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                 $dsprsig = null;
1292                 if (isset($item['dsprsig'])) {
1293                         $encoded_signature = $item['dsprsig'];
1294                         $dsprsig = json_decode(base64_decode($item['dsprsig']));
1295                         unset($item['dsprsig']);
1296                 }
1297
1298                 $diaspora_signed_text = '';
1299                 if (isset($item['diaspora_signed_text'])) {
1300                         $diaspora_signed_text = $item['diaspora_signed_text'];
1301                         unset($item['diaspora_signed_text']);
1302                 }
1303
1304                 // Converting the plink
1305                 /// @TODO Check if this is really still needed
1306                 if ($item['network'] == Protocol::OSTATUS) {
1307                         if (isset($item['plink'])) {
1308                                 $item['plink'] = OStatus::convertHref($item['plink']);
1309                         } elseif (isset($item['uri'])) {
1310                                 $item['plink'] = OStatus::convertHref($item['uri']);
1311                         }
1312                 }
1313
1314                 if (!empty($item['thr-parent'])) {
1315                         $item['parent-uri'] = $item['thr-parent'];
1316                 }
1317
1318                 if (isset($item['gravity'])) {
1319                         $item['gravity'] = intval($item['gravity']);
1320                 } elseif ($item['parent-uri'] === $item['uri']) {
1321                         $item['gravity'] = GRAVITY_PARENT;
1322                 } elseif (activity_match($item['verb'], ACTIVITY_POST)) {
1323                         $item['gravity'] = GRAVITY_COMMENT;
1324                 } else {
1325                         $item['gravity'] = GRAVITY_UNKNOWN;   // Should not happen
1326                         logger('Unknown gravity for verb: ' . $item['verb'], LOGGER_DEBUG);
1327                 }
1328
1329                 $uid = intval($item['uid']);
1330
1331                 // check for create date and expire time
1332                 $expire_interval = Config::get('system', 'dbclean-expire-days', 0);
1333
1334                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $uid]);
1335                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
1336                         $expire_interval = $user['expire'];
1337                 }
1338
1339                 if (($expire_interval > 0) && !empty($item['created'])) {
1340                         $expire_date = time() - ($expire_interval * 86400);
1341                         $created_date = strtotime($item['created']);
1342                         if ($created_date < $expire_date) {
1343                                 logger('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), LOGGER_DEBUG);
1344                                 return 0;
1345                         }
1346                 }
1347
1348                 /*
1349                  * Do we already have this item?
1350                  * We have to check several networks since Friendica posts could be repeated
1351                  * via OStatus (maybe Diasporsa as well)
1352                  */
1353                 if (in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS, ""])) {
1354                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?)",
1355                                 trim($item['uri']), $item['uid'],
1356                                 Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
1357                         $existing = self::selectFirst(['id', 'network'], $condition);
1358                         if (DBA::isResult($existing)) {
1359                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
1360                                 if ($uid != 0) {
1361                                         logger("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
1362                                 }
1363
1364                                 return $existing["id"];
1365                         }
1366                 }
1367
1368                 // Ensure to always have the same creation date.
1369                 $existing = self::selectfirst(['created', 'uri-hash'], ['uri' => $item['uri']]);
1370                 if (DBA::isResult($existing)) {
1371                         $item['created'] = $existing['created'];
1372                         $item['uri-hash'] = $existing['uri-hash'];
1373                 }
1374
1375                 $item['wall']          = intval(defaults($item, 'wall', 0));
1376                 $item['extid']         = trim(defaults($item, 'extid', ''));
1377                 $item['author-name']   = trim(defaults($item, 'author-name', ''));
1378                 $item['author-link']   = trim(defaults($item, 'author-link', ''));
1379                 $item['author-avatar'] = trim(defaults($item, 'author-avatar', ''));
1380                 $item['owner-name']    = trim(defaults($item, 'owner-name', ''));
1381                 $item['owner-link']    = trim(defaults($item, 'owner-link', ''));
1382                 $item['owner-avatar']  = trim(defaults($item, 'owner-avatar', ''));
1383                 $item['received']      = ((x($item, 'received') !== false) ? DateTimeFormat::utc($item['received']) : DateTimeFormat::utcNow());
1384                 $item['created']       = ((x($item, 'created') !== false) ? DateTimeFormat::utc($item['created']) : $item['received']);
1385                 $item['edited']        = ((x($item, 'edited') !== false) ? DateTimeFormat::utc($item['edited']) : $item['created']);
1386                 $item['changed']       = ((x($item, 'changed') !== false) ? DateTimeFormat::utc($item['changed']) : $item['created']);
1387                 $item['commented']     = ((x($item, 'commented') !== false) ? DateTimeFormat::utc($item['commented']) : $item['created']);
1388                 $item['title']         = trim(defaults($item, 'title', ''));
1389                 $item['location']      = trim(defaults($item, 'location', ''));
1390                 $item['coord']         = trim(defaults($item, 'coord', ''));
1391                 $item['visible']       = ((x($item, 'visible') !== false) ? intval($item['visible'])         : 1);
1392                 $item['deleted']       = 0;
1393                 $item['parent-uri']    = trim(defaults($item, 'parent-uri', $item['uri']));
1394                 $item['post-type']     = defaults($item, 'post-type', self::PT_ARTICLE);
1395                 $item['verb']          = trim(defaults($item, 'verb', ''));
1396                 $item['object-type']   = trim(defaults($item, 'object-type', ''));
1397                 $item['object']        = trim(defaults($item, 'object', ''));
1398                 $item['target-type']   = trim(defaults($item, 'target-type', ''));
1399                 $item['target']        = trim(defaults($item, 'target', ''));
1400                 $item['plink']         = trim(defaults($item, 'plink', ''));
1401                 $item['allow_cid']     = trim(defaults($item, 'allow_cid', ''));
1402                 $item['allow_gid']     = trim(defaults($item, 'allow_gid', ''));
1403                 $item['deny_cid']      = trim(defaults($item, 'deny_cid', ''));
1404                 $item['deny_gid']      = trim(defaults($item, 'deny_gid', ''));
1405                 $item['private']       = intval(defaults($item, 'private', 0));
1406                 $item['body']          = trim(defaults($item, 'body', ''));
1407                 $item['tag']           = trim(defaults($item, 'tag', ''));
1408                 $item['attach']        = trim(defaults($item, 'attach', ''));
1409                 $item['app']           = trim(defaults($item, 'app', ''));
1410                 $item['origin']        = intval(defaults($item, 'origin', 0));
1411                 $item['postopts']      = trim(defaults($item, 'postopts', ''));
1412                 $item['resource-id']   = trim(defaults($item, 'resource-id', ''));
1413                 $item['event-id']      = intval(defaults($item, 'event-id', 0));
1414                 $item['inform']        = trim(defaults($item, 'inform', ''));
1415                 $item['file']          = trim(defaults($item, 'file', ''));
1416
1417                 // Unique identifier to be linked against item-activities and item-content
1418                 $item['uri-hash']      = defaults($item, 'uri-hash', self::itemHash($item['uri'], $item['created']));
1419
1420                 // When there is no content then we don't post it
1421                 if ($item['body'].$item['title'] == '') {
1422                         logger('No body, no title.');
1423                         return 0;
1424                 }
1425
1426                 self::addLanguageToItemArray($item);
1427
1428                 // Items cannot be stored before they happen ...
1429                 if ($item['created'] > DateTimeFormat::utcNow()) {
1430                         $item['created'] = DateTimeFormat::utcNow();
1431                 }
1432
1433                 // We haven't invented time travel by now.
1434                 if ($item['edited'] > DateTimeFormat::utcNow()) {
1435                         $item['edited'] = DateTimeFormat::utcNow();
1436                 }
1437
1438                 $item['plink'] = defaults($item, 'plink', System::baseUrl() . '/display/' . urlencode($item['guid']));
1439
1440                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
1441                 $item["contact-id"] = self::contactId($item);
1442
1443                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
1444                         'photo' => $item['author-avatar'], 'network' => $item['network']];
1445
1446                 $item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
1447
1448                 if (Contact::isBlocked($item["author-id"])) {
1449                         logger('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
1450                         return 0;
1451                 }
1452
1453                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
1454                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
1455
1456                 $item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
1457
1458                 if (Contact::isBlocked($item["owner-id"])) {
1459                         logger('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
1460                         return 0;
1461                 }
1462
1463                 if ($item['network'] == Protocol::PHANTOM) {
1464                         logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
1465
1466                         $item['network'] = Protocol::DFRN;
1467                         logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
1468                 }
1469
1470                 // Checking if there is already an item with the same guid
1471                 logger('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], LOGGER_DEBUG);
1472                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
1473                 if (self::exists($condition)) {
1474                         logger('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], LOGGER_DEBUG);
1475                         return 0;
1476                 }
1477
1478                 // Check for hashtags in the body and repair or add hashtag links
1479                 self::setHashtags($item);
1480
1481                 $item['thr-parent'] = $item['parent-uri'];
1482
1483                 $notify_type = '';
1484                 $allow_cid = '';
1485                 $allow_gid = '';
1486                 $deny_cid  = '';
1487                 $deny_gid  = '';
1488
1489                 if ($item['parent-uri'] === $item['uri']) {
1490                         $diaspora_signed_text = '';
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                                 $notify_type    = 'comment-new';
1536
1537                                 if (!$parent['origin']) {
1538                                         $diaspora_signed_text = '';
1539                                 }
1540
1541                                 /*
1542                                  * If the parent is private, force privacy for the entire conversation
1543                                  * This differs from the above settings as it subtly allows comments from
1544                                  * email correspondents to be private even if the overall thread is not.
1545                                  */
1546                                 if ($parent['private']) {
1547                                         $item['private'] = $parent['private'];
1548                                 }
1549
1550                                 /*
1551                                  * Edge case. We host a public forum that was originally posted to privately.
1552                                  * The original author commented, but as this is a comment, the permissions
1553                                  * weren't fixed up so it will still show the comment as private unless we fix it here.
1554                                  */
1555                                 if ((intval($parent['forum_mode']) == 1) && $parent['private']) {
1556                                         $item['private'] = 0;
1557                                 }
1558
1559                                 // If its a post from myself then tag the thread as "mention"
1560                                 logger("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], LOGGER_DEBUG);
1561                                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
1562                                 if (DBA::isResult($user)) {
1563                                         $self = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
1564                                         $self_id = Contact::getIdForURL($self, 0, true);
1565                                         logger("'myself' is ".$self_id." for parent ".$parent_id." checking against ".$item['author-id']." and ".$item['owner-id'], LOGGER_DEBUG);
1566                                         if (($item['author-id'] == $self_id) || ($item['owner-id'] == $self_id)) {
1567                                                 DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
1568                                                 logger("tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
1569                                         }
1570                                 }
1571                         } else {
1572                                 /*
1573                                  * Allow one to see reply tweets from status.net even when
1574                                  * we don't have or can't see the original post.
1575                                  */
1576                                 if ($force_parent) {
1577                                         logger('$force_parent=true, reply converted to top-level post.');
1578                                         $parent_id = 0;
1579                                         $item['parent-uri'] = $item['uri'];
1580                                         $item['gravity'] = GRAVITY_PARENT;
1581                                         $diaspora_signed_text = '';
1582                                 } else {
1583                                         logger('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
1584                                         return 0;
1585                                 }
1586
1587                                 $parent_deleted = 0;
1588                         }
1589                 }
1590
1591                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
1592                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
1593
1594                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
1595                         $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
1596                 if (self::exists($condition)) {
1597                         logger('duplicated item with the same uri found. '.print_r($item,true));
1598                         return 0;
1599                 }
1600
1601                 // On Friendica and Diaspora the GUID is unique
1602                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
1603                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
1604                         if (self::exists($condition)) {
1605                                 logger('duplicated item with the same guid found. '.print_r($item,true));
1606                                 return 0;
1607                         }
1608                 } else {
1609                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
1610                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
1611                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
1612                         if (self::exists($condition)) {
1613                                 logger('duplicated item with the same body found. '.print_r($item,true));
1614                                 return 0;
1615                         }
1616                 }
1617
1618                 // Is this item available in the global items (with uid=0)?
1619                 if ($item["uid"] == 0) {
1620                         $item["global"] = true;
1621
1622                         // Set the global flag on all items if this was a global item entry
1623                         self::update(['global' => true], ['uri' => $item["uri"]]);
1624                 } else {
1625                         $item["global"] = self::exists(['uid' => 0, 'uri' => $item["uri"]]);
1626                 }
1627
1628                 // ACL settings
1629                 if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
1630                         $private = 1;
1631                 } else {
1632                         $private = $item['private'];
1633                 }
1634
1635                 $item["allow_cid"] = $allow_cid;
1636                 $item["allow_gid"] = $allow_gid;
1637                 $item["deny_cid"] = $deny_cid;
1638                 $item["deny_gid"] = $deny_gid;
1639                 $item["private"] = $private;
1640                 $item["deleted"] = $parent_deleted;
1641
1642                 // Fill the cache field
1643                 put_item_in_cache($item);
1644
1645                 if ($notify) {
1646                         $item['edit'] = false;
1647                         $item['parent'] = $parent_id;
1648                         Addon::callHooks('post_local', $item);
1649                         unset($item['edit']);
1650                         unset($item['parent']);
1651                 } else {
1652                         Addon::callHooks('post_remote', $item);
1653                 }
1654
1655                 // This array field is used to trigger some automatic reactions
1656                 // It is mainly used in the "post_local" hook.
1657                 unset($item['api_source']);
1658
1659                 if (x($item, 'cancel')) {
1660                         logger('post cancelled by addon.');
1661                         return 0;
1662                 }
1663
1664                 /*
1665                  * Check for already added items.
1666                  * There is a timing issue here that sometimes creates double postings.
1667                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
1668                  */
1669                 if ($item["uid"] == 0) {
1670                         if (self::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
1671                                 logger('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], LOGGER_DEBUG);
1672                                 return 0;
1673                         }
1674                 }
1675
1676                 logger('' . print_r($item,true), LOGGER_DATA);
1677
1678                 if (array_key_exists('tag', $item)) {
1679                         $tags = $item['tag'];
1680                         unset($item['tag']);
1681                 } else {
1682                         $tags = '';
1683                 }
1684
1685                 if (array_key_exists('file', $item)) {
1686                         $files = $item['file'];
1687                         unset($item['file']);
1688                 } else {
1689                         $files = '';
1690                 }
1691
1692                 // Creates or assigns the permission set
1693                 $item['psid'] = PermissionSet::fetchIDForPost($item);
1694
1695                 // We are doing this outside of the transaction to avoid timing problems
1696                 if (!self::insertActivity($item)) {
1697                         self::insertContent($item);
1698                 }
1699
1700                 $delivery_data = ['postopts' => defaults($item, 'postopts', ''),
1701                         'inform' => defaults($item, 'inform', '')];
1702
1703                 unset($item['postopts']);
1704                 unset($item['inform']);
1705
1706                 // These fields aren't stored anymore in the item table, they are fetched upon request
1707                 unset($item['author-link']);
1708                 unset($item['author-name']);
1709                 unset($item['author-avatar']);
1710
1711                 unset($item['owner-link']);
1712                 unset($item['owner-name']);
1713                 unset($item['owner-avatar']);
1714
1715                 DBA::transaction();
1716                 $ret = DBA::insert('item', $item);
1717
1718                 // When the item was successfully stored we fetch the ID of the item.
1719                 if (DBA::isResult($ret)) {
1720                         $current_post = DBA::lastInsertId();
1721                 } else {
1722                         // This can happen - for example - if there are locking timeouts.
1723                         DBA::rollback();
1724
1725                         // Store the data into a spool file so that we can try again later.
1726
1727                         // At first we restore the Diaspora signature that we removed above.
1728                         if (isset($encoded_signature)) {
1729                                 $item['dsprsig'] = $encoded_signature;
1730                         }
1731
1732                         // Now we store the data in the spool directory
1733                         // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
1734                         $file = 'item-'.round(microtime(true) * 10000).'-'.mt_rand().'.msg';
1735
1736                         $spoolpath = get_spoolpath();
1737                         if ($spoolpath != "") {
1738                                 $spool = $spoolpath.'/'.$file;
1739
1740                                 // Ensure to have the removed data from above again in the item array
1741                                 $item = array_merge($item, $delivery_data);
1742
1743                                 file_put_contents($spool, json_encode($item));
1744                                 logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
1745                         }
1746                         return 0;
1747                 }
1748
1749                 if ($current_post == 0) {
1750                         // This is one of these error messages that never should occur.
1751                         logger("couldn't find created item - we better quit now.");
1752                         DBA::rollback();
1753                         return 0;
1754                 }
1755
1756                 // How much entries have we created?
1757                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
1758                 $entries = DBA::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
1759
1760                 if ($entries > 1) {
1761                         // There are duplicates. We delete our just created entry.
1762                         logger('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
1763
1764                         // Yes, we could do a rollback here - but we are having many users with MyISAM.
1765                         DBA::delete('item', ['id' => $current_post]);
1766                         DBA::commit();
1767                         return 0;
1768                 } elseif ($entries == 0) {
1769                         // This really should never happen since we quit earlier if there were problems.
1770                         logger("Something is terribly wrong. We haven't found our created entry.");
1771                         DBA::rollback();
1772                         return 0;
1773                 }
1774
1775                 logger('created item '.$current_post);
1776                 self::updateContact($item);
1777
1778                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
1779                         $parent_id = $current_post;
1780                 }
1781
1782                 // Set parent id
1783                 self::update(['parent' => $parent_id], ['id' => $current_post]);
1784
1785                 $item['id'] = $current_post;
1786                 $item['parent'] = $parent_id;
1787
1788                 // update the commented timestamp on the parent
1789                 // Only update "commented" if it is really a comment
1790                 if (($item['gravity'] != GRAVITY_ACTIVITY) || !Config::get("system", "like_no_comment")) {
1791                         self::update(['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1792                 } else {
1793                         self::update(['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1794                 }
1795
1796                 if ($dsprsig) {
1797                         /*
1798                          * Friendica servers lower than 3.4.3-2 had double encoded the signature ...
1799                          * We can check for this condition when we decode and encode the stuff again.
1800                          */
1801                         if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
1802                                 $dsprsig->signature = base64_decode($dsprsig->signature);
1803                                 logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
1804                         }
1805
1806                         DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
1807                                                 'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
1808                 }
1809
1810                 if (!empty($diaspora_signed_text)) {
1811                         // Formerly we stored the signed text, the signature and the author in different fields.
1812                         // We now store the raw data so that we are more flexible.
1813                         DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $diaspora_signed_text]);
1814                 }
1815
1816                 $deleted = self::tagDeliver($item['uid'], $current_post);
1817
1818                 /*
1819                  * current post can be deleted if is for a community page and no mention are
1820                  * in it.
1821                  */
1822                 if (!$deleted && !$dontcache) {
1823                         $posted_item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1824                         if (DBA::isResult($posted_item)) {
1825                                 if ($notify) {
1826                                         Addon::callHooks('post_local_end', $posted_item);
1827                                 } else {
1828                                         Addon::callHooks('post_remote_end', $posted_item);
1829                                 }
1830                         } else {
1831                                 logger('new item not found in DB, id ' . $current_post);
1832                         }
1833                 }
1834
1835                 if ($item['parent-uri'] === $item['uri']) {
1836                         self::addThread($current_post);
1837                 } else {
1838                         self::updateThread($parent_id);
1839                 }
1840
1841                 $delivery_data['iid'] = $current_post;
1842
1843                 self::insertDeliveryData($delivery_data);
1844
1845                 DBA::commit();
1846
1847                 /*
1848                  * Due to deadlock issues with the "term" table we are doing these steps after the commit.
1849                  * This is not perfect - but a workable solution until we found the reason for the problem.
1850                  */
1851                 if (!empty($tags)) {
1852                         Term::insertFromTagFieldByItemId($current_post, $tags);
1853                 }
1854
1855                 if (!empty($files)) {
1856                         Term::insertFromFileFieldByItemId($current_post, $files);
1857                 }
1858
1859                 if ($item['parent-uri'] === $item['uri']) {
1860                         self::addShadow($current_post);
1861                 } else {
1862                         self::addShadowPost($current_post);
1863                 }
1864
1865                 check_user_notification($current_post);
1866
1867                 if ($notify) {
1868                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", $notify_type, $current_post);
1869                 } elseif (!empty($parent) && $parent['origin']) {
1870                         Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "Notifier", "comment-import", $current_post);
1871                 }
1872
1873                 return $current_post;
1874         }
1875
1876         /**
1877          * @brief Insert a new item delivery data entry
1878          *
1879          * @param array $item The item fields that are to be inserted
1880          */
1881         private static function insertDeliveryData($delivery_data)
1882         {
1883                 if (empty($delivery_data['iid']) || (empty($delivery_data['postopts']) && empty($delivery_data['inform']))) {
1884                         return;
1885                 }
1886
1887                 DBA::insert('item-delivery-data', $delivery_data);
1888         }
1889
1890         /**
1891          * @brief Update an existing item delivery data entry
1892          *
1893          * @param integer $id The item id that is to be updated
1894          * @param array $item The item fields that are to be inserted
1895          */
1896         private static function updateDeliveryData($id, $delivery_data)
1897         {
1898                 if (empty($id) || (empty($delivery_data['postopts']) && empty($delivery_data['inform']))) {
1899                         return;
1900                 }
1901
1902                 DBA::update('item-delivery-data', $delivery_data, ['iid' => $id], true);
1903         }
1904
1905         /**
1906          * @brief Insert a new item content entry
1907          *
1908          * @param array $item The item fields that are to be inserted
1909          */
1910         private static function insertActivity(&$item)
1911         {
1912                 $activity_index = self::activityToIndex($item['verb']);
1913
1914                 if ($activity_index < 0) {
1915                         return false;
1916                 }
1917
1918                 $fields = ['uri' => $item['uri'], 'activity' => $activity_index,
1919                         'uri-hash' => $item['uri-hash'], 'uri-id' => $item['uri-id']];
1920
1921                 // We just remove everything that is content
1922                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1923                         unset($item[$field]);
1924                 }
1925
1926                 // To avoid timing problems, we are using locks.
1927                 $locked = Lock::acquire('item_insert_activity');
1928                 if (!$locked) {
1929                         logger("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
1930                 }
1931
1932                 // Do we already have this content?
1933                 $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-hash' => $item['uri-hash']]);
1934                 if (DBA::isResult($item_activity)) {
1935                         $item['iaid'] = $item_activity['id'];
1936                         logger('Fetched activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
1937                 } elseif (DBA::insert('item-activity', $fields)) {
1938                         $item['iaid'] = DBA::lastInsertId();
1939                         logger('Inserted activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
1940                 } else {
1941                         // This shouldn't happen.
1942                         logger('Could not insert activity for URI ' . $item['uri'] . ' - should not happen');
1943                         Lock::release('item_insert_activity');
1944                         return false;
1945                 }
1946                 if ($locked) {
1947                         Lock::release('item_insert_activity');
1948                 }
1949                 return true;
1950         }
1951
1952         /**
1953          * @brief Insert a new item content entry
1954          *
1955          * @param array $item The item fields that are to be inserted
1956          */
1957         private static function insertContent(&$item)
1958         {
1959                 $fields = ['uri' => $item['uri'], 'uri-plink-hash' => $item['uri-hash'],
1960                         'uri-id' => $item['uri-id']];
1961
1962                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1963                         if (isset($item[$field])) {
1964                                 $fields[$field] = $item[$field];
1965                                 unset($item[$field]);
1966                         }
1967                 }
1968
1969                 // To avoid timing problems, we are using locks.
1970                 $locked = Lock::acquire('item_insert_content');
1971                 if (!$locked) {
1972                         logger("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
1973                 }
1974
1975                 // Do we already have this content?
1976                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-plink-hash' => $item['uri-hash']]);
1977                 if (DBA::isResult($item_content)) {
1978                         $item['icid'] = $item_content['id'];
1979                         logger('Fetched content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
1980                 } elseif (DBA::insert('item-content', $fields)) {
1981                         $item['icid'] = DBA::lastInsertId();
1982                         logger('Inserted content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
1983                 } else {
1984                         // This shouldn't happen.
1985                         logger('Could not insert content for URI ' . $item['uri'] . ' - should not happen');
1986                 }
1987                 if ($locked) {
1988                         Lock::release('item_insert_content');
1989                 }
1990         }
1991
1992         /**
1993          * @brief Update existing item content entries
1994          *
1995          * @param array $item The item fields that are to be changed
1996          * @param array $condition The condition for finding the item content entries
1997          */
1998         private static function updateActivity($item, $condition)
1999         {
2000                 if (empty($item['verb'])) {
2001                         return false;
2002                 }
2003                 $activity_index = self::activityToIndex($item['verb']);
2004
2005                 if ($activity_index < 0) {
2006                         return false;
2007                 }
2008
2009                 $fields = ['activity' => $activity_index];
2010
2011                 logger('Update activity for ' . json_encode($condition));
2012
2013                 DBA::update('item-activity', $fields, $condition, true);
2014
2015                 return true;
2016         }
2017
2018         /**
2019          * @brief Update existing item content entries
2020          *
2021          * @param array $item The item fields that are to be changed
2022          * @param array $condition The condition for finding the item content entries
2023          */
2024         private static function updateContent($item, $condition)
2025         {
2026                 // We have to select only the fields from the "item-content" table
2027                 $fields = [];
2028                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
2029                         if (isset($item[$field])) {
2030                                 $fields[$field] = $item[$field];
2031                         }
2032                 }
2033
2034                 if (empty($fields)) {
2035                         // when there are no fields at all, just use the condition
2036                         // This is to ensure that we always store content.
2037                         $fields = $condition;
2038                 }
2039
2040                 logger('Update content for ' . json_encode($condition));
2041
2042                 DBA::update('item-content', $fields, $condition, true);
2043         }
2044
2045         /**
2046          * @brief Distributes public items to the receivers
2047          *
2048          * @param integer $itemid      Item ID that should be added
2049          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
2050          */
2051         public static function distribute($itemid, $signed_text = '')
2052         {
2053                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
2054                 $parent = self::selectFirst(['owner-id'], $condition);
2055                 if (!DBA::isResult($parent)) {
2056                         return;
2057                 }
2058
2059                 // Only distribute public items from native networks
2060                 $condition = ['id' => $itemid, 'uid' => 0,
2061                         'network' => [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS, ""],
2062                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
2063                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2064                 if (!DBA::isResult($item)) {
2065                         return;
2066                 }
2067
2068                 $origin = $item['origin'];
2069
2070                 unset($item['id']);
2071                 unset($item['parent']);
2072                 unset($item['mention']);
2073                 unset($item['wall']);
2074                 unset($item['origin']);
2075                 unset($item['starred']);
2076
2077                 $users = [];
2078
2079                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
2080                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
2081                 if (!DBA::isResult($owner)) {
2082                         return;
2083                 }
2084
2085                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2086                 $contacts = DBA::select('contact', ['uid'], $condition);
2087                 while ($contact = DBA::fetch($contacts)) {
2088                         if ($contact['uid'] == 0) {
2089                                 continue;
2090                         }
2091
2092                         $users[$contact['uid']] = $contact['uid'];
2093                 }
2094                 DBA::close($contacts);
2095
2096                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2097                 $contacts = DBA::select('contact', ['uid'], $condition);
2098                 while ($contact = DBA::fetch($contacts)) {
2099                         if ($contact['uid'] == 0) {
2100                                 continue;
2101                         }
2102
2103                         $users[$contact['uid']] = $contact['uid'];
2104                 }
2105                 DBA::close($contacts);
2106
2107                 if (!empty($owner['alias'])) {
2108                         $condition = ['url' => $owner['alias'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2109                         $contacts = DBA::select('contact', ['uid'], $condition);
2110                         while ($contact = DBA::fetch($contacts)) {
2111                                 if ($contact['uid'] == 0) {
2112                                         continue;
2113                                 }
2114
2115                                 $users[$contact['uid']] = $contact['uid'];
2116                         }
2117                         DBA::close($contacts);
2118                 }
2119
2120                 $origin_uid = 0;
2121
2122                 if ($item['uri'] != $item['parent-uri']) {
2123                         $parents = self::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
2124                         while ($parent = self::fetch($parents)) {
2125                                 $users[$parent['uid']] = $parent['uid'];
2126                                 if ($parent['origin'] && !$origin) {
2127                                         $origin_uid = $parent['uid'];
2128                                 }
2129                         }
2130                 }
2131
2132                 foreach ($users as $uid) {
2133                         if ($origin_uid == $uid) {
2134                                 $item['diaspora_signed_text'] = $signed_text;
2135                         }
2136                         self::storeForUser($itemid, $item, $uid);
2137                 }
2138         }
2139
2140         /**
2141          * @brief Store public items for the receivers
2142          *
2143          * @param integer $itemid Item ID that should be added
2144          * @param array   $item   The item entry that will be stored
2145          * @param integer $uid    The user that will receive the item entry
2146          */
2147         private static function storeForUser($itemid, $item, $uid)
2148         {
2149                 $item['uid'] = $uid;
2150                 $item['origin'] = 0;
2151                 $item['wall'] = 0;
2152                 if ($item['uri'] == $item['parent-uri']) {
2153                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
2154                 } else {
2155                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
2156                 }
2157
2158                 if (empty($item['contact-id'])) {
2159                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
2160                         if (!DBA::isResult($self)) {
2161                                 return;
2162                         }
2163                         $item['contact-id'] = $self['id'];
2164                 }
2165
2166                 /// @todo Handling of "event-id"
2167
2168                 $notify = false;
2169                 if ($item['uri'] == $item['parent-uri']) {
2170                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
2171                         if (DBA::isResult($contact)) {
2172                                 $notify = self::isRemoteSelf($contact, $item);
2173                         }
2174                 }
2175
2176                 $distributed = self::insert($item, false, $notify, true);
2177
2178                 if (!$distributed) {
2179                         logger("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", LOGGER_DEBUG);
2180                 } else {
2181                         logger("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, LOGGER_DEBUG);
2182                 }
2183         }
2184
2185         /**
2186          * @brief Add a shadow entry for a given item id that is a thread starter
2187          *
2188          * We store every public item entry additionally with the user id "0".
2189          * This is used for the community page and for the search.
2190          * It is planned that in the future we will store public item entries only once.
2191          *
2192          * @param integer $itemid Item ID that should be added
2193          */
2194         public static function addShadow($itemid)
2195         {
2196                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri'];
2197                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
2198                 $item = self::selectFirst($fields, $condition);
2199
2200                 if (!DBA::isResult($item)) {
2201                         return;
2202                 }
2203
2204                 // is it already a copy?
2205                 if (($itemid == 0) || ($item['uid'] == 0)) {
2206                         return;
2207                 }
2208
2209                 // Is it a visible public post?
2210                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || $item["private"]) {
2211                         return;
2212                 }
2213
2214                 // is it an entry from a connector? Only add an entry for natively connected networks
2215                 if (!in_array($item["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS, ""])) {
2216                         return;
2217                 }
2218
2219                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2220                         return;
2221                 }
2222
2223                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2224
2225                 if (DBA::isResult($item)) {
2226                         // Preparing public shadow (removing user specific data)
2227                         $item['uid'] = 0;
2228                         unset($item['id']);
2229                         unset($item['parent']);
2230                         unset($item['wall']);
2231                         unset($item['mention']);
2232                         unset($item['origin']);
2233                         unset($item['starred']);
2234                         unset($item['postopts']);
2235                         unset($item['inform']);
2236                         if ($item['uri'] == $item['parent-uri']) {
2237                                 $item['contact-id'] = $item['owner-id'];
2238                         } else {
2239                                 $item['contact-id'] = $item['author-id'];
2240                         }
2241
2242                         $public_shadow = self::insert($item, false, false, true);
2243
2244                         logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
2245                 }
2246         }
2247
2248         /**
2249          * @brief Add a shadow entry for a given item id that is a comment
2250          *
2251          * This function does the same like the function above - but for comments
2252          *
2253          * @param integer $itemid Item ID that should be added
2254          */
2255         public static function addShadowPost($itemid)
2256         {
2257                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2258                 if (!DBA::isResult($item)) {
2259                         return;
2260                 }
2261
2262                 // Is it a toplevel post?
2263                 if ($item['id'] == $item['parent']) {
2264                         self::addShadow($itemid);
2265                         return;
2266                 }
2267
2268                 // Is this a shadow entry?
2269                 if ($item['uid'] == 0) {
2270                         return;
2271                 }
2272
2273                 // Is there a shadow parent?
2274                 if (!self::exists(['uri' => $item['parent-uri'], 'uid' => 0])) {
2275                         return;
2276                 }
2277
2278                 // Is there already a shadow entry?
2279                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2280                         return;
2281                 }
2282
2283                 // Save "origin" and "parent" state
2284                 $origin = $item['origin'];
2285                 $parent = $item['parent'];
2286
2287                 // Preparing public shadow (removing user specific data)
2288                 $item['uid'] = 0;
2289                 unset($item['id']);
2290                 unset($item['parent']);
2291                 unset($item['wall']);
2292                 unset($item['mention']);
2293                 unset($item['origin']);
2294                 unset($item['starred']);
2295                 unset($item['postopts']);
2296                 unset($item['inform']);
2297                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
2298
2299                 $public_shadow = self::insert($item, false, false, true);
2300
2301                 logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);
2302
2303                 // If this was a comment to a Diaspora post we don't get our comment back.
2304                 // This means that we have to distribute the comment by ourselves.
2305                 if ($origin && self::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
2306                         self::distribute($public_shadow);
2307                 }
2308         }
2309
2310          /**
2311          * Adds a language specification in a "language" element of given $arr.
2312          * Expects "body" element to exist in $arr.
2313          */
2314         private static function addLanguageToItemArray(&$item)
2315         {
2316                 $naked_body = BBCode::toPlaintext($item['body'], false);
2317
2318                 $ld = new Text_LanguageDetect();
2319                 $ld->setNameMode(2);
2320                 $languages = $ld->detect($naked_body, 3);
2321
2322                 if (is_array($languages)) {
2323                         $item['language'] = json_encode($languages);
2324                 }
2325         }
2326
2327         /**
2328          * @brief Creates an unique guid out of a given uri
2329          *
2330          * @param string $uri uri of an item entry
2331          * @param string $host hostname for the GUID prefix
2332          * @return string unique guid
2333          */
2334         public static function guidFromUri($uri, $host)
2335         {
2336                 // Our regular guid routine is using this kind of prefix as well
2337                 // We have to avoid that different routines could accidentally create the same value
2338                 $parsed = parse_url($uri);
2339
2340                 // We use a hash of the hostname as prefix for the guid
2341                 $guid_prefix = hash("crc32", $host);
2342
2343                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
2344                 unset($parsed["scheme"]);
2345
2346                 // Glue it together to be able to make a hash from it
2347                 $host_id = implode("/", $parsed);
2348
2349                 // We could use any hash algorithm since it isn't a security issue
2350                 $host_hash = hash("ripemd128", $host_id);
2351
2352                 return $guid_prefix.$host_hash;
2353         }
2354
2355         /**
2356          * generate an unique URI
2357          *
2358          * @param integer $uid User id
2359          * @param string $guid An existing GUID (Otherwise it will be generated)
2360          *
2361          * @return string
2362          */
2363         public static function newURI($uid, $guid = "")
2364         {
2365                 if ($guid == "") {
2366                         $guid = System::createUUID();
2367                 }
2368
2369                 return self::getApp()->getBaseURL() . '/objects/' . $guid;
2370         }
2371
2372         /**
2373          * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
2374          *
2375          * This can be used to filter for inactive contacts.
2376          * Only do this for public postings to avoid privacy problems, since poco data is public.
2377          * Don't set this value if it isn't from the owner (could be an author that we don't know)
2378          *
2379          * @param array $arr Contains the just posted item record
2380          */
2381         private static function updateContact($arr)
2382         {
2383                 // Unarchive the author
2384                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
2385                 if (DBA::isResult($contact)) {
2386                         Contact::unmarkForArchival($contact);
2387                 }
2388
2389                 // Unarchive the contact if it's not our own contact
2390                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
2391                 if (DBA::isResult($contact)) {
2392                         Contact::unmarkForArchival($contact);
2393                 }
2394
2395                 $update = (!$arr['private'] && ((defaults($arr, 'author-link', '') === defaults($arr, 'owner-link', '')) || ($arr["parent-uri"] === $arr["uri"])));
2396
2397                 // Is it a forum? Then we don't care about the rules from above
2398                 if (!$update && ($arr["network"] == Protocol::DFRN) && ($arr["parent-uri"] === $arr["uri"])) {
2399                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
2400                                 $update = true;
2401                         }
2402                 }
2403
2404                 if ($update) {
2405                         DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2406                                 ['id' => $arr['contact-id']]);
2407                 }
2408                 // Now do the same for the system wide contacts with uid=0
2409                 if (!$arr['private']) {
2410                         DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2411                                 ['id' => $arr['owner-id']]);
2412
2413                         if ($arr['owner-id'] != $arr['author-id']) {
2414                                 DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2415                                         ['id' => $arr['author-id']]);
2416                         }
2417                 }
2418         }
2419
2420         public static function setHashtags(&$item)
2421         {
2422
2423                 $tags = get_tags($item["body"]);
2424
2425                 // No hashtags?
2426                 if (!count($tags)) {
2427                         return false;
2428                 }
2429
2430                 // This sorting is important when there are hashtags that are part of other hashtags
2431                 // Otherwise there could be problems with hashtags like #test and #test2
2432                 rsort($tags);
2433
2434                 $URLSearchString = "^\[\]";
2435
2436                 // All hashtags should point to the home server if "local_tags" is activated
2437                 if (Config::get('system', 'local_tags')) {
2438                         $item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2439                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["body"]);
2440
2441                         $item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2442                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["tag"]);
2443                 }
2444
2445                 // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
2446                 $item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2447                         function ($match) {
2448                                 return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
2449                         }, $item["body"]);
2450
2451                 $item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
2452                         function ($match) {
2453                                 return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
2454                         }, $item["body"]);
2455
2456                 $item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
2457                         function ($match) {
2458                                 return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
2459                         }, $item["body"]);
2460
2461                 // Repair recursive urls
2462                 $item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2463                                 "&num;$2", $item["body"]);
2464
2465                 foreach ($tags as $tag) {
2466                         if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=')) {
2467                                 continue;
2468                         }
2469
2470                         $basetag = str_replace('_',' ',substr($tag,1));
2471
2472                         $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . rawurlencode($basetag) . ']' . $basetag . '[/url]';
2473
2474                         $item["body"] = str_replace($tag, $newtag, $item["body"]);
2475
2476                         if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
2477                                 if (strlen($item["tag"])) {
2478                                         $item["tag"] = ','.$item["tag"];
2479                                 }
2480                                 $item["tag"] = $newtag.$item["tag"];
2481                         }
2482                 }
2483
2484                 // Convert back the masked hashtags
2485                 $item["body"] = str_replace("&num;", "#", $item["body"]);
2486         }
2487
2488         public static function getGuidById($id)
2489         {
2490                 $item = self::selectFirst(['guid'], ['id' => $id]);
2491                 if (DBA::isResult($item)) {
2492                         return $item['guid'];
2493                 } else {
2494                         return '';
2495                 }
2496         }
2497
2498         /**
2499          * This function is only used for the old Friendica app on Android that doesn't like paths with guid
2500          * @param string $guid item guid
2501          * @param int    $uid  user id
2502          * @return array with id and nick of the item with the given guid
2503          */
2504         public static function getIdAndNickByGuid($guid, $uid = 0)
2505         {
2506                 $nick = "";
2507                 $id = 0;
2508
2509                 if ($uid == 0) {
2510                         $uid == local_user();
2511                 }
2512
2513                 // Does the given user have this item?
2514                 if ($uid) {
2515                         $item = self::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
2516                         if (DBA::isResult($item)) {
2517                                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $uid]);
2518                                 if (!DBA::isResult($user)) {
2519                                         return;
2520                                 }
2521                                 $id = $item['id'];
2522                                 $nick = $user['nickname'];
2523                         }
2524                 }
2525
2526                 // Or is it anywhere on the server?
2527                 if ($nick == "") {
2528                         $condition = ["`guid` = ? AND `uid` != 0", $guid];
2529                         $item = self::selectFirst(['id', 'uid'], $condition);
2530                         if (DBA::isResult($item)) {
2531                                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
2532                                 if (!DBA::isResult($user)) {
2533                                         return;
2534                                 }
2535                                 $id = $item['id'];
2536                                 $nick = $user['nickname'];
2537                         }
2538                 }
2539                 return ["nick" => $nick, "id" => $id];
2540         }
2541
2542         /**
2543          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
2544          * @param int $uid
2545          * @param int $item_id
2546          * @return bool true if item was deleted, else false
2547          */
2548         private static function tagDeliver($uid, $item_id)
2549         {
2550                 $mention = false;
2551
2552                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
2553                 if (!DBA::isResult($user)) {
2554                         return;
2555                 }
2556
2557                 $community_page = (($user['page-flags'] == Contact::PAGE_COMMUNITY) ? true : false);
2558                 $prvgroup = (($user['page-flags'] == Contact::PAGE_PRVGROUP) ? true : false);
2559
2560                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2561                 if (!DBA::isResult($item)) {
2562                         return;
2563                 }
2564
2565                 $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
2566
2567                 /*
2568                  * Diaspora uses their own hardwired link URL in @-tags
2569                  * instead of the one we supply with webfinger
2570                  */
2571                 $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
2572
2573                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2574                 if ($cnt) {
2575                         foreach ($matches as $mtch) {
2576                                 if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
2577                                         $mention = true;
2578                                         logger('mention found: ' . $mtch[2]);
2579                                 }
2580                         }
2581                 }
2582
2583                 if (!$mention) {
2584                         if (($community_page || $prvgroup) &&
2585                                   !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
2586                                 // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
2587                                 // delete it!
2588                                 logger("no-mention top-level post to community or private group. delete.");
2589                                 DBA::delete('item', ['id' => $item_id]);
2590                                 return true;
2591                         }
2592                         return;
2593                 }
2594
2595                 $arr = ['item' => $item, 'user' => $user];
2596
2597                 Addon::callHooks('tagged', $arr);
2598
2599                 if (!$community_page && !$prvgroup) {
2600                         return;
2601                 }
2602
2603                 /*
2604                  * tgroup delivery - setup a second delivery chain
2605                  * prevent delivery looping - only proceed
2606                  * if the message originated elsewhere and is a top-level post
2607                  */
2608                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2609                         return;
2610                 }
2611
2612                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2613                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2614                 if (!DBA::isResult($self)) {
2615                         return;
2616                 }
2617
2618                 $owner_id = Contact::getIdForURL($self['url']);
2619
2620                 // also reset all the privacy bits to the forum default permissions
2621
2622                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
2623
2624                 $psid = PermissionSet::fetchIDForPost($user);
2625
2626                 $forum_mode = ($prvgroup ? 2 : 1);
2627
2628                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2629                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2630                 self::update($fields, ['id' => $item_id]);
2631
2632                 self::updateThread($item_id);
2633
2634                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', 'tgroup', $item_id);
2635         }
2636
2637         public static function isRemoteSelf($contact, &$datarray)
2638         {
2639                 $a = get_app();
2640
2641                 if (!$contact['remote_self']) {
2642                         return false;
2643                 }
2644
2645                 // Prevent the forwarding of posts that are forwarded
2646                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2647                         logger('Already forwarded', LOGGER_DEBUG);
2648                         return false;
2649                 }
2650
2651                 // Prevent to forward already forwarded posts
2652                 if ($datarray["app"] == $a->getHostName()) {
2653                         logger('Already forwarded (second test)', LOGGER_DEBUG);
2654                         return false;
2655                 }
2656
2657                 // Only forward posts
2658                 if ($datarray["verb"] != ACTIVITY_POST) {
2659                         logger('No post', LOGGER_DEBUG);
2660                         return false;
2661                 }
2662
2663                 if (($contact['network'] != Protocol::FEED) && $datarray['private']) {
2664                         logger('Not public', LOGGER_DEBUG);
2665                         return false;
2666                 }
2667
2668                 $datarray2 = $datarray;
2669                 logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
2670                 if ($contact['remote_self'] == 2) {
2671                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2672                                         ['uid' => $contact['uid'], 'self' => true]);
2673                         if (DBA::isResult($self)) {
2674                                 $datarray['contact-id'] = $self["id"];
2675
2676                                 $datarray['owner-name'] = $self["name"];
2677                                 $datarray['owner-link'] = $self["url"];
2678                                 $datarray['owner-avatar'] = $self["thumb"];
2679
2680                                 $datarray['author-name']   = $datarray['owner-name'];
2681                                 $datarray['author-link']   = $datarray['owner-link'];
2682                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2683
2684                                 unset($datarray['created']);
2685                                 unset($datarray['edited']);
2686
2687                                 unset($datarray['network']);
2688                                 unset($datarray['owner-id']);
2689                                 unset($datarray['author-id']);
2690                         }
2691
2692                         if ($contact['network'] != Protocol::FEED) {
2693                                 $datarray["guid"] = System::createUUID();
2694                                 unset($datarray["plink"]);
2695                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2696                                 $datarray["parent-uri"] = $datarray["uri"];
2697                                 $datarray["thr-parent"] = $datarray["uri"];
2698                                 $datarray["extid"] = Protocol::DFRN;
2699                                 $urlpart = parse_url($datarray2['author-link']);
2700                                 $datarray["app"] = $urlpart["host"];
2701                         } else {
2702                                 $datarray['private'] = 0;
2703                         }
2704                 }
2705
2706                 if ($contact['network'] != Protocol::FEED) {
2707                         // Store the original post
2708                         $result = self::insert($datarray2, false, false);
2709                         logger('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
2710                 } else {
2711                         $datarray["app"] = "Feed";
2712                         $result = true;
2713                 }
2714
2715                 // Trigger automatic reactions for addons
2716                 $datarray['api_source'] = true;
2717
2718                 // We have to tell the hooks who we are - this really should be improved
2719                 $_SESSION["authenticated"] = true;
2720                 $_SESSION["uid"] = $contact['uid'];
2721
2722                 return $result;
2723         }
2724
2725         /**
2726          *
2727          * @param string $s
2728          * @param int    $uid
2729          * @param array  $item
2730          * @param int    $cid
2731          * @return string
2732          */
2733         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2734         {
2735                 if (Config::get('system', 'disable_embedded')) {
2736                         return $s;
2737                 }
2738
2739                 logger('check for photos', LOGGER_DEBUG);
2740                 $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
2741
2742                 $orig_body = $s;
2743                 $new_body = '';
2744
2745                 $img_start = strpos($orig_body, '[img');
2746                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2747                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2748
2749                 while (($img_st_close !== false) && ($img_len !== false)) {
2750                         $img_st_close++; // make it point to AFTER the closing bracket
2751                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2752
2753                         logger('found photo ' . $image, LOGGER_DEBUG);
2754
2755                         if (stristr($image, $site . '/photo/')) {
2756                                 // Only embed locally hosted photos
2757                                 $replace = false;
2758                                 $i = basename($image);
2759                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2760                                 $x = strpos($i, '-');
2761
2762                                 if ($x) {
2763                                         $res = substr($i, $x + 1);
2764                                         $i = substr($i, 0, $x);
2765                                         $fields = ['data', 'type', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
2766                                         $photo = DBA::selectFirst('photo', $fields, ['resource-id' => $i, 'scale' => $res, 'uid' => $uid]);
2767                                         if (DBA::isResult($photo)) {
2768                                                 /*
2769                                                  * Check to see if we should replace this photo link with an embedded image
2770                                                  * 1. No need to do so if the photo is public
2771                                                  * 2. If there's a contact-id provided, see if they're in the access list
2772                                                  *    for the photo. If so, embed it.
2773                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2774                                                  *    permissions, regardless of order but first check to see if they're an exact
2775                                                  *    match to save some processing overhead.
2776                                                  */
2777                                                 if (self::hasPermissions($photo)) {
2778                                                         if ($cid) {
2779                                                                 $recips = self::enumeratePermissions($photo);
2780                                                                 if (in_array($cid, $recips)) {
2781                                                                         $replace = true;
2782                                                                 }
2783                                                         } elseif ($item) {
2784                                                                 if (self::samePermissions($item, $photo)) {
2785                                                                         $replace = true;
2786                                                                 }
2787                                                         }
2788                                                 }
2789                                                 if ($replace) {
2790                                                         $data = $photo['data'];
2791                                                         $type = $photo['type'];
2792
2793                                                         // If a custom width and height were specified, apply before embedding
2794                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2795                                                                 logger('scaling photo', LOGGER_DEBUG);
2796
2797                                                                 $width = intval($match[1]);
2798                                                                 $height = intval($match[2]);
2799
2800                                                                 $Image = new Image($data, $type);
2801                                                                 if ($Image->isValid()) {
2802                                                                         $Image->scaleDown(max($width, $height));
2803                                                                         $data = $Image->asString();
2804                                                                         $type = $Image->getType();
2805                                                                 }
2806                                                         }
2807
2808                                                         logger('replacing photo', LOGGER_DEBUG);
2809                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2810                                                         logger('replaced: ' . $image, LOGGER_DATA);
2811                                                 }
2812                                         }
2813                                 }
2814                         }
2815
2816                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2817                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2818                         if ($orig_body === false) {
2819                                 $orig_body = '';
2820                         }
2821
2822                         $img_start = strpos($orig_body, '[img');
2823                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2824                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2825                 }
2826
2827                 $new_body = $new_body . $orig_body;
2828
2829                 return $new_body;
2830         }
2831
2832         private static function hasPermissions($obj)
2833         {
2834                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2835                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2836         }
2837
2838         private static function samePermissions($obj1, $obj2)
2839         {
2840                 // first part is easy. Check that these are exactly the same.
2841                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2842                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2843                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2844                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2845                         return true;
2846                 }
2847
2848                 // This is harder. Parse all the permissions and compare the resulting set.
2849                 $recipients1 = self::enumeratePermissions($obj1);
2850                 $recipients2 = self::enumeratePermissions($obj2);
2851                 sort($recipients1);
2852                 sort($recipients2);
2853
2854                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2855                 return ($recipients1 == $recipients2);
2856         }
2857
2858         // returns an array of contact-ids that are allowed to see this object
2859         public static function enumeratePermissions($obj)
2860         {
2861                 $allow_people = expand_acl($obj['allow_cid']);
2862                 $allow_groups = Group::expand(expand_acl($obj['allow_gid']));
2863                 $deny_people  = expand_acl($obj['deny_cid']);
2864                 $deny_groups  = Group::expand(expand_acl($obj['deny_gid']));
2865                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2866                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2867                 $recipients   = array_diff($recipients, $deny);
2868                 return $recipients;
2869         }
2870
2871         public static function getFeedTags($item)
2872         {
2873                 $ret = [];
2874                 $matches = false;
2875                 $cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2876                 if ($cnt) {
2877                         for ($x = 0; $x < $cnt; $x ++) {
2878                                 if ($matches[1][$x]) {
2879                                         $ret[$matches[2][$x]] = ['#', $matches[1][$x], $matches[2][$x]];
2880                                 }
2881                         }
2882                 }
2883                 $matches = false;
2884                 $cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2885                 if ($cnt) {
2886                         for ($x = 0; $x < $cnt; $x ++) {
2887                                 if ($matches[1][$x]) {
2888                                         $ret[] = ['@', $matches[1][$x], $matches[2][$x]];
2889                                 }
2890                         }
2891                 }
2892                 return $ret;
2893         }
2894
2895         public static function expire($uid, $days, $network = "", $force = false)
2896         {
2897                 if (!$uid || ($days < 1)) {
2898                         return;
2899                 }
2900
2901                 $condition = ["`uid` = ? AND NOT `deleted` AND `id` = `parent` AND `gravity` = ?",
2902                         $uid, GRAVITY_PARENT];
2903
2904                 /*
2905                  * $expire_network_only = save your own wall posts
2906                  * and just expire conversations started by others
2907                  */
2908                 $expire_network_only = PConfig::get($uid, 'expire', 'network_only', false);
2909
2910                 if ($expire_network_only) {
2911                         $condition[0] .= " AND NOT `wall`";
2912                 }
2913
2914                 if ($network != "") {
2915                         $condition[0] .= " AND `network` = ?";
2916                         $condition[] = $network;
2917
2918                         /*
2919                          * There is an index "uid_network_received" but not "uid_network_created"
2920                          * This avoids the creation of another index just for one purpose.
2921                          * And it doesn't really matter wether to look at "received" or "created"
2922                          */
2923                         $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2924                         $condition[] = $days;
2925                 } else {
2926                         $condition[0] .= " AND `created` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2927                         $condition[] = $days;
2928                 }
2929
2930                 $items = self::select(['file', 'resource-id', 'starred', 'type', 'id', 'post-type'], $condition);
2931
2932                 if (!DBA::isResult($items)) {
2933                         return;
2934                 }
2935
2936                 $expire_items = PConfig::get($uid, 'expire', 'items', true);
2937
2938                 // Forcing expiring of items - but not notes and marked items
2939                 if ($force) {
2940                         $expire_items = true;
2941                 }
2942
2943                 $expire_notes = PConfig::get($uid, 'expire', 'notes', true);
2944                 $expire_starred = PConfig::get($uid, 'expire', 'starred', true);
2945                 $expire_photos = PConfig::get($uid, 'expire', 'photos', false);
2946
2947                 $expired = 0;
2948
2949                 while ($item = Item::fetch($items)) {
2950                         // don't expire filed items
2951
2952                         if (strpos($item['file'], '[') !== false) {
2953                                 continue;
2954                         }
2955
2956                         // Only expire posts, not photos and photo comments
2957
2958                         if (!$expire_photos && strlen($item['resource-id'])) {
2959                                 continue;
2960                         } elseif (!$expire_starred && intval($item['starred'])) {
2961                                 continue;
2962                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == Item::PT_PERSONAL_NOTE))) {
2963                                 continue;
2964                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != Item::PT_PERSONAL_NOTE)) {
2965                                 continue;
2966                         }
2967
2968                         self::deleteById($item['id'], PRIORITY_LOW);
2969
2970                         ++$expired;
2971                 }
2972                 DBA::close($items);
2973                 logger('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2974         }
2975
2976         public static function firstPostDate($uid, $wall = false)
2977         {
2978                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2979                 $params = ['order' => ['created' => false]];
2980                 $thread = DBA::selectFirst('thread', ['created'], $condition, $params);
2981                 if (DBA::isResult($thread)) {
2982                         return substr(DateTimeFormat::local($thread['created']), 0, 10);
2983                 }
2984                 return false;
2985         }
2986
2987         /**
2988          * @brief add/remove activity to an item
2989          *
2990          * Toggle activities as like,dislike,attend of an item
2991          *
2992          * @param string $item_id
2993          * @param string $verb
2994          *              Activity verb. One of
2995          *                      like, unlike, dislike, undislike, attendyes, unattendyes,
2996          *                      attendno, unattendno, attendmaybe, unattendmaybe
2997          * @hook 'post_local_end'
2998          *              array $arr
2999          *                      'post_id' => ID of posted item
3000          */
3001         public static function performLike($item_id, $verb)
3002         {
3003                 if (!local_user() && !remote_user()) {
3004                         return false;
3005                 }
3006
3007                 switch ($verb) {
3008                         case 'like':
3009                         case 'unlike':
3010                                 $activity = ACTIVITY_LIKE;
3011                                 break;
3012                         case 'dislike':
3013                         case 'undislike':
3014                                 $activity = ACTIVITY_DISLIKE;
3015                                 break;
3016                         case 'attendyes':
3017                         case 'unattendyes':
3018                                 $activity = ACTIVITY_ATTEND;
3019                                 break;
3020                         case 'attendno':
3021                         case 'unattendno':
3022                                 $activity = ACTIVITY_ATTENDNO;
3023                                 break;
3024                         case 'attendmaybe':
3025                         case 'unattendmaybe':
3026                                 $activity = ACTIVITY_ATTENDMAYBE;
3027                                 break;
3028                         default:
3029                                 logger('like: unknown verb ' . $verb . ' for item ' . $item_id);
3030                                 return false;
3031                 }
3032
3033                 // Enable activity toggling instead of on/off
3034                 $event_verb_flag = $activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE;
3035
3036                 logger('like: verb ' . $verb . ' item ' . $item_id);
3037
3038                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
3039                 if (!DBA::isResult($item)) {
3040                         logger('like: unknown item ' . $item_id);
3041                         return false;
3042                 }
3043
3044                 $item_uri = $item['uri'];
3045
3046                 $uid = $item['uid'];
3047                 if (($uid == 0) && local_user()) {
3048                         $uid = local_user();
3049                 }
3050
3051                 if (!can_write_wall($uid)) {
3052                         logger('like: unable to write on wall ' . $uid);
3053                         return false;
3054                 }
3055
3056                 // Retrieves the local post owner
3057                 $owner_self_contact = DBA::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
3058                 if (!DBA::isResult($owner_self_contact)) {
3059                         logger('like: unknown owner ' . $uid);
3060                         return false;
3061                 }
3062
3063                 // Retrieve the current logged in user's public contact
3064                 $author_id = public_contact();
3065
3066                 $author_contact = DBA::selectFirst('contact', ['url'], ['id' => $author_id]);
3067                 if (!DBA::isResult($author_contact)) {
3068                         logger('like: unknown author ' . $author_id);
3069                         return false;
3070                 }
3071
3072                 // Contact-id is the uid-dependant author contact
3073                 if (local_user() == $uid) {
3074                         $item_contact_id = $owner_self_contact['id'];
3075                         $item_contact = $owner_self_contact;
3076                 } else {
3077                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
3078                         $item_contact = DBA::selectFirst('contact', [], ['id' => $item_contact_id]);
3079                         if (!DBA::isResult($item_contact)) {
3080                                 logger('like: unknown item contact ' . $item_contact_id);
3081                                 return false;
3082                         }
3083                 }
3084
3085                 // Look for an existing verb row
3086                 // event participation are essentially radio toggles. If you make a subsequent choice,
3087                 // we need to eradicate your first choice.
3088                 if ($event_verb_flag) {
3089                         $verbs = [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE];
3090
3091                         // Translate to the index based activity index
3092                         $activities = [];
3093                         foreach ($verbs as $verb) {
3094                                 $activities[] = self::activityToIndex($verb);
3095                         }
3096                 } else {
3097                         $activities = self::activityToIndex($activity);
3098                 }
3099
3100                 $condition = ['activity' => $activities, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
3101                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent' => $item_uri];
3102
3103                 $like_item = self::selectFirst(['id', 'guid', 'verb'], $condition);
3104
3105                 // If it exists, mark it as deleted
3106                 if (DBA::isResult($like_item)) {
3107                         self::deleteById($like_item['id']);
3108
3109                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
3110                                 return true;
3111                         }
3112                 }
3113
3114                 // Verb is "un-something", just trying to delete existing entries
3115                 if (strpos($verb, 'un') === 0) {
3116                         return true;
3117                 }
3118
3119                 $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE;
3120
3121                 $new_item = [
3122                         'guid'          => System::createUUID(),
3123                         'uri'           => self::newURI($item['uid']),
3124                         'uid'           => $item['uid'],
3125                         'contact-id'    => $item_contact_id,
3126                         'wall'          => $item['wall'],
3127                         'origin'        => 1,
3128                         'network'       => Protocol::DFRN,
3129                         'gravity'       => GRAVITY_ACTIVITY,
3130                         'parent'        => $item['id'],
3131                         'parent-uri'    => $item['uri'],
3132                         'thr-parent'    => $item['uri'],
3133                         'owner-id'      => $author_id,
3134                         'author-id'     => $author_id,
3135                         'body'          => $activity,
3136                         'verb'          => $activity,
3137                         'object-type'   => $objtype,
3138                         'allow_cid'     => $item['allow_cid'],
3139                         'allow_gid'     => $item['allow_gid'],
3140                         'deny_cid'      => $item['deny_cid'],
3141                         'deny_gid'      => $item['deny_gid'],
3142                         'visible'       => 1,
3143                         'unseen'        => 1,
3144                 ];
3145
3146                 $new_item_id = self::insert($new_item);
3147
3148                 // If the parent item isn't visible then set it to visible
3149                 if (!$item['visible']) {
3150                         self::update(['visible' => true], ['id' => $item['id']]);
3151                 }
3152
3153                 // Save the author information for the like in case we need to relay to Diaspora
3154                 Diaspora::storeLikeSignature($item_contact, $new_item_id);
3155
3156                 $new_item['id'] = $new_item_id;
3157
3158                 Addon::callHooks('post_local_end', $new_item);
3159
3160                 Worker::add(PRIORITY_HIGH, "Notifier", "like", $new_item_id);
3161
3162                 return true;
3163         }
3164
3165         private static function addThread($itemid, $onlyshadow = false)
3166         {
3167                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
3168                         'moderated', 'visible', 'starred', 'contact-id', 'post-type',
3169                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
3170                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3171                 $item = self::selectFirst($fields, $condition);
3172
3173                 if (!DBA::isResult($item)) {
3174                         return;
3175                 }
3176
3177                 $item['iid'] = $itemid;
3178
3179                 if (!$onlyshadow) {
3180                         $result = DBA::insert('thread', $item);
3181
3182                         logger("Add thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
3183                 }
3184         }
3185
3186         private static function updateThread($itemid, $setmention = false)
3187         {
3188                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
3189                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id',
3190                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
3191                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3192
3193                 $item = self::selectFirst($fields, $condition);
3194                 if (!DBA::isResult($item)) {
3195                         return;
3196                 }
3197
3198                 if ($setmention) {
3199                         $item["mention"] = 1;
3200                 }
3201
3202                 $sql = "";
3203
3204                 $fields = [];
3205
3206                 foreach ($item as $field => $data) {
3207                         if (!in_array($field, ["guid"])) {
3208                                 $fields[$field] = $data;
3209                         }
3210                 }
3211
3212                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
3213
3214                 logger("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, LOGGER_DEBUG);
3215         }
3216
3217         private static function deleteThread($itemid, $itemuri = "")
3218         {
3219                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
3220                 if (!DBA::isResult($item)) {
3221                         logger('No thread found for id '.$itemid, LOGGER_DEBUG);
3222                         return;
3223                 }
3224
3225                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
3226
3227                 logger("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
3228
3229                 if ($itemuri != "") {
3230                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
3231                         if (!self::exists($condition)) {
3232                                 DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
3233                                 logger("deleteThread: Deleted shadow for item ".$itemuri, LOGGER_DEBUG);
3234                         }
3235                 }
3236         }
3237 }