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