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::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' => $item['id']]);
1083
1084                 if (!empty($item['iaid']) && !self::exists(['iaid' => $item['iaid'], 'deleted' => false])) {
1085                         DBA::delete('item-activity', ['id' => $item['iaid']], ['cascade' => false]);
1086                 }
1087                 if (!empty($item['icid']) && !self::exists(['icid' => $item['icid'], 'deleted' => false])) {
1088                         DBA::delete('item-content', ['id' => $item['icid']], ['cascade' => false]);
1089                 }
1090                 // When the permission set will be used in photo and events as well,
1091                 // this query here needs to be extended.
1092                 if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
1093                         DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
1094                 }
1095
1096                 // If it's the parent of a comment thread, kill all the kids
1097                 if ($item['id'] == $item['parent']) {
1098                         self::delete(['parent' => $item['parent'], 'deleted' => false], $priority);
1099                 }
1100
1101                 // Is it our comment and/or our thread?
1102                 if ($item['origin'] || $parent['origin']) {
1103
1104                         // When we delete the original post we will delete all existing copies on the server as well
1105                         self::delete(['uri' => $item['uri'], 'deleted' => false], $priority);
1106
1107                         // send the notification upstream/downstream
1108                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", "drop", intval($item['id']));
1109                 } elseif ($item['uid'] != 0) {
1110
1111                         // When we delete just our local user copy of an item, we have to set a marker to hide it
1112                         $global_item = self::selectFirst(['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
1113                         if (DBA::isResult($global_item)) {
1114                                 DBA::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
1115                         }
1116                 }
1117
1118                 logger('Item with ID ' . $item_id . " has been deleted.", LOGGER_DEBUG);
1119
1120                 return true;
1121         }
1122
1123         private static function deleteTagsFromItem($item)
1124         {
1125                 if (($item["verb"] != ACTIVITY_TAG) || ($item["object-type"] != ACTIVITY_OBJ_TAGTERM)) {
1126                         return;
1127                 }
1128
1129                 $xo = XML::parseString($item["object"], false);
1130                 $xt = XML::parseString($item["target"], false);
1131
1132                 if ($xt->type != ACTIVITY_OBJ_NOTE) {
1133                         return;
1134                 }
1135
1136                 $i = self::selectFirst(['id', 'contact-id', 'tag'], ['uri' => $xt->id, 'uid' => $item['uid']]);
1137                 if (!DBA::isResult($i)) {
1138                         return;
1139                 }
1140
1141                 // For tags, the owner cannot remove the tag on the author's copy of the post.
1142                 $owner_remove = ($item["contact-id"] == $i["contact-id"]);
1143                 $author_copy = $item["origin"];
1144
1145                 if (($owner_remove && $author_copy) || !$owner_remove) {
1146                         return;
1147                 }
1148
1149                 $tags = explode(',', $i["tag"]);
1150                 $newtags = [];
1151                 if (count($tags)) {
1152                         foreach ($tags as $tag) {
1153                                 if (trim($tag) !== trim($xo->body)) {
1154                                        $newtags[] = trim($tag);
1155                                 }
1156                         }
1157                 }
1158                 self::update(['tag' => implode(',', $newtags)], ['id' => $i["id"]]);
1159         }
1160
1161         private static function guid($item, $notify)
1162         {
1163                 if (!empty($item['guid'])) {
1164                         return notags(trim($item['guid']));
1165                 }
1166
1167                 if ($notify) {
1168                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
1169                         // We add the hash of our own host because our host is the original creator of the post.
1170                         $prefix_host = get_app()->get_hostname();
1171                 } else {
1172                         $prefix_host = '';
1173
1174                         // We are only storing the post so we create a GUID from the original hostname.
1175                         if (!empty($item['author-link'])) {
1176                                 $parsed = parse_url($item['author-link']);
1177                                 if (!empty($parsed['host'])) {
1178                                         $prefix_host = $parsed['host'];
1179                                 }
1180                         }
1181
1182                         if (empty($prefix_host) && !empty($item['plink'])) {
1183                                 $parsed = parse_url($item['plink']);
1184                                 if (!empty($parsed['host'])) {
1185                                         $prefix_host = $parsed['host'];
1186                                 }
1187                         }
1188
1189                         if (empty($prefix_host) && !empty($item['uri'])) {
1190                                 $parsed = parse_url($item['uri']);
1191                                 if (!empty($parsed['host'])) {
1192                                         $prefix_host = $parsed['host'];
1193                                 }
1194                         }
1195
1196                         // Is it in the format data@host.tld? - Used for mail contacts
1197                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
1198                                 $mailparts = explode('@', $item['author-link']);
1199                                 $prefix_host = array_pop($mailparts);
1200                         }
1201                 }
1202
1203                 if (!empty($item['plink'])) {
1204                         $guid = self::guidFromUri($item['plink'], $prefix_host);
1205                 } elseif (!empty($item['uri'])) {
1206                         $guid = self::guidFromUri($item['uri'], $prefix_host);
1207                 } else {
1208                         $guid = System::createGUID(32, hash('crc32', $prefix_host));
1209                 }
1210
1211                 return $guid;
1212         }
1213
1214         private static function contactId($item)
1215         {
1216                 $contact_id = (int)$item["contact-id"];
1217
1218                 if (!empty($contact_id)) {
1219                         return $contact_id;
1220                 }
1221                 logger('Missing contact-id. Called by: '.System::callstack(), LOGGER_DEBUG);
1222                 /*
1223                  * First we are looking for a suitable contact that matches with the author of the post
1224                  * This is done only for comments
1225                  */
1226                 if ($item['parent-uri'] != $item['uri']) {
1227                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
1228                 }
1229
1230                 // If not present then maybe the owner was found
1231                 if ($contact_id == 0) {
1232                         $contact_id = Contact::getIdForURL($item['owner-link'], $item['uid']);
1233                 }
1234
1235                 // Still missing? Then use the "self" contact of the current user
1236                 if ($contact_id == 0) {
1237                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $item['uid']]);
1238                         if (DBA::isResult($self)) {
1239                                 $contact_id = $self["id"];
1240                         }
1241                 }
1242                 logger("Contact-id was missing for post ".$item['guid']." from user id ".$item['uid']." - now set to ".$contact_id, LOGGER_DEBUG);
1243
1244                 return $contact_id;
1245         }
1246
1247         // This function will finally cover most of the preparation functionality in mod/item.php
1248         public static function prepare(&$item)
1249         {
1250                 $data = BBCode::getAttachmentData($item['body']);
1251                 if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $item['body'], $match, PREG_SET_ORDER) || isset($data["type"]))
1252                         && ($posttype != Item::PT_PERSONAL_NOTE)) {
1253                         $posttype = Item::PT_PAGE;
1254                         $objecttype = ACTIVITY_OBJ_BOOKMARK;
1255                 }
1256         }
1257
1258         public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
1259         {
1260                 $a = get_app();
1261
1262                 // If it is a posting where users should get notifications, then define it as wall posting
1263                 if ($notify) {
1264                         $item['wall'] = 1;
1265                         $item['origin'] = 1;
1266                         $item['network'] = Protocol::DFRN;
1267                         $item['protocol'] = Conversation::PARCEL_DFRN;
1268
1269                         if (is_int($notify)) {
1270                                 $priority = $notify;
1271                         } else {
1272                                 $priority = PRIORITY_HIGH;
1273                         }
1274                 } else {
1275                         $item['network'] = trim(defaults($item, 'network', Protocol::PHANTOM));
1276                 }
1277
1278                 $item['guid'] = self::guid($item, $notify);
1279                 $item['uri'] = notags(trim(defaults($item, 'uri', self::newURI($item['uid'], $item['guid']))));
1280
1281                 // Store URI data
1282                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
1283
1284                 // Store conversation data
1285                 $item = Conversation::insert($item);
1286
1287                 /*
1288                  * If a Diaspora signature structure was passed in, pull it out of the
1289                  * item array and set it aside for later storage.
1290                  */
1291
1292                 $dsprsig = null;
1293                 if (x($item, 'dsprsig')) {
1294                         $encoded_signature = $item['dsprsig'];
1295                         $dsprsig = json_decode(base64_decode($item['dsprsig']));
1296                         unset($item['dsprsig']);
1297                 }
1298
1299                 if (!empty($item['diaspora_signed_text'])) {
1300                         $diaspora_signed_text = $item['diaspora_signed_text'];
1301                         unset($item['diaspora_signed_text']);
1302                 } else {
1303                         $diaspora_signed_text = '';
1304                 }
1305
1306                 // Converting the plink
1307                 /// @TODO Check if this is really still needed
1308                 if ($item['network'] == Protocol::OSTATUS) {
1309                         if (isset($item['plink'])) {
1310                                 $item['plink'] = OStatus::convertHref($item['plink']);
1311                         } elseif (isset($item['uri'])) {
1312                                 $item['plink'] = OStatus::convertHref($item['uri']);
1313                         }
1314                 }
1315
1316                 if (!empty($item['thr-parent'])) {
1317                         $item['parent-uri'] = $item['thr-parent'];
1318                 }
1319
1320                 if (isset($item['gravity'])) {
1321                         $item['gravity'] = intval($item['gravity']);
1322                 } elseif ($item['parent-uri'] === $item['uri']) {
1323                         $item['gravity'] = GRAVITY_PARENT;
1324                 } elseif (activity_match($item['verb'], ACTIVITY_POST)) {
1325                         $item['gravity'] = GRAVITY_COMMENT;
1326                 } else {
1327                         $item['gravity'] = GRAVITY_UNKNOWN;   // Should not happen
1328                         logger('Unknown gravity for verb: ' . $item['verb'], LOGGER_DEBUG);
1329                 }
1330
1331                 $uid = intval($item['uid']);
1332
1333                 // check for create date and expire time
1334                 $expire_interval = Config::get('system', 'dbclean-expire-days', 0);
1335
1336                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $uid]);
1337                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
1338                         $expire_interval = $user['expire'];
1339                 }
1340
1341                 if (($expire_interval > 0) && !empty($item['created'])) {
1342                         $expire_date = time() - ($expire_interval * 86400);
1343                         $created_date = strtotime($item['created']);
1344                         if ($created_date < $expire_date) {
1345                                 logger('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), LOGGER_DEBUG);
1346                                 return 0;
1347                         }
1348                 }
1349
1350                 /*
1351                  * Do we already have this item?
1352                  * We have to check several networks since Friendica posts could be repeated
1353                  * via OStatus (maybe Diasporsa as well)
1354                  */
1355                 if (in_array($item['network'], [Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS, ""])) {
1356                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?)",
1357                                 trim($item['uri']), $item['uid'],
1358                                 Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
1359                         $existing = self::selectFirst(['id', 'network'], $condition);
1360                         if (DBA::isResult($existing)) {
1361                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
1362                                 if ($uid != 0) {
1363                                         logger("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
1364                                 }
1365
1366                                 return $existing["id"];
1367                         }
1368                 }
1369
1370                 // Ensure to always have the same creation date.
1371                 $existing = self::selectfirst(['created', 'uri-hash'], ['uri' => $item['uri']]);
1372                 if (DBA::isResult($existing)) {
1373                         $item['created'] = $existing['created'];
1374                         $item['uri-hash'] = $existing['uri-hash'];
1375                 }
1376
1377                 $item['wall']          = intval(defaults($item, 'wall', 0));
1378                 $item['extid']         = trim(defaults($item, 'extid', ''));
1379                 $item['author-name']   = trim(defaults($item, 'author-name', ''));
1380                 $item['author-link']   = trim(defaults($item, 'author-link', ''));
1381                 $item['author-avatar'] = trim(defaults($item, 'author-avatar', ''));
1382                 $item['owner-name']    = trim(defaults($item, 'owner-name', ''));
1383                 $item['owner-link']    = trim(defaults($item, 'owner-link', ''));
1384                 $item['owner-avatar']  = trim(defaults($item, 'owner-avatar', ''));
1385                 $item['received']      = ((x($item, 'received') !== false) ? DateTimeFormat::utc($item['received']) : DateTimeFormat::utcNow());
1386                 $item['created']       = ((x($item, 'created') !== false) ? DateTimeFormat::utc($item['created']) : $item['received']);
1387                 $item['edited']        = ((x($item, 'edited') !== false) ? DateTimeFormat::utc($item['edited']) : $item['created']);
1388                 $item['changed']       = ((x($item, 'changed') !== false) ? DateTimeFormat::utc($item['changed']) : $item['created']);
1389                 $item['commented']     = ((x($item, 'commented') !== false) ? DateTimeFormat::utc($item['commented']) : $item['created']);
1390                 $item['title']         = trim(defaults($item, 'title', ''));
1391                 $item['location']      = trim(defaults($item, 'location', ''));
1392                 $item['coord']         = trim(defaults($item, 'coord', ''));
1393                 $item['visible']       = ((x($item, 'visible') !== false) ? intval($item['visible'])         : 1);
1394                 $item['deleted']       = 0;
1395                 $item['parent-uri']    = trim(defaults($item, 'parent-uri', $item['uri']));
1396                 $item['post-type']     = defaults($item, 'post-type', self::PT_ARTICLE);
1397                 $item['verb']          = trim(defaults($item, 'verb', ''));
1398                 $item['object-type']   = trim(defaults($item, 'object-type', ''));
1399                 $item['object']        = trim(defaults($item, 'object', ''));
1400                 $item['target-type']   = trim(defaults($item, 'target-type', ''));
1401                 $item['target']        = trim(defaults($item, 'target', ''));
1402                 $item['plink']         = trim(defaults($item, 'plink', ''));
1403                 $item['allow_cid']     = trim(defaults($item, 'allow_cid', ''));
1404                 $item['allow_gid']     = trim(defaults($item, 'allow_gid', ''));
1405                 $item['deny_cid']      = trim(defaults($item, 'deny_cid', ''));
1406                 $item['deny_gid']      = trim(defaults($item, 'deny_gid', ''));
1407                 $item['private']       = intval(defaults($item, 'private', 0));
1408                 $item['body']          = trim(defaults($item, 'body', ''));
1409                 $item['tag']           = trim(defaults($item, 'tag', ''));
1410                 $item['attach']        = trim(defaults($item, 'attach', ''));
1411                 $item['app']           = trim(defaults($item, 'app', ''));
1412                 $item['origin']        = intval(defaults($item, 'origin', 0));
1413                 $item['postopts']      = trim(defaults($item, 'postopts', ''));
1414                 $item['resource-id']   = trim(defaults($item, 'resource-id', ''));
1415                 $item['event-id']      = intval(defaults($item, 'event-id', 0));
1416                 $item['inform']        = trim(defaults($item, 'inform', ''));
1417                 $item['file']          = trim(defaults($item, 'file', ''));
1418
1419                 // Unique identifier to be linked against item-activities and item-content
1420                 $item['uri-hash']      = defaults($item, 'uri-hash', self::itemHash($item['uri'], $item['created']));
1421
1422                 // When there is no content then we don't post it
1423                 if ($item['body'].$item['title'] == '') {
1424                         logger('No body, no title.');
1425                         return 0;
1426                 }
1427
1428                 self::addLanguageToItemArray($item);
1429
1430                 // Items cannot be stored before they happen ...
1431                 if ($item['created'] > DateTimeFormat::utcNow()) {
1432                         $item['created'] = DateTimeFormat::utcNow();
1433                 }
1434
1435                 // We haven't invented time travel by now.
1436                 if ($item['edited'] > DateTimeFormat::utcNow()) {
1437                         $item['edited'] = DateTimeFormat::utcNow();
1438                 }
1439
1440                 $item['plink'] = defaults($item, 'plink', System::baseUrl() . '/display/' . urlencode($item['guid']));
1441
1442                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
1443                 $item["contact-id"] = self::contactId($item);
1444
1445                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
1446                         'photo' => $item['author-avatar'], 'network' => $item['network']];
1447
1448                 $item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
1449
1450                 if (Contact::isBlocked($item["author-id"])) {
1451                         logger('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
1452                         return 0;
1453                 }
1454
1455                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
1456                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
1457
1458                 $item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
1459
1460                 if (Contact::isBlocked($item["owner-id"])) {
1461                         logger('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
1462                         return 0;
1463                 }
1464
1465                 if ($item['network'] == Protocol::PHANTOM) {
1466                         logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
1467
1468                         $item['network'] = Protocol::DFRN;
1469                         logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
1470                 }
1471
1472                 // Checking if there is already an item with the same guid
1473                 logger('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], LOGGER_DEBUG);
1474                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
1475                 if (self::exists($condition)) {
1476                         logger('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], LOGGER_DEBUG);
1477                         return 0;
1478                 }
1479
1480                 // Check for hashtags in the body and repair or add hashtag links
1481                 self::setHashtags($item);
1482
1483                 $item['thr-parent'] = $item['parent-uri'];
1484
1485                 $notify_type = '';
1486                 $allow_cid = '';
1487                 $allow_gid = '';
1488                 $deny_cid  = '';
1489                 $deny_gid  = '';
1490
1491                 if ($item['parent-uri'] === $item['uri']) {
1492                         $parent_id = 0;
1493                         $parent_deleted = 0;
1494                         $allow_cid = $item['allow_cid'];
1495                         $allow_gid = $item['allow_gid'];
1496                         $deny_cid  = $item['deny_cid'];
1497                         $deny_gid  = $item['deny_gid'];
1498                         $notify_type = 'wall-new';
1499                 } else {
1500                         // find the parent and snarf the item id and ACLs
1501                         // and anything else we need to inherit
1502
1503                         $fields = ['uri', 'parent-uri', 'id', 'deleted',
1504                                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
1505                                 'wall', 'private', 'forum_mode', 'origin'];
1506                         $condition = ['uri' => $item['parent-uri'], 'uid' => $item['uid']];
1507                         $params = ['order' => ['id' => false]];
1508                         $parent = self::selectFirst($fields, $condition, $params);
1509
1510                         if (DBA::isResult($parent)) {
1511                                 // is the new message multi-level threaded?
1512                                 // even though we don't support it now, preserve the info
1513                                 // and re-attach to the conversation parent.
1514
1515                                 if ($parent['uri'] != $parent['parent-uri']) {
1516                                         $item['parent-uri'] = $parent['parent-uri'];
1517
1518                                         $condition = ['uri' => $item['parent-uri'],
1519                                                 'parent-uri' => $item['parent-uri'],
1520                                                 'uid' => $item['uid']];
1521                                         $params = ['order' => ['id' => false]];
1522                                         $toplevel_parent = self::selectFirst($fields, $condition, $params);
1523
1524                                         if (DBA::isResult($toplevel_parent)) {
1525                                                 $parent = $toplevel_parent;
1526                                         }
1527                                 }
1528
1529                                 $parent_id      = $parent['id'];
1530                                 $parent_deleted = $parent['deleted'];
1531                                 $allow_cid      = $parent['allow_cid'];
1532                                 $allow_gid      = $parent['allow_gid'];
1533                                 $deny_cid       = $parent['deny_cid'];
1534                                 $deny_gid       = $parent['deny_gid'];
1535                                 $item['wall']    = $parent['wall'];
1536                                 $notify_type    = 'comment-new';
1537
1538                                 /*
1539                                  * If the parent is private, force privacy for the entire conversation
1540                                  * This differs from the above settings as it subtly allows comments from
1541                                  * email correspondents to be private even if the overall thread is not.
1542                                  */
1543                                 if ($parent['private']) {
1544                                         $item['private'] = $parent['private'];
1545                                 }
1546
1547                                 /*
1548                                  * Edge case. We host a public forum that was originally posted to privately.
1549                                  * The original author commented, but as this is a comment, the permissions
1550                                  * weren't fixed up so it will still show the comment as private unless we fix it here.
1551                                  */
1552                                 if ((intval($parent['forum_mode']) == 1) && $parent['private']) {
1553                                         $item['private'] = 0;
1554                                 }
1555
1556                                 // If its a post from myself then tag the thread as "mention"
1557                                 logger("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], LOGGER_DEBUG);
1558                                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
1559                                 if (DBA::isResult($user)) {
1560                                         $self = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
1561                                         $self_id = Contact::getIdForURL($self, 0, true);
1562                                         logger("'myself' is ".$self_id." for parent ".$parent_id." checking against ".$item['author-id']." and ".$item['owner-id'], LOGGER_DEBUG);
1563                                         if (($item['author-id'] == $self_id) || ($item['owner-id'] == $self_id)) {
1564                                                 DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
1565                                                 logger("tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
1566                                         }
1567                                 }
1568                         } else {
1569                                 /*
1570                                  * Allow one to see reply tweets from status.net even when
1571                                  * we don't have or can't see the original post.
1572                                  */
1573                                 if ($force_parent) {
1574                                         logger('$force_parent=true, reply converted to top-level post.');
1575                                         $parent_id = 0;
1576                                         $item['parent-uri'] = $item['uri'];
1577                                         $item['gravity'] = GRAVITY_PARENT;
1578                                 } else {
1579                                         logger('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
1580                                         return 0;
1581                                 }
1582
1583                                 $parent_deleted = 0;
1584                         }
1585                 }
1586
1587                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
1588                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
1589
1590                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
1591                         $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
1592                 if (self::exists($condition)) {
1593                         logger('duplicated item with the same uri found. '.print_r($item,true));
1594                         return 0;
1595                 }
1596
1597                 // On Friendica and Diaspora the GUID is unique
1598                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
1599                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
1600                         if (self::exists($condition)) {
1601                                 logger('duplicated item with the same guid found. '.print_r($item,true));
1602                                 return 0;
1603                         }
1604                 } else {
1605                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
1606                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
1607                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
1608                         if (self::exists($condition)) {
1609                                 logger('duplicated item with the same body found. '.print_r($item,true));
1610                                 return 0;
1611                         }
1612                 }
1613
1614                 // Is this item available in the global items (with uid=0)?
1615                 if ($item["uid"] == 0) {
1616                         $item["global"] = true;
1617
1618                         // Set the global flag on all items if this was a global item entry
1619                         self::update(['global' => true], ['uri' => $item["uri"]]);
1620                 } else {
1621                         $item["global"] = self::exists(['uid' => 0, 'uri' => $item["uri"]]);
1622                 }
1623
1624                 // ACL settings
1625                 if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
1626                         $private = 1;
1627                 } else {
1628                         $private = $item['private'];
1629                 }
1630
1631                 $item["allow_cid"] = $allow_cid;
1632                 $item["allow_gid"] = $allow_gid;
1633                 $item["deny_cid"] = $deny_cid;
1634                 $item["deny_gid"] = $deny_gid;
1635                 $item["private"] = $private;
1636                 $item["deleted"] = $parent_deleted;
1637
1638                 // Fill the cache field
1639                 put_item_in_cache($item);
1640
1641                 if ($notify) {
1642                         $item['edit'] = false;
1643                         $item['parent'] = $parent_id;
1644                         Addon::callHooks('post_local', $item);
1645                         unset($item['edit']);
1646                         unset($item['parent']);
1647                 } else {
1648                         Addon::callHooks('post_remote', $item);
1649                 }
1650
1651                 // This array field is used to trigger some automatic reactions
1652                 // It is mainly used in the "post_local" hook.
1653                 unset($item['api_source']);
1654
1655                 if (x($item, 'cancel')) {
1656                         logger('post cancelled by addon.');
1657                         return 0;
1658                 }
1659
1660                 /*
1661                  * Check for already added items.
1662                  * There is a timing issue here that sometimes creates double postings.
1663                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
1664                  */
1665                 if ($item["uid"] == 0) {
1666                         if (self::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
1667                                 logger('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], LOGGER_DEBUG);
1668                                 return 0;
1669                         }
1670                 }
1671
1672                 logger('' . print_r($item,true), LOGGER_DATA);
1673
1674                 if (array_key_exists('tag', $item)) {
1675                         $tags = $item['tag'];
1676                         unset($item['tag']);
1677                 } else {
1678                         $tags = '';
1679                 }
1680
1681                 if (array_key_exists('file', $item)) {
1682                         $files = $item['file'];
1683                         unset($item['file']);
1684                 } else {
1685                         $files = '';
1686                 }
1687
1688                 // Creates or assigns the permission set
1689                 $item['psid'] = PermissionSet::fetchIDForPost($item);
1690
1691                 // We are doing this outside of the transaction to avoid timing problems
1692                 if (!self::insertActivity($item)) {
1693                         self::insertContent($item);
1694                 }
1695
1696                 $delivery_data = ['postopts' => defaults($item, 'postopts', ''),
1697                         'inform' => defaults($item, 'inform', '')];
1698
1699                 unset($item['postopts']);
1700                 unset($item['inform']);
1701
1702                 // These fields aren't stored anymore in the item table, they are fetched upon request
1703                 unset($item['author-link']);
1704                 unset($item['author-name']);
1705                 unset($item['author-avatar']);
1706
1707                 unset($item['owner-link']);
1708                 unset($item['owner-name']);
1709                 unset($item['owner-avatar']);
1710
1711                 DBA::transaction();
1712                 $ret = DBA::insert('item', $item);
1713
1714                 // When the item was successfully stored we fetch the ID of the item.
1715                 if (DBA::isResult($ret)) {
1716                         $current_post = DBA::lastInsertId();
1717                 } else {
1718                         // This can happen - for example - if there are locking timeouts.
1719                         DBA::rollback();
1720
1721                         // Store the data into a spool file so that we can try again later.
1722
1723                         // At first we restore the Diaspora signature that we removed above.
1724                         if (isset($encoded_signature)) {
1725                                 $item['dsprsig'] = $encoded_signature;
1726                         }
1727
1728                         // Now we store the data in the spool directory
1729                         // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
1730                         $file = 'item-'.round(microtime(true) * 10000).'-'.mt_rand().'.msg';
1731
1732                         $spoolpath = get_spoolpath();
1733                         if ($spoolpath != "") {
1734                                 $spool = $spoolpath.'/'.$file;
1735
1736                                 // Ensure to have the removed data from above again in the item array
1737                                 $item = array_merge($item, $delivery_data);
1738
1739                                 file_put_contents($spool, json_encode($item));
1740                                 logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
1741                         }
1742                         return 0;
1743                 }
1744
1745                 if ($current_post == 0) {
1746                         // This is one of these error messages that never should occur.
1747                         logger("couldn't find created item - we better quit now.");
1748                         DBA::rollback();
1749                         return 0;
1750                 }
1751
1752                 // How much entries have we created?
1753                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
1754                 $entries = DBA::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
1755
1756                 if ($entries > 1) {
1757                         // There are duplicates. We delete our just created entry.
1758                         logger('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
1759
1760                         // Yes, we could do a rollback here - but we are having many users with MyISAM.
1761                         DBA::delete('item', ['id' => $current_post]);
1762                         DBA::commit();
1763                         return 0;
1764                 } elseif ($entries == 0) {
1765                         // This really should never happen since we quit earlier if there were problems.
1766                         logger("Something is terribly wrong. We haven't found our created entry.");
1767                         DBA::rollback();
1768                         return 0;
1769                 }
1770
1771                 logger('created item '.$current_post);
1772                 self::updateContact($item);
1773
1774                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
1775                         $parent_id = $current_post;
1776                 }
1777
1778                 // Set parent id
1779                 self::update(['parent' => $parent_id], ['id' => $current_post]);
1780
1781                 $item['id'] = $current_post;
1782                 $item['parent'] = $parent_id;
1783
1784                 // update the commented timestamp on the parent
1785                 // Only update "commented" if it is really a comment
1786                 if (($item['gravity'] != GRAVITY_ACTIVITY) || !Config::get("system", "like_no_comment")) {
1787                         self::update(['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1788                 } else {
1789                         self::update(['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1790                 }
1791
1792                 if ($dsprsig) {
1793                         /*
1794                          * Friendica servers lower than 3.4.3-2 had double encoded the signature ...
1795                          * We can check for this condition when we decode and encode the stuff again.
1796                          */
1797                         if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
1798                                 $dsprsig->signature = base64_decode($dsprsig->signature);
1799                                 logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
1800                         }
1801
1802                         DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
1803                                                 'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
1804                 }
1805
1806                 if (!empty($diaspora_signed_text)) {
1807                         // Formerly we stored the signed text, the signature and the author in different fields.
1808                         // We now store the raw data so that we are more flexible.
1809                         DBA::insert('sign', ['iid' => $current_post, 'signed_text' => $diaspora_signed_text]);
1810                 }
1811
1812                 $deleted = self::tagDeliver($item['uid'], $current_post);
1813
1814                 /*
1815                  * current post can be deleted if is for a community page and no mention are
1816                  * in it.
1817                  */
1818                 if (!$deleted && !$dontcache) {
1819                         $posted_item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1820                         if (DBA::isResult($posted_item)) {
1821                                 if ($notify) {
1822                                         Addon::callHooks('post_local_end', $posted_item);
1823                                 } else {
1824                                         Addon::callHooks('post_remote_end', $posted_item);
1825                                 }
1826                         } else {
1827                                 logger('new item not found in DB, id ' . $current_post);
1828                         }
1829                 }
1830
1831                 if ($item['parent-uri'] === $item['uri']) {
1832                         self::addThread($current_post);
1833                 } else {
1834                         self::updateThread($parent_id);
1835                 }
1836
1837                 $delivery_data['iid'] = $current_post;
1838
1839                 self::insertDeliveryData($delivery_data);
1840
1841                 DBA::commit();
1842
1843                 /*
1844                  * Due to deadlock issues with the "term" table we are doing these steps after the commit.
1845                  * This is not perfect - but a workable solution until we found the reason for the problem.
1846                  */
1847                 if (!empty($tags)) {
1848                         Term::insertFromTagFieldByItemId($current_post, $tags);
1849                 }
1850
1851                 if (!empty($files)) {
1852                         Term::insertFromFileFieldByItemId($current_post, $files);
1853                 }
1854
1855                 if ($item['parent-uri'] === $item['uri']) {
1856                         self::addShadow($current_post);
1857                 } else {
1858                         self::addShadowPost($current_post);
1859                 }
1860
1861                 check_user_notification($current_post);
1862
1863                 if ($notify) {
1864                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", $notify_type, $current_post);
1865                 } elseif (!empty($parent) && $parent['origin']) {
1866                         Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "Notifier", "comment-import", $current_post);
1867                 }
1868
1869                 return $current_post;
1870         }
1871
1872         /**
1873          * @brief Insert a new item delivery data entry
1874          *
1875          * @param array $item The item fields that are to be inserted
1876          */
1877         private static function insertDeliveryData($delivery_data)
1878         {
1879                 if (empty($delivery_data['iid']) || (empty($delivery_data['postopts']) && empty($delivery_data['inform']))) {
1880                         return;
1881                 }
1882
1883                 DBA::insert('item-delivery-data', $delivery_data);
1884         }
1885
1886         /**
1887          * @brief Update an existing item delivery data entry
1888          *
1889          * @param integer $id The item id that is to be updated
1890          * @param array $item The item fields that are to be inserted
1891          */
1892         private static function updateDeliveryData($id, $delivery_data)
1893         {
1894                 if (empty($id) || (empty($delivery_data['postopts']) && empty($delivery_data['inform']))) {
1895                         return;
1896                 }
1897
1898                 DBA::update('item-delivery-data', $delivery_data, ['iid' => $id], true);
1899         }
1900
1901         /**
1902          * @brief Insert a new item content entry
1903          *
1904          * @param array $item The item fields that are to be inserted
1905          */
1906         private static function insertActivity(&$item)
1907         {
1908                 $activity_index = self::activityToIndex($item['verb']);
1909
1910                 if ($activity_index < 0) {
1911                         return false;
1912                 }
1913
1914                 $fields = ['uri' => $item['uri'], 'activity' => $activity_index,
1915                         'uri-hash' => $item['uri-hash'], 'uri-id' => $item['uri-id']];
1916
1917                 // We just remove everything that is content
1918                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1919                         unset($item[$field]);
1920                 }
1921
1922                 // To avoid timing problems, we are using locks.
1923                 $locked = Lock::acquire('item_insert_activity');
1924                 if (!$locked) {
1925                         logger("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
1926                 }
1927
1928                 // Do we already have this content?
1929                 $item_activity = DBA::selectFirst('item-activity', ['id'], ['uri-hash' => $item['uri-hash']]);
1930                 if (DBA::isResult($item_activity)) {
1931                         $item['iaid'] = $item_activity['id'];
1932                         logger('Fetched activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
1933                 } elseif (DBA::insert('item-activity', $fields)) {
1934                         $item['iaid'] = DBA::lastInsertId();
1935                         logger('Inserted activity for URI ' . $item['uri'] . ' (' . $item['iaid'] . ')');
1936                 } else {
1937                         // This shouldn't happen.
1938                         logger('Could not insert activity for URI ' . $item['uri'] . ' - should not happen');
1939                         return false;
1940                 }
1941                 if ($locked) {
1942                         Lock::release('item_insert_activity');
1943                 }
1944                 return true;
1945         }
1946
1947         /**
1948          * @brief Insert a new item content entry
1949          *
1950          * @param array $item The item fields that are to be inserted
1951          */
1952         private static function insertContent(&$item)
1953         {
1954                 $fields = ['uri' => $item['uri'], 'uri-plink-hash' => $item['uri-hash'],
1955                         'uri-id' => $item['uri-id']];
1956
1957                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1958                         if (isset($item[$field])) {
1959                                 $fields[$field] = $item[$field];
1960                                 unset($item[$field]);
1961                         }
1962                 }
1963
1964                 // To avoid timing problems, we are using locks.
1965                 $locked = Lock::acquire('item_insert_content');
1966                 if (!$locked) {
1967                         logger("Couldn't acquire lock for URI " . $item['uri'] . " - proceeding anyway.");
1968                 }
1969
1970                 // Do we already have this content?
1971                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-plink-hash' => $item['uri-hash']]);
1972                 if (DBA::isResult($item_content)) {
1973                         $item['icid'] = $item_content['id'];
1974                         logger('Fetched content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
1975                 } elseif (DBA::insert('item-content', $fields)) {
1976                         $item['icid'] = DBA::lastInsertId();
1977                         logger('Inserted content for URI ' . $item['uri'] . ' (' . $item['icid'] . ')');
1978                 } else {
1979                         // This shouldn't happen.
1980                         logger('Could not insert content for URI ' . $item['uri'] . ' - should not happen');
1981                 }
1982                 if ($locked) {
1983                         Lock::release('item_insert_content');
1984                 }
1985         }
1986
1987         /**
1988          * @brief Update existing item content entries
1989          *
1990          * @param array $item The item fields that are to be changed
1991          * @param array $condition The condition for finding the item content entries
1992          */
1993         private static function updateActivity($item, $condition)
1994         {
1995                 if (empty($item['verb'])) {
1996                         return false;
1997                 }
1998                 $activity_index = self::activityToIndex($item['verb']);
1999
2000                 if ($activity_index < 0) {
2001                         return false;
2002                 }
2003
2004                 $fields = ['activity' => $activity_index];
2005
2006                 logger('Update activity for ' . json_encode($condition));
2007
2008                 DBA::update('item-activity', $fields, $condition, true);
2009
2010                 return true;
2011         }
2012
2013         /**
2014          * @brief Update existing item content entries
2015          *
2016          * @param array $item The item fields that are to be changed
2017          * @param array $condition The condition for finding the item content entries
2018          */
2019         private static function updateContent($item, $condition)
2020         {
2021                 // We have to select only the fields from the "item-content" table
2022                 $fields = [];
2023                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
2024                         if (isset($item[$field])) {
2025                                 $fields[$field] = $item[$field];
2026                         }
2027                 }
2028
2029                 if (empty($fields)) {
2030                         // when there are no fields at all, just use the condition
2031                         // This is to ensure that we always store content.
2032                         $fields = $condition;
2033                 }
2034
2035                 logger('Update content for ' . json_encode($condition));
2036
2037                 DBA::update('item-content', $fields, $condition, true);
2038         }
2039
2040         /**
2041          * @brief Distributes public items to the receivers
2042          *
2043          * @param integer $itemid      Item ID that should be added
2044          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
2045          */
2046         public static function distribute($itemid, $signed_text = '')
2047         {
2048                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
2049                 $parent = self::selectFirst(['owner-id'], $condition);
2050                 if (!DBA::isResult($parent)) {
2051                         return;
2052                 }
2053
2054                 // Only distribute public items from native networks
2055                 $condition = ['id' => $itemid, 'uid' => 0,
2056                         'network' => [Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS, ""],
2057                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
2058                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2059                 if (!DBA::isResult($item)) {
2060                         return;
2061                 }
2062
2063                 $origin = $item['origin'];
2064
2065                 unset($item['id']);
2066                 unset($item['parent']);
2067                 unset($item['mention']);
2068                 unset($item['wall']);
2069                 unset($item['origin']);
2070                 unset($item['starred']);
2071
2072                 $users = [];
2073
2074                 $condition = ["`nurl` IN (SELECT `nurl` FROM `contact` WHERE `id` = ?) AND `uid` != 0 AND NOT `blocked` AND `rel` IN (?, ?)",
2075                         $parent['owner-id'], Contact::SHARING,  Contact::FRIEND];
2076
2077                 $contacts = DBA::select('contact', ['uid'], $condition);
2078
2079                 while ($contact = DBA::fetch($contacts)) {
2080                         $users[$contact['uid']] = $contact['uid'];
2081                 }
2082
2083                 $origin_uid = 0;
2084
2085                 if ($item['uri'] != $item['parent-uri']) {
2086                         $parents = self::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
2087                         while ($parent = self::fetch($parents)) {
2088                                 $users[$parent['uid']] = $parent['uid'];
2089                                 if ($parent['origin'] && !$origin) {
2090                                         $origin_uid = $parent['uid'];
2091                                 }
2092                         }
2093                 }
2094
2095                 foreach ($users as $uid) {
2096                         if ($origin_uid == $uid) {
2097                                 $item['diaspora_signed_text'] = $signed_text;
2098                         }
2099                         self::storeForUser($itemid, $item, $uid);
2100                 }
2101         }
2102
2103         /**
2104          * @brief Store public items for the receivers
2105          *
2106          * @param integer $itemid Item ID that should be added
2107          * @param array   $item   The item entry that will be stored
2108          * @param integer $uid    The user that will receive the item entry
2109          */
2110         private static function storeForUser($itemid, $item, $uid)
2111         {
2112                 $item['uid'] = $uid;
2113                 $item['origin'] = 0;
2114                 $item['wall'] = 0;
2115                 if ($item['uri'] == $item['parent-uri']) {
2116                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
2117                 } else {
2118                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
2119                 }
2120
2121                 if (empty($item['contact-id'])) {
2122                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
2123                         if (!DBA::isResult($self)) {
2124                                 return;
2125                         }
2126                         $item['contact-id'] = $self['id'];
2127                 }
2128
2129                 /// @todo Handling of "event-id"
2130
2131                 $notify = false;
2132                 if ($item['uri'] == $item['parent-uri']) {
2133                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
2134                         if (DBA::isResult($contact)) {
2135                                 $notify = self::isRemoteSelf($contact, $item);
2136                         }
2137                 }
2138
2139                 $distributed = self::insert($item, false, $notify, true);
2140
2141                 if (!$distributed) {
2142                         logger("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", LOGGER_DEBUG);
2143                 } else {
2144                         logger("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, LOGGER_DEBUG);
2145                 }
2146         }
2147
2148         /**
2149          * @brief Add a shadow entry for a given item id that is a thread starter
2150          *
2151          * We store every public item entry additionally with the user id "0".
2152          * This is used for the community page and for the search.
2153          * It is planned that in the future we will store public item entries only once.
2154          *
2155          * @param integer $itemid Item ID that should be added
2156          */
2157         public static function addShadow($itemid)
2158         {
2159                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri'];
2160                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
2161                 $item = self::selectFirst($fields, $condition);
2162
2163                 if (!DBA::isResult($item)) {
2164                         return;
2165                 }
2166
2167                 // is it already a copy?
2168                 if (($itemid == 0) || ($item['uid'] == 0)) {
2169                         return;
2170                 }
2171
2172                 // Is it a visible public post?
2173                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || $item["private"]) {
2174                         return;
2175                 }
2176
2177                 // is it an entry from a connector? Only add an entry for natively connected networks
2178                 if (!in_array($item["network"], [Protocol::DFRN, Protocol::DIASPORA, Protocol::OSTATUS, ""])) {
2179                         return;
2180                 }
2181
2182                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2183                         return;
2184                 }
2185
2186                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2187
2188                 if (DBA::isResult($item)) {
2189                         // Preparing public shadow (removing user specific data)
2190                         $item['uid'] = 0;
2191                         unset($item['id']);
2192                         unset($item['parent']);
2193                         unset($item['wall']);
2194                         unset($item['mention']);
2195                         unset($item['origin']);
2196                         unset($item['starred']);
2197                         unset($item['postopts']);
2198                         unset($item['inform']);
2199                         if ($item['uri'] == $item['parent-uri']) {
2200                                 $item['contact-id'] = $item['owner-id'];
2201                         } else {
2202                                 $item['contact-id'] = $item['author-id'];
2203                         }
2204
2205                         $public_shadow = self::insert($item, false, false, true);
2206
2207                         logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
2208                 }
2209         }
2210
2211         /**
2212          * @brief Add a shadow entry for a given item id that is a comment
2213          *
2214          * This function does the same like the function above - but for comments
2215          *
2216          * @param integer $itemid Item ID that should be added
2217          */
2218         public static function addShadowPost($itemid)
2219         {
2220                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2221                 if (!DBA::isResult($item)) {
2222                         return;
2223                 }
2224
2225                 // Is it a toplevel post?
2226                 if ($item['id'] == $item['parent']) {
2227                         self::addShadow($itemid);
2228                         return;
2229                 }
2230
2231                 // Is this a shadow entry?
2232                 if ($item['uid'] == 0) {
2233                         return;
2234                 }
2235
2236                 // Is there a shadow parent?
2237                 if (!self::exists(['uri' => $item['parent-uri'], 'uid' => 0])) {
2238                         return;
2239                 }
2240
2241                 // Is there already a shadow entry?
2242                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2243                         return;
2244                 }
2245
2246                 // Save "origin" and "parent" state
2247                 $origin = $item['origin'];
2248                 $parent = $item['parent'];
2249
2250                 // Preparing public shadow (removing user specific data)
2251                 $item['uid'] = 0;
2252                 unset($item['id']);
2253                 unset($item['parent']);
2254                 unset($item['wall']);
2255                 unset($item['mention']);
2256                 unset($item['origin']);
2257                 unset($item['starred']);
2258                 unset($item['postopts']);
2259                 unset($item['inform']);
2260                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
2261
2262                 $public_shadow = self::insert($item, false, false, true);
2263
2264                 logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);
2265
2266                 // If this was a comment to a Diaspora post we don't get our comment back.
2267                 // This means that we have to distribute the comment by ourselves.
2268                 if ($origin && self::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
2269                         self::distribute($public_shadow);
2270                 }
2271         }
2272
2273          /**
2274          * Adds a language specification in a "language" element of given $arr.
2275          * Expects "body" element to exist in $arr.
2276          */
2277         private static function addLanguageToItemArray(&$item)
2278         {
2279                 $naked_body = BBCode::toPlaintext($item['body'], false);
2280
2281                 $ld = new Text_LanguageDetect();
2282                 $ld->setNameMode(2);
2283                 $languages = $ld->detect($naked_body, 3);
2284
2285                 if (is_array($languages)) {
2286                         $item['language'] = json_encode($languages);
2287                 }
2288         }
2289
2290         /**
2291          * @brief Creates an unique guid out of a given uri
2292          *
2293          * @param string $uri uri of an item entry
2294          * @param string $host hostname for the GUID prefix
2295          * @return string unique guid
2296          */
2297         public static function guidFromUri($uri, $host)
2298         {
2299                 // Our regular guid routine is using this kind of prefix as well
2300                 // We have to avoid that different routines could accidentally create the same value
2301                 $parsed = parse_url($uri);
2302
2303                 // We use a hash of the hostname as prefix for the guid
2304                 $guid_prefix = hash("crc32", $host);
2305
2306                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
2307                 unset($parsed["scheme"]);
2308
2309                 // Glue it together to be able to make a hash from it
2310                 $host_id = implode("/", $parsed);
2311
2312                 // We could use any hash algorithm since it isn't a security issue
2313                 $host_hash = hash("ripemd128", $host_id);
2314
2315                 return $guid_prefix.$host_hash;
2316         }
2317
2318         /**
2319          * generate an unique URI
2320          *
2321          * @param integer $uid User id
2322          * @param string $guid An existing GUID (Otherwise it will be generated)
2323          *
2324          * @return string
2325          */
2326         public static function newURI($uid, $guid = "")
2327         {
2328                 if ($guid == "") {
2329                         $guid = System::createGUID(32);
2330                 }
2331
2332                 $hostname = self::getApp()->get_hostname();
2333
2334                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $uid]);
2335
2336                 $uri = "urn:X-dfrn:" . $hostname . ':' . $user['nickname'] . ':' . $guid;
2337
2338                 return $uri;
2339         }
2340
2341         /**
2342          * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
2343          *
2344          * This can be used to filter for inactive contacts.
2345          * Only do this for public postings to avoid privacy problems, since poco data is public.
2346          * Don't set this value if it isn't from the owner (could be an author that we don't know)
2347          *
2348          * @param array $arr Contains the just posted item record
2349          */
2350         private static function updateContact($arr)
2351         {
2352                 // Unarchive the author
2353                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
2354                 if (DBA::isResult($contact)) {
2355                         Contact::unmarkForArchival($contact);
2356                 }
2357
2358                 // Unarchive the contact if it's not our own contact
2359                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
2360                 if (DBA::isResult($contact)) {
2361                         Contact::unmarkForArchival($contact);
2362                 }
2363
2364                 $update = (!$arr['private'] && ((defaults($arr, 'author-link', '') === defaults($arr, 'owner-link', '')) || ($arr["parent-uri"] === $arr["uri"])));
2365
2366                 // Is it a forum? Then we don't care about the rules from above
2367                 if (!$update && ($arr["network"] == Protocol::DFRN) && ($arr["parent-uri"] === $arr["uri"])) {
2368                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
2369                                 $update = true;
2370                         }
2371                 }
2372
2373                 if ($update) {
2374                         DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2375                                 ['id' => $arr['contact-id']]);
2376                 }
2377                 // Now do the same for the system wide contacts with uid=0
2378                 if (!$arr['private']) {
2379                         DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2380                                 ['id' => $arr['owner-id']]);
2381
2382                         if ($arr['owner-id'] != $arr['author-id']) {
2383                                 DBA::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
2384                                         ['id' => $arr['author-id']]);
2385                         }
2386                 }
2387         }
2388
2389         public static function setHashtags(&$item)
2390         {
2391
2392                 $tags = get_tags($item["body"]);
2393
2394                 // No hashtags?
2395                 if (!count($tags)) {
2396                         return false;
2397                 }
2398
2399                 // This sorting is important when there are hashtags that are part of other hashtags
2400                 // Otherwise there could be problems with hashtags like #test and #test2
2401                 rsort($tags);
2402
2403                 $URLSearchString = "^\[\]";
2404
2405                 // All hashtags should point to the home server if "local_tags" is activated
2406                 if (Config::get('system', 'local_tags')) {
2407                         $item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2408                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["body"]);
2409
2410                         $item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2411                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["tag"]);
2412                 }
2413
2414                 // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
2415                 $item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2416                         function ($match) {
2417                                 return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
2418                         }, $item["body"]);
2419
2420                 $item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
2421                         function ($match) {
2422                                 return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
2423                         }, $item["body"]);
2424
2425                 $item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
2426                         function ($match) {
2427                                 return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
2428                         }, $item["body"]);
2429
2430                 // Repair recursive urls
2431                 $item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2432                                 "&num;$2", $item["body"]);
2433
2434                 foreach ($tags as $tag) {
2435                         if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=')) {
2436                                 continue;
2437                         }
2438
2439                         $basetag = str_replace('_',' ',substr($tag,1));
2440
2441                         $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . rawurlencode($basetag) . ']' . $basetag . '[/url]';
2442
2443                         $item["body"] = str_replace($tag, $newtag, $item["body"]);
2444
2445                         if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
2446                                 if (strlen($item["tag"])) {
2447                                         $item["tag"] = ','.$item["tag"];
2448                                 }
2449                                 $item["tag"] = $newtag.$item["tag"];
2450                         }
2451                 }
2452
2453                 // Convert back the masked hashtags
2454                 $item["body"] = str_replace("&num;", "#", $item["body"]);
2455         }
2456
2457         public static function getGuidById($id)
2458         {
2459                 $item = self::selectFirst(['guid'], ['id' => $id]);
2460                 if (DBA::isResult($item)) {
2461                         return $item['guid'];
2462                 } else {
2463                         return '';
2464                 }
2465         }
2466
2467         /**
2468          * This function is only used for the old Friendica app on Android that doesn't like paths with guid
2469          * @param string $guid item guid
2470          * @param int    $uid  user id
2471          * @return array with id and nick of the item with the given guid
2472          */
2473         public static function getIdAndNickByGuid($guid, $uid = 0)
2474         {
2475                 $nick = "";
2476                 $id = 0;
2477
2478                 if ($uid == 0) {
2479                         $uid == local_user();
2480                 }
2481
2482                 // Does the given user have this item?
2483                 if ($uid) {
2484                         $item = self::selectFirst(['id'], ['guid' => $guid, 'uid' => $uid]);
2485                         if (DBA::isResult($item)) {
2486                                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $uid]);
2487                                 if (!DBA::isResult($user)) {
2488                                         return;
2489                                 }
2490                                 $id = $item['id'];
2491                                 $nick = $user['nickname'];
2492                         }
2493                 }
2494
2495                 // Or is it anywhere on the server?
2496                 if ($nick == "") {
2497                         $condition = ["`guid` = ? AND `uid` != 0", $guid];
2498                         $item = self::selectFirst(['id', 'uid'], $condition);
2499                         if (DBA::isResult($item)) {
2500                                 $user = DBA::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
2501                                 if (!DBA::isResult($user)) {
2502                                         return;
2503                                 }
2504                                 $id = $item['id'];
2505                                 $nick = $user['nickname'];
2506                         }
2507                 }
2508                 return ["nick" => $nick, "id" => $id];
2509         }
2510
2511         /**
2512          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
2513          * @param int $uid
2514          * @param int $item_id
2515          * @return bool true if item was deleted, else false
2516          */
2517         private static function tagDeliver($uid, $item_id)
2518         {
2519                 $mention = false;
2520
2521                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
2522                 if (!DBA::isResult($user)) {
2523                         return;
2524                 }
2525
2526                 $community_page = (($user['page-flags'] == Contact::PAGE_COMMUNITY) ? true : false);
2527                 $prvgroup = (($user['page-flags'] == Contact::PAGE_PRVGROUP) ? true : false);
2528
2529                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2530                 if (!DBA::isResult($item)) {
2531                         return;
2532                 }
2533
2534                 $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
2535
2536                 /*
2537                  * Diaspora uses their own hardwired link URL in @-tags
2538                  * instead of the one we supply with webfinger
2539                  */
2540                 $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
2541
2542                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2543                 if ($cnt) {
2544                         foreach ($matches as $mtch) {
2545                                 if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
2546                                         $mention = true;
2547                                         logger('mention found: ' . $mtch[2]);
2548                                 }
2549                         }
2550                 }
2551
2552                 if (!$mention) {
2553                         if (($community_page || $prvgroup) &&
2554                                   !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
2555                                 // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
2556                                 // delete it!
2557                                 logger("no-mention top-level post to community or private group. delete.");
2558                                 DBA::delete('item', ['id' => $item_id]);
2559                                 return true;
2560                         }
2561                         return;
2562                 }
2563
2564                 $arr = ['item' => $item, 'user' => $user];
2565
2566                 Addon::callHooks('tagged', $arr);
2567
2568                 if (!$community_page && !$prvgroup) {
2569                         return;
2570                 }
2571
2572                 /*
2573                  * tgroup delivery - setup a second delivery chain
2574                  * prevent delivery looping - only proceed
2575                  * if the message originated elsewhere and is a top-level post
2576                  */
2577                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2578                         return;
2579                 }
2580
2581                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2582                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2583                 if (!DBA::isResult($self)) {
2584                         return;
2585                 }
2586
2587                 $owner_id = Contact::getIdForURL($self['url']);
2588
2589                 // also reset all the privacy bits to the forum default permissions
2590
2591                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
2592
2593                 $psid = PermissionSet::fetchIDForPost($user);
2594
2595                 $forum_mode = ($prvgroup ? 2 : 1);
2596
2597                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2598                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2599                 self::update($fields, ['id' => $item_id]);
2600
2601                 self::updateThread($item_id);
2602
2603                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', 'tgroup', $item_id);
2604         }
2605
2606         public static function isRemoteSelf($contact, &$datarray)
2607         {
2608                 $a = get_app();
2609
2610                 if (!$contact['remote_self']) {
2611                         return false;
2612                 }
2613
2614                 // Prevent the forwarding of posts that are forwarded
2615                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2616                         logger('Already forwarded', LOGGER_DEBUG);
2617                         return false;
2618                 }
2619
2620                 // Prevent to forward already forwarded posts
2621                 if ($datarray["app"] == $a->get_hostname()) {
2622                         logger('Already forwarded (second test)', LOGGER_DEBUG);
2623                         return false;
2624                 }
2625
2626                 // Only forward posts
2627                 if ($datarray["verb"] != ACTIVITY_POST) {
2628                         logger('No post', LOGGER_DEBUG);
2629                         return false;
2630                 }
2631
2632                 if (($contact['network'] != Protocol::FEED) && $datarray['private']) {
2633                         logger('Not public', LOGGER_DEBUG);
2634                         return false;
2635                 }
2636
2637                 $datarray2 = $datarray;
2638                 logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
2639                 if ($contact['remote_self'] == 2) {
2640                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2641                                         ['uid' => $contact['uid'], 'self' => true]);
2642                         if (DBA::isResult($self)) {
2643                                 $datarray['contact-id'] = $self["id"];
2644
2645                                 $datarray['owner-name'] = $self["name"];
2646                                 $datarray['owner-link'] = $self["url"];
2647                                 $datarray['owner-avatar'] = $self["thumb"];
2648
2649                                 $datarray['author-name']   = $datarray['owner-name'];
2650                                 $datarray['author-link']   = $datarray['owner-link'];
2651                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2652
2653                                 unset($datarray['created']);
2654                                 unset($datarray['edited']);
2655
2656                                 unset($datarray['network']);
2657                                 unset($datarray['owner-id']);
2658                                 unset($datarray['author-id']);
2659                         }
2660
2661                         if ($contact['network'] != Protocol::FEED) {
2662                                 $datarray["guid"] = System::createGUID(32);
2663                                 unset($datarray["plink"]);
2664                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2665                                 $datarray["parent-uri"] = $datarray["uri"];
2666                                 $datarray["thr-parent"] = $datarray["uri"];
2667                                 $datarray["extid"] = Protocol::DFRN;
2668                                 $urlpart = parse_url($datarray2['author-link']);
2669                                 $datarray["app"] = $urlpart["host"];
2670                         } else {
2671                                 $datarray['private'] = 0;
2672                         }
2673                 }
2674
2675                 if ($contact['network'] != Protocol::FEED) {
2676                         // Store the original post
2677                         $result = self::insert($datarray2, false, false);
2678                         logger('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
2679                 } else {
2680                         $datarray["app"] = "Feed";
2681                         $result = true;
2682                 }
2683
2684                 // Trigger automatic reactions for addons
2685                 $datarray['api_source'] = true;
2686
2687                 // We have to tell the hooks who we are - this really should be improved
2688                 $_SESSION["authenticated"] = true;
2689                 $_SESSION["uid"] = $contact['uid'];
2690
2691                 return $result;
2692         }
2693
2694         /**
2695          *
2696          * @param string $s
2697          * @param int    $uid
2698          * @param array  $item
2699          * @param int    $cid
2700          * @return string
2701          */
2702         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2703         {
2704                 if (Config::get('system', 'disable_embedded')) {
2705                         return $s;
2706                 }
2707
2708                 logger('check for photos', LOGGER_DEBUG);
2709                 $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
2710
2711                 $orig_body = $s;
2712                 $new_body = '';
2713
2714                 $img_start = strpos($orig_body, '[img');
2715                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2716                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2717
2718                 while (($img_st_close !== false) && ($img_len !== false)) {
2719                         $img_st_close++; // make it point to AFTER the closing bracket
2720                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2721
2722                         logger('found photo ' . $image, LOGGER_DEBUG);
2723
2724                         if (stristr($image, $site . '/photo/')) {
2725                                 // Only embed locally hosted photos
2726                                 $replace = false;
2727                                 $i = basename($image);
2728                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2729                                 $x = strpos($i, '-');
2730
2731                                 if ($x) {
2732                                         $res = substr($i, $x + 1);
2733                                         $i = substr($i, 0, $x);
2734                                         $fields = ['data', 'type', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
2735                                         $photo = DBA::selectFirst('photo', $fields, ['resource-id' => $i, 'scale' => $res, 'uid' => $uid]);
2736                                         if (DBA::isResult($photo)) {
2737                                                 /*
2738                                                  * Check to see if we should replace this photo link with an embedded image
2739                                                  * 1. No need to do so if the photo is public
2740                                                  * 2. If there's a contact-id provided, see if they're in the access list
2741                                                  *    for the photo. If so, embed it.
2742                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2743                                                  *    permissions, regardless of order but first check to see if they're an exact
2744                                                  *    match to save some processing overhead.
2745                                                  */
2746                                                 if (self::hasPermissions($photo)) {
2747                                                         if ($cid) {
2748                                                                 $recips = self::enumeratePermissions($photo);
2749                                                                 if (in_array($cid, $recips)) {
2750                                                                         $replace = true;
2751                                                                 }
2752                                                         } elseif ($item) {
2753                                                                 if (self::samePermissions($item, $photo)) {
2754                                                                         $replace = true;
2755                                                                 }
2756                                                         }
2757                                                 }
2758                                                 if ($replace) {
2759                                                         $data = $photo['data'];
2760                                                         $type = $photo['type'];
2761
2762                                                         // If a custom width and height were specified, apply before embedding
2763                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2764                                                                 logger('scaling photo', LOGGER_DEBUG);
2765
2766                                                                 $width = intval($match[1]);
2767                                                                 $height = intval($match[2]);
2768
2769                                                                 $Image = new Image($data, $type);
2770                                                                 if ($Image->isValid()) {
2771                                                                         $Image->scaleDown(max($width, $height));
2772                                                                         $data = $Image->asString();
2773                                                                         $type = $Image->getType();
2774                                                                 }
2775                                                         }
2776
2777                                                         logger('replacing photo', LOGGER_DEBUG);
2778                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2779                                                         logger('replaced: ' . $image, LOGGER_DATA);
2780                                                 }
2781                                         }
2782                                 }
2783                         }
2784
2785                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2786                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2787                         if ($orig_body === false) {
2788                                 $orig_body = '';
2789                         }
2790
2791                         $img_start = strpos($orig_body, '[img');
2792                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2793                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2794                 }
2795
2796                 $new_body = $new_body . $orig_body;
2797
2798                 return $new_body;
2799         }
2800
2801         private static function hasPermissions($obj)
2802         {
2803                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2804                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2805         }
2806
2807         private static function samePermissions($obj1, $obj2)
2808         {
2809                 // first part is easy. Check that these are exactly the same.
2810                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2811                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2812                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2813                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2814                         return true;
2815                 }
2816
2817                 // This is harder. Parse all the permissions and compare the resulting set.
2818                 $recipients1 = self::enumeratePermissions($obj1);
2819                 $recipients2 = self::enumeratePermissions($obj2);
2820                 sort($recipients1);
2821                 sort($recipients2);
2822
2823                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2824                 return ($recipients1 == $recipients2);
2825         }
2826
2827         // returns an array of contact-ids that are allowed to see this object
2828         private static function enumeratePermissions($obj)
2829         {
2830                 $allow_people = expand_acl($obj['allow_cid']);
2831                 $allow_groups = Group::expand(expand_acl($obj['allow_gid']));
2832                 $deny_people  = expand_acl($obj['deny_cid']);
2833                 $deny_groups  = Group::expand(expand_acl($obj['deny_gid']));
2834                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2835                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2836                 $recipients   = array_diff($recipients, $deny);
2837                 return $recipients;
2838         }
2839
2840         public static function getFeedTags($item)
2841         {
2842                 $ret = [];
2843                 $matches = false;
2844                 $cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2845                 if ($cnt) {
2846                         for ($x = 0; $x < $cnt; $x ++) {
2847                                 if ($matches[1][$x]) {
2848                                         $ret[$matches[2][$x]] = ['#', $matches[1][$x], $matches[2][$x]];
2849                                 }
2850                         }
2851                 }
2852                 $matches = false;
2853                 $cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
2854                 if ($cnt) {
2855                         for ($x = 0; $x < $cnt; $x ++) {
2856                                 if ($matches[1][$x]) {
2857                                         $ret[] = ['@', $matches[1][$x], $matches[2][$x]];
2858                                 }
2859                         }
2860                 }
2861                 return $ret;
2862         }
2863
2864         public static function expire($uid, $days, $network = "", $force = false)
2865         {
2866                 if (!$uid || ($days < 1)) {
2867                         return;
2868                 }
2869
2870                 $condition = ["`uid` = ? AND NOT `deleted` AND `id` = `parent` AND `gravity` = ?",
2871                         $uid, GRAVITY_PARENT];
2872
2873                 /*
2874                  * $expire_network_only = save your own wall posts
2875                  * and just expire conversations started by others
2876                  */
2877                 $expire_network_only = PConfig::get($uid, 'expire', 'network_only', false);
2878
2879                 if ($expire_network_only) {
2880                         $condition[0] .= " AND NOT `wall`";
2881                 }
2882
2883                 if ($network != "") {
2884                         $condition[0] .= " AND `network` = ?";
2885                         $condition[] = $network;
2886
2887                         /*
2888                          * There is an index "uid_network_received" but not "uid_network_created"
2889                          * This avoids the creation of another index just for one purpose.
2890                          * And it doesn't really matter wether to look at "received" or "created"
2891                          */
2892                         $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2893                         $condition[] = $days;
2894                 } else {
2895                         $condition[0] .= " AND `created` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2896                         $condition[] = $days;
2897                 }
2898
2899                 $items = self::select(['file', 'resource-id', 'starred', 'type', 'id', 'post-type'], $condition);
2900
2901                 if (!DBA::isResult($items)) {
2902                         return;
2903                 }
2904
2905                 $expire_items = PConfig::get($uid, 'expire', 'items', true);
2906
2907                 // Forcing expiring of items - but not notes and marked items
2908                 if ($force) {
2909                         $expire_items = true;
2910                 }
2911
2912                 $expire_notes = PConfig::get($uid, 'expire', 'notes', true);
2913                 $expire_starred = PConfig::get($uid, 'expire', 'starred', true);
2914                 $expire_photos = PConfig::get($uid, 'expire', 'photos', false);
2915
2916                 $expired = 0;
2917
2918                 while ($item = Item::fetch($items)) {
2919                         // don't expire filed items
2920
2921                         if (strpos($item['file'], '[') !== false) {
2922                                 continue;
2923                         }
2924
2925                         // Only expire posts, not photos and photo comments
2926
2927                         if (!$expire_photos && strlen($item['resource-id'])) {
2928                                 continue;
2929                         } elseif (!$expire_starred && intval($item['starred'])) {
2930                                 continue;
2931                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == Item::PT_PERSONAL_NOTE))) {
2932                                 continue;
2933                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != Item::PT_PERSONAL_NOTE)) {
2934                                 continue;
2935                         }
2936
2937                         self::deleteById($item['id'], PRIORITY_LOW);
2938
2939                         ++$expired;
2940                 }
2941                 DBA::close($items);
2942                 logger('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2943         }
2944
2945         public static function firstPostDate($uid, $wall = false)
2946         {
2947                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2948                 $params = ['order' => ['created' => false]];
2949                 $thread = DBA::selectFirst('thread', ['created'], $condition, $params);
2950                 if (DBA::isResult($thread)) {
2951                         return substr(DateTimeFormat::local($thread['created']), 0, 10);
2952                 }
2953                 return false;
2954         }
2955
2956         /**
2957          * @brief add/remove activity to an item
2958          *
2959          * Toggle activities as like,dislike,attend of an item
2960          *
2961          * @param string $item_id
2962          * @param string $verb
2963          *              Activity verb. One of
2964          *                      like, unlike, dislike, undislike, attendyes, unattendyes,
2965          *                      attendno, unattendno, attendmaybe, unattendmaybe
2966          * @hook 'post_local_end'
2967          *              array $arr
2968          *                      'post_id' => ID of posted item
2969          */
2970         public static function performLike($item_id, $verb)
2971         {
2972                 if (!local_user() && !remote_user()) {
2973                         return false;
2974                 }
2975
2976                 switch ($verb) {
2977                         case 'like':
2978                         case 'unlike':
2979                                 $activity = ACTIVITY_LIKE;
2980                                 break;
2981                         case 'dislike':
2982                         case 'undislike':
2983                                 $activity = ACTIVITY_DISLIKE;
2984                                 break;
2985                         case 'attendyes':
2986                         case 'unattendyes':
2987                                 $activity = ACTIVITY_ATTEND;
2988                                 break;
2989                         case 'attendno':
2990                         case 'unattendno':
2991                                 $activity = ACTIVITY_ATTENDNO;
2992                                 break;
2993                         case 'attendmaybe':
2994                         case 'unattendmaybe':
2995                                 $activity = ACTIVITY_ATTENDMAYBE;
2996                                 break;
2997                         default:
2998                                 logger('like: unknown verb ' . $verb . ' for item ' . $item_id);
2999                                 return false;
3000                 }
3001
3002                 // Enable activity toggling instead of on/off
3003                 $event_verb_flag = $activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE;
3004
3005                 logger('like: verb ' . $verb . ' item ' . $item_id);
3006
3007                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
3008                 if (!DBA::isResult($item)) {
3009                         logger('like: unknown item ' . $item_id);
3010                         return false;
3011                 }
3012
3013                 $item_uri = $item['uri'];
3014
3015                 $uid = $item['uid'];
3016                 if (($uid == 0) && local_user()) {
3017                         $uid = local_user();
3018                 }
3019
3020                 if (!can_write_wall($uid)) {
3021                         logger('like: unable to write on wall ' . $uid);
3022                         return false;
3023                 }
3024
3025                 // Retrieves the local post owner
3026                 $owner_self_contact = DBA::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
3027                 if (!DBA::isResult($owner_self_contact)) {
3028                         logger('like: unknown owner ' . $uid);
3029                         return false;
3030                 }
3031
3032                 // Retrieve the current logged in user's public contact
3033                 $author_id = public_contact();
3034
3035                 $author_contact = DBA::selectFirst('contact', ['url'], ['id' => $author_id]);
3036                 if (!DBA::isResult($author_contact)) {
3037                         logger('like: unknown author ' . $author_id);
3038                         return false;
3039                 }
3040
3041                 // Contact-id is the uid-dependant author contact
3042                 if (local_user() == $uid) {
3043                         $item_contact_id = $owner_self_contact['id'];
3044                         $item_contact = $owner_self_contact;
3045                 } else {
3046                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
3047                         $item_contact = DBA::selectFirst('contact', [], ['id' => $item_contact_id]);
3048                         if (!DBA::isResult($item_contact)) {
3049                                 logger('like: unknown item contact ' . $item_contact_id);
3050                                 return false;
3051                         }
3052                 }
3053
3054                 // Look for an existing verb row
3055                 // event participation are essentially radio toggles. If you make a subsequent choice,
3056                 // we need to eradicate your first choice.
3057                 if ($event_verb_flag) {
3058                         $verbs = [ACTIVITY_ATTEND, ACTIVITY_ATTENDNO, ACTIVITY_ATTENDMAYBE];
3059
3060                         // Translate to the index based activity index
3061                         $activities = [];
3062                         foreach ($verbs as $verb) {
3063                                 $activities[] = self::activityToIndex($verb);
3064                         }
3065                 } else {
3066                         $activities = self::activityToIndex($activity);
3067                 }
3068
3069                 $condition = ['activity' => $activities, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
3070                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent' => $item_uri];
3071
3072                 $like_item = self::selectFirst(['id', 'guid', 'verb'], $condition);
3073
3074                 // If it exists, mark it as deleted
3075                 if (DBA::isResult($like_item)) {
3076                         self::deleteById($like_item['id']);
3077
3078                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
3079                                 return true;
3080                         }
3081                 }
3082
3083                 // Verb is "un-something", just trying to delete existing entries
3084                 if (strpos($verb, 'un') === 0) {
3085                         return true;
3086                 }
3087
3088                 $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE ;
3089
3090                 $new_item = [
3091                         'guid'          => System::createGUID(32),
3092                         'uri'           => self::newURI($item['uid']),
3093                         'uid'           => $item['uid'],
3094                         'contact-id'    => $item_contact_id,
3095                         'wall'          => $item['wall'],
3096                         'origin'        => 1,
3097                         'network'       => Protocol::DFRN,
3098                         'gravity'       => GRAVITY_ACTIVITY,
3099                         'parent'        => $item['id'],
3100                         'parent-uri'    => $item['uri'],
3101                         'thr-parent'    => $item['uri'],
3102                         'owner-id'      => $item['owner-id'],
3103                         'author-id'     => $author_id,
3104                         'body'          => $activity,
3105                         'verb'          => $activity,
3106                         'object-type'   => $objtype,
3107                         'allow_cid'     => $item['allow_cid'],
3108                         'allow_gid'     => $item['allow_gid'],
3109                         'deny_cid'      => $item['deny_cid'],
3110                         'deny_gid'      => $item['deny_gid'],
3111                         'visible'       => 1,
3112                         'unseen'        => 1,
3113                 ];
3114
3115                 $new_item_id = self::insert($new_item);
3116
3117                 // If the parent item isn't visible then set it to visible
3118                 if (!$item['visible']) {
3119                         self::update(['visible' => true], ['id' => $item['id']]);
3120                 }
3121
3122                 // Save the author information for the like in case we need to relay to Diaspora
3123                 Diaspora::storeLikeSignature($item_contact, $new_item_id);
3124
3125                 $new_item['id'] = $new_item_id;
3126
3127                 Addon::callHooks('post_local_end', $new_item);
3128
3129                 Worker::add(PRIORITY_HIGH, "Notifier", "like", $new_item_id);
3130
3131                 return true;
3132         }
3133
3134         private static function addThread($itemid, $onlyshadow = false)
3135         {
3136                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
3137                         'moderated', 'visible', 'starred', 'contact-id', 'post-type',
3138                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
3139                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3140                 $item = self::selectFirst($fields, $condition);
3141
3142                 if (!DBA::isResult($item)) {
3143                         return;
3144                 }
3145
3146                 $item['iid'] = $itemid;
3147
3148                 if (!$onlyshadow) {
3149                         $result = DBA::insert('thread', $item);
3150
3151                         logger("Add thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
3152                 }
3153         }
3154
3155         private static function updateThread($itemid, $setmention = false)
3156         {
3157                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
3158                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id',
3159                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
3160                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3161
3162                 $item = self::selectFirst($fields, $condition);
3163                 if (!DBA::isResult($item)) {
3164                         return;
3165                 }
3166
3167                 if ($setmention) {
3168                         $item["mention"] = 1;
3169                 }
3170
3171                 $sql = "";
3172
3173                 $fields = [];
3174
3175                 foreach ($item as $field => $data) {
3176                         if (!in_array($field, ["guid"])) {
3177                                 $fields[$field] = $data;
3178                         }
3179                 }
3180
3181                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
3182
3183                 logger("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, LOGGER_DEBUG);
3184         }
3185
3186         private static function deleteThread($itemid, $itemuri = "")
3187         {
3188                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
3189                 if (!DBA::isResult($item)) {
3190                         logger('No thread found for id '.$itemid, LOGGER_DEBUG);
3191                         return;
3192                 }
3193
3194                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
3195
3196                 logger("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
3197
3198                 if ($itemuri != "") {
3199                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
3200                         if (!self::exists($condition)) {
3201                                 DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
3202                                 logger("deleteThread: Deleted shadow for item ".$itemuri, LOGGER_DEBUG);
3203                         }
3204                 }
3205         }
3206 }