src/Model/Item.php

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