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