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\Model\Tag;
  33 use Friendica\Core\Worker;
  34 use Friendica\Database\DBA;
  35 use Friendica\Database\DBStructure;
  36 use Friendica\DI;
  37 use Friendica\Model\Post;
  38 use Friendica\Protocol\Activity;
  39 use Friendica\Protocol\ActivityPub;
  40 use Friendica\Protocol\Diaspora;
  41 use Friendica\Util\DateTimeFormat;
  42 use Friendica\Util\Map;
  43 use Friendica\Util\Network;
  44 use Friendica\Util\Strings;
  45 use Friendica\Worker\Delivery;
  46 use LanguageDetection\Language;
  47
  48 class Item
  49 {
  50         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  51         const PT_ARTICLE = 0;
  52         const PT_NOTE = 1;
  53         const PT_PAGE = 2;
  54         const PT_IMAGE = 16;
  55         const PT_AUDIO = 17;
  56         const PT_VIDEO = 18;
  57         const PT_DOCUMENT = 19;
  58         const PT_EVENT = 32;
  59         const PT_TAG = 64;
  60         const PT_TO = 65;
  61         const PT_CC = 66;
  62         const PT_BTO = 67;
  63         const PT_BCC = 68;
  64         const PT_FOLLOWER = 69;
  65         const PT_ANNOUNCEMENT = 70;
  66         const PT_COMMENT = 71;
  67         const PT_STORED = 72;
  68         const PT_GLOBAL = 73;
  69         const PT_RELAY = 74;
  70         const PT_FETCHED = 75;
  71         const PT_PERSONAL_NOTE = 128;
  72
  73         // Field list that is used to display the items
  74         const DISPLAY_FIELDLIST = [
  75                 'uid', 'id', 'parent', 'guid', 'network', 'gravity',
  76                 'uri-id', 'uri', 'thr-parent-id', 'thr-parent', 'parent-uri-id', 'parent-uri',
  77                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  78                 'wall', 'private', 'starred', 'origin', 'title', 'body', 'language',
  79                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  80                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  81                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  82                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
  83                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type',
  84                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  85                 'writable', 'self', 'cid', 'alias',
  86                 'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  87                 'event-summary', 'event-desc', 'event-location', 'event-type',
  88                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  89                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  90         ];
  91
  92         // Field list that is used to deliver items via the protocols
  93         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  94                         'parent-guid', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  95                         'private', 'title', 'body', 'location', 'coord', 'app',
  96                         'deleted', 'extid', 'post-type', 'gravity',
  97                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  98                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  99                         'signed_text', 'network'];
 100
 101         // All fields in the item table
 102         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 103                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 104                         'contact-id', 'type', 'wall', 'gravity', 'extid', 'psid',
 105                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 106                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 107                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
 108                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 109                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 110                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 111                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 112                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 113                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 114
 115         // Item fiels that still are in use
 116         const USED_FIELDLIST = ['id', 'parent', 'guid', 'uri', 'uri-id', 'parent-uri', 'parent-uri-id',
 117                 'thr-parent', 'thr-parent-id', 'created', 'edited', 'commented', 'received', 'changed',
 118                 'gravity', 'network', 'owner-id', 'author-id', 'causer-id', 'vid', 'extid', 'post-type',
 119                 'global', 'private', 'visible', 'moderated', 'deleted', 'uid', 'contact-id',
 120                 'wall', 'origin', 'pubmail', 'starred', 'unseen', 'mention', 'forum_mode', 'psid',
 121                 'event-id', 'type', 'bookmark'];
 122
 123         // Legacy item fields that aren't stored any more in the item table
 124         const LEGACY_FIELDLIST = ['uri-hash', 'iaid', 'icid', 'attach',
 125                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'postopts',
 126                 'resource-id', 'inform', 'file', 'location', 'coord', 'tag', 'plink',
 127                 'title', 'content-warning', 'body', 'app', 'verb', 'object-type', 'object',
 128                 'target-type', 'target', 'author-name', 'author-link', 'author-avatar',
 129                 'owner-name', 'owner-link', 'owner-avatar', 'rendered-hash', 'rendered-html'];
 130
 131         // List of all verbs that don't need additional content data.
 132         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 133         const ACTIVITIES = [
 134                 Activity::LIKE, Activity::DISLIKE,
 135                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 136                 Activity::FOLLOW,
 137                 Activity::ANNOUNCE];
 138
 139         const PUBLIC = 0;
 140         const PRIVATE = 1;
 141         const UNLISTED = 2;
 142
 143         /**
 144          * Update existing item entries
 145          *
 146          * @param array $fields    The fields that are to be changed
 147          * @param array $condition The condition for finding the item entries
 148          *
 149          * In the future we may have to change permissions as well.
 150          * Then we had to add the user id as third parameter.
 151          *
 152          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 153          *
 154          * @return integer|boolean number of affected rows - or "false" if there was an error
 155          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 156          */
 157         public static function update(array $fields, array $condition)
 158         {
 159                 if (empty($condition) || empty($fields)) {
 160                         return false;
 161                 }
 162
 163                 if (!empty($fields['verb'])) {
 164                         $fields['vid'] = Verb::getID($fields['verb']);
 165                 }
 166
 167                 $rows = Post::update($fields, $condition);
 168                 if (is_bool($rows)) {
 169                         return $rows;
 170                 }
 171
 172                 // We only need to call the line by line update for specific fields
 173                 if (empty($fields['body']) && empty($fields['file']) &&
 174                         empty($fields['attach']) && empty($fields['edited'])) {
 175                         return $rows;
 176                 }
 177
 178                 Logger::info('Updating per single row method', ['fields' => $fields, 'condition' => $condition]);
 179
 180                 $items = Post::select(['id', 'origin', 'uri-id', 'uid'], $condition);
 181
 182                 $notify_items = [];
 183
 184                 while ($item = DBA::fetch($items)) {
 185                         if (!empty($fields['body'])) {
 186                                 $content_fields = ['raw-body' => trim($fields['raw-body'] ?? $fields['body'])];
 187
 188                                 // Remove all media attachments from the body and store them in the post-media table
 189                                 $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 190                                 $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 191                         }
 192
 193                         if (!empty($fields['file'])) {
 194                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $fields['file']);
 195                         }
 196
 197                         if (!empty($fields['attach'])) {
 198                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 199                         }
 200
 201                         // We only need to notfiy others when it is an original entry from us.
 202                         // Only call the notifier when the item has some content relevant change.
 203                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 204                                 $notify_items[] = $item['id'];
 205                         }
 206                 }
 207
 208                 DBA::close($items);
 209
 210                 foreach ($notify_items as $notify_item) {
 211                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $notify_item);
 212                 }
 213
 214                 return $rows;
 215         }
 216
 217         /**
 218          * Delete an item and notify others about it - if it was ours
 219          *
 220          * @param array   $condition The condition for finding the item entries
 221          * @param integer $priority  Priority for the notification
 222          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 223          */
 224         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 225         {
 226                 $items = Post::select(['id'], $condition);
 227                 while ($item = Post::fetch($items)) {
 228                         self::markForDeletionById($item['id'], $priority);
 229                 }
 230                 DBA::close($items);
 231         }
 232
 233         /**
 234          * Delete an item for an user and notify others about it - if it was ours
 235          *
 236          * @param array   $condition The condition for finding the item entries
 237          * @param integer $uid       User who wants to delete this item
 238          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 239          */
 240         public static function deleteForUser($condition, $uid)
 241         {
 242                 if ($uid == 0) {
 243                         return;
 244                 }
 245
 246                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 247                 while ($item = Post::fetch($items)) {
 248                         if (in_array($item['uid'], [$uid, 0])) {
 249                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 250                         }
 251
 252                         if ($item['uid'] == $uid) {
 253                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 254                         } elseif ($item['uid'] != 0) {
 255                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
 256                         }
 257                 }
 258                 DBA::close($items);
 259         }
 260
 261         /**
 262          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 263          *
 264          * @param integer $item_id
 265          * @param integer $priority Priority for the notification
 266          *
 267          * @return boolean success
 268          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 269          */
 270         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 271         {
 272                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 273                 // locate item to be deleted
 274                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri-id', 'origin',
 275                         'deleted', 'resource-id', 'event-id',
 276                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 277                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 278                 if (!DBA::isResult($item)) {
 279                         Logger::info('Item not found.', ['id' => $item_id]);
 280                         return false;
 281                 }
 282
 283                 if ($item['deleted']) {
 284                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 285                         return false;
 286                 }
 287
 288                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 289                 if (!DBA::isResult($parent)) {
 290                         $parent = ['origin' => false];
 291                 }
 292
 293                 // clean up categories and tags so they don't end up as orphans
 294                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 295
 296                 /*
 297                  * If item is a link to a photo resource, nuke all the associated photos
 298                  * (visitors will not have photo resources)
 299                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 300                  * generate a resource-id and therefore aren't intimately linked to the item.
 301                  */
 302                 /// @TODO: this should first check if photo is used elsewhere
 303                 if (strlen($item['resource-id'])) {
 304                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 305                 }
 306
 307                 // If item is a link to an event, delete the event.
 308                 if (intval($item['event-id'])) {
 309                         Event::delete($item['event-id']);
 310                 }
 311
 312                 // If item has attachments, drop them
 313                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 314                 foreach($attachments as $attachment) {
 315                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 316                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 317                         }
 318                 }
 319
 320                 // Set the item to "deleted"
 321                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 322                 Post::update($item_fields, ['id' => $item['id']]);
 323
 324                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 325                 self::deleteThread($item['id'], $item['parent-uri-id']);
 326
 327                 if (!Post::exists(["`uri-id` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri-id']])) {
 328                         self::markForDeletion(['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false], $priority);
 329                 }
 330
 331                 Post\DeliveryData::delete($item['uri-id']);
 332
 333                 // When the permission set will be used in photo and events as well,
 334                 // this query here needs to be extended.
 335                 // @todo Currently deactivated. We need the permission set in the deletion process.
 336                 // This is a reminder to add the removal somewhere else.
 337                 //if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
 338                 //      DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
 339                 //}
 340
 341                 // If it's the parent of a comment thread, kill all the kids
 342                 if ($item['gravity'] == GRAVITY_PARENT) {
 343                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 344                 }
 345
 346                 // Is it our comment and/or our thread?
 347                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 348                         // When we delete the original post we will delete all existing copies on the server as well
 349                         self::markForDeletion(['uri-id' => $item['uri-id'], 'deleted' => false], $priority);
 350
 351                         // send the notification upstream/downstream
 352                         if ($priority) {
 353                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, intval($item['id']));
 354                         }
 355                 } elseif ($item['uid'] != 0) {
 356                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 357                 }
 358
 359                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 360
 361                 return true;
 362         }
 363
 364         private static function guid($item, $notify)
 365         {
 366                 if (!empty($item['guid'])) {
 367                         return Strings::escapeTags(trim($item['guid']));
 368                 }
 369
 370                 if ($notify) {
 371                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 372                         // We add the hash of our own host because our host is the original creator of the post.
 373                         $prefix_host = DI::baseUrl()->getHostname();
 374                 } else {
 375                         $prefix_host = '';
 376
 377                         // We are only storing the post so we create a GUID from the original hostname.
 378                         if (!empty($item['author-link'])) {
 379                                 $parsed = parse_url($item['author-link']);
 380                                 if (!empty($parsed['host'])) {
 381                                         $prefix_host = $parsed['host'];
 382                                 }
 383                         }
 384
 385                         if (empty($prefix_host) && !empty($item['plink'])) {
 386                                 $parsed = parse_url($item['plink']);
 387                                 if (!empty($parsed['host'])) {
 388                                         $prefix_host = $parsed['host'];
 389                                 }
 390                         }
 391
 392                         if (empty($prefix_host) && !empty($item['uri'])) {
 393                                 $parsed = parse_url($item['uri']);
 394                                 if (!empty($parsed['host'])) {
 395                                         $prefix_host = $parsed['host'];
 396                                 }
 397                         }
 398
 399                         // Is it in the format data@host.tld? - Used for mail contacts
 400                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 401                                 $mailparts = explode('@', $item['author-link']);
 402                                 $prefix_host = array_pop($mailparts);
 403                         }
 404                 }
 405
 406                 if (!empty($item['plink'])) {
 407                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 408                 } elseif (!empty($item['uri'])) {
 409                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 410                 } else {
 411                         $guid = System::createUUID(hash('crc32', $prefix_host));
 412                 }
 413
 414                 return $guid;
 415         }
 416
 417         private static function contactId($item)
 418         {
 419                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 420                         return $item['contact-id'];
 421                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 422                         return $item['contact-id'];
 423                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 424                         return $item['author-id'];
 425                 } elseif (!empty($item['contact-id'])) {
 426                         return $item['contact-id'];
 427                 } else {
 428                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 429                         if (!empty($contact_id)) {
 430                                 return $contact_id;
 431                         }
 432                 }
 433                 return $item['author-id'];
 434         }
 435
 436         /**
 437          * Write an item array into a spool file to be inserted later.
 438          * This command is called whenever there are issues storing an item.
 439          *
 440          * @param array $item The item fields that are to be inserted
 441          * @throws \Exception
 442          */
 443         private static function spool($orig_item)
 444         {
 445                 // Now we store the data in the spool directory
 446                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 447                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 448
 449                 $spoolpath = get_spoolpath();
 450                 if ($spoolpath != "") {
 451                         $spool = $spoolpath . '/' . $file;
 452
 453                         file_put_contents($spool, json_encode($orig_item));
 454                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 455                 }
 456         }
 457
 458         /**
 459          * Check if the item array is a duplicate
 460          *
 461          * @param array $item
 462          * @return boolean is it a duplicate?
 463          */
 464         private static function isDuplicate(array $item)
 465         {
 466                 // Checking if there is already an item with the same guid
 467                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 468                 if (Post::exists($condition)) {
 469                         Logger::notice('Found already existing item', [
 470                                 'guid' => $item['guid'],
 471                                 'uid' => $item['uid'],
 472                                 'network' => $item['network']
 473                         ]);
 474                         return true;
 475                 }
 476
 477                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'],
 478                         'network' => [$item['network'], Protocol::DFRN]];
 479                 if (Post::exists($condition)) {
 480                         Logger::notice('duplicated item with the same uri found.', $item);
 481                         return true;
 482                 }
 483
 484                 // On Friendica and Diaspora the GUID is unique
 485                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 486                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 487                         if (Post::exists($condition)) {
 488                                 Logger::notice('duplicated item with the same guid found.', $item);
 489                                 return true;
 490                         }
 491                 } elseif ($item['network'] == Protocol::OSTATUS) {
 492                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 493                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 494                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 495                         if (Post::exists($condition)) {
 496                                 Logger::notice('duplicated item with the same body found.', $item);
 497                                 return true;
 498                         }
 499                 }
 500
 501                 /*
 502                  * Check for already added items.
 503                  * There is a timing issue here that sometimes creates double postings.
 504                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 505                  */
 506                 if (($item['uid'] == 0) && Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
 507                         Logger::notice('Global item already stored.', ['uri-id' => $item['uri-id'], 'network' => $item['network']]);
 508                         return true;
 509                 }
 510
 511                 return false;
 512         }
 513
 514         /**
 515          * Check if the item array is valid
 516          *
 517          * @param array $item
 518          * @return boolean item is valid
 519          */
 520         public static function isValid(array $item)
 521         {
 522                 // When there is no content then we don't post it
 523                 if ($item['body'] . $item['title'] == '') {
 524                         Logger::notice('No body, no title.');
 525                         return false;
 526                 }
 527
 528                 if (!empty($item['uid'])) {
 529                         $owner = User::getOwnerDataById($item['uid'], false);
 530                         if (!$owner) {
 531                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 532                                 return false;
 533                         }
 534
 535                         if ($owner['account_expired'] || $owner['account_removed']) {
 536                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 537                                 return false;
 538                         }
 539                 }
 540
 541                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 542                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 543                         return false;
 544                 }
 545
 546                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 547                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 548                         return false;
 549                 }
 550
 551                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 552                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 553                         return false;
 554                 }
 555
 556                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 557                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 558                         return false;
 559                 }
 560
 561                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 562                         return false;
 563                 }
 564
 565                 if ($item['verb'] == Activity::FOLLOW) {
 566                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 567                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 568                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 569                                 return false;
 570                         }
 571
 572                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 573                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 574                         if (Post::exists($condition)) {
 575                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 576                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 577                                 return false;
 578                         }
 579                 }
 580
 581                 return true;
 582         }
 583
 584         /**
 585          * Check if the item array is too old
 586          *
 587          * @param array $item
 588          * @return boolean item is too old
 589          */
 590         public static function isTooOld(array $item)
 591         {
 592                 // check for create date and expire time
 593                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 594
 595                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 596                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 597                         $expire_interval = $user['expire'];
 598                 }
 599
 600                 if (($expire_interval > 0) && !empty($item['created'])) {
 601                         $expire_date = time() - ($expire_interval * 86400);
 602                         $created_date = strtotime($item['created']);
 603                         if ($created_date < $expire_date) {
 604                                 Logger::notice('Item created before expiration interval.', [
 605                                         'created' => date('c', $created_date),
 606                                         'expired' => date('c', $expire_date),
 607                                         '$item' => $item
 608                                 ]);
 609                                 return true;
 610                         }
 611                 }
 612
 613                 return false;
 614         }
 615
 616         /**
 617          * Return the id of the given item array if it has been stored before
 618          *
 619          * @param array $item
 620          * @return integer item id
 621          */
 622         private static function getDuplicateID(array $item)
 623         {
 624                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 625                         $condition = ["`uri-id` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 626                                 $item['uri-id'], $item['uid'],
 627                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 628                         $existing = Post::selectFirst(['id', 'network'], $condition);
 629                         if (DBA::isResult($existing)) {
 630                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 631                                 if ($item['uid'] != 0) {
 632                                         Logger::notice('Item already existed for user', [
 633                                                 'uri-id' => $item['uri-id'],
 634                                                 'uid' => $item['uid'],
 635                                                 'network' => $item['network'],
 636                                                 'existing_id' => $existing["id"],
 637                                                 'existing_network' => $existing["network"]
 638                                         ]);
 639                                 }
 640
 641                                 return $existing["id"];
 642                         }
 643                 }
 644                 return 0;
 645         }
 646
 647         /**
 648          * Fetch top-level parent data for the given item array
 649          *
 650          * @param array $item
 651          * @return array item array with parent data
 652          * @throws \Exception
 653          */
 654         private static function getTopLevelParent(array $item)
 655         {
 656                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 657                         'uri-id', 'parent-uri-id',
 658                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 659                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 660                 $condition = ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']];
 661                 $params = ['order' => ['id' => false]];
 662                 $parent = Post::selectFirst($fields, $condition, $params);
 663
 664                 if (!DBA::isResult($parent)) {
 665                         Logger::notice('item parent was not found - ignoring item', ['thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 666                         return [];
 667                 }
 668
 669                 if ($parent['uri-id'] == $parent['parent-uri-id']) {
 670                         return $parent;
 671                 }
 672
 673                 $condition = ['uri-id' => $parent['parent-uri-id'],
 674                         'parent-uri-id' => $parent['parent-uri-id'],
 675                         'uid' => $parent['uid']];
 676                 $params = ['order' => ['id' => false]];
 677                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 678                 if (!DBA::isResult($toplevel_parent)) {
 679                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri-id' => $parent['parent-uri-id'], 'uid' => $parent['uid']]);
 680                         return [];
 681                 }
 682
 683                 return $toplevel_parent;
 684         }
 685
 686         /**
 687          * Get the gravity for the given item array
 688          *
 689          * @param array $item
 690          * @return integer gravity
 691          */
 692         private static function getGravity(array $item)
 693         {
 694                 $activity = DI::activity();
 695
 696                 if (isset($item['gravity'])) {
 697                         return intval($item['gravity']);
 698                 } elseif ($item['parent-uri-id'] === $item['uri-id']) {
 699                         return GRAVITY_PARENT;
 700                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 701                         return GRAVITY_COMMENT;
 702                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 703                         return GRAVITY_ACTIVITY;
 704                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 705                         return GRAVITY_ACTIVITY;
 706                 }
 707                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 708                 return GRAVITY_UNKNOWN;   // Should not happen
 709         }
 710
 711         public static function insert($item, $notify = false, $dontcache = false)
 712         {
 713                 $orig_item = $item;
 714
 715                 $priority = PRIORITY_HIGH;
 716
 717                 // If it is a posting where users should get notifications, then define it as wall posting
 718                 if ($notify) {
 719                         $item['wall'] = 1;
 720                         $item['origin'] = 1;
 721                         $item['network'] = Protocol::DFRN;
 722                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 723                         $item['direction'] = Conversation::PUSH;
 724
 725                         if (in_array($notify, PRIORITIES)) {
 726                                 $priority = $notify;
 727                         }
 728                 } else {
 729                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 730                 }
 731
 732                 $uid = intval($item['uid']);
 733
 734                 $item['guid'] = self::guid($item, $notify);
 735                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 736
 737                 // Store URI data
 738                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 739
 740                 // Backward compatibility: parent-uri used to be the direct parent uri.
 741                 // If it is provided without a thr-parent, it probably is the old behavior.
 742                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 743                 $item['parent-uri'] = $item['thr-parent'];
 744
 745                 $item['thr-parent-id'] = $item['parent-uri-id'] = ItemURI::getIdByURI($item['thr-parent']);
 746
 747                 // Store conversation data
 748                 $item = Conversation::insert($item);
 749
 750                 /*
 751                  * Do we already have this item?
 752                  * We have to check several networks since Friendica posts could be repeated
 753                  * via OStatus (maybe Diasporsa as well)
 754                  */
 755                 $duplicate = self::getDuplicateID($item);
 756                 if ($duplicate) {
 757                         return $duplicate;
 758                 }
 759
 760                 // Additional duplicate checks
 761                 /// @todo Check why the first duplication check returns the item number and the second a 0
 762                 if (self::isDuplicate($item)) {
 763                         return 0;
 764                 }
 765
 766                 $item['wall']          = intval($item['wall'] ?? 0);
 767                 $item['extid']         = trim($item['extid'] ?? '');
 768                 $item['author-name']   = trim($item['author-name'] ?? '');
 769                 $item['author-link']   = trim($item['author-link'] ?? '');
 770                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 771                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 772                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 773                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 774                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 775                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 776                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 777                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 778                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 779                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 780                 $item['location']      = trim($item['location'] ?? '');
 781                 $item['coord']         = trim($item['coord'] ?? '');
 782                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 783                 $item['deleted']       = 0;
 784                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
 785                 $item['verb']          = trim($item['verb'] ?? '');
 786                 $item['object-type']   = trim($item['object-type'] ?? '');
 787                 $item['object']        = trim($item['object'] ?? '');
 788                 $item['target-type']   = trim($item['target-type'] ?? '');
 789                 $item['target']        = trim($item['target'] ?? '');
 790                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 791                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 792                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 793                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 794                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 795                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 796                 $item['body']          = trim($item['body'] ?? '');
 797                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 798                 $item['app']           = trim($item['app'] ?? '');
 799                 $item['origin']        = intval($item['origin'] ?? 0);
 800                 $item['postopts']      = trim($item['postopts'] ?? '');
 801                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 802                 $item['event-id']      = intval($item['event-id'] ?? 0);
 803                 $item['inform']        = trim($item['inform'] ?? '');
 804                 $item['file']          = trim($item['file'] ?? '');
 805
 806                 // Items cannot be stored before they happen ...
 807                 if ($item['created'] > DateTimeFormat::utcNow()) {
 808                         $item['created'] = DateTimeFormat::utcNow();
 809                 }
 810
 811                 // We haven't invented time travel by now.
 812                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 813                         $item['edited'] = DateTimeFormat::utcNow();
 814                 }
 815
 816                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 817
 818                 $item['gravity'] = self::getGravity($item);
 819
 820                 $item['language'] = self::getLanguage($item);
 821
 822                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 823                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 824                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 825
 826                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 827                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 828                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 829
 830                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 831                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 832                         $item['post-type'] = self::PT_FOLLOWER;
 833                 }
 834
 835                 // Ensure that there is an avatar cache
 836                 Contact::checkAvatarCache($item['author-id']);
 837                 Contact::checkAvatarCache($item['owner-id']);
 838
 839                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 840                 $item["contact-id"] = self::contactId($item);
 841
 842                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 843                         self::isTooOld($item)) {
 844                         Logger::info('Item is too old', ['item' => $item]);
 845                         return 0;
 846                 }
 847
 848                 if (!self::isValid($item)) {
 849                         return 0;
 850                 }
 851
 852                 if ($item['gravity'] !== GRAVITY_PARENT) {
 853                         $toplevel_parent = self::getTopLevelParent($item);
 854                         if (empty($toplevel_parent)) {
 855                                 return 0;
 856                         }
 857
 858                         // If the thread originated from this node, we check the permission against the thread starter
 859                         $condition = ['uri-id' => $toplevel_parent['uri-id'], 'wall' => true];
 860                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 861                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 862                                 return 0;
 863                         }
 864
 865                         $parent_id             = $toplevel_parent['id'];
 866                         $item['parent-uri']    = $toplevel_parent['uri'];
 867                         $item['parent-uri-id'] = $toplevel_parent['uri-id'];
 868                         $item['deleted']       = $toplevel_parent['deleted'];
 869                         $item['allow_cid']     = $toplevel_parent['allow_cid'];
 870                         $item['allow_gid']     = $toplevel_parent['allow_gid'];
 871                         $item['deny_cid']      = $toplevel_parent['deny_cid'];
 872                         $item['deny_gid']      = $toplevel_parent['deny_gid'];
 873                         $parent_origin         = $toplevel_parent['origin'];
 874
 875                         // Don't federate received participation messages
 876                         if ($item['verb'] != Activity::FOLLOW) {
 877                                 $item['wall'] = $toplevel_parent['wall'];
 878                         } else {
 879                                 $item['wall'] = false;
 880                         }
 881
 882                         /*
 883                          * If the parent is private, force privacy for the entire conversation
 884                          * This differs from the above settings as it subtly allows comments from
 885                          * email correspondents to be private even if the overall thread is not.
 886                          */
 887                         if ($toplevel_parent['private']) {
 888                                 $item['private'] = $toplevel_parent['private'];
 889                         }
 890
 891                         /*
 892                          * Edge case. We host a public forum that was originally posted to privately.
 893                          * The original author commented, but as this is a comment, the permissions
 894                          * weren't fixed up so it will still show the comment as private unless we fix it here.
 895                          */
 896                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
 897                                 $item['private'] = self::PUBLIC;
 898                         }
 899
 900                         // If its a post that originated here then tag the thread as "mention"
 901                         if ($item['origin'] && $item['uid']) {
 902                                 DBA::update('post-thread-user', ['mention' => true], ['uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 903                                 DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
 904                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'parent-uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 905                         }
 906
 907                         // Update the contact relations
 908                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 909                 } else {
 910                         $parent_id = 0;
 911                         $parent_origin = $item['origin'];
 912                 }
 913
 914                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
 915                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
 916
 917                 // Is this item available in the global items (with uid=0)?
 918                 if ($item["uid"] == 0) {
 919                         $item["global"] = true;
 920
 921                         // Set the global flag on all items if this was a global item entry
 922                         Post::update(['global' => true], ['uri-id' => $item['uri-id']]);
 923                 } else {
 924                         $item['global'] = Post::exists(['uid' => 0, 'uri-id' => $item['uri-id']]);
 925                 }
 926
 927                 // ACL settings
 928                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
 929                         $item["private"] = self::PRIVATE;
 930                 }
 931
 932                 if ($notify) {
 933                         $item['edit'] = false;
 934                         $item['parent'] = $parent_id;
 935                         Hook::callAll('post_local', $item);
 936                 } else {
 937                         Hook::callAll('post_remote', $item);
 938                 }
 939
 940                 if (!empty($item['cancel'])) {
 941                         Logger::log('post cancelled by addon.');
 942                         return 0;
 943                 }
 944
 945                 if (empty($item['vid']) && !empty($item['verb'])) {
 946                         $item['vid'] = Verb::getID($item['verb']);
 947                 }
 948
 949                 // Creates or assigns the permission set
 950                 $item['psid'] = PermissionSet::getIdFromACL(
 951                         $item['uid'],
 952                         $item['allow_cid'],
 953                         $item['allow_gid'],
 954                         $item['deny_cid'],
 955                         $item['deny_gid']
 956                 );
 957
 958                 if ($item['verb'] == Activity::ANNOUNCE) {
 959                         self::setOwnerforResharedItem($item);
 960                 }
 961
 962                 // Remove all media attachments from the body and store them in the post-media table
 963                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
 964                 $item['raw-body'] = self::setHashtags($item['raw-body']);
 965
 966                 // Check for hashtags in the body and repair or add hashtag links
 967                 $item['body'] = self::setHashtags($item['body']);
 968
 969                 // Fill the cache field
 970                 self::putInCache($item);
 971
 972                 if (stristr($item['verb'], Activity::POKE)) {
 973                         $notify_type = Delivery::POKE;
 974                 } else {
 975                         $notify_type = Delivery::POST;
 976                 }
 977
 978                 // Filling item related side tables
 979                 if (!empty($item['attach'])) {
 980                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
 981                 }
 982
 983                 if ($item['gravity'] == GRAVITY_PARENT) {
 984                         Post\Thread::insert($item['uri-id'], $item);
 985                 }
 986
 987                 if (!in_array($item['verb'], self::ACTIVITIES)) {
 988                         Post\Content::insert($item['uri-id'], $item);
 989                 }
 990
 991                 // Diaspora signature
 992                 if (!empty($item['diaspora_signed_text'])) {
 993                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
 994                 }
 995
 996                 // Attached file links
 997                 if (!empty($item['file'])) {
 998                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
 999                 }
1000
1001                 // Delivery relevant data
1002                 $delivery_data = Post\DeliveryData::extractFields($item);
1003
1004                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1005                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1006                 }
1007
1008                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1009                 if (!Tag::existsForPost($item['uri-id'])) {
1010                         Tag::storeFromBody($item['uri-id'], $item['body']);
1011                 }
1012
1013                 $id = Post\User::insert($item['uri-id'], $item['uid'], $item);
1014                 if (!$id) {
1015                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1016                         return 0;
1017                 }
1018
1019                 if ($item['gravity'] == GRAVITY_PARENT) {
1020                         Post\ThreadUser::insert($item['uri-id'], $item['uid'], $item);
1021                 }
1022
1023                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'network' => $item['network']];
1024                 if (Post::exists($condition)) {
1025                         Logger::notice('Item is already inserted - aborting', $condition);
1026                         return 0;
1027                 }
1028
1029                 // Remove all fields that aren't part of the item table
1030                 $table_fields = DBStructure::getFieldsForTable('item', $item);
1031
1032                 // We remove all legacy fields that now are stored in other tables
1033                 foreach (self::LEGACY_FIELDLIST as $field) {
1034                         unset($table_fields[$field]);
1035                 }
1036
1037                 $result = DBA::insert('item', $table_fields);
1038
1039                 // When the item was successfully stored we fetch the ID of the item.
1040                 $current_post = DBA::lastInsertId();
1041
1042                 if (empty($current_post) || !DBA::isResult($result)) {
1043                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1044                         Logger::warning('Could not store item. it will be spooled', ['result' => $result, 'id' => $current_post]);
1045                         self::spool($orig_item);
1046                         return 0;
1047                 }
1048
1049                 Logger::notice('created item', ['id' => $current_post, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1050
1051                 if (!$parent_id || ($item['gravity'] === GRAVITY_PARENT)) {
1052                         $parent_id = $current_post;
1053                 }
1054
1055                 // Set parent id
1056                 DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1057
1058                 $item['id'] = $current_post;
1059                 $item['parent'] = $parent_id;
1060
1061                 // update the commented timestamp on the parent
1062                 if (DI::config()->get('system', 'like_no_comment')) {
1063                         // Update when it is a comment
1064                         $update_commented = in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1065                 } else {
1066                         // Update when it isn't a follow or tag verb
1067                         $update_commented = !in_array($item['verb'], [Activity::FOLLOW, Activity::TAG]);
1068                 }
1069
1070                 if ($update_commented) {
1071                         Post::update(['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1072                 } else {
1073                         Post::update(['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1074                 }
1075
1076                 if ($item['gravity'] === GRAVITY_PARENT) {
1077                         self::addThread($current_post);
1078                 } else {
1079                         self::updateThread($parent_id);
1080                 }
1081
1082                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1083                 if (self::tagDeliver($item['uid'], $current_post)) {
1084                         // Get the user information for the logging
1085                         $user = User::getById($uid);
1086
1087                         Logger::notice('Item had been deleted', ['id' => $current_post, 'user' => $uid, 'account-type' => $user['account-type']]);
1088                         return 0;
1089                 }
1090
1091                 if (!$dontcache) {
1092                         $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1093                         if (DBA::isResult($posted_item)) {
1094                                 if ($notify) {
1095                                         Hook::callAll('post_local_end', $posted_item);
1096                                 } else {
1097                                         Hook::callAll('post_remote_end', $posted_item);
1098                                 }
1099                         } else {
1100                                 Logger::log('new item not found in DB, id ' . $current_post);
1101                         }
1102                 }
1103
1104                 if ($item['gravity'] === GRAVITY_PARENT) {
1105                         self::addShadow($current_post);
1106                 } else {
1107                         self::addShadowPost($current_post);
1108                 }
1109
1110                 self::updateContact($item);
1111
1112                 Post\UserNotification::setNotification($item['uri-id'], $item['uid']);
1113
1114                 check_user_notification($item['uri-id'], $item['uid']);
1115                 //check_user_notification($current_post);
1116
1117                 // Distribute items to users who subscribed to their tags
1118                 self::distributeByTags($item);
1119
1120                 // Automatically reshare the item if the "remote_self" option is selected
1121                 self::autoReshare($item);
1122
1123                 $transmit = $notify || ($item['visible'] && ($parent_origin || $item['origin']));
1124
1125                 if ($transmit) {
1126                         $transmit_item = Post::selectFirst(['verb', 'origin'], ['id' => $item['id']]);
1127                         // Don't relay participation messages
1128                         if (($transmit_item['verb'] == Activity::FOLLOW) &&
1129                                 (!$transmit_item['origin'] || ($item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1130                                 Logger::info('Participation messages will not be relayed', ['item' => $item['id'], 'uri' => $item['uri'], 'verb' => $transmit_item['verb']]);
1131                                 $transmit = false;
1132                         }
1133                 }
1134
1135                 if ($transmit) {
1136                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
1137                 }
1138
1139                 return $current_post;
1140         }
1141
1142         /**
1143          * Change the owner of a parent item if it had been shared by a forum
1144          *
1145          * (public) forum posts in the new format consist of the regular post by the author
1146          * followed by an announce message sent from the forum account.
1147          * Changing the owner helps in grouping forum posts.
1148          *
1149          * @param array $item
1150          * @return void
1151          */
1152         private static function setOwnerforResharedItem(array $item)
1153         {
1154                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-type'],
1155                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1156                 if (!DBA::isResult($parent)) {
1157                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1158                         return;
1159                 }
1160
1161                 $author = Contact::selectFirst(['url', 'contact-type'], ['id' => $item['author-id']]);
1162                 if (!DBA::isResult($author)) {
1163                         Logger::error('Author not found', ['id' => $item['author-id']]);
1164                         return;
1165                 }
1166
1167                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1168                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1169                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid']]);
1170                         return;
1171                 }
1172
1173                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1174                         if ($parent['post-type'] == self::PT_ANNOUNCEMENT) {
1175                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1176                                 return;
1177                         }
1178
1179                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1180                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1181                                 return;
1182                         }
1183                         self::update(['post-type' => self::PT_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1184                         Logger::info('Set announcement post-type', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1185                         return;
1186                 }
1187
1188                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1189                 Logger::info('Change owner of the parent', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid'], 'owner-id' => $item['author-id'], 'contact-id' => $cid]);
1190         }
1191
1192         /**
1193          * Distribute the given item to users who subscribed to their tags
1194          *
1195          * @param array $item     Processed item
1196          */
1197         private static function distributeByTags(array $item)
1198         {
1199                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1200                         return;
1201                 }
1202
1203                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1204                 foreach ($uids as $uid) {
1205                         if (Contact::isSharing($item['author-id'], $uid)) {
1206                                 $fields = [];
1207                         } else {
1208                                 $fields = ['post-type' => self::PT_TAG];
1209                         }
1210
1211                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1212                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1213                 }
1214         }
1215
1216         /**
1217          * Distributes public items to the receivers
1218          *
1219          * @param integer $itemid      Item ID that should be added
1220          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1221          * @throws \Exception
1222          */
1223         public static function distribute($itemid, $signed_text = '')
1224         {
1225                 $condition = ["`id` IN (SELECT `parent` FROM `post-view` WHERE `id` = ?)", $itemid];
1226                 $parent = Post::selectFirst(['owner-id'], $condition);
1227                 if (!DBA::isResult($parent)) {
1228                         return;
1229                 }
1230
1231                 // Only distribute public items from native networks
1232                 $condition = ['id' => $itemid, 'uid' => 0,
1233                         'network' => array_merge(Protocol::FEDERATED ,['']),
1234                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1235                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1236                 if (!DBA::isResult($item)) {
1237                         return;
1238                 }
1239
1240                 $origin = $item['origin'];
1241
1242                 $users = [];
1243
1244                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1245                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1246                 if (!DBA::isResult($owner)) {
1247                         return;
1248                 }
1249
1250                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1251                 $contacts = DBA::select('contact', ['uid'], $condition);
1252                 while ($contact = DBA::fetch($contacts)) {
1253                         if ($contact['uid'] == 0) {
1254                                 continue;
1255                         }
1256
1257                         $users[$contact['uid']] = $contact['uid'];
1258                 }
1259                 DBA::close($contacts);
1260
1261                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1262                 $contacts = DBA::select('contact', ['uid'], $condition);
1263                 while ($contact = DBA::fetch($contacts)) {
1264                         if ($contact['uid'] == 0) {
1265                                 continue;
1266                         }
1267
1268                         $users[$contact['uid']] = $contact['uid'];
1269                 }
1270                 DBA::close($contacts);
1271
1272                 if (!empty($owner['alias'])) {
1273                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1274                         $contacts = DBA::select('contact', ['uid'], $condition);
1275                         while ($contact = DBA::fetch($contacts)) {
1276                                 if ($contact['uid'] == 0) {
1277                                         continue;
1278                                 }
1279
1280                                 $users[$contact['uid']] = $contact['uid'];
1281                         }
1282                         DBA::close($contacts);
1283                 }
1284
1285                 $origin_uid = 0;
1286
1287                 if ($item['uri-id'] != $item['parent-uri-id']) {
1288                         $parents = Post::select(['uid', 'origin'], ["`uri-id` = ? AND `uid` != 0", $item['parent-uri-id']]);
1289                         while ($parent = Post::fetch($parents)) {
1290                                 $users[$parent['uid']] = $parent['uid'];
1291                                 if ($parent['origin'] && !$origin) {
1292                                         $origin_uid = $parent['uid'];
1293                                 }
1294                         }
1295                         DBA::close($parents);
1296                 }
1297
1298                 foreach ($users as $uid) {
1299                         if ($origin_uid == $uid) {
1300                                 $item['diaspora_signed_text'] = $signed_text;
1301                         }
1302                         self::storeForUser($item, $uid);
1303                 }
1304         }
1305
1306         /**
1307          * Store a public item defined by their URI-ID for the given users
1308          *
1309          * @param integer $uri_id URI-ID of the given item
1310          * @param integer $uid    The user that will receive the item entry
1311          * @param array   $fields Additional fields to be stored
1312          * @return integer stored item id
1313          */
1314         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1315         {
1316                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1317                 if (!DBA::isResult($item)) {
1318                         return 0;
1319                 }
1320
1321                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1322                         Logger::notice('Item is private or not from a federated network. It will not be stored for the user.', ['uri-id' => $uri_id, 'uid' => $uid, 'private' => $item['private'], 'network' => $item['network']]);
1323                         return 0;
1324                 }
1325
1326                 $item['post-type'] = self::PT_STORED;
1327
1328                 $item = array_merge($item, $fields);
1329
1330                 $stored = self::storeForUser($item, $uid);
1331                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1332                 return $stored;
1333         }
1334
1335         /**
1336          * Store a public item array for the given users
1337          *
1338          * @param array   $item   The item entry that will be stored
1339          * @param integer $uid    The user that will receive the item entry
1340          * @return integer stored item id
1341          * @throws \Exception
1342          */
1343         private static function storeForUser(array $item, int $uid)
1344         {
1345                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1346                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1347                         return 0;
1348                 }
1349
1350                 unset($item['id']);
1351                 unset($item['parent']);
1352                 unset($item['mention']);
1353                 unset($item['starred']);
1354                 unset($item['unseen']);
1355                 unset($item['psid']);
1356
1357                 $item['uid'] = $uid;
1358                 $item['origin'] = 0;
1359                 $item['wall'] = 0;
1360
1361                 if ($item['gravity'] == GRAVITY_PARENT) {
1362                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1363                 } else {
1364                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1365                 }
1366
1367                 if (!empty($contact['id'])) {
1368                         $item['contact-id'] = $contact['id'];
1369                 } else {
1370                         // Shouldn't happen at all
1371                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1372                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1373                         if (!DBA::isResult($self)) {
1374                                 // Shouldn't happen even less
1375                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1376                                 return 0;
1377                         }
1378                         $item['contact-id'] = $self['id'];
1379                 }
1380
1381                 /// @todo Handling of "event-id"
1382
1383                 $notify = false;
1384                 if ($item['gravity'] == GRAVITY_PARENT) {
1385                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1386                         if (DBA::isResult($contact)) {
1387                                 $notify = self::isRemoteSelf($contact, $item);
1388                         }
1389                 }
1390
1391                 $distributed = self::insert($item, $notify, true);
1392
1393                 if (!$distributed) {
1394                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1395                 } else {
1396                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1397                 }
1398                 return $distributed;
1399         }
1400
1401         /**
1402          * Add a shadow entry for a given item id that is a thread starter
1403          *
1404          * We store every public item entry additionally with the user id "0".
1405          * This is used for the community page and for the search.
1406          * It is planned that in the future we will store public item entries only once.
1407          *
1408          * @param integer $itemid Item ID that should be added
1409          * @throws \Exception
1410          */
1411         private static function addShadow($itemid)
1412         {
1413                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri-id'];
1414                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1415                 $item = Post::selectFirst($fields, $condition);
1416
1417                 if (!DBA::isResult($item)) {
1418                         return;
1419                 }
1420
1421                 // is it already a copy?
1422                 if (($itemid == 0) || ($item['uid'] == 0)) {
1423                         return;
1424                 }
1425
1426                 // Is it a visible public post?
1427                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || ($item["private"] == self::PRIVATE)) {
1428                         return;
1429                 }
1430
1431                 // is it an entry from a connector? Only add an entry for natively connected networks
1432                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1433                         return;
1434                 }
1435
1436                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1437                         return;
1438                 }
1439
1440                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1441
1442                 if (DBA::isResult($item)) {
1443                         // Preparing public shadow (removing user specific data)
1444                         $item['uid'] = 0;
1445                         unset($item['id']);
1446                         unset($item['parent']);
1447                         unset($item['wall']);
1448                         unset($item['mention']);
1449                         unset($item['origin']);
1450                         unset($item['starred']);
1451                         unset($item['postopts']);
1452                         unset($item['inform']);
1453                         unset($item['post-type']);
1454                         if ($item['uri-id'] == $item['parent-uri-id']) {
1455                                 $item['contact-id'] = $item['owner-id'];
1456                         } else {
1457                                 $item['contact-id'] = $item['author-id'];
1458                         }
1459
1460                         $public_shadow = self::insert($item, false, true);
1461
1462                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1463                 }
1464         }
1465
1466         /**
1467          * Add a shadow entry for a given item id that is a comment
1468          *
1469          * This function does the same like the function above - but for comments
1470          *
1471          * @param integer $itemid Item ID that should be added
1472          * @throws \Exception
1473          */
1474         private static function addShadowPost($itemid)
1475         {
1476                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1477                 if (!DBA::isResult($item)) {
1478                         return;
1479                 }
1480
1481                 // Is it a toplevel post?
1482                 if ($item['gravity'] == GRAVITY_PARENT) {
1483                         self::addShadow($itemid);
1484                         return;
1485                 }
1486
1487                 // Is this a shadow entry?
1488                 if ($item['uid'] == 0) {
1489                         return;
1490                 }
1491
1492                 // Is there a shadow parent?
1493                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
1494                         return;
1495                 }
1496
1497                 // Is there already a shadow entry?
1498                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1499                         return;
1500                 }
1501
1502                 // Save "origin" and "parent" state
1503                 $origin = $item['origin'];
1504                 $parent = $item['parent'];
1505
1506                 // Preparing public shadow (removing user specific data)
1507                 $item['uid'] = 0;
1508                 unset($item['id']);
1509                 unset($item['parent']);
1510                 unset($item['wall']);
1511                 unset($item['mention']);
1512                 unset($item['origin']);
1513                 unset($item['starred']);
1514                 unset($item['postopts']);
1515                 unset($item['inform']);
1516                 unset($item['post-type']);
1517                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1518
1519                 $public_shadow = self::insert($item, false, true);
1520
1521                 Logger::info('Stored public shadow', ['uri-id' => $item['uri-id'], 'id' => $public_shadow]);
1522
1523                 // If this was a comment to a Diaspora post we don't get our comment back.
1524                 // This means that we have to distribute the comment by ourselves.
1525                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1526                         self::distribute($public_shadow);
1527                 }
1528         }
1529
1530         /**
1531          * Adds a language specification in a "language" element of given $arr.
1532          * Expects "body" element to exist in $arr.
1533          *
1534          * @param array $item
1535          * @return string detected language
1536          * @throws \Text_LanguageDetect_Exception
1537          */
1538         private static function getLanguage(array $item)
1539         {
1540                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1541                         return '';
1542                 }
1543
1544                 // Convert attachments to links
1545                 $naked_body = BBCode::removeAttachment($item['body']);
1546                 if (empty($naked_body)) {
1547                         return '';
1548                 }
1549
1550                 // Remove links and pictures
1551                 $naked_body = BBCode::removeLinks($naked_body);
1552
1553                 // Convert the title and the body to plain text
1554                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1555
1556                 // Remove possibly remaining links
1557                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1558
1559                 if (empty($naked_body)) {
1560                         return '';
1561                 }
1562
1563                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1564                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1565                 if (is_array($languages)) {
1566                         return json_encode($languages);
1567                 }
1568
1569                 return '';
1570         }
1571
1572         public static function getLanguageMessage(array $item)
1573         {
1574                 $iso639 = new \Matriphe\ISO639\ISO639;
1575
1576                 $used_languages = '';
1577                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1578                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1579                 }
1580                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1581                 return $used_languages;
1582         }
1583
1584         /**
1585          * Creates an unique guid out of a given uri
1586          *
1587          * @param string $uri uri of an item entry
1588          * @param string $host hostname for the GUID prefix
1589          * @return string unique guid
1590          */
1591         public static function guidFromUri($uri, $host)
1592         {
1593                 // Our regular guid routine is using this kind of prefix as well
1594                 // We have to avoid that different routines could accidentally create the same value
1595                 $parsed = parse_url($uri);
1596
1597                 // We use a hash of the hostname as prefix for the guid
1598                 $guid_prefix = hash("crc32", $host);
1599
1600                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1601                 unset($parsed["scheme"]);
1602
1603                 // Glue it together to be able to make a hash from it
1604                 $host_id = implode("/", $parsed);
1605
1606                 // We could use any hash algorithm since it isn't a security issue
1607                 $host_hash = hash("ripemd128", $host_id);
1608
1609                 return $guid_prefix.$host_hash;
1610         }
1611
1612         /**
1613          * generate an unique URI
1614          *
1615          * @param integer $uid  User id
1616          * @param string  $guid An existing GUID (Otherwise it will be generated)
1617          *
1618          * @return string
1619          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1620          */
1621         public static function newURI($uid, $guid = "")
1622         {
1623                 if ($guid == "") {
1624                         $guid = System::createUUID();
1625                 }
1626
1627                 return DI::baseUrl()->get() . '/objects/' . $guid;
1628         }
1629
1630         /**
1631          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1632          *
1633          * This can be used to filter for inactive contacts.
1634          * Only do this for public postings to avoid privacy problems, since poco data is public.
1635          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1636          *
1637          * @param array $arr Contains the just posted item record
1638          * @throws \Exception
1639          */
1640         private static function updateContact($arr)
1641         {
1642                 // Unarchive the author
1643                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1644                 if (DBA::isResult($contact)) {
1645                         Contact::unmarkForArchival($contact);
1646                 }
1647
1648                 // Unarchive the contact if it's not our own contact
1649                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1650                 if (DBA::isResult($contact)) {
1651                         Contact::unmarkForArchival($contact);
1652                 }
1653
1654                 /// @todo On private posts we could obfuscate the date
1655                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1656
1657                 // Is it a forum? Then we don't care about the rules from above
1658                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri-id"] === $arr["uri-id"])) {
1659                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1660                                 $update = true;
1661                         }
1662                 }
1663
1664                 if ($update) {
1665                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1666                         // So we have to ensure to only update the last item when it had been our own post,
1667                         // or it had been done by a "regular" contact.
1668                         if (!empty($arr['wall'])) {
1669                                 $condition = ['id' => $arr['contact-id']];
1670                         } else {
1671                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1672                         }
1673                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1674                 }
1675                 // Now do the same for the system wide contacts with uid=0
1676                 if ($arr['private'] != self::PRIVATE) {
1677                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1678                                 ['id' => $arr['owner-id']]);
1679
1680                         if ($arr['owner-id'] != $arr['author-id']) {
1681                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1682                                         ['id' => $arr['author-id']]);
1683                         }
1684                 }
1685         }
1686
1687         public static function setHashtags($body)
1688         {
1689                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1690                         $tags = BBCode::getTags($body);
1691
1692                         // No hashtags?
1693                         if (!count($tags)) {
1694                                 return $body;
1695                         }
1696
1697                         // This sorting is important when there are hashtags that are part of other hashtags
1698                         // Otherwise there could be problems with hashtags like #test and #test2
1699                         // Because of this we are sorting from the longest to the shortest tag.
1700                         usort($tags, function ($a, $b) {
1701                                 return strlen($b) <=> strlen($a);
1702                         });
1703
1704                         $URLSearchString = "^\[\]";
1705
1706                         // All hashtags should point to the home server if "local_tags" is activated
1707                         if (DI::config()->get('system', 'local_tags')) {
1708                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1709                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1710                         }
1711
1712                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1713                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1714                                 function ($match) {
1715                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1716                                 }, $body);
1717
1718                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1719                                 function ($match) {
1720                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1721                                 }, $body);
1722
1723                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1724                                 function ($match) {
1725                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1726                                 }, $body);
1727
1728                         // Repair recursive urls
1729                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1730                                 "&num;$2", $body);
1731
1732                         foreach ($tags as $tag) {
1733                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1734                                         continue;
1735                                 }
1736
1737                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1738                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1739
1740                                 $body = str_replace($tag, $newtag, $body);
1741                         }
1742
1743                         // Convert back the masked hashtags
1744                         $body = str_replace("&num;", "#", $body);
1745
1746                         return $body;
1747                 });
1748
1749                 return $body;
1750         }
1751
1752         /**
1753          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1754          *
1755          * @param int $uid
1756          * @param int $item_id
1757          * @return boolean true if item was deleted, else false
1758          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1759          * @throws \ImagickException
1760          */
1761         private static function tagDeliver($uid, $item_id)
1762         {
1763                 $mention = false;
1764
1765                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1766                 if (!DBA::isResult($user)) {
1767                         return false;
1768                 }
1769
1770                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1771                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1772
1773                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1774                 if (!DBA::isResult($item)) {
1775                         return false;
1776                 }
1777
1778                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1779
1780                 /*
1781                  * Diaspora uses their own hardwired link URL in @-tags
1782                  * instead of the one we supply with webfinger
1783                  */
1784                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
1785
1786                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1787                 if ($cnt) {
1788                         foreach ($matches as $mtch) {
1789                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
1790                                         $mention = true;
1791                                         Logger::log('mention found: ' . $mtch[2]);
1792                                 }
1793                         }
1794                 }
1795
1796                 if (!$mention) {
1797                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1798                         foreach ($tags as $tag) {
1799                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
1800                                         $mention = true;
1801                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
1802                                 }
1803                         }
1804                 }
1805
1806                 if (!$mention) {
1807                         if (($community_page || $prvgroup) &&
1808                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
1809                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item_id, 'guid'=> $item['guid']]);
1810                                 DBA::delete('item', ['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1811                                 Post\User::delete(['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1812                                 return true;
1813                         }
1814                         return false;
1815                 }
1816
1817                 $arr = ['item' => $item, 'user' => $user];
1818
1819                 Hook::callAll('tagged', $arr);
1820
1821                 if (!$community_page && !$prvgroup) {
1822                         return false;
1823                 }
1824
1825                 /*
1826                  * tgroup delivery - setup a second delivery chain
1827                  * prevent delivery looping - only proceed
1828                  * if the message originated elsewhere and is a top-level post
1829                  */
1830                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
1831                         return false;
1832                 }
1833
1834                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
1835                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
1836                 if (!DBA::isResult($self)) {
1837                         return false;
1838                 }
1839
1840                 $owner_id = Contact::getIdForURL($self['url']);
1841
1842                 // also reset all the privacy bits to the forum default permissions
1843
1844                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
1845
1846                 $psid = PermissionSet::getIdFromACL(
1847                         $user['uid'],
1848                         $user['allow_cid'],
1849                         $user['allow_gid'],
1850                         $user['deny_cid'],
1851                         $user['deny_gid']
1852                 );
1853
1854                 $forum_mode = ($prvgroup ? 2 : 1);
1855
1856                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
1857                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
1858                 self::update($fields, ['id' => $item_id]);
1859
1860                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, $item_id);
1861
1862                 self::performActivity($item_id, 'announce', $uid);
1863
1864                 return false;
1865         }
1866
1867         /**
1868          * Automatically reshare the item if the "remote_self" option is selected
1869          *
1870          * @param array $item
1871          * @return void
1872          */
1873         private static function autoReshare(array $item)
1874         {
1875                 if ($item['gravity'] != GRAVITY_PARENT) {
1876                         return;
1877                 }
1878
1879                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
1880                         return;
1881                 }
1882
1883                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1884                         return;
1885                 }
1886
1887                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
1888
1889                 self::performActivity($item['id'], 'announce', $item['uid']);
1890         }
1891
1892         public static function isRemoteSelf($contact, &$datarray)
1893         {
1894                 if (!$contact['remote_self']) {
1895                         return false;
1896                 }
1897
1898                 // Prevent the forwarding of posts that are forwarded
1899                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
1900                         Logger::info('Already forwarded');
1901                         return false;
1902                 }
1903
1904                 // Prevent to forward already forwarded posts
1905                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
1906                         Logger::info('Already forwarded (second test)');
1907                         return false;
1908                 }
1909
1910                 // Only forward posts
1911                 if ($datarray["verb"] != Activity::POST) {
1912                         Logger::info('No post');
1913                         return false;
1914                 }
1915
1916                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
1917                         Logger::info('Not public');
1918                         return false;
1919                 }
1920
1921                 $datarray2 = $datarray;
1922                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
1923                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
1924                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
1925                                         ['uid' => $contact['uid'], 'self' => true]);
1926                         if (DBA::isResult($self)) {
1927                                 $datarray['contact-id'] = $self["id"];
1928
1929                                 $datarray['owner-name'] = $self["name"];
1930                                 $datarray['owner-link'] = $self["url"];
1931                                 $datarray['owner-avatar'] = $self["thumb"];
1932
1933                                 $datarray['author-name']   = $datarray['owner-name'];
1934                                 $datarray['author-link']   = $datarray['owner-link'];
1935                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
1936
1937                                 unset($datarray['edited']);
1938
1939                                 unset($datarray['network']);
1940                                 unset($datarray['owner-id']);
1941                                 unset($datarray['author-id']);
1942                         }
1943
1944                         if ($contact['network'] != Protocol::FEED) {
1945                                 $old_uri_id = $datarray["uri-id"] ?? 0;
1946                                 $datarray["guid"] = System::createUUID();
1947                                 unset($datarray["plink"]);
1948                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
1949                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
1950                                 $datarray["extid"] = Protocol::DFRN;
1951                                 $urlpart = parse_url($datarray2['author-link']);
1952                                 $datarray["app"] = $urlpart["host"];
1953                                 if (!empty($old_uri_id)) {
1954                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
1955                                 }
1956
1957                                 unset($datarray["parent-uri"]);
1958                                 unset($datarray["thr-parent"]);
1959                         } else {
1960                                 $datarray['private'] = self::PUBLIC;
1961                         }
1962                 }
1963
1964                 if ($contact['network'] != Protocol::FEED) {
1965                         // Store the original post
1966                         $result = self::insert($datarray2);
1967                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
1968                 } else {
1969                         $datarray["app"] = "Feed";
1970                         $result = true;
1971                 }
1972
1973                 // Trigger automatic reactions for addons
1974                 $datarray['api_source'] = true;
1975
1976                 // We have to tell the hooks who we are - this really should be improved
1977                 $_SESSION['authenticated'] = true;
1978                 $_SESSION['uid'] = $contact['uid'];
1979
1980                 return (bool)$result;
1981         }
1982
1983         /**
1984          *
1985          * @param string $s
1986          * @param int    $uid
1987          * @param array  $item
1988          * @param int    $cid
1989          * @return string
1990          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1991          * @throws \ImagickException
1992          */
1993         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
1994         {
1995                 if (DI::config()->get('system', 'disable_embedded')) {
1996                         return $s;
1997                 }
1998
1999                 Logger::info('check for photos');
2000                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
2001
2002                 $orig_body = $s;
2003                 $new_body = '';
2004
2005                 $img_start = strpos($orig_body, '[img');
2006                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2007                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2008
2009                 while (($img_st_close !== false) && ($img_len !== false)) {
2010                         $img_st_close++; // make it point to AFTER the closing bracket
2011                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2012
2013                         Logger::info('found photo', ['image' => $image]);
2014
2015                         if (stristr($image, $site . '/photo/')) {
2016                                 // Only embed locally hosted photos
2017                                 $replace = false;
2018                                 $i = basename($image);
2019                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2020                                 $x = strpos($i, '-');
2021
2022                                 if ($x) {
2023                                         $res = substr($i, $x + 1);
2024                                         $i = substr($i, 0, $x);
2025                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2026                                         if (DBA::isResult($photo)) {
2027                                                 /*
2028                                                  * Check to see if we should replace this photo link with an embedded image
2029                                                  * 1. No need to do so if the photo is public
2030                                                  * 2. If there's a contact-id provided, see if they're in the access list
2031                                                  *    for the photo. If so, embed it.
2032                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2033                                                  *    permissions, regardless of order but first check to see if they're an exact
2034                                                  *    match to save some processing overhead.
2035                                                  */
2036                                                 if (self::hasPermissions($photo)) {
2037                                                         if ($cid) {
2038                                                                 $recips = self::enumeratePermissions($photo);
2039                                                                 if (in_array($cid, $recips)) {
2040                                                                         $replace = true;
2041                                                                 }
2042                                                         } elseif ($item) {
2043                                                                 if (self::samePermissions($uid, $item, $photo)) {
2044                                                                         $replace = true;
2045                                                                 }
2046                                                         }
2047                                                 }
2048                                                 if ($replace) {
2049                                                         $photo_img = Photo::getImageForPhoto($photo);
2050                                                         // If a custom width and height were specified, apply before embedding
2051                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2052                                                                 Logger::info('scaling photo');
2053
2054                                                                 $width = intval($match[1]);
2055                                                                 $height = intval($match[2]);
2056
2057                                                                 $photo_img->scaleDown(max($width, $height));
2058                                                         }
2059
2060                                                         $data = $photo_img->asString();
2061                                                         $type = $photo_img->getType();
2062
2063                                                         Logger::info('replacing photo');
2064                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2065                                                         Logger::debug('replaced', ['image' => $image]);
2066                                                 }
2067                                         }
2068                                 }
2069                         }
2070
2071                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2072                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2073                         if ($orig_body === false) {
2074                                 $orig_body = '';
2075                         }
2076
2077                         $img_start = strpos($orig_body, '[img');
2078                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2079                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2080                 }
2081
2082                 $new_body = $new_body . $orig_body;
2083
2084                 return $new_body;
2085         }
2086
2087         private static function hasPermissions($obj)
2088         {
2089                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2090                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2091         }
2092
2093         private static function samePermissions($uid, $obj1, $obj2)
2094         {
2095                 // first part is easy. Check that these are exactly the same.
2096                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2097                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2098                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2099                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2100                         return true;
2101                 }
2102
2103                 // This is harder. Parse all the permissions and compare the resulting set.
2104                 $recipients1 = self::enumeratePermissions($obj1);
2105                 $recipients2 = self::enumeratePermissions($obj2);
2106                 sort($recipients1);
2107                 sort($recipients2);
2108
2109                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2110                 return ($recipients1 == $recipients2);
2111         }
2112
2113         /**
2114          * Returns an array of contact-ids that are allowed to see this object
2115          *
2116          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2117          * @param bool  $check_dead Prunes unavailable contacts from the result
2118          * @return array
2119          * @throws \Exception
2120          */
2121         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2122         {
2123                 $aclFormater = DI::aclFormatter();
2124
2125                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2126                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2127                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2128                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2129                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2130                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2131                 $recipients   = array_diff($recipients, $deny);
2132                 return $recipients;
2133         }
2134
2135         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2136         {
2137                 if (!$uid || ($days < 1)) {
2138                         return;
2139                 }
2140
2141                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2142                         $uid, GRAVITY_PARENT];
2143
2144                 /*
2145                  * $expire_network_only = save your own wall posts
2146                  * and just expire conversations started by others
2147                  */
2148                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2149
2150                 if ($expire_network_only) {
2151                         $condition[0] .= " AND NOT `wall`";
2152                 }
2153
2154                 if ($network != "") {
2155                         $condition[0] .= " AND `network` = ?";
2156                         $condition[] = $network;
2157                 }
2158
2159                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2160                 $condition[] = $days;
2161
2162                 $items = Post::select(['resource-id', 'starred', 'type', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2163
2164                 if (!DBA::isResult($items)) {
2165                         return;
2166                 }
2167
2168                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2169
2170                 // Forcing expiring of items - but not notes and marked items
2171                 if ($force) {
2172                         $expire_items = true;
2173                 }
2174
2175                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2176                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2177                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2178
2179                 $expired = 0;
2180
2181                 $priority = DI::config()->get('system', 'expire-notify-priority');
2182
2183                 while ($item = Post::fetch($items)) {
2184                         // don't expire filed items
2185                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2186                                 continue;
2187                         }
2188
2189                         // Only expire posts, not photos and photo comments
2190
2191                         if (!$expire_photos && strlen($item['resource-id'])) {
2192                                 continue;
2193                         } elseif (!$expire_starred && intval($item['starred'])) {
2194                                 continue;
2195                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == self::PT_PERSONAL_NOTE))) {
2196                                 continue;
2197                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2198                                 continue;
2199                         }
2200
2201                         self::markForDeletionById($item['id'], $priority);
2202
2203                         ++$expired;
2204                 }
2205                 DBA::close($items);
2206                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2207         }
2208
2209         public static function firstPostDate($uid, $wall = false)
2210         {
2211                 $condition = ['gravity' => GRAVITY_PARENT, 'uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2212                 $params = ['order' => ['received' => false]];
2213                 $thread = Post::selectFirst(['received'], $condition, $params);
2214                 if (DBA::isResult($thread)) {
2215                         return substr(DateTimeFormat::local($thread['received']), 0, 10);
2216                 }
2217                 return false;
2218         }
2219
2220         /**
2221          * add/remove activity to an item
2222          *
2223          * Toggle activities as like,dislike,attend of an item
2224          *
2225          * @param int $item_id
2226          * @param string $verb
2227          *            Activity verb. One of
2228          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2229          *            attendno, unattendno, attendmaybe, unattendmaybe,
2230          *            announce, unannouce
2231          * @return bool
2232          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2233          * @throws \ImagickException
2234          * @hook  'post_local_end'
2235          *            array $arr
2236          *            'post_id' => ID of posted item
2237          */
2238         public static function performActivity(int $item_id, string $verb, int $uid)
2239         {
2240                 if (empty($uid)) {
2241                         return false;
2242                 }
2243
2244                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2245
2246                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2247                 if (!DBA::isResult($item)) {
2248                         Logger::log('like: unknown item ' . $item_id);
2249                         return false;
2250                 }
2251
2252                 $uri_id = $item['uri-id'];
2253
2254                 if (!in_array($item['uid'], [0, $uid])) {
2255                         return false;
2256                 }
2257
2258                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2259                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2260                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2261                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2262                                 if (!DBA::isResult($item)) {
2263                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'uri-id' => $uri_id]);
2264                                         return false;
2265                                 }
2266                         }
2267                 }
2268
2269                 // Retrieves the local post owner
2270                 $owner = User::getOwnerDataById($uid);
2271                 if (empty($owner)) {
2272                         Logger::info('Empty owner for user', ['uid' => $uid]);
2273                         return false;
2274                 }
2275
2276                 // Retrieve the current logged in user's public contact
2277                 $author_id = Contact::getIdForURL($owner['url']);
2278                 if (empty($author_id)) {
2279                         Logger::info('Empty public contact');
2280                         return false;
2281                 }
2282
2283                 $activity = null;
2284                 switch ($verb) {
2285                         case 'like':
2286                         case 'unlike':
2287                                 $activity = Activity::LIKE;
2288                                 break;
2289                         case 'dislike':
2290                         case 'undislike':
2291                                 $activity = Activity::DISLIKE;
2292                                 break;
2293                         case 'attendyes':
2294                         case 'unattendyes':
2295                                 $activity = Activity::ATTEND;
2296                                 break;
2297                         case 'attendno':
2298                         case 'unattendno':
2299                                 $activity = Activity::ATTENDNO;
2300                                 break;
2301                         case 'attendmaybe':
2302                         case 'unattendmaybe':
2303                                 $activity = Activity::ATTENDMAYBE;
2304                                 break;
2305                         case 'follow':
2306                         case 'unfollow':
2307                                 $activity = Activity::FOLLOW;
2308                                 break;
2309                         case 'announce':
2310                         case 'unannounce':
2311                                 $activity = Activity::ANNOUNCE;
2312                                 break;
2313                         default:
2314                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2315                                 return false;
2316                 }
2317
2318                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2319
2320                 // Enable activity toggling instead of on/off
2321                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2322
2323                 // Look for an existing verb row
2324                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2325                 if ($event_verb_flag) {
2326                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2327
2328                         // Translate to the index based activity index
2329                         $vids = [];
2330                         foreach ($verbs as $verb) {
2331                                 $vids[] = Verb::getID($verb);
2332                         }
2333                 } else {
2334                         $vids = Verb::getID($activity);
2335                 }
2336
2337                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2338                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent-id' => $uri_id];
2339                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2340
2341                 if (DBA::isResult($like_item)) {
2342                         /**
2343                          * Truth table for existing activities
2344                          *
2345                          * |          Inputs            ||      Outputs      |
2346                          * |----------------------------||-------------------|
2347                          * |  Mode  | Event | Same verb || Delete? | Return? |
2348                          * |--------|-------|-----------||---------|---------|
2349                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2350                          * | create |  Yes  |    No     ||   Yes   |   No    |
2351                          * | create |  No   |    Yes    ||   No    |   Yes   |
2352                          * | create |  No   |    No     ||        N/A†       |
2353                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2354                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2355                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2356                          * | delete |  No   |    No     ||        N/A†       |
2357                          * |--------|-------|-----------||---------|---------|
2358                          * |   A    |   B   |     C     || A xor C | !B or C |
2359                          *
2360                          * † Can't happen: It's impossible to find an existing non-event activity without
2361                          *                 the same verb because we are only looking for this single verb.
2362                          *
2363                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2364                          */
2365                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2366                                 self::markForDeletionById($like_item['id']);
2367                         }
2368
2369                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2370                                 return true;
2371                         }
2372                 }
2373
2374                 // No need to go further if we aren't creating anything
2375                 if ($mode == 'delete') {
2376                         return true;
2377                 }
2378
2379                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2380
2381                 $new_item = [
2382                         'guid'          => System::createUUID(),
2383                         'uri'           => self::newURI($item['uid']),
2384                         'uid'           => $item['uid'],
2385                         'contact-id'    => $owner['id'],
2386                         'wall'          => $item['wall'],
2387                         'origin'        => 1,
2388                         'network'       => Protocol::DFRN,
2389                         'protocol'      => Conversation::PARCEL_DIRECT,
2390                         'direction'     => Conversation::PUSH,
2391                         'gravity'       => GRAVITY_ACTIVITY,
2392                         'parent'        => $item['id'],
2393                         'thr-parent'    => $item['uri'],
2394                         'owner-id'      => $author_id,
2395                         'author-id'     => $author_id,
2396                         'body'          => $activity,
2397                         'verb'          => $activity,
2398                         'object-type'   => $objtype,
2399                         'allow_cid'     => $item['allow_cid'],
2400                         'allow_gid'     => $item['allow_gid'],
2401                         'deny_cid'      => $item['deny_cid'],
2402                         'deny_gid'      => $item['deny_gid'],
2403                         'visible'       => 1,
2404                         'unseen'        => 1,
2405                 ];
2406
2407                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2408                 if (!empty($signed)) {
2409                         $new_item['diaspora_signed_text'] = json_encode($signed);
2410                 }
2411
2412                 $new_item_id = self::insert($new_item);
2413
2414                 // If the parent item isn't visible then set it to visible
2415                 if (!$item['visible']) {
2416                         self::update(['visible' => true], ['id' => $item['id']]);
2417                 }
2418
2419                 $new_item['id'] = $new_item_id;
2420
2421                 Hook::callAll('post_local_end', $new_item);
2422
2423                 return true;
2424         }
2425
2426         private static function addThread($itemid, $onlyshadow = false)
2427         {
2428                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2429                         'moderated', 'visible', 'starred', 'contact-id', 'post-type', 'uri-id',
2430                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2431                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2432                 $item = Post::selectFirst($fields, $condition);
2433
2434                 if (!DBA::isResult($item)) {
2435                         return;
2436                 }
2437
2438                 $item['iid'] = $itemid;
2439
2440                 if (!$onlyshadow) {
2441                         $result = DBA::replace('thread', $item);
2442
2443                         Logger::info('Add thread', ['item' => $itemid, 'result' => $result]);
2444                 }
2445         }
2446
2447         private static function updateThread($itemid, $setmention = false)
2448         {
2449                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
2450                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id', 'uri-id',
2451                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
2452
2453                 $item = Post::selectFirst($fields, ['id' => $itemid, 'gravity' => GRAVITY_PARENT]);
2454                 if (!DBA::isResult($item)) {
2455                         return;
2456                 }
2457
2458                 if ($setmention) {
2459                         $item["mention"] = 1;
2460                 }
2461
2462                 $fields = [];
2463
2464                 foreach ($item as $field => $data) {
2465                         if (!in_array($field, ["guid"])) {
2466                                 $fields[$field] = $data;
2467                         }
2468                 }
2469
2470                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
2471
2472                 Logger::info('Update thread', ['item' => $itemid, 'guid' => $item["guid"], 'result' => $result]);
2473         }
2474
2475         private static function deleteThread($itemid, $uri_id)
2476         {
2477                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2478                 if (!DBA::isResult($item)) {
2479                         Logger::info('No thread found', ['id' => $itemid]);
2480                         return;
2481                 }
2482
2483                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
2484
2485                 Logger::info('Deleted thread', ['item' => $itemid, 'result' => $result]);
2486
2487                 $condition = ["`uri-id` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $uri_id, $item["uid"]];
2488                 if (!Post::exists($condition)) {
2489                         DBA::delete('item', ['uri-id' => $uri_id, 'uid' => 0]);
2490                         Post\User::delete(['uri-id' => $uri_id, 'uid' => 0]);
2491                         Logger::debug('Deleted shadow item', ['id' => $itemid, 'uri-id' => $uri_id]);
2492                 }
2493         }
2494
2495         /**
2496          * Fetch the SQL condition for the given user id
2497          *
2498          * @param integer $owner_id User ID for which the permissions should be fetched
2499          * @return array condition
2500          */
2501         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2502         {
2503                 $local_user = local_user();
2504                 $remote_user = Session::getRemoteContactID($owner_id);
2505
2506                 // default permissions - anonymous user
2507                 $condition = ["`private` != ?", self::PRIVATE];
2508
2509                 if ($local_user && ($local_user == $owner_id)) {
2510                         // Profile owner - everything is visible
2511                         $condition = [];
2512                 } elseif ($remote_user) {
2513                          // Authenticated visitor - fetch the matching permissionsets
2514                         $set = PermissionSet::get($owner_id, $remote_user);
2515                         if (!empty($set)) {
2516                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2517                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2518                                         self::PRIVATE, self::PRIVATE];
2519                                 $condition = array_merge($condition, $set);
2520                         }
2521                 }
2522
2523                 return $condition;
2524         }
2525
2526         /**
2527          * Get a permission SQL string for the given user
2528          *
2529          * @param int $owner_id
2530          * @param string $table
2531          * @return string
2532          */
2533         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2534         {
2535                 $local_user = local_user();
2536                 $remote_user = Session::getRemoteContactID($owner_id);
2537
2538                 if (!empty($table)) {
2539                         $table = DBA::quoteIdentifier($table) . '.';
2540                 }
2541
2542                 /*
2543                  * Construct permissions
2544                  *
2545                  * default permissions - anonymous user
2546                  */
2547                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2548
2549                 // Profile owner - everything is visible
2550                 if ($local_user && ($local_user == $owner_id)) {
2551                         $sql = '';
2552                 } elseif ($remote_user) {
2553                         /*
2554                          * Authenticated visitor. Unless pre-verified,
2555                          * check that the contact belongs to this $owner_id
2556                          * and load the groups the visitor belongs to.
2557                          * If pre-verified, the caller is expected to have already
2558                          * done this and passed the groups into this function.
2559                          */
2560                         $set = PermissionSet::get($owner_id, $remote_user);
2561
2562                         if (!empty($set)) {
2563                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2564                         } else {
2565                                 $sql_set = '';
2566                         }
2567
2568                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2569                 }
2570
2571                 return $sql;
2572         }
2573
2574         /**
2575          * get translated item type
2576          *
2577          * @param $item
2578          * @return string
2579          */
2580         public static function postType($item)
2581         {
2582                 if (!empty($item['event-id'])) {
2583                         return DI::l10n()->t('event');
2584                 } elseif (!empty($item['resource-id'])) {
2585                         return DI::l10n()->t('photo');
2586                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2587                         return DI::l10n()->t('activity');
2588                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2589                         return DI::l10n()->t('comment');
2590                 }
2591
2592                 return DI::l10n()->t('post');
2593         }
2594
2595         /**
2596          * Sets the "rendered-html" field of the provided item
2597          *
2598          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2599          *
2600          * @param array $item
2601          * @param bool  $update
2602          *
2603          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2604          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2605          */
2606         public static function putInCache(&$item, $update = false)
2607         {
2608                 // Save original body to prevent addons to modify it
2609                 $body = $item['body'];
2610
2611                 $rendered_hash = $item['rendered-hash'] ?? '';
2612                 $rendered_html = $item['rendered-html'] ?? '';
2613
2614                 if ($rendered_hash == ''
2615                         || $rendered_html == ''
2616                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2617                         || DI::config()->get('system', 'ignore_cache')
2618                 ) {
2619                         self::addRedirToImageTags($item);
2620
2621                         $item['rendered-html'] = BBCode::convert($item['body']);
2622                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2623
2624                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2625                         Hook::callAll('put_item_in_cache', $hook_data);
2626                         $item['rendered-html'] = $hook_data['rendered-html'];
2627                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2628                         unset($hook_data);
2629
2630                         // Force an update if the generated values differ from the existing ones
2631                         if ($rendered_hash != $item['rendered-hash']) {
2632                                 $update = true;
2633                         }
2634
2635                         // Only compare the HTML when we forcefully ignore the cache
2636                         if (DI::config()->get('system', 'ignore_cache') && ($rendered_html != $item['rendered-html'])) {
2637                                 $update = true;
2638                         }
2639
2640                         if ($update && !empty($item['id'])) {
2641                                 self::update(
2642                                         [
2643                                                 'rendered-html' => $item['rendered-html'],
2644                                                 'rendered-hash' => $item['rendered-hash']
2645                                         ],
2646                                         ['id' => $item['id']]
2647                                 );
2648                         }
2649                 }
2650
2651                 $item['body'] = $body;
2652         }
2653
2654         /**
2655          * Find any non-embedded images in private items and add redir links to them
2656          *
2657          * @param array &$item The field array of an item row
2658          */
2659         private static function addRedirToImageTags(array &$item)
2660         {
2661                 $app = DI::app();
2662
2663                 $matches = [];
2664                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2665                 if ($cnt) {
2666                         foreach ($matches as $mtch) {
2667                                 if (strpos($mtch[1], '/redir') !== false) {
2668                                         continue;
2669                                 }
2670
2671                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2672                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2673                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2674                                 }
2675                         }
2676                 }
2677         }
2678
2679         /**
2680          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2681          * If attach is true, also add icons for item attachments.
2682          *
2683          * @param array   $item
2684          * @param boolean $attach
2685          * @param boolean $is_preview
2686          * @return string item body html
2687          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2688          * @throws \ImagickException
2689          * @hook  prepare_body_init item array before any work
2690          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2691          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2692          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2693          */
2694         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2695         {
2696                 $a = DI::app();
2697                 Hook::callAll('prepare_body_init', $item);
2698
2699                 // In order to provide theme developers more possibilities, event items
2700                 // are treated differently.
2701                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2702                         $ev = Event::getItemHTML($item);
2703                         return $ev;
2704                 }
2705
2706                 $tags = Tag::populateFromItem($item);
2707
2708                 $item['tags'] = $tags['tags'];
2709                 $item['hashtags'] = $tags['hashtags'];
2710                 $item['mentions'] = $tags['mentions'];
2711
2712                 // Compile eventual content filter reasons
2713                 $filter_reasons = [];
2714                 if (!$is_preview && public_contact() != $item['author-id']) {
2715                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2716                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2717                         }
2718
2719                         $hook_data = [
2720                                 'item' => $item,
2721                                 'filter_reasons' => $filter_reasons
2722                         ];
2723                         Hook::callAll('prepare_body_content_filter', $hook_data);
2724                         $filter_reasons = $hook_data['filter_reasons'];
2725                         unset($hook_data);
2726                 }
2727
2728                 // Update the cached values if there is no "zrl=..." on the links.
2729                 $update = (!Session::isAuthenticated() && ($item["uid"] == 0));
2730
2731                 // Or update it if the current viewer is the intented viewer.
2732                 if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
2733                         $update = true;
2734                 }
2735
2736                 self::putInCache($item, $update);
2737                 $s = $item["rendered-html"];
2738
2739                 $hook_data = [
2740                         'item' => $item,
2741                         'html' => $s,
2742                         'preview' => $is_preview,
2743                         'filter_reasons' => $filter_reasons
2744                 ];
2745                 Hook::callAll('prepare_body', $hook_data);
2746                 $s = $hook_data['html'];
2747                 unset($hook_data);
2748
2749                 if (!$attach) {
2750                         // Replace the blockquotes with quotes that are used in mails.
2751                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2752                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2753                         return $s;
2754                 }
2755
2756                 $as = '';
2757                 $vhead = false;
2758                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2759                         $mime = $attachment['mimetype'];
2760
2761                         $the_url = Contact::magicLinkById($item['author-id'], $attachment['url']);
2762
2763                         if (strpos($mime, 'video') !== false) {
2764                                 if (!$vhead) {
2765                                         $vhead = true;
2766                                         DI::page()['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
2767                                 }
2768
2769                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2770                                         '$video' => [
2771                                                 'id'     => $item['author-id'],
2772                                                 'title'  => DI::l10n()->t('View Video'),
2773                                                 'src'    => $the_url,
2774                                                 'mime'   => $mime,
2775                                         ],
2776                                 ]);
2777                         }
2778
2779                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2780                         if ($filetype) {
2781                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
2782                                 $filesubtype = str_replace('.', '-', $filesubtype);
2783                         } else {
2784                                 $filetype = 'unkn';
2785                                 $filesubtype = 'unkn';
2786                         }
2787
2788                         $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
2789                         $title .= ' ' . ($attachment['size'] ?? 0) . ' ' . DI::l10n()->t('bytes');
2790
2791                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
2792                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
2793                 }
2794
2795                 if ($as != '') {
2796                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
2797                 }
2798
2799                 // Map.
2800                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2801                         $x = Map::byCoordinates(trim($item['coord']));
2802                         if ($x) {
2803                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2804                         }
2805                 }
2806
2807                 // Replace friendica image url size with theme preference.
2808                 if (!empty($a->theme_info['item_image_size'])) {
2809                         $ps = $a->theme_info['item_image_size'];
2810                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2811                 }
2812
2813                 $s = HTML::applyContentFilter($s, $filter_reasons);
2814
2815                 $hook_data = ['item' => $item, 'html' => $s];
2816                 Hook::callAll('prepare_body_final', $hook_data);
2817
2818                 return $hook_data['html'];
2819         }
2820
2821         /**
2822          * get private link for item
2823          *
2824          * @param array $item
2825          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
2826          * @throws \Exception
2827          */
2828         public static function getPlink($item)
2829         {
2830                 if (local_user()) {
2831                         $ret = [
2832                                 'href' => "display/" . $item['guid'],
2833                                 'orig' => "display/" . $item['guid'],
2834                                 'title' => DI::l10n()->t('View on separate page'),
2835                                 'orig_title' => DI::l10n()->t('view on separate page'),
2836                         ];
2837
2838                         if (!empty($item['plink'])) {
2839                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
2840                                 $ret["title"] = DI::l10n()->t('link to source');
2841                         }
2842                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
2843                         $ret = [
2844                                 'href' => $item['plink'],
2845                                 'orig' => $item['plink'],
2846                                 'title' => DI::l10n()->t('link to source'),
2847                         ];
2848                 } else {
2849                         $ret = [];
2850                 }
2851
2852                 return $ret;
2853         }
2854
2855         /**
2856          * Is the given item array a post that is sent as starting post to a forum?
2857          *
2858          * @param array $item
2859          * @param array $owner
2860          *
2861          * @return boolean "true" when it is a forum post
2862          */
2863         public static function isForumPost(array $item, array $owner = [])
2864         {
2865                 if (empty($owner)) {
2866                         $owner = User::getOwnerDataById($item['uid']);
2867                         if (empty($owner)) {
2868                                 return false;
2869                         }
2870                 }
2871
2872                 if (($item['author-id'] == $item['owner-id']) ||
2873                         ($owner['id'] == $item['contact-id']) ||
2874                         ($item['uri-id'] != $item['parent-uri-id']) ||
2875                         $item['origin']) {
2876                         return false;
2877                 }
2878
2879                 return Contact::isForum($item['contact-id']);
2880         }
2881
2882         /**
2883          * Search item id for given URI or plink
2884          *
2885          * @param string $uri
2886          * @param integer $uid
2887          *
2888          * @return integer item id
2889          */
2890         public static function searchByLink($uri, $uid = 0)
2891         {
2892                 $ssl_uri = str_replace('http://', 'https://', $uri);
2893                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2894
2895                 $item = Post::selectFirst(['id'], ['uri' => $uris, 'uid' => $uid]);
2896                 if (DBA::isResult($item)) {
2897                         return $item['id'];
2898                 }
2899
2900                 $item = Post::selectFirst(['id'], ['plink' => $uris, 'uid' => $uid]);
2901                 if (DBA::isResult($item)) {
2902                         return $item['id'];
2903                 }
2904
2905                 return 0;
2906         }
2907
2908         /**
2909          * Return the URI for a link to the post
2910          *
2911          * @param string $uri URI or link to post
2912          *
2913          * @return string URI
2914          */
2915         public static function getURIByLink(string $uri)
2916         {
2917                 $ssl_uri = str_replace('http://', 'https://', $uri);
2918                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2919
2920                 $item = Post::selectFirst(['uri'], ['uri' => $uris]);
2921                 if (DBA::isResult($item)) {
2922                         return $item['uri'];
2923                 }
2924
2925                 $item = Post::selectFirst(['uri'], ['plink' => $uris]);
2926                 if (DBA::isResult($item)) {
2927                         return $item['uri'];
2928                 }
2929
2930                 return '';
2931         }
2932
2933         /**
2934          * Fetches item for given URI or plink
2935          *
2936          * @param string $uri
2937          * @param integer $uid
2938          *
2939          * @return integer item id
2940          */
2941         public static function fetchByLink(string $uri, int $uid = 0)
2942         {
2943                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
2944                 $item_id = self::searchByLink($uri, $uid);
2945                 if (!empty($item_id)) {
2946                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2947                         return $item_id;
2948                 }
2949
2950                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
2951                         $item_id = self::searchByLink($fetched_uri, $uid);
2952                 } else {
2953                         $item_id = Diaspora::fetchByURL($uri);
2954                 }
2955
2956                 if (!empty($item_id)) {
2957                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2958                         return $item_id;
2959                 }
2960
2961                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
2962                 return 0;
2963         }
2964
2965         /**
2966          * Return share data from an item array (if the item is shared item)
2967          * We are providing the complete Item array, because at some time in the future
2968          * we hopefully will define these values not in the body anymore but in some item fields.
2969          * This function is meant to replace all similar functions in the system.
2970          *
2971          * @param array $item
2972          *
2973          * @return array with share information
2974          */
2975         public static function getShareArray($item)
2976         {
2977                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
2978                         return [];
2979                 }
2980
2981                 $attribute_string = $matches[2];
2982                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
2983                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
2984                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
2985                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
2986                         }
2987                 }
2988                 return $attributes;
2989         }
2990
2991         /**
2992          * Fetch item information for shared items from the original items and adds it.
2993          *
2994          * @param array $item
2995          *
2996          * @return array item array with data from the original item
2997          */
2998         public static function addShareDataFromOriginal(array $item)
2999         {
3000                 $shared = self::getShareArray($item);
3001                 if (empty($shared)) {
3002                         return $item;
3003                 }
3004
3005                 // Real reshares always have got a GUID.
3006                 if (empty($shared['guid'])) {
3007                         return $item;
3008                 }
3009
3010                 $uid = $item['uid'] ?? 0;
3011
3012                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
3013                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
3014                 if (!DBA::isResult($shared_item)) {
3015                         if (empty($shared['link'])) {
3016                                 return $item;
3017                         }
3018
3019                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
3020                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
3021                         if (empty($id)) {
3022                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
3023                                 return $item;
3024                         }
3025
3026                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
3027                         if (!DBA::isResult($shared_item)) {
3028                                 return $item;
3029                         }
3030                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
3031                 } else {
3032                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
3033                 }
3034
3035                 if (!empty($shared_item['title'])) {
3036                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
3037                         unset($shared_item['title']);
3038                 } else {
3039                         $body = $shared_item['body'];
3040                 }
3041
3042                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
3043                 unset($shared_item['body']);
3044
3045                 return array_merge($item, $shared_item);
3046         }
3047
3048         /**
3049          * Check a prospective item array against user-level permissions
3050          *
3051          * @param array $item Expected keys: uri, gravity, and
3052          *                    author-link if is author-id is set,
3053          *                    owner-link if is owner-id is set,
3054          *                    causer-link if is causer-id is set.
3055          * @param int   $user_id Local user ID
3056          * @return bool
3057          * @throws \Exception
3058          */
3059         protected static function isAllowedByUser(array $item, int $user_id)
3060         {
3061                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3062                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3063                         return false;
3064                 }
3065
3066                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3067                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3068                         return false;
3069                 }
3070
3071                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3072                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3073                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3074                         return false;
3075                 }
3076
3077                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3078                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3079                         return false;
3080                 }
3081
3082                 return true;
3083         }
3084 }