on posts from these networks
 103                 if (isset($row['writable']) && !empty($row['network']) &&
 104                         in_array($row['network'], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS])) {
 105                         $row['writable'] = true;
 106                 }
 107
 108                 return $row;
 109         }
 110
 111         /**
 112          * @brief Fills an array with data from an item query
 113          *
 114          * @param object $stmt statement object
 115          * @return array Data array
 116          */
 117         public static function inArray($stmt, $do_close = true) {
 118                 if (is_bool($stmt)) {
 119                         return $stmt;
 120                 }
 121
 122                 $data = [];
 123                 while ($row = self::fetch($stmt)) {
 124                         $data[] = $row;
 125                 }
 126                 if ($do_close) {
 127                         dba::close($stmt);
 128                 }
 129                 return $data;
 130         }
 131
 132         /**
 133          * Retrieve a single record from the item table for a given user and returns it in an associative array
 134          *
 135          * @brief Retrieve a single record from a table
 136          * @param integer $uid User ID
 137          * @param array  $fields
 138          * @param array  $condition
 139          * @param array  $params
 140          * @return bool|array
 141          * @see dba::select
 142          */
 143         public static function selectFirstForUser($uid, array $selected = [], array $condition = [], $params = [])
 144         {
 145                 $params['uid'] = $uid;
 146
 147                 if (empty($selected)) {
 148                         $selected = Item::DISPLAY_FIELDLIST;
 149                 }
 150
 151                 return self::selectFirst($selected, $condition, $params);
 152         }
 153
 154         /**
 155          * @brief Select rows from the item table for a given user
 156          *
 157          * @param integer $uid User ID
 158          * @param array  $selected  Array of selected fields, empty for all
 159          * @param array  $condition Array of fields for condition
 160          * @param array  $params    Array of several parameters
 161          *
 162          * @return boolean|object
 163          */
 164         public static function selectForUser($uid, array $selected = [], array $condition = [], $params = [])
 165         {
 166                 $params['uid'] = $uid;
 167
 168                 if (empty($selected)) {
 169                         $selected = Item::DISPLAY_FIELDLIST;
 170                 }
 171
 172                 return self::select($selected, $condition, $params);
 173         }
 174
 175         /**
 176          * Retrieve a single record from the item table and returns it in an associative array
 177          *
 178          * @brief Retrieve a single record from a table
 179          * @param array  $fields
 180          * @param array  $condition
 181          * @param array  $params
 182          * @return bool|array
 183          * @see dba::select
 184          */
 185         public static function selectFirst(array $fields = [], array $condition = [], $params = [])
 186         {
 187                 $params['limit'] = 1;
 188
 189                 $result = self::select($fields, $condition, $params);
 190
 191                 if (is_bool($result)) {
 192                         return $result;
 193                 } else {
 194                         $row = self::fetch($result);
 195                         dba::close($result);
 196                         return $row;
 197                 }
 198         }
 199
 200         /**
 201          * @brief Select rows from the item table
 202          *
 203          * @param array  $selected  Array of selected fields, empty for all
 204          * @param array  $condition Array of fields for condition
 205          * @param array  $params    Array of several parameters
 206          *
 207          * @return boolean|object
 208          */
 209         public static function select(array $selected = [], array $condition = [], $params = [])
 210         {
 211                 $uid = 0;
 212                 $usermode = false;
 213
 214                 if (isset($params['uid'])) {
 215                         $uid = $params['uid'];
 216                         $usermode = true;
 217                 }
 218
 219                 $fields = self::fieldlist($selected);
 220
 221                 $select_fields = self::constructSelectFields($fields, $selected);
 222
 223                 $condition_string = dba::buildCondition($condition);
 224
 225                 $condition_string = self::addTablesToFields($condition_string, $fields);
 226
 227                 if ($usermode) {
 228                         $condition_string = $condition_string . ' AND ' . self::condition(false);
 229                 }
 230
 231                 $param_string = self::addTablesToFields(dba::buildParameter($params), $fields);
 232
 233                 $table = "`item` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, false);
 234
 235                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 236
 237                 return dba::p($sql, $condition);
 238         }
 239
 240         /**
 241          * @brief Select rows from the starting post in the item table
 242          *
 243          * @param integer $uid User ID
 244          * @param array  $fields    Array of selected fields, empty for all
 245          * @param array  $condition Array of fields for condition
 246          * @param array  $params    Array of several parameters
 247          *
 248          * @return boolean|object
 249          */
 250         public static function selectThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 251         {
 252                 $params['uid'] = $uid;
 253
 254                 if (empty($selected)) {
 255                         $selected = Item::DISPLAY_FIELDLIST;
 256                 }
 257
 258                 return self::selectThread($selected, $condition, $params);
 259         }
 260
 261         /**
 262          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 263          *
 264          * @brief Retrieve a single record from a table
 265          * @param integer $uid User ID
 266          * @param array  $selected
 267          * @param array  $condition
 268          * @param array  $params
 269          * @return bool|array
 270          * @see dba::select
 271          */
 272         public static function selectFirstThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 273         {
 274                 $params['uid'] = $uid;
 275
 276                 if (empty($selected)) {
 277                         $selected = Item::DISPLAY_FIELDLIST;
 278                 }
 279
 280                 return self::selectFirstThread($selected, $condition, $params);
 281         }
 282
 283         /**
 284          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 285          *
 286          * @brief Retrieve a single record from a table
 287          * @param array  $fields
 288          * @param array  $condition
 289          * @param array  $params
 290          * @return bool|array
 291          * @see dba::select
 292          */
 293         public static function selectFirstThread(array $fields = [], array $condition = [], $params = [])
 294         {
 295                 $params['limit'] = 1;
 296                 $result = self::selectThread($fields, $condition, $params);
 297
 298                 if (is_bool($result)) {
 299                         return $result;
 300                 } else {
 301                         $row = self::fetch($result);
 302                         dba::close($result);
 303                         return $row;
 304                 }
 305         }
 306
 307         /**
 308          * @brief Select rows from the starting post in the item table
 309          *
 310          * @param array  $selected  Array of selected fields, empty for all
 311          * @param array  $condition Array of fields for condition
 312          * @param array  $params    Array of several parameters
 313          *
 314          * @return boolean|object
 315          */
 316         public static function selectThread(array $selected = [], array $condition = [], $params = [])
 317         {
 318                 $uid = 0;
 319                 $usermode = false;
 320
 321                 if (isset($params['uid'])) {
 322                         $uid = $params['uid'];
 323                         $usermode = true;
 324                 }
 325
 326                 $fields = self::fieldlist($selected);
 327
 328                 $threadfields = ['thread' => ['iid', 'uid', 'contact-id', 'owner-id', 'author-id',
 329                         'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private',
 330                         'pubmail', 'moderated', 'visible', 'starred', 'ignored', 'bookmark',
 331                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'network']];
 332
 333                 $select_fields = self::constructSelectFields($fields, $selected);
 334
 335                 $condition_string = dba::buildCondition($condition);
 336
 337                 $condition_string = self::addTablesToFields($condition_string, $threadfields);
 338                 $condition_string = self::addTablesToFields($condition_string, $fields);
 339
 340                 if ($usermode) {
 341                         $condition_string = $condition_string . ' AND ' . self::condition(true);
 342                 }
 343
 344                 $param_string = dba::buildParameter($params);
 345                 $param_string = self::addTablesToFields($param_string, $threadfields);
 346                 $param_string = self::addTablesToFields($param_string, $fields);
 347
 348                 $table = "`thread` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, true);
 349
 350                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 351
 352                 return dba::p($sql, $condition);
 353         }
 354
 355         /**
 356          * @brief Returns a list of fields that are associated with the item table
 357          *
 358          * @return array field list
 359          */
 360         private static function fieldlist($selected)
 361         {
 362                 $fields = [];
 363
 364                 $fields['item'] = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent', 'guid',
 365                         'contact-id', 'owner-id', 'author-id', 'type', 'wall', 'gravity', 'extid',
 366                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 367                         'postopts', 'plink', 'resource-id', 'event-id', 'tag', 'attach', 'inform',
 368                         'file', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 369                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 370                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global',
 371                         'id' => 'item_id', 'network'];
 372
 373                 $fields['item-content'] = self::CONTENT_FIELDLIST;
 374
 375                 $fields['author'] = ['url' => 'author-link', 'name' => 'author-name',
 376                         'thumb' => 'author-avatar', 'nick' => 'author-nick'];
 377
 378                 $fields['owner'] = ['url' => 'owner-link', 'name' => 'owner-name',
 379                         'thumb' => 'owner-avatar', 'nick' => 'owner-nick'];
 380
 381                 $fields['contact'] = ['url' => 'contact-link', 'name' => 'contact-name', 'thumb' => 'contact-avatar',
 382                         'writable', 'self', 'id' => 'cid', 'alias', 'uid' => 'contact-uid',
 383                         'photo', 'name-date', 'uri-date', 'avatar-date', 'thumb', 'dfrn-id'];
 384
 385                 $fields['parent-item'] = ['guid' => 'parent-guid', 'network' => 'parent-network'];
 386
 387                 $fields['parent-item-author'] = ['url' => 'parent-author-link', 'name' => 'parent-author-name'];
 388
 389                 $fields['event'] = ['created' => 'event-created', 'edited' => 'event-edited',
 390                         'start' => 'event-start','finish' => 'event-finish',
 391                         'summary' => 'event-summary','desc' => 'event-desc',
 392                         'location' => 'event-location', 'type' => 'event-type',
 393                         'nofinish' => 'event-nofinish','adjust' => 'event-adjust',
 394                         'ignore' => 'event-ignore', 'id' => 'event-id'];
 395
 396                 $fields['sign'] = ['signed_text', 'signature', 'signer'];
 397
 398                 return $fields;
 399         }
 400
 401         /**
 402          * @brief Returns SQL condition for the "select" functions
 403          *
 404          * @param boolean $thread_mode Called for the items (false) or for the threads (true)
 405          *
 406          * @return string SQL condition
 407          */
 408         private static function condition($thread_mode)
 409         {
 410                 if ($thread_mode) {
 411                         $master_table = "`thread`";
 412                 } else {
 413                         $master_table = "`item`";
 414                 }
 415                 return "$master_table.`visible` AND NOT $master_table.`deleted` AND NOT $master_table.`moderated` AND (`user-item`.`hidden` IS NULL OR NOT `user-item`.`hidden`) ";
 416         }
 417
 418         /**
 419          * @brief Returns all needed "JOIN" commands for the "select" functions
 420          *
 421          * @param integer $uid User ID
 422          * @param string $sql_commands The parts of the built SQL commands in the "select" functions
 423          * @param boolean $thread_mode Called for the items (false) or for the threads (true)
 424          *
 425          * @return string The SQL joins for the "select" functions
 426          */
 427         private static function constructJoins($uid, $sql_commands, $thread_mode)
 428         {
 429                 if ($thread_mode) {
 430                         $master_table = "`thread`";
 431                         $master_table_key = "`thread`.`iid`";
 432                         $joins = "STRAIGHT_JOIN `item` ON `item`.`id` = `thread`.`iid` ";
 433                 } else {
 434                         $master_table = "`item`";
 435                         $master_table_key = "`item`.`id`";
 436                         $joins = '';
 437                 }
 438
 439                 $joins .= sprintf("STRAIGHT_JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`
 440                         AND NOT `contact`.`blocked`
 441                         AND ((NOT `contact`.`readonly` AND NOT `contact`.`pending` AND (`contact`.`rel` IN (%s, %s)))
 442                         OR `contact`.`self` OR (`item`.`id` != `item`.`parent`) OR `contact`.`uid` = 0)
 443                         STRAIGHT_JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id` AND NOT `author`.`blocked`
 444                         STRAIGHT_JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id` AND NOT `owner`.`blocked`
 445                         LEFT JOIN `user-item` ON `user-item`.`iid` = $master_table_key AND `user-item`.`uid` = %d",
 446                         CONTACT_IS_SHARING, CONTACT_IS_FRIEND, intval($uid));
 447
 448                 if (strpos($sql_commands, "`group_member`.") !== false) {
 449                         $joins .= " STRAIGHT_JOIN `group_member` ON `group_member`.`contact-id` = $master_table.`contact-id`";
 450                 }
 451
 452                 if (strpos($sql_commands, "`user`.") !== false) {
 453                         $joins .= " STRAIGHT_JOIN `user` ON `user`.`uid` = $master_table.`uid`";
 454                 }
 455
 456                 if (strpos($sql_commands, "`event`.") !== false) {
 457                         $joins .= " LEFT JOIN `event` ON `event-id` = `event`.`id`";
 458                 }
 459
 460                 if (strpos($sql_commands, "`sign`.") !== false) {
 461                         $joins .= " LEFT JOIN `sign` ON `sign`.`iid` = `item`.`id`";
 462                 }
 463
 464                 if (strpos($sql_commands, "`item-content`.") !== false) {
 465                         $joins .= " LEFT JOIN `item-content` ON `item-content`.`id` = `item`.`icid`";
 466                 }
 467
 468                 if ((strpos($sql_commands, "`parent-item`.") !== false) || (strpos($sql_commands, "`parent-author`.") !== false)) {
 469                         $joins .= " STRAIGHT_JOIN `item` AS `parent-item` ON `parent-item`.`id` = `item`.`parent`";
 470                 }
 471
 472                 if (strpos($sql_commands, "`parent-item-author`.") !== false) {
 473                         $joins .= " STRAIGHT_JOIN `contact` AS `parent-item-author` ON `parent-item-author`.`id` = `parent-item`.`author-id`";
 474                 }
 475
 476                 return $joins;
 477         }
 478
 479         /**
 480          * @brief Add the field list for the "select" functions
 481          *
 482          * @param array $fields The field definition array
 483          * @param array $selected The array with the selected fields from the "select" functions
 484          *
 485          * @return string The field list
 486          */
 487         private static function constructSelectFields($fields, $selected)
 488         {
 489                 $selection = [];
 490                 foreach ($fields as $table => $table_fields) {
 491                         foreach ($table_fields as $field => $select) {
 492                                 if (empty($selected) || in_array($select, $selected)) {
 493                                         if (in_array($select, self::CONTENT_FIELDLIST)) {
 494                                                 $selection[] = "`item`.`".$select."` AS `item-" . $select . "`";
 495                                         }
 496                                         if (is_int($field)) {
 497                                                 $selection[] = "`" . $table . "`.`" . $select . "`";
 498                                         } else {
 499                                                 $selection[] = "`" . $table . "`.`" . $field . "` AS `" . $select . "`";
 500                                         }
 501                                 }
 502                         }
 503                 }
 504                 return implode(", ", $selection);
 505         }
 506
 507         /**
 508          * @brief add table definition to fields in an SQL query
 509          *
 510          * @param string $query SQL query
 511          * @param array $fields The field definition array
 512          *
 513          * @return string the changed SQL query
 514          */
 515         private static function addTablesToFields($query, $fields)
 516         {
 517                 foreach ($fields as $table => $table_fields) {
 518                         foreach ($table_fields as $alias => $field) {
 519                                 if (is_int($alias)) {
 520                                         $replace_field = $field;
 521                                 } else {
 522                                         $replace_field = $alias;
 523                                 }
 524
 525                                 $search = "/([^\.])`" . $field . "`/i";
 526                                 $replace = "$1`" . $table . "`.`" . $replace_field . "`";
 527                                 $query = preg_replace($search, $replace, $query);
 528                         }
 529                 }
 530                 return $query;
 531         }
 532
 533         /**
 534          * @brief Update existing item entries
 535          *
 536          * @param array $fields The fields that are to be changed
 537          * @param array $condition The condition for finding the item entries
 538          *
 539          * In the future we may have to change permissions as well.
 540          * Then we had to add the user id as third parameter.
 541          *
 542          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 543          *
 544          * @return integer|boolean number of affected rows - or "false" if there was an error
 545          */
 546         public static function update(array $fields, array $condition)
 547         {
 548                 if (empty($condition) || empty($fields)) {
 549                         return false;
 550                 }
 551
 552                 // To ensure the data integrity we do it in an transaction
 553                 dba::transaction();
 554
 555                 // We cannot simply expand the condition to check for origin entries
 556                 // The condition needn't to be a simple array but could be a complex condition.
 557                 // And we have to execute this query before the update to ensure to fetch the same data.
 558                 $items = dba::select('item', ['id', 'origin', 'uri', 'plink'], $condition);
 559
 560                 $content_fields = [];
 561                 foreach (self::CONTENT_FIELDLIST as $field) {
 562                         if (isset($fields[$field])) {
 563                                 $content_fields[$field] = $fields[$field];
 564                                 unset($fields[$field]);
 565                         }
 566                 }
 567
 568                 if (!empty($fields)) {
 569                         $success = dba::update('item', $fields, $condition);
 570
 571                         if (!$success) {
 572                                 dba::close($items);
 573                                 dba::rollback();
 574                                 return false;
 575                         }
 576                 }
 577
 578                 // When there is no content for the "old" item table, this will count the fetched items
 579                 $rows = dba::affected_rows();
 580
 581                 while ($item = dba::fetch($items)) {
 582                         if (!empty($item['plink'])) {
 583                                 $content_fields['plink'] =  $item['plink'];
 584                         }
 585                         self::updateContent($content_fields, ['uri' => $item['uri']]);
 586                         Term::insertFromTagFieldByItemId($item['id']);
 587                         Term::insertFromFileFieldByItemId($item['id']);
 588                         self::updateThread($item['id']);
 589
 590                         // We only need to notfiy others when it is an original entry from us.
 591                         // Only call the notifier when the item has some content relevant change.
 592                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 593                                 Worker::add(PRIORITY_HIGH, "Notifier", 'edit_post', $item['id']);
 594                         }
 595                 }
 596
 597                 dba::close($items);
 598                 dba::commit();
 599                 return $rows;
 600         }
 601
 602         /**
 603          * @brief Delete an item and notify others about it - if it was ours
 604          *
 605          * @param array $condition The condition for finding the item entries
 606          * @param integer $priority Priority for the notification
 607          */
 608         public static function delete($condition, $priority = PRIORITY_HIGH)
 609         {
 610                 $items = dba::select('item', ['id'], $condition);
 611                 while ($item = dba::fetch($items)) {
 612                         self::deleteById($item['id'], $priority);
 613                 }
 614                 dba::close($items);
 615         }
 616
 617         /**
 618          * @brief Delete an item for an user and notify others about it - if it was ours
 619          *
 620          * @param array $condition The condition for finding the item entries
 621          * @param integer $uid User who wants to delete this item
 622          */
 623         public static function deleteForUser($condition, $uid)
 624         {
 625                 if ($uid == 0) {
 626                         return;
 627                 }
 628
 629                 $items = dba::select('item', ['id', 'uid'], $condition);
 630                 while ($item = dba::fetch($items)) {
 631                         // "Deleting" global items just means hiding them
 632                         if ($item['uid'] == 0) {
 633                                 dba::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
 634                         } elseif ($item['uid'] == $uid) {
 635                                 self::deleteById($item['id'], PRIORITY_HIGH);
 636                         } else {
 637                                 logger('Wrong ownership. Not deleting item ' . $item['id']);
 638                         }
 639                 }
 640                 dba::close($items);
 641         }
 642
 643         /**
 644          * @brief Delete an item and notify others about it - if it was ours
 645          *
 646          * @param integer $item_id Item ID that should be delete
 647          * @param integer $priority Priority for the notification
 648          *
 649          * @return boolean success
 650          */
 651         private static function deleteById($item_id, $priority = PRIORITY_HIGH)
 652         {
 653                 // locate item to be deleted
 654                 $fields = ['id', 'uri', 'uid', 'parent', 'parent-uri', 'origin',
 655                         'deleted', 'file', 'resource-id', 'event-id', 'attach',
 656                         'verb', 'object-type', 'object', 'target', 'contact-id'];
 657                 $item = dba::selectFirst('item', $fields, ['id' => $item_id]);
 658                 if (!DBM::is_result($item)) {
 659                         logger('Item with ID ' . $item_id . " hasn't been found.", LOGGER_DEBUG);
 660                         return false;
 661                 }
 662
 663                 if ($item['deleted']) {
 664                         logger('Item with ID ' . $item_id . ' has already been deleted.', LOGGER_DEBUG);
 665                         return false;
 666                 }
 667
 668                 $parent = dba::selectFirst('item', ['origin'], ['id' => $item['parent']]);
 669                 if (!DBM::is_result($parent)) {
 670                         $parent = ['origin' => false];
 671                 }
 672
 673                 // clean up categories and tags so they don't end up as orphans
 674
 675                 $matches = false;
 676                 $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
 677                 if ($cnt) {
 678                         foreach ($matches as $mtch) {
 679                                 file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],true);
 680                         }
 681                 }
 682
 683                 $matches = false;
 684
 685                 $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
 686                 if ($cnt) {
 687                         foreach ($matches as $mtch) {
 688                                 file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],false);
 689                         }
 690                 }
 691
 692                 /*
 693                  * If item is a link to a photo resource, nuke all the associated photos
 694                  * (visitors will not have photo resources)
 695                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 696                  * generate a resource-id and therefore aren't intimately linked to the item.
 697                  */
 698                 if (strlen($item['resource-id'])) {
 699                         dba::delete('photo', ['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 700                 }
 701
 702                 // If item is a link to an event, delete the event.
 703                 if (intval($item['event-id'])) {
 704                         Event::delete($item['event-id']);
 705                 }
 706
 707                 // If item has attachments, drop them
 708                 foreach (explode(", ", $item['attach']) as $attach) {
 709                         preg_match("|attach/(\d+)|", $attach, $matches);
 710                         dba::delete('attach', ['id' => $matches[1], 'uid' => $item['uid']]);
 711                 }
 712
 713                 // Delete tags that had been attached to other items
 714                 self::deleteTagsFromItem($item);
 715
 716                 // Set the item to "deleted"
 717                 dba::update('item', ['deleted' => true, 'title' => '', 'body' => '',
 718                                         'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()],
 719                                 ['id' => $item['id']]);
 720
 721                 Term::insertFromTagFieldByItemId($item['id']);
 722                 Term::insertFromFileFieldByItemId($item['id']);
 723                 self::deleteThread($item['id'], $item['parent-uri']);
 724
 725                 if (!dba::exists('item', ["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
 726                         self::delete(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
 727                 }
 728
 729                 // If it's the parent of a comment thread, kill all the kids
 730                 if ($item['id'] == $item['parent']) {
 731                         self::delete(['parent' => $item['parent'], 'deleted' => false], $priority);
 732                 }
 733
 734                 // Is it our comment and/or our thread?
 735                 if ($item['origin'] || $parent['origin']) {
 736
 737                         // When we delete the original post we will delete all existing copies on the server as well
 738                         self::delete(['uri' => $item['uri'], 'deleted' => false], $priority);
 739
 740                         // send the notification upstream/downstream
 741                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", "drop", intval($item['id']));
 742                 } elseif ($item['uid'] != 0) {
 743
 744                         // When we delete just our local user copy of an item, we have to set a marker to hide it
 745                         $global_item = dba::selectFirst('item', ['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
 746                         if (DBM::is_result($global_item)) {
 747                                 dba::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
 748                         }
 749                 }
 750
 751                 logger('Item with ID ' . $item_id . " has been deleted.", LOGGER_DEBUG);
 752
 753                 return true;
 754         }
 755
 756         private static function deleteTagsFromItem($item)
 757         {
 758                 if (($item["verb"] != ACTIVITY_TAG) || ($item["object-type"] != ACTIVITY_OBJ_TAGTERM)) {
 759                         return;
 760                 }
 761
 762                 $xo = XML::parseString($item["object"], false);
 763                 $xt = XML::parseString($item["target"], false);
 764
 765                 if ($xt->type != ACTIVITY_OBJ_NOTE) {
 766                         return;
 767                 }
 768
 769                 $i = dba::selectFirst('item', ['id', 'contact-id', 'tag'], ['uri' => $xt->id, 'uid' => $item['uid']]);
 770                 if (!DBM::is_result($i)) {
 771                         return;
 772                 }
 773
 774                 // For tags, the owner cannot remove the tag on the author's copy of the post.
 775                 $owner_remove = ($item["contact-id"] == $i["contact-id"]);
 776                 $author_copy = $item["origin"];
 777
 778                 if (($owner_remove && $author_copy) || !$owner_remove) {
 779                         return;
 780                 }
 781
 782                 $tags = explode(',', $i["tag"]);
 783                 $newtags = [];
 784                 if (count($tags)) {
 785                         foreach ($tags as $tag) {
 786                                 if (trim($tag) !== trim($xo->body)) {
 787                                        $newtags[] = trim($tag);
 788                                 }
 789                         }
 790                 }
 791                 self::update(['tag' => implode(',', $newtags)], ['id' => $i["id"]]);
 792         }
 793
 794         private static function guid($item, $notify)
 795         {
 796                 $guid = notags(trim($item['guid']));
 797
 798                 if (!empty($guid)) {
 799                         return $guid;
 800                 }
 801
 802                 if ($notify) {
 803                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 804                         // We add the hash of our own host because our host is the original creator of the post.
 805                         $prefix_host = get_app()->get_hostname();
 806                 } else {
 807                         $prefix_host = '';
 808
 809                         // We are only storing the post so we create a GUID from the original hostname.
 810                         if (!empty($item['author-link'])) {
 811                                 $parsed = parse_url($item['author-link']);
 812                                 if (!empty($parsed['host'])) {
 813                                         $prefix_host = $parsed['host'];
 814                                 }
 815                         }
 816
 817                         if (empty($prefix_host) && !empty($item['plink'])) {
 818                                 $parsed = parse_url($item['plink']);
 819                                 if (!empty($parsed['host'])) {
 820                                         $prefix_host = $parsed['host'];
 821                                 }
 822                         }
 823
 824                         if (empty($prefix_host) && !empty($item['uri'])) {
 825                                 $parsed = parse_url($item['uri']);
 826                                 if (!empty($parsed['host'])) {
 827                                         $prefix_host = $parsed['host'];
 828                                 }
 829                         }
 830
 831                         // Is it in the format data@host.tld? - Used for mail contacts
 832                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 833                                 $mailparts = explode('@', $item['author-link']);
 834                                 $prefix_host = array_pop($mailparts);
 835                         }
 836                 }
 837
 838                 if (!empty($item['plink'])) {
 839                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 840                 } elseif (!empty($item['uri'])) {
 841                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 842                 } else {
 843                         $guid = get_guid(32, hash('crc32', $prefix_host));
 844                 }
 845
 846                 return $guid;
 847         }
 848
 849         private static function contactId($item)
 850         {
 851                 $contact_id = (int)$item["contact-id"];
 852
 853                 if (!empty($contact_id)) {
 854                         return $contact_id;
 855                 }
 856                 logger('Missing contact-id. Called by: '.System::callstack(), LOGGER_DEBUG);
 857                 /*
 858                  * First we are looking for a suitable contact that matches with the author of the post
 859                  * This is done only for comments
 860                  */
 861                 if ($item['parent-uri'] != $item['uri']) {
 862                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 863                 }
 864
 865                 // If not present then maybe the owner was found
 866                 if ($contact_id == 0) {
 867                         $contact_id = Contact::getIdForURL($item['owner-link'], $item['uid']);
 868                 }
 869
 870                 // Still missing? Then use the "self" contact of the current user
 871                 if ($contact_id == 0) {
 872                         $self = dba::selectFirst('contact', ['id'], ['self' => true, 'uid' => $item['uid']]);
 873                         if (DBM::is_result($self)) {
 874                                 $contact_id = $self["id"];
 875                         }
 876                 }
 877                 logger("Contact-id was missing for post ".$item['guid']." from user id ".$item['uid']." - now set to ".$contact_id, LOGGER_DEBUG);
 878
 879                 return $contact_id;
 880         }
 881
 882         public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
 883         {
 884                 $a = get_app();
 885
 886                 // If it is a posting where users should get notifications, then define it as wall posting
 887                 if ($notify) {
 888                         $item['wall'] = 1;
 889                         $item['type'] = 'wall';
 890                         $item['origin'] = 1;
 891                         $item['network'] = NETWORK_DFRN;
 892                         $item['protocol'] = PROTOCOL_DFRN;
 893
 894                         if (is_int($notify)) {
 895                                 $priority = $notify;
 896                         } else {
 897                                 $priority = PRIORITY_HIGH;
 898                         }
 899                 } else {
 900                         $item['network'] = trim(defaults($item, 'network', NETWORK_PHANTOM));
 901                 }
 902
 903                 $item['guid'] = self::guid($item, $notify);
 904                 $item['uri'] = notags(trim(defaults($item, 'uri', self::newURI($item['uid'], $item['guid']))));
 905
 906                 // Store conversation data
 907                 $item = Conversation::insert($item);
 908
 909                 /*
 910                  * If a Diaspora signature structure was passed in, pull it out of the
 911                  * item array and set it aside for later storage.
 912                  */
 913
 914                 $dsprsig = null;
 915                 if (x($item, 'dsprsig')) {
 916                         $encoded_signature = $item['dsprsig'];
 917                         $dsprsig = json_decode(base64_decode($item['dsprsig']));
 918                         unset($item['dsprsig']);
 919                 }
 920
 921                 if (!empty($item['diaspora_signed_text'])) {
 922                         $diaspora_signed_text = $item['diaspora_signed_text'];
 923                         unset($item['diaspora_signed_text']);
 924                 } else {
 925                         $diaspora_signed_text = '';
 926                 }
 927
 928                 // Converting the plink
 929                 /// @TODO Check if this is really still needed
 930                 if ($item['network'] == NETWORK_OSTATUS) {
 931                         if (isset($item['plink'])) {
 932                                 $item['plink'] = OStatus::convertHref($item['plink']);
 933                         } elseif (isset($item['uri'])) {
 934                                 $item['plink'] = OStatus::convertHref($item['uri']);
 935                         }
 936                 }
 937
 938                 if (!empty($item['thr-parent'])) {
 939                         $item['parent-uri'] = $item['thr-parent'];
 940                 }
 941
 942                 if (x($item, 'gravity')) {
 943                         $item['gravity'] = intval($item['gravity']);
 944                 } elseif ($item['parent-uri'] === $item['uri']) {
 945                         $item['gravity'] = 0;
 946                 } elseif (activity_match($item['verb'],ACTIVITY_POST)) {
 947                         $item['gravity'] = 6;
 948                 } else {
 949                         $item['gravity'] = 6;   // extensible catchall
 950                 }
 951
 952                 $item['type'] = defaults($item, 'type', 'remote');
 953
 954                 $uid = intval($item['uid']);
 955
 956                 // check for create date and expire time
 957                 $expire_interval = Config::get('system', 'dbclean-expire-days', 0);
 958
 959                 $user = dba::selectFirst('user', ['expire'], ['uid' => $uid]);
 960                 if (DBM::is_result($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 961                         $expire_interval = $user['expire'];
 962                 }
 963
 964                 if (($expire_interval > 0) && !empty($item['created'])) {
 965                         $expire_date = time() - ($expire_interval * 86400);
 966                         $created_date = strtotime($item['created']);
 967                         if ($created_date < $expire_date) {
 968                                 logger('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), LOGGER_DEBUG);
 969                                 return 0;
 970                         }
 971                 }
 972
 973                 /*
 974                  * Do we already have this item?
 975                  * We have to check several networks since Friendica posts could be repeated
 976                  * via OStatus (maybe Diasporsa as well)
 977                  */
 978                 if (in_array($item['network'], [NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS, ""])) {
 979                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?)",
 980                                 trim($item['uri']), $item['uid'],
 981                                 NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS];
 982                         $existing = dba::selectFirst('item', ['id', 'network'], $condition);
 983                         if (DBM::is_result($existing)) {
 984                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 985                                 if ($uid != 0) {
 986                                         logger("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
 987                                 }
 988
 989                                 return $existing["id"];
 990                         }
 991                 }
 992
 993                 self::addLanguageInPostopts($item);
 994
 995                 $item['wall']          = intval(defaults($item, 'wall', 0));
 996                 $item['extid']         = trim(defaults($item, 'extid', ''));
 997                 $item['author-name']   = trim(defaults($item, 'author-name', ''));
 998                 $item['author-link']   = trim(defaults($item, 'author-link', ''));
 999                 $item['author-avatar'] = trim(defaults($item, 'author-avatar', ''));
1000                 $item['owner-name']    = trim(defaults($item, 'owner-name', ''));
1001                 $item['owner-link']    = trim(defaults($item, 'owner-link', ''));
1002                 $item['owner-avatar']  = trim(defaults($item, 'owner-avatar', ''));
1003                 $item['received']      = ((x($item, 'received') !== false) ? DateTimeFormat::utc($item['received']) : DateTimeFormat::utcNow());
1004                 $item['created']       = ((x($item, 'created') !== false) ? DateTimeFormat::utc($item['created']) : $item['received']);
1005                 $item['edited']        = ((x($item, 'edited') !== false) ? DateTimeFormat::utc($item['edited']) : $item['created']);
1006                 $item['changed']       = ((x($item, 'changed') !== false) ? DateTimeFormat::utc($item['changed']) : $item['created']);
1007                 $item['commented']     = ((x($item, 'commented') !== false) ? DateTimeFormat::utc($item['commented']) : $item['created']);
1008                 $item['title']         = trim(defaults($item, 'title', ''));
1009                 $item['location']      = trim(defaults($item, 'location', ''));
1010                 $item['coord']         = trim(defaults($item, 'coord', ''));
1011                 $item['visible']       = ((x($item, 'visible') !== false) ? intval($item['visible'])         : 1);
1012                 $item['deleted']       = 0;
1013                 $item['parent-uri']    = trim(defaults($item, 'parent-uri', $item['uri']));
1014                 $item['verb']          = trim(defaults($item, 'verb', ''));
1015                 $item['object-type']   = trim(defaults($item, 'object-type', ''));
1016                 $item['object']        = trim(defaults($item, 'object', ''));
1017                 $item['target-type']   = trim(defaults($item, 'target-type', ''));
1018                 $item['target']        = trim(defaults($item, 'target', ''));
1019                 $item['plink']         = trim(defaults($item, 'plink', ''));
1020                 $item['allow_cid']     = trim(defaults($item, 'allow_cid', ''));
1021                 $item['allow_gid']     = trim(defaults($item, 'allow_gid', ''));
1022                 $item['deny_cid']      = trim(defaults($item, 'deny_cid', ''));
1023                 $item['deny_gid']      = trim(defaults($item, 'deny_gid', ''));
1024                 $item['private']       = intval(defaults($item, 'private', 0));
1025                 $item['bookmark']      = intval(defaults($item, 'bookmark', 0));
1026                 $item['body']          = trim(defaults($item, 'body', ''));
1027                 $item['tag']           = trim(defaults($item, 'tag', ''));
1028                 $item['attach']        = trim(defaults($item, 'attach', ''));
1029                 $item['app']           = trim(defaults($item, 'app', ''));
1030                 $item['origin']        = intval(defaults($item, 'origin', 0));
1031                 $item['postopts']      = trim(defaults($item, 'postopts', ''));
1032                 $item['resource-id']   = trim(defaults($item, 'resource-id', ''));
1033                 $item['event-id']      = intval(defaults($item, 'event-id', 0));
1034                 $item['inform']        = trim(defaults($item, 'inform', ''));
1035                 $item['file']          = trim(defaults($item, 'file', ''));
1036
1037                 // When there is no content then we don't post it
1038                 if ($item['body'].$item['title'] == '') {
1039                         logger('No body, no title.');
1040                         return 0;
1041                 }
1042
1043                 // Items cannot be stored before they happen ...
1044                 if ($item['created'] > DateTimeFormat::utcNow()) {
1045                         $item['created'] = DateTimeFormat::utcNow();
1046                 }
1047
1048                 // We haven't invented time travel by now.
1049                 if ($item['edited'] > DateTimeFormat::utcNow()) {
1050                         $item['edited'] = DateTimeFormat::utcNow();
1051                 }
1052
1053                 if (($item['author-link'] == "") && ($item['owner-link'] == "")) {
1054                         logger("Both author-link and owner-link are empty. Called by: " . System::callstack(), LOGGER_DEBUG);
1055                 }
1056
1057                 $item['plink'] = defaults($item, 'plink', System::baseUrl() . '/display/' . urlencode($item['guid']));
1058
1059                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
1060                 $item["contact-id"] = self::contactId($item);
1061
1062                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
1063                         'photo' => $item['author-avatar'], 'network' => $item['network']];
1064
1065                 $item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
1066
1067                 if (Contact::isBlocked($item["author-id"])) {
1068                         logger('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
1069                         return 0;
1070                 }
1071
1072                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
1073                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
1074
1075                 $item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
1076
1077                 if (Contact::isBlocked($item["owner-id"])) {
1078                         logger('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
1079                         return 0;
1080                 }
1081
1082                 // These fields aren't stored anymore in the item table, they are fetched upon request
1083                 unset($item['author-link']);
1084                 unset($item['author-name']);
1085                 unset($item['author-avatar']);
1086
1087                 unset($item['owner-link']);
1088                 unset($item['owner-name']);
1089                 unset($item['owner-avatar']);
1090
1091                 if ($item['network'] == NETWORK_PHANTOM) {
1092                         logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
1093
1094                         $contact = Contact::getDetailsByURL($item['author-link'], $item['uid']);
1095                         if (!empty($contact['network'])) {
1096                                 $item['network'] = $contact["network"];
1097                         } else {
1098                                 $item['network'] = NETWORK_DFRN;
1099                         }
1100                         logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
1101                 }
1102
1103                 // Checking if there is already an item with the same guid
1104                 logger('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], LOGGER_DEBUG);
1105                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
1106                 if (dba::exists('item', $condition)) {
1107                         logger('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], LOGGER_DEBUG);
1108                         return 0;
1109                 }
1110
1111                 // Check for hashtags in the body and repair or add hashtag links
1112                 self::setHashtags($item);
1113
1114                 $item['thr-parent'] = $item['parent-uri'];
1115
1116                 $notify_type = '';
1117                 $allow_cid = '';
1118                 $allow_gid = '';
1119                 $deny_cid  = '';
1120                 $deny_gid  = '';
1121
1122                 if ($item['parent-uri'] === $item['uri']) {
1123                         $parent_id = 0;
1124                         $parent_deleted = 0;
1125                         $allow_cid = $item['allow_cid'];
1126                         $allow_gid = $item['allow_gid'];
1127                         $deny_cid  = $item['deny_cid'];
1128                         $deny_gid  = $item['deny_gid'];
1129                         $notify_type = 'wall-new';
1130                 } else {
1131                         // find the parent and snarf the item id and ACLs
1132                         // and anything else we need to inherit
1133
1134                         $fields = ['uri', 'parent-uri', 'id', 'deleted',
1135                                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
1136                                 'wall', 'private', 'forum_mode', 'origin'];
1137                         $condition = ['uri' => $item['parent-uri'], 'uid' => $item['uid']];
1138                         $params = ['order' => ['id' => false]];
1139                         $parent = dba::selectFirst('item', $fields, $condition, $params);
1140
1141                         if (DBM::is_result($parent)) {
1142                                 // is the new message multi-level threaded?
1143                                 // even though we don't support it now, preserve the info
1144                                 // and re-attach to the conversation parent.
1145
1146                                 if ($parent['uri'] != $parent['parent-uri']) {
1147                                         $item['parent-uri'] = $parent['parent-uri'];
1148
1149                                         $condition = ['uri' => $item['parent-uri'],
1150                                                 'parent-uri' => $item['parent-uri'],
1151                                                 'uid' => $item['uid']];
1152                                         $params = ['order' => ['id' => false]];
1153                                         $toplevel_parent = dba::selectFirst('item', $fields, $condition, $params);
1154
1155                                         if (DBM::is_result($toplevel_parent)) {
1156                                                 $parent = $toplevel_parent;
1157                                         }
1158                                 }
1159
1160                                 $parent_id      = $parent['id'];
1161                                 $parent_deleted = $parent['deleted'];
1162                                 $allow_cid      = $parent['allow_cid'];
1163                                 $allow_gid      = $parent['allow_gid'];
1164                                 $deny_cid       = $parent['deny_cid'];
1165                                 $deny_gid       = $parent['deny_gid'];
1166                                 $item['wall']    = $parent['wall'];
1167                                 $notify_type    = 'comment-new';
1168
1169                                 /*
1170                                  * If the parent is private, force privacy for the entire conversation
1171                                  * This differs from the above settings as it subtly allows comments from
1172                                  * email correspondents to be private even if the overall thread is not.
1173                                  */
1174                                 if ($parent['private']) {
1175                                         $item['private'] = $parent['private'];
1176                                 }
1177
1178                                 /*
1179                                  * Edge case. We host a public forum that was originally posted to privately.
1180                                  * The original author commented, but as this is a comment, the permissions
1181                                  * weren't fixed up so it will still show the comment as private unless we fix it here.
1182                                  */
1183                                 if ((intval($parent['forum_mode']) == 1) && $parent['private']) {
1184                                         $item['private'] = 0;
1185                                 }
1186
1187                                 // If its a post from myself then tag the thread as "mention"
1188                                 logger("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], LOGGER_DEBUG);
1189                                 $user = dba::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
1190                                 if (DBM::is_result($user)) {
1191                                         $self = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
1192                                         $self_id = Contact::getIdForURL($self, 0, true);
1193                                         logger("'myself' is ".$self_id." for parent ".$parent_id." checking against ".$item['author-id']." and ".$item['owner-id'], LOGGER_DEBUG);
1194                                         if (($item['author-id'] == $self_id) || ($item['owner-id'] == $self_id)) {
1195                                                 dba::update('thread', ['mention' => true], ['iid' => $parent_id]);
1196                                                 logger("tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
1197                                         }
1198                                 }
1199                         } else {
1200                                 /*
1201                                  * Allow one to see reply tweets from status.net even when
1202                                  * we don't have or can't see the original post.
1203                                  */
1204                                 if ($force_parent) {
1205                                         logger('$force_parent=true, reply converted to top-level post.');
1206                                         $parent_id = 0;
1207                                         $item['parent-uri'] = $item['uri'];
1208                                         $item['gravity'] = 0;
1209                                 } else {
1210                                         logger('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
1211                                         return 0;
1212                                 }
1213
1214                                 $parent_deleted = 0;
1215                         }
1216                 }
1217
1218                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
1219                         $item['uri'], $item['network'], NETWORK_DFRN, $item['uid']];
1220                 if (dba::exists('item', $condition)) {
1221                         logger('duplicated item with the same uri found. '.print_r($item,true));
1222                         return 0;
1223                 }
1224
1225                 // On Friendica and Diaspora the GUID is unique
1226                 if (in_array($item['network'], [NETWORK_DFRN, NETWORK_DIASPORA])) {
1227                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
1228                         if (dba::exists('item', $condition)) {
1229                                 logger('duplicated item with the same guid found. '.print_r($item,true));
1230                                 return 0;
1231                         }
1232                 } else {
1233                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
1234                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
1235                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
1236                         if (dba::exists('item', $condition)) {
1237                                 logger('duplicated item with the same body found. '.print_r($item,true));
1238                                 return 0;
1239                         }
1240                 }
1241
1242                 // Is this item available in the global items (with uid=0)?
1243                 if ($item["uid"] == 0) {
1244                         $item["global"] = true;
1245
1246                         // Set the global flag on all items if this was a global item entry
1247                         dba::update('item', ['global' => true], ['uri' => $item["uri"]]);
1248                 } else {
1249                         $item["global"] = dba::exists('item', ['uid' => 0, 'uri' => $item["uri"]]);
1250                 }
1251
1252                 // ACL settings
1253                 if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
1254                         $private = 1;
1255                 } else {
1256                         $private = $item['private'];
1257                 }
1258
1259                 $item["allow_cid"] = $allow_cid;
1260                 $item["allow_gid"] = $allow_gid;
1261                 $item["deny_cid"] = $deny_cid;
1262                 $item["deny_gid"] = $deny_gid;
1263                 $item["private"] = $private;
1264                 $item["deleted"] = $parent_deleted;
1265
1266                 // Fill the cache field
1267                 put_item_in_cache($item);
1268
1269                 if ($notify) {
1270                         Addon::callHooks('post_local', $item);
1271                 } else {
1272                         Addon::callHooks('post_remote', $item);
1273                 }
1274
1275                 // This array field is used to trigger some automatic reactions
1276                 // It is mainly used in the "post_local" hook.
1277                 unset($item['api_source']);
1278
1279                 if (x($item, 'cancel')) {
1280                         logger('post cancelled by addon.');
1281                         return 0;
1282                 }
1283
1284                 /*
1285                  * Check for already added items.
1286                  * There is a timing issue here that sometimes creates double postings.
1287                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
1288                  */
1289                 if ($item["uid"] == 0) {
1290                         if (dba::exists('item', ['uri' => trim($item['uri']), 'uid' => 0])) {
1291                                 logger('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], LOGGER_DEBUG);
1292                                 return 0;
1293                         }
1294                 }
1295
1296                 logger('' . print_r($item,true), LOGGER_DATA);
1297
1298                 dba::transaction();
1299                 self::insertContent($item);
1300                 $ret = dba::insert('item', $item);
1301
1302                 // When the item was successfully stored we fetch the ID of the item.
1303                 if (DBM::is_result($ret)) {
1304                         $current_post = dba::lastInsertId();
1305                 } else {
1306                         // This can happen - for example - if there are locking timeouts.
1307                         dba::rollback();
1308
1309                         // Store the data into a spool file so that we can try again later.
1310
1311                         // At first we restore the Diaspora signature that we removed above.
1312                         if (isset($encoded_signature)) {
1313                                 $item['dsprsig'] = $encoded_signature;
1314                         }
1315
1316                         // Now we store the data in the spool directory
1317                         // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
1318                         $file = 'item-'.round(microtime(true) * 10000).'-'.mt_rand().'.msg';
1319
1320                         $spoolpath = get_spoolpath();
1321                         if ($spoolpath != "") {
1322                                 $spool = $spoolpath.'/'.$file;
1323                                 file_put_contents($spool, json_encode($item));
1324                                 logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
1325                         }
1326                         return 0;
1327                 }
1328
1329                 if ($current_post == 0) {
1330                         // This is one of these error messages that never should occur.
1331                         logger("couldn't find created item - we better quit now.");
1332                         dba::rollback();
1333                         return 0;
1334                 }
1335
1336                 // How much entries have we created?
1337                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
1338                 $entries = dba::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
1339
1340                 if ($entries > 1) {
1341                         // There are duplicates. We delete our just created entry.
1342                         logger('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
1343
1344                         // Yes, we could do a rollback here - but we are having many users with MyISAM.
1345                         dba::delete('item', ['id' => $current_post]);
1346                         dba::commit();
1347                         return 0;
1348                 } elseif ($entries == 0) {
1349                         // This really should never happen since we quit earlier if there were problems.
1350                         logger("Something is terribly wrong. We haven't found our created entry.");
1351                         dba::rollback();
1352                         return 0;
1353                 }
1354
1355                 logger('created item '.$current_post);
1356                 self::updateContact($item);
1357
1358                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
1359                         $parent_id = $current_post;
1360                 }
1361
1362                 // Set parent id
1363                 dba::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1364
1365                 $item['id'] = $current_post;
1366                 $item['parent'] = $parent_id;
1367
1368                 // update the commented timestamp on the parent
1369                 // Only update "commented" if it is really a comment
1370                 if (($item['verb'] == ACTIVITY_POST) || !Config::get("system", "like_no_comment")) {
1371                         dba::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1372                 } else {
1373                         dba::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1374                 }
1375
1376                 if ($dsprsig) {
1377                         /*
1378                          * Friendica servers lower than 3.4.3-2 had double encoded the signature ...
1379                          * We can check for this condition when we decode and encode the stuff again.
1380                          */
1381                         if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
1382                                 $dsprsig->signature = base64_decode($dsprsig->signature);
1383                                 logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
1384                         }
1385
1386                         dba::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
1387                                                 'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
1388                 }
1389
1390                 if (!empty($diaspora_signed_text)) {
1391                         // Formerly we stored the signed text, the signature and the author in different fields.
1392                         // We now store the raw data so that we are more flexible.
1393                         dba::insert('sign', ['iid' => $current_post, 'signed_text' => $diaspora_signed_text]);
1394                 }
1395
1396                 $deleted = self::tagDeliver($item['uid'], $current_post);
1397
1398                 /*
1399                  * current post can be deleted if is for a community page and no mention are
1400                  * in it.
1401                  */
1402                 if (!$deleted && !$dontcache) {
1403                         $posted_item = dba::selectFirst('item', [], ['id' => $current_post]);
1404                         if (DBM::is_result($posted_item)) {
1405                                 if ($notify) {
1406                                         Addon::callHooks('post_local_end', $posted_item);
1407                                 } else {
1408                                         Addon::callHooks('post_remote_end', $posted_item);
1409                                 }
1410                         } else {
1411                                 logger('new item not found in DB, id ' . $current_post);
1412                         }
1413                 }
1414
1415                 if ($item['parent-uri'] === $item['uri']) {
1416                         self::addThread($current_post);
1417                 } else {
1418                         self::updateThread($parent_id);
1419                 }
1420
1421                 dba::commit();
1422
1423                 /*
1424                  * Due to deadlock issues with the "term" table we are doing these steps after the commit.
1425                  * This is not perfect - but a workable solution until we found the reason for the problem.
1426                  */
1427                 Term::insertFromTagFieldByItemId($current_post);
1428                 Term::insertFromFileFieldByItemId($current_post);
1429
1430                 if ($item['parent-uri'] === $item['uri']) {
1431                         self::addShadow($current_post);
1432                 } else {
1433                         self::addShadowPost($current_post);
1434                 }
1435
1436                 check_user_notification($current_post);
1437
1438                 if ($notify) {
1439                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", $notify_type, $current_post);
1440                 } elseif (!empty($parent) && $parent['origin']) {
1441                         Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "Notifier", "comment-import", $current_post);
1442                 }
1443
1444                 return $current_post;
1445         }
1446
1447         /**
1448          * @brief Insert a new item content entry
1449          *
1450          * @param array $item The item fields that are to be inserted
1451          */
1452         private static function insertContent(&$item)
1453         {
1454                 $fields = ['uri' => $item['uri'], 'plink' => $item['plink'],
1455                         'uri-plink-hash' => hash('sha1', $item['plink']).hash('sha1', $item['uri'])];
1456
1457                 unset($item['plink']);
1458
1459                 foreach (self::CONTENT_FIELDLIST as $field) {
1460                         if (isset($item[$field])) {
1461                                 $fields[$field] = $item[$field];
1462                                 unset($item[$field]);
1463                         }
1464                 }
1465
1466                 // Do we already have this content?
1467                 if (!dba::exists('item-content', ['uri' => $item['uri']])) {
1468                         dba::insert('item-content', $fields, true);
1469                 }
1470
1471                 $item_content = dba::selectFirst('item-content', ['id'], ['uri' => $item['uri']]);
1472                 if (DBM::is_result($item_content)) {
1473                         $item['icid'] = $item_content['id'];
1474                         logger('Insert content for URI '.$item['uri'].' ('.$item['icid'].')');
1475                 }
1476         }
1477
1478         /**
1479          * @brief Update existing item content entries
1480          *
1481          * @param array $item The item fields that are to be changed
1482          * @param array $condition The condition for finding the item content entries
1483          */
1484         private static function updateContent($item, $condition)
1485         {
1486                 // We have to select only the fields from the "item-content" table
1487                 $fields = [];
1488                 foreach (self::CONTENT_FIELDLIST as $field) {
1489                         if (isset($item[$field])) {
1490                                 $fields[$field] = $item[$field];
1491                         }
1492                 }
1493
1494                 if (empty($fields)) {
1495                         return;
1496                 }
1497
1498                 if (!empty($item['plink'])) {
1499                         $fields['plink'] = $item['plink'];
1500                         $fields['uri-plink-hash'] = hash('sha1', $item['plink']).hash('sha1', $condition['uri']);
1501                 }
1502
1503                 logger('Update content for URI '.$condition['uri']);
1504
1505                 dba::update('item-content', $fields, $condition, true);
1506         }
1507
1508         /**
1509          * @brief Distributes public items to the receivers
1510          *
1511          * @param integer $itemid      Item ID that should be added
1512          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1513          */
1514         public static function distribute($itemid, $signed_text = '')
1515         {
1516                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
1517                 $parent = dba::selectFirst('item', ['owner-id'], $condition);
1518                 if (!DBM::is_result($parent)) {
1519                         return;
1520                 }
1521
1522                 // Only distribute public items from native networks
1523                 $condition = ['id' => $itemid, 'uid' => 0,
1524                         'network' => [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""],
1525                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
1526                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1527                 if (!DBM::is_result($item)) {
1528                         return;
1529                 }
1530
1531                 $fields = self::CONTENT_FIELDLIST;
1532                 $fields[] = 'author-link';
1533                 $fields[] = 'owner-link';
1534
1535                 $content = self::selectFirst($fields, ['id' => $itemid]);
1536                 if (DBM::is_result($content)) {
1537                         $item = array_merge($item, $content);
1538                 }
1539
1540                 unset($item['id']);
1541                 unset($item['parent']);
1542                 unset($item['mention']);
1543                 unset($item['wall']);
1544                 unset($item['origin']);
1545                 unset($item['starred']);
1546
1547                 $users = [];
1548
1549                 $condition = ["`nurl` IN (SELECT `nurl` FROM `contact` WHERE `id` = ?) AND `uid` != 0 AND NOT `blocked` AND `rel` IN (?, ?)",
1550                         $parent['owner-id'], CONTACT_IS_SHARING,  CONTACT_IS_FRIEND];
1551                 $contacts = dba::select('contact', ['uid'], $condition);
1552                 while ($contact = dba::fetch($contacts)) {
1553                         $users[$contact['uid']] = $contact['uid'];
1554                 }
1555
1556                 $origin_uid = 0;
1557
1558                 if ($item['uri'] != $item['parent-uri']) {
1559                         $parents = dba::select('item', ['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
1560                         while ($parent = dba::fetch($parents)) {
1561                                 $users[$parent['uid']] = $parent['uid'];
1562                                 if ($parent['origin'] && !$item['origin']) {
1563                                         $origin_uid = $parent['uid'];
1564                                 }
1565                         }
1566                 }
1567
1568                 foreach ($users as $uid) {
1569                         if ($origin_uid == $uid) {
1570                                 $item['diaspora_signed_text'] = $signed_text;
1571                         }
1572                         self::storeForUser($itemid, $item, $uid);
1573                 }
1574         }
1575
1576         /**
1577          * @brief Store public items for the receivers
1578          *
1579          * @param integer $itemid Item ID that should be added
1580          * @param array   $item   The item entry that will be stored
1581          * @param integer $uid    The user that will receive the item entry
1582          */
1583         private static function storeForUser($itemid, $item, $uid)
1584         {
1585                 $item['uid'] = $uid;
1586                 $item['origin'] = 0;
1587                 $item['wall'] = 0;
1588                 if ($item['uri'] == $item['parent-uri']) {
1589                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
1590                 } else {
1591                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
1592                 }
1593
1594                 if (empty($item['contact-id'])) {
1595                         $self = dba::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1596                         if (!DBM::is_result($self)) {
1597                                 return;
1598                         }
1599                         $item['contact-id'] = $self['id'];
1600                 }
1601
1602                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1603                         $item['type'] = 'remote-comment';
1604                 } elseif ($item['type'] == 'wall') {
1605                         $item['type'] = 'remote';
1606                 }
1607
1608                 /// @todo Handling of "event-id"
1609
1610                 $notify = false;
1611                 if ($item['uri'] == $item['parent-uri']) {
1612                         $contact = dba::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1613                         if (DBM::is_result($contact)) {
1614                                 $notify = self::isRemoteSelf($contact, $item);
1615                         }
1616                 }
1617
1618                 $distributed = self::insert($item, false, $notify, true);
1619
1620                 if (!$distributed) {
1621                         logger("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", LOGGER_DEBUG);
1622                 } else {
1623                         logger("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, LOGGER_DEBUG);
1624                 }
1625         }
1626
1627         /**
1628          * @brief Add a shadow entry for a given item id that is a thread starter
1629          *
1630          * We store every public item entry additionally with the user id "0".
1631          * This is used for the community page and for the search.
1632          * It is planned that in the future we will store public item entries only once.
1633          *
1634          * @param integer $itemid Item ID that should be added
1635          */
1636         public static function addShadow($itemid)
1637         {
1638                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network'];
1639                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1640                 $item = dba::selectFirst('item', $fields, $condition);
1641
1642                 if (!DBM::is_result($item)) {
1643                         return;
1644                 }
1645
1646                 // is it already a copy?
1647                 if (($itemid == 0) || ($item['uid'] == 0)) {
1648                         return;
1649                 }
1650
1651                 // Is it a visible public post?
1652                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || $item["private"]) {
1653                         return;
1654                 }
1655
1656                 // is it an entry from a connector? Only add an entry for natively connected networks
1657                 if (!in_array($item["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""])) {
1658                         return;
1659                 }
1660
1661                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1662
1663                 $fields = self::CONTENT_FIELDLIST;
1664                 $fields[] = 'author-link';
1665                 $fields[] = 'owner-link';
1666
1667                 $content = self::selectFirst($fields, ['id' => $itemid]);
1668                 if (DBM::is_result($content)) {
1669                         $item = array_merge($item, $content);
1670                 }
1671
1672                 if (DBM::is_result($item) && ($item["allow_cid"] == '') && ($item["allow_gid"] == '') &&
1673                         ($item["deny_cid"] == '') && ($item["deny_gid"] == '')) {
1674
1675                         if (!dba::exists('item', ['uri' => $item['uri'], 'uid' => 0])) {
1676                                 // Preparing public shadow (removing user specific data)
1677                                 $item['uid'] = 0;
1678                                 unset($item['id']);
1679                                 unset($item['parent']);
1680                                 unset($item['wall']);
1681                                 unset($item['mention']);
1682                                 unset($item['origin']);
1683                                 unset($item['starred']);
1684                                 if ($item['uri'] == $item['parent-uri']) {
1685                                         $item['contact-id'] = $item['owner-id'];
1686                                 } else {
1687                                         $item['contact-id'] = $item['author-id'];
1688                                 }
1689
1690                                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1691                                         $item['type'] = 'remote-comment';
1692                                 } elseif ($item['type'] == 'wall') {
1693                                         $item['type'] = 'remote';
1694                                 }
1695
1696                                 $public_shadow = self::insert($item, false, false, true);
1697
1698                                 logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
1699                         }
1700                 }
1701         }
1702
1703         /**
1704          * @brief Add a shadow entry for a given item id that is a comment
1705          *
1706          * This function does the same like the function above - but for comments
1707          *
1708          * @param integer $itemid Item ID that should be added
1709          */
1710         public static function addShadowPost($itemid)
1711         {
1712                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1713                 if (!DBM::is_result($item)) {
1714                         return;
1715                 }
1716
1717                 // Is it a toplevel post?
1718                 if ($item['id'] == $item['parent']) {
1719                         self::addShadow($itemid);
1720                         return;
1721                 }
1722
1723                 // Is this a shadow entry?
1724                 if ($item['uid'] == 0) {
1725                         return;
1726                 }
1727
1728                 // Is there a shadow parent?
1729                 if (!dba::exists('item', ['uri' => $item['parent-uri'], 'uid' => 0])) {
1730                         return;
1731                 }
1732
1733                 // Is there already a shadow entry?
1734                 if (dba::exists('item', ['uri' => $item['uri'], 'uid' => 0])) {
1735                         return;
1736                 }
1737
1738                 // Save "origin" and "parent" state
1739                 $origin = $item['origin'];
1740                 $parent = $item['parent'];
1741
1742                 // Preparing public shadow (removing user specific data)
1743                 $item['uid'] = 0;
1744                 unset($item['id']);
1745                 unset($item['parent']);
1746                 unset($item['wall']);
1747                 unset($item['mention']);
1748                 unset($item['origin']);
1749                 unset($item['starred']);
1750                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1751
1752                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1753                         $item['type'] = 'remote-comment';
1754                 } elseif ($item['type'] == 'wall') {
1755                         $item['type'] = 'remote';
1756                 }
1757
1758                 $public_shadow = self::insert($item, false, false, true);
1759
1760                 logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);
1761
1762                 // If this was a comment to a Diaspora post we don't get our comment back.
1763                 // This means that we have to distribute the comment by ourselves.
1764                 if ($origin && dba::exists('item', ['id' => $parent, 'network' => NETWORK_DIASPORA])) {
1765                         self::distribute($public_shadow);
1766                 }
1767         }
1768
1769          /**
1770          * Adds a "lang" specification in a "postopts" element of given $arr,
1771          * if possible and not already present.
1772          * Expects "body" element to exist in $arr.
1773          */
1774         private static function addLanguageInPostopts(&$item)
1775         {
1776                 $postopts = "";
1777
1778                 if (!empty($item['postopts'])) {
1779                         if (strstr($item['postopts'], 'lang=')) {
1780                                 // do not override
1781                                 return;
1782                         }
1783                         $postopts = $item['postopts'];
1784                 }
1785
1786                 $naked_body = Text\BBCode::toPlaintext($item['body'], false);
1787
1788                 $languages = (new Text_LanguageDetect())->detect($naked_body, 3);
1789
1790                 if (sizeof($languages) > 0) {
1791                         if ($postopts != '') {
1792                                 $postopts .= '&'; // arbitrary separator, to be reviewed
1793                         }
1794
1795                         $postopts .= 'lang=';
1796                         $sep = "";
1797
1798                         foreach ($languages as $language => $score) {
1799                                 $postopts .= $sep . $language . ";" . $score;
1800                                 $sep = ':';
1801                         }
1802                         $item['postopts'] = $postopts;
1803                 }
1804         }
1805
1806         /**
1807          * @brief Creates an unique guid out of a given uri
1808          *
1809          * @param string $uri uri of an item entry
1810          * @param string $host hostname for the GUID prefix
1811          * @return string unique guid
1812          */
1813         public static function guidFromUri($uri, $host)
1814         {
1815                 // Our regular guid routine is using this kind of prefix as well
1816                 // We have to avoid that different routines could accidentally create the same value
1817                 $parsed = parse_url($uri);
1818
1819                 // We use a hash of the hostname as prefix for the guid
1820                 $guid_prefix = hash("crc32", $host);
1821
1822                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1823                 unset($parsed["scheme"]);
1824
1825                 // Glue it together to be able to make a hash from it
1826                 $host_id = implode("/", $parsed);
1827
1828                 // We could use any hash algorithm since it isn't a security issue
1829                 $host_hash = hash("ripemd128", $host_id);
1830
1831                 return $guid_prefix.$host_hash;
1832         }
1833
1834         /**
1835          * generate an unique URI
1836          *
1837          * @param integer $uid User id
1838          * @param string $guid An existing GUID (Otherwise it will be generated)
1839          *
1840          * @return string
1841          */
1842         public static function newURI($uid, $guid = "")
1843         {
1844                 if ($guid == "") {
1845                         $guid = get_guid(32);
1846                 }
1847
1848                 $hostname = self::getApp()->get_hostname();
1849
1850                 $user = dba::selectFirst('user', ['nickname'], ['uid' => $uid]);
1851
1852                 $uri = "urn:X-dfrn:" . $hostname . ':' . $user['nickname'] . ':' . $guid;
1853
1854                 return $uri;
1855         }
1856
1857         /**
1858          * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
1859          *
1860          * This can be used to filter for inactive contacts.
1861          * Only do this for public postings to avoid privacy problems, since poco data is public.
1862          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1863          *
1864          * @param array $arr Contains the just posted item record
1865          */
1866         private static function updateContact($arr)
1867         {
1868                 // Unarchive the author
1869                 $contact = dba::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1870                 if (DBM::is_result($contact)) {
1871                         Contact::unmarkForArchival($contact);
1872                 }
1873
1874                 // Unarchive the contact if it's not our own contact
1875                 $contact = dba::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1876                 if (DBM::is_result($contact)) {
1877                         Contact::unmarkForArchival($contact);
1878                 }
1879
1880                 $update = (!$arr['private'] && (($arr["author-link"] === $arr["owner-link"]) || ($arr["parent-uri"] === $arr["uri"])));
1881
1882                 // Is it a forum? Then we don't care about the rules from above
1883                 if (!$update && ($arr["network"] == NETWORK_DFRN) && ($arr["parent-uri"] === $arr["uri"])) {
1884                         if (dba::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1885                                 $update = true;
1886                         }
1887                 }
1888
1889                 if ($update) {
1890                         dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1891                                 ['id' => $arr['contact-id']]);
1892                 }
1893                 // Now do the same for the system wide contacts with uid=0
1894                 if (!$arr['private']) {
1895                         dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1896                                 ['id' => $arr['owner-id']]);
1897
1898                         if ($arr['owner-id'] != $arr['author-id']) {
1899                                 dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1900                                         ['id' => $arr['author-id']]);
1901                         }
1902                 }
1903         }
1904
1905         public static function setHashtags(&$item)
1906         {
1907
1908                 $tags = get_tags($item["body"]);
1909
1910                 // No hashtags?
1911                 if (!count($tags)) {
1912                         return false;
1913                 }
1914
1915                 // This sorting is important when there are hashtags that are part of other hashtags
1916                 // Otherwise there could be problems with hashtags like #test and #test2
1917                 rsort($tags);
1918
1919                 $URLSearchString = "^\[\]";
1920
1921                 // All hashtags should point to the home server if "local_tags" is activated
1922                 if (Config::get('system', 'local_tags')) {
1923                         $item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1924                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["body"]);
1925
1926                         $item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1927                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["tag"]);
1928                 }
1929
1930                 // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1931                 $item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1932                         function ($match) {
1933                                 return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1934                         }, $item["body"]);
1935
1936                 $item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1937                         function ($match) {
1938                                 return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1939                         }, $item["body"]);
1940
1941                 $item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1942                         function ($match) {
1943                                 return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1944                         }, $item["body"]);
1945
1946                 // Repair recursive urls
1947                 $item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1948                                 "&num;$2", $item["body"]);
1949
1950                 foreach ($tags as $tag) {
1951                         if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=')) {
1952                                 continue;
1953                         }
1954
1955                         $basetag = str_replace('_',' ',substr($tag,1));
1956
1957                         $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . rawurlencode($basetag) . ']' . $basetag . '[/url]';
1958
1959                         $item["body"] = str_replace($tag, $newtag, $item["body"]);
1960
1961                         if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
1962                                 if (strlen($item["tag"])) {
1963                                         $item["tag"] = ','.$item["tag"];
1964                                 }
1965                                 $item["tag"] = $newtag.$item["tag"];
1966                         }
1967                 }
1968
1969                 // Convert back the masked hashtags
1970                 $item["body"] = str_replace("&num;", "#", $item["body"]);
1971         }
1972
1973         public static function getGuidById($id)
1974         {
1975                 $item = dba::selectFirst('item', ['guid'], ['id' => $id]);
1976                 if (DBM::is_result($item)) {
1977                         return $item['guid'];
1978                 } else {
1979                         return '';
1980                 }
1981         }
1982
1983         public static function getIdAndNickByGuid($guid, $uid = 0)
1984         {
1985                 $nick = "";
1986                 $id = 0;
1987
1988                 if ($uid == 0) {
1989                         $uid == local_user();
1990                 }
1991
1992                 // Does the given user have this item?
1993                 if ($uid) {
1994                         $item = dba::fetch_first("SELECT `item`.`id`, `user`.`nickname` FROM `item`
1995                                 INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
1996                                 WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
1997                                         AND `item`.`guid` = ? AND `item`.`uid` = ?", $guid, $uid);
1998                         if (DBM::is_result($item)) {
1999                                 $id = $item["id"];
2000                                 $nick = $item["nickname"];
2001                         }
2002                 }
2003
2004                 // Or is it anywhere on the server?
2005                 if ($nick == "") {
2006                         $item = dba::fetch_first("SELECT `item`.`id`, `user`.`nickname` FROM `item`
2007                                 INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
2008                                 WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
2009                                         AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
2010                                         AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
2011                                         AND NOT `item`.`private` AND `item`.`wall`
2012                                         AND `item`.`guid` = ?", $guid);
2013                         if (DBM::is_result($item)) {
2014                                 $id = $item["id"];
2015                                 $nick = $item["nickname"];
2016                         }
2017                 }
2018                 return ["nick" => $nick, "id" => $id];
2019         }
2020
2021         /**
2022          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
2023          * @param int $uid
2024          * @param int $item_id
2025          * @return bool true if item was deleted, else false
2026          */
2027         private static function tagDeliver($uid, $item_id)
2028         {
2029                 $mention = false;
2030
2031                 $user = dba::selectFirst('user', [], ['uid' => $uid]);
2032                 if (!DBM::is_result($user)) {
2033                         return;
2034                 }
2035
2036                 $community_page = (($user['page-flags'] == PAGE_COMMUNITY) ? true : false);
2037                 $prvgroup = (($user['page-flags'] == PAGE_PRVGROUP) ? true : false);
2038
2039                 $item = dba::selectFirst('item', [], ['id' => $item_id]);
2040                 if (!DBM::is_result($item)) {
2041                         return;
2042                 }
2043
2044                 $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
2045
2046                 /*
2047                  * Diaspora uses their own hardwired link URL in @-tags
2048                  * instead of the one we supply with webfinger
2049                  */
2050                 $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
2051
2052                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2053                 if ($cnt) {
2054                         foreach ($matches as $mtch) {
2055                                 if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
2056                                         $mention = true;
2057                                         logger('mention found: ' . $mtch[2]);
2058                                 }
2059                         }
2060                 }
2061
2062                 if (!$mention) {
2063                         if (($community_page || $prvgroup) &&
2064                                   !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
2065                                 // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
2066                                 // delete it!
2067                                 logger("no-mention top-level post to community or private group. delete.");
2068                                 dba::delete('item', ['id' => $item_id]);
2069                                 return true;
2070                         }
2071                         return;
2072                 }
2073
2074                 $arr = ['item' => $item, 'user' => $user];
2075
2076                 Addon::callHooks('tagged', $arr);
2077
2078                 if (!$community_page && !$prvgroup) {
2079                         return;
2080                 }
2081
2082                 /*
2083                  * tgroup delivery - setup a second delivery chain
2084                  * prevent delivery looping - only proceed
2085                  * if the message originated elsewhere and is a top-level post
2086                  */
2087                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2088                         return;
2089                 }
2090
2091                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2092                 $self = dba::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2093                 if (!DBM::is_result($self)) {
2094                         return;
2095                 }
2096
2097                 $owner_id = Contact::getIdForURL($self['url']);
2098
2099                 // also reset all the privacy bits to the forum default permissions
2100
2101                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
2102
2103                 $forum_mode = ($prvgroup ? 2 : 1);
2104
2105                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2106                         'owner-id' => $owner_id, 'owner-link' => $self['url'], 'private' => $private, 'allow_cid' => $user['allow_cid'],
2107                         'allow_gid' => $user['allow_gid'], 'deny_cid' => $user['deny_cid'], 'deny_gid' => $user['deny_gid']];
2108                 dba::update('item', $fields, ['id' => $item_id]);
2109
2110                 self::updateThread($item_id);
2111
2112                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', 'tgroup', $item_id);
2113         }
2114
2115         public static function isRemoteSelf($contact, &$datarray)
2116         {
2117                 $a = get_app();
2118
2119                 if (!$contact['remote_self']) {
2120                         return false;
2121                 }
2122
2123                 // Prevent the forwarding of posts that are forwarded
2124                 if ($datarray["extid"] == NETWORK_DFRN) {
2125                         logger('Already forwarded', LOGGER_DEBUG);
2126                         return false;
2127                 }
2128
2129                 // Prevent to forward already forwarded posts
2130                 if ($datarray["app"] == $a->get_hostname()) {
2131                         logger('Already forwarded (second test)', LOGGER_DEBUG);
2132                         return false;
2133                 }
2134
2135                 // Only forward posts
2136                 if ($datarray["verb"] != ACTIVITY_POST) {
2137                         logger('No post', LOGGER_DEBUG);
2138                         return false;
2139                 }
2140
2141                 if (($contact['network'] != NETWORK_FEED) && $datarray['private']) {
2142                         logger('Not public', LOGGER_DEBUG);
2143                         return false;
2144                 }
2145
2146                 $datarray2 = $datarray;
2147                 logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
2148                 if ($contact['remote_self'] == 2) {
2149                         $self = dba::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2150                                         ['uid' => $contact['uid'], 'self' => true]);
2151                         if (DBM::is_result($self)) {
2152                                 $datarray['contact-id'] = $self["id"];
2153
2154                                 $datarray['owner-name'] = $self["name"];
2155                                 $datarray['owner-link'] = $self["url"];
2156                                 $datarray['owner-avatar'] = $self["thumb"];
2157
2158                                 $datarray['author-name']   = $datarray['owner-name'];
2159                                 $datarray['author-link']   = $datarray['owner-link'];
2160                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2161
2162                                 unset($datarray['created']);
2163                                 unset($datarray['edited']);
2164
2165                                 unset($datarray['network']);
2166                                 unset($datarray['owner-id']);
2167                                 unset($datarray['author-id']);
2168                         }
2169
2170                         if ($contact['network'] != NETWORK_FEED) {
2171                                 $datarray["guid"] = get_guid(32);
2172                                 unset($datarray["plink"]);
2173                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2174                                 $datarray["parent-uri"] = $datarray["uri"];
2175                                 $datarray["thr-parent"] = $datarray["uri"];
2176                                 $datarray["extid"] = NETWORK_DFRN;
2177                                 $urlpart = parse_url($datarray2['author-link']);
2178                                 $datarray["app"] = $urlpart["host"];
2179                         } else {
2180                                 $datarray['private'] = 0;
2181                         }
2182                 }
2183
2184                 if ($contact['network'] != NETWORK_FEED) {
2185                         // Store the original post
2186                         $result = self::insert($datarray2, false, false);
2187                         logger('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
2188                 } else {
2189                         $datarray["app"] = "Feed";
2190                         $result = true;
2191                 }
2192
2193                 // Trigger automatic reactions for addons
2194                 $datarray['api_source'] = true;
2195
2196                 // We have to tell the hooks who we are - this really should be improved
2197                 $_SESSION["authenticated"] = true;
2198                 $_SESSION["uid"] = $contact['uid'];
2199
2200                 return $result;
2201         }
2202
2203         /**
2204          *
2205          * @param string $s
2206          * @param int    $uid
2207          * @param array  $item
2208          * @param int    $cid
2209          * @return string
2210          */
2211         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2212         {
2213                 if (Config::get('system', 'disable_embedded')) {
2214                         return $s;
2215                 }
2216
2217                 logger('check for photos', LOGGER_DEBUG);
2218                 $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
2219
2220                 $orig_body = $s;
2221                 $new_body = '';
2222
2223                 $img_start = strpos($orig_body, '[img');
2224                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2225                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2226
2227                 while (($img_st_close !== false) && ($img_len !== false)) {
2228                         $img_st_close++; // make it point to AFTER the closing bracket
2229                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2230
2231                         logger('found photo ' . $image, LOGGER_DEBUG);
2232
2233                         if (stristr($image, $site . '/photo/')) {
2234                                 // Only embed locally hosted photos
2235                                 $replace = false;
2236                                 $i = basename($image);
2237                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2238                                 $x = strpos($i, '-');
2239
2240                                 if ($x) {
2241                                         $res = substr($i, $x + 1);
2242                                         $i = substr($i, 0, $x);
2243                                         $fields = ['data', 'type', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
2244                                         $photo = dba::selectFirst('photo', $fields, ['resource-id' => $i, 'scale' => $res, 'uid' => $uid]);
2245                                         if (DBM::is_result($photo)) {
2246                                                 /*
2247                                                  * Check to see if we should replace this photo link with an embedded image
2248                                                  * 1. No need to do so if the photo is public
2249                                                  * 2. If there's a contact-id provided, see if they're in the access list
2250                                                  *    for the photo. If so, embed it.
2251                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2252                                                  *    permissions, regardless of order but first check to see if they're an exact
2253                                                  *    match to save some processing overhead.
2254                                                  */
2255                                                 if (self::hasPermissions($photo)) {
2256                                                         if ($cid) {
2257                                                                 $recips = self::enumeratePermissions($photo);
2258                                                                 if (in_array($cid, $recips)) {
2259                                                                         $replace = true;
2260                                                                 }
2261                                                         } elseif ($item) {
2262                                                                 if (self::samePermissions($item, $photo)) {
2263                                                                         $replace = true;
2264                                                                 }
2265                                                         }
2266                                                 }
2267                                                 if ($replace) {
2268                                                         $data = $photo['data'];
2269                                                         $type = $photo['type'];
2270
2271                                                         // If a custom width and height were specified, apply before embedding
2272                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2273                                                                 logger('scaling photo', LOGGER_DEBUG);
2274
2275                                                                 $width = intval($match[1]);
2276                                                                 $height = intval($match[2]);
2277
2278                                                                 $Image = new Image($data, $type);
2279                                                                 if ($Image->isValid()) {
2280                                                                         $Image->scaleDown(max($width, $height));
2281                                                                         $data = $Image->asString();
2282                                                                         $type = $Image->getType();
2283                                                                 }
2284                                                         }
2285
2286                                                         logger('replacing photo', LOGGER_DEBUG);
2287                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2288                                                         logger('replaced: ' . $image, LOGGER_DATA);
2289                                                 }
2290                                         }
2291                                 }
2292                         }
2293
2294                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2295                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2296                         if ($orig_body === false) {
2297                                 $orig_body = '';
2298                         }
2299
2300                         $img_start = strpos($orig_body, '[img');
2301                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2302                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2303                 }
2304
2305                 $new_body = $new_body . $orig_body;
2306
2307                 return $new_body;
2308         }
2309
2310         private static function hasPermissions($obj)
2311         {
2312                 return (
2313                         (
2314                                 x($obj, 'allow_cid')
2315                         ) || (
2316                                 x($obj, 'allow_gid')
2317                         ) || (
2318                                 x($obj, 'deny_cid')
2319                         ) || (
2320                                 x($obj, 'deny_gid')
2321                         )
2322                 );
2323         }
2324
2325         private static function samePermissions($obj1, $obj2)
2326         {
2327                 // first part is easy. Check that these are exactly the same.
2328                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2329                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2330                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2331                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2332                         return true;
2333                 }
2334
2335                 // This is harder. Parse all the permissions and compare the resulting set.
2336                 $recipients1 = self::enumeratePermissions($obj1);
2337                 $recipients2 = self::enumeratePermissions($obj2);
2338                 sort($recipients1);
2339                 sort($recipients2);
2340
2341                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2342                 return ($recipients1 == $recipients2);
2343         }
2344
2345         // returns an array of contact-ids that are allowed to see this object
2346         private static function enumeratePermissions($obj)
2347         {
2348                 $allow_people = expand_acl($obj['allow_cid']);
2349                 $allow_groups = Group::expand(expand_acl($obj['allow_gid']));
2350                 $deny_people  = expand_acl($obj['deny_cid']);
2351                 $deny_groups  = Group::expand(expand_acl($obj['deny_gid']));
2352                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2353                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2354                 $recipients   = array_diff($recipients, $deny);
2355                 return $recipients;
2356         }
2357
2358         public static function getFeedTags($item)
2359         {
2360                 $ret = [];
2361                 $matches = false;
2362                 $cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2363                 if ($cnt) {
2364                         for ($x = 0; $x < $cnt; $x ++) {
2365                                 if ($matches[1][$x]) {
2366                                         $ret[$matches[2][$x]] = ['#', $matches[1][$x], $matches[2][$x]];
2367                                 }
2368                         }
2369                 }
2370                 $matches = false;
2371                 $cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2372                 if ($cnt) {
2373                         for ($x = 0; $x < $cnt; $x ++) {
2374                                 if ($matches[1][$x]) {
2375                                         $ret[] = ['@', $matches[1][$x], $matches[2][$x]];
2376                                 }
2377                         }
2378                 }
2379                 return $ret;
2380         }
2381
2382         public static function expire($uid, $days, $network = "", $force = false)
2383         {
2384                 if (!$uid || ($days < 1)) {
2385                         return;
2386                 }
2387
2388                 /*
2389                  * $expire_network_only = save your own wall posts
2390                  * and just expire conversations started by others
2391                  */
2392                 $expire_network_only = PConfig::get($uid,'expire', 'network_only');
2393                 $sql_extra = (intval($expire_network_only) ? " AND wall = 0 " : "");
2394
2395                 if ($network != "") {
2396                         $sql_extra .= sprintf(" AND network = '%s' ", dbesc($network));
2397
2398                         /*
2399                          * There is an index "uid_network_received" but not "uid_network_created"
2400                          * This avoids the creation of another index just for one purpose.
2401                          * And it doesn't really matter wether to look at "received" or "created"
2402                          */
2403                         $range = "AND `received` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
2404                 } else {
2405                         $range = "AND `created` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
2406                 }
2407
2408                 $r = q("SELECT `file`, `resource-id`, `starred`, `type`, `id` FROM `item`
2409                         WHERE `uid` = %d $range
2410                         AND `id` = `parent`
2411                         $sql_extra
2412                         AND `deleted` = 0",
2413                         intval($uid),
2414                         intval($days)
2415                 );
2416
2417                 if (!DBM::is_result($r)) {
2418                         return;
2419                 }
2420
2421                 $expire_items = PConfig::get($uid, 'expire', 'items', 1);
2422
2423                 // Forcing expiring of items - but not notes and marked items
2424                 if ($force) {
2425                         $expire_items = true;
2426                 }
2427
2428                 $expire_notes = PConfig::get($uid, 'expire', 'notes', 1);
2429                 $expire_starred = PConfig::get($uid, 'expire', 'starred', 1);
2430                 $expire_photos = PConfig::get($uid, 'expire', 'photos', 0);
2431
2432                 logger('User '.$uid.': expire: # items=' . count($r). "; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2433
2434                 foreach ($r as $item) {
2435
2436                         // don't expire filed items
2437
2438                         if (strpos($item['file'],'[') !== false) {
2439                                 continue;
2440                         }
2441
2442                         // Only expire posts, not photos and photo comments
2443
2444                         if ($expire_photos == 0 && strlen($item['resource-id'])) {
2445                                 continue;
2446                         } elseif ($expire_starred == 0 && intval($item['starred'])) {
2447                                 continue;
2448                         } elseif ($expire_notes == 0 && $item['type'] == 'note') {
2449                                 continue;
2450                         } elseif ($expire_items == 0 && $item['type'] != 'note') {
2451                                 continue;
2452                         }
2453
2454                         self::deleteById($item['id'], PRIORITY_LOW);
2455                 }
2456         }
2457
2458         public static function firstPostDate($uid, $wall = false)
2459         {
2460                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2461                 $params = ['order' => ['created' => false]];
2462                 $thread = dba::selectFirst('thread', ['created'], $condition, $params);
2463                 if (DBM::is_result($thread)) {
2464                         return substr(DateTimeFormat::local($thread['created']), 0, 10);
2465                 }
2466                 return false;
2467         }
2468
2469         /**
2470          * @brief add/remove activity to an item
2471          *
2472          * Toggle activities as like,dislike,attend of an item
2473          *
2474          * @param string $item_id
2475          * @param string $verb
2476          *              Activity verb. One of
2477          *                      like, unlike, dislike, undislike, attendyes, unattendyes,
2478          *                      attendno, unattendno, attendmaybe, unattendmaybe
2479          * @hook 'post_local_end'
2480          *              array $arr
2481          *                      'post_id' => ID of posted item
2482          */
2483         public static function performLike($item_id, $verb)
2484         {
2485                 if (!local_user() && !remote_user()) {
2486                         return false;
2487                 }
2488
2489                 switch ($verb) {
2490                         case 'like':
2491                         case 'unlike':
2492                                 $bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
2493                                 $activity = ACTIVITY_LIKE;
2494                                 break;
2495                         case 'dislike':
2496                         case 'undislike':
2497                                 $bodyverb = L10n::t('%1$s doesn\'t like %2$s\'s %3$s');
2498                                 $activity = ACTIVITY_DISLIKE;
2499                                 break;
2500                         case 'attendyes':
2501                         case 'unattendyes':
2502                                 $bodyverb = L10n::t('%1$s is attending %2$s\'s %3$s');
2503                                 $activity = ACTIVITY_ATTEND;
2504                                 break;
2505                         case 'attendno':
2506                         case 'unattendno':
2507                                 $bodyverb = L10n::t('%1$s is not attending %2$s\'s %3$s');
2508                                 $activity = ACTIVITY_ATTENDNO;
2509                                 break;
2510                         case 'attendmaybe':
2511                         case 'unattendmaybe':
2512                                 $bodyverb = L10n::t('%1$s may attend %2$s\'s %3$s');
2513                                 $activity = ACTIVITY_ATTENDMAYBE;
2514                                 break;
2515                         default:
2516                                 logger('like: unknown verb ' . $verb . ' for item ' . $item_id);
2517                                 return false;
2518                 }
2519
2520                 // Enable activity toggling instead of on/off
2521                 $event_verb_flag = $activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE;
2522
2523                 logger('like: verb ' . $verb . ' item ' . $item_id);
2524
2525                 $item = dba::selectFirst('item', [], ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
2526                 if (!DBM::is_result($item)) {
2527                         logger('like: unknown item ' . $item_id);
2528                         return false;
2529                 }
2530
2531                 $uid = $item['uid'];
2532                 if (($uid == 0) && local_user()) {
2533                         $uid = local_user();
2534                 }
2535
2536                 if (!can_write_wall($uid)) {
2537                         logger('like: unable to write on wall ' . $uid);
2538                         return false;
2539                 }
2540
2541                 // Retrieves the local post owner
2542                 $owner_self_contact = dba::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
2543                 if (!DBM::is_result($owner_self_contact)) {
2544                         logger('like: unknown owner ' . $uid);
2545                         return false;
2546                 }
2547
2548                 // Retrieve the current logged in user's public contact
2549                 $author_id = public_contact();
2550
2551                 $author_contact = dba::selectFirst('contact', [], ['id' => $author_id]);
2552                 if (!DBM::is_result($author_contact)) {
2553                         logger('like: unknown author ' . $author_id);
2554                         return false;
2555                 }
2556
2557                 // Contact-id is the uid-dependant author contact
2558                 if (local_user() == $uid) {
2559                         $item_contact_id = $owner_self_contact['id'];
2560                         $item_contact = $owner_self_contact;
2561                 } else {
2562                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
2563                         $item_contact = dba::selectFirst('contact', [], ['id' => $item_contact_id]);
2564                         if (!DBM::is_result($item_contact)) {
2565                                 logger('like: unknown item contact ' . $item_contact_id);
2566                                 return false;
2567                         }
2568                 }
2569
2570                 // Look for an existing verb row
2571                 // event participation are essentially radio toggles. If you make a subsequent choice,
2572                 // we need to eradicate your first choice.
2573                 if ($event_verb_flag) {
2574                         $verbs = "'" . dbesc(ACTIVITY_ATTEND) . "', '" . dbesc(ACTIVITY_ATTENDNO) . "', '" . dbesc(ACTIVITY_ATTENDMAYBE) . "'";
2575                 } else {
2576                         $verbs = "'".dbesc($activity)."'";
2577                 }
2578
2579                 /// @todo This query is expected to be a performance eater due to the "OR" - it has to be changed totally
2580                 $existing_like = q("SELECT `id`, `guid`, `verb` FROM `item`
2581                         WHERE `verb` IN ($verbs)
2582                         AND `deleted` = 0
2583                         AND `author-id` = %d
2584                         AND `uid` = %d
2585                         AND (`parent` = '%s' OR `parent-uri` = '%s' OR `thr-parent` = '%s')
2586                         LIMIT 1",
2587                         intval($author_contact['id']),
2588                         intval($item['uid']),
2589                         dbesc($item_id), dbesc($item_id), dbesc($item['uri'])
2590                 );
2591
2592                 // If it exists, mark it as deleted
2593                 if (DBM::is_result($existing_like)) {
2594                         $like_item = $existing_like[0];
2595
2596                         // Already voted, undo it
2597                         $fields = ['deleted' => true, 'unseen' => true, 'changed' => DateTimeFormat::utcNow()];
2598                         dba::update('item', $fields, ['id' => $like_item['id']]);
2599
2600                         // Clean up the Diaspora signatures for this like
2601                         // Go ahead and do it even if Diaspora support is disabled. We still want to clean up
2602                         // if it had been enabled in the past
2603                         dba::delete('sign', ['iid' => $like_item['id']]);
2604
2605                         $like_item_id = $like_item['id'];
2606                         Worker::add(PRIORITY_HIGH, "Notifier", "like", $like_item_id);
2607
2608                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2609                                 return true;
2610                         }
2611                 }
2612
2613                 // Verb is "un-something", just trying to delete existing entries
2614                 if (strpos($verb, 'un') === 0) {
2615                         return true;
2616                 }
2617
2618                 // Else or if event verb different from existing row, create a new item row
2619                 $post_type = (($item['resource-id']) ? L10n::t('photo') : L10n::t('status'));
2620                 if ($item['object-type'] === ACTIVITY_OBJ_EVENT) {
2621                         $post_type = L10n::t('event');
2622                 }
2623                 $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE ;
2624                 $link = xmlify('<link rel="alternate" type="text/html" href="' . System::baseUrl() . '/display/' . $owner_self_contact['nick'] . '/' . $item['id'] . '" />' . "\n") ;
2625                 $body = $item['body'];
2626
2627                 $obj = <<< EOT
2628
2629                 <object>
2630                         <type>$objtype</type>
2631                         <local>1</local>
2632                         <id>{$item['uri']}</id>
2633                         <link>$link</link>
2634                         <title></title>
2635                         <content>$body</content>
2636                 </object>
2637 EOT;
2638
2639                 $ulink = '[url=' . $author_contact['url'] . ']' . $author_contact['name'] . '[/url]';
2640                 $alink = '[url=' . $item['author-link'] . ']' . $item['author-name'] . '[/url]';
2641                 $plink = '[url=' . System::baseUrl() . '/display/' . $owner_self_contact['nick'] . '/' . $item['id'] . ']' . $post_type . '[/url]';
2642
2643                 $new_item = [
2644                         'guid'          => get_guid(32),
2645                         'uri'           => self::newURI($item['uid']),
2646                         'uid'           => $item['uid'],
2647                         'contact-id'    => $item_contact_id,
2648                         'type'          => 'activity',
2649                         'wall'          => $item['wall'],
2650                         'origin'        => 1,
2651                         'gravity'       => GRAVITY_LIKE,
2652                         'parent'        => $item['id'],
2653                         'parent-uri'    => $item['uri'],
2654                         'thr-parent'    => $item['uri'],
2655                         'owner-id'      => $item['owner-id'],
2656                         'owner-name'    => $item['owner-name'],
2657                         'owner-link'    => $item['owner-link'],
2658                         'owner-avatar'  => $item['owner-avatar'],
2659                         'author-id'     => $author_contact['id'],
2660                         'author-name'   => $author_contact['name'],
2661                         'author-link'   => $author_contact['url'],
2662                         'author-avatar' => $author_contact['thumb'],
2663                         'body'          => sprintf($bodyverb, $ulink, $alink, $plink),
2664                         'verb'          => $activity,
2665                         'object-type'   => $objtype,
2666                         'object'        => $obj,
2667                         'allow_cid'     => $item['allow_cid'],
2668                         'allow_gid'     => $item['allow_gid'],
2669                         'deny_cid'      => $item['deny_cid'],
2670                         'deny_gid'      => $item['deny_gid'],
2671                         'visible'       => 1,
2672                         'unseen'        => 1,
2673                 ];
2674
2675                 $new_item_id = self::insert($new_item);
2676
2677                 // If the parent item isn't visible then set it to visible
2678                 if (!$item['visible']) {
2679                         self::update(['visible' => true], ['id' => $item['id']]);
2680                 }
2681
2682                 // Save the author information for the like in case we need to relay to Diaspora
2683                 Diaspora::storeLikeSignature($item_contact, $new_item_id);
2684
2685                 $new_item['id'] = $new_item_id;
2686
2687                 Addon::callHooks('post_local_end', $new_item);
2688
2689                 Worker::add(PRIORITY_HIGH, "Notifier", "like", $new_item_id);
2690
2691                 return true;
2692         }
2693
2694         private static function addThread($itemid, $onlyshadow = false)
2695         {
2696                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2697                         'moderated', 'visible', 'starred', 'bookmark', 'contact-id',
2698                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2699                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2700                 $item = dba::selectFirst('item', $fields, $condition);
2701
2702                 if (!DBM::is_result($item)) {
2703                         return;
2704                 }
2705
2706                 $item['iid'] = $itemid;
2707
2708                 if (!$onlyshadow) {
2709                         $result = dba::insert('thread', $item);
2710
2711                         logger("Add thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
2712                 }
2713         }
2714
2715         private static function updateThread($itemid, $setmention = false)
2716         {
2717                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed',
2718                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark', 'contact-id',
2719                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
2720                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2721
2722                 $item = dba::selectFirst('item', $fields, $condition);
2723                 if (!DBM::is_result($item)) {
2724                         return;
2725                 }
2726
2727                 if ($setmention) {
2728                         $item["mention"] = 1;
2729                 }
2730
2731                 $sql = "";
2732
2733                 $fields = [];
2734
2735                 foreach ($item as $field => $data) {
2736                         if (!in_array($field, ["guid"])) {
2737                                 $fields[$field] = $data;
2738                         }
2739                 }
2740
2741                 $result = dba::update('thread', $fields, ['iid' => $itemid]);
2742
2743                 logger("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, LOGGER_DEBUG);
2744         }
2745
2746         private static function deleteThread($itemid, $itemuri = "")
2747         {
2748                 $item = dba::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2749                 if (!DBM::is_result($item)) {
2750                         logger('No thread found for id '.$itemid, LOGGER_DEBUG);
2751                         return;
2752                 }
2753
2754                 // Using dba::delete at this time could delete the associated item entries
2755                 $result = dba::e("DELETE FROM `thread` WHERE `iid` = ?", $itemid);
2756
2757                 logger("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
2758
2759                 if ($itemuri != "") {
2760                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
2761                         if (!dba::exists('item', $condition)) {
2762                                 dba::delete('item', ['uri' => $itemuri, 'uid' => 0]);
2763                                 logger("deleteThread: Deleted shadow for item ".$itemuri, LOGGER_DEBUG);
2764                         }
2765                 }
2766         }
2767 }