src/Model/Item.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model;
  23
  24 use Friendica\Content\Text\BBCode;
  25 use Friendica\Content\Text\HTML;
  26 use Friendica\Core\Hook;
  27 use Friendica\Core\Logger;
  28 use Friendica\Core\Protocol;
  29 use Friendica\Core\Renderer;
  30 use Friendica\Core\Session;
  31 use Friendica\Core\System;
  32 use Friendica\Model\Tag;
  33 use Friendica\Core\Worker;
  34 use Friendica\Database\DBA;
  35 use Friendica\DI;
  36 use Friendica\Model\Post;
  37 use Friendica\Protocol\Activity;
  38 use Friendica\Protocol\ActivityPub;
  39 use Friendica\Protocol\Diaspora;
  40 use Friendica\Util\DateTimeFormat;
  41 use Friendica\Util\Map;
  42 use Friendica\Util\Network;
  43 use Friendica\Util\Strings;
  44 use Friendica\Worker\Delivery;
  45 use LanguageDetection\Language;
  46
  47 class Item
  48 {
  49         // Posting types, inspired by https://www.w3.org/TR/activitystreams-vocabulary/#object-types
  50         const PT_ARTICLE = 0;
  51         const PT_NOTE = 1;
  52         const PT_PAGE = 2;
  53         const PT_IMAGE = 16;
  54         const PT_AUDIO = 17;
  55         const PT_VIDEO = 18;
  56         const PT_DOCUMENT = 19;
  57         const PT_EVENT = 32;
  58         const PT_PERSONAL_NOTE = 128;
  59
  60         // Posting reasons (Why had a post been stored for a user?)
  61         const PR_NONE = 0;
  62         const PR_TAG = 64;
  63         const PR_TO = 65;
  64         const PR_CC = 66;
  65         const PR_BTO = 67;
  66         const PR_BCC = 68;
  67         const PR_FOLLOWER = 69;
  68         const PR_ANNOUNCEMENT = 70;
  69         const PR_COMMENT = 71;
  70         const PR_STORED = 72;
  71         const PR_GLOBAL = 73;
  72         const PR_RELAY = 74;
  73         const PR_FETCHED = 75;
  74
  75         // Field list that is used to display the items
  76         const DISPLAY_FIELDLIST = [
  77                 'uid', 'id', 'parent', 'guid', 'network', 'gravity',
  78                 'uri-id', 'uri', 'thr-parent-id', 'thr-parent', 'parent-uri-id', 'parent-uri',
  79                 'commented', 'created', 'edited', 'received', 'verb', 'object-type', 'postopts', 'plink',
  80                 'wall', 'private', 'starred', 'origin', 'parent-origin', 'title', 'body', 'language',
  81                 'content-warning', 'location', 'coord', 'app', 'rendered-hash', 'rendered-html', 'object',
  82                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'mention',
  83                 'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
  84                 'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'owner-network', 'owner-contact-type',
  85                 'causer-id', 'causer-link', 'causer-name', 'causer-avatar', 'causer-contact-type', 'causer-network',
  86                 'contact-id', 'contact-uid', 'contact-link', 'contact-name', 'contact-avatar',
  87                 'writable', 'self', 'cid', 'alias',
  88                 'event-created', 'event-edited', 'event-start', 'event-finish',
  89                 'event-summary', 'event-desc', 'event-location', 'event-type',
  90                 'event-nofinish', 'event-adjust', 'event-ignore', 'event-id',
  91                 'delivery_queue_count', 'delivery_queue_done', 'delivery_queue_failed'
  92         ];
  93
  94         // Field list that is used to deliver items via the protocols
  95         const DELIVER_FIELDLIST = ['uid', 'id', 'parent', 'uri-id', 'uri', 'thr-parent', 'parent-uri', 'guid',
  96                         'parent-guid', 'received', 'created', 'edited', 'verb', 'object-type', 'object', 'target',
  97                         'private', 'title', 'body', 'raw-body', 'location', 'coord', 'app',
  98                         'inform', 'deleted', 'extid', 'post-type', 'post-reason', 'gravity',
  99                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 100                         'author-id', 'author-link', 'author-name', 'author-avatar', 'owner-id', 'owner-link', 'contact-uid',
 101                         'signed_text', 'network', 'wall', 'contact-id', 'plink', 'forum_mode', 'origin',
 102                         'thr-parent-id', 'parent-uri-id', 'postopts', 'pubmail',
 103                         'event-created', 'event-edited', 'event-start', 'event-finish',
 104                         'event-summary', 'event-desc', 'event-location', 'event-type',
 105                         'event-nofinish', 'event-adjust', 'event-ignore', 'event-id'];
 106
 107         // All fields in the item table
 108         const ITEM_FIELDLIST = ['id', 'uid', 'parent', 'uri', 'parent-uri', 'thr-parent',
 109                         'guid', 'uri-id', 'parent-uri-id', 'thr-parent-id', 'vid',
 110                         'contact-id', 'wall', 'gravity', 'extid', 'psid',
 111                         'created', 'edited', 'commented', 'received', 'changed', 'verb',
 112                         'postopts', 'plink', 'resource-id', 'event-id', 'inform',
 113                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid', 'post-type', 'post-reason',
 114                         'private', 'pubmail', 'visible', 'starred',
 115                         'unseen', 'deleted', 'origin', 'forum_mode', 'mention', 'global', 'network',
 116                         'title', 'content-warning', 'body', 'location', 'coord', 'app',
 117                         'rendered-hash', 'rendered-html', 'object-type', 'object', 'target-type', 'target',
 118                         'author-id', 'author-link', 'author-name', 'author-avatar', 'author-network',
 119                         'owner-id', 'owner-link', 'owner-name', 'owner-avatar', 'causer-id'];
 120
 121         // List of all verbs that don't need additional content data.
 122         // Never reorder or remove entries from this list. Just add new ones at the end, if needed.
 123         const ACTIVITIES = [
 124                 Activity::LIKE, Activity::DISLIKE,
 125                 Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE,
 126                 Activity::FOLLOW,
 127                 Activity::ANNOUNCE];
 128
 129         const PUBLIC = 0;
 130         const PRIVATE = 1;
 131         const UNLISTED = 2;
 132
 133         /**
 134          * Update existing item entries
 135          *
 136          * @param array $fields    The fields that are to be changed
 137          * @param array $condition The condition for finding the item entries
 138          *
 139          * In the future we may have to change permissions as well.
 140          * Then we had to add the user id as third parameter.
 141          *
 142          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
 143          *
 144          * @return integer|boolean number of affected rows - or "false" if there was an error
 145          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 146          */
 147         public static function update(array $fields, array $condition)
 148         {
 149                 if (empty($condition) || empty($fields)) {
 150                         return false;
 151                 }
 152
 153                 if (!empty($fields['verb'])) {
 154                         $fields['vid'] = Verb::getID($fields['verb']);
 155                 }
 156
 157                 $rows = Post::update($fields, $condition);
 158                 if (is_bool($rows)) {
 159                         return $rows;
 160                 }
 161
 162                 // We only need to call the line by line update for specific fields
 163                 if (empty($fields['body']) && empty($fields['file']) &&
 164                         empty($fields['attach']) && empty($fields['edited'])) {
 165                         return $rows;
 166                 }
 167
 168                 Logger::info('Updating per single row method', ['fields' => $fields, 'condition' => $condition]);
 169
 170                 $items = Post::select(['id', 'origin', 'uri-id', 'uid'], $condition);
 171
 172                 $notify_items = [];
 173
 174                 while ($item = DBA::fetch($items)) {
 175                         if (!empty($fields['body'])) {
 176                                 $content_fields = ['raw-body' => trim($fields['raw-body'] ?? $fields['body'])];
 177
 178                                 // Remove all media attachments from the body and store them in the post-media table
 179                                 $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 180                                 $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 181                         }
 182
 183                         if (!empty($fields['file'])) {
 184                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $fields['file']);
 185                         }
 186
 187                         if (!empty($fields['attach'])) {
 188                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 189                         }
 190
 191                         // We only need to notfiy others when it is an original entry from us.
 192                         // Only call the notifier when the item has some content relevant change.
 193                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 194                                 $notify_items[] = $item['id'];
 195                         }
 196                 }
 197
 198                 DBA::close($items);
 199
 200                 foreach ($notify_items as $notify_item) {
 201                         $post = Post::selectFirst(['uri-id', 'uid'], ['id' => $notify_item]);
 202                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, (int)$post['uri-id'], (int)$post['uid']);
 203                 }
 204
 205                 return $rows;
 206         }
 207
 208         /**
 209          * Delete an item and notify others about it - if it was ours
 210          *
 211          * @param array   $condition The condition for finding the item entries
 212          * @param integer $priority  Priority for the notification
 213          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 214          */
 215         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 216         {
 217                 $items = Post::select(['id'], $condition);
 218                 while ($item = Post::fetch($items)) {
 219                         self::markForDeletionById($item['id'], $priority);
 220                 }
 221                 DBA::close($items);
 222         }
 223
 224         /**
 225          * Delete an item for an user and notify others about it - if it was ours
 226          *
 227          * @param array   $condition The condition for finding the item entries
 228          * @param integer $uid       User who wants to delete this item
 229          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 230          */
 231         public static function deleteForUser($condition, $uid)
 232         {
 233                 if ($uid == 0) {
 234                         return;
 235                 }
 236
 237                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 238                 while ($item = Post::fetch($items)) {
 239                         if (in_array($item['uid'], [$uid, 0])) {
 240                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 241                                 Post\ThreadUser::update($item['uri-id'], $uid, ['hidden' => true], true);
 242                         }
 243
 244                         if ($item['uid'] == $uid) {
 245                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 246                         } elseif ($item['uid'] != 0) {
 247                                 Logger::notice('Wrong ownership. Not deleting item', ['id' => $item['id']]);
 248                         }
 249                 }
 250                 DBA::close($items);
 251         }
 252
 253         /**
 254          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 255          *
 256          * @param integer $item_id
 257          * @param integer $priority Priority for the notification
 258          *
 259          * @return boolean success
 260          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 261          */
 262         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 263         {
 264                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 265                 // locate item to be deleted
 266                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri-id', 'origin',
 267                         'deleted', 'resource-id', 'event-id',
 268                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 269                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 270                 if (!DBA::isResult($item)) {
 271                         Logger::info('Item not found.', ['id' => $item_id]);
 272                         return false;
 273                 }
 274
 275                 if ($item['deleted']) {
 276                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 277                         return false;
 278                 }
 279
 280                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 281                 if (!DBA::isResult($parent)) {
 282                         $parent = ['origin' => false];
 283                 }
 284
 285                 // clean up categories and tags so they don't end up as orphans
 286                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 287
 288                 /*
 289                  * If item is a link to a photo resource, nuke all the associated photos
 290                  * (visitors will not have photo resources)
 291                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 292                  * generate a resource-id and therefore aren't intimately linked to the item.
 293                  */
 294                 /// @TODO: this should first check if photo is used elsewhere
 295                 if (strlen($item['resource-id'])) {
 296                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 297                 }
 298
 299                 // If item is a link to an event, delete the event.
 300                 if (intval($item['event-id'])) {
 301                         Event::delete($item['event-id']);
 302                 }
 303
 304                 // If item has attachments, drop them
 305                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 306                 foreach($attachments as $attachment) {
 307                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 308                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 309                         }
 310                 }
 311
 312                 // Set the item to "deleted"
 313                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 314                 Post::update($item_fields, ['id' => $item['id']]);
 315
 316                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 317
 318                 if (!Post::exists(["`uri-id` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri-id']])) {
 319                         self::markForDeletion(['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false], $priority);
 320                 }
 321
 322                 Post\DeliveryData::delete($item['uri-id']);
 323
 324                 // If it's the parent of a comment thread, kill all the kids
 325                 if ($item['gravity'] == GRAVITY_PARENT) {
 326                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 327                 }
 328
 329                 // Is it our comment and/or our thread?
 330                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 331                         // When we delete the original post we will delete all existing copies on the server as well
 332                         self::markForDeletion(['uri-id' => $item['uri-id'], 'deleted' => false], $priority);
 333
 334                         // send the notification upstream/downstream
 335                         if ($priority) {
 336                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, (int)$item['uri-id'], (int)$item['uid']);
 337                         }
 338                 } elseif ($item['uid'] != 0) {
 339                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 340                         Post\ThreadUser::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 341                 }
 342
 343                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 344
 345                 return true;
 346         }
 347
 348         private static function guid($item, $notify)
 349         {
 350                 if (!empty($item['guid'])) {
 351                         return Strings::escapeTags(trim($item['guid']));
 352                 }
 353
 354                 if ($notify) {
 355                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 356                         // We add the hash of our own host because our host is the original creator of the post.
 357                         $prefix_host = DI::baseUrl()->getHostname();
 358                 } else {
 359                         $prefix_host = '';
 360
 361                         // We are only storing the post so we create a GUID from the original hostname.
 362                         if (!empty($item['author-link'])) {
 363                                 $parsed = parse_url($item['author-link']);
 364                                 if (!empty($parsed['host'])) {
 365                                         $prefix_host = $parsed['host'];
 366                                 }
 367                         }
 368
 369                         if (empty($prefix_host) && !empty($item['plink'])) {
 370                                 $parsed = parse_url($item['plink']);
 371                                 if (!empty($parsed['host'])) {
 372                                         $prefix_host = $parsed['host'];
 373                                 }
 374                         }
 375
 376                         if (empty($prefix_host) && !empty($item['uri'])) {
 377                                 $parsed = parse_url($item['uri']);
 378                                 if (!empty($parsed['host'])) {
 379                                         $prefix_host = $parsed['host'];
 380                                 }
 381                         }
 382
 383                         // Is it in the format data@host.tld? - Used for mail contacts
 384                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 385                                 $mailparts = explode('@', $item['author-link']);
 386                                 $prefix_host = array_pop($mailparts);
 387                         }
 388                 }
 389
 390                 if (!empty($item['plink'])) {
 391                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 392                 } elseif (!empty($item['uri'])) {
 393                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 394                 } else {
 395                         $guid = System::createUUID(hash('crc32', $prefix_host));
 396                 }
 397
 398                 return $guid;
 399         }
 400
 401         private static function contactId($item)
 402         {
 403                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 404                         return $item['contact-id'];
 405                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 406                         return $item['contact-id'];
 407                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 408                         return $item['author-id'];
 409                 } elseif (!empty($item['contact-id'])) {
 410                         return $item['contact-id'];
 411                 } else {
 412                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 413                         if (!empty($contact_id)) {
 414                                 return $contact_id;
 415                         }
 416                 }
 417                 return $item['author-id'];
 418         }
 419
 420         /**
 421          * Write an item array into a spool file to be inserted later.
 422          * This command is called whenever there are issues storing an item.
 423          *
 424          * @param array $item The item fields that are to be inserted
 425          * @throws \Exception
 426          */
 427         private static function spool($orig_item)
 428         {
 429                 // Now we store the data in the spool directory
 430                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 431                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 432
 433                 $spoolpath = get_spoolpath();
 434                 if ($spoolpath != "") {
 435                         $spool = $spoolpath . '/' . $file;
 436
 437                         file_put_contents($spool, json_encode($orig_item));
 438                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 439                 }
 440         }
 441
 442         /**
 443          * Check if the item array is a duplicate
 444          *
 445          * @param array $item
 446          * @return boolean is it a duplicate?
 447          */
 448         private static function isDuplicate(array $item)
 449         {
 450                 // Checking if there is already an item with the same guid
 451                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 452                 if (Post::exists($condition)) {
 453                         Logger::notice('Found already existing item', [
 454                                 'guid' => $item['guid'],
 455                                 'uid' => $item['uid'],
 456                                 'network' => $item['network']
 457                         ]);
 458                         return true;
 459                 }
 460
 461                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'],
 462                         'network' => [$item['network'], Protocol::DFRN]];
 463                 if (Post::exists($condition)) {
 464                         Logger::notice('duplicated item with the same uri found.', $item);
 465                         return true;
 466                 }
 467
 468                 // On Friendica and Diaspora the GUID is unique
 469                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 470                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 471                         if (Post::exists($condition)) {
 472                                 Logger::notice('duplicated item with the same guid found.', $item);
 473                                 return true;
 474                         }
 475                 } elseif ($item['network'] == Protocol::OSTATUS) {
 476                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 477                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 478                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 479                         if (Post::exists($condition)) {
 480                                 Logger::notice('duplicated item with the same body found.', $item);
 481                                 return true;
 482                         }
 483                 }
 484
 485                 /*
 486                  * Check for already added items.
 487                  * There is a timing issue here that sometimes creates double postings.
 488                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 489                  */
 490                 if (($item['uid'] == 0) && Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
 491                         Logger::notice('Global item already stored.', ['uri-id' => $item['uri-id'], 'network' => $item['network']]);
 492                         return true;
 493                 }
 494
 495                 return false;
 496         }
 497
 498         /**
 499          * Check if the item array is valid
 500          *
 501          * @param array $item
 502          * @return boolean item is valid
 503          */
 504         public static function isValid(array $item)
 505         {
 506                 // When there is no content then we don't post it
 507                 if ($item['body'] . $item['title'] == '') {
 508                         Logger::notice('No body, no title.');
 509                         return false;
 510                 }
 511
 512                 if (!empty($item['uid'])) {
 513                         $owner = User::getOwnerDataById($item['uid'], false);
 514                         if (!$owner) {
 515                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 516                                 return false;
 517                         }
 518
 519                         if ($owner['account_expired'] || $owner['account_removed']) {
 520                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 521                                 return false;
 522                         }
 523                 }
 524
 525                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 526                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 527                         return false;
 528                 }
 529
 530                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 531                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 532                         return false;
 533                 }
 534
 535                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 536                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 537                         return false;
 538                 }
 539
 540                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 541                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 542                         return false;
 543                 }
 544
 545                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 546                         return false;
 547                 }
 548
 549                 if ($item['verb'] == Activity::FOLLOW) {
 550                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 551                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 552                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 553                                 return false;
 554                         }
 555
 556                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 557                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 558                         if (Post::exists($condition)) {
 559                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 560                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 561                                 return false;
 562                         }
 563                 }
 564
 565                 return true;
 566         }
 567
 568         /**
 569          * Check if the item array is too old
 570          *
 571          * @param array $item
 572          * @return boolean item is too old
 573          */
 574         public static function isTooOld(array $item)
 575         {
 576                 // check for create date and expire time
 577                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 578
 579                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 580                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 581                         $expire_interval = $user['expire'];
 582                 }
 583
 584                 if (($expire_interval > 0) && !empty($item['created'])) {
 585                         $expire_date = time() - ($expire_interval * 86400);
 586                         $created_date = strtotime($item['created']);
 587                         if ($created_date < $expire_date) {
 588                                 Logger::notice('Item created before expiration interval.', [
 589                                         'created' => date('c', $created_date),
 590                                         'expired' => date('c', $expire_date),
 591                                         '$item' => $item
 592                                 ]);
 593                                 return true;
 594                         }
 595                 }
 596
 597                 return false;
 598         }
 599
 600         /**
 601          * Return the id of the given item array if it has been stored before
 602          *
 603          * @param array $item
 604          * @return integer item id
 605          */
 606         private static function getDuplicateID(array $item)
 607         {
 608                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 609                         $condition = ["`uri-id` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 610                                 $item['uri-id'], $item['uid'],
 611                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 612                         $existing = Post::selectFirst(['id', 'network'], $condition);
 613                         if (DBA::isResult($existing)) {
 614                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 615                                 if ($item['uid'] != 0) {
 616                                         Logger::notice('Item already existed for user', [
 617                                                 'uri-id' => $item['uri-id'],
 618                                                 'uid' => $item['uid'],
 619                                                 'network' => $item['network'],
 620                                                 'existing_id' => $existing["id"],
 621                                                 'existing_network' => $existing["network"]
 622                                         ]);
 623                                 }
 624
 625                                 return $existing["id"];
 626                         }
 627                 }
 628                 return 0;
 629         }
 630
 631         /**
 632          * Fetch top-level parent data for the given item array
 633          *
 634          * @param array $item
 635          * @return array item array with parent data
 636          * @throws \Exception
 637          */
 638         private static function getTopLevelParent(array $item)
 639         {
 640                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 641                         'uri-id', 'parent-uri-id',
 642                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 643                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 644                 $condition = ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']];
 645                 $params = ['order' => ['id' => false]];
 646                 $parent = Post::selectFirst($fields, $condition, $params);
 647
 648                 if (!DBA::isResult($parent)) {
 649                         Logger::notice('item parent was not found - ignoring item', ['thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 650                         return [];
 651                 }
 652
 653                 if ($parent['uri-id'] == $parent['parent-uri-id']) {
 654                         return $parent;
 655                 }
 656
 657                 $condition = ['uri-id' => $parent['parent-uri-id'],
 658                         'parent-uri-id' => $parent['parent-uri-id'],
 659                         'uid' => $parent['uid']];
 660                 $params = ['order' => ['id' => false]];
 661                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 662                 if (!DBA::isResult($toplevel_parent)) {
 663                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri-id' => $parent['parent-uri-id'], 'uid' => $parent['uid']]);
 664                         return [];
 665                 }
 666
 667                 return $toplevel_parent;
 668         }
 669
 670         /**
 671          * Get the gravity for the given item array
 672          *
 673          * @param array $item
 674          * @return integer gravity
 675          */
 676         private static function getGravity(array $item)
 677         {
 678                 $activity = DI::activity();
 679
 680                 if (isset($item['gravity'])) {
 681                         return intval($item['gravity']);
 682                 } elseif ($item['parent-uri-id'] === $item['uri-id']) {
 683                         return GRAVITY_PARENT;
 684                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 685                         return GRAVITY_COMMENT;
 686                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 687                         return GRAVITY_ACTIVITY;
 688                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 689                         return GRAVITY_ACTIVITY;
 690                 }
 691                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 692                 return GRAVITY_UNKNOWN;   // Should not happen
 693         }
 694
 695         public static function insert($item, $notify = false, $dontcache = false)
 696         {
 697                 $orig_item = $item;
 698
 699                 $priority = PRIORITY_HIGH;
 700
 701                 // If it is a posting where users should get notifications, then define it as wall posting
 702                 if ($notify) {
 703                         $item['wall'] = 1;
 704                         $item['origin'] = 1;
 705                         $item['network'] = Protocol::DFRN;
 706                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 707                         $item['direction'] = Conversation::PUSH;
 708
 709                         if (in_array($notify, PRIORITIES)) {
 710                                 $priority = $notify;
 711                         }
 712                 } else {
 713                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 714                 }
 715
 716                 $uid = intval($item['uid']);
 717
 718                 $item['guid'] = self::guid($item, $notify);
 719                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 720
 721                 // Store URI data
 722                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 723
 724                 // Backward compatibility: parent-uri used to be the direct parent uri.
 725                 // If it is provided without a thr-parent, it probably is the old behavior.
 726                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 727                 $item['parent-uri'] = $item['thr-parent'];
 728
 729                 $item['thr-parent-id'] = $item['parent-uri-id'] = ItemURI::getIdByURI($item['thr-parent']);
 730
 731                 // Store conversation data
 732                 $item = Conversation::insert($item);
 733
 734                 /*
 735                  * Do we already have this item?
 736                  * We have to check several networks since Friendica posts could be repeated
 737                  * via OStatus (maybe Diasporsa as well)
 738                  */
 739                 $duplicate = self::getDuplicateID($item);
 740                 if ($duplicate) {
 741                         return $duplicate;
 742                 }
 743
 744                 // Additional duplicate checks
 745                 /// @todo Check why the first duplication check returns the item number and the second a 0
 746                 if (self::isDuplicate($item)) {
 747                         return 0;
 748                 }
 749
 750                 if (!isset($item['post-type'])) {
 751                         $item['post-type'] = empty($item['title']) ? self::PT_NOTE : self::PT_ARTICLE;
 752                 }
 753
 754                 $item['wall']          = intval($item['wall'] ?? 0);
 755                 $item['extid']         = trim($item['extid'] ?? '');
 756                 $item['author-name']   = trim($item['author-name'] ?? '');
 757                 $item['author-link']   = trim($item['author-link'] ?? '');
 758                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 759                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 760                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 761                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 762                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 763                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 764                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 765                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 766                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 767                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 768                 $item['location']      = trim($item['location'] ?? '');
 769                 $item['coord']         = trim($item['coord'] ?? '');
 770                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 771                 $item['deleted']       = 0;
 772                 $item['verb']          = trim($item['verb'] ?? '');
 773                 $item['object-type']   = trim($item['object-type'] ?? '');
 774                 $item['object']        = trim($item['object'] ?? '');
 775                 $item['target-type']   = trim($item['target-type'] ?? '');
 776                 $item['target']        = trim($item['target'] ?? '');
 777                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 778                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 779                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 780                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 781                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 782                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 783                 $item['body']          = trim($item['body'] ?? '');
 784                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 785                 $item['app']           = trim($item['app'] ?? '');
 786                 $item['origin']        = intval($item['origin'] ?? 0);
 787                 $item['postopts']      = trim($item['postopts'] ?? '');
 788                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 789                 $item['event-id']      = intval($item['event-id'] ?? 0);
 790                 $item['inform']        = trim($item['inform'] ?? '');
 791                 $item['file']          = trim($item['file'] ?? '');
 792
 793                 // Items cannot be stored before they happen ...
 794                 if ($item['created'] > DateTimeFormat::utcNow()) {
 795                         $item['created'] = DateTimeFormat::utcNow();
 796                 }
 797
 798                 // We haven't invented time travel by now.
 799                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 800                         $item['edited'] = DateTimeFormat::utcNow();
 801                 }
 802
 803                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 804
 805                 $item['gravity'] = self::getGravity($item);
 806
 807                 $item['language'] = self::getLanguage($item);
 808
 809                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 810                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 811                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 812
 813                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 814                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 815                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 816
 817                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 818                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 819                         $item['post-reason'] = self::PR_FOLLOWER;
 820                 }
 821
 822                 // Ensure that there is an avatar cache
 823                 Contact::checkAvatarCache($item['author-id']);
 824                 Contact::checkAvatarCache($item['owner-id']);
 825
 826                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 827                 $item["contact-id"] = self::contactId($item);
 828
 829                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 830                         self::isTooOld($item)) {
 831                         Logger::info('Item is too old', ['item' => $item]);
 832                         return 0;
 833                 }
 834
 835                 if (!self::isValid($item)) {
 836                         return 0;
 837                 }
 838
 839                 if ($item['gravity'] !== GRAVITY_PARENT) {
 840                         $toplevel_parent = self::getTopLevelParent($item);
 841                         if (empty($toplevel_parent)) {
 842                                 return 0;
 843                         }
 844
 845                         // If the thread originated from this node, we check the permission against the thread starter
 846                         $condition = ['uri-id' => $toplevel_parent['uri-id'], 'wall' => true];
 847                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 848                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 849                                 return 0;
 850                         }
 851
 852                         $parent_id             = $toplevel_parent['id'];
 853                         $item['parent-uri']    = $toplevel_parent['uri'];
 854                         $item['parent-uri-id'] = $toplevel_parent['uri-id'];
 855                         $item['deleted']       = $toplevel_parent['deleted'];
 856                         $item['allow_cid']     = $toplevel_parent['allow_cid'];
 857                         $item['allow_gid']     = $toplevel_parent['allow_gid'];
 858                         $item['deny_cid']      = $toplevel_parent['deny_cid'];
 859                         $item['deny_gid']      = $toplevel_parent['deny_gid'];
 860                         $parent_origin         = $toplevel_parent['origin'];
 861
 862                         // Don't federate received participation messages
 863                         if ($item['verb'] != Activity::FOLLOW) {
 864                                 $item['wall'] = $toplevel_parent['wall'];
 865                         } else {
 866                                 $item['wall'] = false;
 867                                 // Participations are technical messages, so they are set to "seen" automatically
 868                                 $item['unseen'] = false;
 869                         }
 870
 871                         /*
 872                          * If the parent is private, force privacy for the entire conversation
 873                          * This differs from the above settings as it subtly allows comments from
 874                          * email correspondents to be private even if the overall thread is not.
 875                          */
 876                         if ($toplevel_parent['private']) {
 877                                 $item['private'] = $toplevel_parent['private'];
 878                         }
 879
 880                         /*
 881                          * Edge case. We host a public forum that was originally posted to privately.
 882                          * The original author commented, but as this is a comment, the permissions
 883                          * weren't fixed up so it will still show the comment as private unless we fix it here.
 884                          */
 885                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
 886                                 $item['private'] = self::PUBLIC;
 887                         }
 888
 889                         // If its a post that originated here then tag the thread as "mention"
 890                         if ($item['origin'] && $item['uid']) {
 891                                 DBA::update('post-thread-user', ['mention' => true], ['uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 892                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'parent-uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 893                         }
 894
 895                         // Update the contact relations
 896                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 897                 } else {
 898                         $parent_id = 0;
 899                         $parent_origin = $item['origin'];
 900                 }
 901
 902                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
 903                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
 904
 905                 // Is this item available in the global items (with uid=0)?
 906                 if ($item["uid"] == 0) {
 907                         $item["global"] = true;
 908
 909                         // Set the global flag on all items if this was a global item entry
 910                         Post::update(['global' => true], ['uri-id' => $item['uri-id']]);
 911                 } else {
 912                         $item['global'] = Post::exists(['uid' => 0, 'uri-id' => $item['uri-id']]);
 913                 }
 914
 915                 // ACL settings
 916                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
 917                         $item["private"] = self::PRIVATE;
 918                 }
 919
 920                 if ($notify) {
 921                         $item['edit'] = false;
 922                         $item['parent'] = $parent_id;
 923                         Hook::callAll('post_local', $item);
 924                 } else {
 925                         Hook::callAll('post_remote', $item);
 926                 }
 927
 928                 if (!empty($item['cancel'])) {
 929                         Logger::log('post cancelled by addon.');
 930                         return 0;
 931                 }
 932
 933                 if (empty($item['vid']) && !empty($item['verb'])) {
 934                         $item['vid'] = Verb::getID($item['verb']);
 935                 }
 936
 937                 // Creates or assigns the permission set
 938                 $item['psid'] = PermissionSet::getIdFromACL(
 939                         $item['uid'],
 940                         $item['allow_cid'],
 941                         $item['allow_gid'],
 942                         $item['deny_cid'],
 943                         $item['deny_gid']
 944                 );
 945
 946                 if (!empty($item['extid'])) {
 947                         $item['external-id'] = ItemURI::getIdByURI($item['extid']);
 948                 }
 949
 950                 if ($item['verb'] == Activity::ANNOUNCE) {
 951                         self::setOwnerforResharedItem($item);
 952                 }
 953
 954                 // Remove all media attachments from the body and store them in the post-media table
 955                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
 956                 $item['raw-body'] = self::setHashtags($item['raw-body']);
 957
 958                 // Check for hashtags in the body and repair or add hashtag links
 959                 $item['body'] = self::setHashtags($item['body']);
 960
 961                 // Fill the cache field
 962                 self::putInCache($item);
 963
 964                 if (stristr($item['verb'], Activity::POKE)) {
 965                         $notify_type = Delivery::POKE;
 966                 } else {
 967                         $notify_type = Delivery::POST;
 968                 }
 969
 970                 // Filling item related side tables
 971                 if (!empty($item['attach'])) {
 972                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
 973                 }
 974
 975                 if (empty($item['event-id'])) {
 976                         unset($item['event-id']);
 977                 }
 978
 979                 if (empty($item['causer-id'])) {
 980                         unset($item['causer-id']);
 981                 }
 982
 983                 Post::insert($item['uri-id'], $item);
 984
 985                 if ($item['gravity'] == GRAVITY_PARENT) {
 986                         Post\Thread::insert($item['uri-id'], $item);
 987                 }
 988
 989                 if (!in_array($item['verb'], self::ACTIVITIES)) {
 990                         Post\Content::insert($item['uri-id'], $item);
 991                 }
 992
 993                 // Diaspora signature
 994                 if (!empty($item['diaspora_signed_text'])) {
 995                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
 996                 }
 997
 998                 // Attached file links
 999                 if (!empty($item['file'])) {
1000                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1001                 }
1002
1003                 // Delivery relevant data
1004                 $delivery_data = Post\DeliveryData::extractFields($item);
1005
1006                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1007                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1008                 }
1009
1010                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1011                 if (!Tag::existsForPost($item['uri-id'])) {
1012                         Tag::storeFromBody($item['uri-id'], $item['body']);
1013                 }
1014
1015                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid']];
1016                 if (Post::exists($condition)) {
1017                         Logger::notice('Item is already inserted - aborting', $condition);
1018                         return 0;
1019                 }
1020
1021                 $post_user_id = Post\User::insert($item['uri-id'], $item['uid'], $item);
1022                 if (!$post_user_id) {
1023                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1024                         return 0;
1025                 }
1026
1027                 if ($item['gravity'] == GRAVITY_PARENT) {
1028                         $item['post-user-id'] = $post_user_id;
1029                         Post\ThreadUser::insert($item['uri-id'], $item['uid'], $item);
1030                 }
1031
1032                 Logger::notice('created item', ['post-id' => $post_user_id, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1033
1034                 $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['post-user-id' => $post_user_id]);
1035                 if (!DBA::isResult($posted_item)) {
1036                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1037                         Logger::warning('Could not store item. it will be spooled', ['id' => $post_user_id]);
1038                         self::spool($orig_item);
1039                         return 0;
1040                 }
1041
1042                 // update the commented timestamp on the parent
1043                 if (DI::config()->get('system', 'like_no_comment')) {
1044                         // Update when it is a comment
1045                         $update_commented = in_array($posted_item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1046                 } else {
1047                         // Update when it isn't a follow or tag verb
1048                         $update_commented = !in_array($posted_item['verb'], [Activity::FOLLOW, Activity::TAG]);
1049                 }
1050
1051                 if ($update_commented) {
1052                         $fields = ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
1053                 } else {
1054                         $fields = ['changed' => DateTimeFormat::utcNow()];
1055                 }
1056
1057                 Post::update($fields, ['uri-id' => $posted_item['parent-uri-id'], 'uid' => $posted_item['uid']]);
1058
1059                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1060                 if (self::tagDeliver($posted_item['uid'], $post_user_id)) {
1061                         // Get the user information for the logging
1062                         $user = User::getById($uid);
1063
1064                         Logger::notice('Item had been deleted', ['id' => $post_user_id, 'user' => $uid, 'account-type' => $user['account-type']]);
1065                         return 0;
1066                 }
1067
1068                 if (!$dontcache) {
1069                         if ($notify) {
1070                                 Hook::callAll('post_local_end', $posted_item);
1071                         } else {
1072                                 Hook::callAll('post_remote_end', $posted_item);
1073                         }
1074                 }
1075
1076                 if ($posted_item['gravity'] === GRAVITY_PARENT) {
1077                         self::addShadow($post_user_id);
1078                 } else {
1079                         self::addShadowPost($post_user_id);
1080                 }
1081
1082                 self::updateContact($posted_item);
1083
1084                 Post\UserNotification::setNotification($posted_item['uri-id'], $posted_item['uid']);
1085
1086                 check_user_notification($posted_item['uri-id'], $posted_item['uid']);
1087
1088                 // Distribute items to users who subscribed to their tags
1089                 self::distributeByTags($posted_item);
1090
1091                 // Automatically reshare the item if the "remote_self" option is selected
1092                 self::autoReshare($posted_item);
1093
1094                 $transmit = $notify || ($posted_item['visible'] && ($parent_origin || $posted_item['origin']));
1095
1096                 if ($transmit) {
1097                         // Don't relay participation messages
1098                         if (($posted_item['verb'] == Activity::FOLLOW) &&
1099                                 (!$posted_item['origin'] || ($posted_item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1100                                 Logger::info('Participation messages will not be relayed', ['item' => $posted_item['id'], 'uri' => $posted_item['uri'], 'verb' => $posted_item['verb']]);
1101                                 $transmit = false;
1102                         }
1103                 }
1104
1105                 if ($transmit) {
1106                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, (int)$posted_item['uri-id'], (int)$posted_item['uid']);
1107                 }
1108
1109                 return $post_user_id;
1110         }
1111
1112         /**
1113          * Change the owner of a parent item if it had been shared by a forum
1114          *
1115          * (public) forum posts in the new format consist of the regular post by the author
1116          * followed by an announce message sent from the forum account.
1117          * Changing the owner helps in grouping forum posts.
1118          *
1119          * @param array $item
1120          * @return void
1121          */
1122         private static function setOwnerforResharedItem(array $item)
1123         {
1124                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-reason'],
1125                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1126                 if (!DBA::isResult($parent)) {
1127                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1128                         return;
1129                 }
1130
1131                 $author = Contact::selectFirst(['url', 'contact-type', 'network'], ['id' => $item['author-id']]);
1132                 if (!DBA::isResult($author)) {
1133                         Logger::error('Author not found', ['id' => $item['author-id']]);
1134                         return;
1135                 }
1136
1137                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1138                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1139                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid'], 'cid' => $cid]);
1140                         return;
1141                 }
1142
1143                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1144                         if ($parent['post-reason'] == self::PR_ANNOUNCEMENT) {
1145                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1146                                 return;
1147                         }
1148
1149                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1150                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1151                                 return;
1152                         }
1153                         self::update(['post-reason' => self::PR_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1154                         Logger::info('Set announcement post-reason', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1155                         return;
1156                 }
1157
1158                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1159                 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]);
1160         }
1161
1162         /**
1163          * Distribute the given item to users who subscribed to their tags
1164          *
1165          * @param array $item     Processed item
1166          */
1167         private static function distributeByTags(array $item)
1168         {
1169                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1170                         return;
1171                 }
1172
1173                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1174                 foreach ($uids as $uid) {
1175                         if (Contact::isSharing($item['author-id'], $uid)) {
1176                                 $fields = [];
1177                         } else {
1178                                 $fields = ['post-reason' => self::PR_TAG];
1179                         }
1180
1181                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1182                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1183                 }
1184         }
1185
1186         /**
1187          * Distributes public items to the receivers
1188          *
1189          * @param integer $itemid      Item ID that should be added
1190          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1191          * @throws \Exception
1192          */
1193         public static function distribute($itemid, $signed_text = '')
1194         {
1195                 $condition = ["`id` IN (SELECT `parent` FROM `post-user-view` WHERE `id` = ?)", $itemid];
1196                 $parent = Post::selectFirst(['owner-id'], $condition);
1197                 if (!DBA::isResult($parent)) {
1198                         Logger::warning('Item not found', ['condition' => $condition]);
1199                         return;
1200                 }
1201
1202                 // Only distribute public items from native networks
1203                 $condition = ['id' => $itemid, 'uid' => 0,
1204                         'network' => array_merge(Protocol::FEDERATED ,['']),
1205                         'visible' => true, 'deleted' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1206                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1207                 if (!DBA::isResult($item)) {
1208                         Logger::warning('Item not found', ['condition' => $condition]);
1209                         return;
1210                 }
1211
1212                 $origin = $item['origin'];
1213
1214                 $users = [];
1215
1216                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1217                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1218                 if (!DBA::isResult($owner)) {
1219                         return;
1220                 }
1221
1222                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1223                 $contacts = DBA::select('contact', ['uid'], $condition);
1224                 while ($contact = DBA::fetch($contacts)) {
1225                         if ($contact['uid'] == 0) {
1226                                 continue;
1227                         }
1228
1229                         $users[$contact['uid']] = $contact['uid'];
1230                 }
1231                 DBA::close($contacts);
1232
1233                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1234                 $contacts = DBA::select('contact', ['uid'], $condition);
1235                 while ($contact = DBA::fetch($contacts)) {
1236                         if ($contact['uid'] == 0) {
1237                                 continue;
1238                         }
1239
1240                         $users[$contact['uid']] = $contact['uid'];
1241                 }
1242                 DBA::close($contacts);
1243
1244                 if (!empty($owner['alias'])) {
1245                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1246                         $contacts = DBA::select('contact', ['uid'], $condition);
1247                         while ($contact = DBA::fetch($contacts)) {
1248                                 if ($contact['uid'] == 0) {
1249                                         continue;
1250                                 }
1251
1252                                 $users[$contact['uid']] = $contact['uid'];
1253                         }
1254                         DBA::close($contacts);
1255                 }
1256
1257                 $origin_uid = 0;
1258
1259                 if ($item['uri-id'] != $item['parent-uri-id']) {
1260                         $parents = Post::select(['uid', 'origin'], ["`uri-id` = ? AND `uid` != 0", $item['parent-uri-id']]);
1261                         while ($parent = Post::fetch($parents)) {
1262                                 $users[$parent['uid']] = $parent['uid'];
1263                                 if ($parent['origin'] && !$origin) {
1264                                         $origin_uid = $parent['uid'];
1265                                 }
1266                         }
1267                         DBA::close($parents);
1268                 }
1269
1270                 foreach ($users as $uid) {
1271                         if ($origin_uid == $uid) {
1272                                 $item['diaspora_signed_text'] = $signed_text;
1273                         }
1274                         self::storeForUser($item, $uid);
1275                 }
1276         }
1277
1278         /**
1279          * Store a public item defined by their URI-ID for the given users
1280          *
1281          * @param integer $uri_id URI-ID of the given item
1282          * @param integer $uid    The user that will receive the item entry
1283          * @param array   $fields Additional fields to be stored
1284          * @return integer stored item id
1285          */
1286         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1287         {
1288                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1289                 if (!DBA::isResult($item)) {
1290                         return 0;
1291                 }
1292
1293                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1294                         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']]);
1295                         return 0;
1296                 }
1297
1298                 $item['post-reason'] = self::PR_STORED;
1299
1300                 $item = array_merge($item, $fields);
1301
1302                 $stored = self::storeForUser($item, $uid);
1303                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1304                 return $stored;
1305         }
1306
1307         /**
1308          * Store a public item array for the given users
1309          *
1310          * @param array   $item   The item entry that will be stored
1311          * @param integer $uid    The user that will receive the item entry
1312          * @return integer stored item id
1313          * @throws \Exception
1314          */
1315         private static function storeForUser(array $item, int $uid)
1316         {
1317                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1318                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1319                         return 0;
1320                 }
1321
1322                 unset($item['id']);
1323                 unset($item['parent']);
1324                 unset($item['mention']);
1325                 unset($item['starred']);
1326                 unset($item['unseen']);
1327                 unset($item['psid']);
1328
1329                 $item['uid'] = $uid;
1330                 $item['origin'] = 0;
1331                 $item['wall'] = 0;
1332
1333                 if ($item['gravity'] == GRAVITY_PARENT) {
1334                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1335                 } else {
1336                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1337                 }
1338
1339                 if (!empty($contact['id'])) {
1340                         $item['contact-id'] = $contact['id'];
1341                 } else {
1342                         // Shouldn't happen at all
1343                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1344                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1345                         if (!DBA::isResult($self)) {
1346                                 // Shouldn't happen even less
1347                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1348                                 return 0;
1349                         }
1350                         $item['contact-id'] = $self['id'];
1351                 }
1352
1353                 /// @todo Handling of "event-id"
1354
1355                 $notify = false;
1356                 if ($item['gravity'] == GRAVITY_PARENT) {
1357                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1358                         if (DBA::isResult($contact)) {
1359                                 $notify = self::isRemoteSelf($contact, $item);
1360                         }
1361                 }
1362
1363                 $distributed = self::insert($item, $notify, true);
1364
1365                 if (!$distributed) {
1366                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1367                 } else {
1368                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1369                 }
1370                 return $distributed;
1371         }
1372
1373         /**
1374          * Add a shadow entry for a given item id that is a thread starter
1375          *
1376          * We store every public item entry additionally with the user id "0".
1377          * This is used for the community page and for the search.
1378          * It is planned that in the future we will store public item entries only once.
1379          *
1380          * @param integer $itemid Item ID that should be added
1381          * @throws \Exception
1382          */
1383         private static function addShadow($itemid)
1384         {
1385                 $fields = ['uid', 'private', 'visible', 'deleted', 'network', 'uri-id'];
1386                 $condition = ['id' => $itemid, 'gravity' => GRAVITY_PARENT];
1387                 $item = Post::selectFirst($fields, $condition);
1388
1389                 if (!DBA::isResult($item)) {
1390                         return;
1391                 }
1392
1393                 // is it already a copy?
1394                 if (($itemid == 0) || ($item['uid'] == 0)) {
1395                         return;
1396                 }
1397
1398                 // Is it a visible public post?
1399                 if (!$item["visible"] || $item["deleted"]  || ($item["private"] == self::PRIVATE)) {
1400                         return;
1401                 }
1402
1403                 // is it an entry from a connector? Only add an entry for natively connected networks
1404                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1405                         return;
1406                 }
1407
1408                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1409                         return;
1410                 }
1411
1412                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1413
1414                 if (DBA::isResult($item)) {
1415                         // Preparing public shadow (removing user specific data)
1416                         $item['uid'] = 0;
1417                         unset($item['id']);
1418                         unset($item['parent']);
1419                         unset($item['wall']);
1420                         unset($item['mention']);
1421                         unset($item['origin']);
1422                         unset($item['starred']);
1423                         unset($item['postopts']);
1424                         unset($item['inform']);
1425                         unset($item['post-reason']);
1426                         if ($item['uri-id'] == $item['parent-uri-id']) {
1427                                 $item['contact-id'] = $item['owner-id'];
1428                         } else {
1429                                 $item['contact-id'] = $item['author-id'];
1430                         }
1431
1432                         $public_shadow = self::insert($item, false, true);
1433
1434                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1435                 }
1436         }
1437
1438         /**
1439          * Add a shadow entry for a given item id that is a comment
1440          *
1441          * This function does the same like the function above - but for comments
1442          *
1443          * @param integer $itemid Item ID that should be added
1444          * @throws \Exception
1445          */
1446         private static function addShadowPost($itemid)
1447         {
1448                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1449                 if (!DBA::isResult($item)) {
1450                         return;
1451                 }
1452
1453                 // Is it a toplevel post?
1454                 if ($item['gravity'] == GRAVITY_PARENT) {
1455                         self::addShadow($itemid);
1456                         return;
1457                 }
1458
1459                 // Is this a shadow entry?
1460                 if ($item['uid'] == 0) {
1461                         return;
1462                 }
1463
1464                 // Is there a shadow parent?
1465                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
1466                         return;
1467                 }
1468
1469                 // Is there already a shadow entry?
1470                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1471                         return;
1472                 }
1473
1474                 // Save "origin" and "parent" state
1475                 $origin = $item['origin'];
1476                 $parent = $item['parent'];
1477
1478                 // Preparing public shadow (removing user specific data)
1479                 $item['uid'] = 0;
1480                 unset($item['id']);
1481                 unset($item['parent']);
1482                 unset($item['wall']);
1483                 unset($item['mention']);
1484                 unset($item['origin']);
1485                 unset($item['starred']);
1486                 unset($item['postopts']);
1487                 unset($item['inform']);
1488                 unset($item['post-reason']);
1489                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1490
1491                 $public_shadow = self::insert($item, false, true);
1492
1493                 Logger::info('Stored public shadow', ['uri-id' => $item['uri-id'], 'id' => $public_shadow]);
1494
1495                 // If this was a comment to a Diaspora post we don't get our comment back.
1496                 // This means that we have to distribute the comment by ourselves.
1497                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1498                         self::distribute($public_shadow);
1499                 }
1500         }
1501
1502         /**
1503          * Adds a language specification in a "language" element of given $arr.
1504          * Expects "body" element to exist in $arr.
1505          *
1506          * @param array $item
1507          * @return string detected language
1508          * @throws \Text_LanguageDetect_Exception
1509          */
1510         private static function getLanguage(array $item)
1511         {
1512                 if (!empty($item['language'])) {
1513                         return $item['language'];
1514                 }
1515
1516                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1517                         return '';
1518                 }
1519
1520                 // Convert attachments to links
1521                 $naked_body = BBCode::removeAttachment($item['body']);
1522                 if (empty($naked_body)) {
1523                         return '';
1524                 }
1525
1526                 // Remove links and pictures
1527                 $naked_body = BBCode::removeLinks($naked_body);
1528
1529                 // Convert the title and the body to plain text
1530                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1531
1532                 // Remove possibly remaining links
1533                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1534
1535                 if (empty($naked_body)) {
1536                         return '';
1537                 }
1538
1539                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1540                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1541                 if (is_array($languages)) {
1542                         return json_encode($languages);
1543                 }
1544
1545                 return '';
1546         }
1547
1548         public static function getLanguageMessage(array $item)
1549         {
1550                 $iso639 = new \Matriphe\ISO639\ISO639;
1551
1552                 $used_languages = '';
1553                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1554                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1555                 }
1556                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1557                 return $used_languages;
1558         }
1559
1560         /**
1561          * Creates an unique guid out of a given uri
1562          *
1563          * @param string $uri uri of an item entry
1564          * @param string $host hostname for the GUID prefix
1565          * @return string unique guid
1566          */
1567         public static function guidFromUri($uri, $host)
1568         {
1569                 // Our regular guid routine is using this kind of prefix as well
1570                 // We have to avoid that different routines could accidentally create the same value
1571                 $parsed = parse_url($uri);
1572
1573                 // We use a hash of the hostname as prefix for the guid
1574                 $guid_prefix = hash("crc32", $host);
1575
1576                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1577                 unset($parsed["scheme"]);
1578
1579                 // Glue it together to be able to make a hash from it
1580                 $host_id = implode("/", $parsed);
1581
1582                 // We could use any hash algorithm since it isn't a security issue
1583                 $host_hash = hash("ripemd128", $host_id);
1584
1585                 return $guid_prefix.$host_hash;
1586         }
1587
1588         /**
1589          * generate an unique URI
1590          *
1591          * @param integer $uid  User id
1592          * @param string  $guid An existing GUID (Otherwise it will be generated)
1593          *
1594          * @return string
1595          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1596          */
1597         public static function newURI($uid, $guid = "")
1598         {
1599                 if ($guid == "") {
1600                         $guid = System::createUUID();
1601                 }
1602
1603                 return DI::baseUrl()->get() . '/objects/' . $guid;
1604         }
1605
1606         /**
1607          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1608          *
1609          * This can be used to filter for inactive contacts.
1610          * Only do this for public postings to avoid privacy problems, since poco data is public.
1611          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1612          *
1613          * @param array $arr Contains the just posted item record
1614          * @throws \Exception
1615          */
1616         private static function updateContact($arr)
1617         {
1618                 // Unarchive the author
1619                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1620                 if (DBA::isResult($contact)) {
1621                         Contact::unmarkForArchival($contact);
1622                 }
1623
1624                 // Unarchive the contact if it's not our own contact
1625                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1626                 if (DBA::isResult($contact)) {
1627                         Contact::unmarkForArchival($contact);
1628                 }
1629
1630                 /// @todo On private posts we could obfuscate the date
1631                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1632
1633                 // Is it a forum? Then we don't care about the rules from above
1634                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri-id"] === $arr["uri-id"])) {
1635                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1636                                 $update = true;
1637                         }
1638                 }
1639
1640                 if ($update) {
1641                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1642                         // So we have to ensure to only update the last item when it had been our own post,
1643                         // or it had been done by a "regular" contact.
1644                         if (!empty($arr['wall'])) {
1645                                 $condition = ['id' => $arr['contact-id']];
1646                         } else {
1647                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1648                         }
1649                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1650                 }
1651                 // Now do the same for the system wide contacts with uid=0
1652                 if ($arr['private'] != self::PRIVATE) {
1653                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1654                                 ['id' => $arr['owner-id']]);
1655
1656                         if ($arr['owner-id'] != $arr['author-id']) {
1657                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1658                                         ['id' => $arr['author-id']]);
1659                         }
1660                 }
1661         }
1662
1663         public static function setHashtags($body)
1664         {
1665                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1666                         $tags = BBCode::getTags($body);
1667
1668                         // No hashtags?
1669                         if (!count($tags)) {
1670                                 return $body;
1671                         }
1672
1673                         // This sorting is important when there are hashtags that are part of other hashtags
1674                         // Otherwise there could be problems with hashtags like #test and #test2
1675                         // Because of this we are sorting from the longest to the shortest tag.
1676                         usort($tags, function ($a, $b) {
1677                                 return strlen($b) <=> strlen($a);
1678                         });
1679
1680                         $URLSearchString = "^\[\]";
1681
1682                         // All hashtags should point to the home server if "local_tags" is activated
1683                         if (DI::config()->get('system', 'local_tags')) {
1684                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1685                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1686                         }
1687
1688                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1689                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1690                                 function ($match) {
1691                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1692                                 }, $body);
1693
1694                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1695                                 function ($match) {
1696                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1697                                 }, $body);
1698
1699                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1700                                 function ($match) {
1701                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1702                                 }, $body);
1703
1704                         // Repair recursive urls
1705                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1706                                 "&num;$2", $body);
1707
1708                         foreach ($tags as $tag) {
1709                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1710                                         continue;
1711                                 }
1712
1713                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1714                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1715
1716                                 $body = str_replace($tag, $newtag, $body);
1717                         }
1718
1719                         // Convert back the masked hashtags
1720                         $body = str_replace("&num;", "#", $body);
1721
1722                         return $body;
1723                 });
1724
1725                 return $body;
1726         }
1727
1728         /**
1729          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1730          *
1731          * @param int $uid
1732          * @param int $item_id
1733          * @return boolean true if item was deleted, else false
1734          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1735          * @throws \ImagickException
1736          */
1737         private static function tagDeliver($uid, $item_id)
1738         {
1739                 $mention = false;
1740
1741                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1742                 if (!DBA::isResult($user)) {
1743                         return false;
1744                 }
1745
1746                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1747                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1748
1749                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1750                 if (!DBA::isResult($item)) {
1751                         return false;
1752                 }
1753
1754                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1755
1756                 /*
1757                  * Diaspora uses their own hardwired link URL in @-tags
1758                  * instead of the one we supply with webfinger
1759                  */
1760                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
1761
1762                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1763                 if ($cnt) {
1764                         foreach ($matches as $mtch) {
1765                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
1766                                         $mention = true;
1767                                         Logger::log('mention found: ' . $mtch[2]);
1768                                 }
1769                         }
1770                 }
1771
1772                 if (!$mention) {
1773                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1774                         foreach ($tags as $tag) {
1775                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
1776                                         $mention = true;
1777                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
1778                                 }
1779                         }
1780                 }
1781
1782                 if (!$mention) {
1783                         if (($community_page || $prvgroup) &&
1784                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
1785                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item['id'], 'guid'=> $item['guid']]);
1786                                 Post\User::delete(['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1787                                 return true;
1788                         }
1789                         return false;
1790                 }
1791
1792                 $arr = ['item' => $item, 'user' => $user];
1793
1794                 Hook::callAll('tagged', $arr);
1795
1796                 if (!$community_page && !$prvgroup) {
1797                         return false;
1798                 }
1799
1800                 /*
1801                  * tgroup delivery - setup a second delivery chain
1802                  * prevent delivery looping - only proceed
1803                  * if the message originated elsewhere and is a top-level post
1804                  */
1805                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
1806                         return false;
1807                 }
1808
1809                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
1810                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
1811                 if (!DBA::isResult($self)) {
1812                         return false;
1813                 }
1814
1815                 $owner_id = Contact::getIdForURL($self['url']);
1816
1817                 // also reset all the privacy bits to the forum default permissions
1818
1819                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
1820
1821                 $psid = PermissionSet::getIdFromACL(
1822                         $user['uid'],
1823                         $user['allow_cid'],
1824                         $user['allow_gid'],
1825                         $user['deny_cid'],
1826                         $user['deny_gid']
1827                 );
1828
1829                 $forum_mode = ($prvgroup ? 2 : 1);
1830
1831                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
1832                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
1833                 self::update($fields, ['id' => $item['id']]);
1834
1835                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, (int)$item['uri-id'], (int)$item['uid']);
1836
1837                 self::performActivity($item['id'], 'announce', $uid);
1838
1839                 return false;
1840         }
1841
1842         /**
1843          * Automatically reshare the item if the "remote_self" option is selected
1844          *
1845          * @param array $item
1846          * @return void
1847          */
1848         private static function autoReshare(array $item)
1849         {
1850                 if ($item['gravity'] != GRAVITY_PARENT) {
1851                         return;
1852                 }
1853
1854                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
1855                         return;
1856                 }
1857
1858                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1859                         return;
1860                 }
1861
1862                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
1863
1864                 self::performActivity($item['id'], 'announce', $item['uid']);
1865         }
1866
1867         public static function isRemoteSelf($contact, &$datarray)
1868         {
1869                 if (!$contact['remote_self']) {
1870                         return false;
1871                 }
1872
1873                 // Prevent the forwarding of posts that are forwarded
1874                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
1875                         Logger::info('Already forwarded');
1876                         return false;
1877                 }
1878
1879                 // Prevent to forward already forwarded posts
1880                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
1881                         Logger::info('Already forwarded (second test)');
1882                         return false;
1883                 }
1884
1885                 // Only forward posts
1886                 if ($datarray["verb"] != Activity::POST) {
1887                         Logger::info('No post');
1888                         return false;
1889                 }
1890
1891                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
1892                         Logger::info('Not public');
1893                         return false;
1894                 }
1895
1896                 $datarray2 = $datarray;
1897                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
1898                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
1899                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
1900                                         ['uid' => $contact['uid'], 'self' => true]);
1901                         if (DBA::isResult($self)) {
1902                                 $datarray['contact-id'] = $self["id"];
1903
1904                                 $datarray['owner-name'] = $self["name"];
1905                                 $datarray['owner-link'] = $self["url"];
1906                                 $datarray['owner-avatar'] = $self["thumb"];
1907
1908                                 $datarray['author-name']   = $datarray['owner-name'];
1909                                 $datarray['author-link']   = $datarray['owner-link'];
1910                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
1911
1912                                 unset($datarray['edited']);
1913
1914                                 unset($datarray['network']);
1915                                 unset($datarray['owner-id']);
1916                                 unset($datarray['author-id']);
1917                         }
1918
1919                         if ($contact['network'] != Protocol::FEED) {
1920                                 $old_uri_id = $datarray["uri-id"] ?? 0;
1921                                 $datarray["guid"] = System::createUUID();
1922                                 unset($datarray["plink"]);
1923                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
1924                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
1925                                 $datarray["extid"] = Protocol::DFRN;
1926                                 $urlpart = parse_url($datarray2['author-link']);
1927                                 $datarray["app"] = $urlpart["host"];
1928                                 if (!empty($old_uri_id)) {
1929                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
1930                                 }
1931
1932                                 unset($datarray["parent-uri"]);
1933                                 unset($datarray["thr-parent"]);
1934                         } else {
1935                                 $datarray['private'] = self::PUBLIC;
1936                         }
1937                 }
1938
1939                 if ($contact['network'] != Protocol::FEED) {
1940                         // Store the original post
1941                         $result = self::insert($datarray2);
1942                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
1943                 } else {
1944                         $datarray["app"] = "Feed";
1945                         $result = true;
1946                 }
1947
1948                 // Trigger automatic reactions for addons
1949                 $datarray['api_source'] = true;
1950
1951                 // We have to tell the hooks who we are - this really should be improved
1952                 $_SESSION['authenticated'] = true;
1953                 $_SESSION['uid'] = $contact['uid'];
1954
1955                 return (bool)$result;
1956         }
1957
1958         /**
1959          *
1960          * @param string $s
1961          * @param int    $uid
1962          * @param array  $item
1963          * @param int    $cid
1964          * @return string
1965          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1966          * @throws \ImagickException
1967          */
1968         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
1969         {
1970                 if (DI::config()->get('system', 'disable_embedded')) {
1971                         return $s;
1972                 }
1973
1974                 Logger::info('check for photos');
1975                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
1976
1977                 $orig_body = $s;
1978                 $new_body = '';
1979
1980                 $img_start = strpos($orig_body, '[img');
1981                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
1982                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
1983
1984                 while (($img_st_close !== false) && ($img_len !== false)) {
1985                         $img_st_close++; // make it point to AFTER the closing bracket
1986                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
1987
1988                         Logger::info('found photo', ['image' => $image]);
1989
1990                         if (stristr($image, $site . '/photo/')) {
1991                                 // Only embed locally hosted photos
1992                                 $replace = false;
1993                                 $i = basename($image);
1994                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
1995                                 $x = strpos($i, '-');
1996
1997                                 if ($x) {
1998                                         $res = substr($i, $x + 1);
1999                                         $i = substr($i, 0, $x);
2000                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2001                                         if (DBA::isResult($photo)) {
2002                                                 /*
2003                                                  * Check to see if we should replace this photo link with an embedded image
2004                                                  * 1. No need to do so if the photo is public
2005                                                  * 2. If there's a contact-id provided, see if they're in the access list
2006                                                  *    for the photo. If so, embed it.
2007                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2008                                                  *    permissions, regardless of order but first check to see if they're an exact
2009                                                  *    match to save some processing overhead.
2010                                                  */
2011                                                 if (self::hasPermissions($photo)) {
2012                                                         if ($cid) {
2013                                                                 $recips = self::enumeratePermissions($photo);
2014                                                                 if (in_array($cid, $recips)) {
2015                                                                         $replace = true;
2016                                                                 }
2017                                                         } elseif ($item) {
2018                                                                 if (self::samePermissions($uid, $item, $photo)) {
2019                                                                         $replace = true;
2020                                                                 }
2021                                                         }
2022                                                 }
2023                                                 if ($replace) {
2024                                                         $photo_img = Photo::getImageForPhoto($photo);
2025                                                         // If a custom width and height were specified, apply before embedding
2026                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2027                                                                 Logger::info('scaling photo');
2028
2029                                                                 $width = intval($match[1]);
2030                                                                 $height = intval($match[2]);
2031
2032                                                                 $photo_img->scaleDown(max($width, $height));
2033                                                         }
2034
2035                                                         $data = $photo_img->asString();
2036                                                         $type = $photo_img->getType();
2037
2038                                                         Logger::info('replacing photo');
2039                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2040                                                         Logger::debug('replaced', ['image' => $image]);
2041                                                 }
2042                                         }
2043                                 }
2044                         }
2045
2046                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2047                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2048                         if ($orig_body === false) {
2049                                 $orig_body = '';
2050                         }
2051
2052                         $img_start = strpos($orig_body, '[img');
2053                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2054                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2055                 }
2056
2057                 $new_body = $new_body . $orig_body;
2058
2059                 return $new_body;
2060         }
2061
2062         private static function hasPermissions($obj)
2063         {
2064                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2065                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2066         }
2067
2068         private static function samePermissions($uid, $obj1, $obj2)
2069         {
2070                 // first part is easy. Check that these are exactly the same.
2071                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2072                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2073                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2074                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2075                         return true;
2076                 }
2077
2078                 // This is harder. Parse all the permissions and compare the resulting set.
2079                 $recipients1 = self::enumeratePermissions($obj1);
2080                 $recipients2 = self::enumeratePermissions($obj2);
2081                 sort($recipients1);
2082                 sort($recipients2);
2083
2084                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2085                 return ($recipients1 == $recipients2);
2086         }
2087
2088         /**
2089          * Returns an array of contact-ids that are allowed to see this object
2090          *
2091          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2092          * @param bool  $check_dead Prunes unavailable contacts from the result
2093          * @return array
2094          * @throws \Exception
2095          */
2096         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2097         {
2098                 $aclFormater = DI::aclFormatter();
2099
2100                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2101                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2102                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2103                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2104                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2105                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2106                 $recipients   = array_diff($recipients, $deny);
2107                 return $recipients;
2108         }
2109
2110         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2111         {
2112                 if (!$uid || ($days < 1)) {
2113                         return;
2114                 }
2115
2116                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2117                         $uid, GRAVITY_PARENT];
2118
2119                 /*
2120                  * $expire_network_only = save your own wall posts
2121                  * and just expire conversations started by others
2122                  */
2123                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2124
2125                 if ($expire_network_only) {
2126                         $condition[0] .= " AND NOT `wall`";
2127                 }
2128
2129                 if ($network != "") {
2130                         $condition[0] .= " AND `network` = ?";
2131                         $condition[] = $network;
2132                 }
2133
2134                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2135                 $condition[] = $days;
2136
2137                 $items = Post::select(['resource-id', 'starred', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2138
2139                 if (!DBA::isResult($items)) {
2140                         return;
2141                 }
2142
2143                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2144
2145                 // Forcing expiring of items - but not notes and marked items
2146                 if ($force) {
2147                         $expire_items = true;
2148                 }
2149
2150                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2151                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2152                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2153
2154                 $expired = 0;
2155
2156                 $priority = DI::config()->get('system', 'expire-notify-priority');
2157
2158                 while ($item = Post::fetch($items)) {
2159                         // don't expire filed items
2160                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2161                                 continue;
2162                         }
2163
2164                         // Only expire posts, not photos and photo comments
2165
2166                         if (!$expire_photos && !empty($item['resource-id'])) {
2167                                 continue;
2168                         } elseif (!$expire_starred && intval($item['starred'])) {
2169                                 continue;
2170                         } elseif (!$expire_notes && ($item['post-type'] == self::PT_PERSONAL_NOTE)) {
2171                                 continue;
2172                         } elseif (!$expire_items && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2173                                 continue;
2174                         }
2175
2176                         self::markForDeletionById($item['id'], $priority);
2177
2178                         ++$expired;
2179                 }
2180                 DBA::close($items);
2181                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2182         }
2183
2184         public static function firstPostDate($uid, $wall = false)
2185         {
2186                 $user = User::getById($uid, ['register_date']);
2187                 if (empty($user)) {
2188                         return false;
2189                 }
2190
2191                 $condition = ["`uid` = ? AND `wall` = ? AND NOT `deleted` AND `visible` AND `received` >= ?",
2192                         $uid, $wall, $user['register_date']];
2193                 $params = ['order' => ['received' => false]];
2194                 $thread = Post::selectFirstThread(['received'], $condition, $params);
2195                 if (DBA::isResult($thread)) {
2196                         $postdate = substr(DateTimeFormat::local($thread['received']), 0, 10);
2197                         return $postdate;
2198                 }
2199                 return false;
2200         }
2201
2202         /**
2203          * add/remove activity to an item
2204          *
2205          * Toggle activities as like,dislike,attend of an item
2206          *
2207          * @param int $item_id
2208          * @param string $verb
2209          *            Activity verb. One of
2210          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2211          *            attendno, unattendno, attendmaybe, unattendmaybe,
2212          *            announce, unannouce
2213          * @return bool
2214          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2215          * @throws \ImagickException
2216          * @hook  'post_local_end'
2217          *            array $arr
2218          *            'post_id' => ID of posted item
2219          */
2220         public static function performActivity(int $item_id, string $verb, int $uid)
2221         {
2222                 if (empty($uid)) {
2223                         return false;
2224                 }
2225
2226                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2227
2228                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2229                 if (!DBA::isResult($item)) {
2230                         Logger::log('like: unknown item ' . $item_id);
2231                         return false;
2232                 }
2233
2234                 $uri_id = $item['uri-id'];
2235
2236                 if (!in_array($item['uid'], [0, $uid])) {
2237                         return false;
2238                 }
2239
2240                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2241                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2242                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2243                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2244                                 if (!DBA::isResult($item)) {
2245                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'uri-id' => $uri_id]);
2246                                         return false;
2247                                 }
2248                         }
2249                 }
2250
2251                 // Retrieves the local post owner
2252                 $owner = User::getOwnerDataById($uid);
2253                 if (empty($owner)) {
2254                         Logger::info('Empty owner for user', ['uid' => $uid]);
2255                         return false;
2256                 }
2257
2258                 // Retrieve the current logged in user's public contact
2259                 $author_id = Contact::getIdForURL($owner['url']);
2260                 if (empty($author_id)) {
2261                         Logger::info('Empty public contact');
2262                         return false;
2263                 }
2264
2265                 $activity = null;
2266                 switch ($verb) {
2267                         case 'like':
2268                         case 'unlike':
2269                                 $activity = Activity::LIKE;
2270                                 break;
2271                         case 'dislike':
2272                         case 'undislike':
2273                                 $activity = Activity::DISLIKE;
2274                                 break;
2275                         case 'attendyes':
2276                         case 'unattendyes':
2277                                 $activity = Activity::ATTEND;
2278                                 break;
2279                         case 'attendno':
2280                         case 'unattendno':
2281                                 $activity = Activity::ATTENDNO;
2282                                 break;
2283                         case 'attendmaybe':
2284                         case 'unattendmaybe':
2285                                 $activity = Activity::ATTENDMAYBE;
2286                                 break;
2287                         case 'follow':
2288                         case 'unfollow':
2289                                 $activity = Activity::FOLLOW;
2290                                 break;
2291                         case 'announce':
2292                         case 'unannounce':
2293                                 $activity = Activity::ANNOUNCE;
2294                                 break;
2295                         default:
2296                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2297                                 return false;
2298                 }
2299
2300                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2301
2302                 // Enable activity toggling instead of on/off
2303                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2304
2305                 // Look for an existing verb row
2306                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2307                 if ($event_verb_flag) {
2308                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2309
2310                         // Translate to the index based activity index
2311                         $vids = [];
2312                         foreach ($verbs as $verb) {
2313                                 $vids[] = Verb::getID($verb);
2314                         }
2315                 } else {
2316                         $vids = Verb::getID($activity);
2317                 }
2318
2319                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2320                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent-id' => $uri_id];
2321                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2322
2323                 if (DBA::isResult($like_item)) {
2324                         /**
2325                          * Truth table for existing activities
2326                          *
2327                          * |          Inputs            ||      Outputs      |
2328                          * |----------------------------||-------------------|
2329                          * |  Mode  | Event | Same verb || Delete? | Return? |
2330                          * |--------|-------|-----------||---------|---------|
2331                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2332                          * | create |  Yes  |    No     ||   Yes   |   No    |
2333                          * | create |  No   |    Yes    ||   No    |   Yes   |
2334                          * | create |  No   |    No     ||        N/A†       |
2335                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2336                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2337                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2338                          * | delete |  No   |    No     ||        N/A†       |
2339                          * |--------|-------|-----------||---------|---------|
2340                          * |   A    |   B   |     C     || A xor C | !B or C |
2341                          *
2342                          * † Can't happen: It's impossible to find an existing non-event activity without
2343                          *                 the same verb because we are only looking for this single verb.
2344                          *
2345                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2346                          */
2347                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2348                                 self::markForDeletionById($like_item['id']);
2349                         }
2350
2351                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2352                                 return true;
2353                         }
2354                 }
2355
2356                 // No need to go further if we aren't creating anything
2357                 if ($mode == 'delete') {
2358                         return true;
2359                 }
2360
2361                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2362
2363                 $new_item = [
2364                         'guid'          => System::createUUID(),
2365                         'uri'           => self::newURI($item['uid']),
2366                         'uid'           => $item['uid'],
2367                         'contact-id'    => $owner['id'],
2368                         'wall'          => $item['wall'],
2369                         'origin'        => 1,
2370                         'network'       => Protocol::DFRN,
2371                         'protocol'      => Conversation::PARCEL_DIRECT,
2372                         'direction'     => Conversation::PUSH,
2373                         'gravity'       => GRAVITY_ACTIVITY,
2374                         'parent'        => $item['id'],
2375                         'thr-parent'    => $item['uri'],
2376                         'owner-id'      => $author_id,
2377                         'author-id'     => $author_id,
2378                         'body'          => $activity,
2379                         'verb'          => $activity,
2380                         'object-type'   => $objtype,
2381                         'allow_cid'     => $item['allow_cid'],
2382                         'allow_gid'     => $item['allow_gid'],
2383                         'deny_cid'      => $item['deny_cid'],
2384                         'deny_gid'      => $item['deny_gid'],
2385                         'visible'       => 1,
2386                         'unseen'        => 1,
2387                 ];
2388
2389                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2390                 if (!empty($signed)) {
2391                         $new_item['diaspora_signed_text'] = json_encode($signed);
2392                 }
2393
2394                 $new_item_id = self::insert($new_item);
2395
2396                 // If the parent item isn't visible then set it to visible
2397                 if (!$item['visible']) {
2398                         self::update(['visible' => true], ['id' => $item['id']]);
2399                 }
2400
2401                 $new_item['id'] = $new_item_id;
2402
2403                 Hook::callAll('post_local_end', $new_item);
2404
2405                 return true;
2406         }
2407
2408         /**
2409          * Fetch the SQL condition for the given user id
2410          *
2411          * @param integer $owner_id User ID for which the permissions should be fetched
2412          * @return array condition
2413          */
2414         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2415         {
2416                 $local_user = local_user();
2417                 $remote_user = Session::getRemoteContactID($owner_id);
2418
2419                 // default permissions - anonymous user
2420                 $condition = ["`private` != ?", self::PRIVATE];
2421
2422                 if ($local_user && ($local_user == $owner_id)) {
2423                         // Profile owner - everything is visible
2424                         $condition = [];
2425                 } elseif ($remote_user) {
2426                          // Authenticated visitor - fetch the matching permissionsets
2427                         $set = PermissionSet::get($owner_id, $remote_user);
2428                         if (!empty($set)) {
2429                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2430                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2431                                         self::PRIVATE, self::PRIVATE];
2432                                 $condition = array_merge($condition, $set);
2433                         }
2434                 }
2435
2436                 return $condition;
2437         }
2438
2439         /**
2440          * Get a permission SQL string for the given user
2441          *
2442          * @param int $owner_id
2443          * @param string $table
2444          * @return string
2445          */
2446         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2447         {
2448                 $local_user = local_user();
2449                 $remote_user = Session::getRemoteContactID($owner_id);
2450
2451                 if (!empty($table)) {
2452                         $table = DBA::quoteIdentifier($table) . '.';
2453                 }
2454
2455                 /*
2456                  * Construct permissions
2457                  *
2458                  * default permissions - anonymous user
2459                  */
2460                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2461
2462                 // Profile owner - everything is visible
2463                 if ($local_user && ($local_user == $owner_id)) {
2464                         $sql = '';
2465                 } elseif ($remote_user) {
2466                         /*
2467                          * Authenticated visitor. Unless pre-verified,
2468                          * check that the contact belongs to this $owner_id
2469                          * and load the groups the visitor belongs to.
2470                          * If pre-verified, the caller is expected to have already
2471                          * done this and passed the groups into this function.
2472                          */
2473                         $set = PermissionSet::get($owner_id, $remote_user);
2474
2475                         if (!empty($set)) {
2476                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2477                         } else {
2478                                 $sql_set = '';
2479                         }
2480
2481                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2482                 }
2483
2484                 return $sql;
2485         }
2486
2487         /**
2488          * get translated item type
2489          *
2490          * @param array                $item
2491          * @param \Friendica\Core\L10n $l10n
2492          * @return string
2493          */
2494         public static function postType(array $item, \Friendica\Core\L10n $l10n)
2495         {
2496                 if (!empty($item['event-id'])) {
2497                         return $l10n->t('event');
2498                 } elseif (!empty($item['resource-id'])) {
2499                         return $l10n->t('photo');
2500                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2501                         return $l10n->t('activity');
2502                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2503                         return $l10n->t('comment');
2504                 }
2505
2506                 return $l10n->t('post');
2507         }
2508
2509         /**
2510          * Sets the "rendered-html" field of the provided item
2511          *
2512          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2513          *
2514          * @param array $item
2515          *
2516          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2517          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2518          */
2519         public static function putInCache(&$item)
2520         {
2521                 // Save original body to prevent addons to modify it
2522                 $body = $item['body'];
2523
2524                 $rendered_hash = $item['rendered-hash'] ?? '';
2525                 $rendered_html = $item['rendered-html'] ?? '';
2526
2527                 if ($rendered_hash == ''
2528                         || $rendered_html == ''
2529                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2530                         || DI::config()->get('system', 'ignore_cache')
2531                 ) {
2532                         self::addRedirToImageTags($item);
2533
2534                         $item['rendered-html'] = BBCode::convert($item['body']);
2535                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2536
2537                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2538                         Hook::callAll('put_item_in_cache', $hook_data);
2539                         $item['rendered-html'] = $hook_data['rendered-html'];
2540                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2541                         unset($hook_data);
2542
2543                         // Update if the generated values differ from the existing ones
2544                         if ((($rendered_hash != $item['rendered-hash']) || ($rendered_html != $item['rendered-html'])) && !empty($item['id'])) {
2545                                 self::update(
2546                                         [
2547                                                 'rendered-html' => $item['rendered-html'],
2548                                                 'rendered-hash' => $item['rendered-hash']
2549                                         ],
2550                                         ['id' => $item['id']]
2551                                 );
2552                         }
2553                 }
2554
2555                 $item['body'] = $body;
2556         }
2557
2558         /**
2559          * Find any non-embedded images in private items and add redir links to them
2560          *
2561          * @param array &$item The field array of an item row
2562          */
2563         private static function addRedirToImageTags(array &$item)
2564         {
2565                 $app = DI::app();
2566
2567                 $matches = [];
2568                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2569                 if ($cnt) {
2570                         foreach ($matches as $mtch) {
2571                                 if (strpos($mtch[1], '/redir') !== false) {
2572                                         continue;
2573                                 }
2574
2575                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2576                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2577                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2578                                 }
2579                         }
2580                 }
2581         }
2582
2583         /**
2584          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2585          * If attach is true, also add icons for item attachments.
2586          *
2587          * @param array   $item
2588          * @param boolean $attach
2589          * @param boolean $is_preview
2590          * @return string item body html
2591          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2592          * @throws \ImagickException
2593          * @hook  prepare_body_init item array before any work
2594          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2595          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2596          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2597          */
2598         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2599         {
2600                 $a = DI::app();
2601                 Hook::callAll('prepare_body_init', $item);
2602
2603                 // In order to provide theme developers more possibilities, event items
2604                 // are treated differently.
2605                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2606                         $ev = Event::getItemHTML($item);
2607                         return $ev;
2608                 }
2609
2610                 $tags = Tag::populateFromItem($item);
2611
2612                 $item['tags'] = $tags['tags'];
2613                 $item['hashtags'] = $tags['hashtags'];
2614                 $item['mentions'] = $tags['mentions'];
2615
2616                 // Compile eventual content filter reasons
2617                 $filter_reasons = [];
2618                 if (!$is_preview && public_contact() != $item['author-id']) {
2619                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2620                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2621                         }
2622
2623                         $hook_data = [
2624                                 'item' => $item,
2625                                 'filter_reasons' => $filter_reasons
2626                         ];
2627                         Hook::callAll('prepare_body_content_filter', $hook_data);
2628                         $filter_reasons = $hook_data['filter_reasons'];
2629                         unset($hook_data);
2630                 }
2631
2632                 self::putInCache($item);
2633                 $s = $item["rendered-html"];
2634
2635                 $hook_data = [
2636                         'item' => $item,
2637                         'html' => $s,
2638                         'preview' => $is_preview,
2639                         'filter_reasons' => $filter_reasons
2640                 ];
2641                 Hook::callAll('prepare_body', $hook_data);
2642                 $s = $hook_data['html'];
2643                 unset($hook_data);
2644
2645                 if (!$attach) {
2646                         // Replace the blockquotes with quotes that are used in mails.
2647                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2648                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2649                         return $s;
2650                 }
2651
2652                 $s = self::addMediaAttachments($item, $s);
2653
2654                 // Map.
2655                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2656                         $x = Map::byCoordinates(trim($item['coord']));
2657                         if ($x) {
2658                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2659                         }
2660                 }
2661
2662                 // Replace friendica image url size with theme preference.
2663                 if (!empty($a->theme_info['item_image_size'])) {
2664                         $ps = $a->theme_info['item_image_size'];
2665                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2666                 }
2667
2668                 $s = HTML::applyContentFilter($s, $filter_reasons);
2669
2670                 $hook_data = ['item' => $item, 'html' => $s];
2671                 Hook::callAll('prepare_body_final', $hook_data);
2672
2673                 return $hook_data['html'];
2674         }
2675
2676         /**
2677          * Add media attachments to the content
2678          *
2679          * @param array $item
2680          * @param string $content
2681          * @return modified content
2682          */
2683         private static function addMediaAttachments(array $item, string $content)
2684         {
2685                 $leading = '';
2686                 $trailing = '';
2687                 // currently deactivated the request for Post\Media::VIDEO since it creates mutliple videos from Peertube
2688                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::AUDIO,
2689                         Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2690                         if (in_array($attachment['type'], [Post\Media::AUDIO, Post\Media::VIDEO]) && strpos($item['body'], $attachment['url'])) {
2691                                 continue;
2692                         }
2693
2694                         $mime = $attachment['mimetype'];
2695
2696                         $author = ['uid' => 0, 'id' => $item['author-id'],
2697                                 'network' => $item['author-network'], 'url' => $item['author-link']];
2698                         $the_url = Contact::magicLinkByContact($author, $attachment['url']);
2699
2700                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2701                         if ($filetype) {
2702                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
2703                                 $filesubtype = str_replace('.', '-', $filesubtype);
2704                         } else {
2705                                 $filetype = 'unkn';
2706                                 $filesubtype = 'unkn';
2707                         }
2708
2709                         if (($filetype == 'video')) {
2710                                 /// @todo Move the template to /content as well
2711                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2712                                         '$video' => [
2713                                                 'id'     => $item['author-id'],
2714                                                 'src'    => $the_url,
2715                                                 'mime'   => $mime,
2716                                         ],
2717                                 ]);
2718                                 if ($item['post-type'] == Item::PT_VIDEO) {
2719                                         $leading .= $media;
2720                                 } else {
2721                                         $trailing .= $media;
2722                                 }
2723                         } elseif ($filetype == 'audio') {
2724                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('content/audio.tpl'), [
2725                                         '$audio' => [
2726                                                 'id'     => $item['author-id'],
2727                                                 'src'    => $the_url,
2728                                                 'mime'   => $mime,
2729                                         ],
2730                                 ]);
2731                                 if ($item['post-type'] == Item::PT_AUDIO) {
2732                                         $leading .= $media;
2733                                 } else {
2734                                         $trailing .= $media;
2735                                 }
2736                         } else {
2737                                 $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
2738
2739                                 if (!empty($attachment['size'])) {
2740                                         $title .= ' ' . $attachment['size'] . ' ' . DI::l10n()->t('bytes');
2741                                 }
2742
2743                                 /// @todo Use a template
2744                                 $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
2745                                 $trailing .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
2746                         }
2747                 }
2748
2749                 if ($leading != '') {
2750                         $content = '<div class="body-attach">' . $leading . '<div class="clear"></div></div>' . $content;
2751                 }
2752
2753                 if ($trailing != '') {
2754                         $content .= '<div class="body-attach">' . $trailing . '<div class="clear"></div></div>';
2755                 }
2756
2757                 return $content;
2758         }
2759
2760         /**
2761          * get private link for item
2762          *
2763          * @param array $item
2764          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
2765          * @throws \Exception
2766          */
2767         public static function getPlink($item)
2768         {
2769                 if (local_user()) {
2770                         $ret = [
2771                                 'href' => "display/" . $item['guid'],
2772                                 'orig' => "display/" . $item['guid'],
2773                                 'title' => DI::l10n()->t('View on separate page'),
2774                                 'orig_title' => DI::l10n()->t('view on separate page'),
2775                         ];
2776
2777                         if (!empty($item['plink'])) {
2778                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
2779                                 $ret["title"] = DI::l10n()->t('link to source');
2780                         }
2781                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
2782                         $ret = [
2783                                 'href' => $item['plink'],
2784                                 'orig' => $item['plink'],
2785                                 'title' => DI::l10n()->t('link to source'),
2786                         ];
2787                 } else {
2788                         $ret = [];
2789                 }
2790
2791                 return $ret;
2792         }
2793
2794         /**
2795          * Is the given item array a post that is sent as starting post to a forum?
2796          *
2797          * @param array $item
2798          * @param array $owner
2799          *
2800          * @return boolean "true" when it is a forum post
2801          */
2802         public static function isForumPost(array $item, array $owner = [])
2803         {
2804                 if (empty($owner)) {
2805                         $owner = User::getOwnerDataById($item['uid']);
2806                         if (empty($owner)) {
2807                                 return false;
2808                         }
2809                 }
2810
2811                 if (($item['author-id'] == $item['owner-id']) ||
2812                         ($owner['id'] == $item['contact-id']) ||
2813                         ($item['uri-id'] != $item['parent-uri-id']) ||
2814                         $item['origin']) {
2815                         return false;
2816                 }
2817
2818                 return Contact::isForum($item['contact-id']);
2819         }
2820
2821         /**
2822          * Search item id for given URI or plink
2823          *
2824          * @param string $uri
2825          * @param integer $uid
2826          *
2827          * @return integer item id
2828          */
2829         public static function searchByLink($uri, $uid = 0)
2830         {
2831                 $ssl_uri = str_replace('http://', 'https://', $uri);
2832                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2833
2834                 $item = Post::selectFirst(['id'], ['uri' => $uris, 'uid' => $uid]);
2835                 if (DBA::isResult($item)) {
2836                         return $item['id'];
2837                 }
2838
2839                 $item = Post::selectFirst(['id'], ['plink' => $uris, 'uid' => $uid]);
2840                 if (DBA::isResult($item)) {
2841                         return $item['id'];
2842                 }
2843
2844                 return 0;
2845         }
2846
2847         /**
2848          * Return the URI for a link to the post
2849          *
2850          * @param string $uri URI or link to post
2851          *
2852          * @return string URI
2853          */
2854         public static function getURIByLink(string $uri)
2855         {
2856                 $ssl_uri = str_replace('http://', 'https://', $uri);
2857                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2858
2859                 $item = Post::selectFirst(['uri'], ['uri' => $uris]);
2860                 if (DBA::isResult($item)) {
2861                         return $item['uri'];
2862                 }
2863
2864                 $item = Post::selectFirst(['uri'], ['plink' => $uris]);
2865                 if (DBA::isResult($item)) {
2866                         return $item['uri'];
2867                 }
2868
2869                 return '';
2870         }
2871
2872         /**
2873          * Fetches item for given URI or plink
2874          *
2875          * @param string $uri
2876          * @param integer $uid
2877          *
2878          * @return integer item id
2879          */
2880         public static function fetchByLink(string $uri, int $uid = 0)
2881         {
2882                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
2883                 $item_id = self::searchByLink($uri, $uid);
2884                 if (!empty($item_id)) {
2885                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2886                         return $item_id;
2887                 }
2888
2889                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
2890                         $item_id = self::searchByLink($fetched_uri, $uid);
2891                 } else {
2892                         $item_id = Diaspora::fetchByURL($uri);
2893                 }
2894
2895                 if (!empty($item_id)) {
2896                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2897                         return $item_id;
2898                 }
2899
2900                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
2901                 return 0;
2902         }
2903
2904         /**
2905          * Return share data from an item array (if the item is shared item)
2906          * We are providing the complete Item array, because at some time in the future
2907          * we hopefully will define these values not in the body anymore but in some item fields.
2908          * This function is meant to replace all similar functions in the system.
2909          *
2910          * @param array $item
2911          *
2912          * @return array with share information
2913          */
2914         public static function getShareArray($item)
2915         {
2916                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
2917                         return [];
2918                 }
2919
2920                 $attribute_string = $matches[2];
2921                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
2922                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
2923                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
2924                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
2925                         }
2926                 }
2927                 return $attributes;
2928         }
2929
2930         /**
2931          * Fetch item information for shared items from the original items and adds it.
2932          *
2933          * @param array $item
2934          *
2935          * @return array item array with data from the original item
2936          */
2937         public static function addShareDataFromOriginal(array $item)
2938         {
2939                 $shared = self::getShareArray($item);
2940                 if (empty($shared)) {
2941                         return $item;
2942                 }
2943
2944                 // Real reshares always have got a GUID.
2945                 if (empty($shared['guid'])) {
2946                         return $item;
2947                 }
2948
2949                 $uid = $item['uid'] ?? 0;
2950
2951                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
2952                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
2953                 if (!DBA::isResult($shared_item)) {
2954                         if (empty($shared['link'])) {
2955                                 return $item;
2956                         }
2957
2958                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
2959                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
2960                         if (empty($id)) {
2961                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
2962                                 return $item;
2963                         }
2964
2965                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
2966                         if (!DBA::isResult($shared_item)) {
2967                                 return $item;
2968                         }
2969                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
2970                 } else {
2971                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
2972                 }
2973
2974                 if (!empty($shared_item['title'])) {
2975                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
2976                         unset($shared_item['title']);
2977                 } else {
2978                         $body = $shared_item['body'];
2979                 }
2980
2981                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
2982                 unset($shared_item['body']);
2983
2984                 return array_merge($item, $shared_item);
2985         }
2986
2987         /**
2988          * Check a prospective item array against user-level permissions
2989          *
2990          * @param array $item Expected keys: uri, gravity, and
2991          *                    author-link if is author-id is set,
2992          *                    owner-link if is owner-id is set,
2993          *                    causer-link if is causer-id is set.
2994          * @param int   $user_id Local user ID
2995          * @return bool
2996          * @throws \Exception
2997          */
2998         protected static function isAllowedByUser(array $item, int $user_id)
2999         {
3000                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3001                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3002                         return false;
3003                 }
3004
3005                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3006                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3007                         return false;
3008                 }
3009
3010                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3011                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3012                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3013                         return false;
3014                 }
3015
3016                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3017                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3018                         return false;
3019                 }
3020
3021                 return true;
3022         }
3023 }