src/Model/Item.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use Friendica\Content\Text\BBCode;
  25 use Friendica\Content\Text\HTML;
  26 use Friendica\Core\Hook;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\Renderer;
  30 use Friendica\Core\Session;
  31 use Friendica\Core\System;
  32 use Friendica\Core\Worker;
  33 use Friendica\Database\DBA;
  34 use Friendica\Database\DBStructure;
  35 use Friendica\DI;
  36 use Friendica\Model\Post\Category;
  37 use Friendica\Protocol\Activity;
  38 use Friendica\Protocol\ActivityPub;
  39 use Friendica\Protocol\Diaspora;
  40 use Friendica\Util\DateTimeFormat;
  41 use Friendica\Util\Map;
  42 use Friendica\Util\Network;
  43 use Friendica\Util\Security;
  44 use Friendica\Util\Strings;
  45 use Friendica\Worker\Delivery;
  46 use Text_LanguageDetect;
  47 use Friendica\Repository\PermissionSet as RepPermissionSet;
  48
  49 class Item
  50 {
  51         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  52         const PT_ARTICLE = 0;
  53         const PT_NOTE = 1;
  54         const PT_PAGE = 2;
  55         const PT_IMAGE = 16;
  56         const PT_AUDIO = 17;
  57         const PT_VIDEO = 18;
  58         const PT_DOCUMENT = 19;
  59         const PT_EVENT = 32;
  60         const PT_PERSONAL_NOTE = 128;
  61
  62         // Field list that is used to display the items
  63         const DISPLAY_FIELDLIST = [
  64                 'uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network', 'gravity',
  65                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  66                 'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'attach', 'language',
  67                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  68                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  69                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  70                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
  71                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  72                 'writable', 'self', 'cid', 'alias', 'pinned',
  73                 'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  74                 'event-summary', 'event-desc', 'event-location', 'event-type',
  75                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  76                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  77         ];
  78
  79         // Field list that is used to deliver items via the protocols
  80         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  81                         'parent-guid', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  82                         'private', 'title', 'body', 'location', 'coord', 'app',
  83                         'attach', 'deleted', 'extid', 'post-type', 'gravity',
  84                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  85                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  86                         'signed_text', 'signature', 'signer', 'network'];
  87
  88         // Field list for "item-content" table that is mixed with the item table
  89         const MIXED_CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
  90                         'coord', 'app', 'rendered-hash', 'rendered-html', 'verb',
  91                         'object-type', 'object', 'target-type', 'target', 'plink'];
  92
  93         // Field list for "item-content" table that is not present in the "item" table
  94         const CONTENT_FIELDLIST = ['language'];
  95
  96         // All fields in the item table
  97         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
  98                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
  99                         'contact-id', 'type', 'wall', 'gravity', 'extid', 'icid', 'psid',
 100                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 101                         'postopts', 'plink', 'resource-id', 'event-id', 'attach', 'inform',
 102                         'file', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
 103                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 104                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 105                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 106                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 107                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 108                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar'];
 109
 110         // List of all verbs that don't need additional content data.
 111         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 112         const ACTIVITIES = [
 113                 Activity::LIKE, Activity::DISLIKE,
 114                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 115                 Activity::FOLLOW,
 116                 Activity::ANNOUNCE];
 117
 118         const PUBLIC = 0;
 119         const PRIVATE = 1;
 120         const UNLISTED = 2;
 121
 122         const TABLES = ['item', 'user-item', 'item-content', 'post-delivery-data', 'diaspora-interaction'];
 123
 124         private static $legacy_mode = null;
 125
 126         private static function getItemFields()
 127         {
 128                 $definition = DBStructure::definition('', false);
 129
 130                 $postfields = [];
 131                 foreach (self::TABLES as $table) {
 132                         $postfields[$table] = array_keys($definition[$table]['fields']);
 133                 }
 134
 135                 return $postfields;
 136         }
 137
 138         public static function isLegacyMode()
 139         {
 140                 if (is_null(self::$legacy_mode)) {
 141                         self::$legacy_mode = (DI::config()->get("system", "post_update_version") < 1279);
 142                 }
 143
 144                 return self::$legacy_mode;
 145         }
 146
 147         /**
 148          * Set the pinned state of an item
 149          *
 150          * @param integer $iid    Item ID
 151          * @param integer $uid    User ID
 152          * @param boolean $pinned Pinned state
 153          */
 154         public static function setPinned(int $iid, int $uid, bool $pinned)
 155         {
 156                 DBA::update('user-item', ['pinned' => $pinned], ['iid' => $iid, 'uid' => $uid], true);
 157         }
 158
 159         /**
 160          * Get the pinned state
 161          *
 162          * @param integer $iid Item ID
 163          * @param integer $uid User ID
 164          *
 165          * @return boolean pinned state
 166          */
 167         public static function getPinned(int $iid, int $uid)
 168         {
 169                 $useritem = DBA::selectFirst('user-item', ['pinned'], ['iid' => $iid, 'uid' => $uid]);
 170                 if (!DBA::isResult($useritem)) {
 171                         return false;
 172                 }
 173                 return (bool)$useritem['pinned'];
 174         }
 175
 176         /**
 177          * Select pinned rows from the item table for a given user
 178          *
 179          * @param integer $uid       User ID
 180          * @param array   $selected  Array of selected fields, empty for all
 181          * @param array   $condition Array of fields for condition
 182          * @param array   $params    Array of several parameters
 183          *
 184          * @return boolean|object
 185          * @throws \Exception
 186          */
 187         public static function selectPinned(int $uid, array $selected = [], array $condition = [], $params = [])
 188         {
 189                 $useritems = DBA::select('user-item', ['iid'], ['uid' => $uid, 'pinned' => true]);
 190                 if (!DBA::isResult($useritems)) {
 191                         return $useritems;
 192                 }
 193
 194                 $pinned = [];
 195                 while ($useritem = DBA::fetch($useritems)) {
 196                         $pinned[] = $useritem['iid'];
 197                 }
 198                 DBA::close($useritems);
 199
 200                 if (empty($pinned)) {
 201                         return [];
 202                 }
 203
 204                 if (empty($condition) || !is_array($condition)) {
 205                         $condition = ['iid' => $pinned];
 206                 } else {
 207                         reset($condition);
 208                         $first_key = key($condition);
 209                         if (!is_int($first_key)) {
 210                                 $condition['iid'] = $pinned;
 211                         } else {
 212                                 $values_string = substr(str_repeat("?, ", count($pinned)), 0, -2);
 213                                 $condition[0] = '(' . $condition[0] . ") AND `iid` IN (" . $values_string . ")";
 214                                 $condition = array_merge($condition, $pinned);
 215                         }
 216                 }
 217
 218                 return self::selectThreadForUser($uid, $selected, $condition, $params);
 219         }
 220
 221         /**
 222          * Fetch a single item row
 223          *
 224          * @param mixed $stmt statement object
 225          * @return array current row
 226          */
 227         public static function fetch($stmt)
 228         {
 229                 $row = DBA::fetch($stmt);
 230
 231                 if (is_bool($row)) {
 232                         return $row;
 233                 }
 234
 235                 // ---------------------- Transform item structure data ----------------------
 236
 237                 // We prefer the data from the user's contact over the public one
 238                 if (!empty($row['author-link']) && !empty($row['contact-link']) &&
 239                         ($row['author-link'] == $row['contact-link'])) {
 240                         if (isset($row['author-avatar']) && !empty($row['contact-avatar'])) {
 241                                 $row['author-avatar'] = $row['contact-avatar'];
 242                         }
 243                         if (isset($row['author-name']) && !empty($row['contact-name'])) {
 244                                 $row['author-name'] = $row['contact-name'];
 245                         }
 246                 }
 247
 248                 if (!empty($row['owner-link']) && !empty($row['contact-link']) &&
 249                         ($row['owner-link'] == $row['contact-link'])) {
 250                         if (isset($row['owner-avatar']) && !empty($row['contact-avatar'])) {
 251                                 $row['owner-avatar'] = $row['contact-avatar'];
 252                         }
 253                         if (isset($row['owner-name']) && !empty($row['contact-name'])) {
 254                                 $row['owner-name'] = $row['contact-name'];
 255                         }
 256                 }
 257
 258                 // We can always comment on posts from these networks
 259                 if (array_key_exists('writable', $row) &&
 260                         in_array($row['internal-network'], Protocol::FEDERATED)) {
 261                         $row['writable'] = true;
 262                 }
 263
 264                 // ---------------------- Transform item content data ----------------------
 265
 266                 // Fetch data from the item-content table whenever there is content there
 267                 if (self::isLegacyMode()) {
 268                         $legacy_fields = array_merge(Post\DeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
 269                         foreach ($legacy_fields as $field) {
 270                                 if (empty($row[$field]) && !empty($row['internal-item-' . $field])) {
 271                                         $row[$field] = $row['internal-item-' . $field];
 272                                 }
 273                                 unset($row['internal-item-' . $field]);
 274                         }
 275                 }
 276
 277                 if (array_key_exists('verb', $row)) {
 278                         if (!is_null($row['internal-verb'])) {
 279                                 $row['verb'] = $row['internal-verb'];
 280                         }
 281
 282                         if (in_array($row['verb'], self::ACTIVITIES)) {
 283                                 if (array_key_exists('title', $row)) {
 284                                         $row['title'] = '';
 285                                 }
 286                                 if (array_key_exists('body', $row)) {
 287                                         $row['body'] = $row['verb'];
 288                                 }
 289                                 if (array_key_exists('object', $row)) {
 290                                         $row['object'] = '';
 291                                 }
 292                                 if (array_key_exists('object-type', $row)) {
 293                                         $row['object-type'] = Activity\ObjectType::NOTE;
 294                                 }
 295                         } elseif (in_array($row['verb'], ['', Activity::POST, Activity::SHARE])) {
 296                                 // Posts don't have a target - but having tags or files.
 297                                 if (array_key_exists('target', $row)) {
 298                                         $row['target'] = '';
 299                                 }
 300                         }
 301                 }
 302
 303                 if (array_key_exists('vid', $row) && is_null($row['vid']) && !empty($row['verb'])) {
 304                         $row['vid'] = Verb::getID($row['verb']);
 305                 }
 306
 307                 if (!array_key_exists('verb', $row) || in_array($row['verb'], ['', Activity::POST, Activity::SHARE])) {
 308                         // Build the file string out of the term entries
 309                         if (array_key_exists('file', $row) && empty($row['file'])) {
 310                                 $row['file'] = Category::getTextByURIId($row['internal-uri-id'], $row['internal-uid']);
 311                         }
 312                 }
 313
 314                 if ($row['internal-psid'] == RepPermissionSet::PUBLIC) {
 315                         if (array_key_exists('allow_cid', $row)) {
 316                                 $row['allow_cid'] = '';
 317                         }
 318                         if (array_key_exists('allow_gid', $row)) {
 319                                 $row['allow_gid'] = '';
 320                         }
 321                         if (array_key_exists('deny_cid', $row)) {
 322                                 $row['deny_cid'] = '';
 323                         }
 324                         if (array_key_exists('deny_gid', $row)) {
 325                                 $row['deny_gid'] = '';
 326                         }
 327                 }
 328
 329                 if (array_key_exists('ignored', $row) && array_key_exists('internal-user-ignored', $row) && !is_null($row['internal-user-ignored'])) {
 330                         $row['ignored'] = $row['internal-user-ignored'];
 331                 }
 332
 333                 // Remove internal fields
 334                 unset($row['internal-network']);
 335                 unset($row['internal-uri-id']);
 336                 unset($row['internal-uid']);
 337                 unset($row['internal-psid']);
 338                 unset($row['internal-verb']);
 339                 unset($row['internal-user-ignored']);
 340                 unset($row['interaction']);
 341
 342                 return $row;
 343         }
 344
 345         /**
 346          * Fills an array with data from an item query
 347          *
 348          * @param object $stmt statement object
 349          * @param bool   $do_close
 350          * @return array Data array
 351          */
 352         public static function inArray($stmt, $do_close = true) {
 353                 if (is_bool($stmt)) {
 354                         return $stmt;
 355                 }
 356
 357                 $data = [];
 358                 while ($row = self::fetch($stmt)) {
 359                         $data[] = $row;
 360                 }
 361                 if ($do_close) {
 362                         DBA::close($stmt);
 363                 }
 364                 return $data;
 365         }
 366
 367         /**
 368          * Check if item data exists
 369          *
 370          * @param array $condition array of fields for condition
 371          *
 372          * @return boolean Are there rows for that condition?
 373          * @throws \Exception
 374          */
 375         public static function exists($condition) {
 376                 $stmt = self::select(['id'], $condition, ['limit' => 1]);
 377
 378                 if (is_bool($stmt)) {
 379                         $retval = $stmt;
 380                 } else {
 381                         $retval = (DBA::numRows($stmt) > 0);
 382                 }
 383
 384                 DBA::close($stmt);
 385
 386                 return $retval;
 387         }
 388
 389         /**
 390          * Retrieve a single record from the item table for a given user and returns it in an associative array
 391          *
 392          * @param integer $uid User ID
 393          * @param array   $selected
 394          * @param array   $condition
 395          * @param array   $params
 396          * @return bool|array
 397          * @throws \Exception
 398          * @see   DBA::select
 399          */
 400         public static function selectFirstForUser($uid, array $selected = [], array $condition = [], $params = [])
 401         {
 402                 $params['uid'] = $uid;
 403
 404                 if (empty($selected)) {
 405                         $selected = Item::DISPLAY_FIELDLIST;
 406                 }
 407
 408                 return self::selectFirst($selected, $condition, $params);
 409         }
 410
 411         /**
 412          * Select rows from the item table for a given user
 413          *
 414          * @param integer $uid       User ID
 415          * @param array   $selected  Array of selected fields, empty for all
 416          * @param array   $condition Array of fields for condition
 417          * @param array   $params    Array of several parameters
 418          *
 419          * @return boolean|object
 420          * @throws \Exception
 421          */
 422         public static function selectForUser($uid, array $selected = [], array $condition = [], $params = [])
 423         {
 424                 $params['uid'] = $uid;
 425
 426                 if (empty($selected)) {
 427                         $selected = Item::DISPLAY_FIELDLIST;
 428                 }
 429
 430                 return self::select($selected, $condition, $params);
 431         }
 432
 433         /**
 434          * Retrieve a single record from the item table and returns it in an associative array
 435          *
 436          * @param array $fields
 437          * @param array $condition
 438          * @param array $params
 439          * @return bool|array
 440          * @throws \Exception
 441          * @see   DBA::select
 442          */
 443         public static function selectFirst(array $fields = [], array $condition = [], $params = [])
 444         {
 445                 $params['limit'] = 1;
 446
 447                 $result = self::select($fields, $condition, $params);
 448
 449                 if (is_bool($result)) {
 450                         return $result;
 451                 } else {
 452                         $row = self::fetch($result);
 453                         DBA::close($result);
 454                         return $row;
 455                 }
 456         }
 457
 458         /**
 459          * Select rows from the item table and returns them as an array
 460          *
 461          * @param array $selected  Array of selected fields, empty for all
 462          * @param array $condition Array of fields for condition
 463          * @param array $params    Array of several parameters
 464          *
 465          * @return array
 466          * @throws \Exception
 467          */
 468         public static function selectToArray(array $fields = [], array $condition = [], $params = [])
 469         {
 470                 $result = self::select($fields, $condition, $params);
 471
 472                 if (is_bool($result)) {
 473                         return [];
 474                 }
 475
 476                 $data = [];
 477                 while ($row = self::fetch($result)) {
 478                         $data[] = $row;
 479                 }
 480                 DBA::close($result);
 481
 482                 return $data;
 483         }
 484
 485         /**
 486          * Select rows from the item table
 487          *
 488          * @param array $selected  Array of selected fields, empty for all
 489          * @param array $condition Array of fields for condition
 490          * @param array $params    Array of several parameters
 491          *
 492          * @return boolean|object
 493          * @throws \Exception
 494          */
 495         public static function select(array $selected = [], array $condition = [], $params = [])
 496         {
 497                 $uid = 0;
 498                 $usermode = false;
 499
 500                 if (isset($params['uid'])) {
 501                         $uid = $params['uid'];
 502                         $usermode = true;
 503                 }
 504
 505                 $fields = self::fieldlist($usermode);
 506
 507                 $select_fields = self::constructSelectFields($fields, $selected);
 508
 509                 $condition_string = DBA::buildCondition($condition);
 510
 511                 $condition_string = self::addTablesToFields($condition_string, $fields);
 512
 513                 if ($usermode) {
 514                         $condition_string = $condition_string . ' AND ' . self::condition(false);
 515                 }
 516
 517                 $param_string = self::addTablesToFields(DBA::buildParameter($params), $fields);
 518
 519                 $table = "`item` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, false, $usermode);
 520
 521                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 522
 523                 return DBA::p($sql, $condition);
 524         }
 525
 526         /**
 527          * Select rows from the starting post in the item table
 528          *
 529          * @param integer $uid       User ID
 530          * @param array   $selected
 531          * @param array   $condition Array of fields for condition
 532          * @param array   $params    Array of several parameters
 533          *
 534          * @return boolean|object
 535          * @throws \Exception
 536          */
 537         public static function selectThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 538         {
 539                 $params['uid'] = $uid;
 540
 541                 if (empty($selected)) {
 542                         $selected = Item::DISPLAY_FIELDLIST;
 543                 }
 544
 545                 return self::selectThread($selected, $condition, $params);
 546         }
 547
 548         /**
 549          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 550          *
 551          * @param integer $uid User ID
 552          * @param array   $selected
 553          * @param array   $condition
 554          * @param array   $params
 555          * @return bool|array
 556          * @throws \Exception
 557          * @see   DBA::select
 558          */
 559         public static function selectFirstThreadForUser($uid, array $selected = [], array $condition = [], $params = [])
 560         {
 561                 $params['uid'] = $uid;
 562
 563                 if (empty($selected)) {
 564                         $selected = Item::DISPLAY_FIELDLIST;
 565                 }
 566
 567                 return self::selectFirstThread($selected, $condition, $params);
 568         }
 569
 570         /**
 571          * Retrieve a single record from the starting post in the item table and returns it in an associative array
 572          *
 573          * @param array $fields
 574          * @param array $condition
 575          * @param array $params
 576          * @return bool|array
 577          * @throws \Exception
 578          * @see   DBA::select
 579          */
 580         public static function selectFirstThread(array $fields = [], array $condition = [], $params = [])
 581         {
 582                 $params['limit'] = 1;
 583                 $result = self::selectThread($fields, $condition, $params);
 584
 585                 if (is_bool($result)) {
 586                         return $result;
 587                 } else {
 588                         $row = self::fetch($result);
 589                         DBA::close($result);
 590                         return $row;
 591                 }
 592         }
 593
 594         /**
 595          * Select rows from the starting post in the item table
 596          *
 597          * @param array $selected  Array of selected fields, empty for all
 598          * @param array $condition Array of fields for condition
 599          * @param array $params    Array of several parameters
 600          *
 601          * @return boolean|object
 602          * @throws \Exception
 603          */
 604         public static function selectThread(array $selected = [], array $condition = [], $params = [])
 605         {
 606                 $uid = 0;
 607                 $usermode = false;
 608
 609                 if (isset($params['uid'])) {
 610                         $uid = $params['uid'];
 611                         $usermode = true;
 612                 }
 613
 614                 $fields = self::fieldlist($usermode);
 615
 616                 $fields['thread'] = ['mention', 'ignored', 'iid'];
 617
 618                 $threadfields = ['thread' => ['iid', 'uid', 'contact-id', 'owner-id', 'author-id',
 619                         'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private',
 620                         'pubmail', 'moderated', 'visible', 'starred', 'ignored', 'post-type',
 621                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'network']];
 622
 623                 $select_fields = self::constructSelectFields($fields, $selected);
 624
 625                 $condition_string = DBA::buildCondition($condition);
 626
 627                 $condition_string = self::addTablesToFields($condition_string, $threadfields);
 628                 $condition_string = self::addTablesToFields($condition_string, $fields);
 629
 630                 if ($usermode) {
 631                         $condition_string = $condition_string . ' AND ' . self::condition(true);
 632                 }
 633
 634                 $param_string = DBA::buildParameter($params);
 635                 $param_string = self::addTablesToFields($param_string, $threadfields);
 636                 $param_string = self::addTablesToFields($param_string, $fields);
 637
 638                 $table = "`thread` " . self::constructJoins($uid, $select_fields . $condition_string . $param_string, true, $usermode);
 639
 640                 $sql = "SELECT " . $select_fields . " FROM " . $table . $condition_string . $param_string;
 641
 642                 return DBA::p($sql, $condition);
 643         }
 644
 645         /**
 646          * Returns a list of fields that are associated with the item table
 647          *
 648          * @param $usermode
 649          * @return array field list
 650          */
 651         private static function fieldlist($usermode)
 652         {
 653                 $fields = [];
 654
 655                 $fields['item'] = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 656                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 657                         'contact-id', 'owner-id', 'author-id', 'type', 'wall', 'gravity', 'extid',
 658                         'created', 'edited', 'commented', 'received', 'changed', 'psid',
 659                         'resource-id', 'event-id', 'attach', 'post-type', 'file',
 660                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 661                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global',
 662                         'id' => 'item_id', 'network', 'icid',
 663                         'uri-id' => 'internal-uri-id', 'uid' => 'internal-uid',
 664                         'network' => 'internal-network', 'psid' => 'internal-psid'];
 665
 666                 if ($usermode) {
 667                         $fields['user-item'] = ['pinned', 'notification-type', 'ignored' => 'internal-user-ignored'];
 668                 }
 669
 670                 $fields['item-content'] = array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST);
 671
 672                 $fields['post-delivery-data'] = array_merge(Post\DeliveryData::LEGACY_FIELD_LIST, Post\DeliveryData::FIELD_LIST);
 673
 674                 $fields['verb'] = ['name' => 'internal-verb'];
 675
 676                 $fields['permissionset'] = ['allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
 677
 678                 $fields['author'] = ['url' => 'author-link', 'name' => 'author-name', 'addr' => 'author-addr',
 679                         'thumb' => 'author-avatar', 'nick' => 'author-nick', 'network' => 'author-network'];
 680
 681                 $fields['owner'] = ['url' => 'owner-link', 'name' => 'owner-name', 'addr' => 'owner-addr',
 682                         'thumb' => 'owner-avatar', 'nick' => 'owner-nick', 'network' => 'owner-network'];
 683
 684                 $fields['contact'] = ['url' => 'contact-link', 'name' => 'contact-name', 'thumb' => 'contact-avatar',
 685                         'writable', 'self', 'id' => 'cid', 'alias', 'uid' => 'contact-uid',
 686                         'photo', 'name-date', 'uri-date', 'avatar-date', 'thumb', 'dfrn-id'];
 687
 688                 $fields['parent-item'] = ['guid' => 'parent-guid', 'network' => 'parent-network'];
 689
 690                 $fields['parent-item-author'] = ['url' => 'parent-author-link', 'name' => 'parent-author-name',
 691                         'network' => 'parent-author-network'];
 692
 693                 $fields['event'] = ['created' => 'event-created', 'edited' => 'event-edited',
 694                         'start' => 'event-start','finish' => 'event-finish',
 695                         'summary' => 'event-summary','desc' => 'event-desc',
 696                         'location' => 'event-location', 'type' => 'event-type',
 697                         'nofinish' => 'event-nofinish','adjust' => 'event-adjust',
 698                         'ignore' => 'event-ignore', 'id' => 'event-id'];
 699
 700                 $fields['diaspora-interaction'] = ['interaction', 'interaction' => 'signed_text'];
 701
 702                 return $fields;
 703         }
 704
 705         /**
 706          * Returns SQL condition for the "select" functions
 707          *
 708          * @param boolean $thread_mode Called for the items (false) or for the threads (true)
 709          *
 710          * @return string SQL condition
 711          */
 712         private static function condition($thread_mode)
 713         {
 714                 if ($thread_mode) {
 715                         $master_table = "`thread`";
 716                 } else {
 717                         $master_table = "`item`";
 718                 }
 719                 return sprintf("$master_table.`visible` AND NOT $master_table.`deleted` AND NOT $master_table.`moderated`
 720                         AND (`user-item`.`hidden` IS NULL OR NOT `user-item`.`hidden`)
 721                         AND (`user-author`.`blocked` IS NULL OR NOT `user-author`.`blocked`)
 722                         AND (`user-author`.`ignored` IS NULL OR NOT `user-author`.`ignored` OR `item`.`gravity` != %d)
 723                         AND (`user-owner`.`blocked` IS NULL OR NOT `user-owner`.`blocked`)
 724                         AND (`user-owner`.`ignored` IS NULL OR NOT `user-owner`.`ignored` OR `item`.`gravity` != %d) ",
 725                         GRAVITY_PARENT, GRAVITY_PARENT);
 726         }
 727
 728         /**
 729          * Returns all needed "JOIN" commands for the "select" functions
 730          *
 731          * @param integer $uid          User ID
 732          * @param string  $sql_commands The parts of the built SQL commands in the "select" functions
 733          * @param boolean $thread_mode  Called for the items (false) or for the threads (true)
 734          *
 735          * @param         $user_mode
 736          * @return string The SQL joins for the "select" functions
 737          */
 738         private static function constructJoins($uid, $sql_commands, $thread_mode, $user_mode)
 739         {
 740                 if ($thread_mode) {
 741                         $master_table = "`thread`";
 742                         $master_table_key = "`thread`.`iid`";
 743                         $joins = "STRAIGHT_JOIN `item` ON `item`.`id` = `thread`.`iid` ";
 744                 } else {
 745                         $master_table = "`item`";
 746                         $master_table_key = "`item`.`id`";
 747                         $joins = '';
 748                 }
 749
 750                 if ($user_mode) {
 751                         $joins .= sprintf("STRAIGHT_JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`
 752                                 AND NOT `contact`.`blocked`
 753                                 AND ((NOT `contact`.`readonly` AND NOT `contact`.`pending` AND (`contact`.`rel` IN (%s, %s)))
 754                                 OR `contact`.`self` OR `item`.`gravity` != %d OR `contact`.`uid` = 0)
 755                                 STRAIGHT_JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id` AND NOT `author`.`blocked`
 756                                 STRAIGHT_JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id` AND NOT `owner`.`blocked`
 757                                 LEFT JOIN `user-item` ON `user-item`.`iid` = $master_table_key AND `user-item`.`uid` = %d
 758                                 LEFT JOIN `user-contact` AS `user-author` ON `user-author`.`cid` = $master_table.`author-id` AND `user-author`.`uid` = %d
 759                                 LEFT JOIN `user-contact` AS `user-owner` ON `user-owner`.`cid` = $master_table.`owner-id` AND `user-owner`.`uid` = %d",
 760                                 Contact::SHARING, Contact::FRIEND, GRAVITY_PARENT, intval($uid), intval($uid), intval($uid));
 761                 } else {
 762                         if (strpos($sql_commands, "`contact`.") !== false) {
 763                                 $joins .= "LEFT JOIN `contact` ON `contact`.`id` = $master_table.`contact-id`";
 764                         }
 765                         if (strpos($sql_commands, "`author`.") !== false) {
 766                                 $joins .= " LEFT JOIN `contact` AS `author` ON `author`.`id` = $master_table.`author-id`";
 767                         }
 768                         if (strpos($sql_commands, "`owner`.") !== false) {
 769                                 $joins .= " LEFT JOIN `contact` AS `owner` ON `owner`.`id` = $master_table.`owner-id`";
 770                         }
 771                 }
 772
 773                 if (strpos($sql_commands, "`group_member`.") !== false) {
 774                         $joins .= " STRAIGHT_JOIN `group_member` ON `group_member`.`contact-id` = $master_table.`contact-id`";
 775                 }
 776
 777                 if (strpos($sql_commands, "`user`.") !== false) {
 778                         $joins .= " STRAIGHT_JOIN `user` ON `user`.`uid` = $master_table.`uid`";
 779                 }
 780
 781                 if (strpos($sql_commands, "`event`.") !== false) {
 782                         $joins .= " LEFT JOIN `event` ON `event-id` = `event`.`id`";
 783                 }
 784
 785                 if (strpos($sql_commands, "`diaspora-interaction`.") !== false) {
 786                         $joins .= " LEFT JOIN `diaspora-interaction` ON `diaspora-interaction`.`uri-id` = `item`.`uri-id`";
 787                 }
 788
 789                 if (strpos($sql_commands, "`item-content`.") !== false) {
 790                         $joins .= " LEFT JOIN `item-content` ON `item-content`.`uri-id` = `item`.`uri-id`";
 791                 }
 792
 793                 if (strpos($sql_commands, "`post-delivery-data`.") !== false) {
 794                         $joins .= " LEFT JOIN `post-delivery-data` ON `post-delivery-data`.`uri-id` = `item`.`uri-id` AND `item`.`origin`";
 795                 }
 796
 797                 if (strpos($sql_commands, "`verb`.") !== false) {
 798                         $joins .= " LEFT JOIN `verb` ON `verb`.`id` = `item`.`vid`";
 799                 }
 800
 801                 if (strpos($sql_commands, "`permissionset`.") !== false) {
 802                         $joins .= " LEFT JOIN `permissionset` ON `permissionset`.`id` = `item`.`psid`";
 803                 }
 804
 805                 if ((strpos($sql_commands, "`parent-item`.") !== false) || (strpos($sql_commands, "`parent-item-author`.") !== false)) {
 806                         $joins .= " STRAIGHT_JOIN `item` AS `parent-item` ON `parent-item`.`id` = `item`.`parent`";
 807
 808                         if (strpos($sql_commands, "`parent-item-author`.") !== false) {
 809                                 $joins .= " STRAIGHT_JOIN `contact` AS `parent-item-author` ON `parent-item-author`.`id` = `parent-item`.`author-id`";
 810                         }
 811                 }
 812
 813                 return $joins;
 814         }
 815
 816         /**
 817          * Add the field list for the "select" functions
 818          *
 819          * @param array $fields The field definition array
 820          * @param array $selected The array with the selected fields from the "select" functions
 821          *
 822          * @return string The field list
 823          */
 824         private static function constructSelectFields(array $fields, array $selected)
 825         {
 826                 if (!empty($selected)) {
 827                         $selected = array_merge($selected, ['internal-uri-id', 'internal-uid', 'internal-psid', 'internal-network']);
 828                 }
 829
 830                 if (in_array('verb', $selected)) {
 831                         $selected = array_merge($selected, ['internal-verb']);
 832                 }
 833
 834                 if (in_array('ignored', $selected)) {
 835                         $selected[] = 'internal-user-ignored';
 836                 }
 837
 838                 $legacy_fields = array_merge(Post\DeliveryData::LEGACY_FIELD_LIST, self::MIXED_CONTENT_FIELDLIST);
 839
 840                 $selection = [];
 841                 foreach ($fields as $table => $table_fields) {
 842                         foreach ($table_fields as $field => $select) {
 843                                 if (empty($selected) || in_array($select, $selected)) {
 844                                         if (self::isLegacyMode() && in_array($select, $legacy_fields)) {
 845                                                 $selection[] = "`item`.`".$select."` AS `internal-item-" . $select . "`";
 846                                         }
 847                                         if (is_int($field)) {
 848                                                 $selection[] = "`" . $table . "`.`" . $select . "`";
 849                                         } else {
 850                                                 $selection[] = "`" . $table . "`.`" . $field . "` AS `" . $select . "`";
 851                                         }
 852                                 }
 853                         }
 854                 }
 855                 return implode(", ", $selection);
 856         }
 857
 858         /**
 859          * add table definition to fields in an SQL query
 860          *
 861          * @param string $query SQL query
 862          * @param array $fields The field definition array
 863          *
 864          * @return string the changed SQL query
 865          */
 866         private static function addTablesToFields($query, $fields)
 867         {
 868                 foreach ($fields as $table => $table_fields) {
 869                         foreach ($table_fields as $alias => $field) {
 870                                 if (is_int($alias)) {
 871                                         $replace_field = $field;
 872                                 } else {
 873                                         $replace_field = $alias;
 874                                 }
 875
 876                                 $search = "/([^\.])`" . $field . "`/i";
 877                                 $replace = "$1`" . $table . "`.`" . $replace_field . "`";
 878                                 $query = preg_replace($search, $replace, $query);
 879                         }
 880                 }
 881                 return $query;
 882         }
 883
 884         /**
 885          * Update existing item entries
 886          *
 887          * @param array $fields    The fields that are to be changed
 888          * @param array $condition The condition for finding the item entries
 889          *
 890          * In the future we may have to change permissions as well.
 891          * Then we had to add the user id as third parameter.
 892          *
 893          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 894          *
 895          * @return integer|boolean number of affected rows - or "false" if there was an error
 896          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 897          */
 898         public static function update(array $fields, array $condition)
 899         {
 900                 if (empty($condition) || empty($fields)) {
 901                         return false;
 902                 }
 903
 904                 // To ensure the data integrity we do it in an transaction
 905                 DBA::transaction();
 906
 907                 // We cannot simply expand the condition to check for origin entries
 908                 // The condition needn't to be a simple array but could be a complex condition.
 909                 // And we have to execute this query before the update to ensure to fetch the same data.
 910                 $items = DBA::select('item', ['id', 'origin', 'uri', 'uri-id', 'icid', 'uid', 'file'], $condition);
 911
 912                 $content_fields = [];
 913                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
 914                         if (isset($fields[$field])) {
 915                                 $content_fields[$field] = $fields[$field];
 916                                 if (in_array($field, self::CONTENT_FIELDLIST) || !self::isLegacyMode()) {
 917                                         unset($fields[$field]);
 918                                 } else {
 919                                         $fields[$field] = null;
 920                                 }
 921                         }
 922                 }
 923
 924                 $delivery_data = Post\DeliveryData::extractFields($fields);
 925
 926                 $clear_fields = ['bookmark', 'type', 'author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link', 'postopts', 'inform'];
 927                 foreach ($clear_fields as $field) {
 928                         if (array_key_exists($field, $fields)) {
 929                                 $fields[$field] = null;
 930                         }
 931                 }
 932
 933                 if (array_key_exists('file', $fields)) {
 934                         $files = $fields['file'];
 935                         $fields['file'] = null;
 936                 } else {
 937                         $files = null;
 938                 }
 939
 940                 if (!empty($content_fields['verb'])) {
 941                         $fields['vid'] = Verb::getID($content_fields['verb']);
 942                 }
 943
 944                 if (!empty($fields)) {
 945                         $success = DBA::update('item', $fields, $condition);
 946
 947                         if (!$success) {
 948                                 DBA::close($items);
 949                                 DBA::rollback();
 950                                 return false;
 951                         }
 952                 }
 953
 954                 // When there is no content for the "old" item table, this will count the fetched items
 955                 $rows = DBA::affectedRows();
 956
 957                 $notify_items = [];
 958
 959                 while ($item = DBA::fetch($items)) {
 960                         if (empty($content_fields['verb']) || !in_array($content_fields['verb'], self::ACTIVITIES)) {
 961                                 self::updateContent($content_fields, ['uri-id' => $item['uri-id']]);
 962
 963                                 if (empty($item['icid'])) {
 964                                         $item_content = DBA::selectFirst('item-content', [], ['uri-id' => $item['uri-id']]);
 965                                         if (DBA::isResult($item_content)) {
 966                                                 $item_fields = ['icid' => $item_content['id']];
 967                                                 // Clear all fields in the item table that have a content in the item-content table
 968                                                 if (self::isLegacyMode()) {
 969                                                         foreach ($item_content as $field => $content) {
 970                                                                 if (in_array($field, self::MIXED_CONTENT_FIELDLIST) && !empty($content)) {
 971                                                                         $item_fields[$field] = null;
 972                                                                 }
 973                                                         }
 974                                                 }
 975                                                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 976                                         }
 977                                 }
 978                         }
 979
 980                         if (!is_null($files)) {
 981                                 Category::storeTextByURIId($item['uri-id'], $item['uid'], $files);
 982                                 if (!empty($item['file'])) {
 983                                         DBA::update('item', ['file' => ''], ['id' => $item['id']]);
 984                                 }
 985                         }
 986
 987                         Post\DeliveryData::update($item['uri-id'], $delivery_data);
 988
 989                         self::updateThread($item['id']);
 990
 991                         // We only need to notfiy others when it is an original entry from us.
 992                         // Only call the notifier when the item has some content relevant change.
 993                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 994                                 $notify_items[] = $item['id'];
 995                         }
 996                 }
 997
 998                 DBA::close($items);
 999                 DBA::commit();
1000
1001                 foreach ($notify_items as $notify_item) {
1002                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $notify_item);
1003                 }
1004
1005                 return $rows;
1006         }
1007
1008         /**
1009          * Delete an item and notify others about it - if it was ours
1010          *
1011          * @param array   $condition The condition for finding the item entries
1012          * @param integer $priority  Priority for the notification
1013          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1014          */
1015         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
1016         {
1017                 $items = self::select(['id'], $condition);
1018                 while ($item = self::fetch($items)) {
1019                         self::markForDeletionById($item['id'], $priority);
1020                 }
1021                 DBA::close($items);
1022         }
1023
1024         /**
1025          * Delete an item for an user and notify others about it - if it was ours
1026          *
1027          * @param array   $condition The condition for finding the item entries
1028          * @param integer $uid       User who wants to delete this item
1029          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1030          */
1031         public static function deleteForUser($condition, $uid)
1032         {
1033                 if ($uid == 0) {
1034                         return;
1035                 }
1036
1037                 $items = self::select(['id', 'uid'], $condition);
1038                 while ($item = self::fetch($items)) {
1039                         // "Deleting" global items just means hiding them
1040                         if ($item['uid'] == 0) {
1041                                 DBA::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
1042
1043                                 // Delete notifications
1044                                 DBA::delete('notify', ['iid' => $item['id'], 'uid' => $uid]);
1045                         } elseif ($item['uid'] == $uid) {
1046                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
1047                         } else {
1048                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
1049                         }
1050                 }
1051                 DBA::close($items);
1052         }
1053
1054         /**
1055          * Mark an item for deletion, delete related data and notify others about it - if it was ours
1056          *
1057          * @param integer $item_id
1058          * @param integer $priority Priority for the notification
1059          *
1060          * @return boolean success
1061          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1062          */
1063         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
1064         {
1065                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
1066                 // locate item to be deleted
1067                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri', 'origin',
1068                         'deleted', 'file', 'resource-id', 'event-id', 'attach',
1069                         'verb', 'object-type', 'object', 'target', 'contact-id',
1070                         'icid', 'psid', 'gravity'];
1071                 $item = self::selectFirst($fields, ['id' => $item_id]);
1072                 if (!DBA::isResult($item)) {
1073                         Logger::info('Item not found.', ['id' => $item_id]);
1074                         return false;
1075                 }
1076
1077                 if ($item['deleted']) {
1078                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
1079                         return false;
1080                 }
1081
1082                 $parent = self::selectFirst(['origin'], ['id' => $item['parent']]);
1083                 if (!DBA::isResult($parent)) {
1084                         $parent = ['origin' => false];
1085                 }
1086
1087                 // clean up categories and tags so they don't end up as orphans
1088
1089                 $matches = [];
1090                 $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
1091
1092                 if ($cnt) {
1093                         foreach ($matches as $mtch) {
1094                                 FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],true);
1095                         }
1096                 }
1097
1098                 $matches = [];
1099
1100                 $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
1101
1102                 if ($cnt) {
1103                         foreach ($matches as $mtch) {
1104                                 FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],false);
1105                         }
1106                 }
1107
1108                 /*
1109                  * If item is a link to a photo resource, nuke all the associated photos
1110                  * (visitors will not have photo resources)
1111                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
1112                  * generate a resource-id and therefore aren't intimately linked to the item.
1113                  */
1114                 /// @TODO: this should first check if photo is used elsewhere
1115                 if (strlen($item['resource-id'])) {
1116                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
1117                 }
1118
1119                 // If item is a link to an event, delete the event.
1120                 if (intval($item['event-id'])) {
1121                         Event::delete($item['event-id']);
1122                 }
1123
1124                 // If item has attachments, drop them
1125                 /// @TODO: this should first check if attachment is used elsewhere
1126                 foreach (explode(",", $item['attach']) as $attach) {
1127                         preg_match("|attach/(\d+)|", $attach, $matches);
1128                         if (is_array($matches) && count($matches) > 1) {
1129                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
1130                         }
1131                 }
1132
1133                 // Delete notifications
1134                 DBA::delete('notify', ['iid' => $item['id'], 'uid' => $item['uid']]);
1135
1136                 // Set the item to "deleted"
1137                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
1138                 DBA::update('item', $item_fields, ['id' => $item['id']]);
1139
1140                 Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
1141                 self::deleteThread($item['id'], $item['parent-uri']);
1142
1143                 if (!self::exists(["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
1144                         self::markForDeletion(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
1145                 }
1146
1147                 Post\DeliveryData::delete($item['uri-id']);
1148
1149                 if (!empty($item['icid']) && !self::exists(['icid' => $item['icid'], 'deleted' => false])) {
1150                         DBA::delete('item-content', ['id' => $item['icid']], ['cascade' => false]);
1151                 }
1152                 // When the permission set will be used in photo and events as well,
1153                 // this query here needs to be extended.
1154                 // @todo Currently deactivated. We need the permission set in the deletion process.
1155                 // This is a reminder to add the removal somewhere else.
1156                 //if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
1157                 //      DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
1158                 //}
1159
1160                 // If it's the parent of a comment thread, kill all the kids
1161                 if ($item['gravity'] == GRAVITY_PARENT) {
1162                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
1163                 }
1164
1165                 // Is it our comment and/or our thread?
1166                 if ($item['origin'] || $parent['origin']) {
1167                         // When we delete the original post we will delete all existing copies on the server as well
1168                         self::markForDeletion(['uri' => $item['uri'], 'deleted' => false], $priority);
1169
1170                         // send the notification upstream/downstream
1171                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, intval($item['id']));
1172                 } elseif ($item['uid'] != 0) {
1173
1174                         // When we delete just our local user copy of an item, we have to set a marker to hide it
1175                         $global_item = self::selectFirst(['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
1176                         if (DBA::isResult($global_item)) {
1177                                 DBA::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
1178                         }
1179                 }
1180
1181                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
1182
1183                 return true;
1184         }
1185
1186
1187         private static function guid($item, $notify)
1188         {
1189                 if (!empty($item['guid'])) {
1190                         return Strings::escapeTags(trim($item['guid']));
1191                 }
1192
1193                 if ($notify) {
1194                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
1195                         // We add the hash of our own host because our host is the original creator of the post.
1196                         $prefix_host = DI::baseUrl()->getHostname();
1197                 } else {
1198                         $prefix_host = '';
1199
1200                         // We are only storing the post so we create a GUID from the original hostname.
1201                         if (!empty($item['author-link'])) {
1202                                 $parsed = parse_url($item['author-link']);
1203                                 if (!empty($parsed['host'])) {
1204                                         $prefix_host = $parsed['host'];
1205                                 }
1206                         }
1207
1208                         if (empty($prefix_host) && !empty($item['plink'])) {
1209                                 $parsed = parse_url($item['plink']);
1210                                 if (!empty($parsed['host'])) {
1211                                         $prefix_host = $parsed['host'];
1212                                 }
1213                         }
1214
1215                         if (empty($prefix_host) && !empty($item['uri'])) {
1216                                 $parsed = parse_url($item['uri']);
1217                                 if (!empty($parsed['host'])) {
1218                                         $prefix_host = $parsed['host'];
1219                                 }
1220                         }
1221
1222                         // Is it in the format data@host.tld? - Used for mail contacts
1223                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
1224                                 $mailparts = explode('@', $item['author-link']);
1225                                 $prefix_host = array_pop($mailparts);
1226                         }
1227                 }
1228
1229                 if (!empty($item['plink'])) {
1230                         $guid = self::guidFromUri($item['plink'], $prefix_host);
1231                 } elseif (!empty($item['uri'])) {
1232                         $guid = self::guidFromUri($item['uri'], $prefix_host);
1233                 } else {
1234                         $guid = System::createUUID(hash('crc32', $prefix_host));
1235                 }
1236
1237                 return $guid;
1238         }
1239
1240         private static function contactId($item)
1241         {
1242                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
1243                         return $item['contact-id'];
1244                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
1245                         return $item['contact-id'];
1246                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
1247                         return $item['author-id'];
1248                 } elseif (!empty($item['contact-id'])) {
1249                         return $item['contact-id'];
1250                 } else {
1251                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
1252                         if (!empty($contact_id)) {
1253                                 return $contact_id;
1254                         }
1255                 }
1256                 return $item['author-id'];
1257         }
1258
1259         // This function will finally cover most of the preparation functionality in mod/item.php
1260         public static function prepare(&$item)
1261         {
1262                 /*
1263                  * @TODO: Unused code triggering inspection errors
1264                  *
1265                 $data = BBCode::getAttachmentData($item['body']);
1266                 if ((preg_match_all("/\[bookmark\=([^\]]*)\](.*?)\[\/bookmark\]/ism", $item['body'], $match, PREG_SET_ORDER) || isset($data["type"]))
1267                         && ($posttype != Item::PT_PERSONAL_NOTE)) {
1268                         $posttype = Item::PT_PAGE;
1269                         $objecttype = ACTIVITY_OBJ_BOOKMARK;
1270                 }
1271                  */
1272         }
1273
1274         /**
1275          * Write an item array into a spool file to be inserted later.
1276          * This command is called whenever there are issues storing an item.
1277          *
1278          * @param array $item The item fields that are to be inserted
1279          * @throws \Exception
1280          */
1281         private static function spool($orig_item)
1282         {
1283                 // Now we store the data in the spool directory
1284                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
1285                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
1286
1287                 $spoolpath = get_spoolpath();
1288                 if ($spoolpath != "") {
1289                         $spool = $spoolpath . '/' . $file;
1290
1291                         file_put_contents($spool, json_encode($orig_item));
1292                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
1293                 }
1294         }
1295
1296         /**
1297          * Check if the item array is a duplicate
1298          *
1299          * @param array $item
1300          * @return boolean is it a duplicate?
1301          */
1302         private static function isDuplicate(array $item)
1303         {
1304                 // Checking if there is already an item with the same guid
1305                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
1306                 if (self::exists($condition)) {
1307                         Logger::notice('Found already existing item', [
1308                                 'guid' => $item['guid'],
1309                                 'uid' => $item['uid'],
1310                                 'network' => $item['network']
1311                         ]);
1312                         return true;
1313                 }
1314
1315                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
1316                         $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
1317                 if (self::exists($condition)) {
1318                         Logger::notice('duplicated item with the same uri found.', $item);
1319                         return true;
1320                 }
1321
1322                 // On Friendica and Diaspora the GUID is unique
1323                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
1324                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
1325                         if (self::exists($condition)) {
1326                                 Logger::notice('duplicated item with the same guid found.', $item);
1327                                 return true;
1328                         }
1329                 } elseif ($item['network'] == Protocol::OSTATUS) {
1330                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
1331                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
1332                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
1333                         if (self::exists($condition)) {
1334                                 Logger::notice('duplicated item with the same body found.', $item);
1335                                 return true;
1336                         }
1337                 }
1338
1339                 /*
1340                  * Check for already added items.
1341                  * There is a timing issue here that sometimes creates double postings.
1342                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
1343                  */
1344                 if (($item['uid'] == 0) && self::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
1345                         Logger::notice('Global item already stored.', ['uri' => $item['uri'], 'network' => $item['network']]);
1346                         return true;
1347                 }
1348
1349                 return false;
1350         }
1351
1352         /**
1353          * Check if the item array is valid
1354          *
1355          * @param array $item
1356          * @return boolean item is valid
1357          */
1358         private static function isValid(array $item)
1359         {
1360                 // When there is no content then we don't post it
1361                 if ($item['body'].$item['title'] == '') {
1362                         Logger::notice('No body, no title.');
1363                         return false;
1364                 }
1365
1366                 // check for create date and expire time
1367                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
1368
1369                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
1370                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
1371                         $expire_interval = $user['expire'];
1372                 }
1373
1374                 if (($expire_interval > 0) && !empty($item['created'])) {
1375                         $expire_date = time() - ($expire_interval * 86400);
1376                         $created_date = strtotime($item['created']);
1377                         if ($created_date < $expire_date) {
1378                                 Logger::notice('Item created before expiration interval.', [
1379                                         'created' => date('c', $created_date),
1380                                         'expired' => date('c', $expire_date),
1381                                         '$item' => $item
1382                                 ]);
1383                                 return false;
1384                         }
1385                 }
1386
1387                 if (Contact::isBlocked($item['author-id'])) {
1388                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
1389                         return false;
1390                 }
1391
1392                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
1393                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
1394                         return false;
1395                 }
1396
1397                 if (!empty($item['uid']) && Contact::isBlockedByUser($item['author-id'], $item['uid'])) {
1398                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $item['uid'], 'item-uri' => $item['uri']]);
1399                         return false;
1400                 }
1401
1402                 if (Contact::isBlocked($item['owner-id'])) {
1403                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
1404                         return false;
1405                 }
1406
1407                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
1408                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
1409                         return false;
1410                 }
1411
1412                 if (!empty($item['uid']) && Contact::isBlockedByUser($item['owner-id'], $item['uid'])) {
1413                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $item['uid'], 'item-uri' => $item['uri']]);
1414                         return false;
1415                 }
1416
1417                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
1418                 if (!empty($item['uid']) && !empty($item['causer-id']) && Contact::isBlockedByUser($item['causer-id'], $item['uid'])) {
1419                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'], 'uid' => $item['uid'], 'item-uri' => $item['uri']]);
1420                         return false;
1421                 }
1422
1423                 if (!empty($item['uid']) && !empty($item['causer-id']) && ($item['parent-uri'] == $item['uri']) && Contact::isIgnoredByUser($item['causer-id'], $item['uid'])) {
1424                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'], 'uid' => $item['uid'], 'item-uri' => $item['uri']]);
1425                         return false;
1426                 }
1427
1428                 if ($item['verb'] == Activity::FOLLOW) {
1429                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
1430                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
1431                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
1432                                 return false;
1433                         }
1434
1435                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
1436                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
1437                         if (self::exists($condition)) {
1438                                 // It happens that we receive multiple follow requests by the same author - we only store one.
1439                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
1440                                 return false;
1441                         }
1442                 }
1443
1444                 return true;
1445         }
1446
1447         /**
1448          * Return the id of the given item array if it has been stored before
1449          *
1450          * @param array $item
1451          * @return integer item id
1452          */
1453         private static function getDuplicateID(array $item)
1454         {
1455                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
1456                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
1457                                 trim($item['uri']), $item['uid'],
1458                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
1459                         $existing = self::selectFirst(['id', 'network'], $condition);
1460                         if (DBA::isResult($existing)) {
1461                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
1462                                 if ($item['uid'] != 0) {
1463                                         Logger::notice('Item already existed for user', [
1464                                                 'uri' => $item['uri'],
1465                                                 'uid' => $item['uid'],
1466                                                 'network' => $item['network'],
1467                                                 'existing_id' => $existing["id"],
1468                                                 'existing_network' => $existing["network"]
1469                                         ]);
1470                                 }
1471
1472                                 return $existing["id"];
1473                         }
1474                 }
1475                 return 0;
1476         }
1477
1478         /**
1479          * Fetch parent data for the given item array
1480          *
1481          * @param array $item
1482          * @return array item array with parent data
1483          */
1484         private static function getParentData(array $item)
1485         {
1486                 // find the parent and snarf the item id and ACLs
1487                 // and anything else we need to inherit
1488
1489                 $fields = ['uri', 'parent-uri', 'id', 'deleted',
1490                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
1491                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
1492                 $condition = ['uri' => $item['parent-uri'], 'uid' => $item['uid']];
1493                 $params = ['order' => ['id' => false]];
1494                 $parent = self::selectFirst($fields, $condition, $params);
1495
1496                 if (!DBA::isResult($parent)) {
1497                         Logger::info('item parent was not found - ignoring item', ['parent-uri' => $item['parent-uri'], 'uid' => $item['uid']]);
1498                         return [];
1499                 } else {
1500                         // is the new message multi-level threaded?
1501                         // even though we don't support it now, preserve the info
1502                         // and re-attach to the conversation parent.
1503                         if ($parent['uri'] != $parent['parent-uri']) {
1504                                 $item['parent-uri'] = $parent['parent-uri'];
1505
1506                                 $condition = ['uri' => $item['parent-uri'],
1507                                         'parent-uri' => $item['parent-uri'],
1508                                         'uid' => $item['uid']];
1509                                 $params = ['order' => ['id' => false]];
1510                                 $toplevel_parent = self::selectFirst($fields, $condition, $params);
1511
1512                                 if (DBA::isResult($toplevel_parent)) {
1513                                         $parent = $toplevel_parent;
1514                                 }
1515                         }
1516
1517                         $item['parent']        = $parent['id'];
1518                         $item["deleted"]       = $parent['deleted'];
1519                         $item["allow_cid"]     = $parent['allow_cid'];
1520                         $item['allow_gid']     = $parent['allow_gid'];
1521                         $item['deny_cid']      = $parent['deny_cid'];
1522                         $item['deny_gid']      = $parent['deny_gid'];
1523                         $item['parent_origin'] = $parent['origin'];
1524
1525                         // Don't federate received participation messages
1526                         if ($item['verb'] != Activity::FOLLOW) {
1527                                 $item['wall'] = $parent['wall'];
1528                         } else {
1529                                 $item['wall'] = false;
1530                         }
1531
1532                         /*
1533                          * If the parent is private, force privacy for the entire conversation
1534                          * This differs from the above settings as it subtly allows comments from
1535                          * email correspondents to be private even if the overall thread is not.
1536                          */
1537                         if ($parent['private']) {
1538                                 $item['private'] = $parent['private'];
1539                         }
1540
1541                         /*
1542                          * Edge case. We host a public forum that was originally posted to privately.
1543                          * The original author commented, but as this is a comment, the permissions
1544                          * weren't fixed up so it will still show the comment as private unless we fix it here.
1545                          */
1546                         if ((intval($parent['forum_mode']) == 1) && ($parent['private'] != self::PUBLIC)) {
1547                                 $item['private'] = self::PUBLIC;
1548                         }
1549
1550                         // If its a post that originated here then tag the thread as "mention"
1551                         if ($item['origin'] && $item['uid']) {
1552                                 DBA::update('thread', ['mention' => true], ['iid' => $item['parent']]);
1553                                 Logger::info('tagged thread as mention', ['parent' => $item['parent'], 'uid' => $item['uid']]);
1554                         }
1555
1556                         // Update the contact relations
1557                         if ($item['author-id'] != $parent['author-id']) {
1558                                 DBA::update('contact-relation', ['last-interaction' => $item['created']], ['cid' => $parent['author-id'], 'relation-cid' => $item['author-id']], true);
1559                         }
1560                 }
1561
1562                 return $item;
1563         }
1564
1565         /**
1566          * Get the gravity for the given item array
1567          *
1568          * @param array $item
1569          * @return integer gravity
1570          */
1571         private static function getGravity(array $item)
1572         {
1573                 $activity = DI::activity();
1574
1575                 if (isset($item['gravity'])) {
1576                         return intval($item['gravity']);
1577                 } elseif ($item['parent-uri'] === $item['uri']) {
1578                         return GRAVITY_PARENT;
1579                 } elseif ($activity->match($item['verb'], Activity::POST)) {
1580                         return GRAVITY_COMMENT;
1581                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
1582                         return GRAVITY_ACTIVITY;
1583                 }
1584                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
1585                 return GRAVITY_UNKNOWN;   // Should not happen
1586         }
1587
1588         public static function insert($item, $notify = false, $dontcache = false)
1589         {
1590                 $structure = self::getItemFields();
1591
1592                 $orig_item = $item;
1593
1594                 $priority = PRIORITY_HIGH;
1595
1596                 // If it is a posting where users should get notifications, then define it as wall posting
1597                 if ($notify) {
1598                         $item['wall'] = 1;
1599                         $item['origin'] = 1;
1600                         $item['network'] = Protocol::DFRN;
1601                         $item['protocol'] = Conversation::PARCEL_DFRN;
1602
1603                         if (is_int($notify)) {
1604                                 $priority = $notify;
1605                         }
1606                 } else {
1607                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
1608                 }
1609
1610                 $uid = intval($item['uid']);
1611
1612                 $item['guid'] = self::guid($item, $notify);
1613                 $item['uri'] = substr(Strings::escapeTags(trim(($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']))), 0, 255);
1614
1615                 // Store URI data
1616                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
1617
1618                 // Store conversation data
1619                 $item = Conversation::insert($item);
1620
1621                 if (!empty($item['thr-parent'])) {
1622                         $item['parent-uri'] = $item['thr-parent'];
1623                 }
1624
1625                 /*
1626                  * Do we already have this item?
1627                  * We have to check several networks since Friendica posts could be repeated
1628                  * via OStatus (maybe Diasporsa as well)
1629                  */
1630                 $duplicate = self::getDuplicateID($item);
1631                 if ($duplicate) {
1632                         return $duplicate;
1633                 }
1634
1635                 // Additional duplicate checks
1636                 /// @todo Check why the first duplication check returns the item number and the second a 0
1637                 if (self::isDuplicate($item)) {
1638                         return 0;
1639                 }
1640
1641                 $item['wall']          = intval($item['wall'] ?? 0);
1642                 $item['extid']         = trim($item['extid'] ?? '');
1643                 $item['author-name']   = trim($item['author-name'] ?? '');
1644                 $item['author-link']   = trim($item['author-link'] ?? '');
1645                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
1646                 $item['owner-name']    = trim($item['owner-name'] ?? '');
1647                 $item['owner-link']    = trim($item['owner-link'] ?? '');
1648                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
1649                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
1650                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
1651                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
1652                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
1653                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
1654                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
1655                 $item['location']      = trim($item['location'] ?? '');
1656                 $item['coord']         = trim($item['coord'] ?? '');
1657                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
1658                 $item['deleted']       = 0;
1659                 $item['parent-uri']    = trim(($item['parent-uri'] ?? '') ?: $item['uri']);
1660                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
1661                 $item['verb']          = trim($item['verb'] ?? '');
1662                 $item['object-type']   = trim($item['object-type'] ?? '');
1663                 $item['object']        = trim($item['object'] ?? '');
1664                 $item['target-type']   = trim($item['target-type'] ?? '');
1665                 $item['target']        = trim($item['target'] ?? '');
1666                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
1667                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
1668                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
1669                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
1670                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
1671                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
1672                 $item['body']          = trim($item['body'] ?? '');
1673                 $item['attach']        = trim($item['attach'] ?? '');
1674                 $item['app']           = trim($item['app'] ?? '');
1675                 $item['origin']        = intval($item['origin'] ?? 0);
1676                 $item['postopts']      = trim($item['postopts'] ?? '');
1677                 $item['resource-id']   = trim($item['resource-id'] ?? '');
1678                 $item['event-id']      = intval($item['event-id'] ?? 0);
1679                 $item['inform']        = trim($item['inform'] ?? '');
1680                 $item['file']          = trim($item['file'] ?? '');
1681
1682                 // Items cannot be stored before they happen ...
1683                 if ($item['created'] > DateTimeFormat::utcNow()) {
1684                         $item['created'] = DateTimeFormat::utcNow();
1685                 }
1686
1687                 // We haven't invented time travel by now.
1688                 if ($item['edited'] > DateTimeFormat::utcNow()) {
1689                         $item['edited'] = DateTimeFormat::utcNow();
1690                 }
1691
1692                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
1693
1694                 $item['language'] = self::getLanguage($item);
1695
1696                 $item['gravity'] = self::getGravity($item);
1697
1698                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
1699                         'photo' => $item['author-avatar'], 'network' => $item['network']];
1700                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
1701
1702                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
1703                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
1704                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
1705
1706                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
1707                 $item["contact-id"] = self::contactId($item);
1708
1709                 if (!self::isValid($item)) {
1710                         return 0;
1711                 }
1712
1713                 // We don't store the causer, we only have it here for the checks in the function above
1714                 unset($item['causer-id']);
1715                 unset($item['causer-link']);
1716
1717                 // We don't store these fields anymore in the item table
1718                 unset($item['author-link']);
1719                 unset($item['author-name']);
1720                 unset($item['author-avatar']);
1721                 unset($item['author-network']);
1722
1723                 unset($item['owner-link']);
1724                 unset($item['owner-name']);
1725                 unset($item['owner-avatar']);
1726
1727                 $item['thr-parent'] = $item['parent-uri'];
1728
1729                 if ($item['parent-uri'] != $item['uri']) {
1730                         $item = self::getParentData($item);
1731                         if (empty($item)) {
1732                                 return 0;
1733                         }
1734
1735                         $parent_id = $item['parent'];
1736                         unset($item['parent']);
1737                         $parent_origin = $item['parent_origin'];
1738                         unset($item['parent_origin']);
1739                 } else {
1740                         $parent_id = 0;
1741                         $parent_origin = $item['origin'];
1742                 }
1743
1744                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
1745                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
1746
1747                 // Is this item available in the global items (with uid=0)?
1748                 if ($item["uid"] == 0) {
1749                         $item["global"] = true;
1750
1751                         // Set the global flag on all items if this was a global item entry
1752                         DBA::update('item', ['global' => true], ['uri' => $item["uri"]]);
1753                 } else {
1754                         $item["global"] = self::exists(['uid' => 0, 'uri' => $item["uri"]]);
1755                 }
1756
1757                 // ACL settings
1758                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
1759                         $item["private"] = self::PRIVATE;
1760                 }
1761
1762                 if ($notify) {
1763                         $item['edit'] = false;
1764                         $item['parent'] = $parent_id;
1765                         Hook::callAll('post_local', $item);
1766                         unset($item['edit']);
1767                         unset($item['parent']);
1768                 } else {
1769                         Hook::callAll('post_remote', $item);
1770                 }
1771
1772                 if (!empty($item['cancel'])) {
1773                         Logger::log('post cancelled by addon.');
1774                         return 0;
1775                 }
1776
1777                 if (empty($item['vid']) && !empty($item['verb'])) {
1778                         $item['vid'] = Verb::getID($item['verb']);
1779                 }
1780
1781                 // Creates or assigns the permission set
1782                 $item['psid'] = PermissionSet::getIdFromACL(
1783                         $item['uid'],
1784                         $item['allow_cid'],
1785                         $item['allow_gid'],
1786                         $item['deny_cid'],
1787                         $item['deny_gid']
1788                 );
1789
1790                 unset($item['allow_cid']);
1791                 unset($item['allow_gid']);
1792                 unset($item['deny_cid']);
1793                 unset($item['deny_gid']);
1794
1795                 // This array field is used to trigger some automatic reactions
1796                 // It is mainly used in the "post_local" hook.
1797                 unset($item['api_source']);
1798
1799
1800                 // Check for hashtags in the body and repair or add hashtag links
1801                 $item['body'] = self::setHashtags($item['body']);
1802
1803                 // Fill the cache field
1804                 self::putInCache($item);
1805
1806                 if (stristr($item['verb'], Activity::POKE)) {
1807                         $notify_type = Delivery::POKE;
1808                 } else {
1809                         $notify_type = Delivery::POST;
1810                 }
1811
1812                 $like_no_comment = DI::config()->get('system', 'like_no_comment');
1813
1814                 DBA::transaction();
1815
1816                 if (!in_array($item['verb'], self::ACTIVITIES)) {
1817                         $item['icid'] = self::insertContent($item);
1818                 }
1819
1820                 $body = $item['body'];
1821
1822                 // We just remove everything that is content
1823                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1824                         unset($item[$field]);
1825                 }
1826
1827                 unset($item['activity']);
1828
1829                 // Filling item related side tables
1830
1831                 // Diaspora signature
1832                 if (!empty($item['diaspora_signed_text'])) {
1833                         DBA::insert('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']], true);
1834                 }
1835
1836                 unset($item['diaspora_signed_text']);
1837
1838                 // Attached file links
1839                 if (!empty($item['file'])) {
1840                         Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1841                 }
1842
1843                 unset($item['file']);
1844
1845                 // Delivery relevant data
1846                 $delivery_data = Post\DeliveryData::extractFields($item);
1847                 unset($item['postopts']);
1848                 unset($item['inform']);
1849
1850                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1851                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1852                 }
1853
1854                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1855                 if (!Tag::existsForPost($item['uri-id'])) {
1856                         Tag::storeFromBody($item['uri-id'], $body);
1857                 }
1858
1859                 // Remove all fields that aren't part of the item table
1860                 foreach ($item as $field => $value) {
1861                         if (!in_array($field, $structure['item'])) {
1862                                 unset($item[$field]);
1863                         }
1864                 }
1865
1866                 $ret = DBA::insert('item', $item);
1867
1868                 // When the item was successfully stored we fetch the ID of the item.
1869                 if (DBA::isResult($ret)) {
1870                         $current_post = DBA::lastInsertId();
1871                 } else {
1872                         // This can happen - for example - if there are locking timeouts.
1873                         DBA::rollback();
1874
1875                         // Store the data into a spool file so that we can try again later.
1876                         self::spool($orig_item);
1877                         return 0;
1878                 }
1879
1880                 if ($current_post == 0) {
1881                         // This is one of these error messages that never should occur.
1882                         Logger::log("couldn't find created item - we better quit now.");
1883                         DBA::rollback();
1884                         return 0;
1885                 }
1886
1887                 // How much entries have we created?
1888                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
1889                 $entries = DBA::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
1890
1891                 if ($entries > 1) {
1892                         // There are duplicates. We delete our just created entry.
1893                         Logger::info('Delete duplicated item', ['id' => $current_post, 'uri' => $item['uri'], 'uid' => $item['uid'], 'guid' => $item['guid']]);
1894
1895                         // Yes, we could do a rollback here - but we possibly are still having users with MyISAM.
1896                         DBA::delete('item', ['id' => $current_post]);
1897                         DBA::commit();
1898                         return 0;
1899                 } elseif ($entries == 0) {
1900                         // This really should never happen since we quit earlier if there were problems.
1901                         Logger::log("Something is terribly wrong. We haven't found our created entry.");
1902                         DBA::rollback();
1903                         return 0;
1904                 }
1905
1906                 Logger::log('created item '.$current_post);
1907
1908                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
1909                         $parent_id = $current_post;
1910                 }
1911
1912                 // Set parent id
1913                 DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1914
1915                 $item['id'] = $current_post;
1916                 $item['parent'] = $parent_id;
1917
1918                 // update the commented timestamp on the parent
1919                 // Only update "commented" if it is really a comment
1920                 if (($item['gravity'] != GRAVITY_ACTIVITY) || !$like_no_comment) {
1921                         DBA::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1922                 } else {
1923                         DBA::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1924                 }
1925
1926                 if ($item['parent-uri'] === $item['uri']) {
1927                         self::addThread($current_post);
1928                 } else {
1929                         self::updateThread($parent_id);
1930                 }
1931                 DBA::commit();
1932
1933                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1934                 if (self::tagDeliver($item['uid'], $current_post)) {
1935                         // Get the user information for the logging
1936                         $user = User::getById($uid);
1937
1938                         Logger::notice('Item had been deleted', ['id' => $current_post, 'user' => $uid, 'account-type' => $user['account-type']]);
1939                         return 0;
1940                 }
1941
1942                 if (!$dontcache) {
1943                         $posted_item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1944                         if (DBA::isResult($posted_item)) {
1945                                 if ($notify) {
1946                                         Hook::callAll('post_local_end', $posted_item);
1947                                 } else {
1948                                         Hook::callAll('post_remote_end', $posted_item);
1949                                 }
1950                         } else {
1951                                 Logger::log('new item not found in DB, id ' . $current_post);
1952                         }
1953                 }
1954
1955                 if ($item['parent-uri'] === $item['uri']) {
1956                         self::addShadow($current_post);
1957                 } else {
1958                         self::addShadowPost($current_post);
1959                 }
1960
1961                 self::updateContact($item);
1962
1963                 UserItem::setNotification($current_post);
1964
1965                 check_user_notification($current_post);
1966
1967                 $transmit = $notify || ($item['visible'] && ($parent_origin || $item['origin']));
1968
1969                 if ($transmit) {
1970                         $transmit_item = Item::selectFirst(['verb', 'origin'], ['id' => $item['id']]);
1971                         // Don't relay participation messages
1972                         if (($transmit_item['verb'] == Activity::FOLLOW) &&
1973                                 (!$transmit_item['origin'] || ($item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1974                                 Logger::info('Participation messages will not be relayed', ['item' => $item['id'], 'uri' => $item['uri'], 'verb' => $transmit_item['verb']]);
1975                                 $transmit = false;
1976                         }
1977                 }
1978
1979                 if ($transmit) {
1980                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
1981                 }
1982
1983                 return $current_post;
1984         }
1985
1986         /**
1987          * Insert a new item content entry
1988          *
1989          * @param array $item The item fields that are to be inserted
1990          * @throws \Exception
1991          */
1992         private static function insertContent(array $item)
1993         {
1994                 $fields = ['uri-plink-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
1995
1996                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1997                         if (isset($item[$field])) {
1998                                 $fields[$field] = $item[$field];
1999                         }
2000                 }
2001
2002                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-id' => $item['uri-id']]);
2003                 if (DBA::isResult($item_content)) {
2004                         $icid = $item_content['id'];
2005                         Logger::info('Content found', ['icid' => $icid, 'uri' => $item['uri']]);
2006                         return $icid;
2007                 }
2008
2009                 DBA::insert('item-content', $fields, true);
2010                 $icid = DBA::lastInsertId();
2011                 if ($icid != 0) {
2012                         Logger::info('Content inserted', ['icid' => $icid, 'uri' => $item['uri']]);
2013                         return $icid;
2014                 }
2015
2016                 // Possibly there can be timing issues. Then the same content could be inserted multiple times.
2017                 // Due to the indexes this doesn't happen, but "lastInsertId" will be empty in these situations.
2018                 // So we have to fetch the id manually. This is no bug and there is no data loss.
2019                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-id' => $item['uri-id']]);
2020                 if (DBA::isResult($item_content)) {
2021                         $icid = $item_content['id'];
2022                         Logger::notice('Content inserted with empty lastInsertId', ['icid' => $icid, 'uri' => $item['uri']]);
2023                         return $icid;
2024                 }
2025
2026                 // This shouldn't happen.
2027                 Logger::error("Content wasn't inserted", $item);
2028                 return null;
2029         }
2030
2031         /**
2032          * Update existing item content entries
2033          *
2034          * @param array $item      The item fields that are to be changed
2035          * @param array $condition The condition for finding the item content entries
2036          * @throws \Exception
2037          */
2038         private static function updateContent($item, $condition)
2039         {
2040                 // We have to select only the fields from the "item-content" table
2041                 $fields = [];
2042                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
2043                         if (isset($item[$field])) {
2044                                 $fields[$field] = $item[$field];
2045                         }
2046                 }
2047
2048                 if (empty($fields)) {
2049                         return;
2050                 }
2051
2052                 DBA::update('item-content', $fields, $condition, true);
2053                 Logger::info('Updated content', ['condition' => $condition]);
2054         }
2055
2056         /**
2057          * Distributes public items to the receivers
2058          *
2059          * @param integer $itemid      Item ID that should be added
2060          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
2061          * @throws \Exception
2062          */
2063         public static function distribute($itemid, $signed_text = '')
2064         {
2065                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
2066                 $parent = self::selectFirst(['owner-id'], $condition);
2067                 if (!DBA::isResult($parent)) {
2068                         return;
2069                 }
2070
2071                 // Only distribute public items from native networks
2072                 $condition = ['id' => $itemid, 'uid' => 0,
2073                         'network' => array_merge(Protocol::FEDERATED ,['']),
2074                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
2075                 $item = self::selectFirst(self::ITEM_FIELDLIST, $condition);
2076                 if (!DBA::isResult($item)) {
2077                         return;
2078                 }
2079
2080                 $origin = $item['origin'];
2081
2082                 unset($item['id']);
2083                 unset($item['parent']);
2084                 unset($item['mention']);
2085                 unset($item['wall']);
2086                 unset($item['origin']);
2087                 unset($item['starred']);
2088
2089                 $users = [];
2090
2091                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
2092                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
2093                 if (!DBA::isResult($owner)) {
2094                         return;
2095                 }
2096
2097                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2098                 $contacts = DBA::select('contact', ['uid'], $condition);
2099                 while ($contact = DBA::fetch($contacts)) {
2100                         if ($contact['uid'] == 0) {
2101                                 continue;
2102                         }
2103
2104                         $users[$contact['uid']] = $contact['uid'];
2105                 }
2106                 DBA::close($contacts);
2107
2108                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
2109                 $contacts = DBA::select('contact', ['uid'], $condition);
2110                 while ($contact = DBA::fetch($contacts)) {
2111                         if ($contact['uid'] == 0) {
2112                                 continue;
2113                         }
2114
2115                         $users[$contact['uid']] = $contact['uid'];
2116                 }
2117                 DBA::close($contacts);
2118
2119                 if (!empty($owner['alias'])) {
2120                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
2121                         $contacts = DBA::select('contact', ['uid'], $condition);
2122                         while ($contact = DBA::fetch($contacts)) {
2123                                 if ($contact['uid'] == 0) {
2124                                         continue;
2125                                 }
2126
2127                                 $users[$contact['uid']] = $contact['uid'];
2128                         }
2129                         DBA::close($contacts);
2130                 }
2131
2132                 $origin_uid = 0;
2133
2134                 if ($item['uri'] != $item['parent-uri']) {
2135                         $parents = self::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
2136                         while ($parent = self::fetch($parents)) {
2137                                 $users[$parent['uid']] = $parent['uid'];
2138                                 if ($parent['origin'] && !$origin) {
2139                                         $origin_uid = $parent['uid'];
2140                                 }
2141                         }
2142                 }
2143
2144                 foreach ($users as $uid) {
2145                         if ($origin_uid == $uid) {
2146                                 $item['diaspora_signed_text'] = $signed_text;
2147                         }
2148                         self::storeForUser($itemid, $item, $uid);
2149                 }
2150         }
2151
2152         /**
2153          * Store public items for the receivers
2154          *
2155          * @param integer $itemid Item ID that should be added
2156          * @param array   $item   The item entry that will be stored
2157          * @param integer $uid    The user that will receive the item entry
2158          * @throws \Exception
2159          */
2160         private static function storeForUser($itemid, $item, $uid)
2161         {
2162                 $item['uid'] = $uid;
2163                 $item['origin'] = 0;
2164                 $item['wall'] = 0;
2165                 if ($item['uri'] == $item['parent-uri']) {
2166                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
2167                 } else {
2168                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
2169                 }
2170
2171                 if (empty($item['contact-id'])) {
2172                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
2173                         if (!DBA::isResult($self)) {
2174                                 return;
2175                         }
2176                         $item['contact-id'] = $self['id'];
2177                 }
2178
2179                 /// @todo Handling of "event-id"
2180
2181                 $notify = false;
2182                 if ($item['uri'] == $item['parent-uri']) {
2183                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
2184                         if (DBA::isResult($contact)) {
2185                                 $notify = self::isRemoteSelf($contact, $item);
2186                         }
2187                 }
2188
2189                 $distributed = self::insert($item, $notify, true);
2190
2191                 if (!$distributed) {
2192                         Logger::info("Distributed public item wasn't stored", ['id' => $itemid, 'user' => $uid]);
2193                 } else {
2194                         Logger::info('Distributed public item was stored', ['id' => $itemid, 'user' => $uid, 'stored' => $distributed]);
2195                 }
2196         }
2197
2198         /**
2199          * Add a shadow entry for a given item id that is a thread starter
2200          *
2201          * We store every public item entry additionally with the user id "0".
2202          * This is used for the community page and for the search.
2203          * It is planned that in the future we will store public item entries only once.
2204          *
2205          * @param integer $itemid Item ID that should be added
2206          * @throws \Exception
2207          */
2208         public static function addShadow($itemid)
2209         {
2210                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri'];
2211                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
2212                 $item = self::selectFirst($fields, $condition);
2213
2214                 if (!DBA::isResult($item)) {
2215                         return;
2216                 }
2217
2218                 // is it already a copy?
2219                 if (($itemid == 0) || ($item['uid'] == 0)) {
2220                         return;
2221                 }
2222
2223                 // Is it a visible public post?
2224                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || ($item["private"] == Item::PRIVATE)) {
2225                         return;
2226                 }
2227
2228                 // is it an entry from a connector? Only add an entry for natively connected networks
2229                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
2230                         return;
2231                 }
2232
2233                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2234                         return;
2235                 }
2236
2237                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2238
2239                 if (DBA::isResult($item)) {
2240                         // Preparing public shadow (removing user specific data)
2241                         $item['uid'] = 0;
2242                         unset($item['id']);
2243                         unset($item['parent']);
2244                         unset($item['wall']);
2245                         unset($item['mention']);
2246                         unset($item['origin']);
2247                         unset($item['starred']);
2248                         unset($item['postopts']);
2249                         unset($item['inform']);
2250                         if ($item['uri'] == $item['parent-uri']) {
2251                                 $item['contact-id'] = $item['owner-id'];
2252                         } else {
2253                                 $item['contact-id'] = $item['author-id'];
2254                         }
2255
2256                         $public_shadow = self::insert($item, false, true);
2257
2258                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
2259                 }
2260         }
2261
2262         /**
2263          * Add a shadow entry for a given item id that is a comment
2264          *
2265          * This function does the same like the function above - but for comments
2266          *
2267          * @param integer $itemid Item ID that should be added
2268          * @throws \Exception
2269          */
2270         public static function addShadowPost($itemid)
2271         {
2272                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
2273                 if (!DBA::isResult($item)) {
2274                         return;
2275                 }
2276
2277                 // Is it a toplevel post?
2278                 if ($item['gravity'] == GRAVITY_PARENT) {
2279                         self::addShadow($itemid);
2280                         return;
2281                 }
2282
2283                 // Is this a shadow entry?
2284                 if ($item['uid'] == 0) {
2285                         return;
2286                 }
2287
2288                 // Is there a shadow parent?
2289                 if (!self::exists(['uri' => $item['parent-uri'], 'uid' => 0])) {
2290                         return;
2291                 }
2292
2293                 // Is there already a shadow entry?
2294                 if (self::exists(['uri' => $item['uri'], 'uid' => 0])) {
2295                         return;
2296                 }
2297
2298                 // Save "origin" and "parent" state
2299                 $origin = $item['origin'];
2300                 $parent = $item['parent'];
2301
2302                 // Preparing public shadow (removing user specific data)
2303                 $item['uid'] = 0;
2304                 unset($item['id']);
2305                 unset($item['parent']);
2306                 unset($item['wall']);
2307                 unset($item['mention']);
2308                 unset($item['origin']);
2309                 unset($item['starred']);
2310                 unset($item['postopts']);
2311                 unset($item['inform']);
2312                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
2313
2314                 $public_shadow = self::insert($item, false, true);
2315
2316                 Logger::info('Stored public shadow', ['uri' => $item['uri'], 'id' => $public_shadow]);
2317
2318                 // If this was a comment to a Diaspora post we don't get our comment back.
2319                 // This means that we have to distribute the comment by ourselves.
2320                 if ($origin && self::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
2321                         self::distribute($public_shadow);
2322                 }
2323         }
2324
2325         /**
2326          * Adds a language specification in a "language" element of given $arr.
2327          * Expects "body" element to exist in $arr.
2328          *
2329          * @param array $item
2330          * @return string detected language
2331          * @throws \Text_LanguageDetect_Exception
2332          */
2333         private static function getLanguage(array $item)
2334         {
2335                 $naked_body = BBCode::toPlaintext($item['body'], false);
2336
2337                 $ld = new Text_LanguageDetect();
2338                 $ld->setNameMode(2);
2339                 $languages = $ld->detect($naked_body, 3);
2340                 if (is_array($languages)) {
2341                         return json_encode($languages);
2342                 }
2343
2344                 return '';
2345         }
2346
2347         /**
2348          * Creates an unique guid out of a given uri
2349          *
2350          * @param string $uri uri of an item entry
2351          * @param string $host hostname for the GUID prefix
2352          * @return string unique guid
2353          */
2354         public static function guidFromUri($uri, $host)
2355         {
2356                 // Our regular guid routine is using this kind of prefix as well
2357                 // We have to avoid that different routines could accidentally create the same value
2358                 $parsed = parse_url($uri);
2359
2360                 // We use a hash of the hostname as prefix for the guid
2361                 $guid_prefix = hash("crc32", $host);
2362
2363                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
2364                 unset($parsed["scheme"]);
2365
2366                 // Glue it together to be able to make a hash from it
2367                 $host_id = implode("/", $parsed);
2368
2369                 // We could use any hash algorithm since it isn't a security issue
2370                 $host_hash = hash("ripemd128", $host_id);
2371
2372                 return $guid_prefix.$host_hash;
2373         }
2374
2375         /**
2376          * generate an unique URI
2377          *
2378          * @param integer $uid  User id
2379          * @param string  $guid An existing GUID (Otherwise it will be generated)
2380          *
2381          * @return string
2382          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2383          */
2384         public static function newURI($uid, $guid = "")
2385         {
2386                 if ($guid == "") {
2387                         $guid = System::createUUID();
2388                 }
2389
2390                 return DI::baseUrl()->get() . '/objects/' . $guid;
2391         }
2392
2393         /**
2394          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
2395          *
2396          * This can be used to filter for inactive contacts.
2397          * Only do this for public postings to avoid privacy problems, since poco data is public.
2398          * Don't set this value if it isn't from the owner (could be an author that we don't know)
2399          *
2400          * @param array $arr Contains the just posted item record
2401          * @throws \Exception
2402          */
2403         private static function updateContact($arr)
2404         {
2405                 // Unarchive the author
2406                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
2407                 if (DBA::isResult($contact)) {
2408                         Contact::unmarkForArchival($contact);
2409                 }
2410
2411                 // Unarchive the contact if it's not our own contact
2412                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
2413                 if (DBA::isResult($contact)) {
2414                         Contact::unmarkForArchival($contact);
2415                 }
2416
2417                 /// @todo On private posts we could obfuscate the date
2418                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
2419
2420                 // Is it a forum? Then we don't care about the rules from above
2421                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri"] === $arr["uri"])) {
2422                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
2423                                 $update = true;
2424                         }
2425                 }
2426
2427                 if ($update) {
2428                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
2429                         // So we have to ensure to only update the last item when it had been our own post,
2430                         // or it had been done by a "regular" contact.
2431                         if (!empty($arr['wall'])) {
2432                                 $condition = ['id' => $arr['contact-id']];
2433                         } else {
2434                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
2435                         }
2436                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
2437                 }
2438                 // Now do the same for the system wide contacts with uid=0
2439                 if ($arr['private'] != self::PRIVATE) {
2440                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
2441                                 ['id' => $arr['owner-id']]);
2442
2443                         if ($arr['owner-id'] != $arr['author-id']) {
2444                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
2445                                         ['id' => $arr['author-id']]);
2446                         }
2447                 }
2448         }
2449
2450         public static function setHashtags($body)
2451         {
2452                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code'], function ($body) {
2453                         $tags = BBCode::getTags($body);
2454
2455                         // No hashtags?
2456                         if (!count($tags)) {
2457                                 return $body;
2458                         }
2459
2460                         // This sorting is important when there are hashtags that are part of other hashtags
2461                         // Otherwise there could be problems with hashtags like #test and #test2
2462                         // Because of this we are sorting from the longest to the shortest tag.
2463                         usort($tags, function ($a, $b) {
2464                                 return strlen($b) <=> strlen($a);
2465                         });
2466
2467                         $URLSearchString = "^\[\]";
2468
2469                         // All hashtags should point to the home server if "local_tags" is activated
2470                         if (DI::config()->get('system', 'local_tags')) {
2471                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2472                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
2473                         }
2474
2475                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
2476                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2477                                 function ($match) {
2478                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
2479                                 }, $body);
2480
2481                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
2482                                 function ($match) {
2483                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
2484                                 }, $body);
2485
2486                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
2487                                 function ($match) {
2488                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
2489                                 }, $body);
2490
2491                         // Repair recursive urls
2492                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
2493                                 "&num;$2", $body);
2494
2495                         foreach ($tags as $tag) {
2496                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
2497                                         continue;
2498                                 }
2499
2500                                 $basetag = str_replace('_', ' ', substr($tag, 1));
2501                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
2502
2503                                 $body = str_replace($tag, $newtag, $body);
2504                         }
2505
2506                         // Convert back the masked hashtags
2507                         $body = str_replace("&num;", "#", $body);
2508
2509                         return $body;
2510                 });
2511
2512                 return $body;
2513         }
2514
2515         /**
2516          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
2517          *
2518          * @param int $uid
2519          * @param int $item_id
2520          * @return boolean true if item was deleted, else false
2521          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2522          * @throws \ImagickException
2523          */
2524         private static function tagDeliver($uid, $item_id)
2525         {
2526                 $mention = false;
2527
2528                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
2529                 if (!DBA::isResult($user)) {
2530                         return false;
2531                 }
2532
2533                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
2534                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
2535
2536                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2537                 if (!DBA::isResult($item)) {
2538                         return false;
2539                 }
2540
2541                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
2542
2543                 /*
2544                  * Diaspora uses their own hardwired link URL in @-tags
2545                  * instead of the one we supply with webfinger
2546                  */
2547                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2548
2549                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2550                 if ($cnt) {
2551                         foreach ($matches as $mtch) {
2552                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2553                                         $mention = true;
2554                                         Logger::log('mention found: ' . $mtch[2]);
2555                                 }
2556                         }
2557                 }
2558
2559                 if (!$mention) {
2560                         if (($community_page || $prvgroup) &&
2561                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
2562                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item_id, 'guid'=> $item['guid']]);
2563                                 DBA::delete('item', ['id' => $item_id]);
2564                                 return true;
2565                         }
2566                         return false;
2567                 }
2568
2569                 $arr = ['item' => $item, 'user' => $user];
2570
2571                 Hook::callAll('tagged', $arr);
2572
2573                 if (!$community_page && !$prvgroup) {
2574                         return false;
2575                 }
2576
2577                 /*
2578                  * tgroup delivery - setup a second delivery chain
2579                  * prevent delivery looping - only proceed
2580                  * if the message originated elsewhere and is a top-level post
2581                  */
2582                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2583                         return false;
2584                 }
2585
2586                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2587                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2588                 if (!DBA::isResult($self)) {
2589                         return false;
2590                 }
2591
2592                 $owner_id = Contact::getIdForURL($self['url']);
2593
2594                 // also reset all the privacy bits to the forum default permissions
2595
2596                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
2597
2598                 $psid = PermissionSet::getIdFromACL(
2599                         $user['uid'],
2600                         $user['allow_cid'],
2601                         $user['allow_gid'],
2602                         $user['deny_cid'],
2603                         $user['deny_gid']
2604                 );
2605
2606                 $forum_mode = ($prvgroup ? 2 : 1);
2607
2608                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2609                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2610                 self::update($fields, ['id' => $item_id]);
2611
2612                 self::updateThread($item_id);
2613
2614                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, $item_id);
2615
2616                 return false;
2617         }
2618
2619         public static function isRemoteSelf($contact, &$datarray)
2620         {
2621                 if (!$contact['remote_self']) {
2622                         return false;
2623                 }
2624
2625                 // Prevent the forwarding of posts that are forwarded
2626                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2627                         Logger::info('Already forwarded');
2628                         return false;
2629                 }
2630
2631                 // Prevent to forward already forwarded posts
2632                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
2633                         Logger::info('Already forwarded (second test)');
2634                         return false;
2635                 }
2636
2637                 // Only forward posts
2638                 if ($datarray["verb"] != Activity::POST) {
2639                         Logger::info('No post');
2640                         return false;
2641                 }
2642
2643                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
2644                         Logger::info('Not public');
2645                         return false;
2646                 }
2647
2648                 $datarray2 = $datarray;
2649                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
2650                 if ($contact['remote_self'] == 2) {
2651                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2652                                         ['uid' => $contact['uid'], 'self' => true]);
2653                         if (DBA::isResult($self)) {
2654                                 $datarray['contact-id'] = $self["id"];
2655
2656                                 $datarray['owner-name'] = $self["name"];
2657                                 $datarray['owner-link'] = $self["url"];
2658                                 $datarray['owner-avatar'] = $self["thumb"];
2659
2660                                 $datarray['author-name']   = $datarray['owner-name'];
2661                                 $datarray['author-link']   = $datarray['owner-link'];
2662                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2663
2664                                 unset($datarray['edited']);
2665
2666                                 unset($datarray['network']);
2667                                 unset($datarray['owner-id']);
2668                                 unset($datarray['author-id']);
2669                         }
2670
2671                         if ($contact['network'] != Protocol::FEED) {
2672                                 $datarray["guid"] = System::createUUID();
2673                                 unset($datarray["plink"]);
2674                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2675                                 $datarray["parent-uri"] = $datarray["uri"];
2676                                 $datarray["thr-parent"] = $datarray["uri"];
2677                                 $datarray["extid"] = Protocol::DFRN;
2678                                 $urlpart = parse_url($datarray2['author-link']);
2679                                 $datarray["app"] = $urlpart["host"];
2680                         } else {
2681                                 $datarray['private'] = self::PUBLIC;
2682                         }
2683                 }
2684
2685                 if ($contact['network'] != Protocol::FEED) {
2686                         // Store the original post
2687                         $result = self::insert($datarray2);
2688                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
2689                 } else {
2690                         $datarray["app"] = "Feed";
2691                         $result = true;
2692                 }
2693
2694                 // Trigger automatic reactions for addons
2695                 $datarray['api_source'] = true;
2696
2697                 // We have to tell the hooks who we are - this really should be improved
2698                 $_SESSION["authenticated"] = true;
2699                 $_SESSION["uid"] = $contact['uid'];
2700
2701                 return $result;
2702         }
2703
2704         /**
2705          *
2706          * @param string $s
2707          * @param int    $uid
2708          * @param array  $item
2709          * @param int    $cid
2710          * @return string
2711          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2712          * @throws \ImagickException
2713          */
2714         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2715         {
2716                 if (DI::config()->get('system', 'disable_embedded')) {
2717                         return $s;
2718                 }
2719
2720                 Logger::info('check for photos');
2721                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
2722
2723                 $orig_body = $s;
2724                 $new_body = '';
2725
2726                 $img_start = strpos($orig_body, '[img');
2727                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2728                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2729
2730                 while (($img_st_close !== false) && ($img_len !== false)) {
2731                         $img_st_close++; // make it point to AFTER the closing bracket
2732                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2733
2734                         Logger::info('found photo', ['image' => $image]);
2735
2736                         if (stristr($image, $site . '/photo/')) {
2737                                 // Only embed locally hosted photos
2738                                 $replace = false;
2739                                 $i = basename($image);
2740                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2741                                 $x = strpos($i, '-');
2742
2743                                 if ($x) {
2744                                         $res = substr($i, $x + 1);
2745                                         $i = substr($i, 0, $x);
2746                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2747                                         if (DBA::isResult($photo)) {
2748                                                 /*
2749                                                  * Check to see if we should replace this photo link with an embedded image
2750                                                  * 1. No need to do so if the photo is public
2751                                                  * 2. If there's a contact-id provided, see if they're in the access list
2752                                                  *    for the photo. If so, embed it.
2753                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2754                                                  *    permissions, regardless of order but first check to see if they're an exact
2755                                                  *    match to save some processing overhead.
2756                                                  */
2757                                                 if (self::hasPermissions($photo)) {
2758                                                         if ($cid) {
2759                                                                 $recips = self::enumeratePermissions($photo);
2760                                                                 if (in_array($cid, $recips)) {
2761                                                                         $replace = true;
2762                                                                 }
2763                                                         } elseif ($item) {
2764                                                                 if (self::samePermissions($uid, $item, $photo)) {
2765                                                                         $replace = true;
2766                                                                 }
2767                                                         }
2768                                                 }
2769                                                 if ($replace) {
2770                                                         $photo_img = Photo::getImageForPhoto($photo);
2771                                                         // If a custom width and height were specified, apply before embedding
2772                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2773                                                                 Logger::info('scaling photo');
2774
2775                                                                 $width = intval($match[1]);
2776                                                                 $height = intval($match[2]);
2777
2778                                                                 $photo_img->scaleDown(max($width, $height));
2779                                                         }
2780
2781                                                         $data = $photo_img->asString();
2782                                                         $type = $photo_img->getType();
2783
2784                                                         Logger::info('replacing photo');
2785                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2786                                                         Logger::debug('replaced', ['image' => $image]);
2787                                                 }
2788                                         }
2789                                 }
2790                         }
2791
2792                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2793                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2794                         if ($orig_body === false) {
2795                                 $orig_body = '';
2796                         }
2797
2798                         $img_start = strpos($orig_body, '[img');
2799                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2800                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2801                 }
2802
2803                 $new_body = $new_body . $orig_body;
2804
2805                 return $new_body;
2806         }
2807
2808         private static function hasPermissions($obj)
2809         {
2810                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2811                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2812         }
2813
2814         private static function samePermissions($uid, $obj1, $obj2)
2815         {
2816                 // first part is easy. Check that these are exactly the same.
2817                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2818                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2819                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2820                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2821                         return true;
2822                 }
2823
2824                 // This is harder. Parse all the permissions and compare the resulting set.
2825                 $recipients1 = self::enumeratePermissions($obj1);
2826                 $recipients2 = self::enumeratePermissions($obj2);
2827                 sort($recipients1);
2828                 sort($recipients2);
2829
2830                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2831                 return ($recipients1 == $recipients2);
2832         }
2833
2834         /**
2835          * Returns an array of contact-ids that are allowed to see this object
2836          *
2837          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2838          * @param bool  $check_dead Prunes unavailable contacts from the result
2839          * @return array
2840          * @throws \Exception
2841          */
2842         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2843         {
2844                 $aclFormater = DI::aclFormatter();
2845
2846                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2847                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2848                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2849                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2850                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2851                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2852                 $recipients   = array_diff($recipients, $deny);
2853                 return $recipients;
2854         }
2855
2856         public static function expire($uid, $days, $network = "", $force = false)
2857         {
2858                 if (!$uid || ($days < 1)) {
2859                         return;
2860                 }
2861
2862                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2863                         $uid, GRAVITY_PARENT];
2864
2865                 /*
2866                  * $expire_network_only = save your own wall posts
2867                  * and just expire conversations started by others
2868                  */
2869                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2870
2871                 if ($expire_network_only) {
2872                         $condition[0] .= " AND NOT `wall`";
2873                 }
2874
2875                 if ($network != "") {
2876                         $condition[0] .= " AND `network` = ?";
2877                         $condition[] = $network;
2878                 }
2879
2880                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2881                 $condition[] = $days;
2882
2883                 $items = self::select(['file', 'resource-id', 'starred', 'type', 'id', 'post-type'], $condition);
2884
2885                 if (!DBA::isResult($items)) {
2886                         return;
2887                 }
2888
2889                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2890
2891                 // Forcing expiring of items - but not notes and marked items
2892                 if ($force) {
2893                         $expire_items = true;
2894                 }
2895
2896                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2897                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2898                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2899
2900                 $expired = 0;
2901
2902                 while ($item = Item::fetch($items)) {
2903                         // don't expire filed items
2904
2905                         if (strpos($item['file'], '[') !== false) {
2906                                 continue;
2907                         }
2908
2909                         // Only expire posts, not photos and photo comments
2910
2911                         if (!$expire_photos && strlen($item['resource-id'])) {
2912                                 continue;
2913                         } elseif (!$expire_starred && intval($item['starred'])) {
2914                                 continue;
2915                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == Item::PT_PERSONAL_NOTE))) {
2916                                 continue;
2917                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != Item::PT_PERSONAL_NOTE)) {
2918                                 continue;
2919                         }
2920
2921                         self::markForDeletionById($item['id'], PRIORITY_LOW);
2922
2923                         ++$expired;
2924                 }
2925                 DBA::close($items);
2926                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2927         }
2928
2929         public static function firstPostDate($uid, $wall = false)
2930         {
2931                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2932                 $params = ['order' => ['received' => false]];
2933                 $thread = DBA::selectFirst('thread', ['received'], $condition, $params);
2934                 if (DBA::isResult($thread)) {
2935                         return substr(DateTimeFormat::local($thread['received']), 0, 10);
2936                 }
2937                 return false;
2938         }
2939
2940         /**
2941          * add/remove activity to an item
2942          *
2943          * Toggle activities as like,dislike,attend of an item
2944          *
2945          * @param string $item_id
2946          * @param string $verb
2947          *            Activity verb. One of
2948          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2949          *            attendno, unattendno, attendmaybe, unattendmaybe
2950          * @return bool
2951          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2952          * @throws \ImagickException
2953          * @hook  'post_local_end'
2954          *            array $arr
2955          *            'post_id' => ID of posted item
2956          */
2957         public static function performActivity($item_id, $verb)
2958         {
2959                 if (!Session::isAuthenticated()) {
2960                         return false;
2961                 }
2962
2963                 Logger::log('like: verb ' . $verb . ' item ' . $item_id);
2964
2965                 $item = self::selectFirst(self::ITEM_FIELDLIST, ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
2966                 if (!DBA::isResult($item)) {
2967                         Logger::log('like: unknown item ' . $item_id);
2968                         return false;
2969                 }
2970
2971                 $item_uri = $item['uri'];
2972
2973                 $uid = $item['uid'];
2974                 if (($uid == 0) && local_user()) {
2975                         $uid = local_user();
2976                 }
2977
2978                 if (!Security::canWriteToUserWall($uid)) {
2979                         Logger::log('like: unable to write on wall ' . $uid);
2980                         return false;
2981                 }
2982
2983                 // Retrieves the local post owner
2984                 $owner_self_contact = DBA::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
2985                 if (!DBA::isResult($owner_self_contact)) {
2986                         Logger::log('like: unknown owner ' . $uid);
2987                         return false;
2988                 }
2989
2990                 // Retrieve the current logged in user's public contact
2991                 $author_id = public_contact();
2992
2993                 $author_contact = DBA::selectFirst('contact', ['url'], ['id' => $author_id]);
2994                 if (!DBA::isResult($author_contact)) {
2995                         Logger::log('like: unknown author ' . $author_id);
2996                         return false;
2997                 }
2998
2999                 // Contact-id is the uid-dependant author contact
3000                 if (local_user() == $uid) {
3001                         $item_contact_id = $owner_self_contact['id'];
3002                 } else {
3003                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, false);
3004                         $item_contact = DBA::selectFirst('contact', [], ['id' => $item_contact_id]);
3005                         if (!DBA::isResult($item_contact)) {
3006                                 Logger::log('like: unknown item contact ' . $item_contact_id);
3007                                 return false;
3008                         }
3009                 }
3010
3011                 $activity = null;
3012                 switch ($verb) {
3013                         case 'like':
3014                         case 'unlike':
3015                                 $activity = Activity::LIKE;
3016                                 break;
3017                         case 'dislike':
3018                         case 'undislike':
3019                                 $activity = Activity::DISLIKE;
3020                                 break;
3021                         case 'attendyes':
3022                         case 'unattendyes':
3023                                 $activity = Activity::ATTEND;
3024                                 break;
3025                         case 'attendno':
3026                         case 'unattendno':
3027                                 $activity = Activity::ATTENDNO;
3028                                 break;
3029                         case 'attendmaybe':
3030                         case 'unattendmaybe':
3031                                 $activity = Activity::ATTENDMAYBE;
3032                                 break;
3033                         case 'follow':
3034                         case 'unfollow':
3035                                 $activity = Activity::FOLLOW;
3036                                 break;
3037                         default:
3038                                 Logger::log('like: unknown verb ' . $verb . ' for item ' . $item_id);
3039                                 return false;
3040                 }
3041
3042                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
3043
3044                 // Enable activity toggling instead of on/off
3045                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
3046
3047                 // Look for an existing verb row
3048                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
3049                 if ($event_verb_flag) {
3050                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
3051
3052                         // Translate to the index based activity index
3053                         $vids = [];
3054                         foreach ($verbs as $verb) {
3055                                 $vids[] = Verb::getID($verb);
3056                         }
3057                 } else {
3058                         $vids = Verb::getID($activity);
3059                 }
3060
3061                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
3062                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent' => $item_uri];
3063                 $like_item = self::selectFirst(['id', 'guid', 'verb'], $condition);
3064
3065                 if (DBA::isResult($like_item)) {
3066                         /**
3067                          * Truth table for existing activities
3068                          *
3069                          * |          Inputs            ||      Outputs      |
3070                          * |----------------------------||-------------------|
3071                          * |  Mode  | Event | Same verb || Delete? | Return? |
3072                          * |--------|-------|-----------||---------|---------|
3073                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
3074                          * | create |  Yes  |    No     ||   Yes   |   No    |
3075                          * | create |  No   |    Yes    ||   No    |   Yes   |
3076                          * | create |  No   |    No     ||        N/A†       |
3077                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
3078                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
3079                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
3080                          * | delete |  No   |    No     ||        N/A†       |
3081                          * |--------|-------|-----------||---------|---------|
3082                          * |   A    |   B   |     C     || A xor C | !B or C |
3083                          *
3084                          * † Can't happen: It's impossible to find an existing non-event activity without
3085                          *                 the same verb because we are only looking for this single verb.
3086                          *
3087                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
3088                          */
3089                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
3090                                 self::markForDeletionById($like_item['id']);
3091                         }
3092
3093                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
3094                                 return true;
3095                         }
3096                 }
3097
3098                 // No need to go further if we aren't creating anything
3099                 if ($mode == 'delete') {
3100                         return true;
3101                 }
3102
3103                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
3104
3105                 $new_item = [
3106                         'guid'          => System::createUUID(),
3107                         'uri'           => self::newURI($item['uid']),
3108                         'uid'           => $item['uid'],
3109                         'contact-id'    => $item_contact_id,
3110                         'wall'          => $item['wall'],
3111                         'origin'        => 1,
3112                         'network'       => Protocol::DFRN,
3113                         'gravity'       => GRAVITY_ACTIVITY,
3114                         'parent'        => $item['id'],
3115                         'parent-uri'    => $item['uri'],
3116                         'thr-parent'    => $item['uri'],
3117                         'owner-id'      => $author_id,
3118                         'author-id'     => $author_id,
3119                         'body'          => $activity,
3120                         'verb'          => $activity,
3121                         'object-type'   => $objtype,
3122                         'allow_cid'     => $item['allow_cid'],
3123                         'allow_gid'     => $item['allow_gid'],
3124                         'deny_cid'      => $item['deny_cid'],
3125                         'deny_gid'      => $item['deny_gid'],
3126                         'visible'       => 1,
3127                         'unseen'        => 1,
3128                 ];
3129
3130                 $signed = Diaspora::createLikeSignature($uid, $new_item);
3131                 if (!empty($signed)) {
3132                         $new_item['diaspora_signed_text'] = json_encode($signed);
3133                 }
3134
3135                 $new_item_id = self::insert($new_item);
3136
3137                 // If the parent item isn't visible then set it to visible
3138                 if (!$item['visible']) {
3139                         self::update(['visible' => true], ['id' => $item['id']]);
3140                 }
3141
3142                 $new_item['id'] = $new_item_id;
3143
3144                 Hook::callAll('post_local_end', $new_item);
3145
3146                 return true;
3147         }
3148
3149         private static function addThread($itemid, $onlyshadow = false)
3150         {
3151                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
3152                         'moderated', 'visible', 'starred', 'contact-id', 'post-type', 'uri-id',
3153                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
3154                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3155                 $item = self::selectFirst($fields, $condition);
3156
3157                 if (!DBA::isResult($item)) {
3158                         return;
3159                 }
3160
3161                 $item['iid'] = $itemid;
3162
3163                 if (!$onlyshadow) {
3164                         $result = DBA::insert('thread', $item);
3165
3166                         Logger::info('Add thread', ['item' => $itemid, 'result' => $result]);
3167                 }
3168         }
3169
3170         private static function updateThread($itemid, $setmention = false)
3171         {
3172                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
3173                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id', 'uri-id',
3174                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
3175                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
3176
3177                 $item = self::selectFirst($fields, $condition);
3178                 if (!DBA::isResult($item)) {
3179                         return;
3180                 }
3181
3182                 if ($setmention) {
3183                         $item["mention"] = 1;
3184                 }
3185
3186                 $fields = [];
3187
3188                 foreach ($item as $field => $data) {
3189                         if (!in_array($field, ["guid"])) {
3190                                 $fields[$field] = $data;
3191                         }
3192                 }
3193
3194                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
3195
3196                 Logger::info('Update thread', ['item' => $itemid, 'guid' => $item["guid"], 'result' => $result]);
3197         }
3198
3199         private static function deleteThread($itemid, $itemuri = "")
3200         {
3201                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
3202                 if (!DBA::isResult($item)) {
3203                         Logger::info('No thread found', ['id' => $itemid]);
3204                         return;
3205                 }
3206
3207                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
3208
3209                 Logger::info('Deleted thread', ['item' => $itemid, 'result' => $result]);
3210
3211                 if ($itemuri != "") {
3212                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
3213                         if (!self::exists($condition)) {
3214                                 DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
3215                                 Logger::debug('Deleted shadow item', ['id' => $itemid, 'uri' => $itemuri]);
3216                         }
3217                 }
3218         }
3219
3220         public static function getPermissionsSQLByUserId($owner_id)
3221         {
3222                 $local_user = local_user();
3223                 $remote_user = Session::getRemoteContactID($owner_id);
3224
3225                 /*
3226                  * Construct permissions
3227                  *
3228                  * default permissions - anonymous user
3229                  */
3230                 $sql = sprintf(" AND `item`.`private` != %d", self::PRIVATE);
3231
3232                 // Profile owner - everything is visible
3233                 if ($local_user && ($local_user == $owner_id)) {
3234                         $sql = '';
3235                 } elseif ($remote_user) {
3236                         /*
3237                          * Authenticated visitor. Unless pre-verified,
3238                          * check that the contact belongs to this $owner_id
3239                          * and load the groups the visitor belongs to.
3240                          * If pre-verified, the caller is expected to have already
3241                          * done this and passed the groups into this function.
3242                          */
3243                         $set = PermissionSet::get($owner_id, $remote_user);
3244
3245                         if (!empty($set)) {
3246                                 $sql_set = sprintf(" OR (`item`.`private` = %d AND `item`.`wall` AND `item`.`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
3247                         } else {
3248                                 $sql_set = '';
3249                         }
3250
3251                         $sql = sprintf(" AND (`item`.`private` != %d", self::PRIVATE) . $sql_set . ")";
3252                 }
3253
3254                 return $sql;
3255         }
3256
3257         /**
3258          * get translated item type
3259          *
3260          * @param $item
3261          * @return string
3262          */
3263         public static function postType($item)
3264         {
3265                 if (!empty($item['event-id'])) {
3266                         return DI::l10n()->t('event');
3267                 } elseif (!empty($item['resource-id'])) {
3268                         return DI::l10n()->t('photo');
3269                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
3270                         return DI::l10n()->t('activity');
3271                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
3272                         return DI::l10n()->t('comment');
3273                 }
3274
3275                 return DI::l10n()->t('post');
3276         }
3277
3278         /**
3279          * Sets the "rendered-html" field of the provided item
3280          *
3281          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
3282          *
3283          * @param array $item
3284          * @param bool  $update
3285          *
3286          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3287          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
3288          */
3289         public static function putInCache(&$item, $update = false)
3290         {
3291                 $body = $item["body"];
3292
3293                 $rendered_hash = $item['rendered-hash'] ?? '';
3294                 $rendered_html = $item['rendered-html'] ?? '';
3295
3296                 if ($rendered_hash == ''
3297                         || $rendered_html == ""
3298                         || $rendered_hash != hash("md5", $item["body"])
3299                         || DI::config()->get("system", "ignore_cache")
3300                 ) {
3301                         self::addRedirToImageTags($item);
3302
3303                         $item["rendered-html"] = BBCode::convert($item["body"]);
3304                         $item["rendered-hash"] = hash("md5", $item["body"]);
3305
3306                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
3307                         Hook::callAll('put_item_in_cache', $hook_data);
3308                         $item['rendered-html'] = $hook_data['rendered-html'];
3309                         $item['rendered-hash'] = $hook_data['rendered-hash'];
3310                         unset($hook_data);
3311
3312                         // Force an update if the generated values differ from the existing ones
3313                         if ($rendered_hash != $item["rendered-hash"]) {
3314                                 $update = true;
3315                         }
3316
3317                         // Only compare the HTML when we forcefully ignore the cache
3318                         if (DI::config()->get("system", "ignore_cache") && ($rendered_html != $item["rendered-html"])) {
3319                                 $update = true;
3320                         }
3321
3322                         if ($update && !empty($item["id"])) {
3323                                 self::update(
3324                                         [
3325                                                 'rendered-html' => $item["rendered-html"],
3326                                                 'rendered-hash' => $item["rendered-hash"]
3327                                         ],
3328                                         ['id' => $item["id"]]
3329                                 );
3330                         }
3331                 }
3332
3333                 $item["body"] = $body;
3334         }
3335
3336         /**
3337          * Find any non-embedded images in private items and add redir links to them
3338          *
3339          * @param array &$item The field array of an item row
3340          */
3341         private static function addRedirToImageTags(array &$item)
3342         {
3343                 $app = DI::app();
3344
3345                 $matches = [];
3346                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
3347                 if ($cnt) {
3348                         foreach ($matches as $mtch) {
3349                                 if (strpos($mtch[1], '/redir') !== false) {
3350                                         continue;
3351                                 }
3352
3353                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
3354                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
3355                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
3356                                 }
3357                         }
3358                 }
3359         }
3360
3361         /**
3362          * Given an item array, convert the body element from bbcode to html and add smilie icons.
3363          * If attach is true, also add icons for item attachments.
3364          *
3365          * @param array   $item
3366          * @param boolean $attach
3367          * @param boolean $is_preview
3368          * @return string item body html
3369          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
3370          * @throws \ImagickException
3371          * @hook  prepare_body_init item array before any work
3372          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
3373          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
3374          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
3375          */
3376         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
3377         {
3378                 $a = DI::app();
3379                 Hook::callAll('prepare_body_init', $item);
3380
3381                 // In order to provide theme developers more possibilities, event items
3382                 // are treated differently.
3383                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
3384                         $ev = Event::getItemHTML($item);
3385                         return $ev;
3386                 }
3387
3388                 $tags = Tag::populateFromItem($item);
3389
3390                 $item['tags'] = $tags['tags'];
3391                 $item['hashtags'] = $tags['hashtags'];
3392                 $item['mentions'] = $tags['mentions'];
3393
3394                 // Compile eventual content filter reasons
3395                 $filter_reasons = [];
3396                 if (!$is_preview && public_contact() != $item['author-id']) {
3397                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
3398                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
3399                         }
3400
3401                         $hook_data = [
3402                                 'item' => $item,
3403                                 'filter_reasons' => $filter_reasons
3404                         ];
3405                         Hook::callAll('prepare_body_content_filter', $hook_data);
3406                         $filter_reasons = $hook_data['filter_reasons'];
3407                         unset($hook_data);
3408                 }
3409
3410                 // Update the cached values if there is no "zrl=..." on the links.
3411                 $update = (!Session::isAuthenticated() && ($item["uid"] == 0));
3412
3413                 // Or update it if the current viewer is the intented viewer.
3414                 if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
3415                         $update = true;
3416                 }
3417
3418                 self::putInCache($item, $update);
3419                 $s = $item["rendered-html"];
3420
3421                 $hook_data = [
3422                         'item' => $item,
3423                         'html' => $s,
3424                         'preview' => $is_preview,
3425                         'filter_reasons' => $filter_reasons
3426                 ];
3427                 Hook::callAll('prepare_body', $hook_data);
3428                 $s = $hook_data['html'];
3429                 unset($hook_data);
3430
3431                 if (!$attach) {
3432                         // Replace the blockquotes with quotes that are used in mails.
3433                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
3434                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
3435                         return $s;
3436                 }
3437
3438                 $as = '';
3439                 $vhead = false;
3440                 $matches = [];
3441                 preg_match_all('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\"(?: title=\"(.*?)\")?|', $item['attach'], $matches, PREG_SET_ORDER);
3442                 foreach ($matches as $mtch) {
3443                         $mime = $mtch[3];
3444
3445                         $the_url = Contact::magicLinkById($item['author-id'], $mtch[1]);
3446
3447                         if (strpos($mime, 'video') !== false) {
3448                                 if (!$vhead) {
3449                                         $vhead = true;
3450                                         DI::page()['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
3451                                 }
3452
3453                                 $url_parts = explode('/', $the_url);
3454                                 $id = end($url_parts);
3455                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
3456                                         '$video' => [
3457                                                 'id'     => $id,
3458                                                 'title'  => DI::l10n()->t('View Video'),
3459                                                 'src'    => $the_url,
3460                                                 'mime'   => $mime,
3461                                         ],
3462                                 ]);
3463                         }
3464
3465                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
3466                         if ($filetype) {
3467                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
3468                                 $filesubtype = str_replace('.', '-', $filesubtype);
3469                         } else {
3470                                 $filetype = 'unkn';
3471                                 $filesubtype = 'unkn';
3472                         }
3473
3474                         $title = Strings::escapeHtml(trim(($mtch[4] ?? '') ?: $mtch[1]));
3475                         $title .= ' ' . $mtch[2] . ' ' . DI::l10n()->t('bytes');
3476
3477                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
3478                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
3479                 }
3480
3481                 if ($as != '') {
3482                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
3483                 }
3484
3485                 // Map.
3486                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
3487                         $x = Map::byCoordinates(trim($item['coord']));
3488                         if ($x) {
3489                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
3490                         }
3491                 }
3492
3493                 // Replace friendica image url size with theme preference.
3494                 if (!empty($a->theme_info['item_image_size'])) {
3495                         $ps = $a->theme_info['item_image_size'];
3496                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
3497                 }
3498
3499                 $s = HTML::applyContentFilter($s, $filter_reasons);
3500
3501                 $hook_data = ['item' => $item, 'html' => $s];
3502                 Hook::callAll('prepare_body_final', $hook_data);
3503
3504                 return $hook_data['html'];
3505         }
3506
3507         /**
3508          * get private link for item
3509          *
3510          * @param array $item
3511          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
3512          * @throws \Exception
3513          */
3514         public static function getPlink($item)
3515         {
3516                 if (local_user()) {
3517                         $ret = [
3518                                 'href' => "display/" . $item['guid'],
3519                                 'orig' => "display/" . $item['guid'],
3520                                 'title' => DI::l10n()->t('View on separate page'),
3521                                 'orig_title' => DI::l10n()->t('view on separate page'),
3522                         ];
3523
3524                         if (!empty($item['plink'])) {
3525                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
3526                                 $ret["title"] = DI::l10n()->t('link to source');
3527                         }
3528                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
3529                         $ret = [
3530                                 'href' => $item['plink'],
3531                                 'orig' => $item['plink'],
3532                                 'title' => DI::l10n()->t('link to source'),
3533                         ];
3534                 } else {
3535                         $ret = [];
3536                 }
3537
3538                 return $ret;
3539         }
3540
3541         /**
3542          * Is the given item array a post that is sent as starting post to a forum?
3543          *
3544          * @param array $item
3545          * @param array $owner
3546          *
3547          * @return boolean "true" when it is a forum post
3548          */
3549         public static function isForumPost(array $item, array $owner = [])
3550         {
3551                 if (empty($owner)) {
3552                         $owner = User::getOwnerDataById($item['uid']);
3553                         if (empty($owner)) {
3554                                 return false;
3555                         }
3556                 }
3557
3558                 if (($item['author-id'] == $item['owner-id']) ||
3559                         ($owner['id'] == $item['contact-id']) ||
3560                         ($item['uri'] != $item['parent-uri']) ||
3561                         $item['origin']) {
3562                         return false;
3563                 }
3564
3565                 return Contact::isForum($item['contact-id']);
3566         }
3567
3568         /**
3569          * Search item id for given URI or plink
3570          *
3571          * @param string $uri
3572          * @param integer $uid
3573          *
3574          * @return integer item id
3575          */
3576         public static function searchByLink($uri, $uid = 0)
3577         {
3578                 $ssl_uri = str_replace('http://', 'https://', $uri);
3579                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3580
3581                 $item = DBA::selectFirst('item', ['id'], ['uri' => $uris, 'uid' => $uid]);
3582                 if (DBA::isResult($item)) {
3583                         return $item['id'];
3584                 }
3585
3586                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3587                 if (!DBA::isResult($itemcontent)) {
3588                         return 0;
3589                 }
3590
3591                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3592                 if (!DBA::isResult($itemuri)) {
3593                         return 0;
3594                 }
3595
3596                 $item = DBA::selectFirst('item', ['id'], ['uri' => $itemuri['uri'], 'uid' => $uid]);
3597                 if (DBA::isResult($item)) {
3598                         return $item['id'];
3599                 }
3600
3601                 return 0;
3602         }
3603
3604         /**
3605          * Return the URI for a link to the post
3606          *
3607          * @param string $uri URI or link to post
3608          *
3609          * @return string URI
3610          */
3611         public static function getURIByLink(string $uri)
3612         {
3613                 $ssl_uri = str_replace('http://', 'https://', $uri);
3614                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3615
3616                 $item = DBA::selectFirst('item', ['uri'], ['uri' => $uris]);
3617                 if (DBA::isResult($item)) {
3618                         return $item['uri'];
3619                 }
3620
3621                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3622                 if (!DBA::isResult($itemcontent)) {
3623                         return '';
3624                 }
3625
3626                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3627                 if (DBA::isResult($itemuri)) {
3628                         return $itemuri['uri'];
3629                 }
3630
3631                 return '';
3632         }
3633
3634         /**
3635          * Fetches item for given URI or plink
3636          *
3637          * @param string $uri
3638          * @param integer $uid
3639          *
3640          * @return integer item id
3641          */
3642         public static function fetchByLink(string $uri, int $uid = 0)
3643         {
3644                 $item_id = self::searchByLink($uri, $uid);
3645                 if (!empty($item_id)) {
3646                         return $item_id;
3647                 }
3648
3649                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
3650                         $item_id = self::searchByLink($fetched_uri, $uid);
3651                 } else {
3652                         $item_id = Diaspora::fetchByURL($uri);
3653                 }
3654
3655                 if (!empty($item_id)) {
3656                         return $item_id;
3657                 }
3658
3659                 return 0;
3660         }
3661
3662         /**
3663          * Return share data from an item array (if the item is shared item)
3664          * We are providing the complete Item array, because at some time in the future
3665          * we hopefully will define these values not in the body anymore but in some item fields.
3666          * This function is meant to replace all similar functions in the system.
3667          *
3668          * @param array $item
3669          *
3670          * @return array with share information
3671          */
3672         public static function getShareArray($item)
3673         {
3674                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
3675                         return [];
3676                 }
3677
3678                 $attribute_string = $matches[2];
3679                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
3680                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
3681                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
3682                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
3683                         }
3684                 }
3685                 return $attributes;
3686         }
3687
3688         /**
3689          * Fetch item information for shared items from the original items and adds it.
3690          *
3691          * @param array $item
3692          *
3693          * @return array item array with data from the original item
3694          */
3695         public static function addShareDataFromOriginal(array $item)
3696         {
3697                 $shared = self::getShareArray($item);
3698                 if (empty($shared)) {
3699                         return $item;
3700                 }
3701
3702                 // Real reshares always have got a GUID.
3703                 if (empty($shared['guid'])) {
3704                         return $item;
3705                 }
3706
3707                 $uid = $item['uid'] ?? 0;
3708
3709                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
3710                 $shared_item = self::selectFirst(['title', 'body', 'attach'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
3711                 if (!DBA::isResult($shared_item)) {
3712                         if (empty($shared['link'])) {
3713                                 return $item;
3714                         }
3715
3716                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
3717                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
3718                         if (empty($id)) {
3719                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
3720                                 return $item;
3721                         }
3722
3723                         $shared_item = self::selectFirst(['title', 'body', 'attach'], ['id' => $id]);
3724                         if (!DBA::isResult($shared_item)) {
3725                                 return $item;
3726                         }
3727                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
3728                 } else {
3729                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
3730                 }
3731
3732                 if (!empty($shared_item['title'])) {
3733                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
3734                         unset($shared_item['title']);
3735                 } else {
3736                         $body = $shared_item['body'];
3737                 }
3738
3739                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
3740                 unset($shared_item['body']);
3741
3742                 return array_merge($item, $shared_item);
3743         }
3744 }