src/Model/Item.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use Friendica\Content\Text\BBCode;
  25 use Friendica\Content\Text\HTML;
  26 use Friendica\Core\Hook;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\Renderer;
  30 use Friendica\Core\Session;
  31 use Friendica\Core\System;
  32 use Friendica\Model\Tag;
  33 use Friendica\Core\Worker;
  34 use Friendica\Database\DBA;
  35 use Friendica\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\Strings;
  44 use Friendica\Worker\Delivery;
  45 use LanguageDetection\Language;
  46
  47 class Item
  48 {
  49         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  50         const PT_ARTICLE = 0;
  51         const PT_NOTE = 1;
  52         const PT_PAGE = 2;
  53         const PT_IMAGE = 16;
  54         const PT_AUDIO = 17;
  55         const PT_VIDEO = 18;
  56         const PT_DOCUMENT = 19;
  57         const PT_EVENT = 32;
  58         const PT_TAG = 64;
  59         const PT_TO = 65;
  60         const PT_CC = 66;
  61         const PT_BTO = 67;
  62         const PT_BCC = 68;
  63         const PT_FOLLOWER = 69;
  64         const PT_ANNOUNCEMENT = 70;
  65         const PT_COMMENT = 71;
  66         const PT_STORED = 72;
  67         const PT_GLOBAL = 73;
  68         const PT_RELAY = 74;
  69         const PT_FETCHED = 75;
  70         const PT_PERSONAL_NOTE = 128;
  71
  72         // Field list that is used to display the items
  73         const DISPLAY_FIELDLIST = [
  74                 'uid', 'id', 'parent', 'guid', 'network', 'gravity',
  75                 'uri-id', 'uri', 'thr-parent-id', 'thr-parent', 'parent-uri-id', 'parent-uri',
  76                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  77                 'wall', 'private', 'starred', 'origin', 'parent-origin', 'title', 'body', 'language',
  78                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  79                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'mention',
  80                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  81                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network', 'owner-contact-type',
  82                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type', 'causer-network',
  83                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  84                 'writable', 'self', 'cid', 'alias',
  85                 'event-created', 'event-edited', 'event-start', 'event-finish',
  86                 'event-summary', 'event-desc', 'event-location', 'event-type',
  87                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  88                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  89         ];
  90
  91         // Field list that is used to deliver items via the protocols
  92         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  93                         'parent-guid', 'received', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  94                         'private', 'title', 'body', 'raw-body', 'location', 'coord', 'app',
  95                         'inform', 'deleted', 'extid', 'post-type', 'gravity',
  96                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  97                         'author-id', 'author-link', 'owner-id', 'owner-link', 'contact-uid',
  98                         'signed_text', 'network', 'wall', 'contact-id', 'plink', 'forum_mode', 'origin',
  99                         'thr-parent-id', 'parent-uri-id', 'postopts', 'pubmail',
 100                         'event-created', 'event-edited', 'event-start', 'event-finish',
 101                         'event-summary', 'event-desc', 'event-location', 'event-type',
 102                         'event-nofinish', 'event-adjust', 'event-ignore', 'event-id'];
 103
 104         // All fields in the item table
 105         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 106                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 107                         'contact-id', 'wall', 'gravity', 'extid', 'psid',
 108                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 109                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 110                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
 111                         'private', 'pubmail', 'visible', 'starred',
 112                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 113                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 114                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 115                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 116                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 117
 118         // List of all verbs that don't need additional content data.
 119         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 120         const ACTIVITIES = [
 121                 Activity::LIKE, Activity::DISLIKE,
 122                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 123                 Activity::FOLLOW,
 124                 Activity::ANNOUNCE];
 125
 126         const PUBLIC = 0;
 127         const PRIVATE = 1;
 128         const UNLISTED = 2;
 129
 130         /**
 131          * Update existing item entries
 132          *
 133          * @param array $fields    The fields that are to be changed
 134          * @param array $condition The condition for finding the item entries
 135          *
 136          * In the future we may have to change permissions as well.
 137          * Then we had to add the user id as third parameter.
 138          *
 139          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 140          *
 141          * @return integer|boolean number of affected rows - or "false" if there was an error
 142          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 143          */
 144         public static function update(array $fields, array $condition)
 145         {
 146                 if (empty($condition) || empty($fields)) {
 147                         return false;
 148                 }
 149
 150                 if (!empty($fields['verb'])) {
 151                         $fields['vid'] = Verb::getID($fields['verb']);
 152                 }
 153
 154                 $rows = Post::update($fields, $condition);
 155                 if (is_bool($rows)) {
 156                         return $rows;
 157                 }
 158
 159                 // We only need to call the line by line update for specific fields
 160                 if (empty($fields['body']) && empty($fields['file']) &&
 161                         empty($fields['attach']) && empty($fields['edited'])) {
 162                         return $rows;
 163                 }
 164
 165                 Logger::info('Updating per single row method', ['fields' => $fields, 'condition' => $condition]);
 166
 167                 $items = Post::select(['id', 'origin', 'uri-id', 'uid'], $condition);
 168
 169                 $notify_items = [];
 170
 171                 while ($item = DBA::fetch($items)) {
 172                         if (!empty($fields['body'])) {
 173                                 $content_fields = ['raw-body' => trim($fields['raw-body'] ?? $fields['body'])];
 174
 175                                 // Remove all media attachments from the body and store them in the post-media table
 176                                 $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 177                                 $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 178                         }
 179
 180                         if (!empty($fields['file'])) {
 181                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $fields['file']);
 182                         }
 183
 184                         if (!empty($fields['attach'])) {
 185                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 186                         }
 187
 188                         // We only need to notfiy others when it is an original entry from us.
 189                         // Only call the notifier when the item has some content relevant change.
 190                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 191                                 $notify_items[] = $item['id'];
 192                         }
 193                 }
 194
 195                 DBA::close($items);
 196
 197                 foreach ($notify_items as $notify_item) {
 198                         $post = Post::selectFirst(['uri-id', 'uid'], ['id' => $notify_item]);
 199                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, (int)$post['uri-id'], (int)$post['uid']);
 200                 }
 201
 202                 return $rows;
 203         }
 204
 205         /**
 206          * Delete an item and notify others about it - if it was ours
 207          *
 208          * @param array   $condition The condition for finding the item entries
 209          * @param integer $priority  Priority for the notification
 210          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 211          */
 212         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 213         {
 214                 $items = Post::select(['id'], $condition);
 215                 while ($item = Post::fetch($items)) {
 216                         self::markForDeletionById($item['id'], $priority);
 217                 }
 218                 DBA::close($items);
 219         }
 220
 221         /**
 222          * Delete an item for an user and notify others about it - if it was ours
 223          *
 224          * @param array   $condition The condition for finding the item entries
 225          * @param integer $uid       User who wants to delete this item
 226          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 227          */
 228         public static function deleteForUser($condition, $uid)
 229         {
 230                 if ($uid == 0) {
 231                         return;
 232                 }
 233
 234                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 235                 while ($item = Post::fetch($items)) {
 236                         if (in_array($item['uid'], [$uid, 0])) {
 237                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 238                                 Post\ThreadUser::update($item['uri-id'], $uid, ['hidden' => true], true);
 239                         }
 240
 241                         if ($item['uid'] == $uid) {
 242                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 243                         } elseif ($item['uid'] != 0) {
 244                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
 245                         }
 246                 }
 247                 DBA::close($items);
 248         }
 249
 250         /**
 251          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 252          *
 253          * @param integer $item_id
 254          * @param integer $priority Priority for the notification
 255          *
 256          * @return boolean success
 257          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 258          */
 259         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 260         {
 261                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 262                 // locate item to be deleted
 263                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri-id', 'origin',
 264                         'deleted', 'resource-id', 'event-id',
 265                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 266                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 267                 if (!DBA::isResult($item)) {
 268                         Logger::info('Item not found.', ['id' => $item_id]);
 269                         return false;
 270                 }
 271
 272                 if ($item['deleted']) {
 273                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 274                         return false;
 275                 }
 276
 277                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 278                 if (!DBA::isResult($parent)) {
 279                         $parent = ['origin' => false];
 280                 }
 281
 282                 // clean up categories and tags so they don't end up as orphans
 283                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 284
 285                 /*
 286                  * If item is a link to a photo resource, nuke all the associated photos
 287                  * (visitors will not have photo resources)
 288                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 289                  * generate a resource-id and therefore aren't intimately linked to the item.
 290                  */
 291                 /// @TODO: this should first check if photo is used elsewhere
 292                 if (strlen($item['resource-id'])) {
 293                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 294                 }
 295
 296                 // If item is a link to an event, delete the event.
 297                 if (intval($item['event-id'])) {
 298                         Event::delete($item['event-id']);
 299                 }
 300
 301                 // If item has attachments, drop them
 302                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 303                 foreach($attachments as $attachment) {
 304                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 305                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 306                         }
 307                 }
 308
 309                 // Set the item to "deleted"
 310                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 311                 Post::update($item_fields, ['id' => $item['id']]);
 312
 313                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 314
 315                 if (!Post::exists(["`uri-id` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri-id']])) {
 316                         self::markForDeletion(['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false], $priority);
 317                 }
 318
 319                 Post\DeliveryData::delete($item['uri-id']);
 320
 321                 // If it's the parent of a comment thread, kill all the kids
 322                 if ($item['gravity'] == GRAVITY_PARENT) {
 323                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 324                 }
 325
 326                 // Is it our comment and/or our thread?
 327                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 328                         // When we delete the original post we will delete all existing copies on the server as well
 329                         self::markForDeletion(['uri-id' => $item['uri-id'], 'deleted' => false], $priority);
 330
 331                         // send the notification upstream/downstream
 332                         if ($priority) {
 333                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, (int)$item['uri-id'], (int)$item['uid']);
 334                         }
 335                 } elseif ($item['uid'] != 0) {
 336                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 337                         Post\ThreadUser::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 338                 }
 339
 340                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 341
 342                 return true;
 343         }
 344
 345         private static function guid($item, $notify)
 346         {
 347                 if (!empty($item['guid'])) {
 348                         return Strings::escapeTags(trim($item['guid']));
 349                 }
 350
 351                 if ($notify) {
 352                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 353                         // We add the hash of our own host because our host is the original creator of the post.
 354                         $prefix_host = DI::baseUrl()->getHostname();
 355                 } else {
 356                         $prefix_host = '';
 357
 358                         // We are only storing the post so we create a GUID from the original hostname.
 359                         if (!empty($item['author-link'])) {
 360                                 $parsed = parse_url($item['author-link']);
 361                                 if (!empty($parsed['host'])) {
 362                                         $prefix_host = $parsed['host'];
 363                                 }
 364                         }
 365
 366                         if (empty($prefix_host) && !empty($item['plink'])) {
 367                                 $parsed = parse_url($item['plink']);
 368                                 if (!empty($parsed['host'])) {
 369                                         $prefix_host = $parsed['host'];
 370                                 }
 371                         }
 372
 373                         if (empty($prefix_host) && !empty($item['uri'])) {
 374                                 $parsed = parse_url($item['uri']);
 375                                 if (!empty($parsed['host'])) {
 376                                         $prefix_host = $parsed['host'];
 377                                 }
 378                         }
 379
 380                         // Is it in the format data@host.tld? - Used for mail contacts
 381                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 382                                 $mailparts = explode('@', $item['author-link']);
 383                                 $prefix_host = array_pop($mailparts);
 384                         }
 385                 }
 386
 387                 if (!empty($item['plink'])) {
 388                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 389                 } elseif (!empty($item['uri'])) {
 390                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 391                 } else {
 392                         $guid = System::createUUID(hash('crc32', $prefix_host));
 393                 }
 394
 395                 return $guid;
 396         }
 397
 398         private static function contactId($item)
 399         {
 400                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 401                         return $item['contact-id'];
 402                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 403                         return $item['contact-id'];
 404                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 405                         return $item['author-id'];
 406                 } elseif (!empty($item['contact-id'])) {
 407                         return $item['contact-id'];
 408                 } else {
 409                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 410                         if (!empty($contact_id)) {
 411                                 return $contact_id;
 412                         }
 413                 }
 414                 return $item['author-id'];
 415         }
 416
 417         /**
 418          * Write an item array into a spool file to be inserted later.
 419          * This command is called whenever there are issues storing an item.
 420          *
 421          * @param array $item The item fields that are to be inserted
 422          * @throws \Exception
 423          */
 424         private static function spool($orig_item)
 425         {
 426                 // Now we store the data in the spool directory
 427                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 428                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 429
 430                 $spoolpath = get_spoolpath();
 431                 if ($spoolpath != "") {
 432                         $spool = $spoolpath . '/' . $file;
 433
 434                         file_put_contents($spool, json_encode($orig_item));
 435                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 436                 }
 437         }
 438
 439         /**
 440          * Check if the item array is a duplicate
 441          *
 442          * @param array $item
 443          * @return boolean is it a duplicate?
 444          */
 445         private static function isDuplicate(array $item)
 446         {
 447                 // Checking if there is already an item with the same guid
 448                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 449                 if (Post::exists($condition)) {
 450                         Logger::notice('Found already existing item', [
 451                                 'guid' => $item['guid'],
 452                                 'uid' => $item['uid'],
 453                                 'network' => $item['network']
 454                         ]);
 455                         return true;
 456                 }
 457
 458                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'],
 459                         'network' => [$item['network'], Protocol::DFRN]];
 460                 if (Post::exists($condition)) {
 461                         Logger::notice('duplicated item with the same uri found.', $item);
 462                         return true;
 463                 }
 464
 465                 // On Friendica and Diaspora the GUID is unique
 466                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 467                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 468                         if (Post::exists($condition)) {
 469                                 Logger::notice('duplicated item with the same guid found.', $item);
 470                                 return true;
 471                         }
 472                 } elseif ($item['network'] == Protocol::OSTATUS) {
 473                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 474                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 475                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 476                         if (Post::exists($condition)) {
 477                                 Logger::notice('duplicated item with the same body found.', $item);
 478                                 return true;
 479                         }
 480                 }
 481
 482                 /*
 483                  * Check for already added items.
 484                  * There is a timing issue here that sometimes creates double postings.
 485                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 486                  */
 487                 if (($item['uid'] == 0) && Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
 488                         Logger::notice('Global item already stored.', ['uri-id' => $item['uri-id'], 'network' => $item['network']]);
 489                         return true;
 490                 }
 491
 492                 return false;
 493         }
 494
 495         /**
 496          * Check if the item array is valid
 497          *
 498          * @param array $item
 499          * @return boolean item is valid
 500          */
 501         public static function isValid(array $item)
 502         {
 503                 // When there is no content then we don't post it
 504                 if ($item['body'] . $item['title'] == '') {
 505                         Logger::notice('No body, no title.');
 506                         return false;
 507                 }
 508
 509                 if (!empty($item['uid'])) {
 510                         $owner = User::getOwnerDataById($item['uid'], false);
 511                         if (!$owner) {
 512                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 513                                 return false;
 514                         }
 515
 516                         if ($owner['account_expired'] || $owner['account_removed']) {
 517                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 518                                 return false;
 519                         }
 520                 }
 521
 522                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 523                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 524                         return false;
 525                 }
 526
 527                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 528                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 529                         return false;
 530                 }
 531
 532                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 533                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 534                         return false;
 535                 }
 536
 537                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 538                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 539                         return false;
 540                 }
 541
 542                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 543                         return false;
 544                 }
 545
 546                 if ($item['verb'] == Activity::FOLLOW) {
 547                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 548                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 549                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 550                                 return false;
 551                         }
 552
 553                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 554                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 555                         if (Post::exists($condition)) {
 556                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 557                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 558                                 return false;
 559                         }
 560                 }
 561
 562                 return true;
 563         }
 564
 565         /**
 566          * Check if the item array is too old
 567          *
 568          * @param array $item
 569          * @return boolean item is too old
 570          */
 571         public static function isTooOld(array $item)
 572         {
 573                 // check for create date and expire time
 574                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 575
 576                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 577                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 578                         $expire_interval = $user['expire'];
 579                 }
 580
 581                 if (($expire_interval > 0) && !empty($item['created'])) {
 582                         $expire_date = time() - ($expire_interval * 86400);
 583                         $created_date = strtotime($item['created']);
 584                         if ($created_date < $expire_date) {
 585                                 Logger::notice('Item created before expiration interval.', [
 586                                         'created' => date('c', $created_date),
 587                                         'expired' => date('c', $expire_date),
 588                                         '$item' => $item
 589                                 ]);
 590                                 return true;
 591                         }
 592                 }
 593
 594                 return false;
 595         }
 596
 597         /**
 598          * Return the id of the given item array if it has been stored before
 599          *
 600          * @param array $item
 601          * @return integer item id
 602          */
 603         private static function getDuplicateID(array $item)
 604         {
 605                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 606                         $condition = ["`uri-id` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 607                                 $item['uri-id'], $item['uid'],
 608                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 609                         $existing = Post::selectFirst(['id', 'network'], $condition);
 610                         if (DBA::isResult($existing)) {
 611                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 612                                 if ($item['uid'] != 0) {
 613                                         Logger::notice('Item already existed for user', [
 614                                                 'uri-id' => $item['uri-id'],
 615                                                 'uid' => $item['uid'],
 616                                                 'network' => $item['network'],
 617                                                 'existing_id' => $existing["id"],
 618                                                 'existing_network' => $existing["network"]
 619                                         ]);
 620                                 }
 621
 622                                 return $existing["id"];
 623                         }
 624                 }
 625                 return 0;
 626         }
 627
 628         /**
 629          * Fetch top-level parent data for the given item array
 630          *
 631          * @param array $item
 632          * @return array item array with parent data
 633          * @throws \Exception
 634          */
 635         private static function getTopLevelParent(array $item)
 636         {
 637                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 638                         'uri-id', 'parent-uri-id',
 639                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 640                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 641                 $condition = ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']];
 642                 $params = ['order' => ['id' => false]];
 643                 $parent = Post::selectFirst($fields, $condition, $params);
 644
 645                 if (!DBA::isResult($parent)) {
 646                         Logger::notice('item parent was not found - ignoring item', ['thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 647                         return [];
 648                 }
 649
 650                 if ($parent['uri-id'] == $parent['parent-uri-id']) {
 651                         return $parent;
 652                 }
 653
 654                 $condition = ['uri-id' => $parent['parent-uri-id'],
 655                         'parent-uri-id' => $parent['parent-uri-id'],
 656                         'uid' => $parent['uid']];
 657                 $params = ['order' => ['id' => false]];
 658                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 659                 if (!DBA::isResult($toplevel_parent)) {
 660                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri-id' => $parent['parent-uri-id'], 'uid' => $parent['uid']]);
 661                         return [];
 662                 }
 663
 664                 return $toplevel_parent;
 665         }
 666
 667         /**
 668          * Get the gravity for the given item array
 669          *
 670          * @param array $item
 671          * @return integer gravity
 672          */
 673         private static function getGravity(array $item)
 674         {
 675                 $activity = DI::activity();
 676
 677                 if (isset($item['gravity'])) {
 678                         return intval($item['gravity']);
 679                 } elseif ($item['parent-uri-id'] === $item['uri-id']) {
 680                         return GRAVITY_PARENT;
 681                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 682                         return GRAVITY_COMMENT;
 683                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 684                         return GRAVITY_ACTIVITY;
 685                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 686                         return GRAVITY_ACTIVITY;
 687                 }
 688                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 689                 return GRAVITY_UNKNOWN;   // Should not happen
 690         }
 691
 692         public static function insert($item, $notify = false, $dontcache = false)
 693         {
 694                 $orig_item = $item;
 695
 696                 $priority = PRIORITY_HIGH;
 697
 698                 // If it is a posting where users should get notifications, then define it as wall posting
 699                 if ($notify) {
 700                         $item['wall'] = 1;
 701                         $item['origin'] = 1;
 702                         $item['network'] = Protocol::DFRN;
 703                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 704                         $item['direction'] = Conversation::PUSH;
 705
 706                         if (in_array($notify, PRIORITIES)) {
 707                                 $priority = $notify;
 708                         }
 709                 } else {
 710                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 711                 }
 712
 713                 $uid = intval($item['uid']);
 714
 715                 $item['guid'] = self::guid($item, $notify);
 716                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 717
 718                 // Store URI data
 719                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 720
 721                 // Backward compatibility: parent-uri used to be the direct parent uri.
 722                 // If it is provided without a thr-parent, it probably is the old behavior.
 723                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 724                 $item['parent-uri'] = $item['thr-parent'];
 725
 726                 $item['thr-parent-id'] = $item['parent-uri-id'] = ItemURI::getIdByURI($item['thr-parent']);
 727
 728                 // Store conversation data
 729                 $item = Conversation::insert($item);
 730
 731                 /*
 732                  * Do we already have this item?
 733                  * We have to check several networks since Friendica posts could be repeated
 734                  * via OStatus (maybe Diasporsa as well)
 735                  */
 736                 $duplicate = self::getDuplicateID($item);
 737                 if ($duplicate) {
 738                         return $duplicate;
 739                 }
 740
 741                 // Additional duplicate checks
 742                 /// @todo Check why the first duplication check returns the item number and the second a 0
 743                 if (self::isDuplicate($item)) {
 744                         return 0;
 745                 }
 746
 747                 $item['wall']          = intval($item['wall'] ?? 0);
 748                 $item['extid']         = trim($item['extid'] ?? '');
 749                 $item['author-name']   = trim($item['author-name'] ?? '');
 750                 $item['author-link']   = trim($item['author-link'] ?? '');
 751                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 752                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 753                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 754                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 755                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 756                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 757                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 758                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 759                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 760                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 761                 $item['location']      = trim($item['location'] ?? '');
 762                 $item['coord']         = trim($item['coord'] ?? '');
 763                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 764                 $item['deleted']       = 0;
 765                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
 766                 $item['verb']          = trim($item['verb'] ?? '');
 767                 $item['object-type']   = trim($item['object-type'] ?? '');
 768                 $item['object']        = trim($item['object'] ?? '');
 769                 $item['target-type']   = trim($item['target-type'] ?? '');
 770                 $item['target']        = trim($item['target'] ?? '');
 771                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 772                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 773                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 774                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 775                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 776                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 777                 $item['body']          = trim($item['body'] ?? '');
 778                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 779                 $item['app']           = trim($item['app'] ?? '');
 780                 $item['origin']        = intval($item['origin'] ?? 0);
 781                 $item['postopts']      = trim($item['postopts'] ?? '');
 782                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 783                 $item['event-id']      = intval($item['event-id'] ?? 0);
 784                 $item['inform']        = trim($item['inform'] ?? '');
 785                 $item['file']          = trim($item['file'] ?? '');
 786
 787                 // Items cannot be stored before they happen ...
 788                 if ($item['created'] > DateTimeFormat::utcNow()) {
 789                         $item['created'] = DateTimeFormat::utcNow();
 790                 }
 791
 792                 // We haven't invented time travel by now.
 793                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 794                         $item['edited'] = DateTimeFormat::utcNow();
 795                 }
 796
 797                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 798
 799                 $item['gravity'] = self::getGravity($item);
 800
 801                 $item['language'] = self::getLanguage($item);
 802
 803                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 804                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 805                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 806
 807                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 808                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 809                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 810
 811                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 812                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 813                         $item['post-type'] = self::PT_FOLLOWER;
 814                 }
 815
 816                 // Ensure that there is an avatar cache
 817                 Contact::checkAvatarCache($item['author-id']);
 818                 Contact::checkAvatarCache($item['owner-id']);
 819
 820                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 821                 $item["contact-id"] = self::contactId($item);
 822
 823                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 824                         self::isTooOld($item)) {
 825                         Logger::info('Item is too old', ['item' => $item]);
 826                         return 0;
 827                 }
 828
 829                 if (!self::isValid($item)) {
 830                         return 0;
 831                 }
 832
 833                 if ($item['gravity'] !== GRAVITY_PARENT) {
 834                         $toplevel_parent = self::getTopLevelParent($item);
 835                         if (empty($toplevel_parent)) {
 836                                 return 0;
 837                         }
 838
 839                         // If the thread originated from this node, we check the permission against the thread starter
 840                         $condition = ['uri-id' => $toplevel_parent['uri-id'], 'wall' => true];
 841                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 842                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 843                                 return 0;
 844                         }
 845
 846                         $parent_id             = $toplevel_parent['id'];
 847                         $item['parent-uri']    = $toplevel_parent['uri'];
 848                         $item['parent-uri-id'] = $toplevel_parent['uri-id'];
 849                         $item['deleted']       = $toplevel_parent['deleted'];
 850                         $item['allow_cid']     = $toplevel_parent['allow_cid'];
 851                         $item['allow_gid']     = $toplevel_parent['allow_gid'];
 852                         $item['deny_cid']      = $toplevel_parent['deny_cid'];
 853                         $item['deny_gid']      = $toplevel_parent['deny_gid'];
 854                         $parent_origin         = $toplevel_parent['origin'];
 855
 856                         // Don't federate received participation messages
 857                         if ($item['verb'] != Activity::FOLLOW) {
 858                                 $item['wall'] = $toplevel_parent['wall'];
 859                         } else {
 860                                 $item['wall'] = false;
 861                                 // Participations are technical messages, so they are set to "seen" automatically
 862                                 $item['unseen'] = false;
 863                         }
 864
 865                         /*
 866                          * If the parent is private, force privacy for the entire conversation
 867                          * This differs from the above settings as it subtly allows comments from
 868                          * email correspondents to be private even if the overall thread is not.
 869                          */
 870                         if ($toplevel_parent['private']) {
 871                                 $item['private'] = $toplevel_parent['private'];
 872                         }
 873
 874                         /*
 875                          * Edge case. We host a public forum that was originally posted to privately.
 876                          * The original author commented, but as this is a comment, the permissions
 877                          * weren't fixed up so it will still show the comment as private unless we fix it here.
 878                          */
 879                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
 880                                 $item['private'] = self::PUBLIC;
 881                         }
 882
 883                         // If its a post that originated here then tag the thread as "mention"
 884                         if ($item['origin'] && $item['uid']) {
 885                                 DBA::update('post-thread-user', ['mention' => true], ['uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 886                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'parent-uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 887                         }
 888
 889                         // Update the contact relations
 890                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 891                 } else {
 892                         $parent_id = 0;
 893                         $parent_origin = $item['origin'];
 894                 }
 895
 896                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
 897                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
 898
 899                 // Is this item available in the global items (with uid=0)?
 900                 if ($item["uid"] == 0) {
 901                         $item["global"] = true;
 902
 903                         // Set the global flag on all items if this was a global item entry
 904                         Post::update(['global' => true], ['uri-id' => $item['uri-id']]);
 905                 } else {
 906                         $item['global'] = Post::exists(['uid' => 0, 'uri-id' => $item['uri-id']]);
 907                 }
 908
 909                 // ACL settings
 910                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
 911                         $item["private"] = self::PRIVATE;
 912                 }
 913
 914                 if ($notify) {
 915                         $item['edit'] = false;
 916                         $item['parent'] = $parent_id;
 917                         Hook::callAll('post_local', $item);
 918                 } else {
 919                         Hook::callAll('post_remote', $item);
 920                 }
 921
 922                 if (!empty($item['cancel'])) {
 923                         Logger::log('post cancelled by addon.');
 924                         return 0;
 925                 }
 926
 927                 if (empty($item['vid']) && !empty($item['verb'])) {
 928                         $item['vid'] = Verb::getID($item['verb']);
 929                 }
 930
 931                 // Creates or assigns the permission set
 932                 $item['psid'] = PermissionSet::getIdFromACL(
 933                         $item['uid'],
 934                         $item['allow_cid'],
 935                         $item['allow_gid'],
 936                         $item['deny_cid'],
 937                         $item['deny_gid']
 938                 );
 939
 940                 if (!empty($item['extid'])) {
 941                         $item['external-id'] = ItemURI::getIdByURI($item['extid']);
 942                 }
 943
 944                 if ($item['verb'] == Activity::ANNOUNCE) {
 945                         self::setOwnerforResharedItem($item);
 946                 }
 947
 948                 // Remove all media attachments from the body and store them in the post-media table
 949                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
 950                 $item['raw-body'] = self::setHashtags($item['raw-body']);
 951
 952                 // Check for hashtags in the body and repair or add hashtag links
 953                 $item['body'] = self::setHashtags($item['body']);
 954
 955                 // Fill the cache field
 956                 self::putInCache($item);
 957
 958                 if (stristr($item['verb'], Activity::POKE)) {
 959                         $notify_type = Delivery::POKE;
 960                 } else {
 961                         $notify_type = Delivery::POST;
 962                 }
 963
 964                 // Filling item related side tables
 965                 if (!empty($item['attach'])) {
 966                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
 967                 }
 968
 969                 if (empty($item['event-id'])) {
 970                         unset($item['event-id']);
 971                 }
 972
 973                 Post::insert($item['uri-id'], $item);
 974
 975                 if ($item['gravity'] == GRAVITY_PARENT) {
 976                         Post\Thread::insert($item['uri-id'], $item);
 977                 }
 978
 979                 if (!in_array($item['verb'], self::ACTIVITIES)) {
 980                         Post\Content::insert($item['uri-id'], $item);
 981                 }
 982
 983                 // Diaspora signature
 984                 if (!empty($item['diaspora_signed_text'])) {
 985                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
 986                 }
 987
 988                 // Attached file links
 989                 if (!empty($item['file'])) {
 990                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
 991                 }
 992
 993                 // Delivery relevant data
 994                 $delivery_data = Post\DeliveryData::extractFields($item);
 995
 996                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
 997                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
 998                 }
 999
1000                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1001                 if (!Tag::existsForPost($item['uri-id'])) {
1002                         Tag::storeFromBody($item['uri-id'], $item['body']);
1003                 }
1004
1005                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid']];
1006                 if (Post::exists($condition)) {
1007                         Logger::notice('Item is already inserted - aborting', $condition);
1008                         return 0;
1009                 }
1010
1011                 $post_user_id = Post\User::insert($item['uri-id'], $item['uid'], $item);
1012                 if (!$post_user_id) {
1013                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1014                         return 0;
1015                 }
1016
1017                 if ($item['gravity'] == GRAVITY_PARENT) {
1018                         $item['post-user-id'] = $post_user_id;
1019                         Post\ThreadUser::insert($item['uri-id'], $item['uid'], $item);
1020                 }
1021
1022                 Logger::notice('created item', ['post-id' => $post_user_id, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1023
1024                 $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['post-user-id' => $post_user_id]);
1025                 if (!DBA::isResult($posted_item)) {
1026                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1027                         Logger::warning('Could not store item. it will be spooled', ['id' => $post_user_id]);
1028                         self::spool($orig_item);
1029                         return 0;
1030                 }
1031
1032                 // update the commented timestamp on the parent
1033                 if (DI::config()->get('system', 'like_no_comment')) {
1034                         // Update when it is a comment
1035                         $update_commented = in_array($posted_item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1036                 } else {
1037                         // Update when it isn't a follow or tag verb
1038                         $update_commented = !in_array($posted_item['verb'], [Activity::FOLLOW, Activity::TAG]);
1039                 }
1040
1041                 if ($update_commented) {
1042                         $fields = ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
1043                 } else {
1044                         $fields = ['changed' => DateTimeFormat::utcNow()];
1045                 }
1046
1047                 Post::update($fields, ['uri-id' => $posted_item['parent-uri-id'], 'uid' => $posted_item['uid']]);
1048
1049                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1050                 if (self::tagDeliver($posted_item['uid'], $post_user_id)) {
1051                         // Get the user information for the logging
1052                         $user = User::getById($uid);
1053
1054                         Logger::notice('Item had been deleted', ['id' => $post_user_id, 'user' => $uid, 'account-type' => $user['account-type']]);
1055                         return 0;
1056                 }
1057
1058                 if (!$dontcache) {
1059                         if ($notify) {
1060                                 Hook::callAll('post_local_end', $posted_item);
1061                         } else {
1062                                 Hook::callAll('post_remote_end', $posted_item);
1063                         }
1064                 }
1065
1066                 if ($posted_item['gravity'] === GRAVITY_PARENT) {
1067                         self::addShadow($post_user_id);
1068                 } else {
1069                         self::addShadowPost($post_user_id);
1070                 }
1071
1072                 self::updateContact($posted_item);
1073
1074                 Post\UserNotification::setNotification($posted_item['uri-id'], $posted_item['uid']);
1075
1076                 check_user_notification($posted_item['uri-id'], $posted_item['uid']);
1077
1078                 // Distribute items to users who subscribed to their tags
1079                 self::distributeByTags($posted_item);
1080
1081                 // Automatically reshare the item if the "remote_self" option is selected
1082                 self::autoReshare($posted_item);
1083
1084                 $transmit = $notify || ($posted_item['visible'] && ($parent_origin || $posted_item['origin']));
1085
1086                 if ($transmit) {
1087                         // Don't relay participation messages
1088                         if (($posted_item['verb'] == Activity::FOLLOW) &&
1089                                 (!$posted_item['origin'] || ($posted_item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1090                                 Logger::info('Participation messages will not be relayed', ['item' => $posted_item['id'], 'uri' => $posted_item['uri'], 'verb' => $posted_item['verb']]);
1091                                 $transmit = false;
1092                         }
1093                 }
1094
1095                 if ($transmit) {
1096                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, (int)$posted_item['uri-id'], (int)$posted_item['uid']);
1097                 }
1098
1099                 return $post_user_id;
1100         }
1101
1102         /**
1103          * Change the owner of a parent item if it had been shared by a forum
1104          *
1105          * (public) forum posts in the new format consist of the regular post by the author
1106          * followed by an announce message sent from the forum account.
1107          * Changing the owner helps in grouping forum posts.
1108          *
1109          * @param array $item
1110          * @return void
1111          */
1112         private static function setOwnerforResharedItem(array $item)
1113         {
1114                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-type'],
1115                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1116                 if (!DBA::isResult($parent)) {
1117                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1118                         return;
1119                 }
1120
1121                 $author = Contact::selectFirst(['url', 'contact-type', 'network'], ['id' => $item['author-id']]);
1122                 if (!DBA::isResult($author)) {
1123                         Logger::error('Author not found', ['id' => $item['author-id']]);
1124                         return;
1125                 }
1126
1127                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1128                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1129                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid'], 'cid' => $cid]);
1130                         return;
1131                 }
1132
1133                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1134                         if ($parent['post-type'] == self::PT_ANNOUNCEMENT) {
1135                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1136                                 return;
1137                         }
1138
1139                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1140                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1141                                 return;
1142                         }
1143                         self::update(['post-type' => self::PT_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1144                         Logger::info('Set announcement post-type', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1145                         return;
1146                 }
1147
1148                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1149                 Logger::info('Change owner of the parent', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid'], 'owner-id' => $item['author-id'], 'contact-id' => $cid]);
1150         }
1151
1152         /**
1153          * Distribute the given item to users who subscribed to their tags
1154          *
1155          * @param array $item     Processed item
1156          */
1157         private static function distributeByTags(array $item)
1158         {
1159                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1160                         return;
1161                 }
1162
1163                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1164                 foreach ($uids as $uid) {
1165                         if (Contact::isSharing($item['author-id'], $uid)) {
1166                                 $fields = [];
1167                         } else {
1168                                 $fields = ['post-type' => self::PT_TAG];
1169                         }
1170
1171                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1172                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1173                 }
1174         }
1175
1176         /**
1177          * Distributes public items to the receivers
1178          *
1179          * @param integer $itemid      Item ID that should be added
1180          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1181          * @throws \Exception
1182          */
1183         public static function distribute($itemid, $signed_text = '')
1184         {
1185                 $condition = ["`id` IN (SELECT `parent` FROM `post-user-view` WHERE `id` = ?)", $itemid];
1186                 $parent = Post::selectFirst(['owner-id'], $condition);
1187                 if (!DBA::isResult($parent)) {
1188                         Logger::warning('Item not found', ['condition' => $condition]);
1189                         return;
1190                 }
1191
1192                 // Only distribute public items from native networks
1193                 $condition = ['id' => $itemid, 'uid' => 0,
1194                         'network' => array_merge(Protocol::FEDERATED ,['']),
1195                         'visible' => true, 'deleted' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1196                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1197                 if (!DBA::isResult($item)) {
1198                         Logger::warning('Item not found', ['condition' => $condition]);
1199                         return;
1200                 }
1201
1202                 $origin = $item['origin'];
1203
1204                 $users = [];
1205
1206                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1207                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1208                 if (!DBA::isResult($owner)) {
1209                         return;
1210                 }
1211
1212                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1213                 $contacts = DBA::select('contact', ['uid'], $condition);
1214                 while ($contact = DBA::fetch($contacts)) {
1215                         if ($contact['uid'] == 0) {
1216                                 continue;
1217                         }
1218
1219                         $users[$contact['uid']] = $contact['uid'];
1220                 }
1221                 DBA::close($contacts);
1222
1223                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1224                 $contacts = DBA::select('contact', ['uid'], $condition);
1225                 while ($contact = DBA::fetch($contacts)) {
1226                         if ($contact['uid'] == 0) {
1227                                 continue;
1228                         }
1229
1230                         $users[$contact['uid']] = $contact['uid'];
1231                 }
1232                 DBA::close($contacts);
1233
1234                 if (!empty($owner['alias'])) {
1235                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1236                         $contacts = DBA::select('contact', ['uid'], $condition);
1237                         while ($contact = DBA::fetch($contacts)) {
1238                                 if ($contact['uid'] == 0) {
1239                                         continue;
1240                                 }
1241
1242                                 $users[$contact['uid']] = $contact['uid'];
1243                         }
1244                         DBA::close($contacts);
1245                 }
1246
1247                 $origin_uid = 0;
1248
1249                 if ($item['uri-id'] != $item['parent-uri-id']) {
1250                         $parents = Post::select(['uid', 'origin'], ["`uri-id` = ? AND `uid` != 0", $item['parent-uri-id']]);
1251                         while ($parent = Post::fetch($parents)) {
1252                                 $users[$parent['uid']] = $parent['uid'];
1253                                 if ($parent['origin'] && !$origin) {
1254                                         $origin_uid = $parent['uid'];
1255                                 }
1256                         }
1257                         DBA::close($parents);
1258                 }
1259
1260                 foreach ($users as $uid) {
1261                         if ($origin_uid == $uid) {
1262                                 $item['diaspora_signed_text'] = $signed_text;
1263                         }
1264                         self::storeForUser($item, $uid);
1265                 }
1266         }
1267
1268         /**
1269          * Store a public item defined by their URI-ID for the given users
1270          *
1271          * @param integer $uri_id URI-ID of the given item
1272          * @param integer $uid    The user that will receive the item entry
1273          * @param array   $fields Additional fields to be stored
1274          * @return integer stored item id
1275          */
1276         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1277         {
1278                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1279                 if (!DBA::isResult($item)) {
1280                         return 0;
1281                 }
1282
1283                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1284                         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']]);
1285                         return 0;
1286                 }
1287
1288                 $item['post-type'] = self::PT_STORED;
1289
1290                 $item = array_merge($item, $fields);
1291
1292                 $stored = self::storeForUser($item, $uid);
1293                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1294                 return $stored;
1295         }
1296
1297         /**
1298          * Store a public item array for the given users
1299          *
1300          * @param array   $item   The item entry that will be stored
1301          * @param integer $uid    The user that will receive the item entry
1302          * @return integer stored item id
1303          * @throws \Exception
1304          */
1305         private static function storeForUser(array $item, int $uid)
1306         {
1307                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1308                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1309                         return 0;
1310                 }
1311
1312                 unset($item['id']);
1313                 unset($item['parent']);
1314                 unset($item['mention']);
1315                 unset($item['starred']);
1316                 unset($item['unseen']);
1317                 unset($item['psid']);
1318
1319                 $item['uid'] = $uid;
1320                 $item['origin'] = 0;
1321                 $item['wall'] = 0;
1322
1323                 if ($item['gravity'] == GRAVITY_PARENT) {
1324                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1325                 } else {
1326                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1327                 }
1328
1329                 if (!empty($contact['id'])) {
1330                         $item['contact-id'] = $contact['id'];
1331                 } else {
1332                         // Shouldn't happen at all
1333                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1334                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1335                         if (!DBA::isResult($self)) {
1336                                 // Shouldn't happen even less
1337                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1338                                 return 0;
1339                         }
1340                         $item['contact-id'] = $self['id'];
1341                 }
1342
1343                 /// @todo Handling of "event-id"
1344
1345                 $notify = false;
1346                 if ($item['gravity'] == GRAVITY_PARENT) {
1347                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1348                         if (DBA::isResult($contact)) {
1349                                 $notify = self::isRemoteSelf($contact, $item);
1350                         }
1351                 }
1352
1353                 $distributed = self::insert($item, $notify, true);
1354
1355                 if (!$distributed) {
1356                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1357                 } else {
1358                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1359                 }
1360                 return $distributed;
1361         }
1362
1363         /**
1364          * Add a shadow entry for a given item id that is a thread starter
1365          *
1366          * We store every public item entry additionally with the user id "0".
1367          * This is used for the community page and for the search.
1368          * It is planned that in the future we will store public item entries only once.
1369          *
1370          * @param integer $itemid Item ID that should be added
1371          * @throws \Exception
1372          */
1373         private static function addShadow($itemid)
1374         {
1375                 $fields = ['uid', 'private', 'visible', 'deleted', 'network', 'uri-id'];
1376                 $condition = ['id' => $itemid, 'gravity' => GRAVITY_PARENT];
1377                 $item = Post::selectFirst($fields, $condition);
1378
1379                 if (!DBA::isResult($item)) {
1380                         return;
1381                 }
1382
1383                 // is it already a copy?
1384                 if (($itemid == 0) || ($item['uid'] == 0)) {
1385                         return;
1386                 }
1387
1388                 // Is it a visible public post?
1389                 if (!$item["visible"] || $item["deleted"]  || ($item["private"] == self::PRIVATE)) {
1390                         return;
1391                 }
1392
1393                 // is it an entry from a connector? Only add an entry for natively connected networks
1394                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1395                         return;
1396                 }
1397
1398                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1399                         return;
1400                 }
1401
1402                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1403
1404                 if (DBA::isResult($item)) {
1405                         // Preparing public shadow (removing user specific data)
1406                         $item['uid'] = 0;
1407                         unset($item['id']);
1408                         unset($item['parent']);
1409                         unset($item['wall']);
1410                         unset($item['mention']);
1411                         unset($item['origin']);
1412                         unset($item['starred']);
1413                         unset($item['postopts']);
1414                         unset($item['inform']);
1415                         unset($item['post-type']);
1416                         if ($item['uri-id'] == $item['parent-uri-id']) {
1417                                 $item['contact-id'] = $item['owner-id'];
1418                         } else {
1419                                 $item['contact-id'] = $item['author-id'];
1420                         }
1421
1422                         $public_shadow = self::insert($item, false, true);
1423
1424                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1425                 }
1426         }
1427
1428         /**
1429          * Add a shadow entry for a given item id that is a comment
1430          *
1431          * This function does the same like the function above - but for comments
1432          *
1433          * @param integer $itemid Item ID that should be added
1434          * @throws \Exception
1435          */
1436         private static function addShadowPost($itemid)
1437         {
1438                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1439                 if (!DBA::isResult($item)) {
1440                         return;
1441                 }
1442
1443                 // Is it a toplevel post?
1444                 if ($item['gravity'] == GRAVITY_PARENT) {
1445                         self::addShadow($itemid);
1446                         return;
1447                 }
1448
1449                 // Is this a shadow entry?
1450                 if ($item['uid'] == 0) {
1451                         return;
1452                 }
1453
1454                 // Is there a shadow parent?
1455                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
1456                         return;
1457                 }
1458
1459                 // Is there already a shadow entry?
1460                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1461                         return;
1462                 }
1463
1464                 // Save "origin" and "parent" state
1465                 $origin = $item['origin'];
1466                 $parent = $item['parent'];
1467
1468                 // Preparing public shadow (removing user specific data)
1469                 $item['uid'] = 0;
1470                 unset($item['id']);
1471                 unset($item['parent']);
1472                 unset($item['wall']);
1473                 unset($item['mention']);
1474                 unset($item['origin']);
1475                 unset($item['starred']);
1476                 unset($item['postopts']);
1477                 unset($item['inform']);
1478                 unset($item['post-type']);
1479                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1480
1481                 $public_shadow = self::insert($item, false, true);
1482
1483                 Logger::info('Stored public shadow', ['uri-id' => $item['uri-id'], 'id' => $public_shadow]);
1484
1485                 // If this was a comment to a Diaspora post we don't get our comment back.
1486                 // This means that we have to distribute the comment by ourselves.
1487                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1488                         self::distribute($public_shadow);
1489                 }
1490         }
1491
1492         /**
1493          * Adds a language specification in a "language" element of given $arr.
1494          * Expects "body" element to exist in $arr.
1495          *
1496          * @param array $item
1497          * @return string detected language
1498          * @throws \Text_LanguageDetect_Exception
1499          */
1500         private static function getLanguage(array $item)
1501         {
1502                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1503                         return '';
1504                 }
1505
1506                 // Convert attachments to links
1507                 $naked_body = BBCode::removeAttachment($item['body']);
1508                 if (empty($naked_body)) {
1509                         return '';
1510                 }
1511
1512                 // Remove links and pictures
1513                 $naked_body = BBCode::removeLinks($naked_body);
1514
1515                 // Convert the title and the body to plain text
1516                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1517
1518                 // Remove possibly remaining links
1519                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1520
1521                 if (empty($naked_body)) {
1522                         return '';
1523                 }
1524
1525                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1526                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1527                 if (is_array($languages)) {
1528                         return json_encode($languages);
1529                 }
1530
1531                 return '';
1532         }
1533
1534         public static function getLanguageMessage(array $item)
1535         {
1536                 $iso639 = new \Matriphe\ISO639\ISO639;
1537
1538                 $used_languages = '';
1539                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1540                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1541                 }
1542                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1543                 return $used_languages;
1544         }
1545
1546         /**
1547          * Creates an unique guid out of a given uri
1548          *
1549          * @param string $uri uri of an item entry
1550          * @param string $host hostname for the GUID prefix
1551          * @return string unique guid
1552          */
1553         public static function guidFromUri($uri, $host)
1554         {
1555                 // Our regular guid routine is using this kind of prefix as well
1556                 // We have to avoid that different routines could accidentally create the same value
1557                 $parsed = parse_url($uri);
1558
1559                 // We use a hash of the hostname as prefix for the guid
1560                 $guid_prefix = hash("crc32", $host);
1561
1562                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1563                 unset($parsed["scheme"]);
1564
1565                 // Glue it together to be able to make a hash from it
1566                 $host_id = implode("/", $parsed);
1567
1568                 // We could use any hash algorithm since it isn't a security issue
1569                 $host_hash = hash("ripemd128", $host_id);
1570
1571                 return $guid_prefix.$host_hash;
1572         }
1573
1574         /**
1575          * generate an unique URI
1576          *
1577          * @param integer $uid  User id
1578          * @param string  $guid An existing GUID (Otherwise it will be generated)
1579          *
1580          * @return string
1581          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1582          */
1583         public static function newURI($uid, $guid = "")
1584         {
1585                 if ($guid == "") {
1586                         $guid = System::createUUID();
1587                 }
1588
1589                 return DI::baseUrl()->get() . '/objects/' . $guid;
1590         }
1591
1592         /**
1593          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1594          *
1595          * This can be used to filter for inactive contacts.
1596          * Only do this for public postings to avoid privacy problems, since poco data is public.
1597          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1598          *
1599          * @param array $arr Contains the just posted item record
1600          * @throws \Exception
1601          */
1602         private static function updateContact($arr)
1603         {
1604                 // Unarchive the author
1605                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1606                 if (DBA::isResult($contact)) {
1607                         Contact::unmarkForArchival($contact);
1608                 }
1609
1610                 // Unarchive the contact if it's not our own contact
1611                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1612                 if (DBA::isResult($contact)) {
1613                         Contact::unmarkForArchival($contact);
1614                 }
1615
1616                 /// @todo On private posts we could obfuscate the date
1617                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1618
1619                 // Is it a forum? Then we don't care about the rules from above
1620                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri-id"] === $arr["uri-id"])) {
1621                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1622                                 $update = true;
1623                         }
1624                 }
1625
1626                 if ($update) {
1627                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1628                         // So we have to ensure to only update the last item when it had been our own post,
1629                         // or it had been done by a "regular" contact.
1630                         if (!empty($arr['wall'])) {
1631                                 $condition = ['id' => $arr['contact-id']];
1632                         } else {
1633                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1634                         }
1635                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1636                 }
1637                 // Now do the same for the system wide contacts with uid=0
1638                 if ($arr['private'] != self::PRIVATE) {
1639                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1640                                 ['id' => $arr['owner-id']]);
1641
1642                         if ($arr['owner-id'] != $arr['author-id']) {
1643                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1644                                         ['id' => $arr['author-id']]);
1645                         }
1646                 }
1647         }
1648
1649         public static function setHashtags($body)
1650         {
1651                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1652                         $tags = BBCode::getTags($body);
1653
1654                         // No hashtags?
1655                         if (!count($tags)) {
1656                                 return $body;
1657                         }
1658
1659                         // This sorting is important when there are hashtags that are part of other hashtags
1660                         // Otherwise there could be problems with hashtags like #test and #test2
1661                         // Because of this we are sorting from the longest to the shortest tag.
1662                         usort($tags, function ($a, $b) {
1663                                 return strlen($b) <=> strlen($a);
1664                         });
1665
1666                         $URLSearchString = "^\[\]";
1667
1668                         // All hashtags should point to the home server if "local_tags" is activated
1669                         if (DI::config()->get('system', 'local_tags')) {
1670                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1671                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1672                         }
1673
1674                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1675                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1676                                 function ($match) {
1677                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1678                                 }, $body);
1679
1680                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1681                                 function ($match) {
1682                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1683                                 }, $body);
1684
1685                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1686                                 function ($match) {
1687                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1688                                 }, $body);
1689
1690                         // Repair recursive urls
1691                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1692                                 "&num;$2", $body);
1693
1694                         foreach ($tags as $tag) {
1695                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1696                                         continue;
1697                                 }
1698
1699                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1700                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1701
1702                                 $body = str_replace($tag, $newtag, $body);
1703                         }
1704
1705                         // Convert back the masked hashtags
1706                         $body = str_replace("&num;", "#", $body);
1707
1708                         return $body;
1709                 });
1710
1711                 return $body;
1712         }
1713
1714         /**
1715          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1716          *
1717          * @param int $uid
1718          * @param int $item_id
1719          * @return boolean true if item was deleted, else false
1720          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1721          * @throws \ImagickException
1722          */
1723         private static function tagDeliver($uid, $item_id)
1724         {
1725                 $mention = false;
1726
1727                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1728                 if (!DBA::isResult($user)) {
1729                         return false;
1730                 }
1731
1732                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1733                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1734
1735                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1736                 if (!DBA::isResult($item)) {
1737                         return false;
1738                 }
1739
1740                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1741
1742                 /*
1743                  * Diaspora uses their own hardwired link URL in @-tags
1744                  * instead of the one we supply with webfinger
1745                  */
1746                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
1747
1748                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1749                 if ($cnt) {
1750                         foreach ($matches as $mtch) {
1751                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
1752                                         $mention = true;
1753                                         Logger::log('mention found: ' . $mtch[2]);
1754                                 }
1755                         }
1756                 }
1757
1758                 if (!$mention) {
1759                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1760                         foreach ($tags as $tag) {
1761                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
1762                                         $mention = true;
1763                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
1764                                 }
1765                         }
1766                 }
1767
1768                 if (!$mention) {
1769                         if (($community_page || $prvgroup) &&
1770                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
1771                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item['id'], 'guid'=> $item['guid']]);
1772                                 Post\User::delete(['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1773                                 return true;
1774                         }
1775                         return false;
1776                 }
1777
1778                 $arr = ['item' => $item, 'user' => $user];
1779
1780                 Hook::callAll('tagged', $arr);
1781
1782                 if (!$community_page && !$prvgroup) {
1783                         return false;
1784                 }
1785
1786                 /*
1787                  * tgroup delivery - setup a second delivery chain
1788                  * prevent delivery looping - only proceed
1789                  * if the message originated elsewhere and is a top-level post
1790                  */
1791                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
1792                         return false;
1793                 }
1794
1795                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
1796                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
1797                 if (!DBA::isResult($self)) {
1798                         return false;
1799                 }
1800
1801                 $owner_id = Contact::getIdForURL($self['url']);
1802
1803                 // also reset all the privacy bits to the forum default permissions
1804
1805                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
1806
1807                 $psid = PermissionSet::getIdFromACL(
1808                         $user['uid'],
1809                         $user['allow_cid'],
1810                         $user['allow_gid'],
1811                         $user['deny_cid'],
1812                         $user['deny_gid']
1813                 );
1814
1815                 $forum_mode = ($prvgroup ? 2 : 1);
1816
1817                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
1818                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
1819                 self::update($fields, ['id' => $item['id']]);
1820
1821                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, (int)$item['uri-id'], (int)$item['uid']);
1822
1823                 self::performActivity($item['id'], 'announce', $uid);
1824
1825                 return false;
1826         }
1827
1828         /**
1829          * Automatically reshare the item if the "remote_self" option is selected
1830          *
1831          * @param array $item
1832          * @return void
1833          */
1834         private static function autoReshare(array $item)
1835         {
1836                 if ($item['gravity'] != GRAVITY_PARENT) {
1837                         return;
1838                 }
1839
1840                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
1841                         return;
1842                 }
1843
1844                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1845                         return;
1846                 }
1847
1848                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
1849
1850                 self::performActivity($item['id'], 'announce', $item['uid']);
1851         }
1852
1853         public static function isRemoteSelf($contact, &$datarray)
1854         {
1855                 if (!$contact['remote_self']) {
1856                         return false;
1857                 }
1858
1859                 // Prevent the forwarding of posts that are forwarded
1860                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
1861                         Logger::info('Already forwarded');
1862                         return false;
1863                 }
1864
1865                 // Prevent to forward already forwarded posts
1866                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
1867                         Logger::info('Already forwarded (second test)');
1868                         return false;
1869                 }
1870
1871                 // Only forward posts
1872                 if ($datarray["verb"] != Activity::POST) {
1873                         Logger::info('No post');
1874                         return false;
1875                 }
1876
1877                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
1878                         Logger::info('Not public');
1879                         return false;
1880                 }
1881
1882                 $datarray2 = $datarray;
1883                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
1884                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
1885                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
1886                                         ['uid' => $contact['uid'], 'self' => true]);
1887                         if (DBA::isResult($self)) {
1888                                 $datarray['contact-id'] = $self["id"];
1889
1890                                 $datarray['owner-name'] = $self["name"];
1891                                 $datarray['owner-link'] = $self["url"];
1892                                 $datarray['owner-avatar'] = $self["thumb"];
1893
1894                                 $datarray['author-name']   = $datarray['owner-name'];
1895                                 $datarray['author-link']   = $datarray['owner-link'];
1896                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
1897
1898                                 unset($datarray['edited']);
1899
1900                                 unset($datarray['network']);
1901                                 unset($datarray['owner-id']);
1902                                 unset($datarray['author-id']);
1903                         }
1904
1905                         if ($contact['network'] != Protocol::FEED) {
1906                                 $old_uri_id = $datarray["uri-id"] ?? 0;
1907                                 $datarray["guid"] = System::createUUID();
1908                                 unset($datarray["plink"]);
1909                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
1910                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
1911                                 $datarray["extid"] = Protocol::DFRN;
1912                                 $urlpart = parse_url($datarray2['author-link']);
1913                                 $datarray["app"] = $urlpart["host"];
1914                                 if (!empty($old_uri_id)) {
1915                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
1916                                 }
1917
1918                                 unset($datarray["parent-uri"]);
1919                                 unset($datarray["thr-parent"]);
1920                         } else {
1921                                 $datarray['private'] = self::PUBLIC;
1922                         }
1923                 }
1924
1925                 if ($contact['network'] != Protocol::FEED) {
1926                         // Store the original post
1927                         $result = self::insert($datarray2);
1928                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
1929                 } else {
1930                         $datarray["app"] = "Feed";
1931                         $result = true;
1932                 }
1933
1934                 // Trigger automatic reactions for addons
1935                 $datarray['api_source'] = true;
1936
1937                 // We have to tell the hooks who we are - this really should be improved
1938                 $_SESSION['authenticated'] = true;
1939                 $_SESSION['uid'] = $contact['uid'];
1940
1941                 return (bool)$result;
1942         }
1943
1944         /**
1945          *
1946          * @param string $s
1947          * @param int    $uid
1948          * @param array  $item
1949          * @param int    $cid
1950          * @return string
1951          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1952          * @throws \ImagickException
1953          */
1954         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
1955         {
1956                 if (DI::config()->get('system', 'disable_embedded')) {
1957                         return $s;
1958                 }
1959
1960                 Logger::info('check for photos');
1961                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
1962
1963                 $orig_body = $s;
1964                 $new_body = '';
1965
1966                 $img_start = strpos($orig_body, '[img');
1967                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
1968                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
1969
1970                 while (($img_st_close !== false) && ($img_len !== false)) {
1971                         $img_st_close++; // make it point to AFTER the closing bracket
1972                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
1973
1974                         Logger::info('found photo', ['image' => $image]);
1975
1976                         if (stristr($image, $site . '/photo/')) {
1977                                 // Only embed locally hosted photos
1978                                 $replace = false;
1979                                 $i = basename($image);
1980                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
1981                                 $x = strpos($i, '-');
1982
1983                                 if ($x) {
1984                                         $res = substr($i, $x + 1);
1985                                         $i = substr($i, 0, $x);
1986                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
1987                                         if (DBA::isResult($photo)) {
1988                                                 /*
1989                                                  * Check to see if we should replace this photo link with an embedded image
1990                                                  * 1. No need to do so if the photo is public
1991                                                  * 2. If there's a contact-id provided, see if they're in the access list
1992                                                  *    for the photo. If so, embed it.
1993                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
1994                                                  *    permissions, regardless of order but first check to see if they're an exact
1995                                                  *    match to save some processing overhead.
1996                                                  */
1997                                                 if (self::hasPermissions($photo)) {
1998                                                         if ($cid) {
1999                                                                 $recips = self::enumeratePermissions($photo);
2000                                                                 if (in_array($cid, $recips)) {
2001                                                                         $replace = true;
2002                                                                 }
2003                                                         } elseif ($item) {
2004                                                                 if (self::samePermissions($uid, $item, $photo)) {
2005                                                                         $replace = true;
2006                                                                 }
2007                                                         }
2008                                                 }
2009                                                 if ($replace) {
2010                                                         $photo_img = Photo::getImageForPhoto($photo);
2011                                                         // If a custom width and height were specified, apply before embedding
2012                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2013                                                                 Logger::info('scaling photo');
2014
2015                                                                 $width = intval($match[1]);
2016                                                                 $height = intval($match[2]);
2017
2018                                                                 $photo_img->scaleDown(max($width, $height));
2019                                                         }
2020
2021                                                         $data = $photo_img->asString();
2022                                                         $type = $photo_img->getType();
2023
2024                                                         Logger::info('replacing photo');
2025                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2026                                                         Logger::debug('replaced', ['image' => $image]);
2027                                                 }
2028                                         }
2029                                 }
2030                         }
2031
2032                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2033                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2034                         if ($orig_body === false) {
2035                                 $orig_body = '';
2036                         }
2037
2038                         $img_start = strpos($orig_body, '[img');
2039                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2040                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2041                 }
2042
2043                 $new_body = $new_body . $orig_body;
2044
2045                 return $new_body;
2046         }
2047
2048         private static function hasPermissions($obj)
2049         {
2050                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2051                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2052         }
2053
2054         private static function samePermissions($uid, $obj1, $obj2)
2055         {
2056                 // first part is easy. Check that these are exactly the same.
2057                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2058                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2059                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2060                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2061                         return true;
2062                 }
2063
2064                 // This is harder. Parse all the permissions and compare the resulting set.
2065                 $recipients1 = self::enumeratePermissions($obj1);
2066                 $recipients2 = self::enumeratePermissions($obj2);
2067                 sort($recipients1);
2068                 sort($recipients2);
2069
2070                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2071                 return ($recipients1 == $recipients2);
2072         }
2073
2074         /**
2075          * Returns an array of contact-ids that are allowed to see this object
2076          *
2077          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2078          * @param bool  $check_dead Prunes unavailable contacts from the result
2079          * @return array
2080          * @throws \Exception
2081          */
2082         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2083         {
2084                 $aclFormater = DI::aclFormatter();
2085
2086                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2087                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2088                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2089                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2090                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2091                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2092                 $recipients   = array_diff($recipients, $deny);
2093                 return $recipients;
2094         }
2095
2096         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2097         {
2098                 if (!$uid || ($days < 1)) {
2099                         return;
2100                 }
2101
2102                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2103                         $uid, GRAVITY_PARENT];
2104
2105                 /*
2106                  * $expire_network_only = save your own wall posts
2107                  * and just expire conversations started by others
2108                  */
2109                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2110
2111                 if ($expire_network_only) {
2112                         $condition[0] .= " AND NOT `wall`";
2113                 }
2114
2115                 if ($network != "") {
2116                         $condition[0] .= " AND `network` = ?";
2117                         $condition[] = $network;
2118                 }
2119
2120                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2121                 $condition[] = $days;
2122
2123                 $items = Post::select(['resource-id', 'starred', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2124
2125                 if (!DBA::isResult($items)) {
2126                         return;
2127                 }
2128
2129                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2130
2131                 // Forcing expiring of items - but not notes and marked items
2132                 if ($force) {
2133                         $expire_items = true;
2134                 }
2135
2136                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2137                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2138                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2139
2140                 $expired = 0;
2141
2142                 $priority = DI::config()->get('system', 'expire-notify-priority');
2143
2144                 while ($item = Post::fetch($items)) {
2145                         // don't expire filed items
2146                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2147                                 continue;
2148                         }
2149
2150                         // Only expire posts, not photos and photo comments
2151
2152                         if (!$expire_photos && strlen($item['resource-id'])) {
2153                                 continue;
2154                         } elseif (!$expire_starred && intval($item['starred'])) {
2155                                 continue;
2156                         } elseif (!$expire_notes && ($item['post-type'] == self::PT_PERSONAL_NOTE)) {
2157                                 continue;
2158                         } elseif (!$expire_items && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2159                                 continue;
2160                         }
2161
2162                         self::markForDeletionById($item['id'], $priority);
2163
2164                         ++$expired;
2165                 }
2166                 DBA::close($items);
2167                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2168         }
2169
2170         public static function firstPostDate($uid, $wall = false)
2171         {
2172                 $condition = ['gravity' => GRAVITY_PARENT, 'uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true];
2173                 $params = ['order' => ['received' => false]];
2174                 $thread = Post::selectFirst(['received'], $condition, $params);
2175                 if (DBA::isResult($thread)) {
2176                         $postdate = substr(DateTimeFormat::local($thread['received']), 0, 10);
2177                         return $postdate;
2178                 }
2179                 return false;
2180         }
2181
2182         /**
2183          * add/remove activity to an item
2184          *
2185          * Toggle activities as like,dislike,attend of an item
2186          *
2187          * @param int $item_id
2188          * @param string $verb
2189          *            Activity verb. One of
2190          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2191          *            attendno, unattendno, attendmaybe, unattendmaybe,
2192          *            announce, unannouce
2193          * @return bool
2194          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2195          * @throws \ImagickException
2196          * @hook  'post_local_end'
2197          *            array $arr
2198          *            'post_id' => ID of posted item
2199          */
2200         public static function performActivity(int $item_id, string $verb, int $uid)
2201         {
2202                 if (empty($uid)) {
2203                         return false;
2204                 }
2205
2206                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2207
2208                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2209                 if (!DBA::isResult($item)) {
2210                         Logger::log('like: unknown item ' . $item_id);
2211                         return false;
2212                 }
2213
2214                 $uri_id = $item['uri-id'];
2215
2216                 if (!in_array($item['uid'], [0, $uid])) {
2217                         return false;
2218                 }
2219
2220                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2221                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2222                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2223                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2224                                 if (!DBA::isResult($item)) {
2225                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'uri-id' => $uri_id]);
2226                                         return false;
2227                                 }
2228                         }
2229                 }
2230
2231                 // Retrieves the local post owner
2232                 $owner = User::getOwnerDataById($uid);
2233                 if (empty($owner)) {
2234                         Logger::info('Empty owner for user', ['uid' => $uid]);
2235                         return false;
2236                 }
2237
2238                 // Retrieve the current logged in user's public contact
2239                 $author_id = Contact::getIdForURL($owner['url']);
2240                 if (empty($author_id)) {
2241                         Logger::info('Empty public contact');
2242                         return false;
2243                 }
2244
2245                 $activity = null;
2246                 switch ($verb) {
2247                         case 'like':
2248                         case 'unlike':
2249                                 $activity = Activity::LIKE;
2250                                 break;
2251                         case 'dislike':
2252                         case 'undislike':
2253                                 $activity = Activity::DISLIKE;
2254                                 break;
2255                         case 'attendyes':
2256                         case 'unattendyes':
2257                                 $activity = Activity::ATTEND;
2258                                 break;
2259                         case 'attendno':
2260                         case 'unattendno':
2261                                 $activity = Activity::ATTENDNO;
2262                                 break;
2263                         case 'attendmaybe':
2264                         case 'unattendmaybe':
2265                                 $activity = Activity::ATTENDMAYBE;
2266                                 break;
2267                         case 'follow':
2268                         case 'unfollow':
2269                                 $activity = Activity::FOLLOW;
2270                                 break;
2271                         case 'announce':
2272                         case 'unannounce':
2273                                 $activity = Activity::ANNOUNCE;
2274                                 break;
2275                         default:
2276                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2277                                 return false;
2278                 }
2279
2280                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2281
2282                 // Enable activity toggling instead of on/off
2283                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2284
2285                 // Look for an existing verb row
2286                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2287                 if ($event_verb_flag) {
2288                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2289
2290                         // Translate to the index based activity index
2291                         $vids = [];
2292                         foreach ($verbs as $verb) {
2293                                 $vids[] = Verb::getID($verb);
2294                         }
2295                 } else {
2296                         $vids = Verb::getID($activity);
2297                 }
2298
2299                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2300                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent-id' => $uri_id];
2301                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2302
2303                 if (DBA::isResult($like_item)) {
2304                         /**
2305                          * Truth table for existing activities
2306                          *
2307                          * |          Inputs            ||      Outputs      |
2308                          * |----------------------------||-------------------|
2309                          * |  Mode  | Event | Same verb || Delete? | Return? |
2310                          * |--------|-------|-----------||---------|---------|
2311                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2312                          * | create |  Yes  |    No     ||   Yes   |   No    |
2313                          * | create |  No   |    Yes    ||   No    |   Yes   |
2314                          * | create |  No   |    No     ||        N/A†       |
2315                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2316                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2317                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2318                          * | delete |  No   |    No     ||        N/A†       |
2319                          * |--------|-------|-----------||---------|---------|
2320                          * |   A    |   B   |     C     || A xor C | !B or C |
2321                          *
2322                          * † Can't happen: It's impossible to find an existing non-event activity without
2323                          *                 the same verb because we are only looking for this single verb.
2324                          *
2325                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2326                          */
2327                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2328                                 self::markForDeletionById($like_item['id']);
2329                         }
2330
2331                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2332                                 return true;
2333                         }
2334                 }
2335
2336                 // No need to go further if we aren't creating anything
2337                 if ($mode == 'delete') {
2338                         return true;
2339                 }
2340
2341                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2342
2343                 $new_item = [
2344                         'guid'          => System::createUUID(),
2345                         'uri'           => self::newURI($item['uid']),
2346                         'uid'           => $item['uid'],
2347                         'contact-id'    => $owner['id'],
2348                         'wall'          => $item['wall'],
2349                         'origin'        => 1,
2350                         'network'       => Protocol::DFRN,
2351                         'protocol'      => Conversation::PARCEL_DIRECT,
2352                         'direction'     => Conversation::PUSH,
2353                         'gravity'       => GRAVITY_ACTIVITY,
2354                         'parent'        => $item['id'],
2355                         'thr-parent'    => $item['uri'],
2356                         'owner-id'      => $author_id,
2357                         'author-id'     => $author_id,
2358                         'body'          => $activity,
2359                         'verb'          => $activity,
2360                         'object-type'   => $objtype,
2361                         'allow_cid'     => $item['allow_cid'],
2362                         'allow_gid'     => $item['allow_gid'],
2363                         'deny_cid'      => $item['deny_cid'],
2364                         'deny_gid'      => $item['deny_gid'],
2365                         'visible'       => 1,
2366                         'unseen'        => 1,
2367                 ];
2368
2369                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2370                 if (!empty($signed)) {
2371                         $new_item['diaspora_signed_text'] = json_encode($signed);
2372                 }
2373
2374                 $new_item_id = self::insert($new_item);
2375
2376                 // If the parent item isn't visible then set it to visible
2377                 if (!$item['visible']) {
2378                         self::update(['visible' => true], ['id' => $item['id']]);
2379                 }
2380
2381                 $new_item['id'] = $new_item_id;
2382
2383                 Hook::callAll('post_local_end', $new_item);
2384
2385                 return true;
2386         }
2387
2388         /**
2389          * Fetch the SQL condition for the given user id
2390          *
2391          * @param integer $owner_id User ID for which the permissions should be fetched
2392          * @return array condition
2393          */
2394         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2395         {
2396                 $local_user = local_user();
2397                 $remote_user = Session::getRemoteContactID($owner_id);
2398
2399                 // default permissions - anonymous user
2400                 $condition = ["`private` != ?", self::PRIVATE];
2401
2402                 if ($local_user && ($local_user == $owner_id)) {
2403                         // Profile owner - everything is visible
2404                         $condition = [];
2405                 } elseif ($remote_user) {
2406                          // Authenticated visitor - fetch the matching permissionsets
2407                         $set = PermissionSet::get($owner_id, $remote_user);
2408                         if (!empty($set)) {
2409                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2410                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2411                                         self::PRIVATE, self::PRIVATE];
2412                                 $condition = array_merge($condition, $set);
2413                         }
2414                 }
2415
2416                 return $condition;
2417         }
2418
2419         /**
2420          * Get a permission SQL string for the given user
2421          *
2422          * @param int $owner_id
2423          * @param string $table
2424          * @return string
2425          */
2426         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2427         {
2428                 $local_user = local_user();
2429                 $remote_user = Session::getRemoteContactID($owner_id);
2430
2431                 if (!empty($table)) {
2432                         $table = DBA::quoteIdentifier($table) . '.';
2433                 }
2434
2435                 /*
2436                  * Construct permissions
2437                  *
2438                  * default permissions - anonymous user
2439                  */
2440                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2441
2442                 // Profile owner - everything is visible
2443                 if ($local_user && ($local_user == $owner_id)) {
2444                         $sql = '';
2445                 } elseif ($remote_user) {
2446                         /*
2447                          * Authenticated visitor. Unless pre-verified,
2448                          * check that the contact belongs to this $owner_id
2449                          * and load the groups the visitor belongs to.
2450                          * If pre-verified, the caller is expected to have already
2451                          * done this and passed the groups into this function.
2452                          */
2453                         $set = PermissionSet::get($owner_id, $remote_user);
2454
2455                         if (!empty($set)) {
2456                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2457                         } else {
2458                                 $sql_set = '';
2459                         }
2460
2461                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2462                 }
2463
2464                 return $sql;
2465         }
2466
2467         /**
2468          * get translated item type
2469          *
2470          * @param $item
2471          * @return string
2472          */
2473         public static function postType($item)
2474         {
2475                 if (!empty($item['event-id'])) {
2476                         return DI::l10n()->t('event');
2477                 } elseif (!empty($item['resource-id'])) {
2478                         return DI::l10n()->t('photo');
2479                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2480                         return DI::l10n()->t('activity');
2481                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2482                         return DI::l10n()->t('comment');
2483                 }
2484
2485                 return DI::l10n()->t('post');
2486         }
2487
2488         /**
2489          * Sets the "rendered-html" field of the provided item
2490          *
2491          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2492          *
2493          * @param array $item
2494          *
2495          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2496          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2497          */
2498         public static function putInCache(&$item)
2499         {
2500                 // Save original body to prevent addons to modify it
2501                 $body = $item['body'];
2502
2503                 $rendered_hash = $item['rendered-hash'] ?? '';
2504                 $rendered_html = $item['rendered-html'] ?? '';
2505
2506                 if ($rendered_hash == ''
2507                         || $rendered_html == ''
2508                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2509                         || DI::config()->get('system', 'ignore_cache')
2510                 ) {
2511                         self::addRedirToImageTags($item);
2512
2513                         $item['rendered-html'] = BBCode::convert($item['body']);
2514                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2515
2516                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2517                         Hook::callAll('put_item_in_cache', $hook_data);
2518                         $item['rendered-html'] = $hook_data['rendered-html'];
2519                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2520                         unset($hook_data);
2521
2522                         // Update if the generated values differ from the existing ones
2523                         if ((($rendered_hash != $item['rendered-hash']) || ($rendered_html != $item['rendered-html'])) && !empty($item['id'])) {
2524                                 self::update(
2525                                         [
2526                                                 'rendered-html' => $item['rendered-html'],
2527                                                 'rendered-hash' => $item['rendered-hash']
2528                                         ],
2529                                         ['id' => $item['id']]
2530                                 );
2531                         }
2532                 }
2533
2534                 $item['body'] = $body;
2535         }
2536
2537         /**
2538          * Find any non-embedded images in private items and add redir links to them
2539          *
2540          * @param array &$item The field array of an item row
2541          */
2542         private static function addRedirToImageTags(array &$item)
2543         {
2544                 $app = DI::app();
2545
2546                 $matches = [];
2547                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2548                 if ($cnt) {
2549                         foreach ($matches as $mtch) {
2550                                 if (strpos($mtch[1], '/redir') !== false) {
2551                                         continue;
2552                                 }
2553
2554                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2555                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2556                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2557                                 }
2558                         }
2559                 }
2560         }
2561
2562         /**
2563          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2564          * If attach is true, also add icons for item attachments.
2565          *
2566          * @param array   $item
2567          * @param boolean $attach
2568          * @param boolean $is_preview
2569          * @return string item body html
2570          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2571          * @throws \ImagickException
2572          * @hook  prepare_body_init item array before any work
2573          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2574          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2575          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2576          */
2577         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2578         {
2579                 $a = DI::app();
2580                 Hook::callAll('prepare_body_init', $item);
2581
2582                 // In order to provide theme developers more possibilities, event items
2583                 // are treated differently.
2584                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2585                         $ev = Event::getItemHTML($item);
2586                         return $ev;
2587                 }
2588
2589                 $tags = Tag::populateFromItem($item);
2590
2591                 $item['tags'] = $tags['tags'];
2592                 $item['hashtags'] = $tags['hashtags'];
2593                 $item['mentions'] = $tags['mentions'];
2594
2595                 // Compile eventual content filter reasons
2596                 $filter_reasons = [];
2597                 if (!$is_preview && public_contact() != $item['author-id']) {
2598                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2599                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2600                         }
2601
2602                         $hook_data = [
2603                                 'item' => $item,
2604                                 'filter_reasons' => $filter_reasons
2605                         ];
2606                         Hook::callAll('prepare_body_content_filter', $hook_data);
2607                         $filter_reasons = $hook_data['filter_reasons'];
2608                         unset($hook_data);
2609                 }
2610
2611                 self::putInCache($item);
2612                 $s = $item["rendered-html"];
2613
2614                 $hook_data = [
2615                         'item' => $item,
2616                         'html' => $s,
2617                         'preview' => $is_preview,
2618                         'filter_reasons' => $filter_reasons
2619                 ];
2620                 Hook::callAll('prepare_body', $hook_data);
2621                 $s = $hook_data['html'];
2622                 unset($hook_data);
2623
2624                 if (!$attach) {
2625                         // Replace the blockquotes with quotes that are used in mails.
2626                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2627                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2628                         return $s;
2629                 }
2630
2631                 $as = '';
2632                 $vhead = false;
2633                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2634                         $mime = $attachment['mimetype'];
2635
2636                         $author = ['uid' => 0, 'id' => $item['author-id'],
2637                                 'network' => $item['author-network'], 'url' => $item['author-link']];
2638                         $the_url = Contact::magicLinkByContact($author, $attachment['url']);
2639
2640                         if (strpos($mime, 'video') !== false) {
2641                                 if (!$vhead) {
2642                                         $vhead = true;
2643                                         DI::page()['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
2644                                 }
2645
2646                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2647                                         '$video' => [
2648                                                 'id'     => $item['author-id'],
2649                                                 'title'  => DI::l10n()->t('View Video'),
2650                                                 'src'    => $the_url,
2651                                                 'mime'   => $mime,
2652                                         ],
2653                                 ]);
2654                         }
2655
2656                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2657                         if ($filetype) {
2658                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
2659                                 $filesubtype = str_replace('.', '-', $filesubtype);
2660                         } else {
2661                                 $filetype = 'unkn';
2662                                 $filesubtype = 'unkn';
2663                         }
2664
2665                         $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
2666                         $title .= ' ' . ($attachment['size'] ?? 0) . ' ' . DI::l10n()->t('bytes');
2667
2668                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
2669                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
2670                 }
2671
2672                 if ($as != '') {
2673                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
2674                 }
2675
2676                 // Map.
2677                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2678                         $x = Map::byCoordinates(trim($item['coord']));
2679                         if ($x) {
2680                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2681                         }
2682                 }
2683
2684                 // Replace friendica image url size with theme preference.
2685                 if (!empty($a->theme_info['item_image_size'])) {
2686                         $ps = $a->theme_info['item_image_size'];
2687                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2688                 }
2689
2690                 $s = HTML::applyContentFilter($s, $filter_reasons);
2691
2692                 $hook_data = ['item' => $item, 'html' => $s];
2693                 Hook::callAll('prepare_body_final', $hook_data);
2694
2695                 return $hook_data['html'];
2696         }
2697
2698         /**
2699          * get private link for item
2700          *
2701          * @param array $item
2702          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
2703          * @throws \Exception
2704          */
2705         public static function getPlink($item)
2706         {
2707                 if (local_user()) {
2708                         $ret = [
2709                                 'href' => "display/" . $item['guid'],
2710                                 'orig' => "display/" . $item['guid'],
2711                                 'title' => DI::l10n()->t('View on separate page'),
2712                                 'orig_title' => DI::l10n()->t('view on separate page'),
2713                         ];
2714
2715                         if (!empty($item['plink'])) {
2716                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
2717                                 $ret["title"] = DI::l10n()->t('link to source');
2718                         }
2719                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
2720                         $ret = [
2721                                 'href' => $item['plink'],
2722                                 'orig' => $item['plink'],
2723                                 'title' => DI::l10n()->t('link to source'),
2724                         ];
2725                 } else {
2726                         $ret = [];
2727                 }
2728
2729                 return $ret;
2730         }
2731
2732         /**
2733          * Is the given item array a post that is sent as starting post to a forum?
2734          *
2735          * @param array $item
2736          * @param array $owner
2737          *
2738          * @return boolean "true" when it is a forum post
2739          */
2740         public static function isForumPost(array $item, array $owner = [])
2741         {
2742                 if (empty($owner)) {
2743                         $owner = User::getOwnerDataById($item['uid']);
2744                         if (empty($owner)) {
2745                                 return false;
2746                         }
2747                 }
2748
2749                 if (($item['author-id'] == $item['owner-id']) ||
2750                         ($owner['id'] == $item['contact-id']) ||
2751                         ($item['uri-id'] != $item['parent-uri-id']) ||
2752                         $item['origin']) {
2753                         return false;
2754                 }
2755
2756                 return Contact::isForum($item['contact-id']);
2757         }
2758
2759         /**
2760          * Search item id for given URI or plink
2761          *
2762          * @param string $uri
2763          * @param integer $uid
2764          *
2765          * @return integer item id
2766          */
2767         public static function searchByLink($uri, $uid = 0)
2768         {
2769                 $ssl_uri = str_replace('http://', 'https://', $uri);
2770                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2771
2772                 $item = Post::selectFirst(['id'], ['uri' => $uris, 'uid' => $uid]);
2773                 if (DBA::isResult($item)) {
2774                         return $item['id'];
2775                 }
2776
2777                 $item = Post::selectFirst(['id'], ['plink' => $uris, 'uid' => $uid]);
2778                 if (DBA::isResult($item)) {
2779                         return $item['id'];
2780                 }
2781
2782                 return 0;
2783         }
2784
2785         /**
2786          * Return the URI for a link to the post
2787          *
2788          * @param string $uri URI or link to post
2789          *
2790          * @return string URI
2791          */
2792         public static function getURIByLink(string $uri)
2793         {
2794                 $ssl_uri = str_replace('http://', 'https://', $uri);
2795                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2796
2797                 $item = Post::selectFirst(['uri'], ['uri' => $uris]);
2798                 if (DBA::isResult($item)) {
2799                         return $item['uri'];
2800                 }
2801
2802                 $item = Post::selectFirst(['uri'], ['plink' => $uris]);
2803                 if (DBA::isResult($item)) {
2804                         return $item['uri'];
2805                 }
2806
2807                 return '';
2808         }
2809
2810         /**
2811          * Fetches item for given URI or plink
2812          *
2813          * @param string $uri
2814          * @param integer $uid
2815          *
2816          * @return integer item id
2817          */
2818         public static function fetchByLink(string $uri, int $uid = 0)
2819         {
2820                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
2821                 $item_id = self::searchByLink($uri, $uid);
2822                 if (!empty($item_id)) {
2823                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2824                         return $item_id;
2825                 }
2826
2827                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
2828                         $item_id = self::searchByLink($fetched_uri, $uid);
2829                 } else {
2830                         $item_id = Diaspora::fetchByURL($uri);
2831                 }
2832
2833                 if (!empty($item_id)) {
2834                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2835                         return $item_id;
2836                 }
2837
2838                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
2839                 return 0;
2840         }
2841
2842         /**
2843          * Return share data from an item array (if the item is shared item)
2844          * We are providing the complete Item array, because at some time in the future
2845          * we hopefully will define these values not in the body anymore but in some item fields.
2846          * This function is meant to replace all similar functions in the system.
2847          *
2848          * @param array $item
2849          *
2850          * @return array with share information
2851          */
2852         public static function getShareArray($item)
2853         {
2854                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
2855                         return [];
2856                 }
2857
2858                 $attribute_string = $matches[2];
2859                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
2860                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
2861                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
2862                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
2863                         }
2864                 }
2865                 return $attributes;
2866         }
2867
2868         /**
2869          * Fetch item information for shared items from the original items and adds it.
2870          *
2871          * @param array $item
2872          *
2873          * @return array item array with data from the original item
2874          */
2875         public static function addShareDataFromOriginal(array $item)
2876         {
2877                 $shared = self::getShareArray($item);
2878                 if (empty($shared)) {
2879                         return $item;
2880                 }
2881
2882                 // Real reshares always have got a GUID.
2883                 if (empty($shared['guid'])) {
2884                         return $item;
2885                 }
2886
2887                 $uid = $item['uid'] ?? 0;
2888
2889                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
2890                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
2891                 if (!DBA::isResult($shared_item)) {
2892                         if (empty($shared['link'])) {
2893                                 return $item;
2894                         }
2895
2896                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
2897                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
2898                         if (empty($id)) {
2899                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
2900                                 return $item;
2901                         }
2902
2903                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
2904                         if (!DBA::isResult($shared_item)) {
2905                                 return $item;
2906                         }
2907                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
2908                 } else {
2909                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
2910                 }
2911
2912                 if (!empty($shared_item['title'])) {
2913                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
2914                         unset($shared_item['title']);
2915                 } else {
2916                         $body = $shared_item['body'];
2917                 }
2918
2919                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
2920                 unset($shared_item['body']);
2921
2922                 return array_merge($item, $shared_item);
2923         }
2924
2925         /**
2926          * Check a prospective item array against user-level permissions
2927          *
2928          * @param array $item Expected keys: uri, gravity, and
2929          *                    author-link if is author-id is set,
2930          *                    owner-link if is owner-id is set,
2931          *                    causer-link if is causer-id is set.
2932          * @param int   $user_id Local user ID
2933          * @return bool
2934          * @throws \Exception
2935          */
2936         protected static function isAllowedByUser(array $item, int $user_id)
2937         {
2938                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
2939                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
2940                         return false;
2941                 }
2942
2943                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
2944                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
2945                         return false;
2946                 }
2947
2948                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
2949                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
2950                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
2951                         return false;
2952                 }
2953
2954                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
2955                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
2956                         return false;
2957                 }
2958
2959                 return true;
2960         }
2961 }