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\Database;
  35 use Friendica\Database\DBA;
  36 use Friendica\Database\DBStructure;
  37 use Friendica\DI;
  38 use Friendica\Model\Post;
  39 use Friendica\Protocol\Activity;
  40 use Friendica\Protocol\ActivityPub;
  41 use Friendica\Protocol\Diaspora;
  42 use Friendica\Util\DateTimeFormat;
  43 use Friendica\Util\Map;
  44 use Friendica\Util\Network;
  45 use Friendica\Util\Strings;
  46 use Friendica\Worker\Delivery;
  47 use LanguageDetection\Language;
  48
  49 class Item
  50 {
  51         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  52         const PT_ARTICLE = 0;
  53         const PT_NOTE = 1;
  54         const PT_PAGE = 2;
  55         const PT_IMAGE = 16;
  56         const PT_AUDIO = 17;
  57         const PT_VIDEO = 18;
  58         const PT_DOCUMENT = 19;
  59         const PT_EVENT = 32;
  60         const PT_TAG = 64;
  61         const PT_TO = 65;
  62         const PT_CC = 66;
  63         const PT_BTO = 67;
  64         const PT_BCC = 68;
  65         const PT_FOLLOWER = 69;
  66         const PT_ANNOUNCEMENT = 70;
  67         const PT_COMMENT = 71;
  68         const PT_STORED = 72;
  69         const PT_GLOBAL = 73;
  70         const PT_RELAY = 74;
  71         const PT_FETCHED = 75;
  72         const PT_PERSONAL_NOTE = 128;
  73
  74         // Field list that is used to display the items
  75         const DISPLAY_FIELDLIST = [
  76                 'uid', 'id', 'parent', 'guid', 'network', 'gravity',
  77                 'uri-id', 'uri', 'thr-parent-id', 'thr-parent', 'parent-uri-id', 'parent-uri',
  78                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  79                 'wall', 'private', 'starred', 'origin', 'title', 'body', 'language',
  80                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  81                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  82                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  83                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
  84                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type',
  85                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  86                 'writable', 'self', 'cid', 'alias',
  87                 'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  88                 'event-summary', 'event-desc', 'event-location', 'event-type',
  89                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  90                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  91         ];
  92
  93         // Field list that is used to deliver items via the protocols
  94         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  95                         'parent-guid', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  96                         'private', 'title', 'body', 'location', 'coord', 'app',
  97                         'deleted', 'extid', 'post-type', 'gravity',
  98                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  99                         'author-id', 'author-link', 'owner-link', 'contact-uid',
 100                         'signed_text', 'network'];
 101
 102         // Field list for "item-content" table that is mixed with the item table
 103         const MIXED_CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
 104                         'coord', 'app', 'rendered-hash', 'rendered-html', 'verb',
 105                         'object-type', 'object', 'target-type', 'target', 'plink'];
 106
 107         // Field list for "item-content" table that is not present in the "item" table
 108         const CONTENT_FIELDLIST = ['language', 'raw-body'];
 109
 110         // All fields in the item table
 111         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 112                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 113                         'contact-id', 'type', 'wall', 'gravity', 'extid', 'psid',
 114                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 115                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 116                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
 117                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 118                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 119                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 120                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 121                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 122                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 123
 124         // List of all verbs that don't need additional content data.
 125         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 126         const ACTIVITIES = [
 127                 Activity::LIKE, Activity::DISLIKE,
 128                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 129                 Activity::FOLLOW,
 130                 Activity::ANNOUNCE];
 131
 132         const PUBLIC = 0;
 133         const PRIVATE = 1;
 134         const UNLISTED = 2;
 135
 136         const TABLES = ['item', 'user-item', 'item-content', 'post-delivery-data', 'diaspora-interaction'];
 137
 138         private static function getItemFields()
 139         {
 140                 $definition = DBStructure::definition('', false);
 141
 142                 $postfields = [];
 143                 foreach (self::TABLES as $table) {
 144                         $postfields[$table] = array_keys($definition[$table]['fields']);
 145                 }
 146
 147                 return $postfields;
 148         }
 149
 150         /**
 151          * Set the pinned state of an item
 152          *
 153          * @param integer $iid    Item ID
 154          * @param integer $uid    User ID
 155          * @param boolean $pinned Pinned state
 156          */
 157         public static function setPinned(int $iid, int $uid, bool $pinned)
 158         {
 159                 DBA::update('user-item', ['pinned' => $pinned], ['iid' => $iid, 'uid' => $uid], true);
 160         }
 161
 162         /**
 163          * Get the pinned state
 164          *
 165          * @param integer $iid Item ID
 166          * @param integer $uid User ID
 167          *
 168          * @return boolean pinned state
 169          */
 170         public static function getPinned(int $iid, int $uid)
 171         {
 172                 $useritem = DBA::selectFirst('user-item', ['pinned'], ['iid' => $iid, 'uid' => $uid]);
 173                 if (!DBA::isResult($useritem)) {
 174                         return false;
 175                 }
 176                 return (bool)$useritem['pinned'];
 177         }
 178
 179         /**
 180          * Update existing item entries
 181          *
 182          * @param array $fields    The fields that are to be changed
 183          * @param array $condition The condition for finding the item entries
 184          *
 185          * In the future we may have to change permissions as well.
 186          * Then we had to add the user id as third parameter.
 187          *
 188          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 189          *
 190          * @return integer|boolean number of affected rows - or "false" if there was an error
 191          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 192          */
 193         public static function update(array $fields, array $condition)
 194         {
 195                 if (empty($condition) || empty($fields)) {
 196                         return false;
 197                 }
 198
 199                 if (!empty($fields['verb'])) {
 200                         $fields['vid'] = Verb::getID($fields['verb']);
 201                 }
 202
 203                 $rows = Post::update($fields, $condition);
 204                 if (is_bool($rows)) {
 205                         return $rows;
 206                 }
 207
 208                 // We only need to call the line by line update for specific fields
 209                 if (empty($fields['body']) && empty($fields['file']) &&
 210                         empty($fields['attach']) && empty($fields['edited'])) {
 211                         return $rows;
 212                 }
 213
 214                 Logger::info('Updating per single row method', ['fields' => $fields, 'condition' => $condition]);
 215
 216                 $items = Post::select(['id', 'origin', 'uri-id', 'uid'], $condition);
 217
 218                 $notify_items = [];
 219
 220                 while ($item = DBA::fetch($items)) {
 221                         if (!empty($fields['body'])) {
 222                                 $content_fields = ['raw-body' => trim($fields['raw-body'] ?? $fields['body'])];
 223
 224                                 // Remove all media attachments from the body and store them in the post-media table
 225                                 $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 226                                 $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 227                                 self::updateContent($content_fields, ['uri-id' => $item['uri-id']]);
 228                         }
 229
 230                         if (!empty($fields['file'])) {
 231                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $fields['file']);
 232                         }
 233
 234                         if (!empty($fields['attach'])) {
 235                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 236                         }
 237
 238                         // We only need to notfiy others when it is an original entry from us.
 239                         // Only call the notifier when the item has some content relevant change.
 240                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 241                                 $notify_items[] = $item['id'];
 242                         }
 243                 }
 244
 245                 DBA::close($items);
 246
 247                 foreach ($notify_items as $notify_item) {
 248                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $notify_item);
 249                 }
 250
 251                 return $rows;
 252         }
 253
 254         /**
 255          * Delete an item and notify others about it - if it was ours
 256          *
 257          * @param array   $condition The condition for finding the item entries
 258          * @param integer $priority  Priority for the notification
 259          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 260          */
 261         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 262         {
 263                 $items = Post::select(['id'], $condition);
 264                 while ($item = Post::fetch($items)) {
 265                         self::markForDeletionById($item['id'], $priority);
 266                 }
 267                 DBA::close($items);
 268         }
 269
 270         /**
 271          * Delete an item for an user and notify others about it - if it was ours
 272          *
 273          * @param array   $condition The condition for finding the item entries
 274          * @param integer $uid       User who wants to delete this item
 275          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 276          */
 277         public static function deleteForUser($condition, $uid)
 278         {
 279                 if ($uid == 0) {
 280                         return;
 281                 }
 282
 283                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 284                 while ($item = Post::fetch($items)) {
 285                         if (in_array($item['uid'], [$uid, 0])) {
 286                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 287                         }
 288
 289                         // "Deleting" global items just means hiding them
 290                         if ($item['uid'] == 0) {
 291                                 DBA::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
 292                         } elseif ($item['uid'] == $uid) {
 293                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 294                         } else {
 295                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
 296                         }
 297                 }
 298                 DBA::close($items);
 299         }
 300
 301         /**
 302          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 303          *
 304          * @param integer $item_id
 305          * @param integer $priority Priority for the notification
 306          *
 307          * @return boolean success
 308          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 309          */
 310         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 311         {
 312                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 313                 // locate item to be deleted
 314                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri-id', 'origin',
 315                         'deleted', 'resource-id', 'event-id',
 316                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 317                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 318                 if (!DBA::isResult($item)) {
 319                         Logger::info('Item not found.', ['id' => $item_id]);
 320                         return false;
 321                 }
 322
 323                 if ($item['deleted']) {
 324                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 325                         return false;
 326                 }
 327
 328                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 329                 if (!DBA::isResult($parent)) {
 330                         $parent = ['origin' => false];
 331                 }
 332
 333                 // clean up categories and tags so they don't end up as orphans
 334                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 335
 336                 /*
 337                  * If item is a link to a photo resource, nuke all the associated photos
 338                  * (visitors will not have photo resources)
 339                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 340                  * generate a resource-id and therefore aren't intimately linked to the item.
 341                  */
 342                 /// @TODO: this should first check if photo is used elsewhere
 343                 if (strlen($item['resource-id'])) {
 344                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 345                 }
 346
 347                 // If item is a link to an event, delete the event.
 348                 if (intval($item['event-id'])) {
 349                         Event::delete($item['event-id']);
 350                 }
 351
 352                 // If item has attachments, drop them
 353                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 354                 foreach($attachments as $attachment) {
 355                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 356                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 357                         }
 358                 }
 359
 360                 // Set the item to "deleted"
 361                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 362                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 363
 364                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 365                 self::deleteThread($item['id'], $item['parent-uri-id']);
 366
 367                 if (!Post::exists(["`uri-id` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri-id']])) {
 368                         self::markForDeletion(['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false], $priority);
 369                 }
 370
 371                 Post\DeliveryData::delete($item['uri-id']);
 372
 373                 // When the permission set will be used in photo and events as well,
 374                 // this query here needs to be extended.
 375                 // @todo Currently deactivated. We need the permission set in the deletion process.
 376                 // This is a reminder to add the removal somewhere else.
 377                 //if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
 378                 //      DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
 379                 //}
 380
 381                 // If it's the parent of a comment thread, kill all the kids
 382                 if ($item['gravity'] == GRAVITY_PARENT) {
 383                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 384                 }
 385
 386                 // Is it our comment and/or our thread?
 387                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 388                         // When we delete the original post we will delete all existing copies on the server as well
 389                         self::markForDeletion(['uri-id' => $item['uri-id'], 'deleted' => false], $priority);
 390
 391                         // send the notification upstream/downstream
 392                         if ($priority) {
 393                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, intval($item['id']));
 394                         }
 395                 } elseif ($item['uid'] != 0) {
 396                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 397
 398                         // When we delete just our local user copy of an item, we have to set a marker to hide it
 399                         $global_item = Post::selectFirst(['id'], ['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false]);
 400                         if (DBA::isResult($global_item)) {
 401                                 DBA::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
 402                         }
 403                 }
 404
 405                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 406
 407                 return true;
 408         }
 409
 410         private static function guid($item, $notify)
 411         {
 412                 if (!empty($item['guid'])) {
 413                         return Strings::escapeTags(trim($item['guid']));
 414                 }
 415
 416                 if ($notify) {
 417                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 418                         // We add the hash of our own host because our host is the original creator of the post.
 419                         $prefix_host = DI::baseUrl()->getHostname();
 420                 } else {
 421                         $prefix_host = '';
 422
 423                         // We are only storing the post so we create a GUID from the original hostname.
 424                         if (!empty($item['author-link'])) {
 425                                 $parsed = parse_url($item['author-link']);
 426                                 if (!empty($parsed['host'])) {
 427                                         $prefix_host = $parsed['host'];
 428                                 }
 429                         }
 430
 431                         if (empty($prefix_host) && !empty($item['plink'])) {
 432                                 $parsed = parse_url($item['plink']);
 433                                 if (!empty($parsed['host'])) {
 434                                         $prefix_host = $parsed['host'];
 435                                 }
 436                         }
 437
 438                         if (empty($prefix_host) && !empty($item['uri'])) {
 439                                 $parsed = parse_url($item['uri']);
 440                                 if (!empty($parsed['host'])) {
 441                                         $prefix_host = $parsed['host'];
 442                                 }
 443                         }
 444
 445                         // Is it in the format data@host.tld? - Used for mail contacts
 446                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 447                                 $mailparts = explode('@', $item['author-link']);
 448                                 $prefix_host = array_pop($mailparts);
 449                         }
 450                 }
 451
 452                 if (!empty($item['plink'])) {
 453                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 454                 } elseif (!empty($item['uri'])) {
 455                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 456                 } else {
 457                         $guid = System::createUUID(hash('crc32', $prefix_host));
 458                 }
 459
 460                 return $guid;
 461         }
 462
 463         private static function contactId($item)
 464         {
 465                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 466                         return $item['contact-id'];
 467                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 468                         return $item['contact-id'];
 469                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 470                         return $item['author-id'];
 471                 } elseif (!empty($item['contact-id'])) {
 472                         return $item['contact-id'];
 473                 } else {
 474                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 475                         if (!empty($contact_id)) {
 476                                 return $contact_id;
 477                         }
 478                 }
 479                 return $item['author-id'];
 480         }
 481
 482         /**
 483          * Write an item array into a spool file to be inserted later.
 484          * This command is called whenever there are issues storing an item.
 485          *
 486          * @param array $item The item fields that are to be inserted
 487          * @throws \Exception
 488          */
 489         private static function spool($orig_item)
 490         {
 491                 // Now we store the data in the spool directory
 492                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 493                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 494
 495                 $spoolpath = get_spoolpath();
 496                 if ($spoolpath != "") {
 497                         $spool = $spoolpath . '/' . $file;
 498
 499                         file_put_contents($spool, json_encode($orig_item));
 500                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 501                 }
 502         }
 503
 504         /**
 505          * Check if the item array is a duplicate
 506          *
 507          * @param array $item
 508          * @return boolean is it a duplicate?
 509          */
 510         private static function isDuplicate(array $item)
 511         {
 512                 // Checking if there is already an item with the same guid
 513                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 514                 if (Post::exists($condition)) {
 515                         Logger::notice('Found already existing item', [
 516                                 'guid' => $item['guid'],
 517                                 'uid' => $item['uid'],
 518                                 'network' => $item['network']
 519                         ]);
 520                         return true;
 521                 }
 522
 523                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'],
 524                         'network' => [$item['network'], Protocol::DFRN]];
 525                 if (Post::exists($condition)) {
 526                         Logger::notice('duplicated item with the same uri found.', $item);
 527                         return true;
 528                 }
 529
 530                 // On Friendica and Diaspora the GUID is unique
 531                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 532                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 533                         if (Post::exists($condition)) {
 534                                 Logger::notice('duplicated item with the same guid found.', $item);
 535                                 return true;
 536                         }
 537                 } elseif ($item['network'] == Protocol::OSTATUS) {
 538                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 539                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 540                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 541                         if (Post::exists($condition)) {
 542                                 Logger::notice('duplicated item with the same body found.', $item);
 543                                 return true;
 544                         }
 545                 }
 546
 547                 /*
 548                  * Check for already added items.
 549                  * There is a timing issue here that sometimes creates double postings.
 550                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 551                  */
 552                 if (($item['uid'] == 0) && Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
 553                         Logger::notice('Global item already stored.', ['uri-id' => $item['uri-id'], 'network' => $item['network']]);
 554                         return true;
 555                 }
 556
 557                 return false;
 558         }
 559
 560         /**
 561          * Check if the item array is valid
 562          *
 563          * @param array $item
 564          * @return boolean item is valid
 565          */
 566         public static function isValid(array $item)
 567         {
 568                 // When there is no content then we don't post it
 569                 if ($item['body'] . $item['title'] == '') {
 570                         Logger::notice('No body, no title.');
 571                         return false;
 572                 }
 573
 574                 if (!empty($item['uid'])) {
 575                         $owner = User::getOwnerDataById($item['uid'], false);
 576                         if (!$owner) {
 577                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 578                                 return false;
 579                         }
 580
 581                         if ($owner['account_expired'] || $owner['account_removed']) {
 582                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 583                                 return false;
 584                         }
 585                 }
 586
 587                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 588                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 589                         return false;
 590                 }
 591
 592                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 593                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 594                         return false;
 595                 }
 596
 597                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 598                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 599                         return false;
 600                 }
 601
 602                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 603                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 604                         return false;
 605                 }
 606
 607                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 608                         return false;
 609                 }
 610
 611                 if ($item['verb'] == Activity::FOLLOW) {
 612                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 613                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 614                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 615                                 return false;
 616                         }
 617
 618                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 619                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 620                         if (Post::exists($condition)) {
 621                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 622                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 623                                 return false;
 624                         }
 625                 }
 626
 627                 return true;
 628         }
 629
 630         /**
 631          * Check if the item array is too old
 632          *
 633          * @param array $item
 634          * @return boolean item is too old
 635          */
 636         public static function isTooOld(array $item)
 637         {
 638                 // check for create date and expire time
 639                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 640
 641                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 642                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 643                         $expire_interval = $user['expire'];
 644                 }
 645
 646                 if (($expire_interval > 0) && !empty($item['created'])) {
 647                         $expire_date = time() - ($expire_interval * 86400);
 648                         $created_date = strtotime($item['created']);
 649                         if ($created_date < $expire_date) {
 650                                 Logger::notice('Item created before expiration interval.', [
 651                                         'created' => date('c', $created_date),
 652                                         'expired' => date('c', $expire_date),
 653                                         '$item' => $item
 654                                 ]);
 655                                 return true;
 656                         }
 657                 }
 658
 659                 return false;
 660         }
 661
 662         /**
 663          * Return the id of the given item array if it has been stored before
 664          *
 665          * @param array $item
 666          * @return integer item id
 667          */
 668         private static function getDuplicateID(array $item)
 669         {
 670                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 671                         $condition = ["`uri-id` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 672                                 $item['uri-id'], $item['uid'],
 673                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 674                         $existing = Post::selectFirst(['id', 'network'], $condition);
 675                         if (DBA::isResult($existing)) {
 676                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 677                                 if ($item['uid'] != 0) {
 678                                         Logger::notice('Item already existed for user', [
 679                                                 'uri-id' => $item['uri-id'],
 680                                                 'uid' => $item['uid'],
 681                                                 'network' => $item['network'],
 682                                                 'existing_id' => $existing["id"],
 683                                                 'existing_network' => $existing["network"]
 684                                         ]);
 685                                 }
 686
 687                                 return $existing["id"];
 688                         }
 689                 }
 690                 return 0;
 691         }
 692
 693         /**
 694          * Fetch top-level parent data for the given item array
 695          *
 696          * @param array $item
 697          * @return array item array with parent data
 698          * @throws \Exception
 699          */
 700         private static function getTopLevelParent(array $item)
 701         {
 702                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 703                         'uri-id', 'parent-uri-id',
 704                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 705                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 706                 $condition = ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']];
 707                 $params = ['order' => ['id' => false]];
 708                 $parent = Post::selectFirst($fields, $condition, $params);
 709
 710                 if (!DBA::isResult($parent)) {
 711                         Logger::notice('item parent was not found - ignoring item', ['thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 712                         return [];
 713                 }
 714
 715                 if ($parent['uri-id'] == $parent['parent-uri-id']) {
 716                         return $parent;
 717                 }
 718
 719                 $condition = ['uri-id' => $parent['parent-uri-id'],
 720                         'parent-uri-id' => $parent['parent-uri-id'],
 721                         'uid' => $parent['uid']];
 722                 $params = ['order' => ['id' => false]];
 723                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 724                 if (!DBA::isResult($toplevel_parent)) {
 725                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri-id' => $parent['parent-uri-id'], 'uid' => $parent['uid']]);
 726                         return [];
 727                 }
 728
 729                 return $toplevel_parent;
 730         }
 731
 732         /**
 733          * Get the gravity for the given item array
 734          *
 735          * @param array $item
 736          * @return integer gravity
 737          */
 738         private static function getGravity(array $item)
 739         {
 740                 $activity = DI::activity();
 741
 742                 if (isset($item['gravity'])) {
 743                         return intval($item['gravity']);
 744                 } elseif ($item['parent-uri-id'] === $item['uri-id']) {
 745                         return GRAVITY_PARENT;
 746                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 747                         return GRAVITY_COMMENT;
 748                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 749                         return GRAVITY_ACTIVITY;
 750                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 751                         return GRAVITY_ACTIVITY;
 752                 }
 753                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 754                 return GRAVITY_UNKNOWN;   // Should not happen
 755         }
 756
 757         public static function insert($item, $notify = false, $dontcache = false)
 758         {
 759                 $structure = self::getItemFields();
 760
 761                 $orig_item = $item;
 762
 763                 $priority = PRIORITY_HIGH;
 764
 765                 // If it is a posting where users should get notifications, then define it as wall posting
 766                 if ($notify) {
 767                         $item['wall'] = 1;
 768                         $item['origin'] = 1;
 769                         $item['network'] = Protocol::DFRN;
 770                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 771                         $item['direction'] = Conversation::PUSH;
 772
 773                         if (in_array($notify, PRIORITIES)) {
 774                                 $priority = $notify;
 775                         }
 776                 } else {
 777                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 778                 }
 779
 780                 $uid = intval($item['uid']);
 781
 782                 $item['guid'] = self::guid($item, $notify);
 783                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 784
 785                 // Store URI data
 786                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 787
 788                 // Backward compatibility: parent-uri used to be the direct parent uri.
 789                 // If it is provided without a thr-parent, it probably is the old behavior.
 790                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 791                 $item['parent-uri'] = $item['thr-parent'];
 792
 793                 $item['thr-parent-id'] = $item['parent-uri-id'] = ItemURI::getIdByURI($item['thr-parent']);
 794
 795                 // Store conversation data
 796                 $item = Conversation::insert($item);
 797
 798                 /*
 799                  * Do we already have this item?
 800                  * We have to check several networks since Friendica posts could be repeated
 801                  * via OStatus (maybe Diasporsa as well)
 802                  */
 803                 $duplicate = self::getDuplicateID($item);
 804                 if ($duplicate) {
 805                         return $duplicate;
 806                 }
 807
 808                 // Additional duplicate checks
 809                 /// @todo Check why the first duplication check returns the item number and the second a 0
 810                 if (self::isDuplicate($item)) {
 811                         return 0;
 812                 }
 813
 814                 $item['wall']          = intval($item['wall'] ?? 0);
 815                 $item['extid']         = trim($item['extid'] ?? '');
 816                 $item['author-name']   = trim($item['author-name'] ?? '');
 817                 $item['author-link']   = trim($item['author-link'] ?? '');
 818                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 819                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 820                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 821                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 822                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 823                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 824                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 825                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 826                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 827                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 828                 $item['location']      = trim($item['location'] ?? '');
 829                 $item['coord']         = trim($item['coord'] ?? '');
 830                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 831                 $item['deleted']       = 0;
 832                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
 833                 $item['verb']          = trim($item['verb'] ?? '');
 834                 $item['object-type']   = trim($item['object-type'] ?? '');
 835                 $item['object']        = trim($item['object'] ?? '');
 836                 $item['target-type']   = trim($item['target-type'] ?? '');
 837                 $item['target']        = trim($item['target'] ?? '');
 838                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 839                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 840                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 841                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 842                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 843                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 844                 $item['body']          = trim($item['body'] ?? '');
 845                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 846                 $item['app']           = trim($item['app'] ?? '');
 847                 $item['origin']        = intval($item['origin'] ?? 0);
 848                 $item['postopts']      = trim($item['postopts'] ?? '');
 849                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 850                 $item['event-id']      = intval($item['event-id'] ?? 0);
 851                 $item['inform']        = trim($item['inform'] ?? '');
 852                 $item['file']          = trim($item['file'] ?? '');
 853
 854                 // Items cannot be stored before they happen ...
 855                 if ($item['created'] > DateTimeFormat::utcNow()) {
 856                         $item['created'] = DateTimeFormat::utcNow();
 857                 }
 858
 859                 // We haven't invented time travel by now.
 860                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 861                         $item['edited'] = DateTimeFormat::utcNow();
 862                 }
 863
 864                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 865
 866                 $item['gravity'] = self::getGravity($item);
 867
 868                 $item['language'] = self::getLanguage($item);
 869
 870                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 871                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 872                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 873
 874                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 875                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 876                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 877
 878                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 879                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 880                         $item['post-type'] = self::PT_FOLLOWER;
 881                 }
 882
 883                 // Ensure that there is an avatar cache
 884                 Contact::checkAvatarCache($item['author-id']);
 885                 Contact::checkAvatarCache($item['owner-id']);
 886
 887                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 888                 $item["contact-id"] = self::contactId($item);
 889
 890                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 891                         self::isTooOld($item)) {
 892                         Logger::info('Item is too old', ['item' => $item]);
 893                         return 0;
 894                 }
 895
 896                 if (!self::isValid($item)) {
 897                         return 0;
 898                 }
 899
 900                 if ($item['gravity'] !== GRAVITY_PARENT) {
 901                         $toplevel_parent = self::getTopLevelParent($item);
 902                         if (empty($toplevel_parent)) {
 903                                 return 0;
 904                         }
 905
 906                         // If the thread originated from this node, we check the permission against the thread starter
 907                         $condition = ['uri-id' => $toplevel_parent['uri-id'], 'wall' => true];
 908                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 909                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 910                                 return 0;
 911                         }
 912
 913                         $parent_id             = $toplevel_parent['id'];
 914                         $item['parent-uri']    = $toplevel_parent['uri'];
 915                         $item['parent-uri-id'] = $toplevel_parent['uri-id'];
 916                         $item['deleted']       = $toplevel_parent['deleted'];
 917                         $item['allow_cid']     = $toplevel_parent['allow_cid'];
 918                         $item['allow_gid']     = $toplevel_parent['allow_gid'];
 919                         $item['deny_cid']      = $toplevel_parent['deny_cid'];
 920                         $item['deny_gid']      = $toplevel_parent['deny_gid'];
 921                         $parent_origin         = $toplevel_parent['origin'];
 922
 923                         // Don't federate received participation messages
 924                         if ($item['verb'] != Activity::FOLLOW) {
 925                                 $item['wall'] = $toplevel_parent['wall'];
 926                         } else {
 927                                 $item['wall'] = false;
 928                         }
 929
 930                         /*
 931                          * If the parent is private, force privacy for the entire conversation
 932                          * This differs from the above settings as it subtly allows comments from
 933                          * email correspondents to be private even if the overall thread is not.
 934                          */
 935                         if ($toplevel_parent['private']) {
 936                                 $item['private'] = $toplevel_parent['private'];
 937                         }
 938
 939                         /*
 940                          * Edge case. We host a public forum that was originally posted to privately.
 941                          * The original author commented, but as this is a comment, the permissions
 942                          * weren't fixed up so it will still show the comment as private unless we fix it here.
 943                          */
 944                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
 945                                 $item['private'] = self::PUBLIC;
 946                         }
 947
 948                         // If its a post that originated here then tag the thread as "mention"
 949                         if ($item['origin'] && $item['uid']) {
 950                                 DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
 951                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'uid' => $item['uid']]);
 952                         }
 953
 954                         // Update the contact relations
 955                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 956
 957                         unset($item['parent_origin']);
 958                 } else {
 959                         $parent_id = 0;
 960                         $parent_origin = $item['origin'];
 961                 }
 962
 963                 // We don't store the causer link, only the id
 964                 unset($item['causer-link']);
 965
 966                 // We don't store these fields anymore in the item table
 967                 unset($item['author-link']);
 968                 unset($item['author-name']);
 969                 unset($item['author-avatar']);
 970                 unset($item['author-network']);
 971
 972                 unset($item['owner-link']);
 973                 unset($item['owner-name']);
 974                 unset($item['owner-avatar']);
 975
 976                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
 977                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
 978
 979                 // Is this item available in the global items (with uid=0)?
 980                 if ($item["uid"] == 0) {
 981                         $item["global"] = true;
 982
 983                         // Set the global flag on all items if this was a global item entry
 984                         DBA::update('item', ['global' => true], ['uri-id' => $item['uri-id']]);
 985                 } else {
 986                         $item['global'] = Post::exists(['uid' => 0, 'uri-id' => $item['uri-id']]);
 987                 }
 988
 989                 // ACL settings
 990                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
 991                         $item["private"] = self::PRIVATE;
 992                 }
 993
 994                 if ($notify) {
 995                         $item['edit'] = false;
 996                         $item['parent'] = $parent_id;
 997                         Hook::callAll('post_local', $item);
 998                         unset($item['edit']);
 999                 } else {
1000                         Hook::callAll('post_remote', $item);
1001                 }
1002
1003                 // Set after the insert because top-level posts are self-referencing
1004                 unset($item['parent']);
1005
1006                 if (!empty($item['cancel'])) {
1007                         Logger::log('post cancelled by addon.');
1008                         return 0;
1009                 }
1010
1011                 if (empty($item['vid']) && !empty($item['verb'])) {
1012                         $item['vid'] = Verb::getID($item['verb']);
1013                 }
1014
1015                 // Creates or assigns the permission set
1016                 $item['psid'] = PermissionSet::getIdFromACL(
1017                         $item['uid'],
1018                         $item['allow_cid'],
1019                         $item['allow_gid'],
1020                         $item['deny_cid'],
1021                         $item['deny_gid']
1022                 );
1023
1024                 unset($item['allow_cid']);
1025                 unset($item['allow_gid']);
1026                 unset($item['deny_cid']);
1027                 unset($item['deny_gid']);
1028
1029                 // This array field is used to trigger some automatic reactions
1030                 // It is mainly used in the "post_local" hook.
1031                 unset($item['api_source']);
1032
1033                 if ($item['verb'] == Activity::ANNOUNCE) {
1034                         self::setOwnerforResharedItem($item);
1035                 }
1036
1037                 // Remove all media attachments from the body and store them in the post-media table
1038                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
1039                 $item['raw-body'] = self::setHashtags($item['raw-body']);
1040
1041                 // Check for hashtags in the body and repair or add hashtag links
1042                 $item['body'] = self::setHashtags($item['body']);
1043
1044                 if (!empty($item['attach'])) {
1045                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
1046                 }
1047
1048                 // Fill the cache field
1049                 self::putInCache($item);
1050
1051                 if (stristr($item['verb'], Activity::POKE)) {
1052                         $notify_type = Delivery::POKE;
1053                 } else {
1054                         $notify_type = Delivery::POST;
1055                 }
1056
1057                 if (!in_array($item['verb'], self::ACTIVITIES) && !self::insertContent($item)) {
1058                         // This shouldn't happen
1059                         Logger::warning('No content stored, quitting', ['guid' => $item['guid'], 'uri-id' => $item['uri-id'], 'causer-id' => ($item['causer-id'] ?? 0), 'post-type' => $item['post-type'], 'network' => $item['network']]);
1060                         return 0;
1061                 }
1062
1063                 $body = $item['body'];
1064                 $verb = $item['verb'];
1065
1066                 // We just remove everything that is content
1067                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1068                         unset($item[$field]);
1069                 }
1070
1071                 unset($item['activity']);
1072
1073                 // Filling item related side tables
1074
1075                 // Diaspora signature
1076                 if (!empty($item['diaspora_signed_text'])) {
1077                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
1078                 }
1079
1080                 unset($item['diaspora_signed_text']);
1081
1082                 // Attached file links
1083                 if (!empty($item['file'])) {
1084                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1085                 }
1086
1087                 unset($item['file']);
1088
1089                 // Delivery relevant data
1090                 $delivery_data = Post\DeliveryData::extractFields($item);
1091                 unset($item['postopts']);
1092                 unset($item['inform']);
1093
1094                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1095                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1096                 }
1097
1098                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1099                 if (!Tag::existsForPost($item['uri-id'])) {
1100                         Tag::storeFromBody($item['uri-id'], $body);
1101                 }
1102
1103                 $id = Post\User::insert($item['uri-id'], $item['uid'], $item);
1104                 if ($id) {
1105                         // Remove all fields that aren't part of the item table
1106                         foreach ($item as $field => $value) {
1107                                 if (!in_array($field, $structure['item'])) {
1108                                         unset($item[$field]);
1109                                 }
1110                         }
1111
1112                         // We syncronize the id value of the of the post-user table with the item table
1113                         $item['id'] = $id;
1114
1115                         $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'network' => $item['network']];
1116                         if (Post::exists($condition)) {
1117                                 Logger::notice('Item is already inserted - aborting', $condition);
1118                                 return 0;
1119                         }
1120
1121                         $result = DBA::insert('item', $item);
1122
1123                         // When the item was successfully stored we fetch the ID of the item.
1124                         $current_post = DBA::lastInsertId();
1125                 } else {
1126                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1127                         return 0;
1128                 }
1129
1130                 if (empty($current_post) || !DBA::isResult($result)) {
1131                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1132                         Logger::warning('Could not store item. it will be spooled', ['result' => $result, 'id' => $current_post]);
1133                         self::spool($orig_item);
1134                         return 0;
1135                 }
1136
1137                 Logger::notice('created item', ['id' => $current_post, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1138
1139                 if (!$parent_id || ($item['gravity'] === GRAVITY_PARENT)) {
1140                         $parent_id = $current_post;
1141                 }
1142
1143                 // Set parent id
1144                 DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1145
1146                 $item['id'] = $current_post;
1147                 $item['parent'] = $parent_id;
1148
1149                 // update the commented timestamp on the parent
1150                 if (DI::config()->get('system', 'like_no_comment')) {
1151                         // Update when it is a comment
1152                         $update_commented = in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1153                 } else {
1154                         // Update when it isn't a follow or tag verb
1155                         $update_commented = !in_array($verb, [Activity::FOLLOW, Activity::TAG]);
1156                 }
1157
1158                 if ($update_commented) {
1159                         DBA::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1160                 } else {
1161                         DBA::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1162                 }
1163
1164                 if ($item['gravity'] === GRAVITY_PARENT) {
1165                         self::addThread($current_post);
1166                 } else {
1167                         self::updateThread($parent_id);
1168                 }
1169
1170                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1171                 if (self::tagDeliver($item['uid'], $current_post)) {
1172                         // Get the user information for the logging
1173                         $user = User::getById($uid);
1174
1175                         Logger::notice('Item had been deleted', ['id' => $current_post, 'user' => $uid, 'account-type' => $user['account-type']]);
1176                         return 0;
1177                 }
1178
1179                 if (!$dontcache) {
1180                         $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1181                         if (DBA::isResult($posted_item)) {
1182                                 if ($notify) {
1183                                         Hook::callAll('post_local_end', $posted_item);
1184                                 } else {
1185                                         Hook::callAll('post_remote_end', $posted_item);
1186                                 }
1187                         } else {
1188                                 Logger::log('new item not found in DB, id ' . $current_post);
1189                         }
1190                 }
1191
1192                 if ($item['gravity'] === GRAVITY_PARENT) {
1193                         self::addShadow($current_post);
1194                 } else {
1195                         self::addShadowPost($current_post);
1196                 }
1197
1198                 self::updateContact($item);
1199
1200                 UserItem::setNotification($current_post);
1201
1202                 check_user_notification($current_post);
1203
1204                 // Distribute items to users who subscribed to their tags
1205                 self::distributeByTags($item);
1206
1207                 // Automatically reshare the item if the "remote_self" option is selected
1208                 self::autoReshare($item);
1209
1210                 $transmit = $notify || ($item['visible'] && ($parent_origin || $item['origin']));
1211
1212                 if ($transmit) {
1213                         $transmit_item = Post::selectFirst(['verb', 'origin'], ['id' => $item['id']]);
1214                         // Don't relay participation messages
1215                         if (($transmit_item['verb'] == Activity::FOLLOW) &&
1216                                 (!$transmit_item['origin'] || ($item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1217                                 Logger::info('Participation messages will not be relayed', ['item' => $item['id'], 'uri' => $item['uri'], 'verb' => $transmit_item['verb']]);
1218                                 $transmit = false;
1219                         }
1220                 }
1221
1222                 if ($transmit) {
1223                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
1224                 }
1225
1226                 return $current_post;
1227         }
1228
1229         /**
1230          * Change the owner of a parent item if it had been shared by a forum
1231          *
1232          * (public) forum posts in the new format consist of the regular post by the author
1233          * followed by an announce message sent from the forum account.
1234          * Changing the owner helps in grouping forum posts.
1235          *
1236          * @param array $item
1237          * @return void
1238          */
1239         private static function setOwnerforResharedItem(array $item)
1240         {
1241                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-type'],
1242                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1243                 if (!DBA::isResult($parent)) {
1244                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1245                         return;
1246                 }
1247
1248                 $author = Contact::selectFirst(['url', 'contact-type'], ['id' => $item['author-id']]);
1249                 if (!DBA::isResult($author)) {
1250                         Logger::error('Author not found', ['id' => $item['author-id']]);
1251                         return;
1252                 }
1253
1254                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1255                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1256                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid']]);
1257                         return;
1258                 }
1259
1260                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1261                         if ($parent['post-type'] == self::PT_ANNOUNCEMENT) {
1262                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1263                                 return;
1264                         }
1265
1266                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1267                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1268                                 return;
1269                         }
1270                         self::update(['post-type' => self::PT_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1271                         Logger::info('Set announcement post-type', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1272                         return;
1273                 }
1274
1275                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1276                 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]);
1277         }
1278
1279         /**
1280          * Distribute the given item to users who subscribed to their tags
1281          *
1282          * @param array $item     Processed item
1283          */
1284         private static function distributeByTags(array $item)
1285         {
1286                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1287                         return;
1288                 }
1289
1290                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1291                 foreach ($uids as $uid) {
1292                         if (Contact::isSharing($item['author-id'], $uid)) {
1293                                 $fields = [];
1294                         } else {
1295                                 $fields = ['post-type' => self::PT_TAG];
1296                         }
1297
1298                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1299                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1300                 }
1301         }
1302
1303         /**
1304          * Insert a new item content entry
1305          *
1306          * @param array $item The item fields that are to be inserted
1307          * @return bool "true" if content was inserted or already existed
1308          * @throws \Exception
1309          */
1310         private static function insertContent(array $item)
1311         {
1312                 $fields = ['uri-plink-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
1313
1314                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1315                         if (isset($item[$field])) {
1316                                 $fields[$field] = $item[$field];
1317                         }
1318                 }
1319
1320                 $found = DBA::exists('item-content', ['uri-id' => $item['uri-id']]);
1321                 if ($found) {
1322                         Logger::info('Existing content found', ['uri-id' => $item['uri-id'], 'uri' => $item['uri']]);
1323                         return true;
1324                 }
1325
1326                 DBA::insert('item-content', $fields, Database::INSERT_IGNORE);
1327
1328                 $found = DBA::exists('item-content', ['uri-id' => $item['uri-id']]);
1329                 if ($found) {
1330                         Logger::notice('Content inserted', ['uri-id' => $item['uri-id'], 'uri' => $item['uri']]);
1331                         return true;
1332                 }
1333
1334                 // This shouldn't happen.
1335                 Logger::error("Content wasn't inserted", $item);
1336                 return false;
1337         }
1338
1339         /**
1340          * Update existing item content entries
1341          *
1342          * @param array $item      The item fields that are to be changed
1343          * @param array $condition The condition for finding the item content entries
1344          * @throws \Exception
1345          */
1346         private static function updateContent($item, $condition)
1347         {
1348                 // We have to select only the fields from the "item-content" table
1349                 $fields = [];
1350                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1351                         if (isset($item[$field])) {
1352                                 $fields[$field] = $item[$field];
1353                         }
1354                 }
1355
1356                 if (empty($fields)) {
1357                         return;
1358                 }
1359
1360                 DBA::update('item-content', $fields, $condition, true);
1361                 Logger::info('Updated content', ['condition' => $condition]);
1362         }
1363
1364         /**
1365          * Distributes public items to the receivers
1366          *
1367          * @param integer $itemid      Item ID that should be added
1368          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1369          * @throws \Exception
1370          */
1371         public static function distribute($itemid, $signed_text = '')
1372         {
1373                 $condition = ["`id` IN (SELECT `parent` FROM `post-view` WHERE `id` = ?)", $itemid];
1374                 $parent = Post::selectFirst(['owner-id'], $condition);
1375                 if (!DBA::isResult($parent)) {
1376                         return;
1377                 }
1378
1379                 // Only distribute public items from native networks
1380                 $condition = ['id' => $itemid, 'uid' => 0,
1381                         'network' => array_merge(Protocol::FEDERATED ,['']),
1382                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1383                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1384                 if (!DBA::isResult($item)) {
1385                         return;
1386                 }
1387
1388                 $origin = $item['origin'];
1389
1390                 $users = [];
1391
1392                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1393                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1394                 if (!DBA::isResult($owner)) {
1395                         return;
1396                 }
1397
1398                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1399                 $contacts = DBA::select('contact', ['uid'], $condition);
1400                 while ($contact = DBA::fetch($contacts)) {
1401                         if ($contact['uid'] == 0) {
1402                                 continue;
1403                         }
1404
1405                         $users[$contact['uid']] = $contact['uid'];
1406                 }
1407                 DBA::close($contacts);
1408
1409                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1410                 $contacts = DBA::select('contact', ['uid'], $condition);
1411                 while ($contact = DBA::fetch($contacts)) {
1412                         if ($contact['uid'] == 0) {
1413                                 continue;
1414                         }
1415
1416                         $users[$contact['uid']] = $contact['uid'];
1417                 }
1418                 DBA::close($contacts);
1419
1420                 if (!empty($owner['alias'])) {
1421                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1422                         $contacts = DBA::select('contact', ['uid'], $condition);
1423                         while ($contact = DBA::fetch($contacts)) {
1424                                 if ($contact['uid'] == 0) {
1425                                         continue;
1426                                 }
1427
1428                                 $users[$contact['uid']] = $contact['uid'];
1429                         }
1430                         DBA::close($contacts);
1431                 }
1432
1433                 $origin_uid = 0;
1434
1435                 if ($item['uri-id'] != $item['parent-uri-id']) {
1436                         $parents = Post::select(['uid', 'origin'], ["`uri-id` = ? AND `uid` != 0", $item['parent-uri-id']]);
1437                         while ($parent = Post::fetch($parents)) {
1438                                 $users[$parent['uid']] = $parent['uid'];
1439                                 if ($parent['origin'] && !$origin) {
1440                                         $origin_uid = $parent['uid'];
1441                                 }
1442                         }
1443                         DBA::close($parents);
1444                 }
1445
1446                 foreach ($users as $uid) {
1447                         if ($origin_uid == $uid) {
1448                                 $item['diaspora_signed_text'] = $signed_text;
1449                         }
1450                         self::storeForUser($item, $uid);
1451                 }
1452         }
1453
1454         /**
1455          * Store a public item defined by their URI-ID for the given users
1456          *
1457          * @param integer $uri_id URI-ID of the given item
1458          * @param integer $uid    The user that will receive the item entry
1459          * @param array   $fields Additional fields to be stored
1460          * @return integer stored item id
1461          */
1462         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1463         {
1464                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1465                 if (!DBA::isResult($item)) {
1466                         return 0;
1467                 }
1468
1469                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1470                         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']]);
1471                         return 0;
1472                 }
1473
1474                 $item['post-type'] = self::PT_STORED;
1475
1476                 $item = array_merge($item, $fields);
1477
1478                 $stored = self::storeForUser($item, $uid);
1479                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1480                 return $stored;
1481         }
1482
1483         /**
1484          * Store a public item array for the given users
1485          *
1486          * @param array   $item   The item entry that will be stored
1487          * @param integer $uid    The user that will receive the item entry
1488          * @return integer stored item id
1489          * @throws \Exception
1490          */
1491         private static function storeForUser(array $item, int $uid)
1492         {
1493                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1494                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1495                         return 0;
1496                 }
1497
1498                 unset($item['id']);
1499                 unset($item['parent']);
1500                 unset($item['mention']);
1501                 unset($item['starred']);
1502                 unset($item['unseen']);
1503                 unset($item['psid']);
1504
1505                 $item['uid'] = $uid;
1506                 $item['origin'] = 0;
1507                 $item['wall'] = 0;
1508
1509                 if ($item['gravity'] == GRAVITY_PARENT) {
1510                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1511                 } else {
1512                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1513                 }
1514
1515                 if (!empty($contact['id'])) {
1516                         $item['contact-id'] = $contact['id'];
1517                 } else {
1518                         // Shouldn't happen at all
1519                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1520                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1521                         if (!DBA::isResult($self)) {
1522                                 // Shouldn't happen even less
1523                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1524                                 return 0;
1525                         }
1526                         $item['contact-id'] = $self['id'];
1527                 }
1528
1529                 /// @todo Handling of "event-id"
1530
1531                 $notify = false;
1532                 if ($item['gravity'] == GRAVITY_PARENT) {
1533                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1534                         if (DBA::isResult($contact)) {
1535                                 $notify = self::isRemoteSelf($contact, $item);
1536                         }
1537                 }
1538
1539                 $distributed = self::insert($item, $notify, true);
1540
1541                 if (!$distributed) {
1542                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1543                 } else {
1544                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1545                 }
1546                 return $distributed;
1547         }
1548
1549         /**
1550          * Add a shadow entry for a given item id that is a thread starter
1551          *
1552          * We store every public item entry additionally with the user id "0".
1553          * This is used for the community page and for the search.
1554          * It is planned that in the future we will store public item entries only once.
1555          *
1556          * @param integer $itemid Item ID that should be added
1557          * @throws \Exception
1558          */
1559         private static function addShadow($itemid)
1560         {
1561                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri-id'];
1562                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1563                 $item = Post::selectFirst($fields, $condition);
1564
1565                 if (!DBA::isResult($item)) {
1566                         return;
1567                 }
1568
1569                 // is it already a copy?
1570                 if (($itemid == 0) || ($item['uid'] == 0)) {
1571                         return;
1572                 }
1573
1574                 // Is it a visible public post?
1575                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || ($item["private"] == self::PRIVATE)) {
1576                         return;
1577                 }
1578
1579                 // is it an entry from a connector? Only add an entry for natively connected networks
1580                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1581                         return;
1582                 }
1583
1584                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1585                         return;
1586                 }
1587
1588                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1589
1590                 if (DBA::isResult($item)) {
1591                         // Preparing public shadow (removing user specific data)
1592                         $item['uid'] = 0;
1593                         unset($item['id']);
1594                         unset($item['parent']);
1595                         unset($item['wall']);
1596                         unset($item['mention']);
1597                         unset($item['origin']);
1598                         unset($item['starred']);
1599                         unset($item['postopts']);
1600                         unset($item['inform']);
1601                         unset($item['post-type']);
1602                         if ($item['uri-id'] == $item['parent-uri-id']) {
1603                                 $item['contact-id'] = $item['owner-id'];
1604                         } else {
1605                                 $item['contact-id'] = $item['author-id'];
1606                         }
1607
1608                         $public_shadow = self::insert($item, false, true);
1609
1610                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1611                 }
1612         }
1613
1614         /**
1615          * Add a shadow entry for a given item id that is a comment
1616          *
1617          * This function does the same like the function above - but for comments
1618          *
1619          * @param integer $itemid Item ID that should be added
1620          * @throws \Exception
1621          */
1622         private static function addShadowPost($itemid)
1623         {
1624                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1625                 if (!DBA::isResult($item)) {
1626                         return;
1627                 }
1628
1629                 // Is it a toplevel post?
1630                 if ($item['gravity'] == GRAVITY_PARENT) {
1631                         self::addShadow($itemid);
1632                         return;
1633                 }
1634
1635                 // Is this a shadow entry?
1636                 if ($item['uid'] == 0) {
1637                         return;
1638                 }
1639
1640                 // Is there a shadow parent?
1641                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
1642                         return;
1643                 }
1644
1645                 // Is there already a shadow entry?
1646                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1647                         return;
1648                 }
1649
1650                 // Save "origin" and "parent" state
1651                 $origin = $item['origin'];
1652                 $parent = $item['parent'];
1653
1654                 // Preparing public shadow (removing user specific data)
1655                 $item['uid'] = 0;
1656                 unset($item['id']);
1657                 unset($item['parent']);
1658                 unset($item['wall']);
1659                 unset($item['mention']);
1660                 unset($item['origin']);
1661                 unset($item['starred']);
1662                 unset($item['postopts']);
1663                 unset($item['inform']);
1664                 unset($item['post-type']);
1665                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1666
1667                 $public_shadow = self::insert($item, false, true);
1668
1669                 Logger::info('Stored public shadow', ['uri-id' => $item['uri-id'], 'id' => $public_shadow]);
1670
1671                 // If this was a comment to a Diaspora post we don't get our comment back.
1672                 // This means that we have to distribute the comment by ourselves.
1673                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1674                         self::distribute($public_shadow);
1675                 }
1676         }
1677
1678         /**
1679          * Adds a language specification in a "language" element of given $arr.
1680          * Expects "body" element to exist in $arr.
1681          *
1682          * @param array $item
1683          * @return string detected language
1684          * @throws \Text_LanguageDetect_Exception
1685          */
1686         private static function getLanguage(array $item)
1687         {
1688                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1689                         return '';
1690                 }
1691
1692                 // Convert attachments to links
1693                 $naked_body = BBCode::removeAttachment($item['body']);
1694                 if (empty($naked_body)) {
1695                         return '';
1696                 }
1697
1698                 // Remove links and pictures
1699                 $naked_body = BBCode::removeLinks($naked_body);
1700
1701                 // Convert the title and the body to plain text
1702                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1703
1704                 // Remove possibly remaining links
1705                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1706
1707                 if (empty($naked_body)) {
1708                         return '';
1709                 }
1710
1711                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1712                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1713                 if (is_array($languages)) {
1714                         return json_encode($languages);
1715                 }
1716
1717                 return '';
1718         }
1719
1720         public static function getLanguageMessage(array $item)
1721         {
1722                 $iso639 = new \Matriphe\ISO639\ISO639;
1723
1724                 $used_languages = '';
1725                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1726                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1727                 }
1728                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1729                 return $used_languages;
1730         }
1731
1732         /**
1733          * Creates an unique guid out of a given uri
1734          *
1735          * @param string $uri uri of an item entry
1736          * @param string $host hostname for the GUID prefix
1737          * @return string unique guid
1738          */
1739         public static function guidFromUri($uri, $host)
1740         {
1741                 // Our regular guid routine is using this kind of prefix as well
1742                 // We have to avoid that different routines could accidentally create the same value
1743                 $parsed = parse_url($uri);
1744
1745                 // We use a hash of the hostname as prefix for the guid
1746                 $guid_prefix = hash("crc32", $host);
1747
1748                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1749                 unset($parsed["scheme"]);
1750
1751                 // Glue it together to be able to make a hash from it
1752                 $host_id = implode("/", $parsed);
1753
1754                 // We could use any hash algorithm since it isn't a security issue
1755                 $host_hash = hash("ripemd128", $host_id);
1756
1757                 return $guid_prefix.$host_hash;
1758         }
1759
1760         /**
1761          * generate an unique URI
1762          *
1763          * @param integer $uid  User id
1764          * @param string  $guid An existing GUID (Otherwise it will be generated)
1765          *
1766          * @return string
1767          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1768          */
1769         public static function newURI($uid, $guid = "")
1770         {
1771                 if ($guid == "") {
1772                         $guid = System::createUUID();
1773                 }
1774
1775                 return DI::baseUrl()->get() . '/objects/' . $guid;
1776         }
1777
1778         /**
1779          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1780          *
1781          * This can be used to filter for inactive contacts.
1782          * Only do this for public postings to avoid privacy problems, since poco data is public.
1783          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1784          *
1785          * @param array $arr Contains the just posted item record
1786          * @throws \Exception
1787          */
1788         private static function updateContact($arr)
1789         {
1790                 // Unarchive the author
1791                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1792                 if (DBA::isResult($contact)) {
1793                         Contact::unmarkForArchival($contact);
1794                 }
1795
1796                 // Unarchive the contact if it's not our own contact
1797                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1798                 if (DBA::isResult($contact)) {
1799                         Contact::unmarkForArchival($contact);
1800                 }
1801
1802                 /// @todo On private posts we could obfuscate the date
1803                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1804
1805                 // Is it a forum? Then we don't care about the rules from above
1806                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri-id"] === $arr["uri-id"])) {
1807                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1808                                 $update = true;
1809                         }
1810                 }
1811
1812                 if ($update) {
1813                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1814                         // So we have to ensure to only update the last item when it had been our own post,
1815                         // or it had been done by a "regular" contact.
1816                         if (!empty($arr['wall'])) {
1817                                 $condition = ['id' => $arr['contact-id']];
1818                         } else {
1819                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1820                         }
1821                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1822                 }
1823                 // Now do the same for the system wide contacts with uid=0
1824                 if ($arr['private'] != self::PRIVATE) {
1825                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1826                                 ['id' => $arr['owner-id']]);
1827
1828                         if ($arr['owner-id'] != $arr['author-id']) {
1829                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1830                                         ['id' => $arr['author-id']]);
1831                         }
1832                 }
1833         }
1834
1835         public static function setHashtags($body)
1836         {
1837                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1838                         $tags = BBCode::getTags($body);
1839
1840                         // No hashtags?
1841                         if (!count($tags)) {
1842                                 return $body;
1843                         }
1844
1845                         // This sorting is important when there are hashtags that are part of other hashtags
1846                         // Otherwise there could be problems with hashtags like #test and #test2
1847                         // Because of this we are sorting from the longest to the shortest tag.
1848                         usort($tags, function ($a, $b) {
1849                                 return strlen($b) <=> strlen($a);
1850                         });
1851
1852                         $URLSearchString = "^\[\]";
1853
1854                         // All hashtags should point to the home server if "local_tags" is activated
1855                         if (DI::config()->get('system', 'local_tags')) {
1856                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1857                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1858                         }
1859
1860                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1861                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1862                                 function ($match) {
1863                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1864                                 }, $body);
1865
1866                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1867                                 function ($match) {
1868                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1869                                 }, $body);
1870
1871                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1872                                 function ($match) {
1873                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1874                                 }, $body);
1875
1876                         // Repair recursive urls
1877                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1878                                 "&num;$2", $body);
1879
1880                         foreach ($tags as $tag) {
1881                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1882                                         continue;
1883                                 }
1884
1885                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1886                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1887
1888                                 $body = str_replace($tag, $newtag, $body);
1889                         }
1890
1891                         // Convert back the masked hashtags
1892                         $body = str_replace("&num;", "#", $body);
1893
1894                         return $body;
1895                 });
1896
1897                 return $body;
1898         }
1899
1900         /**
1901          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1902          *
1903          * @param int $uid
1904          * @param int $item_id
1905          * @return boolean true if item was deleted, else false
1906          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1907          * @throws \ImagickException
1908          */
1909         private static function tagDeliver($uid, $item_id)
1910         {
1911                 $mention = false;
1912
1913                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1914                 if (!DBA::isResult($user)) {
1915                         return false;
1916                 }
1917
1918                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1919                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1920
1921                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1922                 if (!DBA::isResult($item)) {
1923                         return false;
1924                 }
1925
1926                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1927
1928                 /*
1929                  * Diaspora uses their own hardwired link URL in @-tags
1930                  * instead of the one we supply with webfinger
1931                  */
1932                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
1933
1934                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1935                 if ($cnt) {
1936                         foreach ($matches as $mtch) {
1937                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
1938                                         $mention = true;
1939                                         Logger::log('mention found: ' . $mtch[2]);
1940                                 }
1941                         }
1942                 }
1943
1944                 if (!$mention) {
1945                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1946                         foreach ($tags as $tag) {
1947                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
1948                                         $mention = true;
1949                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
1950                                 }
1951                         }
1952                 }
1953
1954                 if (!$mention) {
1955                         if (($community_page || $prvgroup) &&
1956                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
1957                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item_id, 'guid'=> $item['guid']]);
1958                                 DBA::delete('item', ['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1959                                 Post\User::delete(['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1960                                 return true;
1961                         }
1962                         return false;
1963                 }
1964
1965                 $arr = ['item' => $item, 'user' => $user];
1966
1967                 Hook::callAll('tagged', $arr);
1968
1969                 if (!$community_page && !$prvgroup) {
1970                         return false;
1971                 }
1972
1973                 /*
1974                  * tgroup delivery - setup a second delivery chain
1975                  * prevent delivery looping - only proceed
1976                  * if the message originated elsewhere and is a top-level post
1977                  */
1978                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
1979                         return false;
1980                 }
1981
1982                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
1983                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
1984                 if (!DBA::isResult($self)) {
1985                         return false;
1986                 }
1987
1988                 $owner_id = Contact::getIdForURL($self['url']);
1989
1990                 // also reset all the privacy bits to the forum default permissions
1991
1992                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
1993
1994                 $psid = PermissionSet::getIdFromACL(
1995                         $user['uid'],
1996                         $user['allow_cid'],
1997                         $user['allow_gid'],
1998                         $user['deny_cid'],
1999                         $user['deny_gid']
2000                 );
2001
2002                 $forum_mode = ($prvgroup ? 2 : 1);
2003
2004                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2005                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2006                 self::update($fields, ['id' => $item_id]);
2007
2008                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, $item_id);
2009
2010                 self::performActivity($item_id, 'announce', $uid);
2011
2012                 return false;
2013         }
2014
2015         /**
2016          * Automatically reshare the item if the "remote_self" option is selected
2017          *
2018          * @param array $item
2019          * @return void
2020          */
2021         private static function autoReshare(array $item)
2022         {
2023                 if ($item['gravity'] != GRAVITY_PARENT) {
2024                         return;
2025                 }
2026
2027                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
2028                         return;
2029                 }
2030
2031                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
2032                         return;
2033                 }
2034
2035                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
2036
2037                 self::performActivity($item['id'], 'announce', $item['uid']);
2038         }
2039
2040         public static function isRemoteSelf($contact, &$datarray)
2041         {
2042                 if (!$contact['remote_self']) {
2043                         return false;
2044                 }
2045
2046                 // Prevent the forwarding of posts that are forwarded
2047                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2048                         Logger::info('Already forwarded');
2049                         return false;
2050                 }
2051
2052                 // Prevent to forward already forwarded posts
2053                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
2054                         Logger::info('Already forwarded (second test)');
2055                         return false;
2056                 }
2057
2058                 // Only forward posts
2059                 if ($datarray["verb"] != Activity::POST) {
2060                         Logger::info('No post');
2061                         return false;
2062                 }
2063
2064                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
2065                         Logger::info('Not public');
2066                         return false;
2067                 }
2068
2069                 $datarray2 = $datarray;
2070                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
2071                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
2072                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2073                                         ['uid' => $contact['uid'], 'self' => true]);
2074                         if (DBA::isResult($self)) {
2075                                 $datarray['contact-id'] = $self["id"];
2076
2077                                 $datarray['owner-name'] = $self["name"];
2078                                 $datarray['owner-link'] = $self["url"];
2079                                 $datarray['owner-avatar'] = $self["thumb"];
2080
2081                                 $datarray['author-name']   = $datarray['owner-name'];
2082                                 $datarray['author-link']   = $datarray['owner-link'];
2083                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2084
2085                                 unset($datarray['edited']);
2086
2087                                 unset($datarray['network']);
2088                                 unset($datarray['owner-id']);
2089                                 unset($datarray['author-id']);
2090                         }
2091
2092                         if ($contact['network'] != Protocol::FEED) {
2093                                 $old_uri_id = $datarray["uri-id"] ?? 0;
2094                                 $datarray["guid"] = System::createUUID();
2095                                 unset($datarray["plink"]);
2096                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2097                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
2098                                 $datarray["extid"] = Protocol::DFRN;
2099                                 $urlpart = parse_url($datarray2['author-link']);
2100                                 $datarray["app"] = $urlpart["host"];
2101                                 if (!empty($old_uri_id)) {
2102                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
2103                                 }
2104
2105                                 unset($datarray["parent-uri"]);
2106                                 unset($datarray["thr-parent"]);
2107                         } else {
2108                                 $datarray['private'] = self::PUBLIC;
2109                         }
2110                 }
2111
2112                 if ($contact['network'] != Protocol::FEED) {
2113                         // Store the original post
2114                         $result = self::insert($datarray2);
2115                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
2116                 } else {
2117                         $datarray["app"] = "Feed";
2118                         $result = true;
2119                 }
2120
2121                 // Trigger automatic reactions for addons
2122                 $datarray['api_source'] = true;
2123
2124                 // We have to tell the hooks who we are - this really should be improved
2125                 $_SESSION['authenticated'] = true;
2126                 $_SESSION['uid'] = $contact['uid'];
2127
2128                 return (bool)$result;
2129         }
2130
2131         /**
2132          *
2133          * @param string $s
2134          * @param int    $uid
2135          * @param array  $item
2136          * @param int    $cid
2137          * @return string
2138          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2139          * @throws \ImagickException
2140          */
2141         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2142         {
2143                 if (DI::config()->get('system', 'disable_embedded')) {
2144                         return $s;
2145                 }
2146
2147                 Logger::info('check for photos');
2148                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
2149
2150                 $orig_body = $s;
2151                 $new_body = '';
2152
2153                 $img_start = strpos($orig_body, '[img');
2154                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2155                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2156
2157                 while (($img_st_close !== false) && ($img_len !== false)) {
2158                         $img_st_close++; // make it point to AFTER the closing bracket
2159                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2160
2161                         Logger::info('found photo', ['image' => $image]);
2162
2163                         if (stristr($image, $site . '/photo/')) {
2164                                 // Only embed locally hosted photos
2165                                 $replace = false;
2166                                 $i = basename($image);
2167                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2168                                 $x = strpos($i, '-');
2169
2170                                 if ($x) {
2171                                         $res = substr($i, $x + 1);
2172                                         $i = substr($i, 0, $x);
2173                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2174                                         if (DBA::isResult($photo)) {
2175                                                 /*
2176                                                  * Check to see if we should replace this photo link with an embedded image
2177                                                  * 1. No need to do so if the photo is public
2178                                                  * 2. If there's a contact-id provided, see if they're in the access list
2179                                                  *    for the photo. If so, embed it.
2180                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2181                                                  *    permissions, regardless of order but first check to see if they're an exact
2182                                                  *    match to save some processing overhead.
2183                                                  */
2184                                                 if (self::hasPermissions($photo)) {
2185                                                         if ($cid) {
2186                                                                 $recips = self::enumeratePermissions($photo);
2187                                                                 if (in_array($cid, $recips)) {
2188                                                                         $replace = true;
2189                                                                 }
2190                                                         } elseif ($item) {
2191                                                                 if (self::samePermissions($uid, $item, $photo)) {
2192                                                                         $replace = true;
2193                                                                 }
2194                                                         }
2195                                                 }
2196                                                 if ($replace) {
2197                                                         $photo_img = Photo::getImageForPhoto($photo);
2198                                                         // If a custom width and height were specified, apply before embedding
2199                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2200                                                                 Logger::info('scaling photo');
2201
2202                                                                 $width = intval($match[1]);
2203                                                                 $height = intval($match[2]);
2204
2205                                                                 $photo_img->scaleDown(max($width, $height));
2206                                                         }
2207
2208                                                         $data = $photo_img->asString();
2209                                                         $type = $photo_img->getType();
2210
2211                                                         Logger::info('replacing photo');
2212                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2213                                                         Logger::debug('replaced', ['image' => $image]);
2214                                                 }
2215                                         }
2216                                 }
2217                         }
2218
2219                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2220                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2221                         if ($orig_body === false) {
2222                                 $orig_body = '';
2223                         }
2224
2225                         $img_start = strpos($orig_body, '[img');
2226                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2227                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2228                 }
2229
2230                 $new_body = $new_body . $orig_body;
2231
2232                 return $new_body;
2233         }
2234
2235         private static function hasPermissions($obj)
2236         {
2237                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2238                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2239         }
2240
2241         private static function samePermissions($uid, $obj1, $obj2)
2242         {
2243                 // first part is easy. Check that these are exactly the same.
2244                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2245                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2246                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2247                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2248                         return true;
2249                 }
2250
2251                 // This is harder. Parse all the permissions and compare the resulting set.
2252                 $recipients1 = self::enumeratePermissions($obj1);
2253                 $recipients2 = self::enumeratePermissions($obj2);
2254                 sort($recipients1);
2255                 sort($recipients2);
2256
2257                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2258                 return ($recipients1 == $recipients2);
2259         }
2260
2261         /**
2262          * Returns an array of contact-ids that are allowed to see this object
2263          *
2264          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2265          * @param bool  $check_dead Prunes unavailable contacts from the result
2266          * @return array
2267          * @throws \Exception
2268          */
2269         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2270         {
2271                 $aclFormater = DI::aclFormatter();
2272
2273                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2274                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2275                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2276                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2277                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2278                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2279                 $recipients   = array_diff($recipients, $deny);
2280                 return $recipients;
2281         }
2282
2283         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2284         {
2285                 if (!$uid || ($days < 1)) {
2286                         return;
2287                 }
2288
2289                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2290                         $uid, GRAVITY_PARENT];
2291
2292                 /*
2293                  * $expire_network_only = save your own wall posts
2294                  * and just expire conversations started by others
2295                  */
2296                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2297
2298                 if ($expire_network_only) {
2299                         $condition[0] .= " AND NOT `wall`";
2300                 }
2301
2302                 if ($network != "") {
2303                         $condition[0] .= " AND `network` = ?";
2304                         $condition[] = $network;
2305                 }
2306
2307                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2308                 $condition[] = $days;
2309
2310                 $items = Post::select(['resource-id', 'starred', 'type', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2311
2312                 if (!DBA::isResult($items)) {
2313                         return;
2314                 }
2315
2316                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2317
2318                 // Forcing expiring of items - but not notes and marked items
2319                 if ($force) {
2320                         $expire_items = true;
2321                 }
2322
2323                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2324                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2325                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2326
2327                 $expired = 0;
2328
2329                 $priority = DI::config()->get('system', 'expire-notify-priority');
2330
2331                 while ($item = Post::fetch($items)) {
2332                         // don't expire filed items
2333                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2334                                 continue;
2335                         }
2336
2337                         // Only expire posts, not photos and photo comments
2338
2339                         if (!$expire_photos && strlen($item['resource-id'])) {
2340                                 continue;
2341                         } elseif (!$expire_starred && intval($item['starred'])) {
2342                                 continue;
2343                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == self::PT_PERSONAL_NOTE))) {
2344                                 continue;
2345                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2346                                 continue;
2347                         }
2348
2349                         self::markForDeletionById($item['id'], $priority);
2350
2351                         ++$expired;
2352                 }
2353                 DBA::close($items);
2354                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2355         }
2356
2357         public static function firstPostDate($uid, $wall = false)
2358         {
2359                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2360                 $params = ['order' => ['received' => false]];
2361                 $thread = DBA::selectFirst('thread', ['received'], $condition, $params);
2362                 if (DBA::isResult($thread)) {
2363                         return substr(DateTimeFormat::local($thread['received']), 0, 10);
2364                 }
2365                 return false;
2366         }
2367
2368         /**
2369          * add/remove activity to an item
2370          *
2371          * Toggle activities as like,dislike,attend of an item
2372          *
2373          * @param int $item_id
2374          * @param string $verb
2375          *            Activity verb. One of
2376          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2377          *            attendno, unattendno, attendmaybe, unattendmaybe,
2378          *            announce, unannouce
2379          * @return bool
2380          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2381          * @throws \ImagickException
2382          * @hook  'post_local_end'
2383          *            array $arr
2384          *            'post_id' => ID of posted item
2385          */
2386         public static function performActivity(int $item_id, string $verb, int $uid)
2387         {
2388                 if (empty($uid)) {
2389                         return false;
2390                 }
2391
2392                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2393
2394                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2395                 if (!DBA::isResult($item)) {
2396                         Logger::log('like: unknown item ' . $item_id);
2397                         return false;
2398                 }
2399
2400                 $uri_id = $item['uri-id'];
2401
2402                 if (!in_array($item['uid'], [0, $uid])) {
2403                         return false;
2404                 }
2405
2406                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2407                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2408                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2409                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2410                                 if (!DBA::isResult($item)) {
2411                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'uri-id' => $uri_id]);
2412                                         return false;
2413                                 }
2414                         }
2415                 }
2416
2417                 // Retrieves the local post owner
2418                 $owner = User::getOwnerDataById($uid);
2419                 if (empty($owner)) {
2420                         Logger::info('Empty owner for user', ['uid' => $uid]);
2421                         return false;
2422                 }
2423
2424                 // Retrieve the current logged in user's public contact
2425                 $author_id = Contact::getIdForURL($owner['url']);
2426                 if (empty($author_id)) {
2427                         Logger::info('Empty public contact');
2428                         return false;
2429                 }
2430
2431                 $activity = null;
2432                 switch ($verb) {
2433                         case 'like':
2434                         case 'unlike':
2435                                 $activity = Activity::LIKE;
2436                                 break;
2437                         case 'dislike':
2438                         case 'undislike':
2439                                 $activity = Activity::DISLIKE;
2440                                 break;
2441                         case 'attendyes':
2442                         case 'unattendyes':
2443                                 $activity = Activity::ATTEND;
2444                                 break;
2445                         case 'attendno':
2446                         case 'unattendno':
2447                                 $activity = Activity::ATTENDNO;
2448                                 break;
2449                         case 'attendmaybe':
2450                         case 'unattendmaybe':
2451                                 $activity = Activity::ATTENDMAYBE;
2452                                 break;
2453                         case 'follow':
2454                         case 'unfollow':
2455                                 $activity = Activity::FOLLOW;
2456                                 break;
2457                         case 'announce':
2458                         case 'unannounce':
2459                                 $activity = Activity::ANNOUNCE;
2460                                 break;
2461                         default:
2462                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2463                                 return false;
2464                 }
2465
2466                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2467
2468                 // Enable activity toggling instead of on/off
2469                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2470
2471                 // Look for an existing verb row
2472                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2473                 if ($event_verb_flag) {
2474                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2475
2476                         // Translate to the index based activity index
2477                         $vids = [];
2478                         foreach ($verbs as $verb) {
2479                                 $vids[] = Verb::getID($verb);
2480                         }
2481                 } else {
2482                         $vids = Verb::getID($activity);
2483                 }
2484
2485                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2486                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent-id' => $uri_id];
2487                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2488
2489                 if (DBA::isResult($like_item)) {
2490                         /**
2491                          * Truth table for existing activities
2492                          *
2493                          * |          Inputs            ||      Outputs      |
2494                          * |----------------------------||-------------------|
2495                          * |  Mode  | Event | Same verb || Delete? | Return? |
2496                          * |--------|-------|-----------||---------|---------|
2497                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2498                          * | create |  Yes  |    No     ||   Yes   |   No    |
2499                          * | create |  No   |    Yes    ||   No    |   Yes   |
2500                          * | create |  No   |    No     ||        N/A†       |
2501                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2502                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2503                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2504                          * | delete |  No   |    No     ||        N/A†       |
2505                          * |--------|-------|-----------||---------|---------|
2506                          * |   A    |   B   |     C     || A xor C | !B or C |
2507                          *
2508                          * † Can't happen: It's impossible to find an existing non-event activity without
2509                          *                 the same verb because we are only looking for this single verb.
2510                          *
2511                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2512                          */
2513                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2514                                 self::markForDeletionById($like_item['id']);
2515                         }
2516
2517                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2518                                 return true;
2519                         }
2520                 }
2521
2522                 // No need to go further if we aren't creating anything
2523                 if ($mode == 'delete') {
2524                         return true;
2525                 }
2526
2527                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2528
2529                 $new_item = [
2530                         'guid'          => System::createUUID(),
2531                         'uri'           => self::newURI($item['uid']),
2532                         'uid'           => $item['uid'],
2533                         'contact-id'    => $owner['id'],
2534                         'wall'          => $item['wall'],
2535                         'origin'        => 1,
2536                         'network'       => Protocol::DFRN,
2537                         'protocol'      => Conversation::PARCEL_DIRECT,
2538                         'direction'     => Conversation::PUSH,
2539                         'gravity'       => GRAVITY_ACTIVITY,
2540                         'parent'        => $item['id'],
2541                         'thr-parent'    => $item['uri'],
2542                         'owner-id'      => $author_id,
2543                         'author-id'     => $author_id,
2544                         'body'          => $activity,
2545                         'verb'          => $activity,
2546                         'object-type'   => $objtype,
2547                         'allow_cid'     => $item['allow_cid'],
2548                         'allow_gid'     => $item['allow_gid'],
2549                         'deny_cid'      => $item['deny_cid'],
2550                         'deny_gid'      => $item['deny_gid'],
2551                         'visible'       => 1,
2552                         'unseen'        => 1,
2553                 ];
2554
2555                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2556                 if (!empty($signed)) {
2557                         $new_item['diaspora_signed_text'] = json_encode($signed);
2558                 }
2559
2560                 $new_item_id = self::insert($new_item);
2561
2562                 // If the parent item isn't visible then set it to visible
2563                 if (!$item['visible']) {
2564                         self::update(['visible' => true], ['id' => $item['id']]);
2565                 }
2566
2567                 $new_item['id'] = $new_item_id;
2568
2569                 Hook::callAll('post_local_end', $new_item);
2570
2571                 return true;
2572         }
2573
2574         private static function addThread($itemid, $onlyshadow = false)
2575         {
2576                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2577                         'moderated', 'visible', 'starred', 'contact-id', 'post-type', 'uri-id',
2578                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2579                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2580                 $item = Post::selectFirst($fields, $condition);
2581
2582                 if (!DBA::isResult($item)) {
2583                         return;
2584                 }
2585
2586                 $item['iid'] = $itemid;
2587
2588                 if (!$onlyshadow) {
2589                         $result = DBA::replace('thread', $item);
2590
2591                         Logger::info('Add thread', ['item' => $itemid, 'result' => $result]);
2592                 }
2593         }
2594
2595         private static function updateThread($itemid, $setmention = false)
2596         {
2597                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
2598                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id', 'uri-id',
2599                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
2600
2601                 $item = Post::selectFirst($fields, ['id' => $itemid, 'gravity' => GRAVITY_PARENT]);
2602                 if (!DBA::isResult($item)) {
2603                         return;
2604                 }
2605
2606                 if ($setmention) {
2607                         $item["mention"] = 1;
2608                 }
2609
2610                 $fields = [];
2611
2612                 foreach ($item as $field => $data) {
2613                         if (!in_array($field, ["guid"])) {
2614                                 $fields[$field] = $data;
2615                         }
2616                 }
2617
2618                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
2619
2620                 Logger::info('Update thread', ['item' => $itemid, 'guid' => $item["guid"], 'result' => $result]);
2621         }
2622
2623         private static function deleteThread($itemid, $uri_id)
2624         {
2625                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2626                 if (!DBA::isResult($item)) {
2627                         Logger::info('No thread found', ['id' => $itemid]);
2628                         return;
2629                 }
2630
2631                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
2632
2633                 Logger::info('Deleted thread', ['item' => $itemid, 'result' => $result]);
2634
2635                 $condition = ["`uri-id` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $uri_id, $item["uid"]];
2636                 if (!Post::exists($condition)) {
2637                         DBA::delete('item', ['uri-id' => $uri_id, 'uid' => 0]);
2638                         Post\User::delete(['uri-id' => $uri_id, 'uid' => 0]);
2639                         Logger::debug('Deleted shadow item', ['id' => $itemid, 'uri-id' => $uri_id]);
2640                 }
2641         }
2642
2643         /**
2644          * Fetch the SQL condition for the given user id
2645          *
2646          * @param integer $owner_id User ID for which the permissions should be fetched
2647          * @return array condition
2648          */
2649         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2650         {
2651                 $local_user = local_user();
2652                 $remote_user = Session::getRemoteContactID($owner_id);
2653
2654                 // default permissions - anonymous user
2655                 $condition = ["`private` != ?", self::PRIVATE];
2656
2657                 if ($local_user && ($local_user == $owner_id)) {
2658                         // Profile owner - everything is visible
2659                         $condition = [];
2660                 } elseif ($remote_user) {
2661                          // Authenticated visitor - fetch the matching permissionsets
2662                         $set = PermissionSet::get($owner_id, $remote_user);
2663                         if (!empty($set)) {
2664                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2665                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2666                                         self::PRIVATE, self::PRIVATE];
2667                                 $condition = array_merge($condition, $set);
2668                         }
2669                 }
2670
2671                 return $condition;
2672         }
2673
2674         /**
2675          * Get a permission SQL string for the given user
2676          *
2677          * @param int $owner_id
2678          * @param string $table
2679          * @return string
2680          */
2681         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2682         {
2683                 $local_user = local_user();
2684                 $remote_user = Session::getRemoteContactID($owner_id);
2685
2686                 if (!empty($table)) {
2687                         $table = DBA::quoteIdentifier($table) . '.';
2688                 }
2689
2690                 /*
2691                  * Construct permissions
2692                  *
2693                  * default permissions - anonymous user
2694                  */
2695                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2696
2697                 // Profile owner - everything is visible
2698                 if ($local_user && ($local_user == $owner_id)) {
2699                         $sql = '';
2700                 } elseif ($remote_user) {
2701                         /*
2702                          * Authenticated visitor. Unless pre-verified,
2703                          * check that the contact belongs to this $owner_id
2704                          * and load the groups the visitor belongs to.
2705                          * If pre-verified, the caller is expected to have already
2706                          * done this and passed the groups into this function.
2707                          */
2708                         $set = PermissionSet::get($owner_id, $remote_user);
2709
2710                         if (!empty($set)) {
2711                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2712                         } else {
2713                                 $sql_set = '';
2714                         }
2715
2716                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2717                 }
2718
2719                 return $sql;
2720         }
2721
2722         /**
2723          * get translated item type
2724          *
2725          * @param $item
2726          * @return string
2727          */
2728         public static function postType($item)
2729         {
2730                 if (!empty($item['event-id'])) {
2731                         return DI::l10n()->t('event');
2732                 } elseif (!empty($item['resource-id'])) {
2733                         return DI::l10n()->t('photo');
2734                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2735                         return DI::l10n()->t('activity');
2736                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2737                         return DI::l10n()->t('comment');
2738                 }
2739
2740                 return DI::l10n()->t('post');
2741         }
2742
2743         /**
2744          * Sets the "rendered-html" field of the provided item
2745          *
2746          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2747          *
2748          * @param array $item
2749          * @param bool  $update
2750          *
2751          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2752          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2753          */
2754         public static function putInCache(&$item, $update = false)
2755         {
2756                 // Save original body to prevent addons to modify it
2757                 $body = $item['body'];
2758
2759                 $rendered_hash = $item['rendered-hash'] ?? '';
2760                 $rendered_html = $item['rendered-html'] ?? '';
2761
2762                 if ($rendered_hash == ''
2763                         || $rendered_html == ''
2764                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2765                         || DI::config()->get('system', 'ignore_cache')
2766                 ) {
2767                         self::addRedirToImageTags($item);
2768
2769                         $item['rendered-html'] = BBCode::convert($item['body']);
2770                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2771
2772                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2773                         Hook::callAll('put_item_in_cache', $hook_data);
2774                         $item['rendered-html'] = $hook_data['rendered-html'];
2775                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2776                         unset($hook_data);
2777
2778                         // Force an update if the generated values differ from the existing ones
2779                         if ($rendered_hash != $item['rendered-hash']) {
2780                                 $update = true;
2781                         }
2782
2783                         // Only compare the HTML when we forcefully ignore the cache
2784                         if (DI::config()->get('system', 'ignore_cache') && ($rendered_html != $item['rendered-html'])) {
2785                                 $update = true;
2786                         }
2787
2788                         if ($update && !empty($item['id'])) {
2789                                 self::update(
2790                                         [
2791                                                 'rendered-html' => $item['rendered-html'],
2792                                                 'rendered-hash' => $item['rendered-hash']
2793                                         ],
2794                                         ['id' => $item['id']]
2795                                 );
2796                         }
2797                 }
2798
2799                 $item['body'] = $body;
2800         }
2801
2802         /**
2803          * Find any non-embedded images in private items and add redir links to them
2804          *
2805          * @param array &$item The field array of an item row
2806          */
2807         private static function addRedirToImageTags(array &$item)
2808         {
2809                 $app = DI::app();
2810
2811                 $matches = [];
2812                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2813                 if ($cnt) {
2814                         foreach ($matches as $mtch) {
2815                                 if (strpos($mtch[1], '/redir') !== false) {
2816                                         continue;
2817                                 }
2818
2819                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2820                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2821                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2822                                 }
2823                         }
2824                 }
2825         }
2826
2827         /**
2828          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2829          * If attach is true, also add icons for item attachments.
2830          *
2831          * @param array   $item
2832          * @param boolean $attach
2833          * @param boolean $is_preview
2834          * @return string item body html
2835          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2836          * @throws \ImagickException
2837          * @hook  prepare_body_init item array before any work
2838          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2839          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2840          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2841          */
2842         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2843         {
2844                 $a = DI::app();
2845                 Hook::callAll('prepare_body_init', $item);
2846
2847                 // In order to provide theme developers more possibilities, event items
2848                 // are treated differently.
2849                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2850                         $ev = Event::getItemHTML($item);
2851                         return $ev;
2852                 }
2853
2854                 $tags = Tag::populateFromItem($item);
2855
2856                 $item['tags'] = $tags['tags'];
2857                 $item['hashtags'] = $tags['hashtags'];
2858                 $item['mentions'] = $tags['mentions'];
2859
2860                 // Compile eventual content filter reasons
2861                 $filter_reasons = [];
2862                 if (!$is_preview && public_contact() != $item['author-id']) {
2863                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2864                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2865                         }
2866
2867                         $hook_data = [
2868                                 'item' => $item,
2869                                 'filter_reasons' => $filter_reasons
2870                         ];
2871                         Hook::callAll('prepare_body_content_filter', $hook_data);
2872                         $filter_reasons = $hook_data['filter_reasons'];
2873                         unset($hook_data);
2874                 }
2875
2876                 // Update the cached values if there is no "zrl=..." on the links.
2877                 $update = (!Session::isAuthenticated() && ($item["uid"] == 0));
2878
2879                 // Or update it if the current viewer is the intented viewer.
2880                 if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
2881                         $update = true;
2882                 }
2883
2884                 self::putInCache($item, $update);
2885                 $s = $item["rendered-html"];
2886
2887                 $hook_data = [
2888                         'item' => $item,
2889                         'html' => $s,
2890                         'preview' => $is_preview,
2891                         'filter_reasons' => $filter_reasons
2892                 ];
2893                 Hook::callAll('prepare_body', $hook_data);
2894                 $s = $hook_data['html'];
2895                 unset($hook_data);
2896
2897                 if (!$attach) {
2898                         // Replace the blockquotes with quotes that are used in mails.
2899                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2900                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2901                         return $s;
2902                 }
2903
2904                 $as = '';
2905                 $vhead = false;
2906                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2907                         $mime = $attachment['mimetype'];
2908
2909                         $the_url = Contact::magicLinkById($item['author-id'], $attachment['url']);
2910
2911                         if (strpos($mime, 'video') !== false) {
2912                                 if (!$vhead) {
2913                                         $vhead = true;
2914                                         DI::page()['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
2915                                 }
2916
2917                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2918                                         '$video' => [
2919                                                 'id'     => $item['author-id'],
2920                                                 'title'  => DI::l10n()->t('View Video'),
2921                                                 'src'    => $the_url,
2922                                                 'mime'   => $mime,
2923                                         ],
2924                                 ]);
2925                         }
2926
2927                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2928                         if ($filetype) {
2929                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
2930                                 $filesubtype = str_replace('.', '-', $filesubtype);
2931                         } else {
2932                                 $filetype = 'unkn';
2933                                 $filesubtype = 'unkn';
2934                         }
2935
2936                         $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
2937                         $title .= ' ' . ($attachment['size'] ?? 0) . ' ' . DI::l10n()->t('bytes');
2938
2939                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
2940                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
2941                 }
2942
2943                 if ($as != '') {
2944                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
2945                 }
2946
2947                 // Map.
2948                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2949                         $x = Map::byCoordinates(trim($item['coord']));
2950                         if ($x) {
2951                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2952                         }
2953                 }
2954
2955                 // Replace friendica image url size with theme preference.
2956                 if (!empty($a->theme_info['item_image_size'])) {
2957                         $ps = $a->theme_info['item_image_size'];
2958                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2959                 }
2960
2961                 $s = HTML::applyContentFilter($s, $filter_reasons);
2962
2963                 $hook_data = ['item' => $item, 'html' => $s];
2964                 Hook::callAll('prepare_body_final', $hook_data);
2965
2966                 return $hook_data['html'];
2967         }
2968
2969         /**
2970          * get private link for item
2971          *
2972          * @param array $item
2973          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
2974          * @throws \Exception
2975          */
2976         public static function getPlink($item)
2977         {
2978                 if (local_user()) {
2979                         $ret = [
2980                                 'href' => "display/" . $item['guid'],
2981                                 'orig' => "display/" . $item['guid'],
2982                                 'title' => DI::l10n()->t('View on separate page'),
2983                                 'orig_title' => DI::l10n()->t('view on separate page'),
2984                         ];
2985
2986                         if (!empty($item['plink'])) {
2987                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
2988                                 $ret["title"] = DI::l10n()->t('link to source');
2989                         }
2990                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
2991                         $ret = [
2992                                 'href' => $item['plink'],
2993                                 'orig' => $item['plink'],
2994                                 'title' => DI::l10n()->t('link to source'),
2995                         ];
2996                 } else {
2997                         $ret = [];
2998                 }
2999
3000                 return $ret;
3001         }
3002
3003         /**
3004          * Is the given item array a post that is sent as starting post to a forum?
3005          *
3006          * @param array $item
3007          * @param array $owner
3008          *
3009          * @return boolean "true" when it is a forum post
3010          */
3011         public static function isForumPost(array $item, array $owner = [])
3012         {
3013                 if (empty($owner)) {
3014                         $owner = User::getOwnerDataById($item['uid']);
3015                         if (empty($owner)) {
3016                                 return false;
3017                         }
3018                 }
3019
3020                 if (($item['author-id'] == $item['owner-id']) ||
3021                         ($owner['id'] == $item['contact-id']) ||
3022                         ($item['uri-id'] != $item['parent-uri-id']) ||
3023                         $item['origin']) {
3024                         return false;
3025                 }
3026
3027                 return Contact::isForum($item['contact-id']);
3028         }
3029
3030         /**
3031          * Search item id for given URI or plink
3032          *
3033          * @param string $uri
3034          * @param integer $uid
3035          *
3036          * @return integer item id
3037          */
3038         public static function searchByLink($uri, $uid = 0)
3039         {
3040                 $ssl_uri = str_replace('http://', 'https://', $uri);
3041                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3042
3043                 $item = Post::selectFirst(['id'], ['uri' => $uris, 'uid' => $uid]);
3044                 if (DBA::isResult($item)) {
3045                         return $item['id'];
3046                 }
3047
3048                 $item = Post::selectFirst(['id'], ['plink' => $uris, 'uid' => $uid]);
3049                 if (DBA::isResult($item)) {
3050                         return $item['id'];
3051                 }
3052
3053                 return 0;
3054         }
3055
3056         /**
3057          * Return the URI for a link to the post
3058          *
3059          * @param string $uri URI or link to post
3060          *
3061          * @return string URI
3062          */
3063         public static function getURIByLink(string $uri)
3064         {
3065                 $ssl_uri = str_replace('http://', 'https://', $uri);
3066                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3067
3068                 $item = Post::selectFirst(['uri'], ['uri' => $uris]);
3069                 if (DBA::isResult($item)) {
3070                         return $item['uri'];
3071                 }
3072
3073                 $item = Post::selectFirst(['uri'], ['plink' => $uris]);
3074                 if (DBA::isResult($item)) {
3075                         return $item['uri'];
3076                 }
3077
3078                 return '';
3079         }
3080
3081         /**
3082          * Fetches item for given URI or plink
3083          *
3084          * @param string $uri
3085          * @param integer $uid
3086          *
3087          * @return integer item id
3088          */
3089         public static function fetchByLink(string $uri, int $uid = 0)
3090         {
3091                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
3092                 $item_id = self::searchByLink($uri, $uid);
3093                 if (!empty($item_id)) {
3094                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3095                         return $item_id;
3096                 }
3097
3098                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
3099                         $item_id = self::searchByLink($fetched_uri, $uid);
3100                 } else {
3101                         $item_id = Diaspora::fetchByURL($uri);
3102                 }
3103
3104                 if (!empty($item_id)) {
3105                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3106                         return $item_id;
3107                 }
3108
3109                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
3110                 return 0;
3111         }
3112
3113         /**
3114          * Return share data from an item array (if the item is shared item)
3115          * We are providing the complete Item array, because at some time in the future
3116          * we hopefully will define these values not in the body anymore but in some item fields.
3117          * This function is meant to replace all similar functions in the system.
3118          *
3119          * @param array $item
3120          *
3121          * @return array with share information
3122          */
3123         public static function getShareArray($item)
3124         {
3125                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
3126                         return [];
3127                 }
3128
3129                 $attribute_string = $matches[2];
3130                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
3131                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
3132                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
3133                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
3134                         }
3135                 }
3136                 return $attributes;
3137         }
3138
3139         /**
3140          * Fetch item information for shared items from the original items and adds it.
3141          *
3142          * @param array $item
3143          *
3144          * @return array item array with data from the original item
3145          */
3146         public static function addShareDataFromOriginal(array $item)
3147         {
3148                 $shared = self::getShareArray($item);
3149                 if (empty($shared)) {
3150                         return $item;
3151                 }
3152
3153                 // Real reshares always have got a GUID.
3154                 if (empty($shared['guid'])) {
3155                         return $item;
3156                 }
3157
3158                 $uid = $item['uid'] ?? 0;
3159
3160                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
3161                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
3162                 if (!DBA::isResult($shared_item)) {
3163                         if (empty($shared['link'])) {
3164                                 return $item;
3165                         }
3166
3167                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
3168                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
3169                         if (empty($id)) {
3170                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
3171                                 return $item;
3172                         }
3173
3174                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
3175                         if (!DBA::isResult($shared_item)) {
3176                                 return $item;
3177                         }
3178                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
3179                 } else {
3180                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
3181                 }
3182
3183                 if (!empty($shared_item['title'])) {
3184                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
3185                         unset($shared_item['title']);
3186                 } else {
3187                         $body = $shared_item['body'];
3188                 }
3189
3190                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
3191                 unset($shared_item['body']);
3192
3193                 return array_merge($item, $shared_item);
3194         }
3195
3196         /**
3197          * Check a prospective item array against user-level permissions
3198          *
3199          * @param array $item Expected keys: uri, gravity, and
3200          *                    author-link if is author-id is set,
3201          *                    owner-link if is owner-id is set,
3202          *                    causer-link if is causer-id is set.
3203          * @param int   $user_id Local user ID
3204          * @return bool
3205          * @throws \Exception
3206          */
3207         protected static function isAllowedByUser(array $item, int $user_id)
3208         {
3209                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3210                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3211                         return false;
3212                 }
3213
3214                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3215                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3216                         return false;
3217                 }
3218
3219                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3220                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3221                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3222                         return false;
3223                 }
3224
3225                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3226                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3227                         return false;
3228                 }
3229
3230                 return true;
3231         }
3232 }