src/Model/Item.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use Friendica\Content\Text\BBCode;
  25 use Friendica\Content\Text\HTML;
  26 use Friendica\Core\Hook;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\Renderer;
  30 use Friendica\Core\Session;
  31 use Friendica\Core\System;
  32 use Friendica\Model\Tag;
  33 use Friendica\Core\Worker;
  34 use Friendica\Database\DBA;
  35 use Friendica\Database\DBStructure;
  36 use Friendica\DI;
  37 use Friendica\Model\Post;
  38 use Friendica\Protocol\Activity;
  39 use Friendica\Protocol\ActivityPub;
  40 use Friendica\Protocol\Diaspora;
  41 use Friendica\Util\DateTimeFormat;
  42 use Friendica\Util\Map;
  43 use Friendica\Util\Network;
  44 use Friendica\Util\Strings;
  45 use Friendica\Worker\Delivery;
  46 use LanguageDetection\Language;
  47
  48 class Item
  49 {
  50         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  51         const PT_ARTICLE = 0;
  52         const PT_NOTE = 1;
  53         const PT_PAGE = 2;
  54         const PT_IMAGE = 16;
  55         const PT_AUDIO = 17;
  56         const PT_VIDEO = 18;
  57         const PT_DOCUMENT = 19;
  58         const PT_EVENT = 32;
  59         const PT_TAG = 64;
  60         const PT_TO = 65;
  61         const PT_CC = 66;
  62         const PT_BTO = 67;
  63         const PT_BCC = 68;
  64         const PT_FOLLOWER = 69;
  65         const PT_ANNOUNCEMENT = 70;
  66         const PT_COMMENT = 71;
  67         const PT_STORED = 72;
  68         const PT_GLOBAL = 73;
  69         const PT_RELAY = 74;
  70         const PT_FETCHED = 75;
  71         const PT_PERSONAL_NOTE = 128;
  72
  73         // Field list that is used to display the items
  74         const DISPLAY_FIELDLIST = [
  75                 'uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid', 'network', 'gravity',
  76                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  77                 'wall', 'private', 'starred', 'origin', 'title', 'body', 'file', 'language',
  78                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  79                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'item_id',
  80                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  81                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network',
  82                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type',
  83                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  84                 'writable', 'self', 'cid', 'alias',
  85                 'event-id', 'event-created', 'event-edited', 'event-start', 'event-finish',
  86                 'event-summary', 'event-desc', 'event-location', 'event-type',
  87                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  88                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  89         ];
  90
  91         // Field list that is used to deliver items via the protocols
  92         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  93                         'parent-guid', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  94                         'private', 'title', 'body', 'location', 'coord', 'app',
  95                         'deleted', 'extid', 'post-type', 'gravity',
  96                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
  97                         'author-id', 'author-link', 'owner-link', 'contact-uid',
  98                         'signed_text', 'network'];
  99
 100         // Field list for "item-content" table that is mixed with the item table
 101         const MIXED_CONTENT_FIELDLIST = ['title', 'content-warning', 'body', 'location',
 102                         'coord', 'app', 'rendered-hash', 'rendered-html', 'verb',
 103                         'object-type', 'object', 'target-type', 'target', 'plink'];
 104
 105         // Field list for "item-content" table that is not present in the "item" table
 106         const CONTENT_FIELDLIST = ['language', 'raw-body'];
 107
 108         // All fields in the item table
 109         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 110                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 111                         'contact-id', 'type', 'wall', 'gravity', 'extid', 'icid', 'psid',
 112                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 113                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 114                         'file', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type',
 115                         'private', 'pubmail', 'moderated', 'visible', 'starred', 'bookmark',
 116                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 117                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 118                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 119                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 120                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 121
 122         // List of all verbs that don't need additional content data.
 123         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 124         const ACTIVITIES = [
 125                 Activity::LIKE, Activity::DISLIKE,
 126                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 127                 Activity::FOLLOW,
 128                 Activity::ANNOUNCE];
 129
 130         const PUBLIC = 0;
 131         const PRIVATE = 1;
 132         const UNLISTED = 2;
 133
 134         const TABLES = ['item', 'user-item', 'item-content', 'post-delivery-data', 'diaspora-interaction'];
 135
 136         private static function getItemFields()
 137         {
 138                 $definition = DBStructure::definition('', false);
 139
 140                 $postfields = [];
 141                 foreach (self::TABLES as $table) {
 142                         $postfields[$table] = array_keys($definition[$table]['fields']);
 143                 }
 144
 145                 return $postfields;
 146         }
 147
 148         /**
 149          * Set the pinned state of an item
 150          *
 151          * @param integer $iid    Item ID
 152          * @param integer $uid    User ID
 153          * @param boolean $pinned Pinned state
 154          */
 155         public static function setPinned(int $iid, int $uid, bool $pinned)
 156         {
 157                 DBA::update('user-item', ['pinned' => $pinned], ['iid' => $iid, 'uid' => $uid], true);
 158         }
 159
 160         /**
 161          * Get the pinned state
 162          *
 163          * @param integer $iid Item ID
 164          * @param integer $uid User ID
 165          *
 166          * @return boolean pinned state
 167          */
 168         public static function getPinned(int $iid, int $uid)
 169         {
 170                 $useritem = DBA::selectFirst('user-item', ['pinned'], ['iid' => $iid, 'uid' => $uid]);
 171                 if (!DBA::isResult($useritem)) {
 172                         return false;
 173                 }
 174                 return (bool)$useritem['pinned'];
 175         }
 176
 177         /**
 178          * Update existing item entries
 179          *
 180          * @param array $fields    The fields that are to be changed
 181          * @param array $condition The condition for finding the item entries
 182          *
 183          * In the future we may have to change permissions as well.
 184          * Then we had to add the user id as third parameter.
 185          *
 186          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 187          *
 188          * @return integer|boolean number of affected rows - or "false" if there was an error
 189          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 190          */
 191         public static function update(array $fields, array $condition)
 192         {
 193                 if (empty($condition) || empty($fields)) {
 194                         return false;
 195                 }
 196
 197                 $data_fields = $fields;
 198
 199                 // To ensure the data integrity we do it in an transaction
 200                 DBA::transaction();
 201
 202                 // We cannot simply expand the condition to check for origin entries
 203                 // The condition needn't to be a simple array but could be a complex condition.
 204                 // And we have to execute this query before the update to ensure to fetch the same data.
 205                 $items = DBA::select('item', ['id', 'origin', 'uri', 'uri-id', 'icid', 'uid', 'file'], $condition);
 206
 207                 $content_fields = [];
 208                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
 209                         if (isset($fields[$field])) {
 210                                 $content_fields[$field] = $fields[$field];
 211                                 if (in_array($field, self::CONTENT_FIELDLIST)) {
 212                                         unset($fields[$field]);
 213                                 } else {
 214                                         $fields[$field] = null;
 215                                 }
 216                         }
 217                 }
 218
 219                 $delivery_data = Post\DeliveryData::extractFields($fields);
 220
 221                 $clear_fields = ['bookmark', 'type', 'author-name', 'author-avatar', 'author-link', 'owner-name', 'owner-avatar', 'owner-link', 'postopts', 'inform'];
 222                 foreach ($clear_fields as $field) {
 223                         if (array_key_exists($field, $fields)) {
 224                                 $fields[$field] = null;
 225                         }
 226                 }
 227
 228                 if (array_key_exists('file', $fields)) {
 229                         $files = $fields['file'];
 230                         $fields['file'] = null;
 231                 } else {
 232                         $files = null;
 233                 }
 234
 235                 if (!empty($content_fields['verb'])) {
 236                         $fields['vid'] = Verb::getID($content_fields['verb']);
 237                 }
 238
 239                 if (!empty($fields)) {
 240                         $success = DBA::update('item', $fields, $condition);
 241
 242                         if (!$success) {
 243                                 DBA::close($items);
 244                                 DBA::rollback();
 245                                 return false;
 246                         }
 247                 }
 248
 249                 // When there is no content for the "old" item table, this will count the fetched items
 250                 $rows = DBA::affectedRows();
 251
 252                 $notify_items = [];
 253
 254                 while ($item = DBA::fetch($items)) {
 255                         Post\User::update($item['uri-id'], $item['uid'], $data_fields);
 256
 257                         if (empty($content_fields['verb']) || !in_array($content_fields['verb'], self::ACTIVITIES)) {
 258                                 if (!empty($content_fields['body'])) {
 259                                         $content_fields['raw-body'] = trim($content_fields['raw-body'] ?? $content_fields['body']);
 260
 261                                         // Remove all media attachments from the body and store them in the post-media table
 262                                         $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 263                                         $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 264                                 }
 265
 266                                 self::updateContent($content_fields, ['uri-id' => $item['uri-id']]);
 267
 268                                 if (empty($item['icid'])) {
 269                                         $item_content = DBA::selectFirst('item-content', [], ['uri-id' => $item['uri-id']]);
 270                                         if (DBA::isResult($item_content)) {
 271                                                 $item_fields = ['icid' => $item_content['id']];
 272                                                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 273                                         }
 274                                 }
 275                         }
 276
 277                         if (!is_null($files)) {
 278                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $files);
 279                                 if (!empty($item['file'])) {
 280                                         DBA::update('item', ['file' => ''], ['id' => $item['id']]);
 281                                 }
 282                         }
 283
 284                         if (!empty($fields['attach'])) {
 285                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 286                         }
 287
 288                         Post\DeliveryData::update($item['uri-id'], $delivery_data);
 289
 290                         self::updateThread($item['id']);
 291
 292                         // We only need to notfiy others when it is an original entry from us.
 293                         // Only call the notifier when the item has some content relevant change.
 294                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 295                                 $notify_items[] = $item['id'];
 296                         }
 297                 }
 298
 299                 DBA::close($items);
 300                 DBA::commit();
 301
 302                 foreach ($notify_items as $notify_item) {
 303                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, $notify_item);
 304                 }
 305
 306                 return $rows;
 307         }
 308
 309         /**
 310          * Delete an item and notify others about it - if it was ours
 311          *
 312          * @param array   $condition The condition for finding the item entries
 313          * @param integer $priority  Priority for the notification
 314          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 315          */
 316         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 317         {
 318                 $items = Post::select(['id'], $condition);
 319                 while ($item = Post::fetch($items)) {
 320                         self::markForDeletionById($item['id'], $priority);
 321                 }
 322                 DBA::close($items);
 323         }
 324
 325         /**
 326          * Delete an item for an user and notify others about it - if it was ours
 327          *
 328          * @param array   $condition The condition for finding the item entries
 329          * @param integer $uid       User who wants to delete this item
 330          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 331          */
 332         public static function deleteForUser($condition, $uid)
 333         {
 334                 if ($uid == 0) {
 335                         return;
 336                 }
 337
 338                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 339                 while ($item = Post::fetch($items)) {
 340                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 341
 342                         // "Deleting" global items just means hiding them
 343                         if ($item['uid'] == 0) {
 344                                 DBA::update('user-item', ['hidden' => true], ['iid' => $item['id'], 'uid' => $uid], true);
 345                         } elseif ($item['uid'] == $uid) {
 346                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 347                         } else {
 348                                 Logger::log('Wrong ownership. Not deleting item ' . $item['id']);
 349                         }
 350                 }
 351                 DBA::close($items);
 352         }
 353
 354         /**
 355          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 356          *
 357          * @param integer $item_id
 358          * @param integer $priority Priority for the notification
 359          *
 360          * @return boolean success
 361          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 362          */
 363         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 364         {
 365                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 366                 // locate item to be deleted
 367                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri', 'origin',
 368                         'deleted', 'file', 'resource-id', 'event-id',
 369                         'verb', 'object-type', 'object', 'target', 'contact-id',
 370                         'icid', 'psid', 'gravity'];
 371                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 372                 if (!DBA::isResult($item)) {
 373                         Logger::info('Item not found.', ['id' => $item_id]);
 374                         return false;
 375                 }
 376
 377                 if ($item['deleted']) {
 378                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 379                         return false;
 380                 }
 381
 382                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 383                 if (!DBA::isResult($parent)) {
 384                         $parent = ['origin' => false];
 385                 }
 386
 387                 // clean up categories and tags so they don't end up as orphans
 388
 389                 $matches = [];
 390                 $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
 391
 392                 if ($cnt) {
 393                         foreach ($matches as $mtch) {
 394                                 FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],true);
 395                         }
 396                 }
 397
 398                 $matches = [];
 399
 400                 $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
 401
 402                 if ($cnt) {
 403                         foreach ($matches as $mtch) {
 404                                 FileTag::unsaveFile($item['uid'], $item['id'], $mtch[1],false);
 405                         }
 406                 }
 407
 408                 /*
 409                  * If item is a link to a photo resource, nuke all the associated photos
 410                  * (visitors will not have photo resources)
 411                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 412                  * generate a resource-id and therefore aren't intimately linked to the item.
 413                  */
 414                 /// @TODO: this should first check if photo is used elsewhere
 415                 if (strlen($item['resource-id'])) {
 416                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 417                 }
 418
 419                 // If item is a link to an event, delete the event.
 420                 if (intval($item['event-id'])) {
 421                         Event::delete($item['event-id']);
 422                 }
 423
 424                 // If item has attachments, drop them
 425                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 426                 foreach($attachments as $attachment) {
 427                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 428                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 429                         }
 430                 }
 431
 432                 // Set the item to "deleted"
 433                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 434                 DBA::update('item', $item_fields, ['id' => $item['id']]);
 435
 436                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 437                 self::deleteThread($item['id'], $item['parent-uri']);
 438
 439                 if (!Post::exists(["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
 440                         self::markForDeletion(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
 441                 }
 442
 443                 Post\DeliveryData::delete($item['uri-id']);
 444
 445                 // When the permission set will be used in photo and events as well,
 446                 // this query here needs to be extended.
 447                 // @todo Currently deactivated. We need the permission set in the deletion process.
 448                 // This is a reminder to add the removal somewhere else.
 449                 //if (!empty($item['psid']) && !self::exists(['psid' => $item['psid'], 'deleted' => false])) {
 450                 //      DBA::delete('permissionset', ['id' => $item['psid']], ['cascade' => false]);
 451                 //}
 452
 453                 // If it's the parent of a comment thread, kill all the kids
 454                 if ($item['gravity'] == GRAVITY_PARENT) {
 455                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 456                 }
 457
 458                 // Is it our comment and/or our thread?
 459                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 460                         // When we delete the original post we will delete all existing copies on the server as well
 461                         self::markForDeletion(['uri' => $item['uri'], 'deleted' => false], $priority);
 462
 463                         // send the notification upstream/downstream
 464                         if ($priority) {
 465                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, intval($item['id']));
 466                         }
 467                 } elseif ($item['uid'] != 0) {
 468                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 469
 470                         // When we delete just our local user copy of an item, we have to set a marker to hide it
 471                         $global_item = Post::selectFirst(['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
 472                         if (DBA::isResult($global_item)) {
 473                                 DBA::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
 474                         }
 475                 }
 476
 477                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 478
 479                 return true;
 480         }
 481
 482
 483         private static function guid($item, $notify)
 484         {
 485                 if (!empty($item['guid'])) {
 486                         return Strings::escapeTags(trim($item['guid']));
 487                 }
 488
 489                 if ($notify) {
 490                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 491                         // We add the hash of our own host because our host is the original creator of the post.
 492                         $prefix_host = DI::baseUrl()->getHostname();
 493                 } else {
 494                         $prefix_host = '';
 495
 496                         // We are only storing the post so we create a GUID from the original hostname.
 497                         if (!empty($item['author-link'])) {
 498                                 $parsed = parse_url($item['author-link']);
 499                                 if (!empty($parsed['host'])) {
 500                                         $prefix_host = $parsed['host'];
 501                                 }
 502                         }
 503
 504                         if (empty($prefix_host) && !empty($item['plink'])) {
 505                                 $parsed = parse_url($item['plink']);
 506                                 if (!empty($parsed['host'])) {
 507                                         $prefix_host = $parsed['host'];
 508                                 }
 509                         }
 510
 511                         if (empty($prefix_host) && !empty($item['uri'])) {
 512                                 $parsed = parse_url($item['uri']);
 513                                 if (!empty($parsed['host'])) {
 514                                         $prefix_host = $parsed['host'];
 515                                 }
 516                         }
 517
 518                         // Is it in the format data@host.tld? - Used for mail contacts
 519                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 520                                 $mailparts = explode('@', $item['author-link']);
 521                                 $prefix_host = array_pop($mailparts);
 522                         }
 523                 }
 524
 525                 if (!empty($item['plink'])) {
 526                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 527                 } elseif (!empty($item['uri'])) {
 528                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 529                 } else {
 530                         $guid = System::createUUID(hash('crc32', $prefix_host));
 531                 }
 532
 533                 return $guid;
 534         }
 535
 536         private static function contactId($item)
 537         {
 538                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 539                         return $item['contact-id'];
 540                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 541                         return $item['contact-id'];
 542                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 543                         return $item['author-id'];
 544                 } elseif (!empty($item['contact-id'])) {
 545                         return $item['contact-id'];
 546                 } else {
 547                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 548                         if (!empty($contact_id)) {
 549                                 return $contact_id;
 550                         }
 551                 }
 552                 return $item['author-id'];
 553         }
 554
 555         /**
 556          * Write an item array into a spool file to be inserted later.
 557          * This command is called whenever there are issues storing an item.
 558          *
 559          * @param array $item The item fields that are to be inserted
 560          * @throws \Exception
 561          */
 562         private static function spool($orig_item)
 563         {
 564                 // Now we store the data in the spool directory
 565                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 566                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 567
 568                 $spoolpath = get_spoolpath();
 569                 if ($spoolpath != "") {
 570                         $spool = $spoolpath . '/' . $file;
 571
 572                         file_put_contents($spool, json_encode($orig_item));
 573                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 574                 }
 575         }
 576
 577         /**
 578          * Check if the item array is a duplicate
 579          *
 580          * @param array $item
 581          * @return boolean is it a duplicate?
 582          */
 583         private static function isDuplicate(array $item)
 584         {
 585                 // Checking if there is already an item with the same guid
 586                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 587                 if (Post::exists($condition)) {
 588                         Logger::notice('Found already existing item', [
 589                                 'guid' => $item['guid'],
 590                                 'uid' => $item['uid'],
 591                                 'network' => $item['network']
 592                         ]);
 593                         return true;
 594                 }
 595
 596                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
 597                         $item['uri'], $item['network'], Protocol::DFRN, $item['uid']];
 598                 if (Post::exists($condition)) {
 599                         Logger::notice('duplicated item with the same uri found.', $item);
 600                         return true;
 601                 }
 602
 603                 // On Friendica and Diaspora the GUID is unique
 604                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 605                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 606                         if (Post::exists($condition)) {
 607                                 Logger::notice('duplicated item with the same guid found.', $item);
 608                                 return true;
 609                         }
 610                 } elseif ($item['network'] == Protocol::OSTATUS) {
 611                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 612                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 613                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 614                         if (Post::exists($condition)) {
 615                                 Logger::notice('duplicated item with the same body found.', $item);
 616                                 return true;
 617                         }
 618                 }
 619
 620                 /*
 621                  * Check for already added items.
 622                  * There is a timing issue here that sometimes creates double postings.
 623                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 624                  */
 625                 if (($item['uid'] == 0) && Post::exists(['uri' => trim($item['uri']), 'uid' => 0])) {
 626                         Logger::notice('Global item already stored.', ['uri' => $item['uri'], 'network' => $item['network']]);
 627                         return true;
 628                 }
 629
 630                 return false;
 631         }
 632
 633         /**
 634          * Check if the item array is valid
 635          *
 636          * @param array $item
 637          * @return boolean item is valid
 638          */
 639         public static function isValid(array $item)
 640         {
 641                 // When there is no content then we don't post it
 642                 if ($item['body'] . $item['title'] == '') {
 643                         Logger::notice('No body, no title.');
 644                         return false;
 645                 }
 646
 647                 if (!empty($item['uid'])) {
 648                         $owner = User::getOwnerDataById($item['uid'], false);
 649                         if (!$owner) {
 650                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 651                                 return false;
 652                         }
 653
 654                         if ($owner['account_expired'] || $owner['account_removed']) {
 655                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 656                                 return false;
 657                         }
 658                 }
 659
 660                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 661                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 662                         return false;
 663                 }
 664
 665                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 666                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 667                         return false;
 668                 }
 669
 670                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 671                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 672                         return false;
 673                 }
 674
 675                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 676                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 677                         return false;
 678                 }
 679
 680                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 681                         return false;
 682                 }
 683
 684                 if ($item['verb'] == Activity::FOLLOW) {
 685                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 686                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 687                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 688                                 return false;
 689                         }
 690
 691                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 692                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 693                         if (Post::exists($condition)) {
 694                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 695                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 696                                 return false;
 697                         }
 698                 }
 699
 700                 return true;
 701         }
 702
 703         /**
 704          * Check if the item array is too old
 705          *
 706          * @param array $item
 707          * @return boolean item is too old
 708          */
 709         public static function isTooOld(array $item)
 710         {
 711                 // check for create date and expire time
 712                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 713
 714                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 715                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 716                         $expire_interval = $user['expire'];
 717                 }
 718
 719                 if (($expire_interval > 0) && !empty($item['created'])) {
 720                         $expire_date = time() - ($expire_interval * 86400);
 721                         $created_date = strtotime($item['created']);
 722                         if ($created_date < $expire_date) {
 723                                 Logger::notice('Item created before expiration interval.', [
 724                                         'created' => date('c', $created_date),
 725                                         'expired' => date('c', $expire_date),
 726                                         '$item' => $item
 727                                 ]);
 728                                 return true;
 729                         }
 730                 }
 731
 732                 return false;
 733         }
 734
 735         /**
 736          * Return the id of the given item array if it has been stored before
 737          *
 738          * @param array $item
 739          * @return integer item id
 740          */
 741         private static function getDuplicateID(array $item)
 742         {
 743                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 744                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 745                                 trim($item['uri']), $item['uid'],
 746                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 747                         $existing = Post::selectFirst(['id', 'network'], $condition);
 748                         if (DBA::isResult($existing)) {
 749                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 750                                 if ($item['uid'] != 0) {
 751                                         Logger::notice('Item already existed for user', [
 752                                                 'uri' => $item['uri'],
 753                                                 'uid' => $item['uid'],
 754                                                 'network' => $item['network'],
 755                                                 'existing_id' => $existing["id"],
 756                                                 'existing_network' => $existing["network"]
 757                                         ]);
 758                                 }
 759
 760                                 return $existing["id"];
 761                         }
 762                 }
 763                 return 0;
 764         }
 765
 766         /**
 767          * Fetch top-level parent data for the given item array
 768          *
 769          * @param array $item
 770          * @return array item array with parent data
 771          * @throws \Exception
 772          */
 773         private static function getTopLevelParent(array $item)
 774         {
 775                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 776                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 777                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 778                 $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid']];
 779                 $params = ['order' => ['id' => false]];
 780                 $parent = Post::selectFirst($fields, $condition, $params);
 781
 782                 if (!DBA::isResult($parent)) {
 783                         Logger::notice('item parent was not found - ignoring item', ['thr-parent' => $item['thr-parent'], 'uid' => $item['uid']]);
 784                         return [];
 785                 }
 786
 787                 if ($parent['uri'] == $parent['parent-uri']) {
 788                         return $parent;
 789                 }
 790
 791                 $condition = ['uri' => $parent['parent-uri'],
 792                         'parent-uri' => $parent['parent-uri'],
 793                         'uid' => $parent['uid']];
 794                 $params = ['order' => ['id' => false]];
 795                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 796                 if (!DBA::isResult($toplevel_parent)) {
 797                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri' => $parent['parent-uri'], 'uid' => $parent['uid']]);
 798                         return [];
 799                 }
 800
 801                 return $toplevel_parent;
 802         }
 803
 804         /**
 805          * Get the gravity for the given item array
 806          *
 807          * @param array $item
 808          * @return integer gravity
 809          */
 810         private static function getGravity(array $item)
 811         {
 812                 $activity = DI::activity();
 813
 814                 if (isset($item['gravity'])) {
 815                         return intval($item['gravity']);
 816                 } elseif ($item['parent-uri'] === $item['uri']) {
 817                         return GRAVITY_PARENT;
 818                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 819                         return GRAVITY_COMMENT;
 820                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 821                         return GRAVITY_ACTIVITY;
 822                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 823                         return GRAVITY_ACTIVITY;
 824                 }
 825                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 826                 return GRAVITY_UNKNOWN;   // Should not happen
 827         }
 828
 829         public static function insert($item, $notify = false, $dontcache = false)
 830         {
 831                 $structure = self::getItemFields();
 832
 833                 $orig_item = $item;
 834
 835                 $priority = PRIORITY_HIGH;
 836
 837                 // If it is a posting where users should get notifications, then define it as wall posting
 838                 if ($notify) {
 839                         $item['wall'] = 1;
 840                         $item['origin'] = 1;
 841                         $item['network'] = Protocol::DFRN;
 842                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 843                         $item['direction'] = Conversation::PUSH;
 844
 845                         if (in_array($notify, PRIORITIES)) {
 846                                 $priority = $notify;
 847                         }
 848                 } else {
 849                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 850                 }
 851
 852                 $uid = intval($item['uid']);
 853
 854                 $item['guid'] = self::guid($item, $notify);
 855                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 856
 857                 // Store URI data
 858                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 859
 860                 // Backward compatibility: parent-uri used to be the direct parent uri.
 861                 // If it is provided without a thr-parent, it probably is the old behavior.
 862                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 863                 $item['parent-uri'] = $item['thr-parent'];
 864
 865                 // Store conversation data
 866                 $item = Conversation::insert($item);
 867
 868                 /*
 869                  * Do we already have this item?
 870                  * We have to check several networks since Friendica posts could be repeated
 871                  * via OStatus (maybe Diasporsa as well)
 872                  */
 873                 $duplicate = self::getDuplicateID($item);
 874                 if ($duplicate) {
 875                         return $duplicate;
 876                 }
 877
 878                 // Additional duplicate checks
 879                 /// @todo Check why the first duplication check returns the item number and the second a 0
 880                 if (self::isDuplicate($item)) {
 881                         return 0;
 882                 }
 883
 884                 $item['wall']          = intval($item['wall'] ?? 0);
 885                 $item['extid']         = trim($item['extid'] ?? '');
 886                 $item['author-name']   = trim($item['author-name'] ?? '');
 887                 $item['author-link']   = trim($item['author-link'] ?? '');
 888                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 889                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 890                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 891                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 892                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 893                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 894                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 895                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 896                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 897                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 898                 $item['location']      = trim($item['location'] ?? '');
 899                 $item['coord']         = trim($item['coord'] ?? '');
 900                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 901                 $item['deleted']       = 0;
 902                 $item['post-type']     = ($item['post-type'] ?? '') ?: self::PT_ARTICLE;
 903                 $item['verb']          = trim($item['verb'] ?? '');
 904                 $item['object-type']   = trim($item['object-type'] ?? '');
 905                 $item['object']        = trim($item['object'] ?? '');
 906                 $item['target-type']   = trim($item['target-type'] ?? '');
 907                 $item['target']        = trim($item['target'] ?? '');
 908                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 909                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 910                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 911                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 912                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 913                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 914                 $item['body']          = trim($item['body'] ?? '');
 915                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 916                 $item['app']           = trim($item['app'] ?? '');
 917                 $item['origin']        = intval($item['origin'] ?? 0);
 918                 $item['postopts']      = trim($item['postopts'] ?? '');
 919                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 920                 $item['event-id']      = intval($item['event-id'] ?? 0);
 921                 $item['inform']        = trim($item['inform'] ?? '');
 922                 $item['file']          = trim($item['file'] ?? '');
 923
 924                 // Items cannot be stored before they happen ...
 925                 if ($item['created'] > DateTimeFormat::utcNow()) {
 926                         $item['created'] = DateTimeFormat::utcNow();
 927                 }
 928
 929                 // We haven't invented time travel by now.
 930                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 931                         $item['edited'] = DateTimeFormat::utcNow();
 932                 }
 933
 934                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 935
 936                 $item['gravity'] = self::getGravity($item);
 937
 938                 $item['language'] = self::getLanguage($item);
 939
 940                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 941                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 942                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 943
 944                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 945                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 946                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 947
 948                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 949                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 950                         $item['post-type'] = self::PT_FOLLOWER;
 951                 }
 952
 953                 // Ensure that there is an avatar cache
 954                 Contact::checkAvatarCache($item['author-id']);
 955                 Contact::checkAvatarCache($item['owner-id']);
 956
 957                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 958                 $item["contact-id"] = self::contactId($item);
 959
 960                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 961                         self::isTooOld($item)) {
 962                         Logger::info('Item is too old', ['item' => $item]);
 963                         return 0;
 964                 }
 965
 966                 if (!self::isValid($item)) {
 967                         return 0;
 968                 }
 969
 970                 if ($item['gravity'] !== GRAVITY_PARENT) {
 971                         $toplevel_parent = self::getTopLevelParent($item);
 972                         if (empty($toplevel_parent)) {
 973                                 return 0;
 974                         }
 975
 976                         // If the thread originated from this node, we check the permission against the thread starter
 977                         $condition = ['uri' => $toplevel_parent['uri'], 'wall' => true];
 978                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 979                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 980                                 return 0;
 981                         }
 982
 983                         $parent_id          = $toplevel_parent['id'];
 984                         $item['parent-uri'] = $toplevel_parent['uri'];
 985                         $item['deleted']    = $toplevel_parent['deleted'];
 986                         $item['allow_cid']  = $toplevel_parent['allow_cid'];
 987                         $item['allow_gid']  = $toplevel_parent['allow_gid'];
 988                         $item['deny_cid']   = $toplevel_parent['deny_cid'];
 989                         $item['deny_gid']   = $toplevel_parent['deny_gid'];
 990                         $parent_origin      = $toplevel_parent['origin'];
 991
 992                         // Don't federate received participation messages
 993                         if ($item['verb'] != Activity::FOLLOW) {
 994                                 $item['wall'] = $toplevel_parent['wall'];
 995                         } else {
 996                                 $item['wall'] = false;
 997                         }
 998
 999                         /*
1000                          * If the parent is private, force privacy for the entire conversation
1001                          * This differs from the above settings as it subtly allows comments from
1002                          * email correspondents to be private even if the overall thread is not.
1003                          */
1004                         if ($toplevel_parent['private']) {
1005                                 $item['private'] = $toplevel_parent['private'];
1006                         }
1007
1008                         /*
1009                          * Edge case. We host a public forum that was originally posted to privately.
1010                          * The original author commented, but as this is a comment, the permissions
1011                          * weren't fixed up so it will still show the comment as private unless we fix it here.
1012                          */
1013                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
1014                                 $item['private'] = self::PUBLIC;
1015                         }
1016
1017                         // If its a post that originated here then tag the thread as "mention"
1018                         if ($item['origin'] && $item['uid']) {
1019                                 DBA::update('thread', ['mention' => true], ['iid' => $parent_id]);
1020                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'uid' => $item['uid']]);
1021                         }
1022
1023                         // Update the contact relations
1024                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
1025
1026                         unset($item['parent_origin']);
1027                 } else {
1028                         $parent_id = 0;
1029                         $parent_origin = $item['origin'];
1030                 }
1031
1032                 // We don't store the causer link, only the id
1033                 unset($item['causer-link']);
1034
1035                 // We don't store these fields anymore in the item table
1036                 unset($item['author-link']);
1037                 unset($item['author-name']);
1038                 unset($item['author-avatar']);
1039                 unset($item['author-network']);
1040
1041                 unset($item['owner-link']);
1042                 unset($item['owner-name']);
1043                 unset($item['owner-avatar']);
1044
1045                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
1046                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
1047
1048                 // Is this item available in the global items (with uid=0)?
1049                 if ($item["uid"] == 0) {
1050                         $item["global"] = true;
1051
1052                         // Set the global flag on all items if this was a global item entry
1053                         DBA::update('item', ['global' => true], ['uri' => $item["uri"]]);
1054                 } else {
1055                         $item["global"] = Post::exists(['uid' => 0, 'uri' => $item["uri"]]);
1056                 }
1057
1058                 // ACL settings
1059                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
1060                         $item["private"] = self::PRIVATE;
1061                 }
1062
1063                 if ($notify) {
1064                         $item['edit'] = false;
1065                         $item['parent'] = $parent_id;
1066                         Hook::callAll('post_local', $item);
1067                         unset($item['edit']);
1068                 } else {
1069                         Hook::callAll('post_remote', $item);
1070                 }
1071
1072                 // Set after the insert because top-level posts are self-referencing
1073                 unset($item['parent']);
1074
1075                 if (!empty($item['cancel'])) {
1076                         Logger::log('post cancelled by addon.');
1077                         return 0;
1078                 }
1079
1080                 if (empty($item['vid']) && !empty($item['verb'])) {
1081                         $item['vid'] = Verb::getID($item['verb']);
1082                 }
1083
1084                 // Creates or assigns the permission set
1085                 $item['psid'] = PermissionSet::getIdFromACL(
1086                         $item['uid'],
1087                         $item['allow_cid'],
1088                         $item['allow_gid'],
1089                         $item['deny_cid'],
1090                         $item['deny_gid']
1091                 );
1092
1093                 unset($item['allow_cid']);
1094                 unset($item['allow_gid']);
1095                 unset($item['deny_cid']);
1096                 unset($item['deny_gid']);
1097
1098                 // This array field is used to trigger some automatic reactions
1099                 // It is mainly used in the "post_local" hook.
1100                 unset($item['api_source']);
1101
1102                 if ($item['verb'] == Activity::ANNOUNCE) {
1103                         self::setOwnerforResharedItem($item);
1104                 }
1105
1106                 // Remove all media attachments from the body and store them in the post-media table
1107                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
1108                 $item['raw-body'] = self::setHashtags($item['raw-body']);
1109
1110                 // Check for hashtags in the body and repair or add hashtag links
1111                 $item['body'] = self::setHashtags($item['body']);
1112
1113                 if (!empty($item['attach'])) {
1114                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
1115                 }
1116
1117                 // Fill the cache field
1118                 self::putInCache($item);
1119
1120                 if (stristr($item['verb'], Activity::POKE)) {
1121                         $notify_type = Delivery::POKE;
1122                 } else {
1123                         $notify_type = Delivery::POST;
1124                 }
1125
1126                 if (!in_array($item['verb'], self::ACTIVITIES)) {
1127                         $item['icid'] = self::insertContent($item);
1128                         if (empty($item['icid'])) {
1129                                 // This shouldn't happen
1130                                 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']]);
1131                                 return 0;
1132                         }
1133                 }
1134
1135                 $body = $item['body'];
1136                 $verb = $item['verb'];
1137
1138                 // We just remove everything that is content
1139                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1140                         unset($item[$field]);
1141                 }
1142
1143                 unset($item['activity']);
1144
1145                 // Filling item related side tables
1146
1147                 // Diaspora signature
1148                 if (!empty($item['diaspora_signed_text'])) {
1149                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
1150                 }
1151
1152                 unset($item['diaspora_signed_text']);
1153
1154                 // Attached file links
1155                 if (!empty($item['file'])) {
1156                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1157                 }
1158
1159                 unset($item['file']);
1160
1161                 // Delivery relevant data
1162                 $delivery_data = Post\DeliveryData::extractFields($item);
1163                 unset($item['postopts']);
1164                 unset($item['inform']);
1165
1166                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1167                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1168                 }
1169
1170                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1171                 if (!Tag::existsForPost($item['uri-id'])) {
1172                         Tag::storeFromBody($item['uri-id'], $body);
1173                 }
1174
1175                 if (Post\User::insert($item['uri-id'], $item['uid'], $item)) {
1176                         // Remove all fields that aren't part of the item table
1177                         foreach ($item as $field => $value) {
1178                                 if (!in_array($field, $structure['item'])) {
1179                                         unset($item[$field]);
1180                                 }
1181                         }
1182
1183                         $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'network' => $item['network']];
1184                         if (DBA::exists('item', $condition)) {
1185                                 Logger::notice('Item is already inserted - aborting', $condition);
1186                                 return 0;
1187                         }
1188
1189                         $result = DBA::insert('item', $item);
1190
1191                         // When the item was successfully stored we fetch the ID of the item.
1192                         $current_post = DBA::lastInsertId();
1193                 } else {
1194                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1195                         return 0;
1196                 }
1197
1198                 if (empty($current_post) || !DBA::isResult($result)) {
1199                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1200                         Logger::warning('Could not store item. it will be spooled', ['result' => $result, 'id' => $current_post]);
1201                         self::spool($orig_item);
1202                         return 0;
1203                 }
1204
1205                 Logger::notice('created item', ['id' => $current_post, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1206
1207                 if (!$parent_id || ($item['gravity'] === GRAVITY_PARENT)) {
1208                         $parent_id = $current_post;
1209                 }
1210
1211                 // Set parent id
1212                 DBA::update('item', ['parent' => $parent_id], ['id' => $current_post]);
1213
1214                 $item['id'] = $current_post;
1215                 $item['parent'] = $parent_id;
1216
1217                 // update the commented timestamp on the parent
1218                 if (DI::config()->get('system', 'like_no_comment')) {
1219                         // Update when it is a comment
1220                         $update_commented = in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1221                 } else {
1222                         // Update when it isn't a follow or tag verb
1223                         $update_commented = !in_array($verb, [Activity::FOLLOW, Activity::TAG]);
1224                 }
1225
1226                 if ($update_commented) {
1227                         DBA::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1228                 } else {
1229                         DBA::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
1230                 }
1231
1232                 if ($item['gravity'] === GRAVITY_PARENT) {
1233                         self::addThread($current_post);
1234                 } else {
1235                         self::updateThread($parent_id);
1236                 }
1237
1238                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1239                 if (self::tagDeliver($item['uid'], $current_post)) {
1240                         // Get the user information for the logging
1241                         $user = User::getById($uid);
1242
1243                         Logger::notice('Item had been deleted', ['id' => $current_post, 'user' => $uid, 'account-type' => $user['account-type']]);
1244                         return 0;
1245                 }
1246
1247                 if (!$dontcache) {
1248                         $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $current_post]);
1249                         if (DBA::isResult($posted_item)) {
1250                                 if ($notify) {
1251                                         Hook::callAll('post_local_end', $posted_item);
1252                                 } else {
1253                                         Hook::callAll('post_remote_end', $posted_item);
1254                                 }
1255                         } else {
1256                                 Logger::log('new item not found in DB, id ' . $current_post);
1257                         }
1258                 }
1259
1260                 if ($item['gravity'] === GRAVITY_PARENT) {
1261                         self::addShadow($current_post);
1262                 } else {
1263                         self::addShadowPost($current_post);
1264                 }
1265
1266                 self::updateContact($item);
1267
1268                 UserItem::setNotification($current_post);
1269
1270                 check_user_notification($current_post);
1271
1272                 // Distribute items to users who subscribed to their tags
1273                 self::distributeByTags($item);
1274
1275                 // Automatically reshare the item if the "remote_self" option is selected
1276                 self::autoReshare($item);
1277
1278                 $transmit = $notify || ($item['visible'] && ($parent_origin || $item['origin']));
1279
1280                 if ($transmit) {
1281                         $transmit_item = Post::selectFirst(['verb', 'origin'], ['id' => $item['id']]);
1282                         // Don't relay participation messages
1283                         if (($transmit_item['verb'] == Activity::FOLLOW) &&
1284                                 (!$transmit_item['origin'] || ($item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1285                                 Logger::info('Participation messages will not be relayed', ['item' => $item['id'], 'uri' => $item['uri'], 'verb' => $transmit_item['verb']]);
1286                                 $transmit = false;
1287                         }
1288                 }
1289
1290                 if ($transmit) {
1291                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, $current_post);
1292                 }
1293
1294                 return $current_post;
1295         }
1296
1297         /**
1298          * Change the owner of a parent item if it had been shared by a forum
1299          *
1300          * (public) forum posts in the new format consist of the regular post by the author
1301          * followed by an announce message sent from the forum account.
1302          * Changing the owner helps in grouping forum posts.
1303          *
1304          * @param array $item
1305          * @return void
1306          */
1307         private static function setOwnerforResharedItem(array $item)
1308         {
1309                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-type'],
1310                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1311                 if (!DBA::isResult($parent)) {
1312                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1313                         return;
1314                 }
1315
1316                 $author = Contact::selectFirst(['url', 'contact-type'], ['id' => $item['author-id']]);
1317                 if (!DBA::isResult($author)) {
1318                         Logger::error('Author not found', ['id' => $item['author-id']]);
1319                         return;
1320                 }
1321
1322                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1323                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1324                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid']]);
1325                         return;
1326                 }
1327
1328                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1329                         if ($parent['post-type'] == self::PT_ANNOUNCEMENT) {
1330                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1331                                 return;
1332                         }
1333
1334                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1335                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1336                                 return;
1337                         }
1338                         self::update(['post-type' => self::PT_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1339                         Logger::info('Set announcement post-type', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1340                         return;
1341                 }
1342
1343                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1344                 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]);
1345         }
1346
1347         /**
1348          * Distribute the given item to users who subscribed to their tags
1349          *
1350          * @param array $item     Processed item
1351          */
1352         private static function distributeByTags(array $item)
1353         {
1354                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1355                         return;
1356                 }
1357
1358                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1359                 foreach ($uids as $uid) {
1360                         if (Contact::isSharing($item['author-id'], $uid)) {
1361                                 $fields = [];
1362                         } else {
1363                                 $fields = ['post-type' => self::PT_TAG];
1364                         }
1365
1366                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1367                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1368                 }
1369         }
1370
1371         /**
1372          * Insert a new item content entry
1373          *
1374          * @param array $item The item fields that are to be inserted
1375          * @throws \Exception
1376          */
1377         private static function insertContent(array $item)
1378         {
1379                 $fields = ['uri-plink-hash' => (string)$item['uri-id'], 'uri-id' => $item['uri-id']];
1380
1381                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1382                         if (isset($item[$field])) {
1383                                 $fields[$field] = $item[$field];
1384                         }
1385                 }
1386
1387                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-id' => $item['uri-id']]);
1388                 if (DBA::isResult($item_content)) {
1389                         $icid = $item_content['id'];
1390                         Logger::info('Existing content found', ['icid' => $icid, 'uri' => $item['uri']]);
1391                         return $icid;
1392                 }
1393
1394                 DBA::replace('item-content', $fields);
1395
1396                 $item_content = DBA::selectFirst('item-content', ['id'], ['uri-id' => $item['uri-id']]);
1397                 if (DBA::isResult($item_content)) {
1398                         $icid = $item_content['id'];
1399                         Logger::notice('Content inserted', ['icid' => $icid, 'uri' => $item['uri']]);
1400                         return $icid;
1401                 }
1402
1403                 // This shouldn't happen.
1404                 Logger::error("Content wasn't inserted", $item);
1405                 return null;
1406         }
1407
1408         /**
1409          * Update existing item content entries
1410          *
1411          * @param array $item      The item fields that are to be changed
1412          * @param array $condition The condition for finding the item content entries
1413          * @throws \Exception
1414          */
1415         private static function updateContent($item, $condition)
1416         {
1417                 // We have to select only the fields from the "item-content" table
1418                 $fields = [];
1419                 foreach (array_merge(self::CONTENT_FIELDLIST, self::MIXED_CONTENT_FIELDLIST) as $field) {
1420                         if (isset($item[$field])) {
1421                                 $fields[$field] = $item[$field];
1422                         }
1423                 }
1424
1425                 if (empty($fields)) {
1426                         return;
1427                 }
1428
1429                 DBA::update('item-content', $fields, $condition, true);
1430                 Logger::info('Updated content', ['condition' => $condition]);
1431         }
1432
1433         /**
1434          * Distributes public items to the receivers
1435          *
1436          * @param integer $itemid      Item ID that should be added
1437          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1438          * @throws \Exception
1439          */
1440         public static function distribute($itemid, $signed_text = '')
1441         {
1442                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
1443                 $parent = Post::selectFirst(['owner-id'], $condition);
1444                 if (!DBA::isResult($parent)) {
1445                         return;
1446                 }
1447
1448                 // Only distribute public items from native networks
1449                 $condition = ['id' => $itemid, 'uid' => 0,
1450                         'network' => array_merge(Protocol::FEDERATED ,['']),
1451                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1452                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1453                 if (!DBA::isResult($item)) {
1454                         return;
1455                 }
1456
1457                 $origin = $item['origin'];
1458
1459                 $users = [];
1460
1461                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1462                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1463                 if (!DBA::isResult($owner)) {
1464                         return;
1465                 }
1466
1467                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1468                 $contacts = DBA::select('contact', ['uid'], $condition);
1469                 while ($contact = DBA::fetch($contacts)) {
1470                         if ($contact['uid'] == 0) {
1471                                 continue;
1472                         }
1473
1474                         $users[$contact['uid']] = $contact['uid'];
1475                 }
1476                 DBA::close($contacts);
1477
1478                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1479                 $contacts = DBA::select('contact', ['uid'], $condition);
1480                 while ($contact = DBA::fetch($contacts)) {
1481                         if ($contact['uid'] == 0) {
1482                                 continue;
1483                         }
1484
1485                         $users[$contact['uid']] = $contact['uid'];
1486                 }
1487                 DBA::close($contacts);
1488
1489                 if (!empty($owner['alias'])) {
1490                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1491                         $contacts = DBA::select('contact', ['uid'], $condition);
1492                         while ($contact = DBA::fetch($contacts)) {
1493                                 if ($contact['uid'] == 0) {
1494                                         continue;
1495                                 }
1496
1497                                 $users[$contact['uid']] = $contact['uid'];
1498                         }
1499                         DBA::close($contacts);
1500                 }
1501
1502                 $origin_uid = 0;
1503
1504                 if ($item['uri'] != $item['parent-uri']) {
1505                         $parents = Post::select(['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
1506                         while ($parent = Post::fetch($parents)) {
1507                                 $users[$parent['uid']] = $parent['uid'];
1508                                 if ($parent['origin'] && !$origin) {
1509                                         $origin_uid = $parent['uid'];
1510                                 }
1511                         }
1512                         DBA::close($parents);
1513                 }
1514
1515                 foreach ($users as $uid) {
1516                         if ($origin_uid == $uid) {
1517                                 $item['diaspora_signed_text'] = $signed_text;
1518                         }
1519                         self::storeForUser($item, $uid);
1520                 }
1521         }
1522
1523         /**
1524          * Store a public item defined by their URI-ID for the given users
1525          *
1526          * @param integer $uri_id URI-ID of the given item
1527          * @param integer $uid    The user that will receive the item entry
1528          * @param array   $fields Additional fields to be stored
1529          * @return integer stored item id
1530          */
1531         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1532         {
1533                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1534                 if (!DBA::isResult($item)) {
1535                         return 0;
1536                 }
1537
1538                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1539                         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']]);
1540                         return 0;
1541                 }
1542
1543                 $item['post-type'] = self::PT_STORED;
1544
1545                 $item = array_merge($item, $fields);
1546
1547                 $stored = self::storeForUser($item, $uid);
1548                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1549                 return $stored;
1550         }
1551
1552         /**
1553          * Store a public item array for the given users
1554          *
1555          * @param array   $item   The item entry that will be stored
1556          * @param integer $uid    The user that will receive the item entry
1557          * @return integer stored item id
1558          * @throws \Exception
1559          */
1560         private static function storeForUser(array $item, int $uid)
1561         {
1562                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1563                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1564                         return 0;
1565                 }
1566
1567                 unset($item['id']);
1568                 unset($item['parent']);
1569                 unset($item['mention']);
1570                 unset($item['starred']);
1571                 unset($item['unseen']);
1572                 unset($item['psid']);
1573
1574                 $item['uid'] = $uid;
1575                 $item['origin'] = 0;
1576                 $item['wall'] = 0;
1577
1578                 if ($item['gravity'] == GRAVITY_PARENT) {
1579                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1580                 } else {
1581                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1582                 }
1583
1584                 if (!empty($contact['id'])) {
1585                         $item['contact-id'] = $contact['id'];
1586                 } else {
1587                         // Shouldn't happen at all
1588                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1589                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1590                         if (!DBA::isResult($self)) {
1591                                 // Shouldn't happen even less
1592                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1593                                 return 0;
1594                         }
1595                         $item['contact-id'] = $self['id'];
1596                 }
1597
1598                 /// @todo Handling of "event-id"
1599
1600                 $notify = false;
1601                 if ($item['gravity'] == GRAVITY_PARENT) {
1602                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1603                         if (DBA::isResult($contact)) {
1604                                 $notify = self::isRemoteSelf($contact, $item);
1605                         }
1606                 }
1607
1608                 $distributed = self::insert($item, $notify, true);
1609
1610                 if (!$distributed) {
1611                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1612                 } else {
1613                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1614                 }
1615                 return $distributed;
1616         }
1617
1618         /**
1619          * Add a shadow entry for a given item id that is a thread starter
1620          *
1621          * We store every public item entry additionally with the user id "0".
1622          * This is used for the community page and for the search.
1623          * It is planned that in the future we will store public item entries only once.
1624          *
1625          * @param integer $itemid Item ID that should be added
1626          * @throws \Exception
1627          */
1628         private static function addShadow($itemid)
1629         {
1630                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network', 'uri'];
1631                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1632                 $item = Post::selectFirst($fields, $condition);
1633
1634                 if (!DBA::isResult($item)) {
1635                         return;
1636                 }
1637
1638                 // is it already a copy?
1639                 if (($itemid == 0) || ($item['uid'] == 0)) {
1640                         return;
1641                 }
1642
1643                 // Is it a visible public post?
1644                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || ($item["private"] == self::PRIVATE)) {
1645                         return;
1646                 }
1647
1648                 // is it an entry from a connector? Only add an entry for natively connected networks
1649                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1650                         return;
1651                 }
1652
1653                 if (Post::exists(['uri' => $item['uri'], 'uid' => 0])) {
1654                         return;
1655                 }
1656
1657                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1658
1659                 if (DBA::isResult($item)) {
1660                         // Preparing public shadow (removing user specific data)
1661                         $item['uid'] = 0;
1662                         unset($item['id']);
1663                         unset($item['parent']);
1664                         unset($item['wall']);
1665                         unset($item['mention']);
1666                         unset($item['origin']);
1667                         unset($item['starred']);
1668                         unset($item['postopts']);
1669                         unset($item['inform']);
1670                         unset($item['post-type']);
1671                         if ($item['uri'] == $item['parent-uri']) {
1672                                 $item['contact-id'] = $item['owner-id'];
1673                         } else {
1674                                 $item['contact-id'] = $item['author-id'];
1675                         }
1676
1677                         $public_shadow = self::insert($item, false, true);
1678
1679                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1680                 }
1681         }
1682
1683         /**
1684          * Add a shadow entry for a given item id that is a comment
1685          *
1686          * This function does the same like the function above - but for comments
1687          *
1688          * @param integer $itemid Item ID that should be added
1689          * @throws \Exception
1690          */
1691         private static function addShadowPost($itemid)
1692         {
1693                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1694                 if (!DBA::isResult($item)) {
1695                         return;
1696                 }
1697
1698                 // Is it a toplevel post?
1699                 if ($item['gravity'] == GRAVITY_PARENT) {
1700                         self::addShadow($itemid);
1701                         return;
1702                 }
1703
1704                 // Is this a shadow entry?
1705                 if ($item['uid'] == 0) {
1706                         return;
1707                 }
1708
1709                 // Is there a shadow parent?
1710                 if (!Post::exists(['uri' => $item['parent-uri'], 'uid' => 0])) {
1711                         return;
1712                 }
1713
1714                 // Is there already a shadow entry?
1715                 if (Post::exists(['uri' => $item['uri'], 'uid' => 0])) {
1716                         return;
1717                 }
1718
1719                 // Save "origin" and "parent" state
1720                 $origin = $item['origin'];
1721                 $parent = $item['parent'];
1722
1723                 // Preparing public shadow (removing user specific data)
1724                 $item['uid'] = 0;
1725                 unset($item['id']);
1726                 unset($item['parent']);
1727                 unset($item['wall']);
1728                 unset($item['mention']);
1729                 unset($item['origin']);
1730                 unset($item['starred']);
1731                 unset($item['postopts']);
1732                 unset($item['inform']);
1733                 unset($item['post-type']);
1734                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1735
1736                 $public_shadow = self::insert($item, false, true);
1737
1738                 Logger::info('Stored public shadow', ['uri' => $item['uri'], 'id' => $public_shadow]);
1739
1740                 // If this was a comment to a Diaspora post we don't get our comment back.
1741                 // This means that we have to distribute the comment by ourselves.
1742                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1743                         self::distribute($public_shadow);
1744                 }
1745         }
1746
1747         /**
1748          * Adds a language specification in a "language" element of given $arr.
1749          * Expects "body" element to exist in $arr.
1750          *
1751          * @param array $item
1752          * @return string detected language
1753          * @throws \Text_LanguageDetect_Exception
1754          */
1755         private static function getLanguage(array $item)
1756         {
1757                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1758                         return '';
1759                 }
1760
1761                 // Convert attachments to links
1762                 $naked_body = BBCode::removeAttachment($item['body']);
1763                 if (empty($naked_body)) {
1764                         return '';
1765                 }
1766
1767                 // Remove links and pictures
1768                 $naked_body = BBCode::removeLinks($naked_body);
1769
1770                 // Convert the title and the body to plain text
1771                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1772
1773                 // Remove possibly remaining links
1774                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1775
1776                 if (empty($naked_body)) {
1777                         return '';
1778                 }
1779
1780                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1781                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1782                 if (is_array($languages)) {
1783                         return json_encode($languages);
1784                 }
1785
1786                 return '';
1787         }
1788
1789         public static function getLanguageMessage(array $item)
1790         {
1791                 $iso639 = new \Matriphe\ISO639\ISO639;
1792
1793                 $used_languages = '';
1794                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1795                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1796                 }
1797                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1798                 return $used_languages;
1799         }
1800
1801         /**
1802          * Creates an unique guid out of a given uri
1803          *
1804          * @param string $uri uri of an item entry
1805          * @param string $host hostname for the GUID prefix
1806          * @return string unique guid
1807          */
1808         public static function guidFromUri($uri, $host)
1809         {
1810                 // Our regular guid routine is using this kind of prefix as well
1811                 // We have to avoid that different routines could accidentally create the same value
1812                 $parsed = parse_url($uri);
1813
1814                 // We use a hash of the hostname as prefix for the guid
1815                 $guid_prefix = hash("crc32", $host);
1816
1817                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1818                 unset($parsed["scheme"]);
1819
1820                 // Glue it together to be able to make a hash from it
1821                 $host_id = implode("/", $parsed);
1822
1823                 // We could use any hash algorithm since it isn't a security issue
1824                 $host_hash = hash("ripemd128", $host_id);
1825
1826                 return $guid_prefix.$host_hash;
1827         }
1828
1829         /**
1830          * generate an unique URI
1831          *
1832          * @param integer $uid  User id
1833          * @param string  $guid An existing GUID (Otherwise it will be generated)
1834          *
1835          * @return string
1836          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1837          */
1838         public static function newURI($uid, $guid = "")
1839         {
1840                 if ($guid == "") {
1841                         $guid = System::createUUID();
1842                 }
1843
1844                 return DI::baseUrl()->get() . '/objects/' . $guid;
1845         }
1846
1847         /**
1848          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1849          *
1850          * This can be used to filter for inactive contacts.
1851          * Only do this for public postings to avoid privacy problems, since poco data is public.
1852          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1853          *
1854          * @param array $arr Contains the just posted item record
1855          * @throws \Exception
1856          */
1857         private static function updateContact($arr)
1858         {
1859                 // Unarchive the author
1860                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1861                 if (DBA::isResult($contact)) {
1862                         Contact::unmarkForArchival($contact);
1863                 }
1864
1865                 // Unarchive the contact if it's not our own contact
1866                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1867                 if (DBA::isResult($contact)) {
1868                         Contact::unmarkForArchival($contact);
1869                 }
1870
1871                 /// @todo On private posts we could obfuscate the date
1872                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1873
1874                 // Is it a forum? Then we don't care about the rules from above
1875                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri"] === $arr["uri"])) {
1876                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1877                                 $update = true;
1878                         }
1879                 }
1880
1881                 if ($update) {
1882                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1883                         // So we have to ensure to only update the last item when it had been our own post,
1884                         // or it had been done by a "regular" contact.
1885                         if (!empty($arr['wall'])) {
1886                                 $condition = ['id' => $arr['contact-id']];
1887                         } else {
1888                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1889                         }
1890                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1891                 }
1892                 // Now do the same for the system wide contacts with uid=0
1893                 if ($arr['private'] != self::PRIVATE) {
1894                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1895                                 ['id' => $arr['owner-id']]);
1896
1897                         if ($arr['owner-id'] != $arr['author-id']) {
1898                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1899                                         ['id' => $arr['author-id']]);
1900                         }
1901                 }
1902         }
1903
1904         public static function setHashtags($body)
1905         {
1906                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code'], function ($body) {
1907                         $tags = BBCode::getTags($body);
1908
1909                         // No hashtags?
1910                         if (!count($tags)) {
1911                                 return $body;
1912                         }
1913
1914                         // This sorting is important when there are hashtags that are part of other hashtags
1915                         // Otherwise there could be problems with hashtags like #test and #test2
1916                         // Because of this we are sorting from the longest to the shortest tag.
1917                         usort($tags, function ($a, $b) {
1918                                 return strlen($b) <=> strlen($a);
1919                         });
1920
1921                         $URLSearchString = "^\[\]";
1922
1923                         // All hashtags should point to the home server if "local_tags" is activated
1924                         if (DI::config()->get('system', 'local_tags')) {
1925                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1926                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1927                         }
1928
1929                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1930                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1931                                 function ($match) {
1932                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1933                                 }, $body);
1934
1935                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1936                                 function ($match) {
1937                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1938                                 }, $body);
1939
1940                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1941                                 function ($match) {
1942                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1943                                 }, $body);
1944
1945                         // Repair recursive urls
1946                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1947                                 "&num;$2", $body);
1948
1949                         foreach ($tags as $tag) {
1950                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1951                                         continue;
1952                                 }
1953
1954                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1955                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1956
1957                                 $body = str_replace($tag, $newtag, $body);
1958                         }
1959
1960                         // Convert back the masked hashtags
1961                         $body = str_replace("&num;", "#", $body);
1962
1963                         return $body;
1964                 });
1965
1966                 return $body;
1967         }
1968
1969         /**
1970          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1971          *
1972          * @param int $uid
1973          * @param int $item_id
1974          * @return boolean true if item was deleted, else false
1975          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1976          * @throws \ImagickException
1977          */
1978         private static function tagDeliver($uid, $item_id)
1979         {
1980                 $mention = false;
1981
1982                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1983                 if (!DBA::isResult($user)) {
1984                         return false;
1985                 }
1986
1987                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1988                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1989
1990                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1991                 if (!DBA::isResult($item)) {
1992                         return false;
1993                 }
1994
1995                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1996
1997                 /*
1998                  * Diaspora uses their own hardwired link URL in @-tags
1999                  * instead of the one we supply with webfinger
2000                  */
2001                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
2002
2003                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
2004                 if ($cnt) {
2005                         foreach ($matches as $mtch) {
2006                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
2007                                         $mention = true;
2008                                         Logger::log('mention found: ' . $mtch[2]);
2009                                 }
2010                         }
2011                 }
2012
2013                 if (!$mention) {
2014                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
2015                         foreach ($tags as $tag) {
2016                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
2017                                         $mention = true;
2018                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
2019                                 }
2020                         }
2021                 }
2022
2023                 if (!$mention) {
2024                         if (($community_page || $prvgroup) &&
2025                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
2026                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item_id, 'guid'=> $item['guid']]);
2027                                 DBA::delete('item', ['id' => $item_id]);
2028                                 return true;
2029                         }
2030                         return false;
2031                 }
2032
2033                 $arr = ['item' => $item, 'user' => $user];
2034
2035                 Hook::callAll('tagged', $arr);
2036
2037                 if (!$community_page && !$prvgroup) {
2038                         return false;
2039                 }
2040
2041                 /*
2042                  * tgroup delivery - setup a second delivery chain
2043                  * prevent delivery looping - only proceed
2044                  * if the message originated elsewhere and is a top-level post
2045                  */
2046                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
2047                         return false;
2048                 }
2049
2050                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
2051                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
2052                 if (!DBA::isResult($self)) {
2053                         return false;
2054                 }
2055
2056                 $owner_id = Contact::getIdForURL($self['url']);
2057
2058                 // also reset all the privacy bits to the forum default permissions
2059
2060                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
2061
2062                 $psid = PermissionSet::getIdFromACL(
2063                         $user['uid'],
2064                         $user['allow_cid'],
2065                         $user['allow_gid'],
2066                         $user['deny_cid'],
2067                         $user['deny_gid']
2068                 );
2069
2070                 $forum_mode = ($prvgroup ? 2 : 1);
2071
2072                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
2073                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
2074                 self::update($fields, ['id' => $item_id]);
2075
2076                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, $item_id);
2077
2078                 self::performActivity($item_id, 'announce', $uid);
2079
2080                 return false;
2081         }
2082
2083         /**
2084          * Automatically reshare the item if the "remote_self" option is selected
2085          *
2086          * @param array $item
2087          * @return void
2088          */
2089         private static function autoReshare(array $item)
2090         {
2091                 if ($item['gravity'] != GRAVITY_PARENT) {
2092                         return;
2093                 }
2094
2095                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
2096                         return;
2097                 }
2098
2099                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
2100                         return;
2101                 }
2102
2103                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
2104
2105                 self::performActivity($item['id'], 'announce', $item['uid']);
2106         }
2107
2108         public static function isRemoteSelf($contact, &$datarray)
2109         {
2110                 if (!$contact['remote_self']) {
2111                         return false;
2112                 }
2113
2114                 // Prevent the forwarding of posts that are forwarded
2115                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
2116                         Logger::info('Already forwarded');
2117                         return false;
2118                 }
2119
2120                 // Prevent to forward already forwarded posts
2121                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
2122                         Logger::info('Already forwarded (second test)');
2123                         return false;
2124                 }
2125
2126                 // Only forward posts
2127                 if ($datarray["verb"] != Activity::POST) {
2128                         Logger::info('No post');
2129                         return false;
2130                 }
2131
2132                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
2133                         Logger::info('Not public');
2134                         return false;
2135                 }
2136
2137                 $datarray2 = $datarray;
2138                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
2139                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
2140                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
2141                                         ['uid' => $contact['uid'], 'self' => true]);
2142                         if (DBA::isResult($self)) {
2143                                 $datarray['contact-id'] = $self["id"];
2144
2145                                 $datarray['owner-name'] = $self["name"];
2146                                 $datarray['owner-link'] = $self["url"];
2147                                 $datarray['owner-avatar'] = $self["thumb"];
2148
2149                                 $datarray['author-name']   = $datarray['owner-name'];
2150                                 $datarray['author-link']   = $datarray['owner-link'];
2151                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
2152
2153                                 unset($datarray['edited']);
2154
2155                                 unset($datarray['network']);
2156                                 unset($datarray['owner-id']);
2157                                 unset($datarray['author-id']);
2158                         }
2159
2160                         if ($contact['network'] != Protocol::FEED) {
2161                                 $old_uri_id = $datarray["uri-id"] ?? 0;
2162                                 $datarray["guid"] = System::createUUID();
2163                                 unset($datarray["plink"]);
2164                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
2165                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
2166                                 $datarray["extid"] = Protocol::DFRN;
2167                                 $urlpart = parse_url($datarray2['author-link']);
2168                                 $datarray["app"] = $urlpart["host"];
2169                                 if (!empty($old_uri_id)) {
2170                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
2171                                 }
2172
2173                                 unset($datarray["parent-uri"]);
2174                                 unset($datarray["thr-parent"]);
2175                         } else {
2176                                 $datarray['private'] = self::PUBLIC;
2177                         }
2178                 }
2179
2180                 if ($contact['network'] != Protocol::FEED) {
2181                         // Store the original post
2182                         $result = self::insert($datarray2);
2183                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
2184                 } else {
2185                         $datarray["app"] = "Feed";
2186                         $result = true;
2187                 }
2188
2189                 // Trigger automatic reactions for addons
2190                 $datarray['api_source'] = true;
2191
2192                 // We have to tell the hooks who we are - this really should be improved
2193                 $_SESSION['authenticated'] = true;
2194                 $_SESSION['uid'] = $contact['uid'];
2195
2196                 return (bool)$result;
2197         }
2198
2199         /**
2200          *
2201          * @param string $s
2202          * @param int    $uid
2203          * @param array  $item
2204          * @param int    $cid
2205          * @return string
2206          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2207          * @throws \ImagickException
2208          */
2209         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
2210         {
2211                 if (DI::config()->get('system', 'disable_embedded')) {
2212                         return $s;
2213                 }
2214
2215                 Logger::info('check for photos');
2216                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
2217
2218                 $orig_body = $s;
2219                 $new_body = '';
2220
2221                 $img_start = strpos($orig_body, '[img');
2222                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2223                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2224
2225                 while (($img_st_close !== false) && ($img_len !== false)) {
2226                         $img_st_close++; // make it point to AFTER the closing bracket
2227                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
2228
2229                         Logger::info('found photo', ['image' => $image]);
2230
2231                         if (stristr($image, $site . '/photo/')) {
2232                                 // Only embed locally hosted photos
2233                                 $replace = false;
2234                                 $i = basename($image);
2235                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
2236                                 $x = strpos($i, '-');
2237
2238                                 if ($x) {
2239                                         $res = substr($i, $x + 1);
2240                                         $i = substr($i, 0, $x);
2241                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2242                                         if (DBA::isResult($photo)) {
2243                                                 /*
2244                                                  * Check to see if we should replace this photo link with an embedded image
2245                                                  * 1. No need to do so if the photo is public
2246                                                  * 2. If there's a contact-id provided, see if they're in the access list
2247                                                  *    for the photo. If so, embed it.
2248                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2249                                                  *    permissions, regardless of order but first check to see if they're an exact
2250                                                  *    match to save some processing overhead.
2251                                                  */
2252                                                 if (self::hasPermissions($photo)) {
2253                                                         if ($cid) {
2254                                                                 $recips = self::enumeratePermissions($photo);
2255                                                                 if (in_array($cid, $recips)) {
2256                                                                         $replace = true;
2257                                                                 }
2258                                                         } elseif ($item) {
2259                                                                 if (self::samePermissions($uid, $item, $photo)) {
2260                                                                         $replace = true;
2261                                                                 }
2262                                                         }
2263                                                 }
2264                                                 if ($replace) {
2265                                                         $photo_img = Photo::getImageForPhoto($photo);
2266                                                         // If a custom width and height were specified, apply before embedding
2267                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2268                                                                 Logger::info('scaling photo');
2269
2270                                                                 $width = intval($match[1]);
2271                                                                 $height = intval($match[2]);
2272
2273                                                                 $photo_img->scaleDown(max($width, $height));
2274                                                         }
2275
2276                                                         $data = $photo_img->asString();
2277                                                         $type = $photo_img->getType();
2278
2279                                                         Logger::info('replacing photo');
2280                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2281                                                         Logger::debug('replaced', ['image' => $image]);
2282                                                 }
2283                                         }
2284                                 }
2285                         }
2286
2287                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2288                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2289                         if ($orig_body === false) {
2290                                 $orig_body = '';
2291                         }
2292
2293                         $img_start = strpos($orig_body, '[img');
2294                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2295                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2296                 }
2297
2298                 $new_body = $new_body . $orig_body;
2299
2300                 return $new_body;
2301         }
2302
2303         private static function hasPermissions($obj)
2304         {
2305                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2306                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2307         }
2308
2309         private static function samePermissions($uid, $obj1, $obj2)
2310         {
2311                 // first part is easy. Check that these are exactly the same.
2312                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2313                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2314                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2315                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2316                         return true;
2317                 }
2318
2319                 // This is harder. Parse all the permissions and compare the resulting set.
2320                 $recipients1 = self::enumeratePermissions($obj1);
2321                 $recipients2 = self::enumeratePermissions($obj2);
2322                 sort($recipients1);
2323                 sort($recipients2);
2324
2325                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2326                 return ($recipients1 == $recipients2);
2327         }
2328
2329         /**
2330          * Returns an array of contact-ids that are allowed to see this object
2331          *
2332          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2333          * @param bool  $check_dead Prunes unavailable contacts from the result
2334          * @return array
2335          * @throws \Exception
2336          */
2337         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2338         {
2339                 $aclFormater = DI::aclFormatter();
2340
2341                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2342                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2343                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2344                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2345                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2346                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2347                 $recipients   = array_diff($recipients, $deny);
2348                 return $recipients;
2349         }
2350
2351         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2352         {
2353                 if (!$uid || ($days < 1)) {
2354                         return;
2355                 }
2356
2357                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2358                         $uid, GRAVITY_PARENT];
2359
2360                 /*
2361                  * $expire_network_only = save your own wall posts
2362                  * and just expire conversations started by others
2363                  */
2364                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2365
2366                 if ($expire_network_only) {
2367                         $condition[0] .= " AND NOT `wall`";
2368                 }
2369
2370                 if ($network != "") {
2371                         $condition[0] .= " AND `network` = ?";
2372                         $condition[] = $network;
2373                 }
2374
2375                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2376                 $condition[] = $days;
2377
2378                 $items = Post::select(['file', 'resource-id', 'starred', 'type', 'id', 'post-type'], $condition);
2379
2380                 if (!DBA::isResult($items)) {
2381                         return;
2382                 }
2383
2384                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2385
2386                 // Forcing expiring of items - but not notes and marked items
2387                 if ($force) {
2388                         $expire_items = true;
2389                 }
2390
2391                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2392                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2393                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2394
2395                 $expired = 0;
2396
2397                 $priority = DI::config()->get('system', 'expire-notify-priority');
2398
2399                 while ($item = Post::fetch($items)) {
2400                         // don't expire filed items
2401
2402                         if (strpos($item['file'], '[') !== false) {
2403                                 continue;
2404                         }
2405
2406                         // Only expire posts, not photos and photo comments
2407
2408                         if (!$expire_photos && strlen($item['resource-id'])) {
2409                                 continue;
2410                         } elseif (!$expire_starred && intval($item['starred'])) {
2411                                 continue;
2412                         } elseif (!$expire_notes && (($item['type'] == 'note') || ($item['post-type'] == self::PT_PERSONAL_NOTE))) {
2413                                 continue;
2414                         } elseif (!$expire_items && ($item['type'] != 'note') && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2415                                 continue;
2416                         }
2417
2418                         self::markForDeletionById($item['id'], $priority);
2419
2420                         ++$expired;
2421                 }
2422                 DBA::close($items);
2423                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2424         }
2425
2426         public static function firstPostDate($uid, $wall = false)
2427         {
2428                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
2429                 $params = ['order' => ['received' => false]];
2430                 $thread = DBA::selectFirst('thread', ['received'], $condition, $params);
2431                 if (DBA::isResult($thread)) {
2432                         return substr(DateTimeFormat::local($thread['received']), 0, 10);
2433                 }
2434                 return false;
2435         }
2436
2437         /**
2438          * add/remove activity to an item
2439          *
2440          * Toggle activities as like,dislike,attend of an item
2441          *
2442          * @param int $item_id
2443          * @param string $verb
2444          *            Activity verb. One of
2445          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2446          *            attendno, unattendno, attendmaybe, unattendmaybe,
2447          *            announce, unannouce
2448          * @return bool
2449          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2450          * @throws \ImagickException
2451          * @hook  'post_local_end'
2452          *            array $arr
2453          *            'post_id' => ID of posted item
2454          */
2455         public static function performActivity(int $item_id, string $verb, int $uid)
2456         {
2457                 if (empty($uid)) {
2458                         return false;
2459                 }
2460
2461                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2462
2463                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2464                 if (!DBA::isResult($item)) {
2465                         Logger::log('like: unknown item ' . $item_id);
2466                         return false;
2467                 }
2468
2469                 $item_uri = $item['uri'];
2470
2471                 if (!in_array($item['uid'], [0, $uid])) {
2472                         return false;
2473                 }
2474
2475                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2476                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2477                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2478                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2479                                 if (!DBA::isResult($item)) {
2480                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'item-uri' => $item_uri]);
2481                                         return false;
2482                                 }
2483                         }
2484                 }
2485
2486                 // Retrieves the local post owner
2487                 $owner = User::getOwnerDataById($uid);
2488                 if (empty($owner)) {
2489                         Logger::info('Empty owner for user', ['uid' => $uid]);
2490                         return false;
2491                 }
2492
2493                 // Retrieve the current logged in user's public contact
2494                 $author_id = Contact::getIdForURL($owner['url']);
2495                 if (empty($author_id)) {
2496                         Logger::info('Empty public contact');
2497                         return false;
2498                 }
2499
2500                 $activity = null;
2501                 switch ($verb) {
2502                         case 'like':
2503                         case 'unlike':
2504                                 $activity = Activity::LIKE;
2505                                 break;
2506                         case 'dislike':
2507                         case 'undislike':
2508                                 $activity = Activity::DISLIKE;
2509                                 break;
2510                         case 'attendyes':
2511                         case 'unattendyes':
2512                                 $activity = Activity::ATTEND;
2513                                 break;
2514                         case 'attendno':
2515                         case 'unattendno':
2516                                 $activity = Activity::ATTENDNO;
2517                                 break;
2518                         case 'attendmaybe':
2519                         case 'unattendmaybe':
2520                                 $activity = Activity::ATTENDMAYBE;
2521                                 break;
2522                         case 'follow':
2523                         case 'unfollow':
2524                                 $activity = Activity::FOLLOW;
2525                                 break;
2526                         case 'announce':
2527                         case 'unannounce':
2528                                 $activity = Activity::ANNOUNCE;
2529                                 break;
2530                         default:
2531                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2532                                 return false;
2533                 }
2534
2535                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2536
2537                 // Enable activity toggling instead of on/off
2538                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2539
2540                 // Look for an existing verb row
2541                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2542                 if ($event_verb_flag) {
2543                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2544
2545                         // Translate to the index based activity index
2546                         $vids = [];
2547                         foreach ($verbs as $verb) {
2548                                 $vids[] = Verb::getID($verb);
2549                         }
2550                 } else {
2551                         $vids = Verb::getID($activity);
2552                 }
2553
2554                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2555                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent' => $item_uri];
2556                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2557
2558                 if (DBA::isResult($like_item)) {
2559                         /**
2560                          * Truth table for existing activities
2561                          *
2562                          * |          Inputs            ||      Outputs      |
2563                          * |----------------------------||-------------------|
2564                          * |  Mode  | Event | Same verb || Delete? | Return? |
2565                          * |--------|-------|-----------||---------|---------|
2566                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2567                          * | create |  Yes  |    No     ||   Yes   |   No    |
2568                          * | create |  No   |    Yes    ||   No    |   Yes   |
2569                          * | create |  No   |    No     ||        N/A†       |
2570                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2571                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2572                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2573                          * | delete |  No   |    No     ||        N/A†       |
2574                          * |--------|-------|-----------||---------|---------|
2575                          * |   A    |   B   |     C     || A xor C | !B or C |
2576                          *
2577                          * † Can't happen: It's impossible to find an existing non-event activity without
2578                          *                 the same verb because we are only looking for this single verb.
2579                          *
2580                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2581                          */
2582                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2583                                 self::markForDeletionById($like_item['id']);
2584                         }
2585
2586                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2587                                 return true;
2588                         }
2589                 }
2590
2591                 // No need to go further if we aren't creating anything
2592                 if ($mode == 'delete') {
2593                         return true;
2594                 }
2595
2596                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2597
2598                 $new_item = [
2599                         'guid'          => System::createUUID(),
2600                         'uri'           => self::newURI($item['uid']),
2601                         'uid'           => $item['uid'],
2602                         'contact-id'    => $owner['id'],
2603                         'wall'          => $item['wall'],
2604                         'origin'        => 1,
2605                         'network'       => Protocol::DFRN,
2606                         'protocol'      => Conversation::PARCEL_DIRECT,
2607                         'direction'     => Conversation::PUSH,
2608                         'gravity'       => GRAVITY_ACTIVITY,
2609                         'parent'        => $item['id'],
2610                         'thr-parent'    => $item['uri'],
2611                         'owner-id'      => $author_id,
2612                         'author-id'     => $author_id,
2613                         'body'          => $activity,
2614                         'verb'          => $activity,
2615                         'object-type'   => $objtype,
2616                         'allow_cid'     => $item['allow_cid'],
2617                         'allow_gid'     => $item['allow_gid'],
2618                         'deny_cid'      => $item['deny_cid'],
2619                         'deny_gid'      => $item['deny_gid'],
2620                         'visible'       => 1,
2621                         'unseen'        => 1,
2622                 ];
2623
2624                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2625                 if (!empty($signed)) {
2626                         $new_item['diaspora_signed_text'] = json_encode($signed);
2627                 }
2628
2629                 $new_item_id = self::insert($new_item);
2630
2631                 // If the parent item isn't visible then set it to visible
2632                 if (!$item['visible']) {
2633                         self::update(['visible' => true], ['id' => $item['id']]);
2634                 }
2635
2636                 $new_item['id'] = $new_item_id;
2637
2638                 Hook::callAll('post_local_end', $new_item);
2639
2640                 return true;
2641         }
2642
2643         private static function addThread($itemid, $onlyshadow = false)
2644         {
2645                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2646                         'moderated', 'visible', 'starred', 'contact-id', 'post-type', 'uri-id',
2647                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2648                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2649                 $item = Post::selectFirst($fields, $condition);
2650
2651                 if (!DBA::isResult($item)) {
2652                         return;
2653                 }
2654
2655                 $item['iid'] = $itemid;
2656
2657                 if (!$onlyshadow) {
2658                         $result = DBA::replace('thread', $item);
2659
2660                         Logger::info('Add thread', ['item' => $itemid, 'result' => $result]);
2661                 }
2662         }
2663
2664         private static function updateThread($itemid, $setmention = false)
2665         {
2666                 $fields = ['uid', 'guid', 'created', 'edited', 'commented', 'received', 'changed', 'post-type',
2667                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'starred', 'contact-id', 'uri-id',
2668                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id'];
2669
2670                 $item = Post::selectFirst($fields, ['id' => $itemid, 'gravity' => GRAVITY_PARENT]);
2671                 if (!DBA::isResult($item)) {
2672                         return;
2673                 }
2674
2675                 if ($setmention) {
2676                         $item["mention"] = 1;
2677                 }
2678
2679                 $fields = [];
2680
2681                 foreach ($item as $field => $data) {
2682                         if (!in_array($field, ["guid"])) {
2683                                 $fields[$field] = $data;
2684                         }
2685                 }
2686
2687                 $result = DBA::update('thread', $fields, ['iid' => $itemid]);
2688
2689                 Logger::info('Update thread', ['item' => $itemid, 'guid' => $item["guid"], 'result' => $result]);
2690         }
2691
2692         private static function deleteThread($itemid, $itemuri = "")
2693         {
2694                 $item = DBA::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2695                 if (!DBA::isResult($item)) {
2696                         Logger::info('No thread found', ['id' => $itemid]);
2697                         return;
2698                 }
2699
2700                 $result = DBA::delete('thread', ['iid' => $itemid], ['cascade' => false]);
2701
2702                 Logger::info('Deleted thread', ['item' => $itemid, 'result' => $result]);
2703
2704                 if ($itemuri != "") {
2705                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
2706                         if (!Post::exists($condition)) {
2707                                 DBA::delete('item', ['uri' => $itemuri, 'uid' => 0]);
2708                                 Logger::debug('Deleted shadow item', ['id' => $itemid, 'uri' => $itemuri]);
2709                         }
2710                 }
2711         }
2712
2713         /**
2714          * Fetch the SQL condition for the given user id
2715          *
2716          * @param integer $owner_id User ID for which the permissions should be fetched
2717          * @return array condition
2718          */
2719         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2720         {
2721                 $local_user = local_user();
2722                 $remote_user = Session::getRemoteContactID($owner_id);
2723
2724                 // default permissions - anonymous user
2725                 $condition = ["`private` != ?", self::PRIVATE];
2726
2727                 if ($local_user && ($local_user == $owner_id)) {
2728                         // Profile owner - everything is visible
2729                         $condition = [];
2730                 } elseif ($remote_user) {
2731                          // Authenticated visitor - fetch the matching permissionsets
2732                         $set = PermissionSet::get($owner_id, $remote_user);
2733                         if (!empty($set)) {
2734                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2735                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2736                                         self::PRIVATE, self::PRIVATE];
2737                                 $condition = array_merge($condition, $set);
2738                         }
2739                 }
2740
2741                 return $condition;
2742         }
2743
2744         /**
2745          * Get a permission SQL string for the given user
2746          *
2747          * @param int $owner_id
2748          * @param string $table
2749          * @return string
2750          */
2751         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2752         {
2753                 $local_user = local_user();
2754                 $remote_user = Session::getRemoteContactID($owner_id);
2755
2756                 if (!empty($table)) {
2757                         $table = DBA::quoteIdentifier($table) . '.';
2758                 }
2759
2760                 /*
2761                  * Construct permissions
2762                  *
2763                  * default permissions - anonymous user
2764                  */
2765                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2766
2767                 // Profile owner - everything is visible
2768                 if ($local_user && ($local_user == $owner_id)) {
2769                         $sql = '';
2770                 } elseif ($remote_user) {
2771                         /*
2772                          * Authenticated visitor. Unless pre-verified,
2773                          * check that the contact belongs to this $owner_id
2774                          * and load the groups the visitor belongs to.
2775                          * If pre-verified, the caller is expected to have already
2776                          * done this and passed the groups into this function.
2777                          */
2778                         $set = PermissionSet::get($owner_id, $remote_user);
2779
2780                         if (!empty($set)) {
2781                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2782                         } else {
2783                                 $sql_set = '';
2784                         }
2785
2786                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2787                 }
2788
2789                 return $sql;
2790         }
2791
2792         /**
2793          * get translated item type
2794          *
2795          * @param $item
2796          * @return string
2797          */
2798         public static function postType($item)
2799         {
2800                 if (!empty($item['event-id'])) {
2801                         return DI::l10n()->t('event');
2802                 } elseif (!empty($item['resource-id'])) {
2803                         return DI::l10n()->t('photo');
2804                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2805                         return DI::l10n()->t('activity');
2806                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2807                         return DI::l10n()->t('comment');
2808                 }
2809
2810                 return DI::l10n()->t('post');
2811         }
2812
2813         /**
2814          * Sets the "rendered-html" field of the provided item
2815          *
2816          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2817          *
2818          * @param array $item
2819          * @param bool  $update
2820          *
2821          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2822          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2823          */
2824         public static function putInCache(&$item, $update = false)
2825         {
2826                 // Save original body to prevent addons to modify it
2827                 $body = $item['body'];
2828
2829                 $rendered_hash = $item['rendered-hash'] ?? '';
2830                 $rendered_html = $item['rendered-html'] ?? '';
2831
2832                 if ($rendered_hash == ''
2833                         || $rendered_html == ''
2834                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2835                         || DI::config()->get('system', 'ignore_cache')
2836                 ) {
2837                         self::addRedirToImageTags($item);
2838
2839                         $item['rendered-html'] = BBCode::convert($item['body']);
2840                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2841
2842                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2843                         Hook::callAll('put_item_in_cache', $hook_data);
2844                         $item['rendered-html'] = $hook_data['rendered-html'];
2845                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2846                         unset($hook_data);
2847
2848                         // Force an update if the generated values differ from the existing ones
2849                         if ($rendered_hash != $item['rendered-hash']) {
2850                                 $update = true;
2851                         }
2852
2853                         // Only compare the HTML when we forcefully ignore the cache
2854                         if (DI::config()->get('system', 'ignore_cache') && ($rendered_html != $item['rendered-html'])) {
2855                                 $update = true;
2856                         }
2857
2858                         if ($update && !empty($item['id'])) {
2859                                 self::update(
2860                                         [
2861                                                 'rendered-html' => $item['rendered-html'],
2862                                                 'rendered-hash' => $item['rendered-hash']
2863                                         ],
2864                                         ['id' => $item['id']]
2865                                 );
2866                         }
2867                 }
2868
2869                 $item['body'] = $body;
2870         }
2871
2872         /**
2873          * Find any non-embedded images in private items and add redir links to them
2874          *
2875          * @param array &$item The field array of an item row
2876          */
2877         private static function addRedirToImageTags(array &$item)
2878         {
2879                 $app = DI::app();
2880
2881                 $matches = [];
2882                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2883                 if ($cnt) {
2884                         foreach ($matches as $mtch) {
2885                                 if (strpos($mtch[1], '/redir') !== false) {
2886                                         continue;
2887                                 }
2888
2889                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2890                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2891                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2892                                 }
2893                         }
2894                 }
2895         }
2896
2897         /**
2898          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2899          * If attach is true, also add icons for item attachments.
2900          *
2901          * @param array   $item
2902          * @param boolean $attach
2903          * @param boolean $is_preview
2904          * @return string item body html
2905          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2906          * @throws \ImagickException
2907          * @hook  prepare_body_init item array before any work
2908          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2909          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2910          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2911          */
2912         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2913         {
2914                 $a = DI::app();
2915                 Hook::callAll('prepare_body_init', $item);
2916
2917                 // In order to provide theme developers more possibilities, event items
2918                 // are treated differently.
2919                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2920                         $ev = Event::getItemHTML($item);
2921                         return $ev;
2922                 }
2923
2924                 $tags = Tag::populateFromItem($item);
2925
2926                 $item['tags'] = $tags['tags'];
2927                 $item['hashtags'] = $tags['hashtags'];
2928                 $item['mentions'] = $tags['mentions'];
2929
2930                 // Compile eventual content filter reasons
2931                 $filter_reasons = [];
2932                 if (!$is_preview && public_contact() != $item['author-id']) {
2933                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2934                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2935                         }
2936
2937                         $hook_data = [
2938                                 'item' => $item,
2939                                 'filter_reasons' => $filter_reasons
2940                         ];
2941                         Hook::callAll('prepare_body_content_filter', $hook_data);
2942                         $filter_reasons = $hook_data['filter_reasons'];
2943                         unset($hook_data);
2944                 }
2945
2946                 // Update the cached values if there is no "zrl=..." on the links.
2947                 $update = (!Session::isAuthenticated() && ($item["uid"] == 0));
2948
2949                 // Or update it if the current viewer is the intented viewer.
2950                 if (($item["uid"] == local_user()) && ($item["uid"] != 0)) {
2951                         $update = true;
2952                 }
2953
2954                 self::putInCache($item, $update);
2955                 $s = $item["rendered-html"];
2956
2957                 $hook_data = [
2958                         'item' => $item,
2959                         'html' => $s,
2960                         'preview' => $is_preview,
2961                         'filter_reasons' => $filter_reasons
2962                 ];
2963                 Hook::callAll('prepare_body', $hook_data);
2964                 $s = $hook_data['html'];
2965                 unset($hook_data);
2966
2967                 if (!$attach) {
2968                         // Replace the blockquotes with quotes that are used in mails.
2969                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2970                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2971                         return $s;
2972                 }
2973
2974                 $as = '';
2975                 $vhead = false;
2976                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2977                         $mime = $attachment['mimetype'];
2978
2979                         $the_url = Contact::magicLinkById($item['author-id'], $attachment['url']);
2980
2981                         if (strpos($mime, 'video') !== false) {
2982                                 if (!$vhead) {
2983                                         $vhead = true;
2984                                         DI::page()['htmlhead'] .= Renderer::replaceMacros(Renderer::getMarkupTemplate('videos_head.tpl'));
2985                                 }
2986
2987                                 $as .= Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2988                                         '$video' => [
2989                                                 'id'     => $item['author-id'],
2990                                                 'title'  => DI::l10n()->t('View Video'),
2991                                                 'src'    => $the_url,
2992                                                 'mime'   => $mime,
2993                                         ],
2994                                 ]);
2995                         }
2996
2997                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2998                         if ($filetype) {
2999                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
3000                                 $filesubtype = str_replace('.', '-', $filesubtype);
3001                         } else {
3002                                 $filetype = 'unkn';
3003                                 $filesubtype = 'unkn';
3004                         }
3005
3006                         $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
3007                         $title .= ' ' . ($attachment['size'] ?? 0) . ' ' . DI::l10n()->t('bytes');
3008
3009                         $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
3010                         $as .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
3011                 }
3012
3013                 if ($as != '') {
3014                         $s .= '<div class="body-attach">'.$as.'<div class="clear"></div></div>';
3015                 }
3016
3017                 // Map.
3018                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
3019                         $x = Map::byCoordinates(trim($item['coord']));
3020                         if ($x) {
3021                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
3022                         }
3023                 }
3024
3025                 // Replace friendica image url size with theme preference.
3026                 if (!empty($a->theme_info['item_image_size'])) {
3027                         $ps = $a->theme_info['item_image_size'];
3028                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
3029                 }
3030
3031                 $s = HTML::applyContentFilter($s, $filter_reasons);
3032
3033                 $hook_data = ['item' => $item, 'html' => $s];
3034                 Hook::callAll('prepare_body_final', $hook_data);
3035
3036                 return $hook_data['html'];
3037         }
3038
3039         /**
3040          * get private link for item
3041          *
3042          * @param array $item
3043          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
3044          * @throws \Exception
3045          */
3046         public static function getPlink($item)
3047         {
3048                 if (local_user()) {
3049                         $ret = [
3050                                 'href' => "display/" . $item['guid'],
3051                                 'orig' => "display/" . $item['guid'],
3052                                 'title' => DI::l10n()->t('View on separate page'),
3053                                 'orig_title' => DI::l10n()->t('view on separate page'),
3054                         ];
3055
3056                         if (!empty($item['plink'])) {
3057                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
3058                                 $ret["title"] = DI::l10n()->t('link to source');
3059                         }
3060                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
3061                         $ret = [
3062                                 'href' => $item['plink'],
3063                                 'orig' => $item['plink'],
3064                                 'title' => DI::l10n()->t('link to source'),
3065                         ];
3066                 } else {
3067                         $ret = [];
3068                 }
3069
3070                 return $ret;
3071         }
3072
3073         /**
3074          * Is the given item array a post that is sent as starting post to a forum?
3075          *
3076          * @param array $item
3077          * @param array $owner
3078          *
3079          * @return boolean "true" when it is a forum post
3080          */
3081         public static function isForumPost(array $item, array $owner = [])
3082         {
3083                 if (empty($owner)) {
3084                         $owner = User::getOwnerDataById($item['uid']);
3085                         if (empty($owner)) {
3086                                 return false;
3087                         }
3088                 }
3089
3090                 if (($item['author-id'] == $item['owner-id']) ||
3091                         ($owner['id'] == $item['contact-id']) ||
3092                         ($item['uri'] != $item['parent-uri']) ||
3093                         $item['origin']) {
3094                         return false;
3095                 }
3096
3097                 return Contact::isForum($item['contact-id']);
3098         }
3099
3100         /**
3101          * Search item id for given URI or plink
3102          *
3103          * @param string $uri
3104          * @param integer $uid
3105          *
3106          * @return integer item id
3107          */
3108         public static function searchByLink($uri, $uid = 0)
3109         {
3110                 $ssl_uri = str_replace('http://', 'https://', $uri);
3111                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3112
3113                 $item = DBA::selectFirst('item', ['id'], ['uri' => $uris, 'uid' => $uid]);
3114                 if (DBA::isResult($item)) {
3115                         return $item['id'];
3116                 }
3117
3118                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3119                 if (!DBA::isResult($itemcontent)) {
3120                         return 0;
3121                 }
3122
3123                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3124                 if (!DBA::isResult($itemuri)) {
3125                         return 0;
3126                 }
3127
3128                 $item = DBA::selectFirst('item', ['id'], ['uri' => $itemuri['uri'], 'uid' => $uid]);
3129                 if (DBA::isResult($item)) {
3130                         return $item['id'];
3131                 }
3132
3133                 return 0;
3134         }
3135
3136         /**
3137          * Return the URI for a link to the post
3138          *
3139          * @param string $uri URI or link to post
3140          *
3141          * @return string URI
3142          */
3143         public static function getURIByLink(string $uri)
3144         {
3145                 $ssl_uri = str_replace('http://', 'https://', $uri);
3146                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
3147
3148                 $item = DBA::selectFirst('item', ['uri'], ['uri' => $uris]);
3149                 if (DBA::isResult($item)) {
3150                         return $item['uri'];
3151                 }
3152
3153                 $itemcontent = DBA::selectFirst('item-content', ['uri-id'], ['plink' => $uris]);
3154                 if (!DBA::isResult($itemcontent)) {
3155                         return '';
3156                 }
3157
3158                 $itemuri = DBA::selectFirst('item-uri', ['uri'], ['id' => $itemcontent['uri-id']]);
3159                 if (DBA::isResult($itemuri)) {
3160                         return $itemuri['uri'];
3161                 }
3162
3163                 return '';
3164         }
3165
3166         /**
3167          * Fetches item for given URI or plink
3168          *
3169          * @param string $uri
3170          * @param integer $uid
3171          *
3172          * @return integer item id
3173          */
3174         public static function fetchByLink(string $uri, int $uid = 0)
3175         {
3176                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
3177                 $item_id = self::searchByLink($uri, $uid);
3178                 if (!empty($item_id)) {
3179                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3180                         return $item_id;
3181                 }
3182
3183                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
3184                         $item_id = self::searchByLink($fetched_uri, $uid);
3185                 } else {
3186                         $item_id = Diaspora::fetchByURL($uri);
3187                 }
3188
3189                 if (!empty($item_id)) {
3190                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
3191                         return $item_id;
3192                 }
3193
3194                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
3195                 return 0;
3196         }
3197
3198         /**
3199          * Return share data from an item array (if the item is shared item)
3200          * We are providing the complete Item array, because at some time in the future
3201          * we hopefully will define these values not in the body anymore but in some item fields.
3202          * This function is meant to replace all similar functions in the system.
3203          *
3204          * @param array $item
3205          *
3206          * @return array with share information
3207          */
3208         public static function getShareArray($item)
3209         {
3210                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
3211                         return [];
3212                 }
3213
3214                 $attribute_string = $matches[2];
3215                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
3216                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
3217                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
3218                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
3219                         }
3220                 }
3221                 return $attributes;
3222         }
3223
3224         /**
3225          * Fetch item information for shared items from the original items and adds it.
3226          *
3227          * @param array $item
3228          *
3229          * @return array item array with data from the original item
3230          */
3231         public static function addShareDataFromOriginal(array $item)
3232         {
3233                 $shared = self::getShareArray($item);
3234                 if (empty($shared)) {
3235                         return $item;
3236                 }
3237
3238                 // Real reshares always have got a GUID.
3239                 if (empty($shared['guid'])) {
3240                         return $item;
3241                 }
3242
3243                 $uid = $item['uid'] ?? 0;
3244
3245                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
3246                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
3247                 if (!DBA::isResult($shared_item)) {
3248                         if (empty($shared['link'])) {
3249                                 return $item;
3250                         }
3251
3252                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
3253                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
3254                         if (empty($id)) {
3255                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
3256                                 return $item;
3257                         }
3258
3259                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
3260                         if (!DBA::isResult($shared_item)) {
3261                                 return $item;
3262                         }
3263                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
3264                 } else {
3265                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
3266                 }
3267
3268                 if (!empty($shared_item['title'])) {
3269                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
3270                         unset($shared_item['title']);
3271                 } else {
3272                         $body = $shared_item['body'];
3273                 }
3274
3275                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
3276                 unset($shared_item['body']);
3277
3278                 return array_merge($item, $shared_item);
3279         }
3280
3281         /**
3282          * Check a prospective item array against user-level permissions
3283          *
3284          * @param array $item Expected keys: uri, gravity, and
3285          *                    author-link if is author-id is set,
3286          *                    owner-link if is owner-id is set,
3287          *                    causer-link if is causer-id is set.
3288          * @param int   $user_id Local user ID
3289          * @return bool
3290          * @throws \Exception
3291          */
3292         protected static function isAllowedByUser(array $item, int $user_id)
3293         {
3294                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3295                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3296                         return false;
3297                 }
3298
3299                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3300                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3301                         return false;
3302                 }
3303
3304                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3305                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3306                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3307                         return false;
3308                 }
3309
3310                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3311                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3312                         return false;
3313                 }
3314
3315                 return true;
3316         }
3317 }