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\BBCode;
  11 use Friendica\Content\Text\HTML;
  12 use Friendica\Core\Config;
  13 use Friendica\Core\Hook;
  14 use Friendica\Core\L10n;
  15 use Friendica\Core\Lock;
  16 use Friendica\Core\Logger;
  17 use Friendica\Core\PConfig;
  18 use Friendica\Core\Protocol;
  19 use Friendica\Core\Renderer;
  20 use Friendica\Core\Session;
  21 use Friendica\Core\System;
  22 use Friendica\Core\Worker;
  23 use Friendica\Database\DBA;
  24 use Friendica\Protocol\Activity;
  25 use Friendica\Protocol\ActivityPub;
  26 use Friendica\Protocol\Diaspora;
  27 use Friendica\Protocol\OStatus;
  28 use Friendica\Util\ACLFormatter;
  29 use Friendica\Util\DateTimeFormat;
  30 use Friendica\Util\Map;
  31 use Friendica\Util\Network;
  32 use Friendica\Util\Security;
  33 use Friendica\Util\Strings;
  34 use Friendica\Util\XML;
  35 use Friendica\Worker\Delivery;
  36 use Text_LanguageDetect;
  37
  38 class Item extends BaseObject
  39 {
  40         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  41         const PT_ARTICLE = 0;
  42         const PT_NOTE = 1;
  43         const PT_PAGE = 2;
  44         const PT_IMAGE = 16;
  45         const PT_AUDIO = 17;
  46         const PT_VIDEO = 18;
  47         const PT_DOCUMENT = 19;
  48         const PT_EVENT = 32;
  49         const PT_PERSONAL_NOTE = 128;
  50
  51         // Field list that is used to display the items
  52         const DISPLAY_FIELDLIST = [
  53                 'uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network', 'gravity',
  54                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  55                 'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'attach', 'language',
  56                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  57                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  58                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  59                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
  60                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  61                 'writable', 'self', 'cid', 'alias',
  62                 'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  63                 'event-summary', 'event-desc', 'event-location', 'event-type',
  64                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  65                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  66         ];
  67
  68         // Field list that is used to deliver items via the protocols
  69         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri', 'thr-parent', 'parent-uri', 'guid',
  70                         'parent-guid', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  71                         'private', 'title', 'body', 'location', 'coord', 'app',
  72                         'attach', 'tag', 'deleted', 'extid', 'post-type',
  73                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  74                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  75                         'signed_text', 'signature', 'signer', 'network'];
  76
  77         // Field list for "item-content" table that is mixed with the item table
  78         const MIXED_CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
  79                         'coord', 'app', 'rendered-hash', 'rendered-html', 'verb',
  80                         'object-type', 'object', 'target-type', 'target', 'plink'];
  81
  82         // Field list for "item-content" table that is not present in the "item" table
  83         const CONTENT_FIELDLIST = ['language'];
  84
  85         // All fields in the item table
  86         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent', 'guid',
  87                         'contact-id', 'type', 'wall', 'gravity', 'extid', 'icid', 'iaid', 'psid',
  88                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
  89                         'postopts', 'plink', 'resource-id', 'event-id', 'tag', 'attach', 'inform',
  90                         'file', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
  91                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
  92                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
  93                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
  94                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
  95                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  96                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar'];
  97
  98         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
  99         // The item-activity table only stores the index and needs this array to know the matching activity.
 100         const ACTIVITIES = [
 101                 Activity::LIKE, Activity::DISLIKE,
 102                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 103                 Activity::FOLLOW,
 104                 Activity::ANNOUNCE];
 105
 106         private static $legacy_mode = null;
 107
 108         public static function isLegacyMode()
 109         {
 110                 if (is_null(self::$legacy_mode)) {
 111                         self::$legacy_mode = (Config::get("system", "post_update_version") < 1279);
 112                 }
 113
 114                 return self::$legacy_mode;
 115         }
 116
 117         /**
 118          * @brief returns an activity index from an activity string
 119          *
 120          * @param string $activity activity string
 121          * @return integer Activity index
 122          */
 123         public static function activityToIndex($activity)
 124         {
 125                 $index = array_search($activity, self::ACTIVITIES);
 126
 127                 if (is_bool($index)) {
 128                         $index = -1;
 129                 }
 130
 131                 return $index;
 132         }
 133
 134         /**
 135          * @brief returns an activity string from an activity index
 136          *
 137          * @param integer $index activity index
 138          * @return string Activity string
 139          */
 140         private static function indexToActivity($index)
 141         {
 142                 if (is_null($index) || !array_key_exists($index, self::ACTIVITIES)) {
 143                         return '';
 144                 }
 145
 146                 return self::ACTIVITIES[$index];
 147         }
 148
 149         /**
 150          * @brief Fetch a single item row
 151          *
 152          * @param mixed $stmt statement object
 153          * @return array current row
 154          */
 155         public static function fetch($stmt)
 156         {
 157                 $row = DBA::fetch($stmt);
 158
 159                 if (is_bool($row)) {
 160                         return $row;
 161                 }
 162
 163                 // ---------------------- Transform item structure data ----------------------
 164
 165                 // We prefer the data from the user's contact over the public one
 166                 if (!empty($row['author-link']) && !empty($row['contact-link']) &&
 167                         ($row['author-link'] == $row['contact-link'])) {
 168                         if (isset($row['author-avatar']) && !empty($row['contact-avatar'])) {
 169                                 $row['author-avatar'] = $row['contact-avatar'];
 170                         }
 171                         if (isset($row['author-name']) && !empty($row['contact-name'])) {
 172                                 $row['author-name'] = $row['contact-name'];
 173                         }
 174                 }
 175
 176                 if (!empty($row['owner-link']) && !empty($row['contact-link']) &&
 177                         ($row['owner-link'] == $row['contact-link'])) {
 178                         if (isset($row['owner-avatar']) && !empty($row['contact-avatar'])) {
 179                                 $row['owner-avatar'] = $row['contact-avatar'];
 180                         }
 181                         if (isset($row['owner-name']) && !empty($row['contact-name'])) {
 182                                 $row['owner-name'] = $row['contact-name'];
 183                         }
 184                 }
 185
 186                 // We can always comment on posts from these networks
 187                 if (array_key_exists('writable', $row) &&
 188                         in_array($row['internal-network'], Protocol::FEDERATED)) {
 189                         $row['writable'] = true;
 190                 }
 191
 192                 // ---------------------- Transform item content data ----------------------
 193
 194                 // Fetch data from the item-content table whenever there is content there
 195                 if (self::isLegacyMode()) {
 196                         $legacy_fields = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
 197                         foreach ($legacy_fields as $field) {
 198                                 if (empty($row[$field]) && !empty($row['internal-item-' . $field])) {
 199                                         $row[$field] = $row['internal-item-' . $field];
 200                                 }
 201                                 unset($row['internal-item-' . $field]);
 202                         }
 203                 }
 204
 205                 if (!empty($row['internal-iaid']) && array_key_exists('verb', $row)) {
 206                         $row['verb'] = self::indexToActivity($row['internal-activity']);
 207                         if (array_key_exists('title', $row)) {
 208                                 $row['title'] = '';
 209                         }
 210                         if (array_key_exists('body', $row)) {
 211                                 $row['body'] = $row['verb'];
 212                         }
 213                         if (array_key_exists('object', $row)) {
 214                                 $row['object'] = '';
 215                         }
 216                         if (array_key_exists('object-type', $row)) {
 217                                 $row['object-type'] = Activity\ObjectType::NOTE;
 218                         }
 219                 } elseif (array_key_exists('verb', $row) && in_array($row['verb'], ['', Activity::POST, Activity::SHARE])) {
 220                         // Posts don't have an object or target - but having tags or files.
 221                         // We safe some performance by building tag and file strings only here.
 222                         // We remove object and target since they aren't used for this type.
 223                         if (array_key_exists('object', $row)) {
 224                                 $row['object'] = '';
 225                         }
 226                         if (array_key_exists('target', $row)) {
 227                                 $row['target'] = '';
 228                         }
 229                 }
 230
 231                 if (!array_key_exists('verb', $row) || in_array($row['verb'], ['', Activity::POST, Activity::SHARE])) {
 232                         // Build the tag string out of the term entries
 233                         if (array_key_exists('tag', $row) && empty($row['tag'])) {
 234                                 $row['tag'] = Term::tagTextFromItemId($row['internal-iid']);
 235                         }
 236
 237                         // Build the file string out of the term entries
 238                         if (array_key_exists('file', $row) && empty($row['file'])) {
 239                                 $row['file'] = Term::fileTextFromItemId($row['internal-iid']);
 240                         }
 241                 }
 242
 243                 if (array_key_exists('signed_text', $row) && array_key_exists('interaction', $row) && !is_null($row['interaction'])) {
 244                         $row['signed_text'] = $row['interaction'];
 245                 }
 246
 247                 if (array_key_exists('ignored', $row) && array_key_exists('internal-user-ignored', $row) && !is_null($row['internal-user-ignored'])) {
 248                         $row['ignored'] = $row['internal-user-ignored'];
 249                 }
 250
 251                 // Remove internal fields
 252                 unset($row['internal-activity']);
 253                 unset($row['internal-network']);
 254                 unset($row['internal-iid']);
 255                 unset($row['internal-iaid']);
 256                 unset($row['internal-icid']);
 257                 unset($row['internal-user-ignored']);
 258                 unset($row['interaction']);
 259
 260                 return $row;
 261         }
 262
 263         /**
 264          * @brief Fills an array with data from an item query
 265          *
 266          * @param object $stmt statement object
 267          * @param bool   $do_close
 268          * @return array Data array
 269          */
 270         public static function inArray($stmt, $do_close = true) {
 271                 if (is_bool($stmt)) {
 272                         return $stmt;
 273                 }
 274
 275                 $data = [];
 276                 while ($row = self::fetch($stmt)) {
 277                         $data[] = $row;
 278                 }
 279                 if ($do_close) {
 280                         DBA::close($stmt);
 281                 }
 282                 return $data;
 283         }
 284
 285         /**
 286          * @brief Check if item data exists
 287          *
 288          * @param array $condition array of fields for condition
 289          *
 290          * @return boolean Are there rows for that condition?
 291          * @throws \Exception
 292          */
 293         public static function exists($condition) {
 294                 $stmt = self::select(['id'], $condition, ['limit' => 1]);
 295
 296                 if (is_bool($stmt)) {
 297                         $retval = $stmt;
 298                 } else {
 299                         $retval = (DBA::numRows($stmt) > 0);
 300                 }
 301
 302                 DBA::close($stmt);
 303
 304                 return $retval;
 305         }
 306
 307         /**
 308          * Retrieve a single record from the item table for a given user and returns it in an associative array
 309          *
 310          * @brief Retrieve a single record from a table
 311          * @param integer $uid User ID
 312          * @param array   $selected
 313          * @param array   $condition
 314          * @param array   $params
 315          * @return bool|array
 316          * @throws \Exception
 317          * @see   DBA::select
 318          */
 319         public static function selectFirstForUser($uid, array $selected = [], array $condition = [], $params = [])
 320         {
 321                 $params['uid'] = $uid;
 322
 323                 if (empty($selected)) {
 324                         $selected = Item::DISPLAY_FIELDLIST;
 325                 }
 326
 327                 return self::selectFirst($selected, $condition, $params);
 328         }
 329
 330         /**
 331          * @brief Select rows from the item table for a given user
 332          *
 333          * @param integer $uid       User ID
 334          * @param array   $selected  Array of selected fields, empty for all
 335          * @param array   $condition Array of fields for condition
 336          * @param array   $params    Array of several parameters
 337          *
 338          * @return boolean|object
 339          * @throws \Exception
 340          */
 341         public static function selectForUser($uid, array $selected = [], array $condition = [], $params = [])
 342         {
 343                 $params['uid'] = $uid;
 344
 345                 if (empty($selected)) {
 346                         $selected = Item::DISPLAY_FIELDLIST;
 347                 }
 348
 349                 return self::select($selected, $condition, $params);
 350         }
 351
 352         /**
 353          * Retrieve a single record from the item table and returns it in an associative array
 354          *
 355          * @brief Retrieve a single record from a table
 356          * @param array $fields
 357          * @param array $condition
 358          * @param array $params
 359          * @return bool|array
 360          * @throws \Exception
 361          * @see   DBA::select
 362          */
 363         public static function selectFirst(array $fields = [], array $condition = [], $params = [])
 364         {
 365                 $params['limit'] = 1;
 366
 367                 $result = self::select($fields, $condition, $params);
 368
 369                 if (is_bool($result)) {
 370                         return $result;
 371                 } else {
 372                         $row = self::fetch($result);
 373                         DBA::close($result);
 374                         return $row;
 375                 }
 376         }
 377
 378         /**
 379          * @brief Select rows from the item table and returns them as an array
 380          *
 381          * @param array $selected  Array of selected fields, empty for all
 382          * @param array $condition Array of fields for condition
 383          * @param array $params    Array of several parameters
 384          *
 385          * @return array
 386          * @throws \Exception
 387          */
 388         public static function selectToArray(array $fields = [], array $condition = [], $params = [])
 389         {
 390                 $result = self::select($fields, $condition, $params);
 391
 392                 if (is_bool($result)) {
 393                         return [];
 394                 }
 395
 396                 $data = [];
 397                 while ($row = self::fetch($result)) {
 398                         $data[] = $row;
 399                 }
 400                 DBA::close($result);
 401
 402                 return $data;
 403         }
 404
 405         /**
 406          * @brief Select rows from the item table
 407          *
 408          * @param array $selected  Array of selected fields, empty for all
 409          * @param array $condition Array of fields for condition
 410          * @param array $params    Array of several parameters
 411          *
 412          * @return boolean|object
 413          * @throws \Exception
 414          */
 415         public static function select(array $selected = [], array $condition = [], $params = [])
 416         {
 417                 $uid = 0;
 418                 $usermode = false;
 419
 420                 if (isset($params['uid'])) {
 421                         $uid = $params['uid'];
 422                         $usermode = true;
 423                 }
 424
 425                 $fields = self::fieldlist($usermode);
 426
 427                 $select_fields = self::constructSelectFields($fields, $selected);
 428
 429                 $condition_string = DBA::buildCondition($condition);
 430
 431                 $condition_string = self::addTablesToFields($condition_string, $fields);
 432
 433                 if ($usermode) {
 434                         $condition_string = $condition_string . ' AND ' . self::condition(false);
 435                 }
 436
 437                 $param_string = self::addTablesToFields(DBA::buildParameter($params), $fields);
 438
 439                 $table = "`item` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, false, $usermode);
 440
 441                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 442
 443                 return DBA::p($sql, $condition);
 444         }
 445
 446         /**
 447          * @brief Select rows from the starting post in the item table
 448          *
 449          * @param integer $uid       User ID
 450          * @param array   $selected
 451          * @param array   $condition Array of fields for condition
 452          * @param array   $params    Array of several parameters
 453          *
 454          * @return boolean|object
 455          * @throws \Exception
 456          */
 457         public static function selectThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 458         {
 459                 $params['uid'] = $uid;
 460
 461                 if (empty($selected)) {
 462                         $selected = Item::DISPLAY_FIELDLIST;
 463                 }
 464
 465                 return self::selectThread($selected, $condition, $params);
 466         }
 467
 468         /**
 469          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 470          *
 471          * @brief Retrieve a single record from a table
 472          * @param integer $uid User ID
 473          * @param array   $selected
 474          * @param array   $condition
 475          * @param array   $params
 476          * @return bool|array
 477          * @throws \Exception
 478          * @see   DBA::select
 479          */
 480         public static function selectFirstThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 481         {
 482                 $params['uid'] = $uid;
 483
 484                 if (empty($selected)) {
 485                         $selected = Item::DISPLAY_FIELDLIST;
 486                 }
 487
 488                 return self::selectFirstThread($selected, $condition, $params);
 489         }
 490
 491         /**
 492          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 493          *
 494          * @brief Retrieve a single record from a table
 495          * @param array $fields
 496          * @param array $condition
 497          * @param array $params
 498          * @return bool|array
 499          * @throws \Exception
 500          * @see   DBA::select
 501          */
 502         public static function selectFirstThread(array $fields = [], array $condition = [], $params = [])
 503         {
 504                 $params['limit'] = 1;
 505                 $result = self::selectThread($fields, $condition, $params);
 506
 507                 if (is_bool($result)) {
 508                         return $result;
 509                 } else {
 510                         $row = self::fetch($result);
 511                         DBA::close($result);
 512                         return $row;
 513                 }
 514         }
 515
 516         /**
 517          * @brief Select rows from the starting post in the item table
 518          *
 519          * @param array $selected  Array of selected fields, empty for all
 520          * @param array $condition Array of fields for condition
 521          * @param array $params    Array of several parameters
 522          *
 523          * @return boolean|object
 524          * @throws \Exception
 525          */
 526         public static function selectThread(array $selected = [], array $condition = [], $params = [])
 527         {
 528                 $uid = 0;
 529                 $usermode = false;
 530
 531                 if (isset($params['uid'])) {
 532                         $uid = $params['uid'];
 533                         $usermode = true;
 534                 }
 535
 536                 $fields = self::fieldlist($usermode);
 537
 538                 $fields['thread'] = ['mention', 'ignored', 'iid'];
 539
 540                 $threadfields = ['thread' => ['iid', 'uid', 'contact-id', 'owner-id', 'author-id',
 541                         'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private',
 542                         'pubmail', 'moderated', 'visible', 'starred', 'ignored', 'post-type',
 543                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'network']];
 544
 545                 $select_fields = self::constructSelectFields($fields, $selected);
 546
 547                 $condition_string = DBA::buildCondition($condition);
 548
 549                 $condition_string = self::addTablesToFields($condition_string, $threadfields);
 550                 $condition_string = self::addTablesToFields($condition_string, $fields);
 551
 552                 if ($usermode) {
 553                         $condition_string = $condition_string . ' AND ' . self::condition(true);
 554                 }
 555
 556                 $param_string = DBA::buildParameter($params);
 557                 $param_string = self::addTablesToFields($param_string, $threadfields);
 558                 $param_string = self::addTablesToFields($param_string, $fields);
 559
 560                 $table = "`thread` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, true, $usermode);
 561
 562                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 563
 564                 return DBA::p($sql, $condition);
 565         }
 566
 567         /**
 568          * @brief Returns a list of fields that are associated with the item table
 569          *
 570          * @param $usermode
 571          * @return array field list
 572          */
 573         private static function fieldlist($usermode)
 574         {
 575                 $fields = [];
 576
 577                 $fields['item'] = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent', 'guid',
 578                         'contact-id', 'owner-id', 'author-id', 'type', 'wall', 'gravity', 'extid',
 579                         'created', 'edited', 'commented', 'received', 'changed', 'psid',
 580                         'resource-id', 'event-id', 'tag', 'attach', 'post-type', 'file',
 581                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 582                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global',
 583                         'id' => 'item_id', 'network', 'icid', 'iaid', 'id' => 'internal-iid',
 584                         'network' => 'internal-network', 'icid' => 'internal-icid',
 585                         'iaid' => 'internal-iaid'];
 586
 587                 if ($usermode) {
 588                         $fields['user-item'] = ['ignored' => 'internal-user-ignored'];
 589                 }
 590
 591                 $fields['item-activity'] = ['activity', 'activity' => 'internal-activity'];
 592
 593                 $fields['item-content'] = array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST);
 594
 595                 $fields['item-delivery-data'] = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, ItemDeliveryData::FIELD_LIST);
 596
 597                 $fields['permissionset'] = ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
 598
 599                 $fields['author'] = ['url' => 'author-link', 'name' => 'author-name', 'addr' => 'author-addr',
 600                         'thumb' => 'author-avatar', 'nick' => 'author-nick', 'network' => 'author-network'];
 601
 602                 $fields['owner'] = ['url' => 'owner-link', 'name' => 'owner-name', 'addr' => 'owner-addr',
 603                         'thumb' => 'owner-avatar', 'nick' => 'owner-nick', 'network' => 'owner-network'];
 604
 605                 $fields['contact'] = ['url' => 'contact-link', 'name' => 'contact-name', 'thumb' => 'contact-avatar',
 606                         'writable', 'self', 'id' => 'cid', 'alias', 'uid' => 'contact-uid',
 607                         'photo', 'name-date', 'uri-date', 'avatar-date', 'thumb', 'dfrn-id'];
 608
 609                 $fields['parent-item'] = ['guid' => 'parent-guid', 'network' => 'parent-network'];
 610
 611                 $fields['parent-item-author'] = ['url' => 'parent-author-link', 'name' => 'parent-author-name'];
 612
 613                 $fields['event'] = ['created' => 'event-created', 'edited' => 'event-edited',
 614                         'start' => 'event-start','finish' => 'event-finish',
 615                         'summary' => 'event-summary','desc' => 'event-desc',
 616                         'location' => 'event-location', 'type' => 'event-type',
 617                         'nofinish' => 'event-nofinish','adjust' => 'event-adjust',
 618                         'ignore' => 'event-ignore', 'id' => 'event-id'];
 619
 620                 $fields['sign'] = ['signed_text', 'signature', 'signer'];
 621
 622                 $fields['diaspora-interaction'] = ['interaction'];
 623
 624                 return $fields;
 625         }
 626
 627         /**
 628          * @brief Returns SQL condition for the "select" functions
 629          *
 630          * @param boolean $thread_mode Called for the items (false) or for the threads (true)
 631          *
 632          * @return string SQL condition
 633          */
 634         private static function condition($thread_mode)
 635         {
 636                 if ($thread_mode) {
 637                         $master_table = "`thread`";
 638                 } else {
 639                         $master_table = "`item`";
 640                 }
 641                 return sprintf("$master_table.`visible` AND NOT $master_table.`deleted` AND NOT $master_table.`moderated`
 642                         AND (`user-item`.`hidden` IS NULL OR NOT `user-item`.`hidden`)
 643                         AND (`user-author`.`blocked` IS NULL OR NOT `user-author`.`blocked`)
 644                         AND (`user-author`.`ignored` IS NULL OR NOT `user-author`.`ignored` OR `item`.`gravity` != %d)
 645                         AND (`user-owner`.`blocked` IS NULL OR NOT `user-owner`.`blocked`)
 646                         AND (`user-owner`.`ignored` IS NULL OR NOT `user-owner`.`ignored` OR `item`.`gravity` != %d) ",
 647                         GRAVITY_PARENT, GRAVITY_PARENT);
 648         }
 649
 650         /**
 651          * @brief Returns all needed "JOIN" commands for the "select" functions
 652          *
 653          * @param integer $uid          User ID
 654          * @param string  $sql_commands The parts of the built SQL commands in the "select" functions
 655          * @param boolean $thread_mode  Called for the items (false) or for the threads (true)
 656          *
 657          * @param         $user_mode
 658          * @return string The SQL joins for the "select" functions
 659          */
 660         private static function constructJoins($uid, $sql_commands, $thread_mode, $user_mode)
 661         {
 662                 if ($thread_mode) {
 663                         $master_table = "`thread`";
 664                         $master_table_key = "`thread`.`iid`";
 665                         $joins = "STRAIGHT_JOIN `item` ON `item`.`id` = `thread`.`iid` ";
 666                 } else {
 667                         $master_table = "`item`";
 668                         $master_table_key = "`item`.`id`";
 669                         $joins = '';
 670                 }
 671
 672                 if ($user_mode) {
 673                         $joins .= sprintf("STRAIGHT_JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`
 674                                 AND NOT `contact`.`blocked`
 675                                 AND ((NOT `contact`.`readonly` AND NOT `contact`.`pending` AND (`contact`.`rel` IN (%s, %s)))
 676                                 OR `contact`.`self` OR `item`.`gravity` != %d OR `contact`.`uid` = 0)
 677                                 STRAIGHT_JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id` AND NOT `author`.`blocked`
 678                                 STRAIGHT_JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id` AND NOT `owner`.`blocked`
 679                                 LEFT JOIN `user-item` ON `user-item`.`iid` = $master_table_key AND `user-item`.`uid` = %d
 680                                 LEFT JOIN `user-contact` AS `user-author` ON `user-author`.`cid` = $master_table.`author-id` AND `user-author`.`uid` = %d
 681                                 LEFT JOIN `user-contact` AS `user-owner` ON `user-owner`.`cid` = $master_table.`owner-id` AND `user-owner`.`uid` = %d",
 682                                 Contact::SHARING, Contact::FRIEND, GRAVITY_PARENT, intval($uid), intval($uid), intval($uid));
 683                 } else {
 684                         if (strpos($sql_commands, "`contact`.") !== false) {
 685                                 $joins .= "LEFT JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`";
 686                         }
 687                         if (strpos($sql_commands, "`author`.") !== false) {
 688                                 $joins .= " LEFT JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id`";
 689                         }
 690                         if (strpos($sql_commands, "`owner`.") !== false) {
 691                                 $joins .= " LEFT JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id`";
 692                         }
 693                 }
 694
 695                 if (strpos($sql_commands, "`group_member`.") !== false) {
 696                         $joins .= " STRAIGHT_JOIN `group_member` ON `group_member`.`contact-id` = $master_table.`contact-id`";
 697                 }
 698
 699                 if (strpos($sql_commands, "`user`.") !== false) {
 700                         $joins .= " STRAIGHT_JOIN `user` ON `user`.`uid` = $master_table.`uid`";
 701                 }
 702
 703                 if (strpos($sql_commands, "`event`.") !== false) {
 704                         $joins .= " LEFT JOIN `event` ON `event-id` = `event`.`id`";
 705                 }
 706
 707                 if (strpos($sql_commands, "`sign`.") !== false) {
 708                         $joins .= " LEFT JOIN `sign` ON `sign`.`iid` = `item`.`id`";
 709                 }
 710
 711                 if (strpos($sql_commands, "`diaspora-interaction`.") !== false) {
 712                         $joins .= " LEFT JOIN `diaspora-interaction` ON `diaspora-interaction`.`uri-id` = `item`.`uri-id`";
 713                 }
 714
 715                 if (strpos($sql_commands, "`item-activity`.") !== false) {
 716                         $joins .= " LEFT JOIN `item-activity` ON `item-activity`.`uri-id` = `item`.`uri-id`";
 717                 }
 718
 719                 if (strpos($sql_commands, "`item-content`.") !== false) {
 720                         $joins .= " LEFT JOIN `item-content` ON `item-content`.`uri-id` = `item`.`uri-id`";
 721                 }
 722
 723                 if (strpos($sql_commands, "`item-delivery-data`.") !== false) {
 724                         $joins .= " LEFT JOIN `item-delivery-data` ON `item-delivery-data`.`iid` = `item`.`id`";
 725                 }
 726
 727                 if (strpos($sql_commands, "`permissionset`.") !== false) {
 728                         $joins .= " LEFT JOIN `permissionset` ON `permissionset`.`id` = `item`.`psid`";
 729                 }
 730
 731                 if ((strpos($sql_commands, "`parent-item`.") !== false) || (strpos($sql_commands, "`parent-author`.") !== false)) {
 732                         $joins .= " STRAIGHT_JOIN `item` AS `parent-item` ON `parent-item`.`id` = `item`.`parent`";
 733                 }
 734
 735                 if (strpos($sql_commands, "`parent-item-author`.") !== false) {
 736                         $joins .= " STRAIGHT_JOIN `contact` AS `parent-item-author` ON `parent-item-author`.`id` = `parent-item`.`author-id`";
 737                 }
 738
 739                 return $joins;
 740         }
 741
 742         /**
 743          * @brief Add the field list for the "select" functions
 744          *
 745          * @param array $fields The field definition array
 746          * @param array $selected The array with the selected fields from the "select" functions
 747          *
 748          * @return string The field list
 749          */
 750         private static function constructSelectFields($fields, $selected)
 751         {
 752                 if (!empty($selected)) {
 753                         $selected[] = 'internal-iid';
 754                         $selected[] = 'internal-iaid';
 755                         $selected[] = 'internal-icid';
 756                         $selected[] = 'internal-network';
 757                 }
 758
 759                 if (in_array('verb', $selected)) {
 760                         $selected[] = 'internal-activity';
 761                 }
 762
 763                 if (in_array('ignored', $selected)) {
 764                         $selected[] = 'internal-user-ignored';
 765                 }
 766
 767                 if (in_array('signed_text', $selected)) {
 768                         $selected[] = 'interaction';
 769                 }
 770
 771                 $legacy_fields = array_merge(ItemDeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
 772
 773                 $selection = [];
 774                 foreach ($fields as $table => $table_fields) {
 775                         foreach ($table_fields as $field => $select) {
 776                                 if (empty($selected) || in_array($select, $selected)) {
 777                                         if (self::isLegacyMode() && in_array($select, $legacy_fields)) {
 778                                                 $selection[] = "`item`.`".$select."` AS `internal-item-" . $select . "`";
 779                                         }
 780                                         if (is_int($field)) {
 781                                                 $selection[] = "`" . $table . "`.`" . $select . "`";
 782                                         } else {
 783                                                 $selection[] = "`" . $table . "`.`" . $field . "` AS `" . $select . "`";
 784                                         }
 785                                 }
 786                         }
 787                 }
 788                 return implode(", ", $selection);
 789         }
 790
 791         /**
 792          * @brief add table definition to fields in an SQL query
 793          *
 794          * @param string $query SQL query
 795          * @param array $fields The field definition array
 796          *
 797          * @return string the changed SQL query
 798          */
 799         private static function addTablesToFields($query, $fields)
 800         {
 801                 foreach ($fields as $table => $table_fields) {
 802                         foreach ($table_fields as $alias => $field) {
 803                                 if (is_int($alias)) {
 804                                         $replace_field = $field;
 805                                 } else {
 806                                         $replace_field = $alias;
 807                                 }
 808
 809                                 $search = "/([^\.])`" . $field . "`/i";
 810                                 $replace = "$1`" . $table . "`.`" . $replace_field . "`";
 811                                 $query = preg_replace($search, $replace, $query);
 812                         }
 813                 }
 814                 return $query;
 815         }
 816
 817         /**
 818          * @brief Update existing item entries
 819          *
 820          * @param array $fields    The fields that are to be changed
 821          * @param array $condition The condition for finding the item entries
 822          *
 823          * In the future we may have to change permissions as well.
 824          * Then we had to add the user id as third parameter.
 825          *
 826          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 827          *
 828          * @return integer|boolean number of affected rows - or "false" if there was an error
 829          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 830          */
 831         public static function update(array $fields, array $condition)
 832         {
 833                 if (empty($condition) || empty($fields)) {
 834                         return false;
 835                 }
 836
 837                 // To ensure the data integrity we do it in an transaction
 838                 DBA::transaction();
 839
 840                 // We cannot simply expand the condition to check for origin entries
 841                 // The condition needn't to be a simple array but could be a complex condition.
 842                 // And we have to execute this query before the update to ensure to fetch the same data.
 843                 $items = DBA::select('item', ['id', 'origin', 'uri', 'uri-id', 'iaid', 'icid', 'tag', 'file'], $condition);
 844
 845                 $content_fields = [];
 846                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
 847                         if (isset($fields[$field])) {
 848                                 $content_fields[$field] = $fields[$field];
 849                                 if (in_array($field, self::CONTENT_FIELDLIST) || !self::isLegacyMode()) {
 850                                         unset($fields[$field]);
 851                                 } else {
 852                                         $fields[$field] = null;
 853                                 }
 854                         }
 855                 }
 856
 857                 $delivery_data = ItemDeliveryData::extractFields($fields);
 858
 859                 $clear_fields = ['bookmark', 'type', 'author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link', 'postopts', 'inform'];
 860                 foreach ($clear_fields as $field) {
 861                         if (array_key_exists($field, $fields)) {
 862                                 $fields[$field] = null;
 863                         }
 864                 }
 865
 866                 if (array_key_exists('tag', $fields)) {
 867                         $tags = $fields['tag'];
 868                         $fields['tag'] = null;
 869                 } else {
 870                         $tags = null;
 871                 }
 872
 873                 if (array_key_exists('file', $fields)) {
 874                         $files = $fields['file'];
 875                         $fields['file'] = null;
 876                 } else {
 877                         $files = null;
 878                 }
 879
 880                 if (!empty($fields)) {
 881                         $success = DBA::update('item', $fields, $condition);
 882
 883                         if (!$success) {
 884                                 DBA::close($items);
 885                                 DBA::rollback();
 886                                 return false;
 887                         }
 888                 }
 889
 890                 // When there is no content for the "old" item table, this will count the fetched items
 891                 $rows = DBA::affectedRows();
 892
 893                 $notify_items = [];
 894
 895                 while ($item = DBA::fetch($items)) {
 896                         if (!empty($item['iaid']) || (!empty($content_fields['verb']) && (self::activityToIndex($content_fields['verb']) >= 0))) {
 897                                 self::updateActivity($content_fields, ['uri-id' => $item['uri-id']]);
 898
 899                                 if (empty($item['iaid'])) {
 900                                         $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-id' => $item['uri-id']]);
 901                                         if (DBA::isResult($item_activity)) {
 902                                                 $item_fields = ['iaid' => $item_activity['id'], 'icid' => null];
 903                                                 foreach (self::MIXED_CONTENT_FIELDLIST as $field) {
 904                                                         if (self::isLegacyMode()) {
 905                                                                 $item_fields[$field] = null;
 906                                                         } else {
 907                                                                 unset($item_fields[$field]);
 908                                                         }
 909                                                 }
 910                                                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 911
 912                                                 if (!empty($item['icid']) && !DBA::exists('item', ['icid' => $item['icid']])) {
 913                                                         DBA::delete('item-content', ['id' => $item['icid']]);
 914                                                 }
 915                                         }
 916                                 } elseif (!empty($item['icid'])) {
 917                                         DBA::update('item', ['icid' => null], ['id' => $item['id']]);
 918
 919                                         if (!DBA::exists('item', ['icid' => $item['icid']])) {
 920                                                 DBA::delete('item-content', ['id' => $item['icid']]);
 921                                         }
 922                                 }
 923                         } else {
 924                                 self::updateContent($content_fields, ['uri-id' => $item['uri-id']]);
 925
 926                                 if (empty($item['icid'])) {
 927                                         $item_content = DBA::selectFirst('item-content', [], ['uri-id' => $item['uri-id']]);
 928                                         if (DBA::isResult($item_content)) {
 929                                                 $item_fields = ['icid' => $item_content['id']];
 930                                                 // Clear all fields in the item table that have a content in the item-content table
 931                                                 foreach ($item_content as $field => $content) {
 932                                                         if (in_array($field, self::MIXED_CONTENT_FIELDLIST) && !empty($item_content[$field])) {
 933                                                                 if (self::isLegacyMode()) {
 934                                                                         $item_fields[$field] = null;
 935                                                                 } else {
 936                                                                         unset($item_fields[$field]);
 937                                                                 }
 938                                                         }
 939                                                 }
 940                                                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 941                                         }
 942                                 }
 943                         }
 944
 945                         if (!is_null($tags)) {
 946                                 Term::insertFromTagFieldByItemId($item['id'], $tags);
 947                                 if (!empty($item['tag'])) {
 948                                         DBA::update('item', ['tag' => ''], ['id' => $item['id']]);
 949                                 }
 950                         }
 951
 952                         if (!is_null($files)) {
 953                                 Term::insertFromFileFieldByItemId($item['id'], $files);
 954                                 if (!empty($item['file'])) {
 955                                         DBA::update('item', ['file' => ''], ['id' => $item['id']]);
 956                                 }
 957                         }
 958
 959                         ItemDeliveryData::update($item['id'], $delivery_data);
 960
 961                         self::updateThread($item['id']);
 962
 963                         // We only need to notfiy others when it is an original entry from us.
 964                         // Only call the notifier when the item has some content relevant change.
 965                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 966                                 $notify_items[] = $item['id'];
 967                         }
 968                 }
 969
 970                 DBA::close($items);
 971                 DBA::commit();
 972
 973                 foreach ($notify_items as $notify_item) {
 974                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $notify_item);
 975                 }
 976
 977                 return $rows;
 978         }
 979
 980         /**
 981          * @brief Delete an item and notify others about it - if it was ours
 982          *
 983          * @param array   $condition The condition for finding the item entries
 984          * @param integer $priority  Priority for the notification
 985          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 986          */
 987         public static function delete($condition, $priority = PRIORITY_HIGH)
 988         {
 989                 $items = self::select(['id'], $condition);
 990                 while ($item = self::fetch($items)) {
 991                         self::deleteById($item['id'], $priority);
 992                 }
 993                 DBA::close($items);
 994         }
 995
 996         /**
 997          * @brief Delete an item for an user and notify others about it - if it was ours
 998          *
 999          * @param array   $condition The condition for finding the item entries
1000          * @param integer $uid       User who wants to delete this item
1001          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1002          */
1003         public static function deleteForUser($condition, $uid)
1004         {
1005                 if ($uid == 0) {
1006                         return;
1007                 }
1008
1009                 $items = self::select(['id', 'uid'], $condition);
1010                 while ($item = self::fetch($items)) {
1011                         // "Deleting" global items just means hiding them
1012                         if ($item['uid'] == 0) {
1013                                 DBA::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
1014                         } elseif ($item['uid'] == $uid) {
1015                                 self::deleteById($item['id'], PRIORITY_HIGH);
1016                         } else {
1017                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
1018                         }
1019                 }
1020                 DBA::close($items);
1021         }
1022
1023         /**
1024          * @brief Delete an item and notify others about it - if it was ours
1025          *
1026          * @param integer $item_id  Item ID that should be delete
1027          * @param integer $priority Priority for the notification
1028          *
1029          * @return boolean success
1030          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1031          */
1032         public static function deleteById($item_id, $priority = PRIORITY_HIGH)
1033         {
1034                 // locate item to be deleted
1035                 $fields = ['id', 'uri', 'uid', 'parent', 'parent-uri', 'origin',
1036                         'deleted', 'file', 'resource-id', 'event-id', 'attach',
1037                         'verb', 'object-type', 'object', 'target', 'contact-id',
1038                         'icid', 'iaid', 'psid'];
1039                 $item = self::selectFirst($fields, ['id' => $item_id]);
1040                 if (!DBA::isResult($item)) {
1041                         Logger::log('Item with ID ' . $item_id . " hasn't been found.", Logger::DEBUG);
1042                         return false;
1043                 }
1044
1045                 if ($item['deleted']) {
1046                         Logger::log('Item with ID ' . $item_id . ' has already been deleted.', Logger::DEBUG);
1047                         return false;
1048                 }
1049
1050                 $parent = self::selectFirst(['origin'], ['id' => $item['parent']]);
1051                 if (!DBA::isResult($parent)) {
1052                         $parent = ['origin' => false];
1053                 }
1054
1055                 // clean up categories and tags so they don't end up as orphans
1056
1057                 $matches = false;
1058                 $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
1059
1060                 if ($cnt) {
1061                         foreach ($matches as $mtch) {
1062                                 FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],true);
1063                         }
1064                 }
1065
1066                 $matches = false;
1067
1068                 $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
1069
1070                 if ($cnt) {
1071                         foreach ($matches as $mtch) {
1072                                 FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],false);
1073                         }
1074                 }
1075
1076                 /*
1077                  * If item is a link to a photo resource, nuke all the associated photos
1078                  * (visitors will not have photo resources)
1079                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
1080                  * generate a resource-id and therefore aren't intimately linked to the item.
1081                  */
1082                 /// @TODO: this should first check if photo is used elsewhere
1083                 if (strlen($item['resource-id'])) {
1084                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
1085                 }
1086
1087                 // If item is a link to an event, delete the event.
1088                 if (intval($item['event-id'])) {
1089                         Event::delete($item['event-id']);
1090                 }
1091
1092                 // If item has attachments, drop them
1093                 /// @TODO: this should first check if attachment is used elsewhere
1094                 foreach (explode(",", $item['attach']) as $attach) {
1095                         preg_match("|attach/(\d+)|", $attach, $matches);
1096                         if (is_array($matches) && count($matches) > 1) {
1097                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
1098                         }
1099                 }
1100
1101                 // Delete tags that had been attached to other items
1102                 self::deleteTagsFromItem($item);
1103
1104                 // Set the item to "deleted"
1105                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
1106                 DBA::update('item', $item_fields, ['id' => $item['id']]);
1107
1108                 Term::insertFromTagFieldByItemId($item['id'], '');
1109                 Term::insertFromFileFieldByItemId($item['id'], '');
1110                 self::deleteThread($item['id'], $item['parent-uri']);
1111
1112                 if (!self::exists(["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
1113                         self::delete(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
1114                 }
1115
1116                 ItemDeliveryData::delete($item['id']);
1117
1118                 // We don't delete the item-activity here, since we need some of the data for ActivityPub
1119
1120                 if (!empty($item['icid']) && !self::exists(['icid' => $item['icid'], 'deleted' => false])) {
1121                         DBA::delete('item-content', ['id' => $item['icid']], ['cascade' => false]);
1122                 }
1123                 // When the permission set will be used in photo and events as well,
1124                 // this query here needs to be extended.
1125                 // @todo Currently deactivated. We need the permission set in the deletion process.
1126                 // This is a reminder to add the removal somewhere else.
1127                 //if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
1128                 //      DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
1129                 //}
1130
1131                 // If it's the parent of a comment thread, kill all the kids
1132                 if ($item['id'] == $item['parent']) {
1133                         self::delete(['parent' => $item['parent'], 'deleted' => false], $priority);
1134                 }
1135
1136                 // Is it our comment and/or our thread?
1137                 if ($item['origin'] || $parent['origin']) {
1138
1139                         // When we delete the original post we will delete all existing copies on the server as well
1140                         self::delete(['uri' => $item['uri'], 'deleted' => false], $priority);
1141
1142                         // send the notification upstream/downstream
1143                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, intval($item['id']));
1144                 } elseif ($item['uid'] != 0) {
1145
1146                         // When we delete just our local user copy of an item, we have to set a marker to hide it
1147                         $global_item = self::selectFirst(['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
1148                         if (DBA::isResult($global_item)) {
1149                                 DBA::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
1150                         }
1151                 }
1152
1153                 Logger::log('Item with ID ' . $item_id . " has been deleted.", Logger::DEBUG);
1154
1155                 return true;
1156         }
1157
1158         private static function deleteTagsFromItem($item)
1159         {
1160                 if (($item["verb"] != Activity::TAG) || ($item["object-type"] != Activity\ObjectType::TAGTERM)) {
1161                         return;
1162                 }
1163
1164                 $xo = XML::parseString($item["object"], false);
1165                 $xt = XML::parseString($item["target"], false);
1166
1167                 if ($xt->type != Activity\ObjectType::NOTE) {
1168                         return;
1169                 }
1170
1171                 $i = self::selectFirst(['id', 'contact-id', 'tag'], ['uri' => $xt->id, 'uid' => $item['uid']]);
1172                 if (!DBA::isResult($i)) {
1173                         return;
1174                 }
1175
1176                 // For tags, the owner cannot remove the tag on the author's copy of the post.
1177                 $owner_remove = ($item["contact-id"] == $i["contact-id"]);
1178                 $author_copy = $item["origin"];
1179
1180                 if (($owner_remove && $author_copy) || !$owner_remove) {
1181                         return;
1182                 }
1183
1184                 $tags = explode(',', $i["tag"]);
1185                 $newtags = [];
1186                 if (count($tags)) {
1187                         foreach ($tags as $tag) {
1188                                 if (trim($tag) !== trim($xo->body)) {
1189                                        $newtags[] = trim($tag);
1190                                 }
1191                         }
1192                 }
1193                 self::update(['tag' => implode(',', $newtags)], ['id' => $i["id"]]);
1194         }
1195
1196         private static function guid($item, $notify)
1197         {
1198                 if (!empty($item['guid'])) {
1199                         return Strings::escapeTags(trim($item['guid']));
1200                 }
1201
1202                 if ($notify) {
1203                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
1204                         // We add the hash of our own host because our host is the original creator of the post.
1205                         $prefix_host = \get_app()->getHostName();
1206                 } else {
1207                         $prefix_host = '';
1208
1209                         // We are only storing the post so we create a GUID from the original hostname.
1210                         if (!empty($item['author-link'])) {
1211                                 $parsed = parse_url($item['author-link']);
1212                                 if (!empty($parsed['host'])) {
1213                                         $prefix_host = $parsed['host'];
1214                                 }
1215                         }
1216
1217                         if (empty($prefix_host) && !empty($item['plink'])) {
1218                                 $parsed = parse_url($item['plink']);
1219                                 if (!empty($parsed['host'])) {
1220                                         $prefix_host = $parsed['host'];
1221                                 }
1222                         }
1223
1224                         if (empty($prefix_host) && !empty($item['uri'])) {
1225                                 $parsed = parse_url($item['uri']);
1226                                 if (!empty($parsed['host'])) {
1227                                         $prefix_host = $parsed['host'];
1228                                 }
1229                         }
1230
1231                         // Is it in the format data@host.tld? - Used for mail contacts
1232                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
1233                                 $mailparts = explode('@', $item['author-link']);
1234                                 $prefix_host = array_pop($mailparts);
1235                         }
1236                 }
1237
1238                 if (!empty($item['plink'])) {
1239                         $guid = self::guidFromUri($item['plink'], $prefix_host);
1240                 } elseif (!empty($item['uri'])) {
1241                         $guid = self::guidFromUri($item['uri'], $prefix_host);
1242                 } else {
1243                         $guid = System::createUUID(hash('crc32', $prefix_host));
1244                 }
1245
1246                 return $guid;
1247         }
1248
1249         private static function contactId($item)
1250         {
1251                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
1252                         return $item['contact-id'];
1253                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
1254                         return $item['contact-id'];
1255                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
1256                         return $item['author-id'];
1257                 } elseif (!empty($item['contact-id'])) {
1258                         return $item['contact-id'];
1259                 } else {
1260                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
1261                         if (!empty($contact_id)) {
1262                                 return $contact_id;
1263                         }
1264                 }
1265                 return $item['author-id'];
1266         }
1267
1268         // This function will finally cover most of the preparation functionality in mod/item.php
1269         public static function prepare(&$item)
1270         {
1271                 /*
1272                  * @TODO: Unused code triggering inspection errors
1273                  *
1274                 $data = BBCode::getAttachmentData($item['body']);
1275                 if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $item['body'], $match, PREG_SET_ORDER) || isset($data["type"]))
1276                         && ($posttype != Item::PT_PERSONAL_NOTE)) {
1277                         $posttype = Item::PT_PAGE;
1278                         $objecttype = ACTIVITY_OBJ_BOOKMARK;
1279                 }
1280                  */
1281         }
1282
1283         /**
1284          * Write an item array into a spool file to be inserted later.
1285          * This command is called whenever there are issues storing an item.
1286          *
1287          * @param array $item The item fields that are to be inserted
1288          * @throws \Exception
1289          */
1290         private static function spool($orig_item)
1291         {
1292                 // Now we store the data in the spool directory
1293                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
1294                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
1295
1296                 $spoolpath = get_spoolpath();
1297                 if ($spoolpath != "") {
1298                         $spool = $spoolpath . '/' . $file;
1299
1300                         file_put_contents($spool, json_encode($orig_item));
1301                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
1302                 }
1303         }
1304
1305         public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
1306         {
1307                 $orig_item = $item;
1308
1309                 $priority = PRIORITY_HIGH;
1310
1311                 // If it is a posting where users should get notifications, then define it as wall posting
1312                 if ($notify) {
1313                         $item['wall'] = 1;
1314                         $item['origin'] = 1;
1315                         $item['network'] = Protocol::DFRN;
1316                         $item['protocol'] = Conversation::PARCEL_DFRN;
1317
1318                         if (is_int($notify)) {
1319                                 $priority = $notify;
1320                         }
1321                 } else {
1322                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
1323                 }
1324
1325                 $item['guid'] = self::guid($item, $notify);
1326                 $item['uri'] = Strings::escapeTags(trim(($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid'])));
1327
1328                 // Store URI data
1329                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
1330
1331                 // Store conversation data
1332                 $item = Conversation::insert($item);
1333
1334                 /*
1335                  * If a Diaspora signature structure was passed in, pull it out of the
1336                  * item array and set it aside for later storage.
1337                  */
1338
1339                 $dsprsig = null;
1340                 if (isset($item['dsprsig'])) {
1341                         $encoded_signature = $item['dsprsig'];
1342                         $dsprsig = json_decode(base64_decode($item['dsprsig']));
1343                         unset($item['dsprsig']);
1344                 }
1345
1346                 $diaspora_signed_text = '';
1347                 if (isset($item['diaspora_signed_text'])) {
1348                         $diaspora_signed_text = $item['diaspora_signed_text'];
1349                         unset($item['diaspora_signed_text']);
1350                 }
1351
1352                 // Converting the plink
1353                 /// @TODO Check if this is really still needed
1354                 if ($item['network'] == Protocol::OSTATUS) {
1355                         if (isset($item['plink'])) {
1356                                 $item['plink'] = OStatus::convertHref($item['plink']);
1357                         } elseif (isset($item['uri'])) {
1358                                 $item['plink'] = OStatus::convertHref($item['uri']);
1359                         }
1360                 }
1361
1362                 if (!empty($item['thr-parent'])) {
1363                         $item['parent-uri'] = $item['thr-parent'];
1364                 }
1365
1366                 /** @var Activity $activity */
1367                 $activity = self::getClass(Activity::class);
1368
1369                 if (isset($item['gravity'])) {
1370                         $item['gravity'] = intval($item['gravity']);
1371                 } elseif ($item['parent-uri'] === $item['uri']) {
1372                         $item['gravity'] = GRAVITY_PARENT;
1373                 } elseif ($activity->match($item['verb'], Activity::POST)) {
1374                         $item['gravity'] = GRAVITY_COMMENT;
1375                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
1376                         $item['gravity'] = GRAVITY_ACTIVITY;
1377                 } else {
1378                         $item['gravity'] = GRAVITY_UNKNOWN;   // Should not happen
1379                         Logger::log('Unknown gravity for verb: ' . $item['verb'], Logger::DEBUG);
1380                 }
1381
1382                 $uid = intval($item['uid']);
1383
1384                 // check for create date and expire time
1385                 $expire_interval = Config::get('system', 'dbclean-expire-days', 0);
1386
1387                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $uid]);
1388                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
1389                         $expire_interval = $user['expire'];
1390                 }
1391
1392                 if (($expire_interval > 0) && !empty($item['created'])) {
1393                         $expire_date = time() - ($expire_interval * 86400);
1394                         $created_date = strtotime($item['created']);
1395                         if ($created_date < $expire_date) {
1396                                 Logger::notice('Item created before expiration interval.', [
1397                                         'created' => date('c', $created_date),
1398                                         'expired' => date('c', $expire_date),
1399                                         '$item' => $item
1400                                 ]);
1401                                 return 0;
1402                         }
1403                 }
1404
1405                 /*
1406                  * Do we already have this item?
1407                  * We have to check several networks since Friendica posts could be repeated
1408                  * via OStatus (maybe Diasporsa as well)
1409                  */
1410                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
1411                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
1412                                 trim($item['uri']), $item['uid'],
1413                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
1414                         $existing = self::selectFirst(['id', 'network'], $condition);
1415                         if (DBA::isResult($existing)) {
1416                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
1417                                 if ($uid != 0) {
1418                                         Logger::notice('Item already existed for user', [
1419                                                 'uri' => $item['uri'],
1420                                                 'uid' => $uid,
1421                                                 'network' => $item['network'],
1422                                                 'existing_id' => $existing["id"],
1423                                                 'existing_network' => $existing["network"]
1424                                         ]);
1425                                 }
1426
1427                                 return $existing["id"];
1428                         }
1429                 }
1430
1431                 $item['wall']          = intval($item['wall'] ?? 0);
1432                 $item['extid']         = trim($item['extid'] ?? '');
1433                 $item['author-name']   = trim($item['author-name'] ?? '');
1434                 $item['author-link']   = trim($item['author-link'] ?? '');
1435                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
1436                 $item['owner-name']    = trim($item['owner-name'] ?? '');
1437                 $item['owner-link']    = trim($item['owner-link'] ?? '');
1438                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
1439                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
1440                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
1441                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
1442                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
1443                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
1444                 $item['title']         = trim($item['title'] ?? '');
1445                 $item['location']      = trim($item['location'] ?? '');
1446                 $item['coord']         = trim($item['coord'] ?? '');
1447                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
1448                 $item['deleted']       = 0;
1449                 $item['parent-uri']    = trim(($item['parent-uri'] ?? '') ?: $item['uri']);
1450                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
1451                 $item['verb']          = trim($item['verb'] ?? '');
1452                 $item['object-type']   = trim($item['object-type'] ?? '');
1453                 $item['object']        = trim($item['object'] ?? '');
1454                 $item['target-type']   = trim($item['target-type'] ?? '');
1455                 $item['target']        = trim($item['target'] ?? '');
1456                 $item['plink']         = trim($item['plink'] ?? '');
1457                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
1458                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
1459                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
1460                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
1461                 $item['private']       = intval($item['private'] ?? 0);
1462                 $item['body']          = trim($item['body'] ?? '');
1463                 $item['tag']           = trim($item['tag'] ?? '');
1464                 $item['attach']        = trim($item['attach'] ?? '');
1465                 $item['app']           = trim($item['app'] ?? '');
1466                 $item['origin']        = intval($item['origin'] ?? 0);
1467                 $item['postopts']      = trim($item['postopts'] ?? '');
1468                 $item['resource-id']   = trim($item['resource-id'] ?? '');
1469                 $item['event-id']      = intval($item['event-id'] ?? 0);
1470                 $item['inform']        = trim($item['inform'] ?? '');
1471                 $item['file']          = trim($item['file'] ?? '');
1472
1473                 // When there is no content then we don't post it
1474                 if ($item['body'].$item['title'] == '') {
1475                         Logger::notice('No body, no title.');
1476                         return 0;
1477                 }
1478
1479                 self::addLanguageToItemArray($item);
1480
1481                 // Items cannot be stored before they happen ...
1482                 if ($item['created'] > DateTimeFormat::utcNow()) {
1483                         $item['created'] = DateTimeFormat::utcNow();
1484                 }
1485
1486                 // We haven't invented time travel by now.
1487                 if ($item['edited'] > DateTimeFormat::utcNow()) {
1488                         $item['edited'] = DateTimeFormat::utcNow();
1489                 }
1490
1491                 $item['plink'] = ($item['plink'] ?? '') ?: System::baseUrl() . '/display/' . urlencode($item['guid']);
1492
1493                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
1494                         'photo' => $item['author-avatar'], 'network' => $item['network']];
1495
1496                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, false, $default);
1497
1498                 if (Contact::isBlocked($item['author-id'])) {
1499                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
1500                         return 0;
1501                 }
1502
1503                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
1504                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
1505                         return 0;
1506                 }
1507
1508                 if (!empty($uid) && Contact::isBlockedByUser($item['author-id'], $uid)) {
1509                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $uid, 'item-uri' => $item['uri']]);
1510                         return 0;
1511                 }
1512
1513                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
1514                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
1515
1516                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, false, $default);
1517
1518                 if (Contact::isBlocked($item['owner-id'])) {
1519                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
1520                         return 0;
1521                 }
1522
1523                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
1524                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
1525                         return 0;
1526                 }
1527
1528                 if (!empty($uid) && Contact::isBlockedByUser($item['owner-id'], $uid)) {
1529                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $uid, 'item-uri' => $item['uri']]);
1530                         return 0;
1531                 }
1532
1533                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
1534                 if (!empty($uid) && !empty($item['causer-id']) && Contact::isBlockedByUser($item['causer-id'], $uid)) {
1535                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'], 'uid' => $uid, 'item-uri' => $item['uri']]);
1536                         return 0;
1537                 }
1538
1539                 if (!empty($uid) && !empty($item['causer-id']) && ($item['parent-uri'] == $item['uri']) && Contact::isIgnoredByUser($item['causer-id'], $uid)) {
1540                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'], 'uid' => $uid, 'item-uri' => $item['uri']]);
1541                         return 0;
1542                 }
1543
1544                 // We don't store the causer, we only have it here for the checks above
1545                 unset($item['causer-id']);
1546                 unset($item['causer-link']);
1547
1548                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
1549                 $item["contact-id"] = self::contactId($item);
1550
1551                 if ($item['network'] == Protocol::PHANTOM) {
1552                         $item['network'] = Protocol::DFRN;
1553                         Logger::notice('Missing network, setting to {network}.', [
1554                                 'uri' => $item["uri"],
1555                                 'network' => $item['network'],
1556                                 'callstack' => System::callstack()
1557                         ]);
1558                 }
1559
1560                 // Checking if there is already an item with the same guid
1561                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
1562                 if (self::exists($condition)) {
1563                         Logger::notice('Found already existing item', [
1564                                 'guid' => $item['guid'],
1565                                 'uid' => $item['uid'],
1566                                 'network' => $item['network']
1567                         ]);
1568                         return 0;
1569                 }
1570
1571                 if ($item['verb'] == Activity::FOLLOW) {
1572                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($uid))) {
1573                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
1574                                 Logger::log("Follow: Don't store not origin follow request from us for " . $item['parent-uri'], Logger::DEBUG);
1575                                 return 0;
1576                         }
1577
1578                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
1579                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
1580                         if (self::exists($condition)) {
1581                                 // It happens that we receive multiple follow requests by the same author - we only store one.
1582                                 Logger::log('Follow: Found existing follow request from author ' . $item['author-id'] . ' for ' . $item['parent-uri'], Logger::DEBUG);
1583                                 return 0;
1584                         }
1585                 }
1586
1587                 // Check for hashtags in the body and repair or add hashtag links
1588                 self::setHashtags($item);
1589
1590                 $item['thr-parent'] = $item['parent-uri'];
1591
1592                 $notify_type = Delivery::POST;
1593                 $allow_cid = '';
1594                 $allow_gid = '';
1595                 $deny_cid  = '';
1596                 $deny_gid  = '';
1597
1598                 if ($item['parent-uri'] === $item['uri']) {
1599                         $parent_id = 0;
1600                         $parent_deleted = 0;
1601                         $allow_cid = $item['allow_cid'];
1602                         $allow_gid = $item['allow_gid'];
1603                         $deny_cid  = $item['deny_cid'];
1604                         $deny_gid  = $item['deny_gid'];
1605                 } else {
1606                         // find the parent and snarf the item id and ACLs
1607                         // and anything else we need to inherit
1608
1609                         $fields = ['uri', 'parent-uri', 'id', 'deleted',
1610                                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
1611                                 'wall', 'private', 'forum_mode', 'origin'];
1612                         $condition = ['uri' => $item['parent-uri'], 'uid' => $item['uid']];
1613                         $params = ['order' => ['id' => false]];
1614                         $parent = self::selectFirst($fields, $condition, $params);
1615
1616                         if (DBA::isResult($parent)) {
1617                                 // is the new message multi-level threaded?
1618                                 // even though we don't support it now, preserve the info
1619                                 // and re-attach to the conversation parent.
1620
1621                                 if ($parent['uri'] != $parent['parent-uri']) {
1622                                         $item['parent-uri'] = $parent['parent-uri'];
1623
1624                                         $condition = ['uri' => $item['parent-uri'],
1625                                                 'parent-uri' => $item['parent-uri'],
1626                                                 'uid' => $item['uid']];
1627                                         $params = ['order' => ['id' => false]];
1628                                         $toplevel_parent = self::selectFirst($fields, $condition, $params);
1629
1630                                         if (DBA::isResult($toplevel_parent)) {
1631                                                 $parent = $toplevel_parent;
1632                                         }
1633                                 }
1634
1635                                 $parent_id      = $parent['id'];
1636                                 $parent_deleted = $parent['deleted'];
1637                                 $allow_cid      = $parent['allow_cid'];
1638                                 $allow_gid      = $parent['allow_gid'];
1639                                 $deny_cid       = $parent['deny_cid'];
1640                                 $deny_gid       = $parent['deny_gid'];
1641                                 $item['wall']   = $parent['wall'];
1642
1643                                 /*
1644                                  * If the parent is private, force privacy for the entire conversation
1645                                  * This differs from the above settings as it subtly allows comments from
1646                                  * email correspondents to be private even if the overall thread is not.
1647                                  */
1648                                 if ($parent['private']) {
1649                                         $item['private'] = $parent['private'];
1650                                 }
1651
1652                                 /*
1653                                  * Edge case. We host a public forum that was originally posted to privately.
1654                                  * The original author commented, but as this is a comment, the permissions
1655                                  * weren't fixed up so it will still show the comment as private unless we fix it here.
1656                                  */
1657                                 if ((intval($parent['forum_mode']) == 1) && $parent['private']) {
1658                                         $item['private'] = 0;
1659                                 }
1660
1661                                 // If its a post that originated here then tag the thread as "mention"
1662                                 if ($item['origin'] && $item['uid']) {
1663                                         DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
1664                                         Logger::log('tagged thread ' . $parent_id . ' as mention for user ' . $item['uid'], Logger::DEBUG);
1665                                 }
1666                         } else {
1667                                 /*
1668                                  * Allow one to see reply tweets from status.net even when
1669                                  * we don't have or can't see the original post.
1670                                  */
1671                                 if ($force_parent) {
1672                                         Logger::log('$force_parent=true, reply converted to top-level post.');
1673                                         $parent_id = 0;
1674                                         $item['parent-uri'] = $item['uri'];
1675                                         $item['gravity'] = GRAVITY_PARENT;
1676                                 } else {
1677                                         Logger::log('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
1678                                         return 0;
1679                                 }
1680
1681                                 $parent_deleted = 0;
1682                         }
1683                 }
1684
1685                 if (stristr($item['verb'], Activity::POKE)) {
1686                         $notify_type = Delivery::POKE;
1687                 }
1688
1689                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
1690                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
1691
1692                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
1693                         $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
1694                 if (self::exists($condition)) {
1695                         Logger::log('duplicated item with the same uri found. '.print_r($item,true));
1696                         return 0;
1697                 }
1698
1699                 // On Friendica and Diaspora the GUID is unique
1700                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
1701                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
1702                         if (self::exists($condition)) {
1703                                 Logger::log('duplicated item with the same guid found. '.print_r($item,true));
1704                                 return 0;
1705                         }
1706                 } elseif ($item['network'] == Protocol::OSTATUS) {
1707                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
1708                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
1709                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
1710                         if (self::exists($condition)) {
1711                                 Logger::log('duplicated item with the same body found. '.print_r($item,true));
1712                                 return 0;
1713                         }
1714                 }
1715
1716                 // Is this item available in the global items (with uid=0)?
1717                 if ($item["uid"] == 0) {
1718                         $item["global"] = true;
1719
1720                         // Set the global flag on all items if this was a global item entry
1721                         DBA::update('item', ['global' => true], ['uri' => $item["uri"]]);
1722                 } else {
1723                         $item["global"] = self::exists(['uid' => 0, 'uri' => $item["uri"]]);
1724                 }
1725
1726                 // ACL settings
1727                 if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
1728                         $private = 1;
1729                 } else {
1730                         $private = $item['private'];
1731                 }
1732
1733                 $item["allow_cid"] = $allow_cid;
1734                 $item["allow_gid"] = $allow_gid;
1735                 $item["deny_cid"] = $deny_cid;
1736                 $item["deny_gid"] = $deny_gid;
1737                 $item["private"] = $private;
1738                 $item["deleted"] = $parent_deleted;
1739
1740                 // Fill the cache field
1741                 self::putInCache($item);
1742
1743                 if ($notify) {
1744                         $item['edit'] = false;
1745                         $item['parent'] = $parent_id;
1746                         Hook::callAll('post_local', $item);
1747                         unset($item['edit']);
1748                         unset($item['parent']);
1749                 } else {
1750                         Hook::callAll('post_remote', $item);
1751                 }
1752
1753                 // This array field is used to trigger some automatic reactions
1754                 // It is mainly used in the "post_local" hook.
1755                 unset($item['api_source']);
1756
1757                 if (!empty($item['cancel'])) {
1758                         Logger::log('post cancelled by addon.');
1759                         return 0;
1760                 }
1761
1762                 /*
1763                  * Check for already added items.
1764                  * There is a timing issue here that sometimes creates double postings.
1765                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
1766                  */
1767                 if ($item["uid"] == 0) {
1768                         if (self::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
1769                                 Logger::log('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], Logger::DEBUG);
1770                                 return 0;
1771                         }
1772                 }
1773
1774                 Logger::log('' . print_r($item,true), Logger::DATA);
1775
1776                 if (array_key_exists('tag', $item)) {
1777                         $tags = $item['tag'];
1778                         unset($item['tag']);
1779                 } else {
1780                         $tags = '';
1781                 }
1782
1783                 if (array_key_exists('file', $item)) {
1784                         $files = $item['file'];
1785                         unset($item['file']);
1786                 } else {
1787                         $files = '';
1788                 }
1789
1790                 // Creates or assigns the permission set
1791                 $item['psid'] = PermissionSet::fetchIDForPost($item);
1792
1793                 // We are doing this outside of the transaction to avoid timing problems
1794                 if (!self::insertActivity($item)) {
1795                         self::insertContent($item);
1796                 }
1797
1798                 $delivery_data = ItemDeliveryData::extractFields($item);
1799
1800                 unset($item['postopts']);
1801                 unset($item['inform']);
1802
1803                 // These fields aren't stored anymore in the item table, they are fetched upon request
1804                 unset($item['author-link']);
1805                 unset($item['author-name']);
1806                 unset($item['author-avatar']);
1807                 unset($item['author-network']);
1808
1809                 unset($item['owner-link']);
1810                 unset($item['owner-name']);
1811                 unset($item['owner-avatar']);
1812
1813                 $like_no_comment = Config::get('system', 'like_no_comment');
1814
1815                 DBA::transaction();
1816                 $ret = DBA::insert('item', $item);
1817
1818                 // When the item was successfully stored we fetch the ID of the item.
1819                 if (DBA::isResult($ret)) {
1820                         $current_post = DBA::lastInsertId();
1821                 } else {
1822                         // This can happen - for example - if there are locking timeouts.
1823                         DBA::rollback();
1824
1825                         // Store the data into a spool file so that we can try again later.
1826                         self::spool($orig_item);
1827                         return 0;
1828                 }
1829
1830                 if ($current_post == 0) {
1831                         // This is one of these error messages that never should occur.
1832                         Logger::log("couldn't find created item - we better quit now.");
1833                         DBA::rollback();
1834                         return 0;
1835                 }
1836
1837                 // How much entries have we created?
1838                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
1839                 $entries = DBA::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
1840
1841                 if ($entries > 1) {
1842                         // There are duplicates. We delete our just created entry.
1843                         Logger::log('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
1844
1845                         // Yes, we could do a rollback here - but we are having many users with MyISAM.
1846                         DBA::delete('item', ['id' => $current_post]);
1847                         DBA::commit();
1848                         return 0;
1849                 } elseif ($entries == 0) {
1850                         // This really should never happen since we quit earlier if there were problems.
1851                         Logger::log("Something is terribly wrong. We haven't found our created entry.");
1852                         DBA::rollback();
1853                         return 0;
1854                 }
1855
1856                 Logger::log('created item '.$current_post);
1857
1858                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
1859                         $parent_id = $current_post;
1860                 }
1861
1862                 // Set parent id
1863                 DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1864
1865                 $item['id'] = $current_post;
1866                 $item['parent'] = $parent_id;
1867
1868                 // update the commented timestamp on the parent
1869                 // Only update "commented" if it is really a comment
1870                 if (($item['gravity'] != GRAVITY_ACTIVITY) || !$like_no_comment) {
1871                         DBA::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1872                 } else {
1873                         DBA::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1874                 }
1875
1876                 if ($dsprsig) {
1877                         /*
1878                          * Friendica servers lower than 3.4.3-2 had double encoded the signature ...
1879                          * We can check for this condition when we decode and encode the stuff again.
1880                          */
1881                         if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
1882                                 $dsprsig->signature = base64_decode($dsprsig->signature);
1883                                 Logger::log("Repaired double encoded signature from handle ".$dsprsig->signer, Logger::DEBUG);
1884                         }
1885
1886                         if (!empty($dsprsig->signed_text) && empty($dsprsig->signature) && empty($dsprsig->signer)) {
1887                                 DBA::insert('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $dsprsig->signed_text], true);
1888                         } else {
1889                                 // The other fields are used by very old Friendica servers, so we currently store them differently
1890                                 DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
1891                                         'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
1892                         }
1893                 }
1894
1895                 if (!empty($diaspora_signed_text)) {
1896                         DBA::insert('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $diaspora_signed_text], true);
1897                 }
1898
1899                 if ($item['parent-uri'] === $item['uri']) {
1900                         self::addThread($current_post);
1901                 } else {
1902                         self::updateThread($parent_id);
1903                 }
1904
1905                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1906                         ItemDeliveryData::insert($current_post, $delivery_data);
1907                 }
1908
1909                 DBA::commit();
1910
1911                 /*
1912                  * Due to deadlock issues with the "term" table we are doing these steps after the commit.
1913                  * This is not perfect - but a workable solution until we found the reason for the problem.
1914                  */
1915                 if (!empty($tags)) {
1916                         Term::insertFromTagFieldByItemId($current_post, $tags);
1917                 }
1918
1919                 if (!empty($files)) {
1920                         Term::insertFromFileFieldByItemId($current_post, $files);
1921                 }
1922
1923                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1924                 if (self::tagDeliver($item['uid'], $current_post)) {
1925                         // Get the user information for the logging
1926                         $user = User::getById($uid);
1927
1928                         Logger::notice('Item had been deleted', ['id' => $current_post, 'user' => $uid, 'account-type' => $user['account-type']]);
1929                         return 0;
1930                 }
1931
1932                 if (!$dontcache) {
1933                         $posted_item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1934                         if (DBA::isResult($posted_item)) {
1935                                 if ($notify) {
1936                                         Hook::callAll('post_local_end', $posted_item);
1937                                 } else {
1938                                         Hook::callAll('post_remote_end', $posted_item);
1939                                 }
1940                         } else {
1941                                 Logger::log('new item not found in DB, id ' . $current_post);
1942                         }
1943                 }
1944
1945                 if ($item['parent-uri'] === $item['uri']) {
1946                         self::addShadow($current_post);
1947                 } else {
1948                         self::addShadowPost($current_post);
1949                 }
1950
1951                 self::updateContact($item);
1952
1953                 check_user_notification($current_post);
1954
1955                 if ($notify || ($item['visible'] && ((!empty($parent) && $parent['origin']) || $item['origin']))) {
1956                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
1957                 }
1958
1959                 return $current_post;
1960         }
1961
1962         /**
1963          * @brief Insert a new item content entry
1964          *
1965          * @param array $item The item fields that are to be inserted
1966          * @return bool
1967          * @throws \Exception
1968          */
1969         private static function insertActivity(&$item)
1970         {
1971                 $activity_index = self::activityToIndex($item['verb']);
1972
1973                 if ($activity_index < 0) {
1974                         return false;
1975                 }
1976
1977                 $fields = ['activity' => $activity_index, 'uri-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
1978
1979                 // We just remove everything that is content
1980                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1981                         unset($item[$field]);
1982                 }
1983
1984                 // To avoid timing problems, we are using locks.
1985                 $locked = Lock::acquire('item_insert_activity');
1986                 if (!$locked) {
1987                         Logger::log("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
1988                 }
1989
1990                 // Do we already have this content?
1991                 $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-id' => $item['uri-id']]);
1992                 if (DBA::isResult($item_activity)) {
1993                         $item['iaid'] = $item_activity['id'];
1994                         Logger::log('Fetched activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
1995                 } elseif (DBA::insert('item-activity', $fields)) {
1996                         $item['iaid'] = DBA::lastInsertId();
1997                         Logger::log('Inserted activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
1998                 } else {
1999                         // This shouldn't happen.
2000                         Logger::log('Could not insert activity for URI ' . $item['uri'] . ' - should not happen');
2001                         Lock::release('item_insert_activity');
2002                         return false;
2003                 }
2004                 if ($locked) {
2005                         Lock::release('item_insert_activity');
2006                 }
2007                 return true;
2008         }
2009
2010         /**
2011          * @brief Insert a new item content entry
2012          *
2013          * @param array $item The item fields that are to be inserted
2014          * @throws \Exception
2015          */
2016         private static function insertContent(&$item)
2017         {
2018                 $fields = ['uri-plink-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
2019
2020                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
2021                         if (isset($item[$field])) {
2022                                 $fields[$field] = $item[$field];
2023                                 unset($item[$field]);
2024                         }
2025                 }
2026
2027                 // To avoid timing problems, we are using locks.
2028                 $locked = Lock::acquire('item_insert_content');
2029                 if (!$locked) {
2030                         Logger::log("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
2031                 }
2032
2033                 // Do we already have this content?
2034                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-id' => $item['uri-id']]);
2035                 if (DBA::isResult($item_content)) {
2036                         $item['icid'] = $item_content['id'];
2037                         Logger::log('Fetched content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
2038                 } elseif (DBA::insert('item-content', $fields)) {
2039                         $item['icid'] = DBA::lastInsertId();
2040                         Logger::log('Inserted content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
2041                 } else {
2042                         // This shouldn't happen.
2043                         Logger::log('Could not insert content for URI ' . $item['uri'] . ' - should not happen');
2044                 }
2045                 if ($locked) {
2046                         Lock::release('item_insert_content');
2047                 }
2048         }
2049
2050         /**
2051          * @brief Update existing item content entries
2052          *
2053          * @param array $item      The item fields that are to be changed
2054          * @param array $condition The condition for finding the item content entries
2055          * @return bool
2056          * @throws \Exception
2057          */
2058         private static function updateActivity($item, $condition)
2059         {
2060                 if (empty($item['verb'])) {
2061                         return false;
2062                 }
2063                 $activity_index = self::activityToIndex($item['verb']);
2064
2065                 if ($activity_index < 0) {
2066                         return false;
2067                 }
2068
2069                 $fields = ['activity' => $activity_index];
2070
2071                 Logger::log('Update activity for ' . json_encode($condition));
2072
2073                 DBA::update('item-activity', $fields, $condition, true);
2074
2075                 return true;
2076         }
2077
2078         /**
2079          * @brief Update existing item content entries
2080          *
2081          * @param array $item      The item fields that are to be changed
2082          * @param array $condition The condition for finding the item content entries
2083          * @throws \Exception
2084          */
2085         private static function updateContent($item, $condition)
2086         {
2087                 // We have to select only the fields from the "item-content" table
2088                 $fields = [];
2089                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
2090                         if (isset($item[$field])) {
2091                                 $fields[$field] = $item[$field];
2092                         }
2093                 }
2094
2095                 if (empty($fields)) {
2096                         // when there are no fields at all, just use the condition
2097                         // This is to ensure that we always store content.
2098                         $fields = $condition;
2099                 }
2100
2101                 Logger::log('Update content for ' . json_encode($condition));
2102
2103                 DBA::update('item-content', $fields, $condition, true);
2104         }
2105
2106         /**
2107          * @brief Distributes public items to the receivers
2108          *
2109          * @param integer $itemid      Item ID that should be added
2110          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
2111          * @throws \Exception
2112          */
2113         public static function distribute($itemid, $signed_text = '')
2114         {
2115                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
2116                 $parent = self::selectFirst(['owner-id'], $condition);
2117                 if (!DBA::isResult($parent)) {
2118                         return;
2119                 }
2120
2121                 // Only distribute public items from native networks
2122                 $condition = ['id' => $itemid, 'uid' => 0,
2123                         'network' => array_merge(Protocol::FEDERATED ,['']),
2124                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
2125                 $item = self::selectFirst(self::ITEM_FIELDLIST, $condition);
2126                 if (!DBA::isResult($item)) {
2127                         return;
2128                 }
2129
2130                 $origin = $item['origin'];
2131
2132                 unset($item['id']);
2133                 unset($item['parent']);
2134                 unset($item['mention']);
2135                 unset($item['wall']);
2136                 unset($item['origin']);
2137                 unset($item['starred']);
2138
2139                 $users = [];
2140
2141                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
2142                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
2143                 if (!DBA::isResult($owner)) {
2144                         return;
2145                 }
2146
2147                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2148                 $contacts = DBA::select('contact', ['uid'], $condition);
2149                 while ($contact = DBA::fetch($contacts)) {
2150                         if ($contact['uid'] == 0) {
2151                                 continue;
2152                         }
2153
2154                         $users[$contact['uid']] = $contact['uid'];
2155                 }
2156                 DBA::close($contacts);
2157
2158                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2159                 $contacts = DBA::select('contact', ['uid'], $condition);
2160                 while ($contact = DBA::fetch($contacts)) {
2161                         if ($contact['uid'] == 0) {
2162                                 continue;
2163                         }
2164
2165                         $users[$contact['uid']] = $contact['uid'];
2166                 }
2167                 DBA::close($contacts);
2168
2169                 if (!empty($owner['alias'])) {
2170                         $condition = ['url' => $owner['alias'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2171                         $contacts = DBA::select('contact', ['uid'], $condition);
2172                         while ($contact = DBA::fetch($contacts)) {
2173                                 if ($contact['uid'] == 0) {
2174                                         continue;
2175                                 }
2176
2177                                 $users[$contact['uid']] = $contact['uid'];
2178                         }
2179                         DBA::close($contacts);
2180                 }
2181
2182                 $origin_uid = 0;
2183
2184                 if ($item['uri'] != $item['parent-uri']) {
2185                         $parents = self::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
2186                         while ($parent = self::fetch($parents)) {
2187                                 $users[$parent['uid']] = $parent['uid'];
2188                                 if ($parent['origin'] && !$origin) {
2189                                         $origin_uid = $parent['uid'];
2190                                 }
2191                         }
2192                 }
2193
2194                 foreach ($users as $uid) {
2195                         if ($origin_uid == $uid) {
2196                                 $item['diaspora_signed_text'] = $signed_text;
2197                         }
2198                         self::storeForUser($itemid, $item, $uid);
2199                 }
2200         }
2201
2202         /**
2203          * @brief Store public items for the receivers
2204          *
2205          * @param integer $itemid Item ID that should be added
2206          * @param array   $item   The item entry that will be stored
2207          * @param integer $uid    The user that will receive the item entry
2208          * @throws \Exception
2209          */
2210         private static function storeForUser($itemid, $item, $uid)
2211         {
2212                 $item['uid'] = $uid;
2213                 $item['origin'] = 0;
2214                 $item['wall'] = 0;
2215                 if ($item['uri'] == $item['parent-uri']) {
2216                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
2217                 } else {
2218                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
2219                 }
2220
2221                 if (empty($item['contact-id'])) {
2222                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
2223                         if (!DBA::isResult($self)) {
2224                                 return;
2225                         }
2226                         $item['contact-id'] = $self['id'];
2227                 }
2228
2229                 /// @todo Handling of "event-id"
2230
2231                 $notify = false;
2232                 if ($item['uri'] == $item['parent-uri']) {
2233                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
2234                         if (DBA::isResult($contact)) {
2235                                 $notify = self::isRemoteSelf($contact, $item);
2236                         }
2237                 }
2238
2239                 $distributed = self::insert($item, false, $notify, true);
2240
2241                 if (!$distributed) {
2242                         Logger::log("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", Logger::DEBUG);
2243                 } else {
2244                         Logger::log("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, Logger::DEBUG);
2245                 }
2246         }
2247
2248         /**
2249          * @brief Add a shadow entry for a given item id that is a thread starter
2250          *
2251          * We store every public item entry additionally with the user id "0".
2252          * This is used for the community page and for the search.
2253          * It is planned that in the future we will store public item entries only once.
2254          *
2255          * @param integer $itemid Item ID that should be added
2256          * @throws \Exception
2257          */
2258         public static function addShadow($itemid)
2259         {
2260                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri'];
2261                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
2262                 $item = self::selectFirst($fields, $condition);
2263
2264                 if (!DBA::isResult($item)) {
2265                         return;
2266                 }
2267
2268                 // is it already a copy?
2269                 if (($itemid == 0) || ($item['uid'] == 0)) {
2270                         return;
2271                 }
2272
2273                 // Is it a visible public post?
2274                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || $item["private"]) {
2275                         return;
2276                 }
2277
2278                 // is it an entry from a connector? Only add an entry for natively connected networks
2279                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
2280                         return;
2281                 }
2282
2283                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2284                         return;
2285                 }
2286
2287                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2288
2289                 if (DBA::isResult($item)) {
2290                         // Preparing public shadow (removing user specific data)
2291                         $item['uid'] = 0;
2292                         unset($item['id']);
2293                         unset($item['parent']);
2294                         unset($item['wall']);
2295                         unset($item['mention']);
2296                         unset($item['origin']);
2297                         unset($item['starred']);
2298                         unset($item['postopts']);
2299                         unset($item['inform']);
2300                         if ($item['uri'] == $item['parent-uri']) {
2301                                 $item['contact-id'] = $item['owner-id'];
2302                         } else {
2303                                 $item['contact-id'] = $item['author-id'];
2304                         }
2305
2306                         $public_shadow = self::insert($item, false, false, true);
2307
2308                         Logger::log("Stored public shadow for thread ".$itemid." under id ".$public_shadow, Logger::DEBUG);
2309                 }
2310         }
2311
2312         /**
2313          * @brief Add a shadow entry for a given item id that is a comment
2314          *
2315          * This function does the same like the function above - but for comments
2316          *
2317          * @param integer $itemid Item ID that should be added
2318          * @throws \Exception
2319          */
2320         public static function addShadowPost($itemid)
2321         {
2322                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2323                 if (!DBA::isResult($item)) {
2324                         return;
2325                 }
2326
2327                 // Is it a toplevel post?
2328                 if ($item['id'] == $item['parent']) {
2329                         self::addShadow($itemid);
2330                         return;
2331                 }
2332
2333                 // Is this a shadow entry?
2334                 if ($item['uid'] == 0) {
2335                         return;
2336                 }
2337
2338                 // Is there a shadow parent?
2339                 if (!self::exists(['uri' => $item['parent-uri'], 'uid' => 0])) {
2340                         return;
2341                 }
2342
2343                 // Is there already a shadow entry?
2344                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2345                         return;
2346                 }
2347
2348                 // Save "origin" and "parent" state
2349                 $origin = $item['origin'];
2350                 $parent = $item['parent'];
2351
2352                 // Preparing public shadow (removing user specific data)
2353                 $item['uid'] = 0;
2354                 unset($item['id']);
2355                 unset($item['parent']);
2356                 unset($item['wall']);
2357                 unset($item['mention']);
2358                 unset($item['origin']);
2359                 unset($item['starred']);
2360                 unset($item['postopts']);
2361                 unset($item['inform']);
2362                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
2363
2364                 $public_shadow = self::insert($item, false, false, true);
2365
2366                 Logger::log("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, Logger::DEBUG);
2367
2368                 // If this was a comment to a Diaspora post we don't get our comment back.
2369                 // This means that we have to distribute the comment by ourselves.
2370                 if ($origin && self::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
2371                         self::distribute($public_shadow);
2372                 }
2373         }
2374
2375         /**
2376          * Adds a language specification in a "language" element of given $arr.
2377          * Expects "body" element to exist in $arr.
2378          *
2379          * @param $item
2380          * @throws \Text_LanguageDetect_Exception
2381          */
2382         private static function addLanguageToItemArray(&$item)
2383         {
2384                 $naked_body = BBCode::toPlaintext($item['body'], false);
2385
2386                 $ld = new Text_LanguageDetect();
2387                 $ld->setNameMode(2);
2388                 $languages = $ld->detect($naked_body, 3);
2389
2390                 if (is_array($languages)) {
2391                         $item['language'] = json_encode($languages);
2392                 }
2393         }
2394
2395         /**
2396          * @brief Creates an unique guid out of a given uri
2397          *
2398          * @param string $uri uri of an item entry
2399          * @param string $host hostname for the GUID prefix
2400          * @return string unique guid
2401          */
2402         public static function guidFromUri($uri, $host)
2403         {
2404                 // Our regular guid routine is using this kind of prefix as well
2405                 // We have to avoid that different routines could accidentally create the same value
2406                 $parsed = parse_url($uri);
2407
2408                 // We use a hash of the hostname as prefix for the guid
2409                 $guid_prefix = hash("crc32", $host);
2410
2411                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
2412                 unset($parsed["scheme"]);
2413
2414                 // Glue it together to be able to make a hash from it
2415                 $host_id = implode("/", $parsed);
2416
2417                 // We could use any hash algorithm since it isn't a security issue
2418                 $host_hash = hash("ripemd128", $host_id);
2419
2420                 return $guid_prefix.$host_hash;
2421         }
2422
2423         /**
2424          * generate an unique URI
2425          *
2426          * @param integer $uid  User id
2427          * @param string  $guid An existing GUID (Otherwise it will be generated)
2428          *
2429          * @return string
2430          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2431          */
2432         public static function newURI($uid, $guid = "")
2433         {
2434                 if ($guid == "") {
2435                         $guid = System::createUUID();
2436                 }
2437
2438                 return self::getApp()->getBaseURL() . '/objects/' . $guid;
2439         }
2440
2441         /**
2442          * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
2443          *
2444          * This can be used to filter for inactive contacts.
2445          * Only do this for public postings to avoid privacy problems, since poco data is public.
2446          * Don't set this value if it isn't from the owner (could be an author that we don't know)
2447          *
2448          * @param array $arr Contains the just posted item record
2449          * @throws \Exception
2450          */
2451         private static function updateContact($arr)
2452         {
2453                 // Unarchive the author
2454                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
2455                 if (DBA::isResult($contact)) {
2456                         Contact::unmarkForArchival($contact);
2457                 }
2458
2459                 // Unarchive the contact if it's not our own contact
2460                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
2461                 if (DBA::isResult($contact)) {
2462                         Contact::unmarkForArchival($contact);
2463                 }
2464
2465                 $update = (!$arr['private'] && ((($arr['author-link'] ?? '') === ($arr['owner-link'] ?? '')) || ($arr["parent-uri"] === $arr["uri"])));
2466
2467                 // Is it a forum? Then we don't care about the rules from above
2468                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri"] === $arr["uri"])) {
2469                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
2470                                 $update = true;
2471                         }
2472                 }
2473
2474                 if ($update) {
2475                         DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2476                                 ['id' => $arr['contact-id']]);
2477                 }
2478                 // Now do the same for the system wide contacts with uid=0
2479                 if (!$arr['private']) {
2480                         DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2481                                 ['id' => $arr['owner-id']]);
2482
2483                         if ($arr['owner-id'] != $arr['author-id']) {
2484                                 DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2485                                         ['id' => $arr['author-id']]);
2486                         }
2487                 }
2488         }
2489
2490         public static function setHashtags(&$item)
2491         {
2492                 $tags = BBCode::getTags($item["body"]);
2493
2494                 // No hashtags?
2495                 if (!count($tags)) {
2496                         return false;
2497                 }
2498
2499                 // What happens in [code], stays in [code]!
2500                 // escape the # and the [
2501                 // hint: we will also get in trouble with #tags, when we want markdown in posts -> ### Headline 3
2502                 $item["body"] = preg_replace_callback("/\[code(.*?)\](.*?)\[\/code\]/ism",
2503                         function ($match) {
2504                                 // we truly ESCape all # and [ to prevent gettin weird tags in [code] blocks
2505                                 $find = ['#', '['];
2506                                 $replace = [chr(27).'sharp', chr(27).'leftsquarebracket'];
2507                                 return ("[code" . $match[1] . "]" . str_replace($find, $replace, $match[2]) . "[/code]");
2508                         }, $item["body"]);
2509
2510                 // This sorting is important when there are hashtags that are part of other hashtags
2511                 // Otherwise there could be problems with hashtags like #test and #test2
2512                 rsort($tags);
2513
2514                 $URLSearchString = "^\[\]";
2515
2516                 // All hashtags should point to the home server if "local_tags" is activated
2517                 if (Config::get('system', 'local_tags')) {
2518                         $item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2519                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["body"]);
2520
2521                         $item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2522                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["tag"]);
2523                 }
2524
2525                 // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
2526                 $item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2527                         function ($match) {
2528                                 return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
2529                         }, $item["body"]);
2530
2531                 $item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
2532                         function ($match) {
2533                                 return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
2534                         }, $item["body"]);
2535
2536                 $item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
2537                         function ($match) {
2538                                 return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
2539                         }, $item["body"]);
2540
2541                 // Repair recursive urls
2542                 $item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2543                                 "&num;$2", $item["body"]);
2544
2545                 foreach ($tags as $tag) {
2546                         if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || $tag[1] == '#') {
2547                                 continue;
2548                         }
2549
2550                         $basetag = str_replace('_',' ',substr($tag,1));
2551                         $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
2552
2553                         $item["body"] = str_replace($tag, $newtag, $item["body"]);
2554
2555                         if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
2556                                 if (strlen($item["tag"])) {
2557                                         $item["tag"] = ',' . $item["tag"];
2558                                 }
2559                                 $item["tag"] = $newtag . $item["tag"];
2560                         }
2561                 }
2562
2563                 // Convert back the masked hashtags
2564                 $item["body"] = str_replace("&num;", "#", $item["body"]);
2565
2566                 // Remember! What happens in [code], stays in [code]
2567                 // roleback the # and [
2568                 $item["body"] = preg_replace_callback("/\[code(.*?)\](.*?)\[\/code\]/ism",
2569                         function ($match) {
2570                                 // we truly unESCape all sharp and leftsquarebracket
2571                                 $find = [chr(27).'sharp', chr(27).'leftsquarebracket'];
2572                                 $replace = ['#', '['];
2573                                 return ("[code" . $match[1] . "]" . str_replace($find, $replace, $match[2]) . "[/code]");
2574                         }, $item["body"]);
2575         }
2576
2577         /**
2578          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
2579          *
2580          * @param int $uid
2581          * @param int $item_id
2582          * @return boolean true if item was deleted, else false
2583          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2584          * @throws \ImagickException
2585          */
2586         private static function tagDeliver($uid, $item_id)
2587         {
2588                 $mention = false;
2589
2590                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
2591                 if (!DBA::isResult($user)) {
2592                         return false;
2593                 }
2594
2595                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
2596                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
2597
2598                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2599                 if (!DBA::isResult($item)) {
2600                         return false;
2601                 }
2602
2603                 $link = Strings::normaliseLink(System::baseUrl() . '/profile/' . $user['nickname']);
2604
2605                 /*
2606                  * Diaspora uses their own hardwired link URL in @-tags
2607                  * instead of the one we supply with webfinger
2608                  */
2609                 $dlink = Strings::normaliseLink(System::baseUrl() . '/u/' . $user['nickname']);
2610
2611                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2612                 if ($cnt) {
2613                         foreach ($matches as $mtch) {
2614                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2615                                         $mention = true;
2616                                         Logger::log('mention found: ' . $mtch[2]);
2617                                 }
2618                         }
2619                 }
2620
2621                 if (!$mention) {
2622                         if (($community_page || $prvgroup) &&
2623                                   !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
2624                                 // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
2625                                 // delete it!
2626                                 Logger::log("no-mention top-level post to community or private group. delete.");
2627                                 DBA::delete('item', ['id' => $item_id]);
2628                                 return true;
2629                         }
2630                         return false;
2631                 }
2632
2633                 $arr = ['item' => $item, 'user' => $user];
2634
2635                 Hook::callAll('tagged', $arr);
2636
2637                 if (!$community_page && !$prvgroup) {
2638                         return false;
2639                 }
2640
2641                 /*
2642                  * tgroup delivery - setup a second delivery chain
2643                  * prevent delivery looping - only proceed
2644                  * if the message originated elsewhere and is a top-level post
2645                  */
2646                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2647                         return false;
2648                 }
2649
2650                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2651                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2652                 if (!DBA::isResult($self)) {
2653                         return false;
2654                 }
2655
2656                 $owner_id = Contact::getIdForURL($self['url']);
2657
2658                 // also reset all the privacy bits to the forum default permissions
2659
2660                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
2661
2662                 $psid = PermissionSet::fetchIDForPost($user);
2663
2664                 $forum_mode = ($prvgroup ? 2 : 1);
2665
2666                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2667                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2668                 self::update($fields, ['id' => $item_id]);
2669
2670                 self::updateThread($item_id);
2671
2672                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, $item_id);
2673
2674                 return false;
2675         }
2676
2677         public static function isRemoteSelf($contact, &$datarray)
2678         {
2679                 $a = \get_app();
2680
2681                 if (!$contact['remote_self']) {
2682                         return false;
2683                 }
2684
2685                 // Prevent the forwarding of posts that are forwarded
2686                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2687                         Logger::log('Already forwarded', Logger::DEBUG);
2688                         return false;
2689                 }
2690
2691                 // Prevent to forward already forwarded posts
2692                 if ($datarray["app"] == $a->getHostName()) {
2693                         Logger::log('Already forwarded (second test)', Logger::DEBUG);
2694                         return false;
2695                 }
2696
2697                 // Only forward posts
2698                 if ($datarray["verb"] != Activity::POST) {
2699                         Logger::log('No post', Logger::DEBUG);
2700                         return false;
2701                 }
2702
2703                 if (($contact['network'] != Protocol::FEED) && $datarray['private']) {
2704                         Logger::log('Not public', Logger::DEBUG);
2705                         return false;
2706                 }
2707
2708                 $datarray2 = $datarray;
2709                 Logger::log('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), Logger::DEBUG);
2710                 if ($contact['remote_self'] == 2) {
2711                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2712                                         ['uid' => $contact['uid'], 'self' => true]);
2713                         if (DBA::isResult($self)) {
2714                                 $datarray['contact-id'] = $self["id"];
2715
2716                                 $datarray['owner-name'] = $self["name"];
2717                                 $datarray['owner-link'] = $self["url"];
2718                                 $datarray['owner-avatar'] = $self["thumb"];
2719
2720                                 $datarray['author-name']   = $datarray['owner-name'];
2721                                 $datarray['author-link']   = $datarray['owner-link'];
2722                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2723
2724                                 unset($datarray['edited']);
2725
2726                                 unset($datarray['network']);
2727                                 unset($datarray['owner-id']);
2728                                 unset($datarray['author-id']);
2729                         }
2730
2731                         if ($contact['network'] != Protocol::FEED) {
2732                                 $datarray["guid"] = System::createUUID();
2733                                 unset($datarray["plink"]);
2734                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2735                                 $datarray["parent-uri"] = $datarray["uri"];
2736                                 $datarray["thr-parent"] = $datarray["uri"];
2737                                 $datarray["extid"] = Protocol::DFRN;
2738                                 $urlpart = parse_url($datarray2['author-link']);
2739                                 $datarray["app"] = $urlpart["host"];
2740                         } else {
2741                                 $datarray['private'] = 0;
2742                         }
2743                 }
2744
2745                 if ($contact['network'] != Protocol::FEED) {
2746                         // Store the original post
2747                         $result = self::insert($datarray2, false, false);
2748                         Logger::log('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), Logger::DEBUG);
2749                 } else {
2750                         $datarray["app"] = "Feed";
2751                         $result = true;
2752                 }
2753
2754                 // Trigger automatic reactions for addons
2755                 $datarray['api_source'] = true;
2756
2757                 // We have to tell the hooks who we are - this really should be improved
2758                 $_SESSION["authenticated"] = true;
2759                 $_SESSION["uid"] = $contact['uid'];
2760
2761                 return $result;
2762         }
2763
2764         /**
2765          *
2766          * @param string $s
2767          * @param int    $uid
2768          * @param array  $item
2769          * @param int    $cid
2770          * @return string
2771          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2772          * @throws \ImagickException
2773          */
2774         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2775         {
2776                 if (Config::get('system', 'disable_embedded')) {
2777                         return $s;
2778                 }
2779
2780                 Logger::log('check for photos', Logger::DEBUG);
2781                 $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
2782
2783                 $orig_body = $s;
2784                 $new_body = '';
2785
2786                 $img_start = strpos($orig_body, '[img');
2787                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2788                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2789
2790                 while (($img_st_close !== false) && ($img_len !== false)) {
2791                         $img_st_close++; // make it point to AFTER the closing bracket
2792                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2793
2794                         Logger::log('found photo ' . $image, Logger::DEBUG);
2795
2796                         if (stristr($image, $site . '/photo/')) {
2797                                 // Only embed locally hosted photos
2798                                 $replace = false;
2799                                 $i = basename($image);
2800                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2801                                 $x = strpos($i, '-');
2802
2803                                 if ($x) {
2804                                         $res = substr($i, $x + 1);
2805                                         $i = substr($i, 0, $x);
2806                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2807                                         if (DBA::isResult($photo)) {
2808                                                 /*
2809                                                  * Check to see if we should replace this photo link with an embedded image
2810                                                  * 1. No need to do so if the photo is public
2811                                                  * 2. If there's a contact-id provided, see if they're in the access list
2812                                                  *    for the photo. If so, embed it.
2813                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2814                                                  *    permissions, regardless of order but first check to see if they're an exact
2815                                                  *    match to save some processing overhead.
2816                                                  */
2817                                                 if (self::hasPermissions($photo)) {
2818                                                         if ($cid) {
2819                                                                 $recips = self::enumeratePermissions($photo);
2820                                                                 if (in_array($cid, $recips)) {
2821                                                                         $replace = true;
2822                                                                 }
2823                                                         } elseif ($item) {
2824                                                                 if (self::samePermissions($uid, $item, $photo)) {
2825                                                                         $replace = true;
2826                                                                 }
2827                                                         }
2828                                                 }
2829                                                 if ($replace) {
2830                                                         $photo_img = Photo::getImageForPhoto($photo);
2831                                                         // If a custom width and height were specified, apply before embedding
2832                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2833                                                                 Logger::log('scaling photo', Logger::DEBUG);
2834
2835                                                                 $width = intval($match[1]);
2836                                                                 $height = intval($match[2]);
2837
2838                                                                 $photo_img->scaleDown(max($width, $height));
2839                                                         }
2840
2841                                                         $data = $photo_img->asString();
2842                                                         $type = $photo_img->getType();
2843
2844                                                         Logger::log('replacing photo', Logger::DEBUG);
2845                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2846                                                         Logger::log('replaced: ' . $image, Logger::DATA);
2847                                                 }
2848                                         }
2849                                 }
2850                         }
2851
2852                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2853                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2854                         if ($orig_body === false) {
2855                                 $orig_body = '';
2856                         }
2857
2858                         $img_start = strpos($orig_body, '[img');
2859                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2860                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2861                 }
2862
2863                 $new_body = $new_body . $orig_body;
2864
2865                 return $new_body;
2866         }
2867
2868         private static function hasPermissions($obj)
2869         {
2870                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2871                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2872         }
2873
2874         private static function samePermissions($uid, $obj1, $obj2)
2875         {
2876                 // first part is easy. Check that these are exactly the same.
2877                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2878                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2879                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2880                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2881                         return true;
2882                 }
2883
2884                 // This is harder. Parse all the permissions and compare the resulting set.
2885                 $recipients1 = self::enumeratePermissions($obj1);
2886                 $recipients2 = self::enumeratePermissions($obj2);
2887                 sort($recipients1);
2888                 sort($recipients2);
2889
2890                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2891                 return ($recipients1 == $recipients2);
2892         }
2893
2894         /**
2895          * Returns an array of contact-ids that are allowed to see this object
2896          *
2897          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2898          * @param bool  $check_dead Prunes unavailable contacts from the result
2899          * @return array
2900          * @throws \Exception
2901          */
2902         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2903         {
2904                 /** @var ACLFormatter $aclFormater */
2905                 $aclFormater = self::getClass(ACLFormatter::class);
2906
2907                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2908                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2909                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2910                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2911                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2912                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2913                 $recipients   = array_diff($recipients, $deny);
2914                 return $recipients;
2915         }
2916
2917         public static function getFeedTags($item)
2918         {
2919                 $ret = [];
2920                 $matches = false;
2921                 $cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2922                 if ($cnt) {
2923                         for ($x = 0; $x < $cnt; $x ++) {
2924                                 if ($matches[1][$x]) {
2925                                         $ret[$matches[2][$x]] = ['#', $matches[1][$x], $matches[2][$x]];
2926                                 }
2927                         }
2928                 }
2929                 $matches = false;
2930                 $cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2931                 if ($cnt) {
2932                         for ($x = 0; $x < $cnt; $x ++) {
2933                                 if ($matches[1][$x]) {
2934                                         $ret[] = ['@', $matches[1][$x], $matches[2][$x]];
2935                                 }
2936                         }
2937                 }
2938                 return $ret;
2939         }
2940
2941         public static function expire($uid, $days, $network = "", $force = false)
2942         {
2943                 if (!$uid || ($days < 1)) {
2944                         return;
2945                 }
2946
2947                 $condition = ["`uid` = ? AND NOT `deleted` AND `id` = `parent` AND `gravity` = ?",
2948                         $uid, GRAVITY_PARENT];
2949
2950                 /*
2951                  * $expire_network_only = save your own wall posts
2952                  * and just expire conversations started by others
2953                  */
2954                 $expire_network_only = PConfig::get($uid, 'expire', 'network_only', false);
2955
2956                 if ($expire_network_only) {
2957                         $condition[0] .= " AND NOT `wall`";
2958                 }
2959
2960                 if ($network != "") {
2961                         $condition[0] .= " AND `network` = ?";
2962                         $condition[] = $network;
2963                 }
2964
2965                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2966                 $condition[] = $days;
2967
2968                 $items = self::select(['file', 'resource-id', 'starred', 'type', 'id', 'post-type'], $condition);
2969
2970                 if (!DBA::isResult($items)) {
2971                         return;
2972                 }
2973
2974                 $expire_items = PConfig::get($uid, 'expire', 'items', true);
2975
2976                 // Forcing expiring of items - but not notes and marked items
2977                 if ($force) {
2978                         $expire_items = true;
2979                 }
2980
2981                 $expire_notes = PConfig::get($uid, 'expire', 'notes', true);
2982                 $expire_starred = PConfig::get($uid, 'expire', 'starred', true);
2983                 $expire_photos = PConfig::get($uid, 'expire', 'photos', false);
2984
2985                 $expired = 0;
2986
2987                 while ($item = Item::fetch($items)) {
2988                         // don't expire filed items
2989
2990                         if (strpos($item['file'], '[') !== false) {
2991                                 continue;
2992                         }
2993
2994                         // Only expire posts, not photos and photo comments
2995
2996                         if (!$expire_photos && strlen($item['resource-id'])) {
2997                                 continue;
2998                         } elseif (!$expire_starred && intval($item['starred'])) {
2999                                 continue;
3000                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == Item::PT_PERSONAL_NOTE))) {
3001                                 continue;
3002                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != Item::PT_PERSONAL_NOTE)) {
3003                                 continue;
3004                         }
3005
3006                         self::deleteById($item['id'], PRIORITY_LOW);
3007
3008                         ++$expired;
3009                 }
3010                 DBA::close($items);
3011                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
3012         }
3013
3014         public static function firstPostDate($uid, $wall = false)
3015         {
3016                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
3017                 $params = ['order' => ['received' => false]];
3018                 $thread = DBA::selectFirst('thread', ['received'], $condition, $params);
3019                 if (DBA::isResult($thread)) {
3020                         return substr(DateTimeFormat::local($thread['received']), 0, 10);
3021                 }
3022                 return false;
3023         }
3024
3025         /**
3026          * @brief add/remove activity to an item
3027          *
3028          * Toggle activities as like,dislike,attend of an item
3029          *
3030          * @param string $item_id
3031          * @param string $verb
3032          *            Activity verb. One of
3033          *            like, unlike, dislike, undislike, attendyes, unattendyes,
3034          *            attendno, unattendno, attendmaybe, unattendmaybe
3035          * @return bool
3036          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3037          * @throws \ImagickException
3038          * @hook  'post_local_end'
3039          *            array $arr
3040          *            'post_id' => ID of posted item
3041          */
3042         public static function performLike($item_id, $verb)
3043         {
3044                 if (!Session::isAuthenticated()) {
3045                         return false;
3046                 }
3047
3048                 switch ($verb) {
3049                         case 'like':
3050                         case 'unlike':
3051                                 $activity = Activity::LIKE;
3052                                 break;
3053                         case 'dislike':
3054                         case 'undislike':
3055                                 $activity = Activity::DISLIKE;
3056                                 break;
3057                         case 'attendyes':
3058                         case 'unattendyes':
3059                                 $activity = Activity::ATTEND;
3060                                 break;
3061                         case 'attendno':
3062                         case 'unattendno':
3063                                 $activity = Activity::ATTENDNO;
3064                                 break;
3065                         case 'attendmaybe':
3066                         case 'unattendmaybe':
3067                                 $activity = Activity::ATTENDMAYBE;
3068                                 break;
3069                         default:
3070                                 Logger::log('like: unknown verb ' . $verb . ' for item ' . $item_id);
3071                                 return false;
3072                 }
3073
3074                 // Enable activity toggling instead of on/off
3075                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
3076
3077                 Logger::log('like: verb ' . $verb . ' item ' . $item_id);
3078
3079                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
3080                 if (!DBA::isResult($item)) {
3081                         Logger::log('like: unknown item ' . $item_id);
3082                         return false;
3083                 }
3084
3085                 $item_uri = $item['uri'];
3086
3087                 $uid = $item['uid'];
3088                 if (($uid == 0) && local_user()) {
3089                         $uid = local_user();
3090                 }
3091
3092                 if (!Security::canWriteToUserWall($uid)) {
3093                         Logger::log('like: unable to write on wall ' . $uid);
3094                         return false;
3095                 }
3096
3097                 // Retrieves the local post owner
3098                 $owner_self_contact = DBA::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
3099                 if (!DBA::isResult($owner_self_contact)) {
3100                         Logger::log('like: unknown owner ' . $uid);
3101                         return false;
3102                 }
3103
3104                 // Retrieve the current logged in user's public contact
3105                 $author_id = public_contact();
3106
3107                 $author_contact = DBA::selectFirst('contact', ['url'], ['id' => $author_id]);
3108                 if (!DBA::isResult($author_contact)) {
3109                         Logger::log('like: unknown author ' . $author_id);
3110                         return false;
3111                 }
3112
3113                 // Contact-id is the uid-dependant author contact
3114                 if (local_user() == $uid) {
3115                         $item_contact_id = $owner_self_contact['id'];
3116                 } else {
3117                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
3118                         $item_contact = DBA::selectFirst('contact', [], ['id' => $item_contact_id]);
3119                         if (!DBA::isResult($item_contact)) {
3120                                 Logger::log('like: unknown item contact ' . $item_contact_id);
3121                                 return false;
3122                         }
3123                 }
3124
3125                 // Look for an existing verb row
3126                 // event participation are essentially radio toggles. If you make a subsequent choice,
3127                 // we need to eradicate your first choice.
3128                 if ($event_verb_flag) {
3129                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
3130
3131                         // Translate to the index based activity index
3132                         $activities = [];
3133                         foreach ($verbs as $verb) {
3134                                 $activities[] = self::activityToIndex($verb);
3135                         }
3136                 } else {
3137                         $activities = self::activityToIndex($activity);
3138                 }
3139
3140                 $condition = ['activity' => $activities, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
3141                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent' => $item_uri];
3142
3143                 $like_item = self::selectFirst(['id', 'guid', 'verb'], $condition);
3144
3145                 // If it exists, mark it as deleted
3146                 if (DBA::isResult($like_item)) {
3147                         self::deleteById($like_item['id']);
3148
3149                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
3150                                 return true;
3151                         }
3152                 }
3153
3154                 // Verb is "un-something", just trying to delete existing entries
3155                 if (strpos($verb, 'un') === 0) {
3156                         return true;
3157                 }
3158
3159                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
3160
3161                 $new_item = [
3162                         'guid'          => System::createUUID(),
3163                         'uri'           => self::newURI($item['uid']),
3164                         'uid'           => $item['uid'],
3165                         'contact-id'    => $item_contact_id,
3166                         'wall'          => $item['wall'],
3167                         'origin'        => 1,
3168                         'network'       => Protocol::DFRN,
3169                         'gravity'       => GRAVITY_ACTIVITY,
3170                         'parent'        => $item['id'],
3171                         'parent-uri'    => $item['uri'],
3172                         'thr-parent'    => $item['uri'],
3173                         'owner-id'      => $author_id,
3174                         'author-id'     => $author_id,
3175                         'body'          => $activity,
3176                         'verb'          => $activity,
3177                         'object-type'   => $objtype,
3178                         'allow_cid'     => $item['allow_cid'],
3179                         'allow_gid'     => $item['allow_gid'],
3180                         'deny_cid'      => $item['deny_cid'],
3181                         'deny_gid'      => $item['deny_gid'],
3182                         'visible'       => 1,
3183                         'unseen'        => 1,
3184                 ];
3185
3186                 $signed = Diaspora::createLikeSignature($uid, $new_item);
3187                 if (!empty($signed)) {
3188                         $new_item['diaspora_signed_text'] = json_encode($signed);
3189                 }
3190
3191                 $new_item_id = self::insert($new_item);
3192
3193                 // If the parent item isn't visible then set it to visible
3194                 if (!$item['visible']) {
3195                         self::update(['visible' => true], ['id' => $item['id']]);
3196                 }
3197
3198                 $new_item['id'] = $new_item_id;
3199
3200                 Hook::callAll('post_local_end', $new_item);
3201
3202                 return true;
3203         }
3204
3205         private static function addThread($itemid, $onlyshadow = false)
3206         {
3207                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
3208                         'moderated', 'visible', 'starred', 'contact-id', 'post-type',
3209                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
3210                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3211                 $item = self::selectFirst($fields, $condition);
3212
3213                 if (!DBA::isResult($item)) {
3214                         return;
3215                 }
3216
3217                 $item['iid'] = $itemid;
3218
3219                 if (!$onlyshadow) {
3220                         $result = DBA::insert('thread', $item);
3221
3222                         Logger::log("Add thread for item ".$itemid." - ".print_r($result, true), Logger::DEBUG);
3223                 }
3224         }
3225
3226         private static function updateThread($itemid, $setmention = false)
3227         {
3228                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
3229                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id',
3230                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
3231                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3232
3233                 $item = self::selectFirst($fields, $condition);
3234                 if (!DBA::isResult($item)) {
3235                         return;
3236                 }
3237
3238                 if ($setmention) {
3239                         $item["mention"] = 1;
3240                 }
3241
3242                 $fields = [];
3243
3244                 foreach ($item as $field => $data) {
3245                         if (!in_array($field, ["guid"])) {
3246                                 $fields[$field] = $data;
3247                         }
3248                 }
3249
3250                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
3251
3252                 Logger::log("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, Logger::DEBUG);
3253         }
3254
3255         private static function deleteThread($itemid, $itemuri = "")
3256         {
3257                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
3258                 if (!DBA::isResult($item)) {
3259                         Logger::log('No thread found for id '.$itemid, Logger::DEBUG);
3260                         return;
3261                 }
3262
3263                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
3264
3265                 Logger::log("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), Logger::DEBUG);
3266
3267                 if ($itemuri != "") {
3268                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
3269                         if (!self::exists($condition)) {
3270                                 DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
3271                                 Logger::log("deleteThread: Deleted shadow for item ".$itemuri, Logger::DEBUG);
3272                         }
3273                 }
3274         }
3275
3276         public static function getPermissionsSQLByUserId($owner_id)
3277         {
3278                 $local_user = local_user();
3279                 $remote_user = Session::getRemoteContactID($owner_id);
3280
3281                 /*
3282                  * Construct permissions
3283                  *
3284                  * default permissions - anonymous user
3285                  */
3286                 $sql = " AND NOT `item`.`private`";
3287
3288                 // Profile owner - everything is visible
3289                 if ($local_user && ($local_user == $owner_id)) {
3290                         $sql = '';
3291                 } elseif ($remote_user) {
3292                         /*
3293                          * Authenticated visitor. Unless pre-verified,
3294                          * check that the contact belongs to this $owner_id
3295                          * and load the groups the visitor belongs to.
3296                          * If pre-verified, the caller is expected to have already
3297                          * done this and passed the groups into this function.
3298                          */
3299                         $set = PermissionSet::get($owner_id, $remote_user);
3300
3301                         if (!empty($set)) {
3302                                 $sql_set = " OR (`item`.`private` IN (1,2) AND `item`.`wall` AND `item`.`psid` IN (" . implode(',', $set) . "))";
3303                         } else {
3304                                 $sql_set = '';
3305                         }
3306
3307                         $sql = " AND (NOT `item`.`private`" . $sql_set . ")";
3308                 }
3309
3310                 return $sql;
3311         }
3312
3313         /**
3314          * get translated item type
3315          *
3316          * @param $item
3317          * @return string
3318          */
3319         public static function postType($item)
3320         {
3321                 if (!empty($item['event-id'])) {
3322                         return L10n::t('event');
3323                 } elseif (!empty($item['resource-id'])) {
3324                         return L10n::t('photo');
3325                 } elseif (!empty($item['verb']) && $item['verb'] !== Activity::POST) {
3326                         return L10n::t('activity');
3327                 } elseif ($item['id'] != $item['parent']) {
3328                         return L10n::t('comment');
3329                 }
3330
3331                 return L10n::t('post');
3332         }
3333
3334         /**
3335          * Sets the "rendered-html" field of the provided item
3336          *
3337          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
3338          *
3339          * @param array $item
3340          * @param bool  $update
3341          *
3342          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3343          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
3344          */
3345         public static function putInCache(&$item, $update = false)
3346         {
3347                 $body = $item["body"];
3348
3349                 $rendered_hash = $item['rendered-hash'] ?? '';
3350                 $rendered_html = $item['rendered-html'] ?? '';
3351
3352                 if ($rendered_hash == ''
3353                         || $rendered_html == ""
3354                         || $rendered_hash != hash("md5", $item["body"])
3355                         || Config::get("system", "ignore_cache")
3356                 ) {
3357                         self::addRedirToImageTags($item);
3358
3359                         $item["rendered-html"] = BBCode::convert($item["body"]);
3360                         $item["rendered-hash"] = hash("md5", $item["body"]);
3361
3362                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
3363                         Hook::callAll('put_item_in_cache', $hook_data);
3364                         $item['rendered-html'] = $hook_data['rendered-html'];
3365                         $item['rendered-hash'] = $hook_data['rendered-hash'];
3366                         unset($hook_data);
3367
3368                         // Force an update if the generated values differ from the existing ones
3369                         if ($rendered_hash != $item["rendered-hash"]) {
3370                                 $update = true;
3371                         }
3372
3373                         // Only compare the HTML when we forcefully ignore the cache
3374                         if (Config::get("system", "ignore_cache") && ($rendered_html != $item["rendered-html"])) {
3375                                 $update = true;
3376                         }
3377
3378                         if ($update && !empty($item["id"])) {
3379                                 self::update(
3380                                         [
3381                                                 'rendered-html' => $item["rendered-html"],
3382                                                 'rendered-hash' => $item["rendered-hash"]
3383                                         ],
3384                                         ['id' => $item["id"]]
3385                                 );
3386                         }
3387                 }
3388
3389                 $item["body"] = $body;
3390         }
3391
3392         /**
3393          * @brief Find any non-embedded images in private items and add redir links to them
3394          *
3395          * @param array &$item The field array of an item row
3396          */
3397         private static function addRedirToImageTags(array &$item)
3398         {
3399                 $app = self::getApp();
3400
3401                 $matches = [];
3402                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
3403                 if ($cnt) {
3404                         foreach ($matches as $mtch) {
3405                                 if (strpos($mtch[1], '/redir') !== false) {
3406                                         continue;
3407                                 }
3408
3409                                 if ((local_user() == $item['uid']) && ($item['private'] == 1) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
3410                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
3411                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
3412                                 }
3413                         }
3414                 }
3415         }
3416
3417         /**
3418          * @brief Given an item array, convert the body element from bbcode to html and add smilie icons.
3419          * If attach is true, also add icons for item attachments.
3420          *
3421          * @param array   $item
3422          * @param boolean $attach
3423          * @param boolean $is_preview
3424          * @return string item body html
3425          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3426          * @throws \ImagickException
3427          * @hook  prepare_body_init item array before any work
3428          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
3429          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
3430          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
3431          */
3432         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
3433         {
3434                 $a = self::getApp();
3435                 Hook::callAll('prepare_body_init', $item);
3436
3437                 // In order to provide theme developers more possibilities, event items
3438                 // are treated differently.
3439                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
3440                         $ev = Event::getItemHTML($item);
3441                         return $ev;
3442                 }
3443
3444                 $tags = Term::populateTagsFromItem($item);
3445
3446                 $item['tags'] = $tags['tags'];
3447                 $item['hashtags'] = $tags['hashtags'];
3448                 $item['mentions'] = $tags['mentions'];
3449
3450                 // Compile eventual content filter reasons
3451                 $filter_reasons = [];
3452                 if (!$is_preview && public_contact() != $item['author-id']) {
3453                         if (!empty($item['content-warning']) && (!local_user() || !PConfig::get(local_user(), 'system', 'disable_cw', false))) {
3454                                 $filter_reasons[] = L10n::t('Content warning: %s', $item['content-warning']);
3455                         }
3456
3457                         $hook_data = [
3458                                 'item' => $item,
3459                                 'filter_reasons' => $filter_reasons
3460                         ];
3461                         Hook::callAll('prepare_body_content_filter', $hook_data);
3462                         $filter_reasons = $hook_data['filter_reasons'];
3463                         unset($hook_data);
3464                 }
3465
3466                 // Update the cached values if there is no "zrl=..." on the links.
3467                 $update = (!Session::isAuthenticated() && ($item["uid"] == 0));
3468
3469                 // Or update it if the current viewer is the intented viewer.
3470                 if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
3471                         $update = true;
3472                 }
3473
3474                 self::putInCache($item, $update);
3475                 $s = $item["rendered-html"];
3476
3477                 $hook_data = [
3478                         'item' => $item,
3479                         'html' => $s,
3480                         'preview' => $is_preview,
3481                         'filter_reasons' => $filter_reasons
3482                 ];
3483                 Hook::callAll('prepare_body', $hook_data);
3484                 $s = $hook_data['html'];
3485                 unset($hook_data);
3486
3487                 if (!$attach) {
3488                         // Replace the blockquotes with quotes that are used in mails.
3489                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
3490                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
3491                         return $s;
3492                 }
3493
3494                 $as = '';
3495                 $vhead = false;
3496                 $matches = [];
3497                 preg_match_all('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\"(?: title=\"(.*?)\")?|', $item['attach'], $matches, PREG_SET_ORDER);
3498                 foreach ($matches as $mtch) {
3499                         $mime = $mtch[3];
3500
3501                         $the_url = Contact::magicLinkById($item['author-id'], $mtch[1]);
3502
3503                         if (strpos($mime, 'video') !== false) {
3504                                 if (!$vhead) {
3505                                         $vhead = true;
3506                                         $a->page['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
3507                                 }
3508
3509                                 $url_parts = explode('/', $the_url);
3510                                 $id = end($url_parts);
3511                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
3512                                         '$video' => [
3513                                                 'id'     => $id,
3514                                                 'title'  => L10n::t('View Video'),
3515                                                 'src'    => $the_url,
3516                                                 'mime'   => $mime,
3517                                         ],
3518                                 ]);
3519                         }
3520
3521                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
3522                         if ($filetype) {
3523                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
3524                                 $filesubtype = str_replace('.', '-', $filesubtype);
3525                         } else {
3526                                 $filetype = 'unkn';
3527                                 $filesubtype = 'unkn';
3528                         }
3529
3530                         $title = Strings::escapeHtml(trim(($mtch[4] ?? '') ?: $mtch[1]));
3531                         $title .= ' ' . $mtch[2] . ' ' . L10n::t('bytes');
3532
3533                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
3534                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" >' . $icon . '</a>';
3535                 }
3536
3537                 if ($as != '') {
3538                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
3539                 }
3540
3541                 // Map.
3542                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
3543                         $x = Map::byCoordinates(trim($item['coord']));
3544                         if ($x) {
3545                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
3546                         }
3547                 }
3548
3549                 // Replace friendica image url size with theme preference.
3550                 if (!empty($a->theme_info['item_image_size'])) {
3551                         $ps = $a->theme_info['item_image_size'];
3552                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
3553                 }
3554
3555                 $s = HTML::applyContentFilter($s, $filter_reasons);
3556
3557                 $hook_data = ['item' => $item, 'html' => $s];
3558                 Hook::callAll('prepare_body_final', $hook_data);
3559
3560                 return $hook_data['html'];
3561         }
3562
3563         /**
3564          * get private link for item
3565          *
3566          * @param array $item
3567          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
3568          * @throws \Exception
3569          */
3570         public static function getPlink($item)
3571         {
3572                 $a = self::getApp();
3573
3574                 if ($a->user['nickname'] != "") {
3575                         $ret = [
3576                                 'href' => "display/" . $item['guid'],
3577                                 'orig' => "display/" . $item['guid'],
3578                                 'title' => L10n::t('View on separate page'),
3579                                 'orig_title' => L10n::t('view on separate page'),
3580                         ];
3581
3582                         if (!empty($item['plink'])) {
3583                                 $ret["href"] = $a->removeBaseURL($item['plink']);
3584                                 $ret["title"] = L10n::t('link to source');
3585                         }
3586
3587                 } elseif (!empty($item['plink']) && ($item['private'] != 1)) {
3588                         $ret = [
3589                                 'href' => $item['plink'],
3590                                 'orig' => $item['plink'],
3591                                 'title' => L10n::t('link to source'),
3592                         ];
3593                 } else {
3594                         $ret = [];
3595                 }
3596
3597                 return $ret;
3598         }
3599
3600         /**
3601          * Is the given item array a post that is sent as starting post to a forum?
3602          *
3603          * @param array $item
3604          * @param array $owner
3605          *
3606          * @return boolean "true" when it is a forum post
3607          */
3608         public static function isForumPost(array $item, array $owner = [])
3609         {
3610                 if (empty($owner)) {
3611                         $owner = User::getOwnerDataById($item['uid']);
3612                         if (empty($owner)) {
3613                                 return false;
3614                         }
3615                 }
3616
3617                 if (($item['author-id'] == $item['owner-id']) ||
3618                         ($owner['id'] == $item['contact-id']) ||
3619                         ($item['uri'] != $item['parent-uri']) ||
3620                         $item['origin']) {
3621                         return false;
3622                 }
3623
3624                 return Contact::isForum($item['contact-id']);
3625         }
3626
3627         /**
3628          * Search item id for given URI or plink
3629          *
3630          * @param string $uri
3631          * @param integer $uid
3632          *
3633          * @return integer item id
3634          */
3635         public static function searchByLink($uri, $uid = 0)
3636         {
3637                 $ssl_uri = str_replace('http://', 'https://', $uri);
3638                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3639
3640                 $item = DBA::selectFirst('item', ['id'], ['uri' => $uris, 'uid' => $uid]);
3641                 if (DBA::isResult($item)) {
3642                         return $item['id'];
3643                 }
3644
3645                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3646                 if (!DBA::isResult($itemcontent)) {
3647                         return 0;
3648                 }
3649
3650                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3651                 if (!DBA::isResult($itemuri)) {
3652                         return 0;
3653                 }
3654
3655                 $item = DBA::selectFirst('item', ['id'], ['uri' => $itemuri['uri'], 'uid' => $uid]);
3656                 if (DBA::isResult($item)) {
3657                         return $item['id'];
3658                 }
3659
3660                 return 0;
3661         }
3662
3663         /**
3664          * Fetches item for given URI or plink
3665          *
3666          * @param string $uri
3667          * @param integer $uid
3668          *
3669          * @return integer item id
3670          */
3671         public static function fetchByLink($uri, $uid = 0)
3672         {
3673                 $item_id = self::searchByLink($uri, $uid);
3674                 if (!empty($item_id)) {
3675                         return $item_id;
3676                 }
3677
3678                 if (ActivityPub\Processor::fetchMissingActivity($uri)) {
3679                         $item_id = self::searchByLink($uri, $uid);
3680                 } else {
3681                         $item_id = Diaspora::fetchByURL($uri);
3682                 }
3683
3684                 if (!empty($item_id)) {
3685                         return $item_id;
3686                 }
3687
3688                 return 0;
3689         }
3690 }