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', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network', 'gravity',
  77                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  78                 'wall', 'private', 'starred', 'origin', 'title', 'body', 'language',
  79                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  80                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  81                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  82                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
  83                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type',
  84                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  85                 'writable', 'self', 'cid', 'alias',
  86                 'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  87                 'event-summary', 'event-desc', 'event-location', 'event-type',
  88                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  89                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  90         ];
  91
  92         // Field list that is used to deliver items via the protocols
  93         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  94                         'parent-guid', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  95                         'private', 'title', 'body', 'location', 'coord', 'app',
  96                         'deleted', 'extid', 'post-type', 'gravity',
  97                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  98                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  99                         'signed_text', 'network'];
 100
 101         // Field list for "item-content" table that is mixed with the item table
 102         const MIXED_CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
 103                         'coord', 'app', 'rendered-hash', 'rendered-html', 'verb',
 104                         'object-type', 'object', 'target-type', 'target', 'plink'];
 105
 106         // Field list for "item-content" table that is not present in the "item" table
 107         const CONTENT_FIELDLIST = ['language', 'raw-body'];
 108
 109         // All fields in the item table
 110         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 111                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 112                         'contact-id', 'type', 'wall', 'gravity', 'extid', 'psid',
 113                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 114                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 115                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
 116                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 117                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 118                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 119                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 120                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 121                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 122
 123         // List of all verbs that don't need additional content data.
 124         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 125         const ACTIVITIES = [
 126                 Activity::LIKE, Activity::DISLIKE,
 127                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 128                 Activity::FOLLOW,
 129                 Activity::ANNOUNCE];
 130
 131         const PUBLIC = 0;
 132         const PRIVATE = 1;
 133         const UNLISTED = 2;
 134
 135         const TABLES = ['item', 'user-item', 'item-content', 'post-delivery-data', 'diaspora-interaction'];
 136
 137         private static function getItemFields()
 138         {
 139                 $definition = DBStructure::definition('', false);
 140
 141                 $postfields = [];
 142                 foreach (self::TABLES as $table) {
 143                         $postfields[$table] = array_keys($definition[$table]['fields']);
 144                 }
 145
 146                 return $postfields;
 147         }
 148
 149         /**
 150          * Set the pinned state of an item
 151          *
 152          * @param integer $iid    Item ID
 153          * @param integer $uid    User ID
 154          * @param boolean $pinned Pinned state
 155          */
 156         public static function setPinned(int $iid, int $uid, bool $pinned)
 157         {
 158                 DBA::update('user-item', ['pinned' => $pinned], ['iid' => $iid, 'uid' => $uid], true);
 159         }
 160
 161         /**
 162          * Get the pinned state
 163          *
 164          * @param integer $iid Item ID
 165          * @param integer $uid User ID
 166          *
 167          * @return boolean pinned state
 168          */
 169         public static function getPinned(int $iid, int $uid)
 170         {
 171                 $useritem = DBA::selectFirst('user-item', ['pinned'], ['iid' => $iid, 'uid' => $uid]);
 172                 if (!DBA::isResult($useritem)) {
 173                         return false;
 174                 }
 175                 return (bool)$useritem['pinned'];
 176         }
 177
 178         /**
 179          * Update existing item entries
 180          *
 181          * @param array $fields    The fields that are to be changed
 182          * @param array $condition The condition for finding the item entries
 183          *
 184          * In the future we may have to change permissions as well.
 185          * Then we had to add the user id as third parameter.
 186          *
 187          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 188          *
 189          * @return integer|boolean number of affected rows - or "false" if there was an error
 190          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 191          */
 192         public static function update(array $fields, array $condition)
 193         {
 194                 if (empty($condition) || empty($fields)) {
 195                         return false;
 196                 }
 197
 198                 $data_fields = $fields;
 199
 200                 // To ensure the data integrity we do it in an transaction
 201                 DBA::transaction();
 202
 203                 // We cannot simply expand the condition to check for origin entries
 204                 // The condition needn't to be a simple array but could be a complex condition.
 205                 // And we have to execute this query before the update to ensure to fetch the same data.
 206                 $items = DBA::select('item', ['id', 'origin', 'uri', 'uri-id', 'uid'], $condition);
 207
 208                 $content_fields = [];
 209                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
 210                         if (isset($fields[$field])) {
 211                                 $content_fields[$field] = $fields[$field];
 212                                 unset($fields[$field]);
 213                         }
 214                 }
 215
 216                 $delivery_data = Post\DeliveryData::extractFields($fields);
 217
 218                 $clear_fields = ['bookmark', 'type', 'author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link', 'postopts', 'inform'];
 219                 foreach ($clear_fields as $field) {
 220                         unset($fields[$field]);
 221                 }
 222
 223                 if (array_key_exists('file', $fields)) {
 224                         $files = $fields['file'];
 225                         unset($fields['file']);
 226                 } else {
 227                         $files = null;
 228                 }
 229
 230                 if (!empty($content_fields['verb'])) {
 231                         $fields['vid'] = Verb::getID($content_fields['verb']);
 232                 }
 233
 234                 if (!empty($fields)) {
 235                         $success = DBA::update('item', $fields, $condition);
 236
 237                         if (!$success) {
 238                                 DBA::close($items);
 239                                 DBA::rollback();
 240                                 return false;
 241                         }
 242                 }
 243
 244                 // When there is no content for the "old" item table, this will count the fetched items
 245                 $rows = DBA::affectedRows();
 246
 247                 $notify_items = [];
 248
 249                 while ($item = DBA::fetch($items)) {
 250                         Post\User::update($item['uri-id'], $item['uid'], $data_fields);
 251
 252                         if (empty($content_fields['verb']) || !in_array($content_fields['verb'], self::ACTIVITIES)) {
 253                                 if (!empty($content_fields['body'])) {
 254                                         $content_fields['raw-body'] = trim($content_fields['raw-body'] ?? $content_fields['body']);
 255
 256                                         // Remove all media attachments from the body and store them in the post-media table
 257                                         $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 258                                         $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 259                                 }
 260
 261                                 self::updateContent($content_fields, ['uri-id' => $item['uri-id']]);
 262                         }
 263
 264                         if (!is_null($files)) {
 265                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $files);
 266                         }
 267
 268                         if (!empty($fields['attach'])) {
 269                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 270                         }
 271
 272                         Post\DeliveryData::update($item['uri-id'], $delivery_data);
 273
 274                         self::updateThread($item['id']);
 275
 276                         // We only need to notfiy others when it is an original entry from us.
 277                         // Only call the notifier when the item has some content relevant change.
 278                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 279                                 $notify_items[] = $item['id'];
 280                         }
 281                 }
 282
 283                 DBA::close($items);
 284                 DBA::commit();
 285
 286                 foreach ($notify_items as $notify_item) {
 287                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $notify_item);
 288                 }
 289
 290                 return $rows;
 291         }
 292
 293         /**
 294          * Delete an item and notify others about it - if it was ours
 295          *
 296          * @param array   $condition The condition for finding the item entries
 297          * @param integer $priority  Priority for the notification
 298          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 299          */
 300         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 301         {
 302                 $items = Post::select(['id'], $condition);
 303                 while ($item = Post::fetch($items)) {
 304                         self::markForDeletionById($item['id'], $priority);
 305                 }
 306                 DBA::close($items);
 307         }
 308
 309         /**
 310          * Delete an item for an user and notify others about it - if it was ours
 311          *
 312          * @param array   $condition The condition for finding the item entries
 313          * @param integer $uid       User who wants to delete this item
 314          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 315          */
 316         public static function deleteForUser($condition, $uid)
 317         {
 318                 if ($uid == 0) {
 319                         return;
 320                 }
 321
 322                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 323                 while ($item = Post::fetch($items)) {
 324                         if (in_array($item['uid'], [$uid, 0])) {
 325                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 326                         }
 327
 328                         // "Deleting" global items just means hiding them
 329                         if ($item['uid'] == 0) {
 330                                 DBA::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
 331                         } elseif ($item['uid'] == $uid) {
 332                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 333                         } else {
 334                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
 335                         }
 336                 }
 337                 DBA::close($items);
 338         }
 339
 340         /**
 341          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 342          *
 343          * @param integer $item_id
 344          * @param integer $priority Priority for the notification
 345          *
 346          * @return boolean success
 347          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 348          */
 349         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 350         {
 351                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 352                 // locate item to be deleted
 353                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri', 'origin',
 354                         'deleted', 'resource-id', 'event-id',
 355                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 356                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 357                 if (!DBA::isResult($item)) {
 358                         Logger::info('Item not found.', ['id' => $item_id]);
 359                         return false;
 360                 }
 361
 362                 if ($item['deleted']) {
 363                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 364                         return false;
 365                 }
 366
 367                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 368                 if (!DBA::isResult($parent)) {
 369                         $parent = ['origin' => false];
 370                 }
 371
 372                 // clean up categories and tags so they don't end up as orphans
 373                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 374
 375                 /*
 376                  * If item is a link to a photo resource, nuke all the associated photos
 377                  * (visitors will not have photo resources)
 378                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 379                  * generate a resource-id and therefore aren't intimately linked to the item.
 380                  */
 381                 /// @TODO: this should first check if photo is used elsewhere
 382                 if (strlen($item['resource-id'])) {
 383                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 384                 }
 385
 386                 // If item is a link to an event, delete the event.
 387                 if (intval($item['event-id'])) {
 388                         Event::delete($item['event-id']);
 389                 }
 390
 391                 // If item has attachments, drop them
 392                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 393                 foreach($attachments as $attachment) {
 394                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 395                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 396                         }
 397                 }
 398
 399                 // Set the item to "deleted"
 400                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 401                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 402
 403                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 404                 self::deleteThread($item['id'], $item['parent-uri']);
 405
 406                 if (!Post::exists(["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
 407                         self::markForDeletion(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
 408                 }
 409
 410                 Post\DeliveryData::delete($item['uri-id']);
 411
 412                 // When the permission set will be used in photo and events as well,
 413                 // this query here needs to be extended.
 414                 // @todo Currently deactivated. We need the permission set in the deletion process.
 415                 // This is a reminder to add the removal somewhere else.
 416                 //if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
 417                 //      DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
 418                 //}
 419
 420                 // If it's the parent of a comment thread, kill all the kids
 421                 if ($item['gravity'] == GRAVITY_PARENT) {
 422                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 423                 }
 424
 425                 // Is it our comment and/or our thread?
 426                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 427                         // When we delete the original post we will delete all existing copies on the server as well
 428                         self::markForDeletion(['uri' => $item['uri'], 'deleted' => false], $priority);
 429
 430                         // send the notification upstream/downstream
 431                         if ($priority) {
 432                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, intval($item['id']));
 433                         }
 434                 } elseif ($item['uid'] != 0) {
 435                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 436
 437                         // When we delete just our local user copy of an item, we have to set a marker to hide it
 438                         $global_item = Post::selectFirst(['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
 439                         if (DBA::isResult($global_item)) {
 440                                 DBA::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
 441                         }
 442                 }
 443
 444                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 445
 446                 return true;
 447         }
 448
 449
 450         private static function guid($item, $notify)
 451         {
 452                 if (!empty($item['guid'])) {
 453                         return Strings::escapeTags(trim($item['guid']));
 454                 }
 455
 456                 if ($notify) {
 457                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 458                         // We add the hash of our own host because our host is the original creator of the post.
 459                         $prefix_host = DI::baseUrl()->getHostname();
 460                 } else {
 461                         $prefix_host = '';
 462
 463                         // We are only storing the post so we create a GUID from the original hostname.
 464                         if (!empty($item['author-link'])) {
 465                                 $parsed = parse_url($item['author-link']);
 466                                 if (!empty($parsed['host'])) {
 467                                         $prefix_host = $parsed['host'];
 468                                 }
 469                         }
 470
 471                         if (empty($prefix_host) && !empty($item['plink'])) {
 472                                 $parsed = parse_url($item['plink']);
 473                                 if (!empty($parsed['host'])) {
 474                                         $prefix_host = $parsed['host'];
 475                                 }
 476                         }
 477
 478                         if (empty($prefix_host) && !empty($item['uri'])) {
 479                                 $parsed = parse_url($item['uri']);
 480                                 if (!empty($parsed['host'])) {
 481                                         $prefix_host = $parsed['host'];
 482                                 }
 483                         }
 484
 485                         // Is it in the format data@host.tld? - Used for mail contacts
 486                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 487                                 $mailparts = explode('@', $item['author-link']);
 488                                 $prefix_host = array_pop($mailparts);
 489                         }
 490                 }
 491
 492                 if (!empty($item['plink'])) {
 493                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 494                 } elseif (!empty($item['uri'])) {
 495                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 496                 } else {
 497                         $guid = System::createUUID(hash('crc32', $prefix_host));
 498                 }
 499
 500                 return $guid;
 501         }
 502
 503         private static function contactId($item)
 504         {
 505                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 506                         return $item['contact-id'];
 507                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 508                         return $item['contact-id'];
 509                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 510                         return $item['author-id'];
 511                 } elseif (!empty($item['contact-id'])) {
 512                         return $item['contact-id'];
 513                 } else {
 514                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 515                         if (!empty($contact_id)) {
 516                                 return $contact_id;
 517                         }
 518                 }
 519                 return $item['author-id'];
 520         }
 521
 522         /**
 523          * Write an item array into a spool file to be inserted later.
 524          * This command is called whenever there are issues storing an item.
 525          *
 526          * @param array $item The item fields that are to be inserted
 527          * @throws \Exception
 528          */
 529         private static function spool($orig_item)
 530         {
 531                 // Now we store the data in the spool directory
 532                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 533                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 534
 535                 $spoolpath = get_spoolpath();
 536                 if ($spoolpath != "") {
 537                         $spool = $spoolpath . '/' . $file;
 538
 539                         file_put_contents($spool, json_encode($orig_item));
 540                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 541                 }
 542         }
 543
 544         /**
 545          * Check if the item array is a duplicate
 546          *
 547          * @param array $item
 548          * @return boolean is it a duplicate?
 549          */
 550         private static function isDuplicate(array $item)
 551         {
 552                 // Checking if there is already an item with the same guid
 553                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 554                 if (Post::exists($condition)) {
 555                         Logger::notice('Found already existing item', [
 556                                 'guid' => $item['guid'],
 557                                 'uid' => $item['uid'],
 558                                 'network' => $item['network']
 559                         ]);
 560                         return true;
 561                 }
 562
 563                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
 564                         $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
 565                 if (Post::exists($condition)) {
 566                         Logger::notice('duplicated item with the same uri found.', $item);
 567                         return true;
 568                 }
 569
 570                 // On Friendica and Diaspora the GUID is unique
 571                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 572                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 573                         if (Post::exists($condition)) {
 574                                 Logger::notice('duplicated item with the same guid found.', $item);
 575                                 return true;
 576                         }
 577                 } elseif ($item['network'] == Protocol::OSTATUS) {
 578                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 579                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 580                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 581                         if (Post::exists($condition)) {
 582                                 Logger::notice('duplicated item with the same body found.', $item);
 583                                 return true;
 584                         }
 585                 }
 586
 587                 /*
 588                  * Check for already added items.
 589                  * There is a timing issue here that sometimes creates double postings.
 590                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 591                  */
 592                 if (($item['uid'] == 0) && Post::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
 593                         Logger::notice('Global item already stored.', ['uri' => $item['uri'], 'network' => $item['network']]);
 594                         return true;
 595                 }
 596
 597                 return false;
 598         }
 599
 600         /**
 601          * Check if the item array is valid
 602          *
 603          * @param array $item
 604          * @return boolean item is valid
 605          */
 606         public static function isValid(array $item)
 607         {
 608                 // When there is no content then we don't post it
 609                 if ($item['body'] . $item['title'] == '') {
 610                         Logger::notice('No body, no title.');
 611                         return false;
 612                 }
 613
 614                 if (!empty($item['uid'])) {
 615                         $owner = User::getOwnerDataById($item['uid'], false);
 616                         if (!$owner) {
 617                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 618                                 return false;
 619                         }
 620
 621                         if ($owner['account_expired'] || $owner['account_removed']) {
 622                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 623                                 return false;
 624                         }
 625                 }
 626
 627                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 628                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 629                         return false;
 630                 }
 631
 632                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 633                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 634                         return false;
 635                 }
 636
 637                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 638                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 639                         return false;
 640                 }
 641
 642                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 643                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 644                         return false;
 645                 }
 646
 647                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 648                         return false;
 649                 }
 650
 651                 if ($item['verb'] == Activity::FOLLOW) {
 652                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 653                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 654                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 655                                 return false;
 656                         }
 657
 658                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 659                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 660                         if (Post::exists($condition)) {
 661                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 662                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 663                                 return false;
 664                         }
 665                 }
 666
 667                 return true;
 668         }
 669
 670         /**
 671          * Check if the item array is too old
 672          *
 673          * @param array $item
 674          * @return boolean item is too old
 675          */
 676         public static function isTooOld(array $item)
 677         {
 678                 // check for create date and expire time
 679                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 680
 681                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 682                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 683                         $expire_interval = $user['expire'];
 684                 }
 685
 686                 if (($expire_interval > 0) && !empty($item['created'])) {
 687                         $expire_date = time() - ($expire_interval * 86400);
 688                         $created_date = strtotime($item['created']);
 689                         if ($created_date < $expire_date) {
 690                                 Logger::notice('Item created before expiration interval.', [
 691                                         'created' => date('c', $created_date),
 692                                         'expired' => date('c', $expire_date),
 693                                         '$item' => $item
 694                                 ]);
 695                                 return true;
 696                         }
 697                 }
 698
 699                 return false;
 700         }
 701
 702         /**
 703          * Return the id of the given item array if it has been stored before
 704          *
 705          * @param array $item
 706          * @return integer item id
 707          */
 708         private static function getDuplicateID(array $item)
 709         {
 710                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 711                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 712                                 trim($item['uri']), $item['uid'],
 713                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 714                         $existing = Post::selectFirst(['id', 'network'], $condition);
 715                         if (DBA::isResult($existing)) {
 716                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 717                                 if ($item['uid'] != 0) {
 718                                         Logger::notice('Item already existed for user', [
 719                                                 'uri' => $item['uri'],
 720                                                 'uid' => $item['uid'],
 721                                                 'network' => $item['network'],
 722                                                 'existing_id' => $existing["id"],
 723                                                 'existing_network' => $existing["network"]
 724                                         ]);
 725                                 }
 726
 727                                 return $existing["id"];
 728                         }
 729                 }
 730                 return 0;
 731         }
 732
 733         /**
 734          * Fetch top-level parent data for the given item array
 735          *
 736          * @param array $item
 737          * @return array item array with parent data
 738          * @throws \Exception
 739          */
 740         private static function getTopLevelParent(array $item)
 741         {
 742                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 743                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 744                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 745                 $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid']];
 746                 $params = ['order' => ['id' => false]];
 747                 $parent = Post::selectFirst($fields, $condition, $params);
 748
 749                 if (!DBA::isResult($parent)) {
 750                         Logger::notice('item parent was not found - ignoring item', ['thr-parent' => $item['thr-parent'], 'uid' => $item['uid']]);
 751                         return [];
 752                 }
 753
 754                 if ($parent['uri'] == $parent['parent-uri']) {
 755                         return $parent;
 756                 }
 757
 758                 $condition = ['uri' => $parent['parent-uri'],
 759                         'parent-uri' => $parent['parent-uri'],
 760                         'uid' => $parent['uid']];
 761                 $params = ['order' => ['id' => false]];
 762                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 763                 if (!DBA::isResult($toplevel_parent)) {
 764                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri' => $parent['parent-uri'], 'uid' => $parent['uid']]);
 765                         return [];
 766                 }
 767
 768                 return $toplevel_parent;
 769         }
 770
 771         /**
 772          * Get the gravity for the given item array
 773          *
 774          * @param array $item
 775          * @return integer gravity
 776          */
 777         private static function getGravity(array $item)
 778         {
 779                 $activity = DI::activity();
 780
 781                 if (isset($item['gravity'])) {
 782                         return intval($item['gravity']);
 783                 } elseif ($item['parent-uri'] === $item['uri']) {
 784                         return GRAVITY_PARENT;
 785                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 786                         return GRAVITY_COMMENT;
 787                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 788                         return GRAVITY_ACTIVITY;
 789                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 790                         return GRAVITY_ACTIVITY;
 791                 }
 792                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 793                 return GRAVITY_UNKNOWN;   // Should not happen
 794         }
 795
 796         public static function insert($item, $notify = false, $dontcache = false)
 797         {
 798                 $structure = self::getItemFields();
 799
 800                 $orig_item = $item;
 801
 802                 $priority = PRIORITY_HIGH;
 803
 804                 // If it is a posting where users should get notifications, then define it as wall posting
 805                 if ($notify) {
 806                         $item['wall'] = 1;
 807                         $item['origin'] = 1;
 808                         $item['network'] = Protocol::DFRN;
 809                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 810                         $item['direction'] = Conversation::PUSH;
 811
 812                         if (in_array($notify, PRIORITIES)) {
 813                                 $priority = $notify;
 814                         }
 815                 } else {
 816                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 817                 }
 818
 819                 $uid = intval($item['uid']);
 820
 821                 $item['guid'] = self::guid($item, $notify);
 822                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 823
 824                 // Store URI data
 825                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 826
 827                 // Backward compatibility: parent-uri used to be the direct parent uri.
 828                 // If it is provided without a thr-parent, it probably is the old behavior.
 829                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 830                 $item['parent-uri'] = $item['thr-parent'];
 831
 832                 // Store conversation data
 833                 $item = Conversation::insert($item);
 834
 835                 /*
 836                  * Do we already have this item?
 837                  * We have to check several networks since Friendica posts could be repeated
 838                  * via OStatus (maybe Diasporsa as well)
 839                  */
 840                 $duplicate = self::getDuplicateID($item);
 841                 if ($duplicate) {
 842                         return $duplicate;
 843                 }
 844
 845                 // Additional duplicate checks
 846                 /// @todo Check why the first duplication check returns the item number and the second a 0
 847                 if (self::isDuplicate($item)) {
 848                         return 0;
 849                 }
 850
 851                 $item['wall']          = intval($item['wall'] ?? 0);
 852                 $item['extid']         = trim($item['extid'] ?? '');
 853                 $item['author-name']   = trim($item['author-name'] ?? '');
 854                 $item['author-link']   = trim($item['author-link'] ?? '');
 855                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 856                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 857                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 858                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 859                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 860                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 861                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 862                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 863                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 864                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 865                 $item['location']      = trim($item['location'] ?? '');
 866                 $item['coord']         = trim($item['coord'] ?? '');
 867                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 868                 $item['deleted']       = 0;
 869                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
 870                 $item['verb']          = trim($item['verb'] ?? '');
 871                 $item['object-type']   = trim($item['object-type'] ?? '');
 872                 $item['object']        = trim($item['object'] ?? '');
 873                 $item['target-type']   = trim($item['target-type'] ?? '');
 874                 $item['target']        = trim($item['target'] ?? '');
 875                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 876                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 877                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 878                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 879                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 880                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 881                 $item['body']          = trim($item['body'] ?? '');
 882                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 883                 $item['app']           = trim($item['app'] ?? '');
 884                 $item['origin']        = intval($item['origin'] ?? 0);
 885                 $item['postopts']      = trim($item['postopts'] ?? '');
 886                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 887                 $item['event-id']      = intval($item['event-id'] ?? 0);
 888                 $item['inform']        = trim($item['inform'] ?? '');
 889                 $item['file']          = trim($item['file'] ?? '');
 890
 891                 // Items cannot be stored before they happen ...
 892                 if ($item['created'] > DateTimeFormat::utcNow()) {
 893                         $item['created'] = DateTimeFormat::utcNow();
 894                 }
 895
 896                 // We haven't invented time travel by now.
 897                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 898                         $item['edited'] = DateTimeFormat::utcNow();
 899                 }
 900
 901                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 902
 903                 $item['gravity'] = self::getGravity($item);
 904
 905                 $item['language'] = self::getLanguage($item);
 906
 907                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 908                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 909                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 910
 911                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 912                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 913                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 914
 915                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 916                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 917                         $item['post-type'] = self::PT_FOLLOWER;
 918                 }
 919
 920                 // Ensure that there is an avatar cache
 921                 Contact::checkAvatarCache($item['author-id']);
 922                 Contact::checkAvatarCache($item['owner-id']);
 923
 924                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 925                 $item["contact-id"] = self::contactId($item);
 926
 927                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 928                         self::isTooOld($item)) {
 929                         Logger::info('Item is too old', ['item' => $item]);
 930                         return 0;
 931                 }
 932
 933                 if (!self::isValid($item)) {
 934                         return 0;
 935                 }
 936
 937                 if ($item['gravity'] !== GRAVITY_PARENT) {
 938                         $toplevel_parent = self::getTopLevelParent($item);
 939                         if (empty($toplevel_parent)) {
 940                                 return 0;
 941                         }
 942
 943                         // If the thread originated from this node, we check the permission against the thread starter
 944                         $condition = ['uri' => $toplevel_parent['uri'], 'wall' => true];
 945                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 946                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 947                                 return 0;
 948                         }
 949
 950                         $parent_id          = $toplevel_parent['id'];
 951                         $item['parent-uri'] = $toplevel_parent['uri'];
 952                         $item['deleted']    = $toplevel_parent['deleted'];
 953                         $item['allow_cid']  = $toplevel_parent['allow_cid'];
 954                         $item['allow_gid']  = $toplevel_parent['allow_gid'];
 955                         $item['deny_cid']   = $toplevel_parent['deny_cid'];
 956                         $item['deny_gid']   = $toplevel_parent['deny_gid'];
 957                         $parent_origin      = $toplevel_parent['origin'];
 958
 959                         // Don't federate received participation messages
 960                         if ($item['verb'] != Activity::FOLLOW) {
 961                                 $item['wall'] = $toplevel_parent['wall'];
 962                         } else {
 963                                 $item['wall'] = false;
 964                         }
 965
 966                         /*
 967                          * If the parent is private, force privacy for the entire conversation
 968                          * This differs from the above settings as it subtly allows comments from
 969                          * email correspondents to be private even if the overall thread is not.
 970                          */
 971                         if ($toplevel_parent['private']) {
 972                                 $item['private'] = $toplevel_parent['private'];
 973                         }
 974
 975                         /*
 976                          * Edge case. We host a public forum that was originally posted to privately.
 977                          * The original author commented, but as this is a comment, the permissions
 978                          * weren't fixed up so it will still show the comment as private unless we fix it here.
 979                          */
 980                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
 981                                 $item['private'] = self::PUBLIC;
 982                         }
 983
 984                         // If its a post that originated here then tag the thread as "mention"
 985                         if ($item['origin'] && $item['uid']) {
 986                                 DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
 987                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'uid' => $item['uid']]);
 988                         }
 989
 990                         // Update the contact relations
 991                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 992
 993                         unset($item['parent_origin']);
 994                 } else {
 995                         $parent_id = 0;
 996                         $parent_origin = $item['origin'];
 997                 }
 998
 999                 // We don't store the causer link, only the id
1000                 unset($item['causer-link']);
1001
1002                 // We don't store these fields anymore in the item table
1003                 unset($item['author-link']);
1004                 unset($item['author-name']);
1005                 unset($item['author-avatar']);
1006                 unset($item['author-network']);
1007
1008                 unset($item['owner-link']);
1009                 unset($item['owner-name']);
1010                 unset($item['owner-avatar']);
1011
1012                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
1013                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
1014
1015                 // Is this item available in the global items (with uid=0)?
1016                 if ($item["uid"] == 0) {
1017                         $item["global"] = true;
1018
1019                         // Set the global flag on all items if this was a global item entry
1020                         DBA::update('item', ['global' => true], ['uri' => $item["uri"]]);
1021                 } else {
1022                         $item["global"] = Post::exists(['uid' => 0, 'uri' => $item["uri"]]);
1023                 }
1024
1025                 // ACL settings
1026                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
1027                         $item["private"] = self::PRIVATE;
1028                 }
1029
1030                 if ($notify) {
1031                         $item['edit'] = false;
1032                         $item['parent'] = $parent_id;
1033                         Hook::callAll('post_local', $item);
1034                         unset($item['edit']);
1035                 } else {
1036                         Hook::callAll('post_remote', $item);
1037                 }
1038
1039                 // Set after the insert because top-level posts are self-referencing
1040                 unset($item['parent']);
1041
1042                 if (!empty($item['cancel'])) {
1043                         Logger::log('post cancelled by addon.');
1044                         return 0;
1045                 }
1046
1047                 if (empty($item['vid']) && !empty($item['verb'])) {
1048                         $item['vid'] = Verb::getID($item['verb']);
1049                 }
1050
1051                 // Creates or assigns the permission set
1052                 $item['psid'] = PermissionSet::getIdFromACL(
1053                         $item['uid'],
1054                         $item['allow_cid'],
1055                         $item['allow_gid'],
1056                         $item['deny_cid'],
1057                         $item['deny_gid']
1058                 );
1059
1060                 unset($item['allow_cid']);
1061                 unset($item['allow_gid']);
1062                 unset($item['deny_cid']);
1063                 unset($item['deny_gid']);
1064
1065                 // This array field is used to trigger some automatic reactions
1066                 // It is mainly used in the "post_local" hook.
1067                 unset($item['api_source']);
1068
1069                 if ($item['verb'] == Activity::ANNOUNCE) {
1070                         self::setOwnerforResharedItem($item);
1071                 }
1072
1073                 // Remove all media attachments from the body and store them in the post-media table
1074                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
1075                 $item['raw-body'] = self::setHashtags($item['raw-body']);
1076
1077                 // Check for hashtags in the body and repair or add hashtag links
1078                 $item['body'] = self::setHashtags($item['body']);
1079
1080                 if (!empty($item['attach'])) {
1081                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
1082                 }
1083
1084                 // Fill the cache field
1085                 self::putInCache($item);
1086
1087                 if (stristr($item['verb'], Activity::POKE)) {
1088                         $notify_type = Delivery::POKE;
1089                 } else {
1090                         $notify_type = Delivery::POST;
1091                 }
1092
1093                 if (!in_array($item['verb'], self::ACTIVITIES) && !self::insertContent($item)) {
1094                         // This shouldn't happen
1095                         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']]);
1096                         return 0;
1097                 }
1098
1099                 $body = $item['body'];
1100                 $verb = $item['verb'];
1101
1102                 // We just remove everything that is content
1103                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1104                         unset($item[$field]);
1105                 }
1106
1107                 unset($item['activity']);
1108
1109                 // Filling item related side tables
1110
1111                 // Diaspora signature
1112                 if (!empty($item['diaspora_signed_text'])) {
1113                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
1114                 }
1115
1116                 unset($item['diaspora_signed_text']);
1117
1118                 // Attached file links
1119                 if (!empty($item['file'])) {
1120                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1121                 }
1122
1123                 unset($item['file']);
1124
1125                 // Delivery relevant data
1126                 $delivery_data = Post\DeliveryData::extractFields($item);
1127                 unset($item['postopts']);
1128                 unset($item['inform']);
1129
1130                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1131                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1132                 }
1133
1134                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1135                 if (!Tag::existsForPost($item['uri-id'])) {
1136                         Tag::storeFromBody($item['uri-id'], $body);
1137                 }
1138
1139                 if (Post\User::insert($item['uri-id'], $item['uid'], $item)) {
1140                         // Remove all fields that aren't part of the item table
1141                         foreach ($item as $field => $value) {
1142                                 if (!in_array($field, $structure['item'])) {
1143                                         unset($item[$field]);
1144                                 }
1145                         }
1146
1147                         $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'network' => $item['network']];
1148                         if (DBA::exists('item', $condition)) {
1149                                 Logger::notice('Item is already inserted - aborting', $condition);
1150                                 return 0;
1151                         }
1152
1153                         $result = DBA::insert('item', $item);
1154
1155                         // When the item was successfully stored we fetch the ID of the item.
1156                         $current_post = DBA::lastInsertId();
1157                 } else {
1158                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1159                         return 0;
1160                 }
1161
1162                 if (empty($current_post) || !DBA::isResult($result)) {
1163                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1164                         Logger::warning('Could not store item. it will be spooled', ['result' => $result, 'id' => $current_post]);
1165                         self::spool($orig_item);
1166                         return 0;
1167                 }
1168
1169                 Logger::notice('created item', ['id' => $current_post, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1170
1171                 if (!$parent_id || ($item['gravity'] === GRAVITY_PARENT)) {
1172                         $parent_id = $current_post;
1173                 }
1174
1175                 // Set parent id
1176                 DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1177
1178                 $item['id'] = $current_post;
1179                 $item['parent'] = $parent_id;
1180
1181                 // update the commented timestamp on the parent
1182                 if (DI::config()->get('system', 'like_no_comment')) {
1183                         // Update when it is a comment
1184                         $update_commented = in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1185                 } else {
1186                         // Update when it isn't a follow or tag verb
1187                         $update_commented = !in_array($verb, [Activity::FOLLOW, Activity::TAG]);
1188                 }
1189
1190                 if ($update_commented) {
1191                         DBA::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1192                 } else {
1193                         DBA::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1194                 }
1195
1196                 if ($item['gravity'] === GRAVITY_PARENT) {
1197                         self::addThread($current_post);
1198                 } else {
1199                         self::updateThread($parent_id);
1200                 }
1201
1202                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1203                 if (self::tagDeliver($item['uid'], $current_post)) {
1204                         // Get the user information for the logging
1205                         $user = User::getById($uid);
1206
1207                         Logger::notice('Item had been deleted', ['id' => $current_post, 'user' => $uid, 'account-type' => $user['account-type']]);
1208                         return 0;
1209                 }
1210
1211                 if (!$dontcache) {
1212                         $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1213                         if (DBA::isResult($posted_item)) {
1214                                 if ($notify) {
1215                                         Hook::callAll('post_local_end', $posted_item);
1216                                 } else {
1217                                         Hook::callAll('post_remote_end', $posted_item);
1218                                 }
1219                         } else {
1220                                 Logger::log('new item not found in DB, id ' . $current_post);
1221                         }
1222                 }
1223
1224                 if ($item['gravity'] === GRAVITY_PARENT) {
1225                         self::addShadow($current_post);
1226                 } else {
1227                         self::addShadowPost($current_post);
1228                 }
1229
1230                 self::updateContact($item);
1231
1232                 UserItem::setNotification($current_post);
1233
1234                 check_user_notification($current_post);
1235
1236                 // Distribute items to users who subscribed to their tags
1237                 self::distributeByTags($item);
1238
1239                 // Automatically reshare the item if the "remote_self" option is selected
1240                 self::autoReshare($item);
1241
1242                 $transmit = $notify || ($item['visible'] && ($parent_origin || $item['origin']));
1243
1244                 if ($transmit) {
1245                         $transmit_item = Post::selectFirst(['verb', 'origin'], ['id' => $item['id']]);
1246                         // Don't relay participation messages
1247                         if (($transmit_item['verb'] == Activity::FOLLOW) &&
1248                                 (!$transmit_item['origin'] || ($item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1249                                 Logger::info('Participation messages will not be relayed', ['item' => $item['id'], 'uri' => $item['uri'], 'verb' => $transmit_item['verb']]);
1250                                 $transmit = false;
1251                         }
1252                 }
1253
1254                 if ($transmit) {
1255                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
1256                 }
1257
1258                 return $current_post;
1259         }
1260
1261         /**
1262          * Change the owner of a parent item if it had been shared by a forum
1263          *
1264          * (public) forum posts in the new format consist of the regular post by the author
1265          * followed by an announce message sent from the forum account.
1266          * Changing the owner helps in grouping forum posts.
1267          *
1268          * @param array $item
1269          * @return void
1270          */
1271         private static function setOwnerforResharedItem(array $item)
1272         {
1273                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-type'],
1274                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1275                 if (!DBA::isResult($parent)) {
1276                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1277                         return;
1278                 }
1279
1280                 $author = Contact::selectFirst(['url', 'contact-type'], ['id' => $item['author-id']]);
1281                 if (!DBA::isResult($author)) {
1282                         Logger::error('Author not found', ['id' => $item['author-id']]);
1283                         return;
1284                 }
1285
1286                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1287                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1288                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid']]);
1289                         return;
1290                 }
1291
1292                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1293                         if ($parent['post-type'] == self::PT_ANNOUNCEMENT) {
1294                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1295                                 return;
1296                         }
1297
1298                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1299                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1300                                 return;
1301                         }
1302                         self::update(['post-type' => self::PT_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1303                         Logger::info('Set announcement post-type', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1304                         return;
1305                 }
1306
1307                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1308                 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]);
1309         }
1310
1311         /**
1312          * Distribute the given item to users who subscribed to their tags
1313          *
1314          * @param array $item     Processed item
1315          */
1316         private static function distributeByTags(array $item)
1317         {
1318                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1319                         return;
1320                 }
1321
1322                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1323                 foreach ($uids as $uid) {
1324                         if (Contact::isSharing($item['author-id'], $uid)) {
1325                                 $fields = [];
1326                         } else {
1327                                 $fields = ['post-type' => self::PT_TAG];
1328                         }
1329
1330                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1331                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1332                 }
1333         }
1334
1335         /**
1336          * Insert a new item content entry
1337          *
1338          * @param array $item The item fields that are to be inserted
1339          * @return bool "true" if content was inserted or already existed
1340          * @throws \Exception
1341          */
1342         private static function insertContent(array $item)
1343         {
1344                 $fields = ['uri-plink-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
1345
1346                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1347                         if (isset($item[$field])) {
1348                                 $fields[$field] = $item[$field];
1349                         }
1350                 }
1351
1352                 $found = DBA::exists('item-content', ['uri-id' => $item['uri-id']]);
1353                 if ($found) {
1354                         Logger::info('Existing content found', ['uri-id' => $item['uri-id'], 'uri' => $item['uri']]);
1355                         return true;
1356                 }
1357
1358                 DBA::insert('item-content', $fields, Database::INSERT_IGNORE);
1359
1360                 $found = DBA::exists('item-content', ['uri-id' => $item['uri-id']]);
1361                 if ($found) {
1362                         Logger::notice('Content inserted', ['uri-id' => $item['uri-id'], 'uri' => $item['uri']]);
1363                         return true;
1364                 }
1365
1366                 // This shouldn't happen.
1367                 Logger::error("Content wasn't inserted", $item);
1368                 return false;
1369         }
1370
1371         /**
1372          * Update existing item content entries
1373          *
1374          * @param array $item      The item fields that are to be changed
1375          * @param array $condition The condition for finding the item content entries
1376          * @throws \Exception
1377          */
1378         private static function updateContent($item, $condition)
1379         {
1380                 // We have to select only the fields from the "item-content" table
1381                 $fields = [];
1382                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1383                         if (isset($item[$field])) {
1384                                 $fields[$field] = $item[$field];
1385                         }
1386                 }
1387
1388                 if (empty($fields)) {
1389                         return;
1390                 }
1391
1392                 DBA::update('item-content', $fields, $condition, true);
1393                 Logger::info('Updated content', ['condition' => $condition]);
1394         }
1395
1396         /**
1397          * Distributes public items to the receivers
1398          *
1399          * @param integer $itemid      Item ID that should be added
1400          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1401          * @throws \Exception
1402          */
1403         public static function distribute($itemid, $signed_text = '')
1404         {
1405                 $condition = ["`id` IN (SELECT `parent` FROM `post-view` WHERE `id` = ?)", $itemid];
1406                 $parent = Post::selectFirst(['owner-id'], $condition);
1407                 if (!DBA::isResult($parent)) {
1408                         return;
1409                 }
1410
1411                 // Only distribute public items from native networks
1412                 $condition = ['id' => $itemid, 'uid' => 0,
1413                         'network' => array_merge(Protocol::FEDERATED ,['']),
1414                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1415                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1416                 if (!DBA::isResult($item)) {
1417                         return;
1418                 }
1419
1420                 $origin = $item['origin'];
1421
1422                 $users = [];
1423
1424                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1425                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1426                 if (!DBA::isResult($owner)) {
1427                         return;
1428                 }
1429
1430                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1431                 $contacts = DBA::select('contact', ['uid'], $condition);
1432                 while ($contact = DBA::fetch($contacts)) {
1433                         if ($contact['uid'] == 0) {
1434                                 continue;
1435                         }
1436
1437                         $users[$contact['uid']] = $contact['uid'];
1438                 }
1439                 DBA::close($contacts);
1440
1441                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1442                 $contacts = DBA::select('contact', ['uid'], $condition);
1443                 while ($contact = DBA::fetch($contacts)) {
1444                         if ($contact['uid'] == 0) {
1445                                 continue;
1446                         }
1447
1448                         $users[$contact['uid']] = $contact['uid'];
1449                 }
1450                 DBA::close($contacts);
1451
1452                 if (!empty($owner['alias'])) {
1453                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1454                         $contacts = DBA::select('contact', ['uid'], $condition);
1455                         while ($contact = DBA::fetch($contacts)) {
1456                                 if ($contact['uid'] == 0) {
1457                                         continue;
1458                                 }
1459
1460                                 $users[$contact['uid']] = $contact['uid'];
1461                         }
1462                         DBA::close($contacts);
1463                 }
1464
1465                 $origin_uid = 0;
1466
1467                 if ($item['uri'] != $item['parent-uri']) {
1468                         $parents = Post::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
1469                         while ($parent = Post::fetch($parents)) {
1470                                 $users[$parent['uid']] = $parent['uid'];
1471                                 if ($parent['origin'] && !$origin) {
1472                                         $origin_uid = $parent['uid'];
1473                                 }
1474                         }
1475                         DBA::close($parents);
1476                 }
1477
1478                 foreach ($users as $uid) {
1479                         if ($origin_uid == $uid) {
1480                                 $item['diaspora_signed_text'] = $signed_text;
1481                         }
1482                         self::storeForUser($item, $uid);
1483                 }
1484         }
1485
1486         /**
1487          * Store a public item defined by their URI-ID for the given users
1488          *
1489          * @param integer $uri_id URI-ID of the given item
1490          * @param integer $uid    The user that will receive the item entry
1491          * @param array   $fields Additional fields to be stored
1492          * @return integer stored item id
1493          */
1494         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1495         {
1496                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1497                 if (!DBA::isResult($item)) {
1498                         return 0;
1499                 }
1500
1501                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1502                         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']]);
1503                         return 0;
1504                 }
1505
1506                 $item['post-type'] = self::PT_STORED;
1507
1508                 $item = array_merge($item, $fields);
1509
1510                 $stored = self::storeForUser($item, $uid);
1511                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1512                 return $stored;
1513         }
1514
1515         /**
1516          * Store a public item array for the given users
1517          *
1518          * @param array   $item   The item entry that will be stored
1519          * @param integer $uid    The user that will receive the item entry
1520          * @return integer stored item id
1521          * @throws \Exception
1522          */
1523         private static function storeForUser(array $item, int $uid)
1524         {
1525                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1526                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1527                         return 0;
1528                 }
1529
1530                 unset($item['id']);
1531                 unset($item['parent']);
1532                 unset($item['mention']);
1533                 unset($item['starred']);
1534                 unset($item['unseen']);
1535                 unset($item['psid']);
1536
1537                 $item['uid'] = $uid;
1538                 $item['origin'] = 0;
1539                 $item['wall'] = 0;
1540
1541                 if ($item['gravity'] == GRAVITY_PARENT) {
1542                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1543                 } else {
1544                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1545                 }
1546
1547                 if (!empty($contact['id'])) {
1548                         $item['contact-id'] = $contact['id'];
1549                 } else {
1550                         // Shouldn't happen at all
1551                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1552                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1553                         if (!DBA::isResult($self)) {
1554                                 // Shouldn't happen even less
1555                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1556                                 return 0;
1557                         }
1558                         $item['contact-id'] = $self['id'];
1559                 }
1560
1561                 /// @todo Handling of "event-id"
1562
1563                 $notify = false;
1564                 if ($item['gravity'] == GRAVITY_PARENT) {
1565                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1566                         if (DBA::isResult($contact)) {
1567                                 $notify = self::isRemoteSelf($contact, $item);
1568                         }
1569                 }
1570
1571                 $distributed = self::insert($item, $notify, true);
1572
1573                 if (!$distributed) {
1574                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1575                 } else {
1576                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1577                 }
1578                 return $distributed;
1579         }
1580
1581         /**
1582          * Add a shadow entry for a given item id that is a thread starter
1583          *
1584          * We store every public item entry additionally with the user id "0".
1585          * This is used for the community page and for the search.
1586          * It is planned that in the future we will store public item entries only once.
1587          *
1588          * @param integer $itemid Item ID that should be added
1589          * @throws \Exception
1590          */
1591         private static function addShadow($itemid)
1592         {
1593                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri'];
1594                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1595                 $item = Post::selectFirst($fields, $condition);
1596
1597                 if (!DBA::isResult($item)) {
1598                         return;
1599                 }
1600
1601                 // is it already a copy?
1602                 if (($itemid == 0) || ($item['uid'] == 0)) {
1603                         return;
1604                 }
1605
1606                 // Is it a visible public post?
1607                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || ($item["private"] == self::PRIVATE)) {
1608                         return;
1609                 }
1610
1611                 // is it an entry from a connector? Only add an entry for natively connected networks
1612                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1613                         return;
1614                 }
1615
1616                 if (Post::exists(['uri' => $item['uri'], 'uid' => 0])) {
1617                         return;
1618                 }
1619
1620                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1621
1622                 if (DBA::isResult($item)) {
1623                         // Preparing public shadow (removing user specific data)
1624                         $item['uid'] = 0;
1625                         unset($item['id']);
1626                         unset($item['parent']);
1627                         unset($item['wall']);
1628                         unset($item['mention']);
1629                         unset($item['origin']);
1630                         unset($item['starred']);
1631                         unset($item['postopts']);
1632                         unset($item['inform']);
1633                         unset($item['post-type']);
1634                         if ($item['uri'] == $item['parent-uri']) {
1635                                 $item['contact-id'] = $item['owner-id'];
1636                         } else {
1637                                 $item['contact-id'] = $item['author-id'];
1638                         }
1639
1640                         $public_shadow = self::insert($item, false, true);
1641
1642                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1643                 }
1644         }
1645
1646         /**
1647          * Add a shadow entry for a given item id that is a comment
1648          *
1649          * This function does the same like the function above - but for comments
1650          *
1651          * @param integer $itemid Item ID that should be added
1652          * @throws \Exception
1653          */
1654         private static function addShadowPost($itemid)
1655         {
1656                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1657                 if (!DBA::isResult($item)) {
1658                         return;
1659                 }
1660
1661                 // Is it a toplevel post?
1662                 if ($item['gravity'] == GRAVITY_PARENT) {
1663                         self::addShadow($itemid);
1664                         return;
1665                 }
1666
1667                 // Is this a shadow entry?
1668                 if ($item['uid'] == 0) {
1669                         return;
1670                 }
1671
1672                 // Is there a shadow parent?
1673                 if (!Post::exists(['uri' => $item['parent-uri'], 'uid' => 0])) {
1674                         return;
1675                 }
1676
1677                 // Is there already a shadow entry?
1678                 if (Post::exists(['uri' => $item['uri'], 'uid' => 0])) {
1679                         return;
1680                 }
1681
1682                 // Save "origin" and "parent" state
1683                 $origin = $item['origin'];
1684                 $parent = $item['parent'];
1685
1686                 // Preparing public shadow (removing user specific data)
1687                 $item['uid'] = 0;
1688                 unset($item['id']);
1689                 unset($item['parent']);
1690                 unset($item['wall']);
1691                 unset($item['mention']);
1692                 unset($item['origin']);
1693                 unset($item['starred']);
1694                 unset($item['postopts']);
1695                 unset($item['inform']);
1696                 unset($item['post-type']);
1697                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1698
1699                 $public_shadow = self::insert($item, false, true);
1700
1701                 Logger::info('Stored public shadow', ['uri' => $item['uri'], 'id' => $public_shadow]);
1702
1703                 // If this was a comment to a Diaspora post we don't get our comment back.
1704                 // This means that we have to distribute the comment by ourselves.
1705                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1706                         self::distribute($public_shadow);
1707                 }
1708         }
1709
1710         /**
1711          * Adds a language specification in a "language" element of given $arr.
1712          * Expects "body" element to exist in $arr.
1713          *
1714          * @param array $item
1715          * @return string detected language
1716          * @throws \Text_LanguageDetect_Exception
1717          */
1718         private static function getLanguage(array $item)
1719         {
1720                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1721                         return '';
1722                 }
1723
1724                 // Convert attachments to links
1725                 $naked_body = BBCode::removeAttachment($item['body']);
1726                 if (empty($naked_body)) {
1727                         return '';
1728                 }
1729
1730                 // Remove links and pictures
1731                 $naked_body = BBCode::removeLinks($naked_body);
1732
1733                 // Convert the title and the body to plain text
1734                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1735
1736                 // Remove possibly remaining links
1737                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1738
1739                 if (empty($naked_body)) {
1740                         return '';
1741                 }
1742
1743                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1744                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1745                 if (is_array($languages)) {
1746                         return json_encode($languages);
1747                 }
1748
1749                 return '';
1750         }
1751
1752         public static function getLanguageMessage(array $item)
1753         {
1754                 $iso639 = new \Matriphe\ISO639\ISO639;
1755
1756                 $used_languages = '';
1757                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1758                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1759                 }
1760                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1761                 return $used_languages;
1762         }
1763
1764         /**
1765          * Creates an unique guid out of a given uri
1766          *
1767          * @param string $uri uri of an item entry
1768          * @param string $host hostname for the GUID prefix
1769          * @return string unique guid
1770          */
1771         public static function guidFromUri($uri, $host)
1772         {
1773                 // Our regular guid routine is using this kind of prefix as well
1774                 // We have to avoid that different routines could accidentally create the same value
1775                 $parsed = parse_url($uri);
1776
1777                 // We use a hash of the hostname as prefix for the guid
1778                 $guid_prefix = hash("crc32", $host);
1779
1780                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1781                 unset($parsed["scheme"]);
1782
1783                 // Glue it together to be able to make a hash from it
1784                 $host_id = implode("/", $parsed);
1785
1786                 // We could use any hash algorithm since it isn't a security issue
1787                 $host_hash = hash("ripemd128", $host_id);
1788
1789                 return $guid_prefix.$host_hash;
1790         }
1791
1792         /**
1793          * generate an unique URI
1794          *
1795          * @param integer $uid  User id
1796          * @param string  $guid An existing GUID (Otherwise it will be generated)
1797          *
1798          * @return string
1799          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1800          */
1801         public static function newURI($uid, $guid = "")
1802         {
1803                 if ($guid == "") {
1804                         $guid = System::createUUID();
1805                 }
1806
1807                 return DI::baseUrl()->get() . '/objects/' . $guid;
1808         }
1809
1810         /**
1811          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1812          *
1813          * This can be used to filter for inactive contacts.
1814          * Only do this for public postings to avoid privacy problems, since poco data is public.
1815          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1816          *
1817          * @param array $arr Contains the just posted item record
1818          * @throws \Exception
1819          */
1820         private static function updateContact($arr)
1821         {
1822                 // Unarchive the author
1823                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1824                 if (DBA::isResult($contact)) {
1825                         Contact::unmarkForArchival($contact);
1826                 }
1827
1828                 // Unarchive the contact if it's not our own contact
1829                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1830                 if (DBA::isResult($contact)) {
1831                         Contact::unmarkForArchival($contact);
1832                 }
1833
1834                 /// @todo On private posts we could obfuscate the date
1835                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1836
1837                 // Is it a forum? Then we don't care about the rules from above
1838                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri"] === $arr["uri"])) {
1839                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1840                                 $update = true;
1841                         }
1842                 }
1843
1844                 if ($update) {
1845                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1846                         // So we have to ensure to only update the last item when it had been our own post,
1847                         // or it had been done by a "regular" contact.
1848                         if (!empty($arr['wall'])) {
1849                                 $condition = ['id' => $arr['contact-id']];
1850                         } else {
1851                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1852                         }
1853                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1854                 }
1855                 // Now do the same for the system wide contacts with uid=0
1856                 if ($arr['private'] != self::PRIVATE) {
1857                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1858                                 ['id' => $arr['owner-id']]);
1859
1860                         if ($arr['owner-id'] != $arr['author-id']) {
1861                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1862                                         ['id' => $arr['author-id']]);
1863                         }
1864                 }
1865         }
1866
1867         public static function setHashtags($body)
1868         {
1869                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1870                         $tags = BBCode::getTags($body);
1871
1872                         // No hashtags?
1873                         if (!count($tags)) {
1874                                 return $body;
1875                         }
1876
1877                         // This sorting is important when there are hashtags that are part of other hashtags
1878                         // Otherwise there could be problems with hashtags like #test and #test2
1879                         // Because of this we are sorting from the longest to the shortest tag.
1880                         usort($tags, function ($a, $b) {
1881                                 return strlen($b) <=> strlen($a);
1882                         });
1883
1884                         $URLSearchString = "^\[\]";
1885
1886                         // All hashtags should point to the home server if "local_tags" is activated
1887                         if (DI::config()->get('system', 'local_tags')) {
1888                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1889                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1890                         }
1891
1892                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1893                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1894                                 function ($match) {
1895                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1896                                 }, $body);
1897
1898                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1899                                 function ($match) {
1900                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1901                                 }, $body);
1902
1903                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1904                                 function ($match) {
1905                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1906                                 }, $body);
1907
1908                         // Repair recursive urls
1909                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1910                                 "&num;$2", $body);
1911
1912                         foreach ($tags as $tag) {
1913                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1914                                         continue;
1915                                 }
1916
1917                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1918                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1919
1920                                 $body = str_replace($tag, $newtag, $body);
1921                         }
1922
1923                         // Convert back the masked hashtags
1924                         $body = str_replace("&num;", "#", $body);
1925
1926                         return $body;
1927                 });
1928
1929                 return $body;
1930         }
1931
1932         /**
1933          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1934          *
1935          * @param int $uid
1936          * @param int $item_id
1937          * @return boolean true if item was deleted, else false
1938          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1939          * @throws \ImagickException
1940          */
1941         private static function tagDeliver($uid, $item_id)
1942         {
1943                 $mention = false;
1944
1945                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1946                 if (!DBA::isResult($user)) {
1947                         return false;
1948                 }
1949
1950                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1951                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1952
1953                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1954                 if (!DBA::isResult($item)) {
1955                         return false;
1956                 }
1957
1958                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1959
1960                 /*
1961                  * Diaspora uses their own hardwired link URL in @-tags
1962                  * instead of the one we supply with webfinger
1963                  */
1964                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
1965
1966                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1967                 if ($cnt) {
1968                         foreach ($matches as $mtch) {
1969                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
1970                                         $mention = true;
1971                                         Logger::log('mention found: ' . $mtch[2]);
1972                                 }
1973                         }
1974                 }
1975
1976                 if (!$mention) {
1977                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1978                         foreach ($tags as $tag) {
1979                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
1980                                         $mention = true;
1981                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
1982                                 }
1983                         }
1984                 }
1985
1986                 if (!$mention) {
1987                         if (($community_page || $prvgroup) &&
1988                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
1989                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item_id, 'guid'=> $item['guid']]);
1990                                 DBA::delete('item', ['id' => $item_id]);
1991                                 return true;
1992                         }
1993                         return false;
1994                 }
1995
1996                 $arr = ['item' => $item, 'user' => $user];
1997
1998                 Hook::callAll('tagged', $arr);
1999
2000                 if (!$community_page && !$prvgroup) {
2001                         return false;
2002                 }
2003
2004                 /*
2005                  * tgroup delivery - setup a second delivery chain
2006                  * prevent delivery looping - only proceed
2007                  * if the message originated elsewhere and is a top-level post
2008                  */
2009                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2010                         return false;
2011                 }
2012
2013                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2014                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2015                 if (!DBA::isResult($self)) {
2016                         return false;
2017                 }
2018
2019                 $owner_id = Contact::getIdForURL($self['url']);
2020
2021                 // also reset all the privacy bits to the forum default permissions
2022
2023                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
2024
2025                 $psid = PermissionSet::getIdFromACL(
2026                         $user['uid'],
2027                         $user['allow_cid'],
2028                         $user['allow_gid'],
2029                         $user['deny_cid'],
2030                         $user['deny_gid']
2031                 );
2032
2033                 $forum_mode = ($prvgroup ? 2 : 1);
2034
2035                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2036                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2037                 self::update($fields, ['id' => $item_id]);
2038
2039                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, $item_id);
2040
2041                 self::performActivity($item_id, 'announce', $uid);
2042
2043                 return false;
2044         }
2045
2046         /**
2047          * Automatically reshare the item if the "remote_self" option is selected
2048          *
2049          * @param array $item
2050          * @return void
2051          */
2052         private static function autoReshare(array $item)
2053         {
2054                 if ($item['gravity'] != GRAVITY_PARENT) {
2055                         return;
2056                 }
2057
2058                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
2059                         return;
2060                 }
2061
2062                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
2063                         return;
2064                 }
2065
2066                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
2067
2068                 self::performActivity($item['id'], 'announce', $item['uid']);
2069         }
2070
2071         public static function isRemoteSelf($contact, &$datarray)
2072         {
2073                 if (!$contact['remote_self']) {
2074                         return false;
2075                 }
2076
2077                 // Prevent the forwarding of posts that are forwarded
2078                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2079                         Logger::info('Already forwarded');
2080                         return false;
2081                 }
2082
2083                 // Prevent to forward already forwarded posts
2084                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
2085                         Logger::info('Already forwarded (second test)');
2086                         return false;
2087                 }
2088
2089                 // Only forward posts
2090                 if ($datarray["verb"] != Activity::POST) {
2091                         Logger::info('No post');
2092                         return false;
2093                 }
2094
2095                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
2096                         Logger::info('Not public');
2097                         return false;
2098                 }
2099
2100                 $datarray2 = $datarray;
2101                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
2102                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
2103                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2104                                         ['uid' => $contact['uid'], 'self' => true]);
2105                         if (DBA::isResult($self)) {
2106                                 $datarray['contact-id'] = $self["id"];
2107
2108                                 $datarray['owner-name'] = $self["name"];
2109                                 $datarray['owner-link'] = $self["url"];
2110                                 $datarray['owner-avatar'] = $self["thumb"];
2111
2112                                 $datarray['author-name']   = $datarray['owner-name'];
2113                                 $datarray['author-link']   = $datarray['owner-link'];
2114                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2115
2116                                 unset($datarray['edited']);
2117
2118                                 unset($datarray['network']);
2119                                 unset($datarray['owner-id']);
2120                                 unset($datarray['author-id']);
2121                         }
2122
2123                         if ($contact['network'] != Protocol::FEED) {
2124                                 $old_uri_id = $datarray["uri-id"] ?? 0;
2125                                 $datarray["guid"] = System::createUUID();
2126                                 unset($datarray["plink"]);
2127                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2128                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
2129                                 $datarray["extid"] = Protocol::DFRN;
2130                                 $urlpart = parse_url($datarray2['author-link']);
2131                                 $datarray["app"] = $urlpart["host"];
2132                                 if (!empty($old_uri_id)) {
2133                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
2134                                 }
2135
2136                                 unset($datarray["parent-uri"]);
2137                                 unset($datarray["thr-parent"]);
2138                         } else {
2139                                 $datarray['private'] = self::PUBLIC;
2140                         }
2141                 }
2142
2143                 if ($contact['network'] != Protocol::FEED) {
2144                         // Store the original post
2145                         $result = self::insert($datarray2);
2146                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
2147                 } else {
2148                         $datarray["app"] = "Feed";
2149                         $result = true;
2150                 }
2151
2152                 // Trigger automatic reactions for addons
2153                 $datarray['api_source'] = true;
2154
2155                 // We have to tell the hooks who we are - this really should be improved
2156                 $_SESSION['authenticated'] = true;
2157                 $_SESSION['uid'] = $contact['uid'];
2158
2159                 return (bool)$result;
2160         }
2161
2162         /**
2163          *
2164          * @param string $s
2165          * @param int    $uid
2166          * @param array  $item
2167          * @param int    $cid
2168          * @return string
2169          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2170          * @throws \ImagickException
2171          */
2172         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2173         {
2174                 if (DI::config()->get('system', 'disable_embedded')) {
2175                         return $s;
2176                 }
2177
2178                 Logger::info('check for photos');
2179                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
2180
2181                 $orig_body = $s;
2182                 $new_body = '';
2183
2184                 $img_start = strpos($orig_body, '[img');
2185                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2186                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2187
2188                 while (($img_st_close !== false) && ($img_len !== false)) {
2189                         $img_st_close++; // make it point to AFTER the closing bracket
2190                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2191
2192                         Logger::info('found photo', ['image' => $image]);
2193
2194                         if (stristr($image, $site . '/photo/')) {
2195                                 // Only embed locally hosted photos
2196                                 $replace = false;
2197                                 $i = basename($image);
2198                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2199                                 $x = strpos($i, '-');
2200
2201                                 if ($x) {
2202                                         $res = substr($i, $x + 1);
2203                                         $i = substr($i, 0, $x);
2204                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2205                                         if (DBA::isResult($photo)) {
2206                                                 /*
2207                                                  * Check to see if we should replace this photo link with an embedded image
2208                                                  * 1. No need to do so if the photo is public
2209                                                  * 2. If there's a contact-id provided, see if they're in the access list
2210                                                  *    for the photo. If so, embed it.
2211                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2212                                                  *    permissions, regardless of order but first check to see if they're an exact
2213                                                  *    match to save some processing overhead.
2214                                                  */
2215                                                 if (self::hasPermissions($photo)) {
2216                                                         if ($cid) {
2217                                                                 $recips = self::enumeratePermissions($photo);
2218                                                                 if (in_array($cid, $recips)) {
2219                                                                         $replace = true;
2220                                                                 }
2221                                                         } elseif ($item) {
2222                                                                 if (self::samePermissions($uid, $item, $photo)) {
2223                                                                         $replace = true;
2224                                                                 }
2225                                                         }
2226                                                 }
2227                                                 if ($replace) {
2228                                                         $photo_img = Photo::getImageForPhoto($photo);
2229                                                         // If a custom width and height were specified, apply before embedding
2230                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2231                                                                 Logger::info('scaling photo');
2232
2233                                                                 $width = intval($match[1]);
2234                                                                 $height = intval($match[2]);
2235
2236                                                                 $photo_img->scaleDown(max($width, $height));
2237                                                         }
2238
2239                                                         $data = $photo_img->asString();
2240                                                         $type = $photo_img->getType();
2241
2242                                                         Logger::info('replacing photo');
2243                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2244                                                         Logger::debug('replaced', ['image' => $image]);
2245                                                 }
2246                                         }
2247                                 }
2248                         }
2249
2250                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2251                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2252                         if ($orig_body === false) {
2253                                 $orig_body = '';
2254                         }
2255
2256                         $img_start = strpos($orig_body, '[img');
2257                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2258                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2259                 }
2260
2261                 $new_body = $new_body . $orig_body;
2262
2263                 return $new_body;
2264         }
2265
2266         private static function hasPermissions($obj)
2267         {
2268                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2269                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2270         }
2271
2272         private static function samePermissions($uid, $obj1, $obj2)
2273         {
2274                 // first part is easy. Check that these are exactly the same.
2275                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2276                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2277                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2278                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2279                         return true;
2280                 }
2281
2282                 // This is harder. Parse all the permissions and compare the resulting set.
2283                 $recipients1 = self::enumeratePermissions($obj1);
2284                 $recipients2 = self::enumeratePermissions($obj2);
2285                 sort($recipients1);
2286                 sort($recipients2);
2287
2288                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2289                 return ($recipients1 == $recipients2);
2290         }
2291
2292         /**
2293          * Returns an array of contact-ids that are allowed to see this object
2294          *
2295          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2296          * @param bool  $check_dead Prunes unavailable contacts from the result
2297          * @return array
2298          * @throws \Exception
2299          */
2300         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2301         {
2302                 $aclFormater = DI::aclFormatter();
2303
2304                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2305                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2306                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2307                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2308                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2309                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2310                 $recipients   = array_diff($recipients, $deny);
2311                 return $recipients;
2312         }
2313
2314         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2315         {
2316                 if (!$uid || ($days < 1)) {
2317                         return;
2318                 }
2319
2320                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2321                         $uid, GRAVITY_PARENT];
2322
2323                 /*
2324                  * $expire_network_only = save your own wall posts
2325                  * and just expire conversations started by others
2326                  */
2327                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2328
2329                 if ($expire_network_only) {
2330                         $condition[0] .= " AND NOT `wall`";
2331                 }
2332
2333                 if ($network != "") {
2334                         $condition[0] .= " AND `network` = ?";
2335                         $condition[] = $network;
2336                 }
2337
2338                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2339                 $condition[] = $days;
2340
2341                 $items = Post::select(['resource-id', 'starred', 'type', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2342
2343                 if (!DBA::isResult($items)) {
2344                         return;
2345                 }
2346
2347                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2348
2349                 // Forcing expiring of items - but not notes and marked items
2350                 if ($force) {
2351                         $expire_items = true;
2352                 }
2353
2354                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2355                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2356                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2357
2358                 $expired = 0;
2359
2360                 $priority = DI::config()->get('system', 'expire-notify-priority');
2361
2362                 while ($item = Post::fetch($items)) {
2363                         // don't expire filed items
2364                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2365                                 continue;
2366                         }
2367
2368                         // Only expire posts, not photos and photo comments
2369
2370                         if (!$expire_photos && strlen($item['resource-id'])) {
2371                                 continue;
2372                         } elseif (!$expire_starred && intval($item['starred'])) {
2373                                 continue;
2374                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == self::PT_PERSONAL_NOTE))) {
2375                                 continue;
2376                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2377                                 continue;
2378                         }
2379
2380                         self::markForDeletionById($item['id'], $priority);
2381
2382                         ++$expired;
2383                 }
2384                 DBA::close($items);
2385                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2386         }
2387
2388         public static function firstPostDate($uid, $wall = false)
2389         {
2390                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2391                 $params = ['order' => ['received' => false]];
2392                 $thread = DBA::selectFirst('thread', ['received'], $condition, $params);
2393                 if (DBA::isResult($thread)) {
2394                         return substr(DateTimeFormat::local($thread['received']), 0, 10);
2395                 }
2396                 return false;
2397         }
2398
2399         /**
2400          * add/remove activity to an item
2401          *
2402          * Toggle activities as like,dislike,attend of an item
2403          *
2404          * @param int $item_id
2405          * @param string $verb
2406          *            Activity verb. One of
2407          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2408          *            attendno, unattendno, attendmaybe, unattendmaybe,
2409          *            announce, unannouce
2410          * @return bool
2411          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2412          * @throws \ImagickException
2413          * @hook  'post_local_end'
2414          *            array $arr
2415          *            'post_id' => ID of posted item
2416          */
2417         public static function performActivity(int $item_id, string $verb, int $uid)
2418         {
2419                 if (empty($uid)) {
2420                         return false;
2421                 }
2422
2423                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2424
2425                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2426                 if (!DBA::isResult($item)) {
2427                         Logger::log('like: unknown item ' . $item_id);
2428                         return false;
2429                 }
2430
2431                 $item_uri = $item['uri'];
2432
2433                 if (!in_array($item['uid'], [0, $uid])) {
2434                         return false;
2435                 }
2436
2437                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2438                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2439                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2440                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2441                                 if (!DBA::isResult($item)) {
2442                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'item-uri' => $item_uri]);
2443                                         return false;
2444                                 }
2445                         }
2446                 }
2447
2448                 // Retrieves the local post owner
2449                 $owner = User::getOwnerDataById($uid);
2450                 if (empty($owner)) {
2451                         Logger::info('Empty owner for user', ['uid' => $uid]);
2452                         return false;
2453                 }
2454
2455                 // Retrieve the current logged in user's public contact
2456                 $author_id = Contact::getIdForURL($owner['url']);
2457                 if (empty($author_id)) {
2458                         Logger::info('Empty public contact');
2459                         return false;
2460                 }
2461
2462                 $activity = null;
2463                 switch ($verb) {
2464                         case 'like':
2465                         case 'unlike':
2466                                 $activity = Activity::LIKE;
2467                                 break;
2468                         case 'dislike':
2469                         case 'undislike':
2470                                 $activity = Activity::DISLIKE;
2471                                 break;
2472                         case 'attendyes':
2473                         case 'unattendyes':
2474                                 $activity = Activity::ATTEND;
2475                                 break;
2476                         case 'attendno':
2477                         case 'unattendno':
2478                                 $activity = Activity::ATTENDNO;
2479                                 break;
2480                         case 'attendmaybe':
2481                         case 'unattendmaybe':
2482                                 $activity = Activity::ATTENDMAYBE;
2483                                 break;
2484                         case 'follow':
2485                         case 'unfollow':
2486                                 $activity = Activity::FOLLOW;
2487                                 break;
2488                         case 'announce':
2489                         case 'unannounce':
2490                                 $activity = Activity::ANNOUNCE;
2491                                 break;
2492                         default:
2493                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2494                                 return false;
2495                 }
2496
2497                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2498
2499                 // Enable activity toggling instead of on/off
2500                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2501
2502                 // Look for an existing verb row
2503                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2504                 if ($event_verb_flag) {
2505                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2506
2507                         // Translate to the index based activity index
2508                         $vids = [];
2509                         foreach ($verbs as $verb) {
2510                                 $vids[] = Verb::getID($verb);
2511                         }
2512                 } else {
2513                         $vids = Verb::getID($activity);
2514                 }
2515
2516                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2517                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent' => $item_uri];
2518                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2519
2520                 if (DBA::isResult($like_item)) {
2521                         /**
2522                          * Truth table for existing activities
2523                          *
2524                          * |          Inputs            ||      Outputs      |
2525                          * |----------------------------||-------------------|
2526                          * |  Mode  | Event | Same verb || Delete? | Return? |
2527                          * |--------|-------|-----------||---------|---------|
2528                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2529                          * | create |  Yes  |    No     ||   Yes   |   No    |
2530                          * | create |  No   |    Yes    ||   No    |   Yes   |
2531                          * | create |  No   |    No     ||        N/A†       |
2532                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2533                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2534                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2535                          * | delete |  No   |    No     ||        N/A†       |
2536                          * |--------|-------|-----------||---------|---------|
2537                          * |   A    |   B   |     C     || A xor C | !B or C |
2538                          *
2539                          * † Can't happen: It's impossible to find an existing non-event activity without
2540                          *                 the same verb because we are only looking for this single verb.
2541                          *
2542                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2543                          */
2544                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2545                                 self::markForDeletionById($like_item['id']);
2546                         }
2547
2548                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2549                                 return true;
2550                         }
2551                 }
2552
2553                 // No need to go further if we aren't creating anything
2554                 if ($mode == 'delete') {
2555                         return true;
2556                 }
2557
2558                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2559
2560                 $new_item = [
2561                         'guid'          => System::createUUID(),
2562                         'uri'           => self::newURI($item['uid']),
2563                         'uid'           => $item['uid'],
2564                         'contact-id'    => $owner['id'],
2565                         'wall'          => $item['wall'],
2566                         'origin'        => 1,
2567                         'network'       => Protocol::DFRN,
2568                         'protocol'      => Conversation::PARCEL_DIRECT,
2569                         'direction'     => Conversation::PUSH,
2570                         'gravity'       => GRAVITY_ACTIVITY,
2571                         'parent'        => $item['id'],
2572                         'thr-parent'    => $item['uri'],
2573                         'owner-id'      => $author_id,
2574                         'author-id'     => $author_id,
2575                         'body'          => $activity,
2576                         'verb'          => $activity,
2577                         'object-type'   => $objtype,
2578                         'allow_cid'     => $item['allow_cid'],
2579                         'allow_gid'     => $item['allow_gid'],
2580                         'deny_cid'      => $item['deny_cid'],
2581                         'deny_gid'      => $item['deny_gid'],
2582                         'visible'       => 1,
2583                         'unseen'        => 1,
2584                 ];
2585
2586                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2587                 if (!empty($signed)) {
2588                         $new_item['diaspora_signed_text'] = json_encode($signed);
2589                 }
2590
2591                 $new_item_id = self::insert($new_item);
2592
2593                 // If the parent item isn't visible then set it to visible
2594                 if (!$item['visible']) {
2595                         self::update(['visible' => true], ['id' => $item['id']]);
2596                 }
2597
2598                 $new_item['id'] = $new_item_id;
2599
2600                 Hook::callAll('post_local_end', $new_item);
2601
2602                 return true;
2603         }
2604
2605         private static function addThread($itemid, $onlyshadow = false)
2606         {
2607                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2608                         'moderated', 'visible', 'starred', 'contact-id', 'post-type', 'uri-id',
2609                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2610                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2611                 $item = Post::selectFirst($fields, $condition);
2612
2613                 if (!DBA::isResult($item)) {
2614                         return;
2615                 }
2616
2617                 $item['iid'] = $itemid;
2618
2619                 if (!$onlyshadow) {
2620                         $result = DBA::replace('thread', $item);
2621
2622                         Logger::info('Add thread', ['item' => $itemid, 'result' => $result]);
2623                 }
2624         }
2625
2626         private static function updateThread($itemid, $setmention = false)
2627         {
2628                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
2629                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id', 'uri-id',
2630                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
2631
2632                 $item = Post::selectFirst($fields, ['id' => $itemid, 'gravity' => GRAVITY_PARENT]);
2633                 if (!DBA::isResult($item)) {
2634                         return;
2635                 }
2636
2637                 if ($setmention) {
2638                         $item["mention"] = 1;
2639                 }
2640
2641                 $fields = [];
2642
2643                 foreach ($item as $field => $data) {
2644                         if (!in_array($field, ["guid"])) {
2645                                 $fields[$field] = $data;
2646                         }
2647                 }
2648
2649                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
2650
2651                 Logger::info('Update thread', ['item' => $itemid, 'guid' => $item["guid"], 'result' => $result]);
2652         }
2653
2654         private static function deleteThread($itemid, $itemuri = "")
2655         {
2656                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2657                 if (!DBA::isResult($item)) {
2658                         Logger::info('No thread found', ['id' => $itemid]);
2659                         return;
2660                 }
2661
2662                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
2663
2664                 Logger::info('Deleted thread', ['item' => $itemid, 'result' => $result]);
2665
2666                 if ($itemuri != "") {
2667                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
2668                         if (!Post::exists($condition)) {
2669                                 DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
2670                                 Logger::debug('Deleted shadow item', ['id' => $itemid, 'uri' => $itemuri]);
2671                         }
2672                 }
2673         }
2674
2675         /**
2676          * Fetch the SQL condition for the given user id
2677          *
2678          * @param integer $owner_id User ID for which the permissions should be fetched
2679          * @return array condition
2680          */
2681         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2682         {
2683                 $local_user = local_user();
2684                 $remote_user = Session::getRemoteContactID($owner_id);
2685
2686                 // default permissions - anonymous user
2687                 $condition = ["`private` != ?", self::PRIVATE];
2688
2689                 if ($local_user && ($local_user == $owner_id)) {
2690                         // Profile owner - everything is visible
2691                         $condition = [];
2692                 } elseif ($remote_user) {
2693                          // Authenticated visitor - fetch the matching permissionsets
2694                         $set = PermissionSet::get($owner_id, $remote_user);
2695                         if (!empty($set)) {
2696                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2697                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2698                                         self::PRIVATE, self::PRIVATE];
2699                                 $condition = array_merge($condition, $set);
2700                         }
2701                 }
2702
2703                 return $condition;
2704         }
2705
2706         /**
2707          * Get a permission SQL string for the given user
2708          *
2709          * @param int $owner_id
2710          * @param string $table
2711          * @return string
2712          */
2713         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2714         {
2715                 $local_user = local_user();
2716                 $remote_user = Session::getRemoteContactID($owner_id);
2717
2718                 if (!empty($table)) {
2719                         $table = DBA::quoteIdentifier($table) . '.';
2720                 }
2721
2722                 /*
2723                  * Construct permissions
2724                  *
2725                  * default permissions - anonymous user
2726                  */
2727                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2728
2729                 // Profile owner - everything is visible
2730                 if ($local_user && ($local_user == $owner_id)) {
2731                         $sql = '';
2732                 } elseif ($remote_user) {
2733                         /*
2734                          * Authenticated visitor. Unless pre-verified,
2735                          * check that the contact belongs to this $owner_id
2736                          * and load the groups the visitor belongs to.
2737                          * If pre-verified, the caller is expected to have already
2738                          * done this and passed the groups into this function.
2739                          */
2740                         $set = PermissionSet::get($owner_id, $remote_user);
2741
2742                         if (!empty($set)) {
2743                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2744                         } else {
2745                                 $sql_set = '';
2746                         }
2747
2748                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2749                 }
2750
2751                 return $sql;
2752         }
2753
2754         /**
2755          * get translated item type
2756          *
2757          * @param $item
2758          * @return string
2759          */
2760         public static function postType($item)
2761         {
2762                 if (!empty($item['event-id'])) {
2763                         return DI::l10n()->t('event');
2764                 } elseif (!empty($item['resource-id'])) {
2765                         return DI::l10n()->t('photo');
2766                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2767                         return DI::l10n()->t('activity');
2768                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2769                         return DI::l10n()->t('comment');
2770                 }
2771
2772                 return DI::l10n()->t('post');
2773         }
2774
2775         /**
2776          * Sets the "rendered-html" field of the provided item
2777          *
2778          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2779          *
2780          * @param array $item
2781          * @param bool  $update
2782          *
2783          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2784          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2785          */
2786         public static function putInCache(&$item, $update = false)
2787         {
2788                 // Save original body to prevent addons to modify it
2789                 $body = $item['body'];
2790
2791                 $rendered_hash = $item['rendered-hash'] ?? '';
2792                 $rendered_html = $item['rendered-html'] ?? '';
2793
2794                 if ($rendered_hash == ''
2795                         || $rendered_html == ''
2796                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2797                         || DI::config()->get('system', 'ignore_cache')
2798                 ) {
2799                         self::addRedirToImageTags($item);
2800
2801                         $item['rendered-html'] = BBCode::convert($item['body']);
2802                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2803
2804                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2805                         Hook::callAll('put_item_in_cache', $hook_data);
2806                         $item['rendered-html'] = $hook_data['rendered-html'];
2807                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2808                         unset($hook_data);
2809
2810                         // Force an update if the generated values differ from the existing ones
2811                         if ($rendered_hash != $item['rendered-hash']) {
2812                                 $update = true;
2813                         }
2814
2815                         // Only compare the HTML when we forcefully ignore the cache
2816                         if (DI::config()->get('system', 'ignore_cache') && ($rendered_html != $item['rendered-html'])) {
2817                                 $update = true;
2818                         }
2819
2820                         if ($update && !empty($item['id'])) {
2821                                 self::update(
2822                                         [
2823                                                 'rendered-html' => $item['rendered-html'],
2824                                                 'rendered-hash' => $item['rendered-hash']
2825                                         ],
2826                                         ['id' => $item['id']]
2827                                 );
2828                         }
2829                 }
2830
2831                 $item['body'] = $body;
2832         }
2833
2834         /**
2835          * Find any non-embedded images in private items and add redir links to them
2836          *
2837          * @param array &$item The field array of an item row
2838          */
2839         private static function addRedirToImageTags(array &$item)
2840         {
2841                 $app = DI::app();
2842
2843                 $matches = [];
2844                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2845                 if ($cnt) {
2846                         foreach ($matches as $mtch) {
2847                                 if (strpos($mtch[1], '/redir') !== false) {
2848                                         continue;
2849                                 }
2850
2851                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2852                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2853                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2854                                 }
2855                         }
2856                 }
2857         }
2858
2859         /**
2860          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2861          * If attach is true, also add icons for item attachments.
2862          *
2863          * @param array   $item
2864          * @param boolean $attach
2865          * @param boolean $is_preview
2866          * @return string item body html
2867          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2868          * @throws \ImagickException
2869          * @hook  prepare_body_init item array before any work
2870          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2871          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2872          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2873          */
2874         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2875         {
2876                 $a = DI::app();
2877                 Hook::callAll('prepare_body_init', $item);
2878
2879                 // In order to provide theme developers more possibilities, event items
2880                 // are treated differently.
2881                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2882                         $ev = Event::getItemHTML($item);
2883                         return $ev;
2884                 }
2885
2886                 $tags = Tag::populateFromItem($item);
2887
2888                 $item['tags'] = $tags['tags'];
2889                 $item['hashtags'] = $tags['hashtags'];
2890                 $item['mentions'] = $tags['mentions'];
2891
2892                 // Compile eventual content filter reasons
2893                 $filter_reasons = [];
2894                 if (!$is_preview && public_contact() != $item['author-id']) {
2895                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2896                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2897                         }
2898
2899                         $hook_data = [
2900                                 'item' => $item,
2901                                 'filter_reasons' => $filter_reasons
2902                         ];
2903                         Hook::callAll('prepare_body_content_filter', $hook_data);
2904                         $filter_reasons = $hook_data['filter_reasons'];
2905                         unset($hook_data);
2906                 }
2907
2908                 // Update the cached values if there is no "zrl=..." on the links.
2909                 $update = (!Session::isAuthenticated() && ($item["uid"] == 0));
2910
2911                 // Or update it if the current viewer is the intented viewer.
2912                 if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
2913                         $update = true;
2914                 }
2915
2916                 self::putInCache($item, $update);
2917                 $s = $item["rendered-html"];
2918
2919                 $hook_data = [
2920                         'item' => $item,
2921                         'html' => $s,
2922                         'preview' => $is_preview,
2923                         'filter_reasons' => $filter_reasons
2924                 ];
2925                 Hook::callAll('prepare_body', $hook_data);
2926                 $s = $hook_data['html'];
2927                 unset($hook_data);
2928
2929                 if (!$attach) {
2930                         // Replace the blockquotes with quotes that are used in mails.
2931                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2932                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2933                         return $s;
2934                 }
2935
2936                 $as = '';
2937                 $vhead = false;
2938                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2939                         $mime = $attachment['mimetype'];
2940
2941                         $the_url = Contact::magicLinkById($item['author-id'], $attachment['url']);
2942
2943                         if (strpos($mime, 'video') !== false) {
2944                                 if (!$vhead) {
2945                                         $vhead = true;
2946                                         DI::page()['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
2947                                 }
2948
2949                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2950                                         '$video' => [
2951                                                 'id'     => $item['author-id'],
2952                                                 'title'  => DI::l10n()->t('View Video'),
2953                                                 'src'    => $the_url,
2954                                                 'mime'   => $mime,
2955                                         ],
2956                                 ]);
2957                         }
2958
2959                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2960                         if ($filetype) {
2961                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
2962                                 $filesubtype = str_replace('.', '-', $filesubtype);
2963                         } else {
2964                                 $filetype = 'unkn';
2965                                 $filesubtype = 'unkn';
2966                         }
2967
2968                         $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
2969                         $title .= ' ' . ($attachment['size'] ?? 0) . ' ' . DI::l10n()->t('bytes');
2970
2971                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
2972                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
2973                 }
2974
2975                 if ($as != '') {
2976                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
2977                 }
2978
2979                 // Map.
2980                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2981                         $x = Map::byCoordinates(trim($item['coord']));
2982                         if ($x) {
2983                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2984                         }
2985                 }
2986
2987                 // Replace friendica image url size with theme preference.
2988                 if (!empty($a->theme_info['item_image_size'])) {
2989                         $ps = $a->theme_info['item_image_size'];
2990                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2991                 }
2992
2993                 $s = HTML::applyContentFilter($s, $filter_reasons);
2994
2995                 $hook_data = ['item' => $item, 'html' => $s];
2996                 Hook::callAll('prepare_body_final', $hook_data);
2997
2998                 return $hook_data['html'];
2999         }
3000
3001         /**
3002          * get private link for item
3003          *
3004          * @param array $item
3005          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
3006          * @throws \Exception
3007          */
3008         public static function getPlink($item)
3009         {
3010                 if (local_user()) {
3011                         $ret = [
3012                                 'href' => "display/" . $item['guid'],
3013                                 'orig' => "display/" . $item['guid'],
3014                                 'title' => DI::l10n()->t('View on separate page'),
3015                                 'orig_title' => DI::l10n()->t('view on separate page'),
3016                         ];
3017
3018                         if (!empty($item['plink'])) {
3019                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
3020                                 $ret["title"] = DI::l10n()->t('link to source');
3021                         }
3022                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
3023                         $ret = [
3024                                 'href' => $item['plink'],
3025                                 'orig' => $item['plink'],
3026                                 'title' => DI::l10n()->t('link to source'),
3027                         ];
3028                 } else {
3029                         $ret = [];
3030                 }
3031
3032                 return $ret;
3033         }
3034
3035         /**
3036          * Is the given item array a post that is sent as starting post to a forum?
3037          *
3038          * @param array $item
3039          * @param array $owner
3040          *
3041          * @return boolean "true" when it is a forum post
3042          */
3043         public static function isForumPost(array $item, array $owner = [])
3044         {
3045                 if (empty($owner)) {
3046                         $owner = User::getOwnerDataById($item['uid']);
3047                         if (empty($owner)) {
3048                                 return false;
3049                         }
3050                 }
3051
3052                 if (($item['author-id'] == $item['owner-id']) ||
3053                         ($owner['id'] == $item['contact-id']) ||
3054                         ($item['uri'] != $item['parent-uri']) ||
3055                         $item['origin']) {
3056                         return false;
3057                 }
3058
3059                 return Contact::isForum($item['contact-id']);
3060         }
3061
3062         /**
3063          * Search item id for given URI or plink
3064          *
3065          * @param string $uri
3066          * @param integer $uid
3067          *
3068          * @return integer item id
3069          */
3070         public static function searchByLink($uri, $uid = 0)
3071         {
3072                 $ssl_uri = str_replace('http://', 'https://', $uri);
3073                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3074
3075                 $item = DBA::selectFirst('item', ['id'], ['uri' => $uris, 'uid' => $uid]);
3076                 if (DBA::isResult($item)) {
3077                         return $item['id'];
3078                 }
3079
3080                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3081                 if (!DBA::isResult($itemcontent)) {
3082                         return 0;
3083                 }
3084
3085                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3086                 if (!DBA::isResult($itemuri)) {
3087                         return 0;
3088                 }
3089
3090                 $item = DBA::selectFirst('item', ['id'], ['uri' => $itemuri['uri'], 'uid' => $uid]);
3091                 if (DBA::isResult($item)) {
3092                         return $item['id'];
3093                 }
3094
3095                 return 0;
3096         }
3097
3098         /**
3099          * Return the URI for a link to the post
3100          *
3101          * @param string $uri URI or link to post
3102          *
3103          * @return string URI
3104          */
3105         public static function getURIByLink(string $uri)
3106         {
3107                 $ssl_uri = str_replace('http://', 'https://', $uri);
3108                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3109
3110                 $item = DBA::selectFirst('item', ['uri'], ['uri' => $uris]);
3111                 if (DBA::isResult($item)) {
3112                         return $item['uri'];
3113                 }
3114
3115                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3116                 if (!DBA::isResult($itemcontent)) {
3117                         return '';
3118                 }
3119
3120                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3121                 if (DBA::isResult($itemuri)) {
3122                         return $itemuri['uri'];
3123                 }
3124
3125                 return '';
3126         }
3127
3128         /**
3129          * Fetches item for given URI or plink
3130          *
3131          * @param string $uri
3132          * @param integer $uid
3133          *
3134          * @return integer item id
3135          */
3136         public static function fetchByLink(string $uri, int $uid = 0)
3137         {
3138                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
3139                 $item_id = self::searchByLink($uri, $uid);
3140                 if (!empty($item_id)) {
3141                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3142                         return $item_id;
3143                 }
3144
3145                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
3146                         $item_id = self::searchByLink($fetched_uri, $uid);
3147                 } else {
3148                         $item_id = Diaspora::fetchByURL($uri);
3149                 }
3150
3151                 if (!empty($item_id)) {
3152                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3153                         return $item_id;
3154                 }
3155
3156                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
3157                 return 0;
3158         }
3159
3160         /**
3161          * Return share data from an item array (if the item is shared item)
3162          * We are providing the complete Item array, because at some time in the future
3163          * we hopefully will define these values not in the body anymore but in some item fields.
3164          * This function is meant to replace all similar functions in the system.
3165          *
3166          * @param array $item
3167          *
3168          * @return array with share information
3169          */
3170         public static function getShareArray($item)
3171         {
3172                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
3173                         return [];
3174                 }
3175
3176                 $attribute_string = $matches[2];
3177                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
3178                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
3179                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
3180                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
3181                         }
3182                 }
3183                 return $attributes;
3184         }
3185
3186         /**
3187          * Fetch item information for shared items from the original items and adds it.
3188          *
3189          * @param array $item
3190          *
3191          * @return array item array with data from the original item
3192          */
3193         public static function addShareDataFromOriginal(array $item)
3194         {
3195                 $shared = self::getShareArray($item);
3196                 if (empty($shared)) {
3197                         return $item;
3198                 }
3199
3200                 // Real reshares always have got a GUID.
3201                 if (empty($shared['guid'])) {
3202                         return $item;
3203                 }
3204
3205                 $uid = $item['uid'] ?? 0;
3206
3207                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
3208                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
3209                 if (!DBA::isResult($shared_item)) {
3210                         if (empty($shared['link'])) {
3211                                 return $item;
3212                         }
3213
3214                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
3215                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
3216                         if (empty($id)) {
3217                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
3218                                 return $item;
3219                         }
3220
3221                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
3222                         if (!DBA::isResult($shared_item)) {
3223                                 return $item;
3224                         }
3225                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
3226                 } else {
3227                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
3228                 }
3229
3230                 if (!empty($shared_item['title'])) {
3231                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
3232                         unset($shared_item['title']);
3233                 } else {
3234                         $body = $shared_item['body'];
3235                 }
3236
3237                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
3238                 unset($shared_item['body']);
3239
3240                 return array_merge($item, $shared_item);
3241         }
3242
3243         /**
3244          * Check a prospective item array against user-level permissions
3245          *
3246          * @param array $item Expected keys: uri, gravity, and
3247          *                    author-link if is author-id is set,
3248          *                    owner-link if is owner-id is set,
3249          *                    causer-link if is causer-id is set.
3250          * @param int   $user_id Local user ID
3251          * @return bool
3252          * @throws \Exception
3253          */
3254         protected static function isAllowedByUser(array $item, int $user_id)
3255         {
3256                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3257                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3258                         return false;
3259                 }
3260
3261                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3262                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3263                         return false;
3264                 }
3265
3266                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3267                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3268                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3269                         return false;
3270                 }
3271
3272                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3273                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3274                         return false;
3275                 }
3276
3277                 return true;
3278         }
3279 }