src/Model/Item.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   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\DI;
  36 use Friendica\Model\Post;
  37 use Friendica\Protocol\Activity;
  38 use Friendica\Protocol\ActivityPub;
  39 use Friendica\Protocol\Diaspora;
  40 use Friendica\Util\DateTimeFormat;
  41 use Friendica\Util\Map;
  42 use Friendica\Util\Network;
  43 use Friendica\Util\Proxy;
  44 use Friendica\Util\Strings;
  45 use Friendica\Util\Temporal;
  46 use Friendica\Worker\Delivery;
  47 use LanguageDetection\Language;
  48
  49 class Item
  50 {
  51         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  52         const PT_ARTICLE = 0;
  53         const PT_NOTE = 1;
  54         const PT_PAGE = 2;
  55         const PT_IMAGE = 16;
  56         const PT_AUDIO = 17;
  57         const PT_VIDEO = 18;
  58         const PT_DOCUMENT = 19;
  59         const PT_EVENT = 32;
  60         const PT_POLL = 33;
  61         const PT_PERSONAL_NOTE = 128;
  62
  63         // Posting reasons (Why had a post been stored for a user?)
  64         const PR_NONE = 0;
  65         const PR_TAG = 64;
  66         const PR_TO = 65;
  67         const PR_CC = 66;
  68         const PR_BTO = 67;
  69         const PR_BCC = 68;
  70         const PR_FOLLOWER = 69;
  71         const PR_ANNOUNCEMENT = 70;
  72         const PR_COMMENT = 71;
  73         const PR_STORED = 72;
  74         const PR_GLOBAL = 73;
  75         const PR_RELAY = 74;
  76         const PR_FETCHED = 75;
  77
  78         // system.accept_only_sharer setting values
  79         const COMPLETION_NONE    = 1;
  80         const COMPLETION_COMMENT = 0;
  81         const COMPLETION_LIKE    = 2;
  82
  83         // Field list that is used to display the items
  84         const DISPLAY_FIELDLIST = [
  85                 'uid', 'id', 'parent', 'guid', 'network', 'gravity',
  86                 'uri-id', 'uri', 'thr-parent-id', 'thr-parent', 'parent-uri-id', 'parent-uri',
  87                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  88                 'wall', 'private', 'starred', 'origin', 'parent-origin', 'title', 'body', 'language',
  89                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  90                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'mention', 'global',
  91                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network', 'author-updated', 'author-gsid', 'author-addr', 'author-uri-id',
  92                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network', 'owner-contact-type', 'owner-updated',
  93                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type', 'causer-network',
  94                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  95                 'writable', 'self', 'cid', 'alias',
  96                 'event-created', 'event-edited', 'event-start', 'event-finish',
  97                 'event-summary', 'event-desc', 'event-location', 'event-type',
  98                 'event-nofinish', 'event-ignore', 'event-id',
  99                 "question-id", "question-multiple", "question-voters", "question-end-time",
 100                 "has-categories", "has-media",
 101                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
 102         ];
 103
 104         // Field list that is used to deliver items via the protocols
 105         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
 106                         'parent-guid', 'received', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
 107                         'private', 'title', 'body', 'raw-body', 'location', 'coord', 'app',
 108                         'inform', 'deleted', 'extid', 'post-type', 'post-reason', 'gravity',
 109                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 110                         'author-id', 'author-link', 'author-name', 'author-avatar', 'owner-id', 'owner-link', 'contact-uid',
 111                         'signed_text', 'network', 'wall', 'contact-id', 'plink', 'origin',
 112                         'thr-parent-id', 'parent-uri-id', 'postopts', 'pubmail',
 113                         'event-created', 'event-edited', 'event-start', 'event-finish',
 114                         'event-summary', 'event-desc', 'event-location', 'event-type',
 115                         'event-nofinish', 'event-ignore', 'event-id'];
 116
 117         // All fields in the item table
 118         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 119                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 120                         'contact-id', 'wall', 'gravity', 'extid', 'psid',
 121                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 122                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 123                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type', 'post-reason',
 124                         'private', 'pubmail', 'visible', 'starred',
 125                         'unseen', 'deleted', 'origin', 'mention', 'global', 'network',
 126                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 127                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 128                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 129                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 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($fields)) {
 160                         return false;
 161                 }
 162
 163                 if (isset($fields['extid'])) {
 164                         $fields['external-id'] = ItemURI::getIdByURI($fields['extid']);
 165                 }
 166
 167                 if (!empty($fields['verb'])) {
 168                         $fields['vid'] = Verb::getID($fields['verb']);
 169                 }
 170
 171                 if (!empty($fields['edited'])) {
 172                         $previous = Post::selectFirst(['edited'], $condition);
 173                 }
 174
 175                 $rows = Post::update($fields, $condition);
 176                 if (is_bool($rows)) {
 177                         return $rows;
 178                 }
 179
 180                 // We only need to call the line by line update for specific fields
 181                 if (empty($fields['body']) && empty($fields['file']) &&
 182                         empty($fields['attach']) && empty($fields['edited'])) {
 183                         return $rows;
 184                 }
 185
 186                 Logger::info('Updating per single row method', ['fields' => $fields, 'condition' => $condition]);
 187
 188                 $items = Post::select(['id', 'origin', 'uri-id', 'uid', 'author-network'], $condition);
 189
 190                 $notify_items = [];
 191
 192                 while ($item = DBA::fetch($items)) {
 193                         if (!empty($fields['body'])) {
 194                                 Post\Media::insertFromAttachmentData($item['uri-id'], $fields['body']);
 195
 196                                 $content_fields = ['raw-body' => trim($fields['raw-body'] ?? $fields['body'])];
 197
 198                                 // Remove all media attachments from the body and store them in the post-media table
 199                                 // @todo On shared postings (Diaspora style and commented reshare) don't fetch content from the shared part
 200                                 $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 201                                 $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 202
 203                                 if ($item['author-network'] != Protocol::DFRN) {
 204                                         Post\Media::insertFromRelevantUrl($item['uri-id'], $content_fields['raw-body']);
 205                                 }
 206
 207                                 Post\Content::update($item['uri-id'], $content_fields);
 208                         }
 209
 210                         if (!empty($fields['file'])) {
 211                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $fields['file']);
 212                         }
 213
 214                         if (!empty($fields['attach'])) {
 215                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 216                         }
 217
 218                         // We only need to notfiy others when it is an original entry from us.
 219                         // Only call the notifier when the item had been edited and records had been changed.
 220                         if ($item['origin'] && !empty($fields['edited']) && ($previous['edited'] != $fields['edited'])) {
 221                                 $notify_items[] = $item['id'];
 222                         }
 223                 }
 224
 225                 DBA::close($items);
 226
 227                 foreach ($notify_items as $notify_item) {
 228                         $post = Post::selectFirst(['uri-id', 'uid'], ['id' => $notify_item]);
 229                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, (int)$post['uri-id'], (int)$post['uid']);
 230                 }
 231
 232                 return $rows;
 233         }
 234
 235         /**
 236          * Delete an item and notify others about it - if it was ours
 237          *
 238          * @param array   $condition The condition for finding the item entries
 239          * @param integer $priority  Priority for the notification
 240          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 241          */
 242         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 243         {
 244                 $items = Post::select(['id'], $condition);
 245                 while ($item = Post::fetch($items)) {
 246                         self::markForDeletionById($item['id'], $priority);
 247                 }
 248                 DBA::close($items);
 249         }
 250
 251         /**
 252          * Delete an item for an user and notify others about it - if it was ours
 253          *
 254          * @param array   $condition The condition for finding the item entries
 255          * @param integer $uid       User who wants to delete this item
 256          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 257          */
 258         public static function deleteForUser(array $condition, int $uid)
 259         {
 260                 if ($uid == 0) {
 261                         return;
 262                 }
 263
 264                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 265                 while ($item = Post::fetch($items)) {
 266                         if (in_array($item['uid'], [$uid, 0])) {
 267                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 268                                 Post\ThreadUser::update($item['uri-id'], $uid, ['hidden' => true], true);
 269                         }
 270
 271                         if ($item['uid'] == $uid) {
 272                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 273                         } elseif ($item['uid'] != 0) {
 274                                 Logger::notice('Wrong ownership. Not deleting item', ['id' => $item['id']]);
 275                         }
 276                 }
 277                 DBA::close($items);
 278         }
 279
 280         /**
 281          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 282          *
 283          * @param integer $item_id
 284          * @param integer $priority Priority for the notification
 285          *
 286          * @return boolean success
 287          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 288          */
 289         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 290         {
 291                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 292                 // locate item to be deleted
 293                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri-id', 'origin',
 294                         'deleted', 'resource-id', 'event-id',
 295                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 296                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 297                 if (!DBA::isResult($item)) {
 298                         Logger::info('Item not found.', ['id' => $item_id]);
 299                         return false;
 300                 }
 301
 302                 if ($item['deleted']) {
 303                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 304                         return false;
 305                 }
 306
 307                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 308                 if (!DBA::isResult($parent)) {
 309                         $parent = ['origin' => false];
 310                 }
 311
 312                 // clean up categories and tags so they don't end up as orphans
 313                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 314
 315                 /*
 316                  * If item is a link to a photo resource, nuke all the associated photos
 317                  * (visitors will not have photo resources)
 318                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 319                  * generate a resource-id and therefore aren't intimately linked to the item.
 320                  */
 321                 /// @TODO: this should first check if photo is used elsewhere
 322                 if (strlen($item['resource-id'])) {
 323                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 324                 }
 325
 326                 // If item is a link to an event, delete the event.
 327                 if (intval($item['event-id'])) {
 328                         Event::delete($item['event-id']);
 329                 }
 330
 331                 // If item has attachments, drop them
 332                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 333                 foreach($attachments as $attachment) {
 334                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 335                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 336                         }
 337                 }
 338
 339                 // Set the item to "deleted"
 340                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 341                 Post::update($item_fields, ['id' => $item['id']]);
 342
 343                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 344
 345                 if (!Post::exists(["`uri-id` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri-id']])) {
 346                         self::markForDeletion(['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false], $priority);
 347                 }
 348
 349                 Post\DeliveryData::delete($item['uri-id']);
 350
 351                 // If it's the parent of a comment thread, kill all the kids
 352                 if ($item['gravity'] == GRAVITY_PARENT) {
 353                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 354                 }
 355
 356                 // Is it our comment and/or our thread?
 357                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 358                         // When we delete the original post we will delete all existing copies on the server as well
 359                         self::markForDeletion(['uri-id' => $item['uri-id'], 'deleted' => false], $priority);
 360
 361                         // send the notification upstream/downstream
 362                         if ($priority) {
 363                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, (int)$item['uri-id'], (int)$item['uid']);
 364                         }
 365                 } elseif ($item['uid'] != 0) {
 366                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 367                         Post\ThreadUser::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 368                 }
 369
 370                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 371
 372                 return true;
 373         }
 374
 375         public static function guid($item, $notify)
 376         {
 377                 if (!empty($item['guid'])) {
 378                         return trim($item['guid']);
 379                 }
 380
 381                 if ($notify) {
 382                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 383                         // We add the hash of our own host because our host is the original creator of the post.
 384                         $prefix_host = DI::baseUrl()->getHostname();
 385                 } else {
 386                         $prefix_host = '';
 387
 388                         // We are only storing the post so we create a GUID from the original hostname.
 389                         if (!empty($item['author-link'])) {
 390                                 $parsed = parse_url($item['author-link']);
 391                                 if (!empty($parsed['host'])) {
 392                                         $prefix_host = $parsed['host'];
 393                                 }
 394                         }
 395
 396                         if (empty($prefix_host) && !empty($item['plink'])) {
 397                                 $parsed = parse_url($item['plink']);
 398                                 if (!empty($parsed['host'])) {
 399                                         $prefix_host = $parsed['host'];
 400                                 }
 401                         }
 402
 403                         if (empty($prefix_host) && !empty($item['uri'])) {
 404                                 $parsed = parse_url($item['uri']);
 405                                 if (!empty($parsed['host'])) {
 406                                         $prefix_host = $parsed['host'];
 407                                 }
 408                         }
 409
 410                         // Is it in the format data@host.tld? - Used for mail contacts
 411                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 412                                 $mailparts = explode('@', $item['author-link']);
 413                                 $prefix_host = array_pop($mailparts);
 414                         }
 415                 }
 416
 417                 if (!empty($item['plink'])) {
 418                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 419                 } elseif (!empty($item['uri'])) {
 420                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 421                 } else {
 422                         $guid = System::createUUID(hash('crc32', $prefix_host));
 423                 }
 424
 425                 return $guid;
 426         }
 427
 428         private static function contactId($item)
 429         {
 430                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 431                         return $item['contact-id'];
 432                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 433                         return $item['contact-id'];
 434                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 435                         return $item['author-id'];
 436                 } elseif (!empty($item['contact-id'])) {
 437                         return $item['contact-id'];
 438                 } else {
 439                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 440                         if (!empty($contact_id)) {
 441                                 return $contact_id;
 442                         }
 443                 }
 444                 return $item['author-id'];
 445         }
 446
 447         /**
 448          * Write an item array into a spool file to be inserted later.
 449          * This command is called whenever there are issues storing an item.
 450          *
 451          * @param array $item The item fields that are to be inserted
 452          * @throws \Exception
 453          */
 454         private static function spool($orig_item)
 455         {
 456                 // Now we store the data in the spool directory
 457                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 458                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 459
 460                 $spoolpath = System::getSpoolPath();
 461                 if ($spoolpath != "") {
 462                         $spool = $spoolpath . '/' . $file;
 463
 464                         file_put_contents($spool, json_encode($orig_item));
 465                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 466                 }
 467         }
 468
 469         /**
 470          * Check if the item array is a duplicate
 471          *
 472          * @param array $item
 473          * @return boolean is it a duplicate?
 474          */
 475         private static function isDuplicate(array $item)
 476         {
 477                 // Checking if there is already an item with the same guid
 478                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 479                 if (Post::exists($condition)) {
 480                         Logger::notice('Found already existing item', $condition);
 481                         return true;
 482                 }
 483
 484                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'],
 485                         'network' => [$item['network'], Protocol::DFRN]];
 486                 if (Post::exists($condition)) {
 487                         Logger::notice('duplicated item with the same uri found.', $condition);
 488                         return true;
 489                 }
 490
 491                 // On Friendica and Diaspora the GUID is unique
 492                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 493                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 494                         if (Post::exists($condition)) {
 495                                 Logger::notice('duplicated item with the same guid found.', $condition);
 496                                 return true;
 497                         }
 498                 } elseif ($item['network'] == Protocol::OSTATUS) {
 499                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 500                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 501                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 502                         if (Post::exists($condition)) {
 503                                 Logger::notice('duplicated item with the same body found.', $item);
 504                                 return true;
 505                         }
 506                 }
 507
 508                 /*
 509                  * Check for already added items.
 510                  * There is a timing issue here that sometimes creates double postings.
 511                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 512                  */
 513                 if (($item['uid'] == 0) && Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
 514                         Logger::notice('Global item already stored.', ['uri-id' => $item['uri-id'], 'network' => $item['network']]);
 515                         return true;
 516                 }
 517
 518                 return false;
 519         }
 520
 521         /**
 522          * Check if the item array is valid
 523          *
 524          * @param array $item
 525          * @return boolean item is valid
 526          */
 527         public static function isValid(array $item)
 528         {
 529                 // When there is no content then we don't post it
 530                 if (($item['body'] . $item['title'] == '') && (empty($item['uri-id']) || !Post\Media::existsByURIId($item['uri-id']))) {
 531                         Logger::notice('No body, no title.');
 532                         return false;
 533                 }
 534
 535                 if (!empty($item['uid'])) {
 536                         $owner = User::getOwnerDataById($item['uid'], false);
 537                         if (!$owner) {
 538                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 539                                 return false;
 540                         }
 541
 542                         if ($owner['account_expired'] || $owner['account_removed']) {
 543                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 544                                 return false;
 545                         }
 546                 }
 547
 548                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 549                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 550                         return false;
 551                 }
 552
 553                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 554                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 555                         return false;
 556                 }
 557
 558                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 559                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 560                         return false;
 561                 }
 562
 563                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 564                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 565                         return false;
 566                 }
 567
 568                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 569                         return false;
 570                 }
 571
 572                 if ($item['verb'] == Activity::FOLLOW) {
 573                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 574                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 575                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 576                                 return false;
 577                         }
 578
 579                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 580                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 581                         if (Post::exists($condition)) {
 582                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 583                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 584                                 return false;
 585                         }
 586                 }
 587
 588                 return true;
 589         }
 590
 591         /**
 592          * Check if the item array is too old
 593          *
 594          * @param array $item
 595          * @return boolean item is too old
 596          */
 597         public static function isTooOld(array $item)
 598         {
 599                 // check for create date and expire time
 600                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 601
 602                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 603                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 604                         $expire_interval = $user['expire'];
 605                 }
 606
 607                 if (($expire_interval > 0) && !empty($item['created'])) {
 608                         $expire_date = time() - ($expire_interval * 86400);
 609                         $created_date = strtotime($item['created']);
 610                         if ($created_date < $expire_date) {
 611                                 Logger::notice('Item created before expiration interval.', [
 612                                         'created' => date('c', $created_date),
 613                                         'expired' => date('c', $expire_date),
 614                                         '$item' => $item
 615                                 ]);
 616                                 return true;
 617                         }
 618                 }
 619
 620                 return false;
 621         }
 622
 623         /**
 624          * Return the id of the given item array if it has been stored before
 625          *
 626          * @param array $item
 627          * @return integer item id
 628          */
 629         private static function getDuplicateID(array $item)
 630         {
 631                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 632                         $condition = ["`uri-id` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 633                                 $item['uri-id'], $item['uid'],
 634                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 635                         $existing = Post::selectFirst(['id', 'network'], $condition);
 636                         if (DBA::isResult($existing)) {
 637                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 638                                 if ($item['uid'] != 0) {
 639                                         Logger::notice('Item already existed for user', [
 640                                                 'uri-id' => $item['uri-id'],
 641                                                 'uid' => $item['uid'],
 642                                                 'network' => $item['network'],
 643                                                 'existing_id' => $existing["id"],
 644                                                 'existing_network' => $existing["network"]
 645                                         ]);
 646                                 }
 647
 648                                 return $existing["id"];
 649                         }
 650                 }
 651                 return 0;
 652         }
 653
 654         /**
 655          * Fetch top-level parent data for the given item array
 656          *
 657          * @param array $item
 658          * @return array item array with parent data
 659          * @throws \Exception
 660          */
 661         private static function getTopLevelParent(array $item)
 662         {
 663                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 664                         'uri-id', 'parent-uri-id',
 665                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 666                         'wall', 'private', 'origin', 'author-id'];
 667                 $condition = ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']];
 668                 $params = ['order' => ['id' => false]];
 669                 $parent = Post::selectFirst($fields, $condition, $params);
 670
 671                 if (!DBA::isResult($parent) && $item['origin']) {
 672                         $stored = Item::storeForUserByUriId($item['thr-parent-id'], $item['uid']);
 673                         Logger::info('Stored thread parent item for user', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid'], 'stored' => $stored]);
 674                         $parent = Post::selectFirst($fields, $condition, $params);
 675                 }
 676
 677                 if (!DBA::isResult($parent)) {
 678                         Logger::notice('item parent was not found - ignoring item', ['thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 679                         return [];
 680                 }
 681
 682                 if ($parent['uri-id'] == $parent['parent-uri-id']) {
 683                         return $parent;
 684                 }
 685
 686                 $condition = ['uri-id' => $parent['parent-uri-id'],
 687                         'parent-uri-id' => $parent['parent-uri-id'],
 688                         'uid' => $parent['uid']];
 689                 $params = ['order' => ['id' => false]];
 690                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 691
 692                 if (!DBA::isResult($toplevel_parent) && $item['origin']) {
 693                         $stored = Item::storeForUserByUriId($item['parent-uri-id'], $item['uid']);
 694                         Logger::info('Stored parent item for user', ['uri-id' => $item['parent-uri-id'], 'uid' => $item['uid'], 'stored' => $stored]);
 695                         $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 696                 }
 697
 698                 if (!DBA::isResult($toplevel_parent)) {
 699                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri-id' => $parent['parent-uri-id'], 'uid' => $parent['uid']]);
 700                         return [];
 701                 }
 702
 703                 return $toplevel_parent;
 704         }
 705
 706         /**
 707          * Get the gravity for the given item array
 708          *
 709          * @param array $item
 710          * @return integer gravity
 711          */
 712         private static function getGravity(array $item): int
 713         {
 714                 $activity = DI::activity();
 715
 716                 if (isset($item['gravity'])) {
 717                         return intval($item['gravity']);
 718                 } elseif ($item['parent-uri-id'] === $item['uri-id']) {
 719                         return GRAVITY_PARENT;
 720                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 721                         return GRAVITY_COMMENT;
 722                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 723                         return GRAVITY_ACTIVITY;
 724                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 725                         return GRAVITY_ACTIVITY;
 726                 }
 727                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 728                 return GRAVITY_UNKNOWN;   // Should not happen
 729         }
 730
 731         public static function insert(array $item, int $notify = 0, bool $post_local = true)
 732         {
 733                 $orig_item = $item;
 734
 735                 $priority = PRIORITY_HIGH;
 736
 737                 // If it is a posting where users should get notifications, then define it as wall posting
 738                 if ($notify) {
 739                         $item['wall'] = 1;
 740                         $item['origin'] = 1;
 741                         $item['network'] = Protocol::DFRN;
 742                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 743                         $item['direction'] = Conversation::PUSH;
 744
 745                         if (is_int($notify) && in_array($notify, PRIORITIES)) {
 746                                 $priority = $notify;
 747                         }
 748                 } else {
 749                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 750                 }
 751
 752                 $uid = intval($item['uid']);
 753
 754                 $item['guid'] = self::guid($item, $notify);
 755                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 756
 757                 // Store URI data
 758                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 759
 760                 // Backward compatibility: parent-uri used to be the direct parent uri.
 761                 // If it is provided without a thr-parent, it probably is the old behavior.
 762                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 763                 $item['parent-uri'] = $item['thr-parent'];
 764
 765                 $item['thr-parent-id'] = $item['parent-uri-id'] = ItemURI::getIdByURI($item['thr-parent']);
 766
 767                 // Store conversation data
 768                 $item = Conversation::insert($item);
 769
 770                 /*
 771                  * Do we already have this item?
 772                  * We have to check several networks since Friendica posts could be repeated
 773                  * via OStatus (maybe Diasporsa as well)
 774                  */
 775                 $duplicate = self::getDuplicateID($item);
 776                 if ($duplicate) {
 777                         return $duplicate;
 778                 }
 779
 780                 // Additional duplicate checks
 781                 /// @todo Check why the first duplication check returns the item number and the second a 0
 782                 if (self::isDuplicate($item)) {
 783                         return 0;
 784                 }
 785
 786                 if (!isset($item['post-type'])) {
 787                         $item['post-type'] = empty($item['title']) ? self::PT_NOTE : self::PT_ARTICLE;
 788                 }
 789
 790                 $item['wall']          = intval($item['wall'] ?? 0);
 791                 $item['extid']         = trim($item['extid'] ?? '');
 792                 $item['author-name']   = trim($item['author-name'] ?? '');
 793                 $item['author-link']   = trim($item['author-link'] ?? '');
 794                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 795                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 796                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 797                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 798                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 799                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 800                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 801                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 802                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 803                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 804                 $item['location']      = trim($item['location'] ?? '');
 805                 $item['coord']         = trim($item['coord'] ?? '');
 806                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 807                 $item['deleted']       = 0;
 808                 $item['verb']          = trim($item['verb'] ?? '');
 809                 $item['object-type']   = trim($item['object-type'] ?? '');
 810                 $item['object']        = trim($item['object'] ?? '');
 811                 $item['target-type']   = trim($item['target-type'] ?? '');
 812                 $item['target']        = trim($item['target'] ?? '');
 813                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 814                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 815                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 816                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 817                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 818                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 819                 $item['body']          = trim($item['body'] ?? '');
 820                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 821                 $item['app']           = trim($item['app'] ?? '');
 822                 $item['origin']        = intval($item['origin'] ?? 0);
 823                 $item['postopts']      = trim($item['postopts'] ?? '');
 824                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 825                 $item['event-id']      = intval($item['event-id'] ?? 0);
 826                 $item['inform']        = trim($item['inform'] ?? '');
 827                 $item['file']          = trim($item['file'] ?? '');
 828
 829                 // Communities aren't working with the Diaspora protoccol
 830                 if (($uid != 0) && ($item['network'] == Protocol::DIASPORA)) {
 831                         $user = User::getById($uid, ['account-type']);
 832                         if ($user['account-type'] == Contact::TYPE_COMMUNITY) {
 833                                 Logger::info('Community posts are not supported via Diaspora');
 834                                 return 0;
 835                         }
 836                 }
 837
 838                 // Items cannot be stored before they happen ...
 839                 if ($item['created'] > DateTimeFormat::utcNow()) {
 840                         $item['created'] = DateTimeFormat::utcNow();
 841                 }
 842
 843                 // We haven't invented time travel by now.
 844                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 845                         $item['edited'] = DateTimeFormat::utcNow();
 846                 }
 847
 848                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 849
 850                 $item['gravity'] = self::getGravity($item);
 851
 852                 $item['language'] = self::getLanguage($item);
 853
 854                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 855                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 856                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 857
 858                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 859                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 860                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 861
 862                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 863                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 864                         $item['post-reason'] = self::PR_FOLLOWER;
 865                 }
 866
 867                 // Ensure that there is an avatar cache
 868                 Contact::checkAvatarCache($item['author-id']);
 869                 Contact::checkAvatarCache($item['owner-id']);
 870
 871                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 872                 $item["contact-id"] = self::contactId($item);
 873
 874                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 875                         empty($item['origin']) &&self::isTooOld($item)) {
 876                         Logger::info('Item is too old', ['item' => $item]);
 877                         return 0;
 878                 }
 879
 880                 if (!self::isValid($item)) {
 881                         return 0;
 882                 }
 883
 884                 if ($item['gravity'] !== GRAVITY_PARENT) {
 885                         $toplevel_parent = self::getTopLevelParent($item);
 886                         if (empty($toplevel_parent)) {
 887                                 return 0;
 888                         }
 889
 890                         // If the thread originated from this node, we check the permission against the thread starter
 891                         $condition = ['uri-id' => $toplevel_parent['uri-id'], 'wall' => true];
 892                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 893                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 894                                 return 0;
 895                         }
 896
 897                         $parent_id             = $toplevel_parent['id'];
 898                         $item['parent-uri']    = $toplevel_parent['uri'];
 899                         $item['parent-uri-id'] = $toplevel_parent['uri-id'];
 900                         $item['deleted']       = $toplevel_parent['deleted'];
 901
 902                         // Reshares have to keep their permissions to allow forums to work
 903                         if (!$item['origin'] || ($item['verb'] != Activity::ANNOUNCE)) {
 904                                 $item['allow_cid']     = $toplevel_parent['allow_cid'];
 905                                 $item['allow_gid']     = $toplevel_parent['allow_gid'];
 906                                 $item['deny_cid']      = $toplevel_parent['deny_cid'];
 907                                 $item['deny_gid']      = $toplevel_parent['deny_gid'];
 908                         }
 909
 910                         $parent_origin         = $toplevel_parent['origin'];
 911
 912                         // Don't federate received participation messages
 913                         if ($item['verb'] != Activity::FOLLOW) {
 914                                 $item['wall'] = $toplevel_parent['wall'];
 915                         } else {
 916                                 $item['wall'] = false;
 917                                 // Participations are technical messages, so they are set to "seen" automatically
 918                                 $item['unseen'] = false;
 919                         }
 920
 921                         /*
 922                          * If the parent is private, force privacy for the entire conversation
 923                          * This differs from the above settings as it subtly allows comments from
 924                          * email correspondents to be private even if the overall thread is not.
 925                          */
 926                         if ($toplevel_parent['private']) {
 927                                 $item['private'] = $toplevel_parent['private'];
 928                         }
 929
 930                         // If its a post that originated here then tag the thread as "mention"
 931                         if ($item['origin'] && $item['uid']) {
 932                                 DBA::update('post-thread-user', ['mention' => true], ['uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 933                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'parent-uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 934                         }
 935
 936                         // Update the contact relations
 937                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 938                 } else {
 939                         $parent_id = 0;
 940                         $parent_origin = $item['origin'];
 941                 }
 942
 943                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
 944                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
 945
 946                 // Is this item available in the global items (with uid=0)?
 947                 if ($item["uid"] == 0) {
 948                         $item["global"] = true;
 949
 950                         // Set the global flag on all items if this was a global item entry
 951                         Post::update(['global' => true], ['uri-id' => $item['uri-id']]);
 952                 } else {
 953                         $item['global'] = Post::exists(['uid' => 0, 'uri-id' => $item['uri-id']]);
 954                 }
 955
 956                 // ACL settings
 957                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
 958                         $item["private"] = self::PRIVATE;
 959                 }
 960
 961                 if ($notify && $post_local) {
 962                         $item['edit'] = false;
 963                         $item['parent'] = $parent_id;
 964
 965                         // Trigger automatic reactions for addons
 966                         if (!isset($item['api_source'])) {
 967                                 $item['api_source'] = true;
 968                         }
 969
 970                         // We have to tell the hooks who we are - this really should be improved
 971                         if (!local_user()) {
 972                                 $_SESSION['authenticated'] = true;
 973                                 $_SESSION['uid'] = $uid;
 974                                 $dummy_session = true;
 975                         } else {
 976                                 $dummy_session = false;
 977                         }
 978
 979                         Hook::callAll('post_local', $item);
 980
 981                         if ($dummy_session) {
 982                                 unset($_SESSION['authenticated']);
 983                                 unset($_SESSION['uid']);
 984                         }
 985                 } elseif (!$notify) {
 986                         Hook::callAll('post_remote', $item);
 987                 }
 988
 989                 if (!empty($item['cancel'])) {
 990                         Logger::notice('post cancelled by addon.');
 991                         return 0;
 992                 }
 993
 994                 if (empty($item['vid']) && !empty($item['verb'])) {
 995                         $item['vid'] = Verb::getID($item['verb']);
 996                 }
 997
 998                 // Creates or assigns the permission set
 999                 $item['psid'] = DI::permissionSet()->selectOrCreate(
1000                         DI::permissionSetFactory()->createFromString(
1001                                 $item['uid'],
1002                                 $item['allow_cid'],
1003                                 $item['allow_gid'],
1004                                 $item['deny_cid'],
1005                                 $item['deny_gid']
1006                 ))->id;
1007
1008                 if (!empty($item['extid'])) {
1009                         $item['external-id'] = ItemURI::getIdByURI($item['extid']);
1010                 }
1011
1012                 if ($item['verb'] == Activity::ANNOUNCE) {
1013                         self::setOwnerforResharedItem($item);
1014                 }
1015
1016                 if (isset($item['attachments'])) {
1017                         foreach ($item['attachments'] as $attachment) {
1018                                 $attachment['uri-id'] = $item['uri-id'];
1019                                 Post\Media::insert($attachment);
1020                         }
1021                         unset($item['attachments']);
1022                 }
1023
1024                 Post\Media::insertFromAttachmentData($item['uri-id'], $item['body']);
1025
1026                 // Remove all media attachments from the body and store them in the post-media table
1027                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
1028                 $item['raw-body'] = self::setHashtags($item['raw-body']);
1029
1030                 if (!DBA::exists('contact', ['id' => $item['author-id'], 'network' => Protocol::DFRN])) {
1031                         Post\Media::insertFromRelevantUrl($item['uri-id'], $item['raw-body']);
1032                 }
1033
1034                 // Check for hashtags in the body and repair or add hashtag links
1035                 $item['body'] = self::setHashtags($item['body']);
1036
1037                 if (stristr($item['verb'], Activity::POKE)) {
1038                         $notify_type = Delivery::POKE;
1039                 } else {
1040                         $notify_type = Delivery::POST;
1041                 }
1042
1043                 // Filling item related side tables
1044                 if (!empty($item['attach'])) {
1045                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
1046                 }
1047
1048                 if (empty($item['event-id'])) {
1049                         unset($item['event-id']);
1050
1051                         $ev = Event::fromBBCode($item['body']);
1052                         if ((!empty($ev['desc']) || !empty($ev['summary'])) && !empty($ev['start'])) {
1053                                 Logger::info('Event found.');
1054                                 $ev['cid']       = $item['contact-id'];
1055                                 $ev['uid']       = $item['uid'];
1056                                 $ev['uri']       = $item['uri'];
1057                                 $ev['edited']    = $item['edited'];
1058                                 $ev['private']   = $item['private'];
1059                                 $ev['guid']      = $item['guid'];
1060                                 $ev['plink']     = $item['plink'];
1061                                 $ev['network']   = $item['network'];
1062                                 $ev['protocol']  = $item['protocol'] ?? Conversation::PARCEL_UNKNOWN;
1063                                 $ev['direction'] = $item['direction'] ?? Conversation::UNKNOWN;
1064                                 $ev['source']    = $item['source'] ?? '';
1065
1066                                 $event = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
1067                                 if (DBA::isResult($event)) {
1068                                         $ev['id'] = $event['id'];
1069                                 }
1070
1071                                 $event_id = Event::store($ev);
1072                                 $item = Event::getItemArrayForImportedId($event_id, $item);
1073
1074                                 Logger::info('Event was stored', ['id' => $event_id]);
1075                         }
1076                 }
1077
1078                 if (empty($item['causer-id'])) {
1079                         unset($item['causer-id']);
1080                 }
1081
1082                 if (in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1083                         $content_warning = BBCode::getAbstract($item['body'], Protocol::ACTIVITYPUB);
1084                         if (!empty($content_warning) && empty($item['content-warning'])) {
1085                                 $item['content-warning'] = BBCode::toPlaintext($content_warning);
1086                         }
1087                 }
1088
1089                 Post::insert($item['uri-id'], $item);
1090
1091                 if ($item['gravity'] == GRAVITY_PARENT) {
1092                         Post\Thread::insert($item['uri-id'], $item);
1093                 }
1094
1095                 if (!in_array($item['verb'], self::ACTIVITIES)) {
1096                         Post\Content::insert($item['uri-id'], $item);
1097                 }
1098
1099                 // Create Diaspora signature
1100                 if ($item['origin'] && empty($item['diaspora_signed_text']) && ($item['gravity'] != GRAVITY_PARENT)) {
1101                         $signed = Diaspora::createCommentSignature($item);
1102                         if (!empty($signed)) {
1103                                 $item['diaspora_signed_text'] = json_encode($signed);
1104                         }
1105                 }
1106
1107                 if (!empty($item['diaspora_signed_text'])) {
1108                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
1109                 }
1110
1111                 // Attached file links
1112                 if (!empty($item['file'])) {
1113                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1114                 }
1115
1116                 // Delivery relevant data
1117                 $delivery_data = Post\DeliveryData::extractFields($item);
1118
1119                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1120                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1121                 }
1122
1123                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1124                 if (!Tag::existsForPost($item['uri-id'])) {
1125                         Tag::storeFromBody($item['uri-id'], $item['body']);
1126                 }
1127
1128                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid']];
1129                 if (Post::exists($condition)) {
1130                         Logger::notice('Item is already inserted - aborting', $condition);
1131                         return 0;
1132                 }
1133
1134                 $post_user_id = Post\User::insert($item['uri-id'], $item['uid'], $item);
1135                 if (!$post_user_id) {
1136                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1137                         return 0;
1138                 }
1139
1140                 if ($item['gravity'] == GRAVITY_PARENT) {
1141                         $item['post-user-id'] = $post_user_id;
1142                         Post\ThreadUser::insert($item['uri-id'], $item['uid'], $item);
1143                 }
1144
1145                 Logger::notice('created item', ['post-id' => $post_user_id, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1146
1147                 $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['post-user-id' => $post_user_id]);
1148                 if (!DBA::isResult($posted_item)) {
1149                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1150                         Logger::warning('Could not store item. it will be spooled', ['id' => $post_user_id]);
1151                         self::spool($orig_item);
1152                         return 0;
1153                 }
1154
1155                 // update the commented timestamp on the parent
1156                 if (DI::config()->get('system', 'like_no_comment')) {
1157                         // Update when it is a comment
1158                         $update_commented = in_array($posted_item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1159                 } else {
1160                         // Update when it isn't a follow or tag verb
1161                         $update_commented = !in_array($posted_item['verb'], [Activity::FOLLOW, Activity::TAG]);
1162                 }
1163
1164                 if ($update_commented) {
1165                         $fields = ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
1166                 } else {
1167                         $fields = ['changed' => DateTimeFormat::utcNow()];
1168                 }
1169
1170                 Post::update($fields, ['uri-id' => $posted_item['parent-uri-id'], 'uid' => $posted_item['uid']]);
1171
1172                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1173                 if (self::tagDeliver($posted_item['uid'], $post_user_id)) {
1174                         // Get the user information for the logging
1175                         $user = User::getById($uid);
1176
1177                         Logger::notice('Item had been deleted', ['id' => $post_user_id, 'user' => $uid, 'account-type' => $user['account-type']]);
1178                         return 0;
1179                 }
1180
1181                 if ($notify) {
1182                         if (!\Friendica\Content\Feature::isEnabled($posted_item['uid'], 'explicit_mentions') && ($posted_item['gravity'] == GRAVITY_COMMENT)) {
1183                                 Tag::createImplicitMentions($posted_item['uri-id'], $posted_item['thr-parent-id']);
1184                         }
1185                         Hook::callAll('post_local_end', $posted_item);
1186                 } else {
1187                         Hook::callAll('post_remote_end', $posted_item);
1188                 }
1189
1190                 if ($posted_item['gravity'] === GRAVITY_PARENT) {
1191                         self::addShadow($post_user_id);
1192                 } else {
1193                         self::addShadowPost($post_user_id);
1194                 }
1195
1196                 self::updateContact($posted_item);
1197
1198                 Post\UserNotification::setNotification($posted_item['uri-id'], $posted_item['uid']);
1199
1200                 // Distribute items to users who subscribed to their tags
1201                 self::distributeByTags($posted_item);
1202
1203                 // Automatically reshare the item if the "remote_self" option is selected
1204                 self::autoReshare($posted_item);
1205
1206                 $transmit = $notify || ($posted_item['visible'] && ($parent_origin || $posted_item['origin']));
1207
1208                 if ($transmit) {
1209                         // Don't relay participation messages
1210                         if (($posted_item['verb'] == Activity::FOLLOW) &&
1211                                 (!$posted_item['origin'] || ($posted_item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1212                                 Logger::info('Participation messages will not be relayed', ['item' => $posted_item['id'], 'uri' => $posted_item['uri'], 'verb' => $posted_item['verb']]);
1213                                 $transmit = false;
1214                         }
1215                 }
1216
1217                 if ($transmit) {
1218                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, (int)$posted_item['uri-id'], (int)$posted_item['uid']);
1219                 }
1220
1221                 // Fill the cache with the rendered content.
1222                 if (in_array($posted_item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) && ($posted_item['uid'] == 0)) {
1223                         self::updateDisplayCache($posted_item['uri-id']);
1224                 }
1225
1226                 if ($posted_item['origin'] && ($posted_item['uid'] != 0) && in_array($posted_item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT])) {
1227                         DI::cache()->delete(ActivityPub\Transmitter::CACHEKEY_OUTBOX . $posted_item['uid']);
1228                 }
1229
1230                 return $post_user_id;
1231         }
1232
1233         /**
1234          * Update the display cache
1235          *
1236          * @param integer $uri_id
1237          * @return void
1238          */
1239         public static function updateDisplayCache(int $uri_id)
1240         {
1241                 $item = Post::selectFirst(self::DISPLAY_FIELDLIST, ['uri-id' => $uri_id]);
1242                 self::prepareBody($item, false, false, true);
1243         }
1244
1245         /**
1246          * Change the owner of a parent item if it had been shared by a forum
1247          *
1248          * (public) forum posts in the new format consist of the regular post by the author
1249          * followed by an announce message sent from the forum account.
1250          * Changing the owner helps in grouping forum posts.
1251          *
1252          * @param array $item
1253          * @return void
1254          */
1255         private static function setOwnerforResharedItem(array $item)
1256         {
1257                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-reason'],
1258                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1259                 if (!DBA::isResult($parent)) {
1260                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1261                         return;
1262                 }
1263
1264                 $author = Contact::selectFirst(['url', 'contact-type', 'network'], ['id' => $item['author-id']]);
1265                 if (!DBA::isResult($author)) {
1266                         Logger::error('Author not found', ['id' => $item['author-id']]);
1267                         return;
1268                 }
1269
1270                 $self_contact = Contact::selectFirst(['id'], ['uid' => $item['uid'], 'self' => true]);
1271                 $self = !empty($self_contact) ? $self_contact['id'] : 0;
1272
1273                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1274                 if (empty($cid) || (!Contact::isSharing($cid, $item['uid']) && ($cid != $self))) {
1275                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid'], 'cid' => $cid]);
1276                         return;
1277                 }
1278
1279                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1280                         if ($parent['post-reason'] == self::PR_ANNOUNCEMENT) {
1281                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1282                                 return;
1283                         }
1284
1285                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1286                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1287                                 return;
1288                         }
1289                 }
1290
1291                 self::update(['post-reason' => self::PR_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1292                 Logger::info('Set announcement post-reason', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1293         }
1294
1295         /**
1296          * Distribute the given item to users who subscribed to their tags
1297          *
1298          * @param array $item     Processed item
1299          */
1300         private static function distributeByTags(array $item)
1301         {
1302                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1303                         return;
1304                 }
1305
1306                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1307                 foreach ($uids as $uid) {
1308                         if (Contact::isSharing($item['author-id'], $uid)) {
1309                                 $fields = [];
1310                         } else {
1311                                 $fields = ['post-reason' => self::PR_TAG];
1312                         }
1313
1314                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1315                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1316                 }
1317         }
1318
1319         /**
1320          * Distributes public items to the receivers
1321          *
1322          * @param integer $itemid      Item ID that should be added
1323          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1324          * @throws \Exception
1325          */
1326         public static function distribute(int $itemid, string $signed_text = '')
1327         {
1328                 $condition = ["`id` IN (SELECT `parent` FROM `post-user-view` WHERE `id` = ?)", $itemid];
1329                 $parent = Post::selectFirst(['owner-id'], $condition);
1330                 if (!DBA::isResult($parent)) {
1331                         Logger::warning('Item not found', ['condition' => $condition]);
1332                         return;
1333                 }
1334
1335                 // Only distribute public items from native networks
1336                 $condition = ['id' => $itemid, 'uid' => 0,
1337                         'network' => array_merge(Protocol::FEDERATED ,['']),
1338                         'visible' => true, 'deleted' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1339                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1340                 if (!DBA::isResult($item)) {
1341                         Logger::warning('Item not found', ['condition' => $condition]);
1342                         return;
1343                 }
1344
1345                 $origin = $item['origin'];
1346
1347                 $users = [];
1348
1349                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1350                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1351                 if (!DBA::isResult($owner)) {
1352                         return;
1353                 }
1354
1355                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1356                 $contacts = DBA::select('contact', ['uid'], $condition);
1357                 while ($contact = DBA::fetch($contacts)) {
1358                         if ($contact['uid'] == 0) {
1359                                 continue;
1360                         }
1361
1362                         $users[$contact['uid']] = $contact['uid'];
1363                 }
1364                 DBA::close($contacts);
1365
1366                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1367                 $contacts = DBA::select('contact', ['uid'], $condition);
1368                 while ($contact = DBA::fetch($contacts)) {
1369                         if ($contact['uid'] == 0) {
1370                                 continue;
1371                         }
1372
1373                         $users[$contact['uid']] = $contact['uid'];
1374                 }
1375                 DBA::close($contacts);
1376
1377                 if (!empty($owner['alias'])) {
1378                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1379                         $contacts = DBA::select('contact', ['uid'], $condition);
1380                         while ($contact = DBA::fetch($contacts)) {
1381                                 if ($contact['uid'] == 0) {
1382                                         continue;
1383                                 }
1384
1385                                 $users[$contact['uid']] = $contact['uid'];
1386                         }
1387                         DBA::close($contacts);
1388                 }
1389
1390                 $origin_uid = 0;
1391
1392                 if ($item['uri-id'] != $item['parent-uri-id']) {
1393                         $parents = Post::select(['uid', 'origin'], ["`uri-id` = ? AND `uid` != 0", $item['parent-uri-id']]);
1394                         while ($parent = Post::fetch($parents)) {
1395                                 $users[$parent['uid']] = $parent['uid'];
1396                                 if ($parent['origin'] && !$origin) {
1397                                         $origin_uid = $parent['uid'];
1398                                 }
1399                         }
1400                         DBA::close($parents);
1401                 }
1402
1403                 foreach ($users as $uid) {
1404                         if ($origin_uid == $uid) {
1405                                 $item['diaspora_signed_text'] = $signed_text;
1406                         }
1407                         self::storeForUser($item, $uid);
1408                 }
1409         }
1410
1411         /**
1412          * Store a public item defined by their URI-ID for the given users
1413          *
1414          * @param integer $uri_id     URI-ID of the given item
1415          * @param integer $uid        The user that will receive the item entry
1416          * @param array   $fields     Additional fields to be stored
1417          * @param integer $source_uid User id of the source post
1418          * @return integer stored item id
1419          */
1420         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [], int $source_uid = 0): int
1421         {
1422                 if ($uid == $source_uid) {
1423                         Logger::warning('target UID must not be be equal to the source UID', ['uri-id' => $uri_id, 'uid' => $uid]);
1424                         return 0;
1425                 }
1426
1427                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => $source_uid]);
1428                 if (!DBA::isResult($item)) {
1429                         Logger::warning('Item could not be fetched', ['uri-id' => $uri_id, 'uid' => $source_uid]);
1430                         return 0;
1431                 }
1432
1433                 if (($source_uid == 0) && (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED))) {
1434                         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']]);
1435                         return 0;
1436                 }
1437
1438                 $item['post-reason'] = self::PR_STORED;
1439
1440                 $item = array_merge($item, $fields);
1441
1442                 $is_reshare = ($item['gravity'] == GRAVITY_ACTIVITY) && ($item['verb'] == Activity::ANNOUNCE);
1443
1444                 if ((($item['gravity'] == GRAVITY_PARENT) || $is_reshare) &&
1445                         DI::pConfig()->get($uid, 'system', 'accept_only_sharer') == self::COMPLETION_NONE &&
1446                         !Contact::isSharingByURL($item['author-link'], $uid) &&
1447                         !Contact::isSharingByURL($item['owner-link'], $uid)) {
1448                         Logger::info('Contact is not a follower, thread will not be stored', ['author' => $item['author-link'], 'uid' => $uid]);
1449                         return 0;
1450                 }
1451
1452                 if (($uri_id != $item['thr-parent-id']) && (($item['gravity'] == GRAVITY_COMMENT) || $is_reshare) && !Post::exists(['uri-id' => $item['thr-parent-id'], 'uid' => $uid])) {
1453                         // Fetch the origin user for the post
1454                         $origin_uid = self::GetOriginUidForUriId($item['thr-parent-id'], $uid);
1455                         if (is_null($origin_uid)) {
1456                                 Logger::info('Origin item was not found', ['uid' => $uid, 'uri-id' => $item['thr-parent-id']]);
1457                                 return 0;
1458                         }
1459
1460                         $causer = $item['causer-id'] ?: $item['author-id'];
1461                         $result = self::storeForUserByUriId($item['thr-parent-id'], $uid, ['causer-id' => $causer, 'post-reason' => self::PR_FETCHED], $origin_uid);
1462                         Logger::info('Fetched thread parent', ['uri-id' => $item['thr-parent-id'], 'uid' => $uid, 'causer' => $causer, 'result' => $result]);
1463                 }
1464
1465                 $stored = self::storeForUser($item, $uid);
1466                 Logger::info('Item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'source-uid' => $source_uid, 'stored' => $stored]);
1467                 return $stored;
1468         }
1469
1470         /**
1471          * Returns the origin uid of a post if the given user is allowed to see it.
1472          *
1473          * @param int $uriid
1474          * @param int $uid
1475          * @return int
1476          */
1477         private static function GetOriginUidForUriId(int $uriid, int $uid)
1478         {
1479                 if (Post::exists(['uri-id' => $uriid, 'uid' => $uid])) {
1480                         return $uid;
1481                 }
1482
1483                 $post = Post::selectFirst(['uid', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'private'], ['uri-id' => $uriid, 'origin' => true]);
1484                 if (!empty($post)) {
1485                         if (in_array($post['private'], [Item::PUBLIC, Item::UNLISTED])) {
1486                                 return $post['uid'];
1487                         }
1488
1489                         $pcid = Contact::getPublicIdByUserId($uid);
1490                         if (empty($pcid)) {
1491                                 return null;
1492                         }
1493
1494                         foreach (Item::enumeratePermissions($post, true) as $receiver) {
1495                                 if ($receiver == $pcid) {
1496                                         return $post['uid'];
1497                                 }
1498                         }
1499
1500                         return null;
1501                 }
1502
1503                 if (Post::exists(['uri-id' => $uriid, 'uid' => 0])) {
1504                         return 0;
1505                 }
1506
1507                 // When the post belongs to a a forum then all forum users are allowed to access it
1508                 foreach (Tag::getByURIId($uriid, [Tag::MENTION, Tag::EXCLUSIVE_MENTION]) as $tag) {
1509                         if (DBA::exists('contact', ['uid' => $uid, 'nurl' => Strings::normaliseLink($tag['url']), 'contact-type' => Contact::TYPE_COMMUNITY])) {
1510                                 $target_uid = User::getIdForURL($tag['url']);
1511                                 if (!empty($target_uid)) {
1512                                         return $target_uid;
1513                                 }
1514                         }
1515                 }
1516
1517                 return null;
1518         }
1519
1520         /**
1521          * Store a public item array for the given users
1522          *
1523          * @param array   $item   The item entry that will be stored
1524          * @param integer $uid    The user that will receive the item entry
1525          * @return integer stored item id
1526          * @throws \Exception
1527          */
1528         private static function storeForUser(array $item, int $uid): int
1529         {
1530                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1531                         if (!empty($item['event-id'])) {
1532                                 $post = Post::selectFirst(['event-id'], ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1533                                 if (!empty($post['event-id'])) {
1534                                         $event = DBA::selectFirst('event', ['edited', 'start', 'finish', 'summary', 'desc', 'location', 'nofinish', 'adjust'], ['id' => $item['event-id']]);
1535                                         if (!empty($event)) {
1536                                                 // We aren't using "Event::store" here, since we don't want to trigger any further action
1537                                                 $ret = DBA::update('event', $event, ['id' => $post['event-id']]);
1538                                                 Logger::info('Event updated', ['uid' => $uid, 'source-event' => $item['event-id'], 'target-event' => $post['event-id'], 'ret' => $ret]);
1539                                         }
1540                                 }
1541                         }
1542                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1543                         return 0;
1544                 }
1545
1546                 // Data from the "post-user" table
1547                 unset($item['id']);
1548                 unset($item['mention']);
1549                 unset($item['starred']);
1550                 unset($item['unseen']);
1551                 unset($item['psid']);
1552                 unset($item['pinned']);
1553                 unset($item['ignored']);
1554                 unset($item['pubmail']);
1555                 unset($item['event-id']);
1556                 unset($item['hidden']);
1557                 unset($item['notification-type']);
1558                 unset($item['post-reason']);
1559
1560                 // Data from the "post-delivery-data" table
1561                 unset($item['postopts']);
1562                 unset($item['inform']);
1563
1564                 $item['uid'] = $uid;
1565                 $item['origin'] = 0;
1566                 $item['wall'] = 0;
1567
1568                 if ($item['gravity'] == GRAVITY_PARENT) {
1569                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1570                 } else {
1571                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1572                 }
1573
1574                 if (!empty($contact['id'])) {
1575                         $item['contact-id'] = $contact['id'];
1576                 } else {
1577                         // Shouldn't happen at all
1578                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1579                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1580                         if (!DBA::isResult($self)) {
1581                                 // Shouldn't happen even less
1582                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1583                                 return 0;
1584                         }
1585                         $item['contact-id'] = $self['id'];
1586                 }
1587
1588                 $notify = false;
1589                 if ($item['gravity'] == GRAVITY_PARENT) {
1590                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1591                         if (DBA::isResult($contact)) {
1592                                 $notify = self::isRemoteSelf($contact, $item);
1593                         }
1594                 }
1595
1596                 $distributed = self::insert($item, $notify);
1597
1598                 if (!$distributed) {
1599                         Logger::info("Distributed item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1600                 } else {
1601                         Logger::info('Distributed item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1602                 }
1603                 return $distributed;
1604         }
1605
1606         /**
1607          * Add a shadow entry for a given item id that is a thread starter
1608          *
1609          * We store every public item entry additionally with the user id "0".
1610          * This is used for the community page and for the search.
1611          * It is planned that in the future we will store public item entries only once.
1612          *
1613          * @param integer $itemid Item ID that should be added
1614          * @throws \Exception
1615          */
1616         private static function addShadow(int $itemid)
1617         {
1618                 $fields = ['uid', 'private', 'visible', 'deleted', 'network', 'uri-id'];
1619                 $condition = ['id' => $itemid, 'gravity' => GRAVITY_PARENT];
1620                 $item = Post::selectFirst($fields, $condition);
1621
1622                 if (!DBA::isResult($item)) {
1623                         return;
1624                 }
1625
1626                 // is it already a copy?
1627                 if (($itemid == 0) || ($item['uid'] == 0)) {
1628                         return;
1629                 }
1630
1631                 // Is it a visible public post?
1632                 if (!$item["visible"] || $item["deleted"]  || ($item["private"] == self::PRIVATE)) {
1633                         return;
1634                 }
1635
1636                 // is it an entry from a connector? Only add an entry for natively connected networks
1637                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1638                         return;
1639                 }
1640
1641                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1642                         return;
1643                 }
1644
1645                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1646
1647                 if (DBA::isResult($item)) {
1648                         // Preparing public shadow (removing user specific data)
1649                         $item['uid'] = 0;
1650                         unset($item['id']);
1651                         unset($item['parent']);
1652                         unset($item['wall']);
1653                         unset($item['mention']);
1654                         unset($item['origin']);
1655                         unset($item['starred']);
1656                         unset($item['postopts']);
1657                         unset($item['inform']);
1658                         unset($item['post-reason']);
1659                         if ($item['uri-id'] == $item['parent-uri-id']) {
1660                                 $item['contact-id'] = $item['owner-id'];
1661                         } else {
1662                                 $item['contact-id'] = $item['author-id'];
1663                         }
1664
1665                         $public_shadow = self::insert($item);
1666
1667                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1668                 }
1669         }
1670
1671         /**
1672          * Add a shadow entry for a given item id that is a comment
1673          *
1674          * This function does the same like the function above - but for comments
1675          *
1676          * @param integer $itemid Item ID that should be added
1677          * @throws \Exception
1678          */
1679         private static function addShadowPost(int $itemid)
1680         {
1681                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1682                 if (!DBA::isResult($item)) {
1683                         return;
1684                 }
1685
1686                 // Is it a toplevel post?
1687                 if ($item['gravity'] == GRAVITY_PARENT) {
1688                         self::addShadow($itemid);
1689                         return;
1690                 }
1691
1692                 // Is this a shadow entry?
1693                 if ($item['uid'] == 0) {
1694                         return;
1695                 }
1696
1697                 // Is there a shadow parent?
1698                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
1699                         return;
1700                 }
1701
1702                 // Is there already a shadow entry?
1703                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1704                         return;
1705                 }
1706
1707                 // Save "origin" and "parent" state
1708                 $origin = $item['origin'];
1709                 $parent = $item['parent'];
1710
1711                 // Preparing public shadow (removing user specific data)
1712                 $item['uid'] = 0;
1713                 unset($item['id']);
1714                 unset($item['parent']);
1715                 unset($item['wall']);
1716                 unset($item['mention']);
1717                 unset($item['origin']);
1718                 unset($item['starred']);
1719                 unset($item['postopts']);
1720                 unset($item['inform']);
1721                 unset($item['post-reason']);
1722                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1723
1724                 $public_shadow = self::insert($item);
1725
1726                 Logger::info('Stored public shadow', ['uri-id' => $item['uri-id'], 'id' => $public_shadow]);
1727
1728                 // If this was a comment to a Diaspora post we don't get our comment back.
1729                 // This means that we have to distribute the comment by ourselves.
1730                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1731                         self::distribute($public_shadow);
1732                 }
1733         }
1734
1735         /**
1736          * Adds a language specification in a "language" element of given $arr.
1737          * Expects "body" element to exist in $arr.
1738          *
1739          * @param array $item
1740          * @return string detected language
1741          * @throws \Text_LanguageDetect_Exception
1742          */
1743         private static function getLanguage(array $item): string
1744         {
1745                 if (!empty($item['language'])) {
1746                         return $item['language'];
1747                 }
1748
1749                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1750                         return '';
1751                 }
1752
1753                 // Convert attachments to links
1754                 $naked_body = BBCode::removeAttachment($item['body']);
1755                 if (empty($naked_body)) {
1756                         return '';
1757                 }
1758
1759                 // Remove links and pictures
1760                 $naked_body = BBCode::removeLinks($naked_body);
1761
1762                 // Convert the title and the body to plain text
1763                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1764
1765                 // Remove possibly remaining links
1766                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1767
1768                 if (empty($naked_body)) {
1769                         return '';
1770                 }
1771
1772                 $availableLanguages = DI::l10n()->getAvailableLanguages();
1773                 // See https://github.com/friendica/friendica/issues/10511
1774                 // Persian is manually added to language detection until a persian translation is provided for the interface, at
1775                 // which point it will be automatically available through `getAvailableLanguages()` and this should be removed.
1776                 $availableLanguages['fa'] = 'fa';
1777
1778                 $ld = new Language(array_keys($availableLanguages));
1779                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1780                 if (is_array($languages)) {
1781                         return json_encode($languages);
1782                 }
1783
1784                 return '';
1785         }
1786
1787         public static function getLanguageMessage(array $item): string
1788         {
1789                 $iso639 = new \Matriphe\ISO639\ISO639;
1790
1791                 $used_languages = '';
1792                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1793                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1794                 }
1795                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1796                 return $used_languages;
1797         }
1798
1799         /**
1800          * Creates an unique guid out of a given uri.
1801          * This function is used for messages outside the fediverse (Connector posts, feeds, Mails, ...)
1802          * Posts that are created on this system are using System::createUUID.
1803          * Received ActivityPub posts are using Processor::getGUIDByURL.
1804          *
1805          * @param string $uri uri of an item entry
1806          * @param string $host hostname for the GUID prefix
1807          * @return string unique guid
1808          */
1809         public static function guidFromUri(string $uri, string $host): string
1810         {
1811                 // Our regular guid routine is using this kind of prefix as well
1812                 // We have to avoid that different routines could accidentally create the same value
1813                 $parsed = parse_url($uri);
1814
1815                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1816                 unset($parsed["scheme"]);
1817
1818                 // Glue it together to be able to make a hash from it
1819                 $host_id = implode("/", $parsed);
1820
1821                 // Use a mixture of several hashes to provide some GUID like experience
1822                 return hash("crc32", $host) . '-'. hash('joaat', $host_id) . '-'. hash('fnv164', $host_id);
1823         }
1824
1825         /**
1826          * generate an unique URI
1827          *
1828          * @param integer $uid  User id
1829          * @param string  $guid An existing GUID (Otherwise it will be generated)
1830          *
1831          * @return string
1832          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1833          */
1834         public static function newURI($uid, $guid = "")
1835         {
1836                 if ($guid == "") {
1837                         $guid = System::createUUID();
1838                 }
1839
1840                 return DI::baseUrl()->get() . '/objects/' . $guid;
1841         }
1842
1843         /**
1844          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1845          *
1846          * This can be used to filter for inactive contacts.
1847          * Only do this for public postings to avoid privacy problems, since poco data is public.
1848          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1849          *
1850          * @param array $arr Contains the just posted item record
1851          * @throws \Exception
1852          */
1853         private static function updateContact(array $arr)
1854         {
1855                 // Unarchive the author
1856                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1857                 if (DBA::isResult($contact)) {
1858                         Contact::unmarkForArchival($contact);
1859                 }
1860
1861                 // Unarchive the contact if it's not our own contact
1862                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1863                 if (DBA::isResult($contact)) {
1864                         Contact::unmarkForArchival($contact);
1865                 }
1866
1867                 /// @todo On private posts we could obfuscate the date
1868                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1869
1870                 // Is it a forum? Then we don't care about the rules from above
1871                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri-id"] === $arr["uri-id"])) {
1872                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1873                                 $update = true;
1874                         }
1875                 }
1876
1877                 if ($update) {
1878                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1879                         // So we have to ensure to only update the last item when it had been our own post,
1880                         // or it had been done by a "regular" contact.
1881                         if (!empty($arr['wall'])) {
1882                                 $condition = ['id' => $arr['contact-id']];
1883                         } else {
1884                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1885                         }
1886                         Contact::update(['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1887                 }
1888                 // Now do the same for the system wide contacts with uid=0
1889                 if ($arr['private'] != self::PRIVATE) {
1890                         Contact::update(['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1891                                 ['id' => $arr['owner-id']]);
1892
1893                         if ($arr['owner-id'] != $arr['author-id']) {
1894                                 Contact::update(['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1895                                         ['id' => $arr['author-id']]);
1896                         }
1897                 }
1898         }
1899
1900         public static function setHashtags(string $body): string
1901         {
1902                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1903                         $tags = BBCode::getTags($body);
1904
1905                         // No hashtags?
1906                         if (!count($tags)) {
1907                                 return $body;
1908                         }
1909
1910                         // This sorting is important when there are hashtags that are part of other hashtags
1911                         // Otherwise there could be problems with hashtags like #test and #test2
1912                         // Because of this we are sorting from the longest to the shortest tag.
1913                         usort($tags, function ($a, $b) {
1914                                 return strlen($b) <=> strlen($a);
1915                         });
1916
1917                         $URLSearchString = "^\[\]";
1918
1919                         // All hashtags should point to the home server if "local_tags" is activated
1920                         if (DI::config()->get('system', 'local_tags')) {
1921                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1922                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1923                         }
1924
1925                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1926                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1927                                 function ($match) {
1928                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1929                                 }, $body);
1930
1931                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1932                                 function ($match) {
1933                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1934                                 }, $body);
1935
1936                         $body = preg_replace_callback("/\[attachment (.*?)\](.*?)\[\/attachment\]/ism",
1937                                 function ($match) {
1938                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1939                                 }, $body);
1940
1941                         // Repair recursive urls
1942                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1943                                 "&num;$2", $body);
1944
1945                         foreach ($tags as $tag) {
1946                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1947                                         continue;
1948                                 }
1949
1950                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1951                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1952
1953                                 $body = str_replace($tag, $newtag, $body);
1954                         }
1955
1956                         // Convert back the masked hashtags
1957                         $body = str_replace("&num;", "#", $body);
1958
1959                         return $body;
1960                 });
1961
1962                 return $body;
1963         }
1964
1965         /**
1966          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1967          *
1968          * @param int $uid
1969          * @param int $item_id
1970          * @return boolean true if item was deleted, else false
1971          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1972          * @throws \ImagickException
1973          */
1974         private static function tagDeliver(int $uid, int $item_id): bool
1975         {
1976                 $mention = false;
1977
1978                 $owner = User::getOwnerDataById($uid);
1979                 if (!DBA::isResult($owner)) {
1980                         Logger::warning('User not found, quitting here.', ['uid' => $uid]);
1981                         return false;
1982                 }
1983
1984                 if ($owner['contact-type'] != User::ACCOUNT_TYPE_COMMUNITY) {
1985                         Logger::debug('Owner is no community, quitting here.', ['uid' => $uid, 'id' => $item_id]);
1986                         return false;
1987                 }
1988
1989                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT], 'origin' => false]);
1990                 if (!DBA::isResult($item)) {
1991                         Logger::debug('Post is an activity or origin or not found at all, quitting here.', ['id' => $item_id]);
1992                         return false;
1993                 }
1994
1995                 if ($item['gravity'] == GRAVITY_PARENT) {
1996                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1997                         foreach ($tags as $tag) {
1998                                 if (Strings::compareLink($owner['url'], $tag['url'])) {
1999                                         $mention = true;
2000                                         Logger::info('Mention found in tag.', ['url' => $tag['url'], 'uri' => $item['uri'], 'uid' => $uid, 'id' => $item_id, 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
2001                                 }
2002                         }
2003
2004                         if (!$mention) {
2005                                 Logger::info('Top-level post without mention is deleted.', ['uri' => $item['uri'], $uid, 'id' => $item_id, 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
2006                                 Post\User::delete(['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
2007                                 return true;
2008                         }
2009
2010                         $arr = ['item' => $item, 'user' => $owner];
2011
2012                         Hook::callAll('tagged', $arr);
2013                 } else {
2014                         $tags = Tag::getByURIId($item['parent-uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
2015                         foreach ($tags as $tag) {
2016                                 if (Strings::compareLink($owner['url'], $tag['url'])) {
2017                                         $mention = true;
2018                                         Logger::info('Mention found in parent tag.', ['url' => $tag['url'], 'uri' => $item['uri'], 'uid' => $uid, 'id' => $item_id, 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
2019                                 }
2020                         }
2021
2022                         if (!$mention) {
2023                                 Logger::debug('No mentions found in parent, quitting here.', ['id' => $item_id, 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
2024                                 return false;
2025                         }
2026                 }
2027
2028                 Logger::info('Community post will be distributed', ['uri' => $item['uri'], 'uid' => $uid, 'id' => $item_id, 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
2029
2030                 if ($owner['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
2031                         $allow_cid = '';
2032                         $allow_gid = '<' . Group::FOLLOWERS . '>';
2033                         $deny_cid  = '';
2034                         $deny_gid  = '';
2035                         self::performActivity($item['id'], 'announce', $uid, $allow_cid, $allow_gid, $deny_cid, $deny_gid);
2036                 } else {
2037                         self::performActivity($item['id'], 'announce', $uid);
2038                 }
2039
2040                 Logger::info('Community post had been distributed', ['uri' => $item['uri'], 'uid' => $uid, 'id' => $item_id, 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
2041                 return false;
2042         }
2043
2044         /**
2045          * Automatically reshare the item if the "remote_self" option is selected
2046          *
2047          * @param array $item
2048          * @return void
2049          */
2050         private static function autoReshare(array $item)
2051         {
2052                 if ($item['gravity'] != GRAVITY_PARENT) {
2053                         return;
2054                 }
2055
2056                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
2057                         return;
2058                 }
2059
2060                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
2061                         return;
2062                 }
2063
2064                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
2065
2066                 self::performActivity($item['id'], 'announce', $item['uid']);
2067         }
2068
2069         public static function isRemoteSelf(array $contact, array &$datarray): bool
2070         {
2071                 if (!$contact['remote_self']) {
2072                         return false;
2073                 }
2074
2075                 // Prevent the forwarding of posts that are forwarded
2076                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2077                         Logger::info('Already forwarded');
2078                         return false;
2079                 }
2080
2081                 // Prevent to forward already forwarded posts
2082                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
2083                         Logger::info('Already forwarded (second test)');
2084                         return false;
2085                 }
2086
2087                 // Only forward posts
2088                 if ($datarray["verb"] != Activity::POST) {
2089                         Logger::info('No post');
2090                         return false;
2091                 }
2092
2093                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
2094                         Logger::info('Not public');
2095                         return false;
2096                 }
2097
2098                 $datarray2 = $datarray;
2099                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
2100                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
2101                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2102                                         ['uid' => $contact['uid'], 'self' => true]);
2103                         if (DBA::isResult($self)) {
2104                                 $datarray['contact-id'] = $self["id"];
2105
2106                                 $datarray['owner-name'] = $self["name"];
2107                                 $datarray['owner-link'] = $self["url"];
2108                                 $datarray['owner-avatar'] = $self["thumb"];
2109
2110                                 $datarray['author-name']   = $datarray['owner-name'];
2111                                 $datarray['author-link']   = $datarray['owner-link'];
2112                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2113
2114                                 unset($datarray['edited']);
2115
2116                                 unset($datarray['network']);
2117                                 unset($datarray['owner-id']);
2118                                 unset($datarray['author-id']);
2119                         }
2120
2121                         if ($contact['network'] != Protocol::FEED) {
2122                                 $old_uri_id = $datarray["uri-id"] ?? 0;
2123                                 $datarray["guid"] = System::createUUID();
2124                                 unset($datarray["plink"]);
2125                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2126                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
2127                                 $datarray["extid"] = Protocol::DFRN;
2128                                 $urlpart = parse_url($datarray2['author-link']);
2129                                 $datarray["app"] = $urlpart["host"];
2130                                 if (!empty($old_uri_id)) {
2131                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
2132                                 }
2133
2134                                 unset($datarray["parent-uri"]);
2135                                 unset($datarray["thr-parent"]);
2136                         } else {
2137                                 $datarray['private'] = self::PUBLIC;
2138                         }
2139                 }
2140
2141                 if ($contact['network'] != Protocol::FEED) {
2142                         // Store the original post
2143                         $result = self::insert($datarray2);
2144                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
2145                 } else {
2146                         $datarray["app"] = "Feed";
2147                         $result = true;
2148                 }
2149
2150                 return (bool)$result;
2151         }
2152
2153         /**
2154          *
2155          * @param string $s
2156          * @param int    $uid
2157          * @param array  $item
2158          * @param int    $cid
2159          * @return string
2160          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2161          * @throws \ImagickException
2162          */
2163         public static function fixPrivatePhotos(string $s, int $uid, array $item = null, int $cid = 0): string
2164         {
2165                 if (DI::config()->get('system', 'disable_embedded')) {
2166                         return $s;
2167                 }
2168
2169                 Logger::info('check for photos');
2170                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
2171
2172                 $orig_body = $s;
2173                 $new_body = '';
2174
2175                 $img_start = strpos($orig_body, '[img');
2176                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2177                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2178
2179                 while (($img_st_close !== false) && ($img_len !== false)) {
2180                         $img_st_close++; // make it point to AFTER the closing bracket
2181                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2182
2183                         Logger::info('found photo', ['image' => $image]);
2184
2185                         if (stristr($image, $site . '/photo/')) {
2186                                 // Only embed locally hosted photos
2187                                 $replace = false;
2188                                 $i = basename($image);
2189                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2190                                 $x = strpos($i, '-');
2191
2192                                 if ($x) {
2193                                         $res = substr($i, $x + 1);
2194                                         $i = substr($i, 0, $x);
2195                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2196                                         if (DBA::isResult($photo)) {
2197                                                 /*
2198                                                  * Check to see if we should replace this photo link with an embedded image
2199                                                  * 1. No need to do so if the photo is public
2200                                                  * 2. If there's a contact-id provided, see if they're in the access list
2201                                                  *    for the photo. If so, embed it.
2202                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2203                                                  *    permissions, regardless of order but first check to see if they're an exact
2204                                                  *    match to save some processing overhead.
2205                                                  */
2206                                                 if (self::hasPermissions($photo)) {
2207                                                         if ($cid) {
2208                                                                 $recips = self::enumeratePermissions($photo);
2209                                                                 if (in_array($cid, $recips)) {
2210                                                                         $replace = true;
2211                                                                 }
2212                                                         } elseif ($item) {
2213                                                                 if (self::samePermissions($uid, $item, $photo)) {
2214                                                                         $replace = true;
2215                                                                 }
2216                                                         }
2217                                                 }
2218                                                 if ($replace) {
2219                                                         $photo_img = Photo::getImageForPhoto($photo);
2220                                                         // If a custom width and height were specified, apply before embedding
2221                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2222                                                                 Logger::info('scaling photo');
2223
2224                                                                 $width = intval($match[1]);
2225                                                                 $height = intval($match[2]);
2226
2227                                                                 $photo_img->scaleDown(max($width, $height));
2228                                                         }
2229
2230                                                         $data = $photo_img->asString();
2231                                                         $type = $photo_img->getType();
2232
2233                                                         Logger::info('replacing photo');
2234                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2235                                                         Logger::debug('replaced', ['image' => $image]);
2236                                                 }
2237                                         }
2238                                 }
2239                         }
2240
2241                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2242                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2243                         if ($orig_body === false) {
2244                                 $orig_body = '';
2245                         }
2246
2247                         $img_start = strpos($orig_body, '[img');
2248                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2249                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2250                 }
2251
2252                 $new_body = $new_body . $orig_body;
2253
2254                 return $new_body;
2255         }
2256
2257         private static function hasPermissions(array $obj)
2258         {
2259                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2260                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2261         }
2262
2263         // @TODO $uid is unused parameter
2264         private static function samePermissions($uid, array $obj1, array $obj2): bool
2265         {
2266                 // first part is easy. Check that these are exactly the same.
2267                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2268                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2269                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2270                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2271                         return true;
2272                 }
2273
2274                 // This is harder. Parse all the permissions and compare the resulting set.
2275                 $recipients1 = self::enumeratePermissions($obj1);
2276                 $recipients2 = self::enumeratePermissions($obj2);
2277                 sort($recipients1);
2278                 sort($recipients2);
2279
2280                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2281                 return ($recipients1 == $recipients2);
2282         }
2283
2284         /**
2285          * Returns an array of contact-ids that are allowed to see this object
2286          *
2287          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2288          * @param bool  $check_dead Prunes unavailable contacts from the result
2289          * @return array
2290          * @throws \Exception
2291          */
2292         public static function enumeratePermissions(array $obj, bool $check_dead = false): array
2293         {
2294                 $aclFormater = DI::aclFormatter();
2295
2296                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2297                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2298                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2299                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2300                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2301                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2302                 $recipients   = array_diff($recipients, $deny);
2303                 return $recipients;
2304         }
2305
2306         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2307         {
2308                 if (!$uid || ($days < 1)) {
2309                         return;
2310                 }
2311
2312                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2313                         $uid, GRAVITY_PARENT];
2314
2315                 /*
2316                  * $expire_network_only = save your own wall posts
2317                  * and just expire conversations started by others
2318                  */
2319                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2320
2321                 if ($expire_network_only) {
2322                         $condition[0] .= " AND NOT `wall`";
2323                 }
2324
2325                 if ($network != "") {
2326                         $condition[0] .= " AND `network` = ?";
2327                         $condition[] = $network;
2328                 }
2329
2330                 $condition[0] .= " AND `received` < ?";
2331                 $condition[] = DateTimeFormat::utc('now - ' . $days . ' day');
2332
2333                 $items = Post::select(['resource-id', 'starred', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2334
2335                 if (!DBA::isResult($items)) {
2336                         return;
2337                 }
2338
2339                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2340
2341                 // Forcing expiring of items - but not notes and marked items
2342                 if ($force) {
2343                         $expire_items = true;
2344                 }
2345
2346                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2347                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2348                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2349
2350                 $expired = 0;
2351
2352                 $priority = DI::config()->get('system', 'expire-notify-priority');
2353
2354                 while ($item = Post::fetch($items)) {
2355                         // don't expire filed items
2356                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2357                                 continue;
2358                         }
2359
2360                         // Only expire posts, not photos and photo comments
2361
2362                         if (!$expire_photos && !empty($item['resource-id'])) {
2363                                 continue;
2364                         } elseif (!$expire_starred && intval($item['starred'])) {
2365                                 continue;
2366                         } elseif (!$expire_notes && ($item['post-type'] == self::PT_PERSONAL_NOTE)) {
2367                                 continue;
2368                         } elseif (!$expire_items && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2369                                 continue;
2370                         }
2371
2372                         self::markForDeletionById($item['id'], $priority);
2373
2374                         ++$expired;
2375                 }
2376                 DBA::close($items);
2377                 Logger::notice('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2378         }
2379
2380         public static function firstPostDate(int $uid, bool $wall = false)
2381         {
2382                 $user = User::getById($uid, ['register_date']);
2383                 if (empty($user)) {
2384                         return false;
2385                 }
2386
2387                 $condition = ["`uid` = ? AND `wall` = ? AND NOT `deleted` AND `visible` AND `received` >= ?",
2388                         $uid, $wall, $user['register_date']];
2389                 $params = ['order' => ['received' => false]];
2390                 $thread = Post::selectFirstThread(['received'], $condition, $params);
2391                 if (DBA::isResult($thread)) {
2392                         $postdate = substr(DateTimeFormat::local($thread['received']), 0, 10);
2393                         return $postdate;
2394                 }
2395                 return false;
2396         }
2397
2398         /**
2399          * add/remove activity to an item
2400          *
2401          * Toggle activities as like,dislike,attend of an item
2402          *
2403          * @param int    $item_id
2404          * @param string $verb
2405          *            Activity verb. One of
2406          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2407          *            attendno, unattendno, attendmaybe, unattendmaybe,
2408          *            announce, unannouce
2409          * @param int    $uid
2410          * @param string $allow_cid
2411          * @param string $allow_gid
2412          * @param string $deny_cid
2413          * @param string $deny_gid
2414          * @return bool
2415          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2416          * @throws \ImagickException
2417          * @hook  'post_local_end'
2418          *            array $arr
2419          *            'post_id' => ID of posted item
2420          */
2421         public static function performActivity(int $item_id, string $verb, int $uid, string $allow_cid = null, string $allow_gid = null, string $deny_cid = null, string $deny_gid = null): bool
2422         {
2423                 if (empty($uid)) {
2424                         return false;
2425                 }
2426
2427                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2428
2429                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2430                 if (!DBA::isResult($item)) {
2431                         Logger::notice('like: unknown item', ['id' => $item_id]);
2432                         return false;
2433                 }
2434
2435                 $uri_id = $item['uri-id'];
2436
2437                 if (!in_array($item['uid'], [0, $uid])) {
2438                         return false;
2439                 }
2440
2441                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2442                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2443                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2444                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2445                                 if (!DBA::isResult($item)) {
2446                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'uri-id' => $uri_id]);
2447                                         return false;
2448                                 }
2449                         }
2450                 }
2451
2452                 // Retrieves the local post owner
2453                 $owner = User::getOwnerDataById($uid);
2454                 if (empty($owner)) {
2455                         Logger::info('Empty owner for user', ['uid' => $uid]);
2456                         return false;
2457                 }
2458
2459                 // Retrieve the current logged in user's public contact
2460                 $author_id = Contact::getIdForURL($owner['url']);
2461                 if (empty($author_id)) {
2462                         Logger::info('Empty public contact');
2463                         return false;
2464                 }
2465
2466                 $activity = null;
2467                 switch ($verb) {
2468                         case 'like':
2469                         case 'unlike':
2470                                 $activity = Activity::LIKE;
2471                                 break;
2472                         case 'dislike':
2473                         case 'undislike':
2474                                 $activity = Activity::DISLIKE;
2475                                 break;
2476                         case 'attendyes':
2477                         case 'unattendyes':
2478                                 $activity = Activity::ATTEND;
2479                                 break;
2480                         case 'attendno':
2481                         case 'unattendno':
2482                                 $activity = Activity::ATTENDNO;
2483                                 break;
2484                         case 'attendmaybe':
2485                         case 'unattendmaybe':
2486                                 $activity = Activity::ATTENDMAYBE;
2487                                 break;
2488                         case 'follow':
2489                         case 'unfollow':
2490                                 $activity = Activity::FOLLOW;
2491                                 break;
2492                         case 'announce':
2493                         case 'unannounce':
2494                                 $activity = Activity::ANNOUNCE;
2495                                 break;
2496                         default:
2497                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2498                                 return false;
2499                 }
2500
2501                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2502
2503                 // Enable activity toggling instead of on/off
2504                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2505
2506                 // Look for an existing verb row
2507                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2508                 if ($event_verb_flag) {
2509                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2510
2511                         // Translate to the index based activity index
2512                         $vids = [];
2513                         foreach ($verbs as $verb) {
2514                                 $vids[] = Verb::getID($verb);
2515                         }
2516                 } else {
2517                         $vids = Verb::getID($activity);
2518                 }
2519
2520                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2521                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent-id' => $uri_id];
2522                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2523
2524                 if (DBA::isResult($like_item)) {
2525                         /**
2526                          * Truth table for existing activities
2527                          *
2528                          * |          Inputs            ||      Outputs      |
2529                          * |----------------------------||-------------------|
2530                          * |  Mode  | Event | Same verb || Delete? | Return? |
2531                          * |--------|-------|-----------||---------|---------|
2532                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2533                          * | create |  Yes  |    No     ||   Yes   |   No    |
2534                          * | create |  No   |    Yes    ||   No    |   Yes   |
2535                          * | create |  No   |    No     ||        N/A†       |
2536                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2537                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2538                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2539                          * | delete |  No   |    No     ||        N/A†       |
2540                          * |--------|-------|-----------||---------|---------|
2541                          * |   A    |   B   |     C     || A xor C | !B or C |
2542                          *
2543                          * † Can't happen: It's impossible to find an existing non-event activity without
2544                          *                 the same verb because we are only looking for this single verb.
2545                          *
2546                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2547                          */
2548                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2549                                 self::markForDeletionById($like_item['id']);
2550                         }
2551
2552                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2553                                 return true;
2554                         }
2555                 }
2556
2557                 // No need to go further if we aren't creating anything
2558                 if ($mode == 'delete') {
2559                         return true;
2560                 }
2561
2562                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2563
2564                 $new_item = [
2565                         'guid'          => System::createUUID(),
2566                         'uri'           => self::newURI($item['uid']),
2567                         'uid'           => $item['uid'],
2568                         'contact-id'    => $owner['id'],
2569                         'wall'          => $item['wall'],
2570                         'origin'        => 1,
2571                         'network'       => Protocol::DFRN,
2572                         'protocol'      => Conversation::PARCEL_DIRECT,
2573                         'direction'     => Conversation::PUSH,
2574                         'gravity'       => GRAVITY_ACTIVITY,
2575                         'parent'        => $item['id'],
2576                         'thr-parent'    => $item['uri'],
2577                         'owner-id'      => $author_id,
2578                         'author-id'     => $author_id,
2579                         'body'          => $activity,
2580                         'verb'          => $activity,
2581                         'object-type'   => $objtype,
2582                         'allow_cid'     => $allow_cid ?? $item['allow_cid'],
2583                         'allow_gid'     => $allow_gid ?? $item['allow_gid'],
2584                         'deny_cid'      => $deny_cid ?? $item['deny_cid'],
2585                         'deny_gid'      => $deny_gid ?? $item['deny_gid'],
2586                         'visible'       => 1,
2587                         'unseen'        => 1,
2588                 ];
2589
2590                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2591                 if (!empty($signed)) {
2592                         $new_item['diaspora_signed_text'] = json_encode($signed);
2593                 }
2594
2595                 $new_item_id = self::insert($new_item);
2596
2597                 // If the parent item isn't visible then set it to visible
2598                 if (!$item['visible']) {
2599                         self::update(['visible' => true], ['id' => $item['id']]);
2600                 }
2601
2602                 $new_item['id'] = $new_item_id;
2603
2604                 Hook::callAll('post_local_end', $new_item);
2605
2606                 return true;
2607         }
2608
2609         /**
2610          * Fetch the SQL condition for the given user id
2611          *
2612          * @param integer $owner_id User ID for which the permissions should be fetched
2613          * @return array condition
2614          */
2615         public static function getPermissionsConditionArrayByUserId(int $owner_id): array
2616         {
2617                 $local_user = local_user();
2618                 $remote_user = Session::getRemoteContactID($owner_id);
2619
2620                 // default permissions - anonymous user
2621                 $condition = ["`private` != ?", self::PRIVATE];
2622
2623                 if ($local_user && ($local_user == $owner_id)) {
2624                         // Profile owner - everything is visible
2625                         $condition = [];
2626                 } elseif ($remote_user) {
2627                          // Authenticated visitor - fetch the matching permissionsets
2628                         $permissionSets = DI::permissionSet()->selectByContactId($remote_user, $owner_id);
2629                         if (!empty($set)) {
2630                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2631                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2632                                         self::PRIVATE, self::PRIVATE];
2633                                 $condition = array_merge($condition, $permissionSets->column('id'));
2634                         }
2635                 }
2636
2637                 return $condition;
2638         }
2639
2640         /**
2641          * Get a permission SQL string for the given user
2642          *
2643          * @param int $owner_id
2644          * @param string $table
2645          * @return string
2646          */
2647         public static function getPermissionsSQLByUserId(int $owner_id, string $table = ''): string
2648         {
2649                 $local_user = local_user();
2650                 $remote_user = Session::getRemoteContactID($owner_id);
2651
2652                 if (!empty($table)) {
2653                         $table = DBA::quoteIdentifier($table) . '.';
2654                 }
2655
2656                 /*
2657                  * Construct permissions
2658                  *
2659                  * default permissions - anonymous user
2660                  */
2661                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2662
2663                 // Profile owner - everything is visible
2664                 if ($local_user && ($local_user == $owner_id)) {
2665                         $sql = '';
2666                 } elseif ($remote_user) {
2667                         /*
2668                          * Authenticated visitor. Unless pre-verified,
2669                          * check that the contact belongs to this $owner_id
2670                          * and load the groups the visitor belongs to.
2671                          * If pre-verified, the caller is expected to have already
2672                          * done this and passed the groups into this function.
2673                          */
2674                         $permissionSets = DI::permissionSet()->selectByContactId($remote_user, $owner_id);
2675
2676                         if (!empty($set)) {
2677                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $permissionSets->column('id')) . "))";
2678                         } else {
2679                                 $sql_set = '';
2680                         }
2681
2682                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2683                 }
2684
2685                 return $sql;
2686         }
2687
2688         /**
2689          * get translated item type
2690          *
2691          * @param array                $item
2692          * @param \Friendica\Core\L10n $l10n
2693          * @return string
2694          */
2695         public static function postType(array $item, \Friendica\Core\L10n $l10n): string
2696         {
2697                 if (!empty($item['event-id'])) {
2698                         return $l10n->t('event');
2699                 } elseif (!empty($item['resource-id'])) {
2700                         return $l10n->t('photo');
2701                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2702                         return $l10n->t('activity');
2703                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2704                         return $l10n->t('comment');
2705                 }
2706
2707                 return $l10n->t('post');
2708         }
2709
2710         /**
2711          * Sets the "rendered-html" field of the provided item
2712          *
2713          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2714          *
2715          * @param array $item
2716          *
2717          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2718          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2719          */
2720         private static function putInCache(&$item)
2721         {
2722                 // Save original body to prevent addons to modify it
2723                 $body = $item['body'];
2724
2725                 $rendered_hash = $item['rendered-hash'] ?? '';
2726                 $rendered_html = $item['rendered-html'] ?? '';
2727
2728                 if ($rendered_hash == ''
2729                         || $rendered_html == ''
2730                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2731                         || DI::config()->get('system', 'ignore_cache')
2732                 ) {
2733                         $item['rendered-html'] = BBCode::convertForUriId($item['uri-id'], $item['body']);
2734                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2735
2736                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2737                         Hook::callAll('put_item_in_cache', $hook_data);
2738                         $item['rendered-html'] = $hook_data['rendered-html'];
2739                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2740                         unset($hook_data);
2741
2742                         // Update if the generated values differ from the existing ones
2743                         if ((($rendered_hash != $item['rendered-hash']) || ($rendered_html != $item['rendered-html'])) && !empty($item['id'])) {
2744                                 self::update(
2745                                         [
2746                                                 'rendered-html' => $item['rendered-html'],
2747                                                 'rendered-hash' => $item['rendered-hash']
2748                                         ],
2749                                         ['id' => $item['id']]
2750                                 );
2751                         }
2752                 }
2753
2754                 $item['body'] = $body;
2755         }
2756
2757         /**
2758          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2759          * If attach is true, also add icons for item attachments.
2760          *
2761          * @param array   $item Record from item table
2762          * @param boolean $attach If true, add icons for item attachments as well
2763          * @param boolean $is_preview Whether this is a preview
2764          * @param boolean $only_cache Whether only cached HTML should be updated
2765          * @return string item body html
2766          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2767          * @throws \ImagickException
2768          * @hook  prepare_body_init item array before any work
2769          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2770          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2771          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2772          */
2773         public static function prepareBody(array &$item, bool $attach = false, bool $is_preview = false, bool $only_cache = false): string
2774         {
2775                 $a = DI::app();
2776                 Hook::callAll('prepare_body_init', $item);
2777
2778                 // In order to provide theme developers more possibilities, event items
2779                 // are treated differently.
2780                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2781                         $ev = Event::getItemHTML($item);
2782                         return $ev;
2783                 }
2784
2785                 $tags = Tag::populateFromItem($item);
2786
2787                 $item['tags'] = $tags['tags'];
2788                 $item['hashtags'] = $tags['hashtags'];
2789                 $item['mentions'] = $tags['mentions'];
2790
2791                 $body = $item['body'] ?? '';
2792                 $shared = BBCode::fetchShareAttributes($body);
2793                 if (!empty($shared['guid'])) {
2794                         $shared_item = Post::selectFirst(['uri-id', 'plink', 'has-media'], ['guid' => $shared['guid']]);
2795                         $shared_uri_id = $shared_item['uri-id'] ?? 0;
2796                         $shared_links = [strtolower($shared_item['plink'] ?? '')];
2797                         $shared_attachments = Post\Media::splitAttachments($shared_uri_id, $shared['guid'], [], $shared_item['has-media'] ?? false);
2798                         $shared_links = array_merge($shared_links, array_column($shared_attachments['visual'], 'url'));
2799                         $shared_links = array_merge($shared_links, array_column($shared_attachments['link'], 'url'));
2800                         $shared_links = array_merge($shared_links, array_column($shared_attachments['additional'], 'url'));
2801                         $item['body'] = self::replaceVisualAttachments($shared_attachments, $item['body']);
2802                 } else {
2803                         $shared_uri_id = 0;
2804                         $shared_links = [];
2805                 }
2806                 $attachments = Post\Media::splitAttachments($item['uri-id'], $item['guid'] ?? '', $shared_links, $item['has-media']);
2807                 $item['body'] = self::replaceVisualAttachments($attachments, $item['body'] ?? '');
2808
2809                 $item['body'] = preg_replace("/\s*\[attachment .*?\].*?\[\/attachment\]\s*/ism", "\n", $item['body']);
2810                 self::putInCache($item);
2811                 $item['body'] = $body;
2812                 $s = $item["rendered-html"];
2813
2814                 if ($only_cache) {
2815                         return '';
2816                 }
2817
2818                 // Compile eventual content filter reasons
2819                 $filter_reasons = [];
2820                 if (!$is_preview && public_contact() != $item['author-id']) {
2821                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2822                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2823                         }
2824
2825                         $item['attachments'] = $attachments;
2826
2827                         $hook_data = [
2828                                 'item' => $item,
2829                                 'filter_reasons' => $filter_reasons
2830                         ];
2831                         Hook::callAll('prepare_body_content_filter', $hook_data);
2832                         $filter_reasons = $hook_data['filter_reasons'];
2833                         unset($hook_data);
2834                 }
2835
2836                 $hook_data = [
2837                         'item' => $item,
2838                         'html' => $s,
2839                         'preview' => $is_preview,
2840                         'filter_reasons' => $filter_reasons
2841                 ];
2842                 Hook::callAll('prepare_body', $hook_data);
2843                 $s = $hook_data['html'];
2844                 unset($hook_data);
2845
2846                 if (!$attach) {
2847                         // Replace the blockquotes with quotes that are used in mails.
2848                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2849                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2850                         return $s;
2851                 }
2852
2853                 if (!empty($shared_attachments)) {
2854                         $s = self::addVisualAttachments($shared_attachments, $item, $s, true);
2855                         $s = self::addLinkAttachment($shared_uri_id ?: $item['uri-id'], $shared_attachments, $body, $s, true, []);
2856                         $s = self::addNonVisualAttachments($shared_attachments, $item, $s, true);
2857                         $body = preg_replace("/\s*\[share .*?\].*?\[\/share\]\s*/ism", '', $body);
2858                 }
2859
2860                 $s = self::addVisualAttachments($attachments, $item, $s, false);
2861                 $s = self::addLinkAttachment($item['uri-id'], $attachments, $body, $s, false, $shared_links);
2862                 $s = self::addNonVisualAttachments($attachments, $item, $s, false);
2863                 $s = self::addQuestions($item, $s);
2864
2865                 // Map.
2866                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2867                         $x = Map::byCoordinates(trim($item['coord']));
2868                         if ($x) {
2869                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2870                         }
2871                 }
2872
2873                 // Replace friendica image url size with theme preference.
2874                 if (!empty($a->getThemeInfoValue('item_image_size'))) {
2875                         $ps = $a->getThemeInfoValue('item_image_size');
2876                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2877                 }
2878
2879                 $s = HTML::applyContentFilter($s, $filter_reasons);
2880
2881                 $hook_data = ['item' => $item, 'html' => $s];
2882                 Hook::callAll('prepare_body_final', $hook_data);
2883
2884                 return $hook_data['html'];
2885         }
2886
2887         /**
2888          * Check if the body contains a link
2889          *
2890          * @param string $body
2891          * @param string $url
2892          * @param int    $type
2893          * @return bool
2894          */
2895         public static function containsLink(string $body, string $url, int $type = 0): bool
2896         {
2897                 // Make sure that for example site parameters aren't used when testing if the link is contained in the body
2898                 $urlparts = parse_url($url);
2899                 unset($urlparts['query']);
2900                 unset($urlparts['fragment']);
2901                 $url = Network::unparseURL($urlparts);
2902
2903                 // Remove media links to only search in embedded content
2904                 // @todo Check images for image link, audio for audio links, ...
2905                 if (in_array($type, [Post\Media::AUDIO, Post\Media::VIDEO, Post\Media::IMAGE])) {
2906                         $body = preg_replace("/\[url=[^\[\]]*\](.*)\[\/url\]/Usi", ' $1 ', $body);
2907                 }
2908
2909                 if (strpos($body, $url)) {
2910                         return true;
2911                 }
2912                 foreach ([0, 1, 2] as $size) {
2913                         if (preg_match('#/photo/.*-' . $size . '\.#ism', $url) &&
2914                                 strpos(preg_replace('#(/photo/.*)-[012]\.#ism', '$1-' . $size . '.', $body), $url)) {
2915                                 return true;
2916                         }
2917                 }
2918                 return false;
2919         }
2920
2921         /**
2922          * Replace visual attachments in the body
2923          *
2924          * @param array $attachments
2925          * @param string $body
2926          * @return string modified body
2927          */
2928         private static function replaceVisualAttachments(array $attachments, string $body): string
2929         {
2930                 DI::profiler()->startRecording('rendering');
2931
2932                 foreach ($attachments['visual'] as $attachment) {
2933                         if (!empty($attachment['preview'])) {
2934                                 $proxy   = Post\Media::getPreviewUrlForId($attachment['id'], Proxy::SIZE_LARGE);
2935                                 $search  = ['[img=' . $attachment['preview'] . ']', ']' . $attachment['preview'] . '[/img]'];
2936                                 $replace = ['[img=' . $proxy . ']', ']' . $proxy . '[/img]'];
2937
2938                                 $body = str_replace($search, $replace, $body);
2939                         } elseif ($attachment['filetype'] == 'image') {
2940                                 $proxy   = Post\Media::getUrlForId($attachment['id']);
2941                                 $search  = ['[img=' . $attachment['url'] . ']', ']' . $attachment['url'] . '[/img]'];
2942                                 $replace = ['[img=' . $proxy . ']', ']' . $proxy . '[/img]'];
2943
2944                                 $body = str_replace($search, $replace, $body);
2945                         }
2946                 }
2947                 DI::profiler()->stopRecording();
2948                 return $body;
2949         }
2950
2951         /**
2952          * Add visual attachments to the content
2953          *
2954          * @param array $attachments
2955          * @param array $item
2956          * @param string $content
2957          * @return string modified content
2958          */
2959         private static function addVisualAttachments(array $attachments, array $item, string $content, bool $shared): string
2960         {
2961                 DI::profiler()->startRecording('rendering');
2962                 $leading = '';
2963                 $trailing = '';
2964
2965                 // @todo In the future we should make a single for the template engine with all media in it. This allows more flexibilty.
2966                 foreach ($attachments['visual'] as $attachment) {
2967                         if (self::containsLink($item['body'], $attachment['preview'] ?? $attachment['url'], $attachment['type'])) {
2968                                 continue;
2969                         }
2970
2971                         if (!empty($attachment['preview'])) {
2972                                 $preview_url = Post\Media::getPreviewUrlForId($attachment['id'], Proxy::SIZE_LARGE);
2973                         } else {
2974                                 $preview_url = '';
2975                         }
2976
2977                         if (($attachment['filetype'] == 'video')) {
2978                                 /// @todo Move the template to /content as well
2979                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2980                                         '$video' => [
2981                                                 'id'      => $attachment['id'],
2982                                                 'src'     => $attachment['url'],
2983                                                 'name'    => $attachment['name'] ?: $attachment['url'],
2984                                                 'preview' => $preview_url,
2985                                                 'mime'    => $attachment['mimetype'],
2986                                         ],
2987                                 ]);
2988                                 if (($item['post-type'] ?? null) == Item::PT_VIDEO) {
2989                                         $leading .= $media;
2990                                 } else {
2991                                         $trailing .= $media;
2992                                 }
2993                         } elseif ($attachment['filetype'] == 'audio') {
2994                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('content/audio.tpl'), [
2995                                         '$audio' => [
2996                                                 'id'     => $attachment['id'],
2997                                                 'src'    => $attachment['url'],
2998                                                 'name'   => $attachment['name'] ?: $attachment['url'],
2999                                                 'mime'   => $attachment['mimetype'],
3000                                         ],
3001                                 ]);
3002                                 if (($item['post-type'] ?? null) == Item::PT_AUDIO) {
3003                                         $leading .= $media;
3004                                 } else {
3005                                         $trailing .= $media;
3006                                 }
3007                         } elseif ($attachment['filetype'] == 'image') {
3008                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('content/image.tpl'), [
3009                                         '$image' => [
3010                                                 'src'        => Post\Media::getUrlForId($attachment['id']),
3011                                                 'preview'    => Post\Media::getPreviewUrlForId($attachment['id'], ($attachment['width'] > $attachment['height']) ? Proxy::SIZE_MEDIUM : Proxy::SIZE_LARGE),
3012                                                 'attachment' => $attachment,
3013                                         ],
3014                                 ]);
3015                                 // On Diaspora posts the attached pictures are leading
3016                                 if ($item['network'] == Protocol::DIASPORA) {
3017                                         $leading .= $media;
3018                                 } else {
3019                                         $trailing .= $media;
3020                                 }
3021                         }
3022                 }
3023
3024                 if ($shared) {
3025                         $content = str_replace(BBCode::TOP_ANCHOR, '<div class="body-attach">' . $leading . '<div class="clear"></div></div>' . BBCode::TOP_ANCHOR, $content);
3026                         $content = str_replace(BBCode::BOTTOM_ANCHOR, '<div class="body-attach">' . $trailing . '<div class="clear"></div></div>' . BBCode::BOTTOM_ANCHOR, $content);
3027                 } else {
3028                         if ($leading != '') {
3029                                 $content = '<div class="body-attach">' . $leading . '<div class="clear"></div></div>' . $content;
3030                         }
3031
3032                         if ($trailing != '') {
3033                                 $content .= '<div class="body-attach">' . $trailing . '<div class="clear"></div></div>';
3034                         }
3035                 }
3036
3037                 DI::profiler()->stopRecording();
3038                 return $content;
3039         }
3040
3041         /**
3042          * Add link attachment to the content
3043          *
3044          * @param array  $attachments
3045          * @param string $body
3046          * @param string $content
3047          * @param bool   $shared
3048          * @param array  $ignore_links A list of URLs to ignore
3049          * @return string modified content
3050          */
3051         private static function addLinkAttachment(int $uriid, array $attachments, string $body, string $content, bool $shared, array $ignore_links): string
3052         {
3053                 DI::profiler()->startRecording('rendering');
3054                 // Don't show a preview when there is a visual attachment (audio or video)
3055                 $types = array_column($attachments['visual'], 'type');
3056                 $preview = !in_array(Post\Media::IMAGE, $types) && !in_array(Post\Media::VIDEO, $types);
3057
3058                 if (!empty($attachments['link'])) {
3059                         foreach ($attachments['link'] as $link) {
3060                                 $found = false;
3061                                 foreach ($ignore_links as $ignore_link) {
3062                                         if (Strings::compareLink($link['url'], $ignore_link)) {
3063                                                 $found = true;
3064                                         }
3065                                 }
3066                                 // @todo Judge between the links to use the one with most information
3067                                 if (!$found && (empty($attachment) || !empty($link['author-name']) ||
3068                                         (empty($attachment['name']) && !empty($link['name'])) ||
3069                                         (empty($attachment['description']) && !empty($link['description'])) ||
3070                                         (empty($attachment['preview']) && !empty($link['preview'])))) {
3071                                         $attachment = $link;
3072                                 }
3073                         }
3074                 }
3075
3076                 if (!empty($attachment)) {
3077                         $data = [
3078                                 'after' => '',
3079                                 'author_name' => $attachment['author-name'] ?? '',
3080                                 'author_url' =>  $attachment['author-url'] ?? '',
3081                                 'description' => $attachment['description'] ?? '',
3082                                 'image' => '',
3083                                 'preview' => '',
3084                                 'provider_name' => $attachment['publisher-name'] ?? '',
3085                                 'provider_url' => $attachment['publisher-url'] ?? '',
3086                                 'text' => '',
3087                                 'title' => $attachment['name'] ?? '',
3088                                 'type' => 'link',
3089                                 'url' => $attachment['url']];
3090
3091                         if ($preview && !empty($attachment['preview'])) {
3092                                 if ($attachment['preview-width'] >= 500) {
3093                                         $data['image'] = Post\Media::getPreviewUrlForId($attachment['id'], Proxy::SIZE_MEDIUM);
3094                                 } else {
3095                                         $data['preview'] = Post\Media::getPreviewUrlForId($attachment['id'], Proxy::SIZE_MEDIUM);
3096                                 }
3097                         }
3098
3099                         if (!empty($data['description']) && !empty($content)) {
3100                                 similar_text($data['description'], $content, $percent);
3101                         } else {
3102                                 $percent = 0;
3103                         }
3104
3105                         if (!empty($data['description']) && (($data['title'] == $data['description']) || ($percent > 95) || (strpos($content, $data['description']) !== false))) {
3106                                 $data['description'] = '';
3107                         }
3108
3109                         if (($data['author_name'] ?? '') == ($data['provider_name'] ?? '')) {
3110                                 $data['author_name'] = '';
3111                         }
3112
3113                         if (($data['author_url'] ?? '') == ($data['provider_url'] ?? '')) {
3114                                 $data['author_url'] = '';
3115                         }
3116                 } elseif (preg_match("/.*(\[attachment.*?\].*?\[\/attachment\]).*/ism", $body, $match)) {
3117                         $data = BBCode::getAttachmentData($match[1]);
3118                 }
3119                 DI::profiler()->stopRecording();
3120
3121                 if (isset($data['url']) && !in_array($data['url'], $ignore_links)) {
3122                         if (!empty($data['description']) || !empty($data['image']) || !empty($data['preview'])) {
3123                                 $parts = parse_url($data['url']);
3124                                 if (!empty($parts['scheme']) && !empty($parts['host'])) {
3125                                         if (empty($data['provider_name'])) {
3126                                                 $data['provider_name'] = $parts['host'];
3127                                         }
3128                                         if (empty($data['provider_url']) || empty(parse_url($data['provider_url'], PHP_URL_SCHEME))) {
3129                                                 $data['provider_url'] = $parts['scheme'] . '://' . $parts['host'];
3130
3131                                                 if (!empty($parts['port'])) {
3132                                                         $data['provider_url'] .= ':' . $parts['port'];
3133                                                 }
3134                                         }
3135                                 }
3136
3137                                 // @todo Use a template
3138                                 $rendered = BBCode::convertAttachment('', BBCode::INTERNAL, false, $data, $uriid);
3139                         } elseif (!self::containsLink($content, $data['url'], Post\Media::HTML)) {
3140                                 $rendered = Renderer::replaceMacros(Renderer::getMarkupTemplate('content/link.tpl'), [
3141                                         '$url'  => $data['url'],
3142                                         '$title' => $data['title'],
3143                                 ]);
3144                         } else {
3145                                 return $content;
3146                         }
3147
3148                         if ($shared) {
3149                                 return str_replace(BBCode::BOTTOM_ANCHOR, BBCode::BOTTOM_ANCHOR . $rendered, $content);
3150                         } else {
3151                                 return $content . $rendered;
3152                         }
3153                 }
3154                 return $content;
3155         }
3156
3157         /**
3158          * Add non visual attachments to the content
3159          *
3160          * @param array $attachments
3161          * @param array $item
3162          * @param string $content
3163          * @return string modified content
3164          */
3165         private static function addNonVisualAttachments(array $attachments, array $item, string $content): string
3166         {
3167                 DI::profiler()->startRecording('rendering');
3168                 $trailing = '';
3169                 foreach ($attachments['additional'] as $attachment) {
3170                         if (strpos($item['body'], $attachment['url'])) {
3171                                 continue;
3172                         }
3173
3174                         $author = ['uid' => 0, 'id' => $item['author-id'],
3175                                 'network' => $item['author-network'], 'url' => $item['author-link']];
3176                         $the_url = Contact::magicLinkByContact($author, $attachment['url']);
3177
3178                         $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
3179
3180                         if (!empty($attachment['size'])) {
3181                                 $title .= ' ' . $attachment['size'] . ' ' . DI::l10n()->t('bytes');
3182                         }
3183
3184                         /// @todo Use a template
3185                         $icon = '<div class="attachtype icon s22 type-' . $attachment['filetype'] . ' subtype-' . $attachment['subtype'] . '"></div>';
3186                         $trailing .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
3187                 }
3188
3189                 if ($trailing != '') {
3190                         $content .= '<div class="body-attach">' . $trailing . '<div class="clear"></div></div>';
3191                 }
3192
3193                 DI::profiler()->stopRecording();
3194                 return $content;
3195         }
3196
3197         private static function addQuestions(array $item, string $content): string
3198         {
3199                 DI::profiler()->startRecording('rendering');
3200                 if (!empty($item['question-id'])) {
3201                         $question = [
3202                                 'id'       => $item['question-id'],
3203                                 'multiple' => $item['question-multiple'],
3204                                 'voters'   => $item['question-voters'],
3205                                 'endtime'  => $item['question-end-time']
3206                         ];
3207
3208                         $options = Post\QuestionOption::getByURIId($item['uri-id']);
3209                         foreach ($options as $key => $option) {
3210                                 $percent = $question['voters'] ? ($option['replies'] / $question['voters'] * 100) : 0;
3211
3212                                 $options[$key]['percent'] = $percent;
3213
3214                                 if ($question['voters'] > 0) {
3215                                         $options[$key]['vote'] = DI::l10n()->t('%s (%d%s, %d votes)', $option['name'], round($percent, 1), '%', $option['replies']);
3216                                 } else {
3217                                         $options[$key]['vote'] = DI::l10n()->t('%s (%d votes)', $option['name'], $option['replies']);
3218                                 }
3219                         }
3220
3221                         if (!empty($question['voters']) && !empty($question['endtime'])) {
3222                                 $summary = DI::l10n()->t('%d voters. Poll end: %s', $question['voters'], Temporal::getRelativeDate($question['endtime']));
3223                         } elseif (!empty($question['voters'])) {
3224                                 $summary = DI::l10n()->t('%d voters.', $question['voters']);
3225                         } elseif (!empty($question['endtime'])) {
3226                                 $summary = DI::l10n()->t('Poll end: %s', Temporal::getRelativeDate($question['endtime']));
3227                         } else {
3228                                 $summary = '';
3229                         }
3230
3231                         $content .= Renderer::replaceMacros(Renderer::getMarkupTemplate('content/question.tpl'), [
3232                                 '$question' => $question,
3233                                 '$options'  => $options,
3234                                 '$summary'  => $summary,
3235                         ]);
3236         }
3237                 DI::profiler()->stopRecording();
3238                 return $content;
3239         }
3240
3241         /**
3242          * get private link for item
3243          *
3244          * @param array $item
3245          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
3246          * @throws \Exception
3247          */
3248         public static function getPlink(array $item)
3249         {
3250                 if (!empty($item['plink']) && Network::isValidHttpUrl($item['plink'])) {
3251                         $plink = $item['plink'];
3252                 } elseif (!empty($item['uri']) && Network::isValidHttpUrl($item['uri']) && !Network::isLocalLink($item['uri'])) {
3253                         $plink = $item['uri'];
3254                 }
3255
3256                 if (local_user()) {
3257                         $ret = [
3258                                 'href' => "display/" . $item['guid'],
3259                                 'orig' => "display/" . $item['guid'],
3260                                 'title' => DI::l10n()->t('View on separate page'),
3261                                 'orig_title' => DI::l10n()->t('View on separate page'),
3262                         ];
3263
3264                         if (!empty($plink) && ($item['private'] == self::PRIVATE)) {
3265                                 $author = ['uid' => 0, 'id' => $item['author-id'],
3266                                         'network' => $item['author-network'], 'url' => $item['author-link']];
3267                                 $plink = Contact::magicLinkByContact($author, $plink);
3268                         }
3269
3270                         if (!empty($plink)) {
3271                                 $ret['href'] = DI::baseUrl()->remove($plink);
3272                                 $ret['title'] = DI::l10n()->t('Link to source');
3273                         }
3274                 } elseif (!empty($plink) && ($item['private'] != self::PRIVATE)) {
3275                         $ret = [
3276                                 'href' => $plink,
3277                                 'orig' => $plink,
3278                                 'title' => DI::l10n()->t('Link to source'),
3279                                 'orig_title' => DI::l10n()->t('Link to source'),
3280                         ];
3281                 } else {
3282                         $ret = [];
3283                 }
3284
3285                 return $ret;
3286         }
3287
3288         /**
3289          * Does the given uri-id belongs to a post that is sent as starting post to a forum?
3290          *
3291          * @param int $uri_id
3292          *
3293          * @return boolean "true" when it is a forum post
3294          */
3295         public static function isForumPost(int $uri_id): bool
3296         {
3297                 foreach (Tag::getByURIId($uri_id, [Tag::EXCLUSIVE_MENTION]) as $tag) {
3298                         if (DBA::exists('contact', ['uid' => 0, 'nurl' => Strings::normaliseLink($tag['url']), 'contact-type' => Contact::TYPE_COMMUNITY])) {
3299                                 return true;
3300                         }
3301                 }
3302                 return false;
3303         }
3304
3305         /**
3306          * Search item id for given URI or plink
3307          *
3308          * @param string $uri
3309          * @param integer $uid
3310          *
3311          * @return integer item id
3312          */
3313         public static function searchByLink(string $uri, int $uid = 0): int
3314         {
3315                 $ssl_uri = str_replace('http://', 'https://', $uri);
3316                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3317
3318                 $item = Post::selectFirst(['id'], ['uri' => $uris, 'uid' => $uid]);
3319                 if (DBA::isResult($item)) {
3320                         return $item['id'];
3321                 }
3322
3323                 $item = Post::selectFirst(['id'], ['plink' => $uris, 'uid' => $uid]);
3324                 if (DBA::isResult($item)) {
3325                         return $item['id'];
3326                 }
3327
3328                 return 0;
3329         }
3330
3331         /**
3332          * Return the URI for a link to the post
3333          *
3334          * @param string $uri URI or link to post
3335          *
3336          * @return string URI
3337          */
3338         public static function getURIByLink(string $uri): string
3339         {
3340                 $ssl_uri = str_replace('http://', 'https://', $uri);
3341                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3342
3343                 $item = Post::selectFirst(['uri'], ['uri' => $uris]);
3344                 if (DBA::isResult($item)) {
3345                         return $item['uri'];
3346                 }
3347
3348                 $item = Post::selectFirst(['uri'], ['plink' => $uris]);
3349                 if (DBA::isResult($item)) {
3350                         return $item['uri'];
3351                 }
3352
3353                 return '';
3354         }
3355
3356         /**
3357          * Fetches item for given URI or plink
3358          *
3359          * @param string $uri
3360          * @param integer $uid
3361          *
3362          * @return integer item id
3363          */
3364         public static function fetchByLink(string $uri, int $uid = 0): int
3365         {
3366                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
3367                 $item_id = self::searchByLink($uri, $uid);
3368                 if (!empty($item_id)) {
3369                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3370                         return $item_id;
3371                 }
3372
3373                 $hookData = [
3374                         'uri'     => $uri,
3375                         'uid'     => $uid,
3376                         'item_id' => null,
3377                 ];
3378
3379                 Hook::callAll('item_by_link', $hookData);
3380
3381                 if (isset($hookData['item_id'])) {
3382                         return is_numeric($hookData['item_id']) ? $hookData['item_id'] : 0;
3383                 }
3384
3385                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
3386                         $item_id = self::searchByLink($fetched_uri, $uid);
3387                 } else {
3388                         $item_id = Diaspora::fetchByURL($uri);
3389                 }
3390
3391                 if (!empty($item_id)) {
3392                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3393                         return $item_id;
3394                 }
3395
3396                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
3397                 return 0;
3398         }
3399
3400         /**
3401          * Return share data from an item array (if the item is shared item)
3402          * We are providing the complete Item array, because at some time in the future
3403          * we hopefully will define these values not in the body anymore but in some item fields.
3404          * This function is meant to replace all similar functions in the system.
3405          *
3406          * @param array $item
3407          *
3408          * @return array with share information
3409          */
3410         public static function getShareArray(array $item): array
3411         {
3412                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
3413                         return [];
3414                 }
3415
3416                 $attribute_string = $matches[2];
3417                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
3418                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
3419                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
3420                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
3421                         }
3422                 }
3423                 return $attributes;
3424         }
3425
3426         /**
3427          * Fetch item information for shared items from the original items and adds it.
3428          *
3429          * @param array $item
3430          *
3431          * @return array item array with data from the original item
3432          */
3433         public static function addShareDataFromOriginal(array $item): array
3434         {
3435                 $shared = self::getShareArray($item);
3436                 if (empty($shared)) {
3437                         return $item;
3438                 }
3439
3440                 // Real reshares always have got a GUID.
3441                 if (empty($shared['guid'])) {
3442                         return $item;
3443                 }
3444
3445                 $uid = $item['uid'] ?? 0;
3446
3447                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
3448                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
3449                 if (!DBA::isResult($shared_item)) {
3450                         if (empty($shared['link'])) {
3451                                 return $item;
3452                         }
3453
3454                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
3455                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
3456                         if (empty($id)) {
3457                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
3458                                 return $item;
3459                         }
3460
3461                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
3462                         if (!DBA::isResult($shared_item)) {
3463                                 return $item;
3464                         }
3465                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
3466                 } else {
3467                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
3468                 }
3469
3470                 if (!empty($shared_item['title'])) {
3471                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
3472                         unset($shared_item['title']);
3473                 } else {
3474                         $body = $shared_item['body'];
3475                 }
3476
3477                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . str_replace('$', '\$', $body) . '[/share]', $item['body']);
3478                 unset($shared_item['body']);
3479
3480                 return array_merge($item, $shared_item);
3481         }
3482
3483         /**
3484          * Check a prospective item array against user-level permissions
3485          *
3486          * @param array $item Expected keys: uri, gravity, and
3487          *                    author-link if is author-id is set,
3488          *                    owner-link if is owner-id is set,
3489          *                    causer-link if is causer-id is set.
3490          * @param int   $user_id Local user ID
3491          * @return bool
3492          * @throws \Exception
3493          */
3494         protected static function isAllowedByUser(array $item, int $user_id): bool
3495         {
3496                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3497                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3498                         return false;
3499                 }
3500
3501                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3502                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3503                         return false;
3504                 }
3505
3506                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3507                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3508                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3509                         return false;
3510                 }
3511
3512                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3513                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3514                         return false;
3515                 }
3516
3517                 return true;
3518         }
3519
3520         /**
3521          * Improve the data in shared posts
3522          *
3523          * @param array $item
3524          * @return string body
3525          */
3526         public static function improveSharedDataInBody(array $item): string
3527         {
3528                 $shared = BBCode::fetchShareAttributes($item['body']);
3529                 if (empty($shared['link'])) {
3530                         return $item['body'];
3531                 }
3532
3533                 $id = self::fetchByLink($shared['link']);
3534                 Logger::info('Fetched shared post', ['uri-id' => $item['uri-id'], 'id' => $id, 'author' => $shared['profile'], 'url' => $shared['link'], 'guid' => $shared['guid'], 'callstack' => System::callstack()]);
3535                 if (!$id) {
3536                         return $item['body'];
3537                 }
3538
3539                 $shared_item = Post::selectFirst(['author-name', 'author-link', 'author-avatar', 'plink', 'created', 'guid', 'title', 'body'], ['id' => $id]);
3540                 if (!DBA::isResult($shared_item)) {
3541                         return $item['body'];
3542                 }
3543
3544                 $shared_content = BBCode::getShareOpeningTag($shared_item['author-name'], $shared_item['author-link'], $shared_item['author-avatar'], $shared_item['plink'], $shared_item['created'], $shared_item['guid']);
3545
3546                 if (!empty($shared_item['title'])) {
3547                         $shared_content .= '[h3]'.$shared_item['title'].'[/h3]'."\n";
3548                 }
3549
3550                 $shared_content .= $shared_item['body'];
3551
3552                 $item['body'] = preg_replace("/\[share.*?\](.*)\[\/share\]/ism", $shared_content . '[/share]', $item['body']);
3553                 Logger::info('New shared data', ['uri-id' => $item['uri-id'], 'id' => $id, 'shared_item' => $shared_item]);
3554                 return $item['body'];
3555         }
3556 }