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