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['extid']) && empty($fields['external-id'])) {
 154                         $fields['external-id'] = ItemURI::getIdByURI($fields['extid']);
 155                 }
 156
 157                 if (!empty($fields['verb'])) {
 158                         $fields['vid'] = Verb::getID($fields['verb']);
 159                 }
 160
 161                 $rows = Post::update($fields, $condition);
 162                 if (is_bool($rows)) {
 163                         return $rows;
 164                 }
 165
 166                 // We only need to call the line by line update for specific fields
 167                 if (empty($fields['body']) && empty($fields['file']) &&
 168                         empty($fields['attach']) && empty($fields['edited'])) {
 169                         return $rows;
 170                 }
 171
 172                 Logger::info('Updating per single row method', ['fields' => $fields, 'condition' => $condition]);
 173
 174                 $items = Post::select(['id', 'origin', 'uri-id', 'uid'], $condition);
 175
 176                 $notify_items = [];
 177
 178                 while ($item = DBA::fetch($items)) {
 179                         if (!empty($fields['body'])) {
 180                                 $content_fields = ['raw-body' => trim($fields['raw-body'] ?? $fields['body'])];
 181
 182                                 // Remove all media attachments from the body and store them in the post-media table
 183                                 $content_fields['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $content_fields['raw-body']);
 184                                 $content_fields['raw-body'] = self::setHashtags($content_fields['raw-body']);
 185                         }
 186
 187                         if (!empty($fields['file'])) {
 188                                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $fields['file']);
 189                         }
 190
 191                         if (!empty($fields['attach'])) {
 192                                 Post\Media::insertFromAttachment($item['uri-id'], $fields['attach']);
 193                         }
 194
 195                         // We only need to notfiy others when it is an original entry from us.
 196                         // Only call the notifier when the item has some content relevant change.
 197                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
 198                                 $notify_items[] = $item['id'];
 199                         }
 200                 }
 201
 202                 DBA::close($items);
 203
 204                 foreach ($notify_items as $notify_item) {
 205                         $post = Post::selectFirst(['uri-id', 'uid'], ['id' => $notify_item]);
 206                         Worker::add(PRIORITY_HIGH, "Notifier", Delivery::POST, (int)$post['uri-id'], (int)$post['uid']);
 207                 }
 208
 209                 return $rows;
 210         }
 211
 212         /**
 213          * Delete an item and notify others about it - if it was ours
 214          *
 215          * @param array   $condition The condition for finding the item entries
 216          * @param integer $priority  Priority for the notification
 217          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 218          */
 219         public static function markForDeletion($condition, $priority = PRIORITY_HIGH)
 220         {
 221                 $items = Post::select(['id'], $condition);
 222                 while ($item = Post::fetch($items)) {
 223                         self::markForDeletionById($item['id'], $priority);
 224                 }
 225                 DBA::close($items);
 226         }
 227
 228         /**
 229          * Delete an item for an user and notify others about it - if it was ours
 230          *
 231          * @param array   $condition The condition for finding the item entries
 232          * @param integer $uid       User who wants to delete this item
 233          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 234          */
 235         public static function deleteForUser($condition, $uid)
 236         {
 237                 if ($uid == 0) {
 238                         return;
 239                 }
 240
 241                 $items = Post::select(['id', 'uid', 'uri-id'], $condition);
 242                 while ($item = Post::fetch($items)) {
 243                         if (in_array($item['uid'], [$uid, 0])) {
 244                                 Post\User::update($item['uri-id'], $uid, ['hidden' => true], true);
 245                                 Post\ThreadUser::update($item['uri-id'], $uid, ['hidden' => true], true);
 246                         }
 247
 248                         if ($item['uid'] == $uid) {
 249                                 self::markForDeletionById($item['id'], PRIORITY_HIGH);
 250                         } elseif ($item['uid'] != 0) {
 251                                 Logger::notice('Wrong ownership. Not deleting item', ['id' => $item['id']]);
 252                         }
 253                 }
 254                 DBA::close($items);
 255         }
 256
 257         /**
 258          * Mark an item for deletion, delete related data and notify others about it - if it was ours
 259          *
 260          * @param integer $item_id
 261          * @param integer $priority Priority for the notification
 262          *
 263          * @return boolean success
 264          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 265          */
 266         public static function markForDeletionById($item_id, $priority = PRIORITY_HIGH)
 267         {
 268                 Logger::info('Mark item for deletion by id', ['id' => $item_id, 'callstack' => System::callstack()]);
 269                 // locate item to be deleted
 270                 $fields = ['id', 'uri', 'uri-id', 'uid', 'parent', 'parent-uri-id', 'origin',
 271                         'deleted', 'resource-id', 'event-id',
 272                         'verb', 'object-type', 'object', 'target', 'contact-id', 'psid', 'gravity'];
 273                 $item = Post::selectFirst($fields, ['id' => $item_id]);
 274                 if (!DBA::isResult($item)) {
 275                         Logger::info('Item not found.', ['id' => $item_id]);
 276                         return false;
 277                 }
 278
 279                 if ($item['deleted']) {
 280                         Logger::info('Item has already been marked for deletion.', ['id' => $item_id]);
 281                         return false;
 282                 }
 283
 284                 $parent = Post::selectFirst(['origin'], ['id' => $item['parent']]);
 285                 if (!DBA::isResult($parent)) {
 286                         $parent = ['origin' => false];
 287                 }
 288
 289                 // clean up categories and tags so they don't end up as orphans
 290                 Post\Category::deleteByURIId($item['uri-id'], $item['uid']);
 291
 292                 /*
 293                  * If item is a link to a photo resource, nuke all the associated photos
 294                  * (visitors will not have photo resources)
 295                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 296                  * generate a resource-id and therefore aren't intimately linked to the item.
 297                  */
 298                 /// @TODO: this should first check if photo is used elsewhere
 299                 if (strlen($item['resource-id'])) {
 300                         Photo::delete(['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 301                 }
 302
 303                 // If item is a link to an event, delete the event.
 304                 if (intval($item['event-id'])) {
 305                         Event::delete($item['event-id']);
 306                 }
 307
 308                 // If item has attachments, drop them
 309                 $attachments = Post\Media::getByURIId($item['uri-id'], [Post\Media::DOCUMENT]);
 310                 foreach($attachments as $attachment) {
 311                         if (preg_match("|attach/(\d+)|", $attachment['url'], $matches)) {
 312                                 Attach::delete(['id' => $matches[1], 'uid' => $item['uid']]);
 313                         }
 314                 }
 315
 316                 // Set the item to "deleted"
 317                 $item_fields = ['deleted' => true, 'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
 318                 Post::update($item_fields, ['id' => $item['id']]);
 319
 320                 Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], '');
 321
 322                 if (!Post::exists(["`uri-id` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri-id']])) {
 323                         self::markForDeletion(['uri-id' => $item['uri-id'], 'uid' => 0, 'deleted' => false], $priority);
 324                 }
 325
 326                 Post\DeliveryData::delete($item['uri-id']);
 327
 328                 // If it's the parent of a comment thread, kill all the kids
 329                 if ($item['gravity'] == GRAVITY_PARENT) {
 330                         self::markForDeletion(['parent' => $item['parent'], 'deleted' => false], $priority);
 331                 }
 332
 333                 // Is it our comment and/or our thread?
 334                 if (($item['origin'] || $parent['origin']) && ($item['uid'] != 0)) {
 335                         // When we delete the original post we will delete all existing copies on the server as well
 336                         self::markForDeletion(['uri-id' => $item['uri-id'], 'deleted' => false], $priority);
 337
 338                         // send the notification upstream/downstream
 339                         if ($priority) {
 340                                 Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", Delivery::DELETION, (int)$item['uri-id'], (int)$item['uid']);
 341                         }
 342                 } elseif ($item['uid'] != 0) {
 343                         Post\User::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 344                         Post\ThreadUser::update($item['uri-id'], $item['uid'], ['hidden' => true]);
 345                 }
 346
 347                 Logger::info('Item has been marked for deletion.', ['id' => $item_id]);
 348
 349                 return true;
 350         }
 351
 352         private static function guid($item, $notify)
 353         {
 354                 if (!empty($item['guid'])) {
 355                         return Strings::escapeTags(trim($item['guid']));
 356                 }
 357
 358                 if ($notify) {
 359                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 360                         // We add the hash of our own host because our host is the original creator of the post.
 361                         $prefix_host = DI::baseUrl()->getHostname();
 362                 } else {
 363                         $prefix_host = '';
 364
 365                         // We are only storing the post so we create a GUID from the original hostname.
 366                         if (!empty($item['author-link'])) {
 367                                 $parsed = parse_url($item['author-link']);
 368                                 if (!empty($parsed['host'])) {
 369                                         $prefix_host = $parsed['host'];
 370                                 }
 371                         }
 372
 373                         if (empty($prefix_host) && !empty($item['plink'])) {
 374                                 $parsed = parse_url($item['plink']);
 375                                 if (!empty($parsed['host'])) {
 376                                         $prefix_host = $parsed['host'];
 377                                 }
 378                         }
 379
 380                         if (empty($prefix_host) && !empty($item['uri'])) {
 381                                 $parsed = parse_url($item['uri']);
 382                                 if (!empty($parsed['host'])) {
 383                                         $prefix_host = $parsed['host'];
 384                                 }
 385                         }
 386
 387                         // Is it in the format data@host.tld? - Used for mail contacts
 388                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 389                                 $mailparts = explode('@', $item['author-link']);
 390                                 $prefix_host = array_pop($mailparts);
 391                         }
 392                 }
 393
 394                 if (!empty($item['plink'])) {
 395                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 396                 } elseif (!empty($item['uri'])) {
 397                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 398                 } else {
 399                         $guid = System::createUUID(hash('crc32', $prefix_host));
 400                 }
 401
 402                 return $guid;
 403         }
 404
 405         private static function contactId($item)
 406         {
 407                 if (!empty($item['contact-id']) && DBA::exists('contact', ['self' => true, 'id' => $item['contact-id']])) {
 408                         return $item['contact-id'];
 409                 } elseif (($item['gravity'] == GRAVITY_PARENT) && !empty($item['uid']) && !empty($item['contact-id']) && Contact::isSharing($item['contact-id'], $item['uid'])) {
 410                         return $item['contact-id'];
 411                 } elseif (!empty($item['uid']) && !Contact::isSharing($item['author-id'], $item['uid'])) {
 412                         return $item['author-id'];
 413                 } elseif (!empty($item['contact-id'])) {
 414                         return $item['contact-id'];
 415                 } else {
 416                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 417                         if (!empty($contact_id)) {
 418                                 return $contact_id;
 419                         }
 420                 }
 421                 return $item['author-id'];
 422         }
 423
 424         /**
 425          * Write an item array into a spool file to be inserted later.
 426          * This command is called whenever there are issues storing an item.
 427          *
 428          * @param array $item The item fields that are to be inserted
 429          * @throws \Exception
 430          */
 431         private static function spool($orig_item)
 432         {
 433                 // Now we store the data in the spool directory
 434                 // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 435                 $file = 'item-' . round(microtime(true) * 10000) . '-' . mt_rand() . '.msg';
 436
 437                 $spoolpath = get_spoolpath();
 438                 if ($spoolpath != "") {
 439                         $spool = $spoolpath . '/' . $file;
 440
 441                         file_put_contents($spool, json_encode($orig_item));
 442                         Logger::warning("Item wasn't stored - Item was spooled into file", ['file' => $file]);
 443                 }
 444         }
 445
 446         /**
 447          * Check if the item array is a duplicate
 448          *
 449          * @param array $item
 450          * @return boolean is it a duplicate?
 451          */
 452         private static function isDuplicate(array $item)
 453         {
 454                 // Checking if there is already an item with the same guid
 455                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 456                 if (Post::exists($condition)) {
 457                         Logger::notice('Found already existing item', [
 458                                 'guid' => $item['guid'],
 459                                 'uid' => $item['uid'],
 460                                 'network' => $item['network']
 461                         ]);
 462                         return true;
 463                 }
 464
 465                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid'],
 466                         'network' => [$item['network'], Protocol::DFRN]];
 467                 if (Post::exists($condition)) {
 468                         Logger::notice('duplicated item with the same uri found.', $item);
 469                         return true;
 470                 }
 471
 472                 // On Friendica and Diaspora the GUID is unique
 473                 if (in_array($item['network'], [Protocol::DFRN, Protocol::DIASPORA])) {
 474                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 475                         if (Post::exists($condition)) {
 476                                 Logger::notice('duplicated item with the same guid found.', $item);
 477                                 return true;
 478                         }
 479                 } elseif ($item['network'] == Protocol::OSTATUS) {
 480                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 481                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 482                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 483                         if (Post::exists($condition)) {
 484                                 Logger::notice('duplicated item with the same body found.', $item);
 485                                 return true;
 486                         }
 487                 }
 488
 489                 /*
 490                  * Check for already added items.
 491                  * There is a timing issue here that sometimes creates double postings.
 492                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 493                  */
 494                 if (($item['uid'] == 0) && Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
 495                         Logger::notice('Global item already stored.', ['uri-id' => $item['uri-id'], 'network' => $item['network']]);
 496                         return true;
 497                 }
 498
 499                 return false;
 500         }
 501
 502         /**
 503          * Check if the item array is valid
 504          *
 505          * @param array $item
 506          * @return boolean item is valid
 507          */
 508         public static function isValid(array $item)
 509         {
 510                 // When there is no content then we don't post it
 511                 if ($item['body'] . $item['title'] == '') {
 512                         Logger::notice('No body, no title.');
 513                         return false;
 514                 }
 515
 516                 if (!empty($item['uid'])) {
 517                         $owner = User::getOwnerDataById($item['uid'], false);
 518                         if (!$owner) {
 519                                 Logger::notice('Missing item user owner data', ['uid' => $item['uid']]);
 520                                 return false;
 521                         }
 522
 523                         if ($owner['account_expired'] || $owner['account_removed']) {
 524                                 Logger::notice('Item user has been deleted/expired/removed', ['uid' => $item['uid'], 'deleted' => $owner['deleted'], 'account_expired' => $owner['account_expired'], 'account_removed' => $owner['account_removed']]);
 525                                 return false;
 526                         }
 527                 }
 528
 529                 if (!empty($item['author-id']) && Contact::isBlocked($item['author-id'])) {
 530                         Logger::notice('Author is blocked node-wide', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 531                         return false;
 532                 }
 533
 534                 if (!empty($item['author-link']) && Network::isUrlBlocked($item['author-link'])) {
 535                         Logger::notice('Author server is blocked', ['author-link' => $item['author-link'], 'item-uri' => $item['uri']]);
 536                         return false;
 537                 }
 538
 539                 if (!empty($item['owner-id']) && Contact::isBlocked($item['owner-id'])) {
 540                         Logger::notice('Owner is blocked node-wide', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 541                         return false;
 542                 }
 543
 544                 if (!empty($item['owner-link']) && Network::isUrlBlocked($item['owner-link'])) {
 545                         Logger::notice('Owner server is blocked', ['owner-link' => $item['owner-link'], 'item-uri' => $item['uri']]);
 546                         return false;
 547                 }
 548
 549                 if (!empty($item['uid']) && !self::isAllowedByUser($item, $item['uid'])) {
 550                         return false;
 551                 }
 552
 553                 if ($item['verb'] == Activity::FOLLOW) {
 554                         if (!$item['origin'] && ($item['author-id'] == Contact::getPublicIdByUserId($item['uid']))) {
 555                                 // Our own follow request can be relayed to us. We don't store it to avoid notification chaos.
 556                                 Logger::info("Follow: Don't store not origin follow request", ['parent-uri' => $item['parent-uri']]);
 557                                 return false;
 558                         }
 559
 560                         $condition = ['verb' => Activity::FOLLOW, 'uid' => $item['uid'],
 561                                 'parent-uri' => $item['parent-uri'], 'author-id' => $item['author-id']];
 562                         if (Post::exists($condition)) {
 563                                 // It happens that we receive multiple follow requests by the same author - we only store one.
 564                                 Logger::info('Follow: Found existing follow request from author', ['author-id' => $item['author-id'], 'parent-uri' => $item['parent-uri']]);
 565                                 return false;
 566                         }
 567                 }
 568
 569                 return true;
 570         }
 571
 572         /**
 573          * Check if the item array is too old
 574          *
 575          * @param array $item
 576          * @return boolean item is too old
 577          */
 578         public static function isTooOld(array $item)
 579         {
 580                 // check for create date and expire time
 581                 $expire_interval = DI::config()->get('system', 'dbclean-expire-days', 0);
 582
 583                 $user = DBA::selectFirst('user', ['expire'], ['uid' => $item['uid']]);
 584                 if (DBA::isResult($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 585                         $expire_interval = $user['expire'];
 586                 }
 587
 588                 if (($expire_interval > 0) && !empty($item['created'])) {
 589                         $expire_date = time() - ($expire_interval * 86400);
 590                         $created_date = strtotime($item['created']);
 591                         if ($created_date < $expire_date) {
 592                                 Logger::notice('Item created before expiration interval.', [
 593                                         'created' => date('c', $created_date),
 594                                         'expired' => date('c', $expire_date),
 595                                         '$item' => $item
 596                                 ]);
 597                                 return true;
 598                         }
 599                 }
 600
 601                 return false;
 602         }
 603
 604         /**
 605          * Return the id of the given item array if it has been stored before
 606          *
 607          * @param array $item
 608          * @return integer item id
 609          */
 610         private static function getDuplicateID(array $item)
 611         {
 612                 if (empty($item['network']) || in_array($item['network'], Protocol::FEDERATED)) {
 613                         $condition = ["`uri-id` = ? AND `uid` = ? AND `network` IN (?, ?, ?, ?)",
 614                                 $item['uri-id'], $item['uid'],
 615                                 Protocol::ACTIVITYPUB, Protocol::DIASPORA, Protocol::DFRN, Protocol::OSTATUS];
 616                         $existing = Post::selectFirst(['id', 'network'], $condition);
 617                         if (DBA::isResult($existing)) {
 618                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 619                                 if ($item['uid'] != 0) {
 620                                         Logger::notice('Item already existed for user', [
 621                                                 'uri-id' => $item['uri-id'],
 622                                                 'uid' => $item['uid'],
 623                                                 'network' => $item['network'],
 624                                                 'existing_id' => $existing["id"],
 625                                                 'existing_network' => $existing["network"]
 626                                         ]);
 627                                 }
 628
 629                                 return $existing["id"];
 630                         }
 631                 }
 632                 return 0;
 633         }
 634
 635         /**
 636          * Fetch top-level parent data for the given item array
 637          *
 638          * @param array $item
 639          * @return array item array with parent data
 640          * @throws \Exception
 641          */
 642         private static function getTopLevelParent(array $item)
 643         {
 644                 $fields = ['uid', 'uri', 'parent-uri', 'id', 'deleted',
 645                         'uri-id', 'parent-uri-id',
 646                         'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 647                         'wall', 'private', 'forum_mode', 'origin', 'author-id'];
 648                 $condition = ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']];
 649                 $params = ['order' => ['id' => false]];
 650                 $parent = Post::selectFirst($fields, $condition, $params);
 651
 652                 if (!DBA::isResult($parent)) {
 653                         Logger::notice('item parent was not found - ignoring item', ['thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
 654                         return [];
 655                 }
 656
 657                 if ($parent['uri-id'] == $parent['parent-uri-id']) {
 658                         return $parent;
 659                 }
 660
 661                 $condition = ['uri-id' => $parent['parent-uri-id'],
 662                         'parent-uri-id' => $parent['parent-uri-id'],
 663                         'uid' => $parent['uid']];
 664                 $params = ['order' => ['id' => false]];
 665                 $toplevel_parent = Post::selectFirst($fields, $condition, $params);
 666                 if (!DBA::isResult($toplevel_parent)) {
 667                         Logger::notice('item top level parent was not found - ignoring item', ['parent-uri-id' => $parent['parent-uri-id'], 'uid' => $parent['uid']]);
 668                         return [];
 669                 }
 670
 671                 return $toplevel_parent;
 672         }
 673
 674         /**
 675          * Get the gravity for the given item array
 676          *
 677          * @param array $item
 678          * @return integer gravity
 679          */
 680         private static function getGravity(array $item)
 681         {
 682                 $activity = DI::activity();
 683
 684                 if (isset($item['gravity'])) {
 685                         return intval($item['gravity']);
 686                 } elseif ($item['parent-uri-id'] === $item['uri-id']) {
 687                         return GRAVITY_PARENT;
 688                 } elseif ($activity->match($item['verb'], Activity::POST)) {
 689                         return GRAVITY_COMMENT;
 690                 } elseif ($activity->match($item['verb'], Activity::FOLLOW)) {
 691                         return GRAVITY_ACTIVITY;
 692                 } elseif ($activity->match($item['verb'], Activity::ANNOUNCE)) {
 693                         return GRAVITY_ACTIVITY;
 694                 }
 695                 Logger::info('Unknown gravity for verb', ['verb' => $item['verb']]);
 696                 return GRAVITY_UNKNOWN;   // Should not happen
 697         }
 698
 699         public static function insert($item, $notify = false, $dontcache = false)
 700         {
 701                 $orig_item = $item;
 702
 703                 $priority = PRIORITY_HIGH;
 704
 705                 // If it is a posting where users should get notifications, then define it as wall posting
 706                 if ($notify) {
 707                         $item['wall'] = 1;
 708                         $item['origin'] = 1;
 709                         $item['network'] = Protocol::DFRN;
 710                         $item['protocol'] = Conversation::PARCEL_DIRECT;
 711                         $item['direction'] = Conversation::PUSH;
 712
 713                         if (in_array($notify, PRIORITIES)) {
 714                                 $priority = $notify;
 715                         }
 716                 } else {
 717                         $item['network'] = trim(($item['network'] ?? '') ?: Protocol::PHANTOM);
 718                 }
 719
 720                 $uid = intval($item['uid']);
 721
 722                 $item['guid'] = self::guid($item, $notify);
 723                 $item['uri'] = substr(trim($item['uri'] ?? '') ?: self::newURI($item['uid'], $item['guid']), 0, 255);
 724
 725                 // Store URI data
 726                 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
 727
 728                 // Backward compatibility: parent-uri used to be the direct parent uri.
 729                 // If it is provided without a thr-parent, it probably is the old behavior.
 730                 $item['thr-parent'] = trim($item['thr-parent'] ?? $item['parent-uri'] ?? $item['uri']);
 731                 $item['parent-uri'] = $item['thr-parent'];
 732
 733                 $item['thr-parent-id'] = $item['parent-uri-id'] = ItemURI::getIdByURI($item['thr-parent']);
 734
 735                 // Store conversation data
 736                 $item = Conversation::insert($item);
 737
 738                 /*
 739                  * Do we already have this item?
 740                  * We have to check several networks since Friendica posts could be repeated
 741                  * via OStatus (maybe Diasporsa as well)
 742                  */
 743                 $duplicate = self::getDuplicateID($item);
 744                 if ($duplicate) {
 745                         return $duplicate;
 746                 }
 747
 748                 // Additional duplicate checks
 749                 /// @todo Check why the first duplication check returns the item number and the second a 0
 750                 if (self::isDuplicate($item)) {
 751                         return 0;
 752                 }
 753
 754                 if (!isset($item['post-type'])) {
 755                         $item['post-type'] = empty($item['title']) ? self::PT_NOTE : self::PT_ARTICLE;
 756                 }
 757
 758                 $item['wall']          = intval($item['wall'] ?? 0);
 759                 $item['extid']         = trim($item['extid'] ?? '');
 760                 $item['author-name']   = trim($item['author-name'] ?? '');
 761                 $item['author-link']   = trim($item['author-link'] ?? '');
 762                 $item['author-avatar'] = trim($item['author-avatar'] ?? '');
 763                 $item['owner-name']    = trim($item['owner-name'] ?? '');
 764                 $item['owner-link']    = trim($item['owner-link'] ?? '');
 765                 $item['owner-avatar']  = trim($item['owner-avatar'] ?? '');
 766                 $item['received']      = (isset($item['received'])  ? DateTimeFormat::utc($item['received'])  : DateTimeFormat::utcNow());
 767                 $item['created']       = (isset($item['created'])   ? DateTimeFormat::utc($item['created'])   : $item['received']);
 768                 $item['edited']        = (isset($item['edited'])    ? DateTimeFormat::utc($item['edited'])    : $item['created']);
 769                 $item['changed']       = (isset($item['changed'])   ? DateTimeFormat::utc($item['changed'])   : $item['created']);
 770                 $item['commented']     = (isset($item['commented']) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 771                 $item['title']         = substr(trim($item['title'] ?? ''), 0, 255);
 772                 $item['location']      = trim($item['location'] ?? '');
 773                 $item['coord']         = trim($item['coord'] ?? '');
 774                 $item['visible']       = (isset($item['visible']) ? intval($item['visible']) : 1);
 775                 $item['deleted']       = 0;
 776                 $item['verb']          = trim($item['verb'] ?? '');
 777                 $item['object-type']   = trim($item['object-type'] ?? '');
 778                 $item['object']        = trim($item['object'] ?? '');
 779                 $item['target-type']   = trim($item['target-type'] ?? '');
 780                 $item['target']        = trim($item['target'] ?? '');
 781                 $item['plink']         = substr(trim($item['plink'] ?? ''), 0, 255);
 782                 $item['allow_cid']     = trim($item['allow_cid'] ?? '');
 783                 $item['allow_gid']     = trim($item['allow_gid'] ?? '');
 784                 $item['deny_cid']      = trim($item['deny_cid'] ?? '');
 785                 $item['deny_gid']      = trim($item['deny_gid'] ?? '');
 786                 $item['private']       = intval($item['private'] ?? self::PUBLIC);
 787                 $item['body']          = trim($item['body'] ?? '');
 788                 $item['raw-body']      = trim($item['raw-body'] ?? $item['body']);
 789                 $item['app']           = trim($item['app'] ?? '');
 790                 $item['origin']        = intval($item['origin'] ?? 0);
 791                 $item['postopts']      = trim($item['postopts'] ?? '');
 792                 $item['resource-id']   = trim($item['resource-id'] ?? '');
 793                 $item['event-id']      = intval($item['event-id'] ?? 0);
 794                 $item['inform']        = trim($item['inform'] ?? '');
 795                 $item['file']          = trim($item['file'] ?? '');
 796
 797                 // Items cannot be stored before they happen ...
 798                 if ($item['created'] > DateTimeFormat::utcNow()) {
 799                         $item['created'] = DateTimeFormat::utcNow();
 800                 }
 801
 802                 // We haven't invented time travel by now.
 803                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 804                         $item['edited'] = DateTimeFormat::utcNow();
 805                 }
 806
 807                 $item['plink'] = ($item['plink'] ?? '') ?: DI::baseUrl() . '/display/' . urlencode($item['guid']);
 808
 809                 $item['gravity'] = self::getGravity($item);
 810
 811                 $item['language'] = self::getLanguage($item);
 812
 813                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 814                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 815                 $item['author-id'] = ($item['author-id'] ?? 0) ?: Contact::getIdForURL($item['author-link'], 0, null, $default);
 816
 817                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 818                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 819                 $item['owner-id'] = ($item['owner-id'] ?? 0) ?: Contact::getIdForURL($item['owner-link'], 0, null, $default);
 820
 821                 $actor = ($item['gravity'] == GRAVITY_PARENT) ? $item['owner-id'] : $item['author-id'];
 822                 if (!$item['origin'] && ($item['uid'] != 0) && Contact::isSharing($actor, $item['uid'])) {
 823                         $item['post-reason'] = self::PR_FOLLOWER;
 824                 }
 825
 826                 // Ensure that there is an avatar cache
 827                 Contact::checkAvatarCache($item['author-id']);
 828                 Contact::checkAvatarCache($item['owner-id']);
 829
 830                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 831                 $item["contact-id"] = self::contactId($item);
 832
 833                 if (!empty($item['direction']) && in_array($item['direction'], [Conversation::PUSH, Conversation::RELAY]) &&
 834                         self::isTooOld($item)) {
 835                         Logger::info('Item is too old', ['item' => $item]);
 836                         return 0;
 837                 }
 838
 839                 if (!self::isValid($item)) {
 840                         return 0;
 841                 }
 842
 843                 if ($item['gravity'] !== GRAVITY_PARENT) {
 844                         $toplevel_parent = self::getTopLevelParent($item);
 845                         if (empty($toplevel_parent)) {
 846                                 return 0;
 847                         }
 848
 849                         // If the thread originated from this node, we check the permission against the thread starter
 850                         $condition = ['uri-id' => $toplevel_parent['uri-id'], 'wall' => true];
 851                         $localTopLevelParent = Post::selectFirst(['uid'], $condition);
 852                         if (!empty($localTopLevelParent['uid']) && !self::isAllowedByUser($item, $localTopLevelParent['uid'])) {
 853                                 return 0;
 854                         }
 855
 856                         $parent_id             = $toplevel_parent['id'];
 857                         $item['parent-uri']    = $toplevel_parent['uri'];
 858                         $item['parent-uri-id'] = $toplevel_parent['uri-id'];
 859                         $item['deleted']       = $toplevel_parent['deleted'];
 860                         $item['allow_cid']     = $toplevel_parent['allow_cid'];
 861                         $item['allow_gid']     = $toplevel_parent['allow_gid'];
 862                         $item['deny_cid']      = $toplevel_parent['deny_cid'];
 863                         $item['deny_gid']      = $toplevel_parent['deny_gid'];
 864                         $parent_origin         = $toplevel_parent['origin'];
 865
 866                         // Don't federate received participation messages
 867                         if ($item['verb'] != Activity::FOLLOW) {
 868                                 $item['wall'] = $toplevel_parent['wall'];
 869                         } else {
 870                                 $item['wall'] = false;
 871                                 // Participations are technical messages, so they are set to "seen" automatically
 872                                 $item['unseen'] = false;
 873                         }
 874
 875                         /*
 876                          * If the parent is private, force privacy for the entire conversation
 877                          * This differs from the above settings as it subtly allows comments from
 878                          * email correspondents to be private even if the overall thread is not.
 879                          */
 880                         if ($toplevel_parent['private']) {
 881                                 $item['private'] = $toplevel_parent['private'];
 882                         }
 883
 884                         /*
 885                          * Edge case. We host a public forum that was originally posted to privately.
 886                          * The original author commented, but as this is a comment, the permissions
 887                          * weren't fixed up so it will still show the comment as private unless we fix it here.
 888                          */
 889                         if ((intval($toplevel_parent['forum_mode']) == 1) && ($toplevel_parent['private'] != self::PUBLIC)) {
 890                                 $item['private'] = self::PUBLIC;
 891                         }
 892
 893                         // If its a post that originated here then tag the thread as "mention"
 894                         if ($item['origin'] && $item['uid']) {
 895                                 DBA::update('post-thread-user', ['mention' => true], ['uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 896                                 Logger::info('tagged thread as mention', ['parent' => $parent_id, 'parent-uri-id' => $item['parent-uri-id'], 'uid' => $item['uid']]);
 897                         }
 898
 899                         // Update the contact relations
 900                         Contact\Relation::store($toplevel_parent['author-id'], $item['author-id'], $item['created']);
 901                 } else {
 902                         $parent_id = 0;
 903                         $parent_origin = $item['origin'];
 904                 }
 905
 906                 $item['parent-uri-id'] = ItemURI::getIdByURI($item['parent-uri']);
 907                 $item['thr-parent-id'] = ItemURI::getIdByURI($item['thr-parent']);
 908
 909                 // Is this item available in the global items (with uid=0)?
 910                 if ($item["uid"] == 0) {
 911                         $item["global"] = true;
 912
 913                         // Set the global flag on all items if this was a global item entry
 914                         Post::update(['global' => true], ['uri-id' => $item['uri-id']]);
 915                 } else {
 916                         $item['global'] = Post::exists(['uid' => 0, 'uri-id' => $item['uri-id']]);
 917                 }
 918
 919                 // ACL settings
 920                 if (!empty($item["allow_cid"] . $item["allow_gid"] . $item["deny_cid"] . $item["deny_gid"])) {
 921                         $item["private"] = self::PRIVATE;
 922                 }
 923
 924                 if ($notify) {
 925                         $item['edit'] = false;
 926                         $item['parent'] = $parent_id;
 927                         Hook::callAll('post_local', $item);
 928                 } else {
 929                         Hook::callAll('post_remote', $item);
 930                 }
 931
 932                 if (!empty($item['cancel'])) {
 933                         Logger::log('post cancelled by addon.');
 934                         return 0;
 935                 }
 936
 937                 if (empty($item['vid']) && !empty($item['verb'])) {
 938                         $item['vid'] = Verb::getID($item['verb']);
 939                 }
 940
 941                 // Creates or assigns the permission set
 942                 $item['psid'] = PermissionSet::getIdFromACL(
 943                         $item['uid'],
 944                         $item['allow_cid'],
 945                         $item['allow_gid'],
 946                         $item['deny_cid'],
 947                         $item['deny_gid']
 948                 );
 949
 950                 if (!empty($item['extid'])) {
 951                         $item['external-id'] = ItemURI::getIdByURI($item['extid']);
 952                 }
 953
 954                 if ($item['verb'] == Activity::ANNOUNCE) {
 955                         self::setOwnerforResharedItem($item);
 956                 }
 957
 958                 // Remove all media attachments from the body and store them in the post-media table
 959                 $item['raw-body'] = Post\Media::insertFromBody($item['uri-id'], $item['raw-body']);
 960                 $item['raw-body'] = self::setHashtags($item['raw-body']);
 961
 962                 // Check for hashtags in the body and repair or add hashtag links
 963                 $item['body'] = self::setHashtags($item['body']);
 964
 965                 // Fill the cache field
 966                 self::putInCache($item);
 967
 968                 if (stristr($item['verb'], Activity::POKE)) {
 969                         $notify_type = Delivery::POKE;
 970                 } else {
 971                         $notify_type = Delivery::POST;
 972                 }
 973
 974                 // Filling item related side tables
 975                 if (!empty($item['attach'])) {
 976                         Post\Media::insertFromAttachment($item['uri-id'], $item['attach']);
 977                 }
 978
 979                 if (empty($item['event-id'])) {
 980                         unset($item['event-id']);
 981                 }
 982
 983                 if (empty($item['causer-id'])) {
 984                         unset($item['causer-id']);
 985                 }
 986
 987                 Post::insert($item['uri-id'], $item);
 988
 989                 if ($item['gravity'] == GRAVITY_PARENT) {
 990                         Post\Thread::insert($item['uri-id'], $item);
 991                 }
 992
 993                 if (!in_array($item['verb'], self::ACTIVITIES)) {
 994                         Post\Content::insert($item['uri-id'], $item);
 995                 }
 996
 997                 // Diaspora signature
 998                 if (!empty($item['diaspora_signed_text'])) {
 999                         DBA::replace('diaspora-interaction', ['uri-id' => $item['uri-id'], 'interaction' => $item['diaspora_signed_text']]);
1000                 }
1001
1002                 // Attached file links
1003                 if (!empty($item['file'])) {
1004                         Post\Category::storeTextByURIId($item['uri-id'], $item['uid'], $item['file']);
1005                 }
1006
1007                 // Delivery relevant data
1008                 $delivery_data = Post\DeliveryData::extractFields($item);
1009
1010                 if (!empty($item['origin']) || !empty($item['wall']) || !empty($delivery_data['postopts']) || !empty($delivery_data['inform'])) {
1011                         Post\DeliveryData::insert($item['uri-id'], $delivery_data);
1012                 }
1013
1014                 // Store tags from the body if this hadn't been handled previously in the protocol classes
1015                 if (!Tag::existsForPost($item['uri-id'])) {
1016                         Tag::storeFromBody($item['uri-id'], $item['body']);
1017                 }
1018
1019                 $condition = ['uri-id' => $item['uri-id'], 'uid' => $item['uid']];
1020                 if (Post::exists($condition)) {
1021                         Logger::notice('Item is already inserted - aborting', $condition);
1022                         return 0;
1023                 }
1024
1025                 $post_user_id = Post\User::insert($item['uri-id'], $item['uid'], $item);
1026                 if (!$post_user_id) {
1027                         Logger::notice('Post-User is already inserted - aborting', ['uid' => $item['uid'], 'uri-id' => $item['uri-id']]);
1028                         return 0;
1029                 }
1030
1031                 if ($item['gravity'] == GRAVITY_PARENT) {
1032                         $item['post-user-id'] = $post_user_id;
1033                         Post\ThreadUser::insert($item['uri-id'], $item['uid'], $item);
1034                 }
1035
1036                 Logger::notice('created item', ['post-id' => $post_user_id, 'uid' => $item['uid'], 'network' => $item['network'], 'uri-id' => $item['uri-id'], 'guid' => $item['guid']]);
1037
1038                 $posted_item = Post::selectFirst(self::ITEM_FIELDLIST, ['post-user-id' => $post_user_id]);
1039                 if (!DBA::isResult($posted_item)) {
1040                         // On failure store the data into a spool file so that the "SpoolPost" worker can try again later.
1041                         Logger::warning('Could not store item. it will be spooled', ['id' => $post_user_id]);
1042                         self::spool($orig_item);
1043                         return 0;
1044                 }
1045
1046                 // update the commented timestamp on the parent
1047                 if (DI::config()->get('system', 'like_no_comment')) {
1048                         // Update when it is a comment
1049                         $update_commented = in_array($posted_item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]);
1050                 } else {
1051                         // Update when it isn't a follow or tag verb
1052                         $update_commented = !in_array($posted_item['verb'], [Activity::FOLLOW, Activity::TAG]);
1053                 }
1054
1055                 if ($update_commented) {
1056                         $fields = ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()];
1057                 } else {
1058                         $fields = ['changed' => DateTimeFormat::utcNow()];
1059                 }
1060
1061                 Post::update($fields, ['uri-id' => $posted_item['parent-uri-id'], 'uid' => $posted_item['uid']]);
1062
1063                 // In that function we check if this is a forum post. Additionally we delete the item under certain circumstances
1064                 if (self::tagDeliver($posted_item['uid'], $post_user_id)) {
1065                         // Get the user information for the logging
1066                         $user = User::getById($uid);
1067
1068                         Logger::notice('Item had been deleted', ['id' => $post_user_id, 'user' => $uid, 'account-type' => $user['account-type']]);
1069                         return 0;
1070                 }
1071
1072                 if (!$dontcache) {
1073                         if ($notify) {
1074                                 Hook::callAll('post_local_end', $posted_item);
1075                         } else {
1076                                 Hook::callAll('post_remote_end', $posted_item);
1077                         }
1078                 }
1079
1080                 if ($posted_item['gravity'] === GRAVITY_PARENT) {
1081                         self::addShadow($post_user_id);
1082                 } else {
1083                         self::addShadowPost($post_user_id);
1084                 }
1085
1086                 self::updateContact($posted_item);
1087
1088                 Post\UserNotification::setNotification($posted_item['uri-id'], $posted_item['uid']);
1089
1090                 check_user_notification($posted_item['uri-id'], $posted_item['uid']);
1091
1092                 // Distribute items to users who subscribed to their tags
1093                 self::distributeByTags($posted_item);
1094
1095                 // Automatically reshare the item if the "remote_self" option is selected
1096                 self::autoReshare($posted_item);
1097
1098                 $transmit = $notify || ($posted_item['visible'] && ($parent_origin || $posted_item['origin']));
1099
1100                 if ($transmit) {
1101                         // Don't relay participation messages
1102                         if (($posted_item['verb'] == Activity::FOLLOW) &&
1103                                 (!$posted_item['origin'] || ($posted_item['author-id'] != Contact::getPublicIdByUserId($uid)))) {
1104                                 Logger::info('Participation messages will not be relayed', ['item' => $posted_item['id'], 'uri' => $posted_item['uri'], 'verb' => $posted_item['verb']]);
1105                                 $transmit = false;
1106                         }
1107                 }
1108
1109                 if ($transmit) {
1110                         Worker::add(['priority' => $priority, 'dont_fork' => true], 'Notifier', $notify_type, (int)$posted_item['uri-id'], (int)$posted_item['uid']);
1111                 }
1112
1113                 return $post_user_id;
1114         }
1115
1116         /**
1117          * Change the owner of a parent item if it had been shared by a forum
1118          *
1119          * (public) forum posts in the new format consist of the regular post by the author
1120          * followed by an announce message sent from the forum account.
1121          * Changing the owner helps in grouping forum posts.
1122          *
1123          * @param array $item
1124          * @return void
1125          */
1126         private static function setOwnerforResharedItem(array $item)
1127         {
1128                 $parent = Post::selectFirst(['id', 'causer-id', 'owner-id', 'author-id', 'author-link', 'origin', 'post-reason'],
1129                         ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1130                 if (!DBA::isResult($parent)) {
1131                         Logger::error('Parent not found', ['uri-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1132                         return;
1133                 }
1134
1135                 $author = Contact::selectFirst(['url', 'contact-type', 'network'], ['id' => $item['author-id']]);
1136                 if (!DBA::isResult($author)) {
1137                         Logger::error('Author not found', ['id' => $item['author-id']]);
1138                         return;
1139                 }
1140
1141                 $cid = Contact::getIdForURL($author['url'], $item['uid']);
1142                 if (empty($cid) || !Contact::isSharing($cid, $item['uid'])) {
1143                         Logger::info('The resharer is not a following contact: quit', ['resharer' => $author['url'], 'uid' => $item['uid'], 'cid' => $cid]);
1144                         return;
1145                 }
1146
1147                 if ($author['contact-type'] != Contact::TYPE_COMMUNITY) {
1148                         if ($parent['post-reason'] == self::PR_ANNOUNCEMENT) {
1149                                 Logger::info('The parent is already marked as announced: quit', ['causer' => $parent['causer-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1150                                 return;
1151                         }
1152
1153                         if (Contact::isSharing($parent['owner-id'], $item['uid'])) {
1154                                 Logger::info('The resharer is no forum: quit', ['resharer' => $item['author-id'], 'owner' => $parent['owner-id'], 'author' => $parent['author-id'], 'uid' => $item['uid']]);
1155                                 return;
1156                         }
1157                         self::update(['post-reason' => self::PR_ANNOUNCEMENT, 'causer-id' => $item['author-id']], ['id' => $parent['id']]);
1158                         Logger::info('Set announcement post-reason', ['uri-id' => $item['uri-id'], 'thr-parent-id' => $item['thr-parent-id'], 'uid' => $item['uid']]);
1159                         return;
1160                 }
1161
1162                 self::update(['owner-id' => $item['author-id'], 'contact-id' => $cid], ['id' => $parent['id']]);
1163                 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]);
1164         }
1165
1166         /**
1167          * Distribute the given item to users who subscribed to their tags
1168          *
1169          * @param array $item     Processed item
1170          */
1171         private static function distributeByTags(array $item)
1172         {
1173                 if (($item['uid'] != 0) || ($item['gravity'] != GRAVITY_PARENT) || !in_array($item['network'], Protocol::FEDERATED)) {
1174                         return;
1175                 }
1176
1177                 $uids = Tag::getUIDListByURIId($item['uri-id']);
1178                 foreach ($uids as $uid) {
1179                         if (Contact::isSharing($item['author-id'], $uid)) {
1180                                 $fields = [];
1181                         } else {
1182                                 $fields = ['post-reason' => self::PR_TAG];
1183                         }
1184
1185                         $stored = self::storeForUserByUriId($item['uri-id'], $uid, $fields);
1186                         Logger::info('Stored item for users', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'fields' => $fields, 'stored' => $stored]);
1187                 }
1188         }
1189
1190         /**
1191          * Distributes public items to the receivers
1192          *
1193          * @param integer $itemid      Item ID that should be added
1194          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
1195          * @throws \Exception
1196          */
1197         public static function distribute($itemid, $signed_text = '')
1198         {
1199                 $condition = ["`id` IN (SELECT `parent` FROM `post-user-view` WHERE `id` = ?)", $itemid];
1200                 $parent = Post::selectFirst(['owner-id'], $condition);
1201                 if (!DBA::isResult($parent)) {
1202                         Logger::warning('Item not found', ['condition' => $condition]);
1203                         return;
1204                 }
1205
1206                 // Only distribute public items from native networks
1207                 $condition = ['id' => $itemid, 'uid' => 0,
1208                         'network' => array_merge(Protocol::FEDERATED ,['']),
1209                         'visible' => true, 'deleted' => false, 'private' => [self::PUBLIC, self::UNLISTED]];
1210                 $item = Post::selectFirst(self::ITEM_FIELDLIST, $condition);
1211                 if (!DBA::isResult($item)) {
1212                         Logger::warning('Item not found', ['condition' => $condition]);
1213                         return;
1214                 }
1215
1216                 $origin = $item['origin'];
1217
1218                 $users = [];
1219
1220                 /// @todo add a field "pcid" in the contact table that referrs to the public contact id.
1221                 $owner = DBA::selectFirst('contact', ['url', 'nurl', 'alias'], ['id' => $parent['owner-id']]);
1222                 if (!DBA::isResult($owner)) {
1223                         return;
1224                 }
1225
1226                 $condition = ['nurl' => $owner['nurl'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1227                 $contacts = DBA::select('contact', ['uid'], $condition);
1228                 while ($contact = DBA::fetch($contacts)) {
1229                         if ($contact['uid'] == 0) {
1230                                 continue;
1231                         }
1232
1233                         $users[$contact['uid']] = $contact['uid'];
1234                 }
1235                 DBA::close($contacts);
1236
1237                 $condition = ['alias' => $owner['url'], 'rel' => [Contact::SHARING, Contact::FRIEND]];
1238                 $contacts = DBA::select('contact', ['uid'], $condition);
1239                 while ($contact = DBA::fetch($contacts)) {
1240                         if ($contact['uid'] == 0) {
1241                                 continue;
1242                         }
1243
1244                         $users[$contact['uid']] = $contact['uid'];
1245                 }
1246                 DBA::close($contacts);
1247
1248                 if (!empty($owner['alias'])) {
1249                         $condition = ['nurl' => Strings::normaliseLink($owner['alias']), 'rel' => [Contact::SHARING, Contact::FRIEND]];
1250                         $contacts = DBA::select('contact', ['uid'], $condition);
1251                         while ($contact = DBA::fetch($contacts)) {
1252                                 if ($contact['uid'] == 0) {
1253                                         continue;
1254                                 }
1255
1256                                 $users[$contact['uid']] = $contact['uid'];
1257                         }
1258                         DBA::close($contacts);
1259                 }
1260
1261                 $origin_uid = 0;
1262
1263                 if ($item['uri-id'] != $item['parent-uri-id']) {
1264                         $parents = Post::select(['uid', 'origin'], ["`uri-id` = ? AND `uid` != 0", $item['parent-uri-id']]);
1265                         while ($parent = Post::fetch($parents)) {
1266                                 $users[$parent['uid']] = $parent['uid'];
1267                                 if ($parent['origin'] && !$origin) {
1268                                         $origin_uid = $parent['uid'];
1269                                 }
1270                         }
1271                         DBA::close($parents);
1272                 }
1273
1274                 foreach ($users as $uid) {
1275                         if ($origin_uid == $uid) {
1276                                 $item['diaspora_signed_text'] = $signed_text;
1277                         }
1278                         self::storeForUser($item, $uid);
1279                 }
1280         }
1281
1282         /**
1283          * Store a public item defined by their URI-ID for the given users
1284          *
1285          * @param integer $uri_id URI-ID of the given item
1286          * @param integer $uid    The user that will receive the item entry
1287          * @param array   $fields Additional fields to be stored
1288          * @return integer stored item id
1289          */
1290         public static function storeForUserByUriId(int $uri_id, int $uid, array $fields = [])
1291         {
1292                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['uri-id' => $uri_id, 'uid' => 0]);
1293                 if (!DBA::isResult($item)) {
1294                         return 0;
1295                 }
1296
1297                 if (($item['private'] == self::PRIVATE) || !in_array($item['network'], Protocol::FEDERATED)) {
1298                         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']]);
1299                         return 0;
1300                 }
1301
1302                 $item['post-reason'] = self::PR_STORED;
1303
1304                 $item = array_merge($item, $fields);
1305
1306                 $stored = self::storeForUser($item, $uid);
1307                 Logger::info('Public item stored for user', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'stored' => $stored]);
1308                 return $stored;
1309         }
1310
1311         /**
1312          * Store a public item array for the given users
1313          *
1314          * @param array   $item   The item entry that will be stored
1315          * @param integer $uid    The user that will receive the item entry
1316          * @return integer stored item id
1317          * @throws \Exception
1318          */
1319         private static function storeForUser(array $item, int $uid)
1320         {
1321                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => $uid])) {
1322                         Logger::info('Item already exists', ['uri-id' => $item['uri-id'], 'uid' => $uid]);
1323                         return 0;
1324                 }
1325
1326                 unset($item['id']);
1327                 unset($item['parent']);
1328                 unset($item['mention']);
1329                 unset($item['starred']);
1330                 unset($item['unseen']);
1331                 unset($item['psid']);
1332
1333                 $item['uid'] = $uid;
1334                 $item['origin'] = 0;
1335                 $item['wall'] = 0;
1336
1337                 if ($item['gravity'] == GRAVITY_PARENT) {
1338                         $contact = Contact::getByURLForUser($item['owner-link'], $uid, false, ['id']);
1339                 } else {
1340                         $contact = Contact::getByURLForUser($item['author-link'], $uid, false, ['id']);
1341                 }
1342
1343                 if (!empty($contact['id'])) {
1344                         $item['contact-id'] = $contact['id'];
1345                 } else {
1346                         // Shouldn't happen at all
1347                         Logger::warning('contact-id could not be fetched', ['uid' => $uid, 'item' => $item]);
1348                         $self = DBA::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
1349                         if (!DBA::isResult($self)) {
1350                                 // Shouldn't happen even less
1351                                 Logger::warning('self contact could not be fetched', ['uid' => $uid, 'item' => $item]);
1352                                 return 0;
1353                         }
1354                         $item['contact-id'] = $self['id'];
1355                 }
1356
1357                 /// @todo Handling of "event-id"
1358
1359                 $notify = false;
1360                 if ($item['gravity'] == GRAVITY_PARENT) {
1361                         $contact = DBA::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1362                         if (DBA::isResult($contact)) {
1363                                 $notify = self::isRemoteSelf($contact, $item);
1364                         }
1365                 }
1366
1367                 $distributed = self::insert($item, $notify, true);
1368
1369                 if (!$distributed) {
1370                         Logger::info("Distributed public item wasn't stored", ['uri-id' => $item['uri-id'], 'user' => $uid]);
1371                 } else {
1372                         Logger::info('Distributed public item was stored', ['uri-id' => $item['uri-id'], 'user' => $uid, 'stored' => $distributed]);
1373                 }
1374                 return $distributed;
1375         }
1376
1377         /**
1378          * Add a shadow entry for a given item id that is a thread starter
1379          *
1380          * We store every public item entry additionally with the user id "0".
1381          * This is used for the community page and for the search.
1382          * It is planned that in the future we will store public item entries only once.
1383          *
1384          * @param integer $itemid Item ID that should be added
1385          * @throws \Exception
1386          */
1387         private static function addShadow($itemid)
1388         {
1389                 $fields = ['uid', 'private', 'visible', 'deleted', 'network', 'uri-id'];
1390                 $condition = ['id' => $itemid, 'gravity' => GRAVITY_PARENT];
1391                 $item = Post::selectFirst($fields, $condition);
1392
1393                 if (!DBA::isResult($item)) {
1394                         return;
1395                 }
1396
1397                 // is it already a copy?
1398                 if (($itemid == 0) || ($item['uid'] == 0)) {
1399                         return;
1400                 }
1401
1402                 // Is it a visible public post?
1403                 if (!$item["visible"] || $item["deleted"]  || ($item["private"] == self::PRIVATE)) {
1404                         return;
1405                 }
1406
1407                 // is it an entry from a connector? Only add an entry for natively connected networks
1408                 if (!in_array($item["network"], array_merge(Protocol::FEDERATED ,['']))) {
1409                         return;
1410                 }
1411
1412                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1413                         return;
1414                 }
1415
1416                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1417
1418                 if (DBA::isResult($item)) {
1419                         // Preparing public shadow (removing user specific data)
1420                         $item['uid'] = 0;
1421                         unset($item['id']);
1422                         unset($item['parent']);
1423                         unset($item['wall']);
1424                         unset($item['mention']);
1425                         unset($item['origin']);
1426                         unset($item['starred']);
1427                         unset($item['postopts']);
1428                         unset($item['inform']);
1429                         unset($item['post-reason']);
1430                         if ($item['uri-id'] == $item['parent-uri-id']) {
1431                                 $item['contact-id'] = $item['owner-id'];
1432                         } else {
1433                                 $item['contact-id'] = $item['author-id'];
1434                         }
1435
1436                         $public_shadow = self::insert($item, false, true);
1437
1438                         Logger::info('Stored public shadow', ['thread' => $itemid, 'id' => $public_shadow]);
1439                 }
1440         }
1441
1442         /**
1443          * Add a shadow entry for a given item id that is a comment
1444          *
1445          * This function does the same like the function above - but for comments
1446          *
1447          * @param integer $itemid Item ID that should be added
1448          * @throws \Exception
1449          */
1450         private static function addShadowPost($itemid)
1451         {
1452                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $itemid]);
1453                 if (!DBA::isResult($item)) {
1454                         return;
1455                 }
1456
1457                 // Is it a toplevel post?
1458                 if ($item['gravity'] == GRAVITY_PARENT) {
1459                         self::addShadow($itemid);
1460                         return;
1461                 }
1462
1463                 // Is this a shadow entry?
1464                 if ($item['uid'] == 0) {
1465                         return;
1466                 }
1467
1468                 // Is there a shadow parent?
1469                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => 0])) {
1470                         return;
1471                 }
1472
1473                 // Is there already a shadow entry?
1474                 if (Post::exists(['uri-id' => $item['uri-id'], 'uid' => 0])) {
1475                         return;
1476                 }
1477
1478                 // Save "origin" and "parent" state
1479                 $origin = $item['origin'];
1480                 $parent = $item['parent'];
1481
1482                 // Preparing public shadow (removing user specific data)
1483                 $item['uid'] = 0;
1484                 unset($item['id']);
1485                 unset($item['parent']);
1486                 unset($item['wall']);
1487                 unset($item['mention']);
1488                 unset($item['origin']);
1489                 unset($item['starred']);
1490                 unset($item['postopts']);
1491                 unset($item['inform']);
1492                 unset($item['post-reason']);
1493                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1494
1495                 $public_shadow = self::insert($item, false, true);
1496
1497                 Logger::info('Stored public shadow', ['uri-id' => $item['uri-id'], 'id' => $public_shadow]);
1498
1499                 // If this was a comment to a Diaspora post we don't get our comment back.
1500                 // This means that we have to distribute the comment by ourselves.
1501                 if ($origin && Post::exists(['id' => $parent, 'network' => Protocol::DIASPORA])) {
1502                         self::distribute($public_shadow);
1503                 }
1504         }
1505
1506         /**
1507          * Adds a language specification in a "language" element of given $arr.
1508          * Expects "body" element to exist in $arr.
1509          *
1510          * @param array $item
1511          * @return string detected language
1512          * @throws \Text_LanguageDetect_Exception
1513          */
1514         private static function getLanguage(array $item)
1515         {
1516                 if (!empty($item['language'])) {
1517                         return $item['language'];
1518                 }
1519
1520                 if (!in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT]) || empty($item['body'])) {
1521                         return '';
1522                 }
1523
1524                 // Convert attachments to links
1525                 $naked_body = BBCode::removeAttachment($item['body']);
1526                 if (empty($naked_body)) {
1527                         return '';
1528                 }
1529
1530                 // Remove links and pictures
1531                 $naked_body = BBCode::removeLinks($naked_body);
1532
1533                 // Convert the title and the body to plain text
1534                 $naked_body = trim($item['title'] . "\n" . BBCode::toPlaintext($naked_body));
1535
1536                 // Remove possibly remaining links
1537                 $naked_body = preg_replace(Strings::autoLinkRegEx(), '', $naked_body);
1538
1539                 if (empty($naked_body)) {
1540                         return '';
1541                 }
1542
1543                 $ld = new Language(DI::l10n()->getAvailableLanguages());
1544                 $languages = $ld->detect($naked_body)->limit(0, 3)->close();
1545                 if (is_array($languages)) {
1546                         return json_encode($languages);
1547                 }
1548
1549                 return '';
1550         }
1551
1552         public static function getLanguageMessage(array $item)
1553         {
1554                 $iso639 = new \Matriphe\ISO639\ISO639;
1555
1556                 $used_languages = '';
1557                 foreach (json_decode($item['language'], true) as $language => $reliability) {
1558                         $used_languages .= $iso639->languageByCode1($language) . ' (' . $language . "): " . number_format($reliability, 5) . '\n';
1559                 }
1560                 $used_languages = DI::l10n()->t('Detected languages in this post:\n%s', $used_languages);
1561                 return $used_languages;
1562         }
1563
1564         /**
1565          * Creates an unique guid out of a given uri
1566          *
1567          * @param string $uri uri of an item entry
1568          * @param string $host hostname for the GUID prefix
1569          * @return string unique guid
1570          */
1571         public static function guidFromUri($uri, $host)
1572         {
1573                 // Our regular guid routine is using this kind of prefix as well
1574                 // We have to avoid that different routines could accidentally create the same value
1575                 $parsed = parse_url($uri);
1576
1577                 // We use a hash of the hostname as prefix for the guid
1578                 $guid_prefix = hash("crc32", $host);
1579
1580                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1581                 unset($parsed["scheme"]);
1582
1583                 // Glue it together to be able to make a hash from it
1584                 $host_id = implode("/", $parsed);
1585
1586                 // We could use any hash algorithm since it isn't a security issue
1587                 $host_hash = hash("ripemd128", $host_id);
1588
1589                 return $guid_prefix.$host_hash;
1590         }
1591
1592         /**
1593          * generate an unique URI
1594          *
1595          * @param integer $uid  User id
1596          * @param string  $guid An existing GUID (Otherwise it will be generated)
1597          *
1598          * @return string
1599          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1600          */
1601         public static function newURI($uid, $guid = "")
1602         {
1603                 if ($guid == "") {
1604                         $guid = System::createUUID();
1605                 }
1606
1607                 return DI::baseUrl()->get() . '/objects/' . $guid;
1608         }
1609
1610         /**
1611          * Set "success_update" and "last-item" to the date of the last time we heard from this contact
1612          *
1613          * This can be used to filter for inactive contacts.
1614          * Only do this for public postings to avoid privacy problems, since poco data is public.
1615          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1616          *
1617          * @param array $arr Contains the just posted item record
1618          * @throws \Exception
1619          */
1620         private static function updateContact($arr)
1621         {
1622                 // Unarchive the author
1623                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1624                 if (DBA::isResult($contact)) {
1625                         Contact::unmarkForArchival($contact);
1626                 }
1627
1628                 // Unarchive the contact if it's not our own contact
1629                 $contact = DBA::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1630                 if (DBA::isResult($contact)) {
1631                         Contact::unmarkForArchival($contact);
1632                 }
1633
1634                 /// @todo On private posts we could obfuscate the date
1635                 $update = ($arr['private'] != self::PRIVATE) || in_array($arr['network'], Protocol::FEDERATED);
1636
1637                 // Is it a forum? Then we don't care about the rules from above
1638                 if (!$update && in_array($arr["network"], [Protocol::ACTIVITYPUB, Protocol::DFRN]) && ($arr["parent-uri-id"] === $arr["uri-id"])) {
1639                         if (DBA::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1640                                 $update = true;
1641                         }
1642                 }
1643
1644                 if ($update) {
1645                         // The "self" contact id is used (for example in the connectors) when the contact is unknown
1646                         // So we have to ensure to only update the last item when it had been our own post,
1647                         // or it had been done by a "regular" contact.
1648                         if (!empty($arr['wall'])) {
1649                                 $condition = ['id' => $arr['contact-id']];
1650                         } else {
1651                                 $condition = ['id' => $arr['contact-id'], 'self' => false];
1652                         }
1653                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']], $condition);
1654                 }
1655                 // Now do the same for the system wide contacts with uid=0
1656                 if ($arr['private'] != self::PRIVATE) {
1657                         DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1658                                 ['id' => $arr['owner-id']]);
1659
1660                         if ($arr['owner-id'] != $arr['author-id']) {
1661                                 DBA::update('contact', ['failed' => false, 'success_update' => $arr['received'], 'last-item' => $arr['received']],
1662                                         ['id' => $arr['author-id']]);
1663                         }
1664                 }
1665         }
1666
1667         public static function setHashtags($body)
1668         {
1669                 $body = BBCode::performWithEscapedTags($body, ['noparse', 'pre', 'code', 'img'], function ($body) {
1670                         $tags = BBCode::getTags($body);
1671
1672                         // No hashtags?
1673                         if (!count($tags)) {
1674                                 return $body;
1675                         }
1676
1677                         // This sorting is important when there are hashtags that are part of other hashtags
1678                         // Otherwise there could be problems with hashtags like #test and #test2
1679                         // Because of this we are sorting from the longest to the shortest tag.
1680                         usort($tags, function ($a, $b) {
1681                                 return strlen($b) <=> strlen($a);
1682                         });
1683
1684                         $URLSearchString = "^\[\]";
1685
1686                         // All hashtags should point to the home server if "local_tags" is activated
1687                         if (DI::config()->get('system', 'local_tags')) {
1688                                 $body = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1689                                         "#[url=" . DI::baseUrl() . "/search?tag=$2]$2[/url]", $body);
1690                         }
1691
1692                         // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1693                         $body = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1694                                 function ($match) {
1695                                         return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1696                                 }, $body);
1697
1698                         $body = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1699                                 function ($match) {
1700                                         return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1701                                 }, $body);
1702
1703                         $body = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1704                                 function ($match) {
1705                                         return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1706                                 }, $body);
1707
1708                         // Repair recursive urls
1709                         $body = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1710                                 "&num;$2", $body);
1711
1712                         foreach ($tags as $tag) {
1713                                 if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=') || strlen($tag) < 2 || $tag[1] == '#') {
1714                                         continue;
1715                                 }
1716
1717                                 $basetag = str_replace('_', ' ', substr($tag, 1));
1718                                 $newtag = '#[url=' . DI::baseUrl() . '/search?tag=' . $basetag . ']' . $basetag . '[/url]';
1719
1720                                 $body = str_replace($tag, $newtag, $body);
1721                         }
1722
1723                         // Convert back the masked hashtags
1724                         $body = str_replace("&num;", "#", $body);
1725
1726                         return $body;
1727                 });
1728
1729                 return $body;
1730         }
1731
1732         /**
1733          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1734          *
1735          * @param int $uid
1736          * @param int $item_id
1737          * @return boolean true if item was deleted, else false
1738          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1739          * @throws \ImagickException
1740          */
1741         private static function tagDeliver($uid, $item_id)
1742         {
1743                 $mention = false;
1744
1745                 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
1746                 if (!DBA::isResult($user)) {
1747                         return false;
1748                 }
1749
1750                 $community_page = (($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) ? true : false);
1751                 $prvgroup = (($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) ? true : false);
1752
1753                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
1754                 if (!DBA::isResult($item)) {
1755                         return false;
1756                 }
1757
1758                 $link = Strings::normaliseLink(DI::baseUrl() . '/profile/' . $user['nickname']);
1759
1760                 /*
1761                  * Diaspora uses their own hardwired link URL in @-tags
1762                  * instead of the one we supply with webfinger
1763                  */
1764                 $dlink = Strings::normaliseLink(DI::baseUrl() . '/u/' . $user['nickname']);
1765
1766                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1767                 if ($cnt) {
1768                         foreach ($matches as $mtch) {
1769                                 if (Strings::compareLink($link, $mtch[1]) || Strings::compareLink($dlink, $mtch[1])) {
1770                                         $mention = true;
1771                                         Logger::log('mention found: ' . $mtch[2]);
1772                                 }
1773                         }
1774                 }
1775
1776                 if (!$mention) {
1777                         $tags = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
1778                         foreach ($tags as $tag) {
1779                                 if (Strings::compareLink($link, $tag['url']) || Strings::compareLink($dlink, $tag['url'])) {
1780                                         $mention = true;
1781                                         DI::logger()->info('mention found in tag.', ['url' => $tag['url']]);
1782                                 }
1783                         }
1784                 }
1785
1786                 if (!$mention) {
1787                         if (($community_page || $prvgroup) &&
1788                                   !$item['wall'] && !$item['origin'] && ($item['gravity'] == GRAVITY_PARENT)) {
1789                                 Logger::info('Delete private group/communiy top-level item without mention', ['id' => $item['id'], 'guid'=> $item['guid']]);
1790                                 Post\User::delete(['uri-id' => $item['uri-id'], 'uid' => $item['uid']]);
1791                                 return true;
1792                         }
1793                         return false;
1794                 }
1795
1796                 $arr = ['item' => $item, 'user' => $user];
1797
1798                 Hook::callAll('tagged', $arr);
1799
1800                 if (!$community_page && !$prvgroup) {
1801                         return false;
1802                 }
1803
1804                 /*
1805                  * tgroup delivery - setup a second delivery chain
1806                  * prevent delivery looping - only proceed
1807                  * if the message originated elsewhere and is a top-level post
1808                  */
1809                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
1810                         return false;
1811                 }
1812
1813                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
1814                 $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
1815                 if (!DBA::isResult($self)) {
1816                         return false;
1817                 }
1818
1819                 $owner_id = Contact::getIdForURL($self['url']);
1820
1821                 // also reset all the privacy bits to the forum default permissions
1822
1823                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? self::PRIVATE : self::PUBLIC;
1824
1825                 $psid = PermissionSet::getIdFromACL(
1826                         $user['uid'],
1827                         $user['allow_cid'],
1828                         $user['allow_gid'],
1829                         $user['deny_cid'],
1830                         $user['deny_gid']
1831                 );
1832
1833                 $forum_mode = ($prvgroup ? 2 : 1);
1834
1835                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
1836                         'owner-id' => $owner_id, 'private' => $private, 'psid' => $psid];
1837                 self::update($fields, ['id' => $item['id']]);
1838
1839                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', Delivery::POST, (int)$item['uri-id'], (int)$item['uid']);
1840
1841                 self::performActivity($item['id'], 'announce', $uid);
1842
1843                 return false;
1844         }
1845
1846         /**
1847          * Automatically reshare the item if the "remote_self" option is selected
1848          *
1849          * @param array $item
1850          * @return void
1851          */
1852         private static function autoReshare(array $item)
1853         {
1854                 if ($item['gravity'] != GRAVITY_PARENT) {
1855                         return;
1856                 }
1857
1858                 if (!DBA::exists('contact', ['id' => $item['contact-id'], 'remote_self' => Contact::MIRROR_NATIVE_RESHARE])) {
1859                         return;
1860                 }
1861
1862                 if (!in_array($item['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN])) {
1863                         return;
1864                 }
1865
1866                 Logger::info('Automatically reshare item', ['uid' => $item['uid'], 'id' => $item['id'], 'guid' => $item['guid'], 'uri-id' => $item['uri-id']]);
1867
1868                 self::performActivity($item['id'], 'announce', $item['uid']);
1869         }
1870
1871         public static function isRemoteSelf($contact, &$datarray)
1872         {
1873                 if (!$contact['remote_self']) {
1874                         return false;
1875                 }
1876
1877                 // Prevent the forwarding of posts that are forwarded
1878                 if (!empty($datarray["extid"]) && ($datarray["extid"] == Protocol::DFRN)) {
1879                         Logger::info('Already forwarded');
1880                         return false;
1881                 }
1882
1883                 // Prevent to forward already forwarded posts
1884                 if ($datarray["app"] == DI::baseUrl()->getHostname()) {
1885                         Logger::info('Already forwarded (second test)');
1886                         return false;
1887                 }
1888
1889                 // Only forward posts
1890                 if ($datarray["verb"] != Activity::POST) {
1891                         Logger::info('No post');
1892                         return false;
1893                 }
1894
1895                 if (($contact['network'] != Protocol::FEED) && ($datarray['private'] == self::PRIVATE)) {
1896                         Logger::info('Not public');
1897                         return false;
1898                 }
1899
1900                 $datarray2 = $datarray;
1901                 Logger::info('remote-self start', ['contact' => $contact['url'], 'remote_self'=> $contact['remote_self'], 'item' => $datarray]);
1902                 if ($contact['remote_self'] == Contact::MIRROR_OWN_POST) {
1903                         $self = DBA::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
1904                                         ['uid' => $contact['uid'], 'self' => true]);
1905                         if (DBA::isResult($self)) {
1906                                 $datarray['contact-id'] = $self["id"];
1907
1908                                 $datarray['owner-name'] = $self["name"];
1909                                 $datarray['owner-link'] = $self["url"];
1910                                 $datarray['owner-avatar'] = $self["thumb"];
1911
1912                                 $datarray['author-name']   = $datarray['owner-name'];
1913                                 $datarray['author-link']   = $datarray['owner-link'];
1914                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
1915
1916                                 unset($datarray['edited']);
1917
1918                                 unset($datarray['network']);
1919                                 unset($datarray['owner-id']);
1920                                 unset($datarray['author-id']);
1921                         }
1922
1923                         if ($contact['network'] != Protocol::FEED) {
1924                                 $old_uri_id = $datarray["uri-id"] ?? 0;
1925                                 $datarray["guid"] = System::createUUID();
1926                                 unset($datarray["plink"]);
1927                                 $datarray["uri"] = self::newURI($contact['uid'], $datarray["guid"]);
1928                                 $datarray["uri-id"] = ItemURI::getIdByURI($datarray["uri"]);
1929                                 $datarray["extid"] = Protocol::DFRN;
1930                                 $urlpart = parse_url($datarray2['author-link']);
1931                                 $datarray["app"] = $urlpart["host"];
1932                                 if (!empty($old_uri_id)) {
1933                                         Post\Media::copy($old_uri_id, $datarray["uri-id"]);
1934                                 }
1935
1936                                 unset($datarray["parent-uri"]);
1937                                 unset($datarray["thr-parent"]);
1938                         } else {
1939                                 $datarray['private'] = self::PUBLIC;
1940                         }
1941                 }
1942
1943                 if ($contact['network'] != Protocol::FEED) {
1944                         // Store the original post
1945                         $result = self::insert($datarray2);
1946                         Logger::info('remote-self post original item', ['contact' => $contact['url'], 'result'=> $result, 'item' => $datarray2]);
1947                 } else {
1948                         $datarray["app"] = "Feed";
1949                         $result = true;
1950                 }
1951
1952                 // Trigger automatic reactions for addons
1953                 $datarray['api_source'] = true;
1954
1955                 // We have to tell the hooks who we are - this really should be improved
1956                 $_SESSION['authenticated'] = true;
1957                 $_SESSION['uid'] = $contact['uid'];
1958
1959                 return (bool)$result;
1960         }
1961
1962         /**
1963          *
1964          * @param string $s
1965          * @param int    $uid
1966          * @param array  $item
1967          * @param int    $cid
1968          * @return string
1969          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1970          * @throws \ImagickException
1971          */
1972         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
1973         {
1974                 if (DI::config()->get('system', 'disable_embedded')) {
1975                         return $s;
1976                 }
1977
1978                 Logger::info('check for photos');
1979                 $site = substr(DI::baseUrl(), strpos(DI::baseUrl(), '://'));
1980
1981                 $orig_body = $s;
1982                 $new_body = '';
1983
1984                 $img_start = strpos($orig_body, '[img');
1985                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
1986                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
1987
1988                 while (($img_st_close !== false) && ($img_len !== false)) {
1989                         $img_st_close++; // make it point to AFTER the closing bracket
1990                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
1991
1992                         Logger::info('found photo', ['image' => $image]);
1993
1994                         if (stristr($image, $site . '/photo/')) {
1995                                 // Only embed locally hosted photos
1996                                 $replace = false;
1997                                 $i = basename($image);
1998                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
1999                                 $x = strpos($i, '-');
2000
2001                                 if ($x) {
2002                                         $res = substr($i, $x + 1);
2003                                         $i = substr($i, 0, $x);
2004                                         $photo = Photo::getPhotoForUser($uid, $i, $res);
2005                                         if (DBA::isResult($photo)) {
2006                                                 /*
2007                                                  * Check to see if we should replace this photo link with an embedded image
2008                                                  * 1. No need to do so if the photo is public
2009                                                  * 2. If there's a contact-id provided, see if they're in the access list
2010                                                  *    for the photo. If so, embed it.
2011                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
2012                                                  *    permissions, regardless of order but first check to see if they're an exact
2013                                                  *    match to save some processing overhead.
2014                                                  */
2015                                                 if (self::hasPermissions($photo)) {
2016                                                         if ($cid) {
2017                                                                 $recips = self::enumeratePermissions($photo);
2018                                                                 if (in_array($cid, $recips)) {
2019                                                                         $replace = true;
2020                                                                 }
2021                                                         } elseif ($item) {
2022                                                                 if (self::samePermissions($uid, $item, $photo)) {
2023                                                                         $replace = true;
2024                                                                 }
2025                                                         }
2026                                                 }
2027                                                 if ($replace) {
2028                                                         $photo_img = Photo::getImageForPhoto($photo);
2029                                                         // If a custom width and height were specified, apply before embedding
2030                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
2031                                                                 Logger::info('scaling photo');
2032
2033                                                                 $width = intval($match[1]);
2034                                                                 $height = intval($match[2]);
2035
2036                                                                 $photo_img->scaleDown(max($width, $height));
2037                                                         }
2038
2039                                                         $data = $photo_img->asString();
2040                                                         $type = $photo_img->getType();
2041
2042                                                         Logger::info('replacing photo');
2043                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
2044                                                         Logger::debug('replaced', ['image' => $image]);
2045                                                 }
2046                                         }
2047                                 }
2048                         }
2049
2050                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
2051                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
2052                         if ($orig_body === false) {
2053                                 $orig_body = '';
2054                         }
2055
2056                         $img_start = strpos($orig_body, '[img');
2057                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
2058                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
2059                 }
2060
2061                 $new_body = $new_body . $orig_body;
2062
2063                 return $new_body;
2064         }
2065
2066         private static function hasPermissions($obj)
2067         {
2068                 return !empty($obj['allow_cid']) || !empty($obj['allow_gid']) ||
2069                         !empty($obj['deny_cid']) || !empty($obj['deny_gid']);
2070         }
2071
2072         private static function samePermissions($uid, $obj1, $obj2)
2073         {
2074                 // first part is easy. Check that these are exactly the same.
2075                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
2076                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
2077                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
2078                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
2079                         return true;
2080                 }
2081
2082                 // This is harder. Parse all the permissions and compare the resulting set.
2083                 $recipients1 = self::enumeratePermissions($obj1);
2084                 $recipients2 = self::enumeratePermissions($obj2);
2085                 sort($recipients1);
2086                 sort($recipients2);
2087
2088                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
2089                 return ($recipients1 == $recipients2);
2090         }
2091
2092         /**
2093          * Returns an array of contact-ids that are allowed to see this object
2094          *
2095          * @param array $obj        Item array with at least uid, allow_cid, allow_gid, deny_cid and deny_gid
2096          * @param bool  $check_dead Prunes unavailable contacts from the result
2097          * @return array
2098          * @throws \Exception
2099          */
2100         public static function enumeratePermissions(array $obj, bool $check_dead = false)
2101         {
2102                 $aclFormater = DI::aclFormatter();
2103
2104                 $allow_people = $aclFormater->expand($obj['allow_cid']);
2105                 $allow_groups = Group::expand($obj['uid'], $aclFormater->expand($obj['allow_gid']), $check_dead);
2106                 $deny_people  = $aclFormater->expand($obj['deny_cid']);
2107                 $deny_groups  = Group::expand($obj['uid'], $aclFormater->expand($obj['deny_gid']), $check_dead);
2108                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
2109                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
2110                 $recipients   = array_diff($recipients, $deny);
2111                 return $recipients;
2112         }
2113
2114         public static function expire(int $uid, int $days, string $network = "", bool $force = false)
2115         {
2116                 if (!$uid || ($days < 1)) {
2117                         return;
2118                 }
2119
2120                 $condition = ["`uid` = ? AND NOT `deleted` AND `gravity` = ?",
2121                         $uid, GRAVITY_PARENT];
2122
2123                 /*
2124                  * $expire_network_only = save your own wall posts
2125                  * and just expire conversations started by others
2126                  */
2127                 $expire_network_only = DI::pConfig()->get($uid, 'expire', 'network_only', false);
2128
2129                 if ($expire_network_only) {
2130                         $condition[0] .= " AND NOT `wall`";
2131                 }
2132
2133                 if ($network != "") {
2134                         $condition[0] .= " AND `network` = ?";
2135                         $condition[] = $network;
2136                 }
2137
2138                 $condition[0] .= " AND `received` < UTC_TIMESTAMP() - INTERVAL ? DAY";
2139                 $condition[] = $days;
2140
2141                 $items = Post::select(['resource-id', 'starred', 'id', 'post-type', 'uid', 'uri-id'], $condition);
2142
2143                 if (!DBA::isResult($items)) {
2144                         return;
2145                 }
2146
2147                 $expire_items = DI::pConfig()->get($uid, 'expire', 'items', true);
2148
2149                 // Forcing expiring of items - but not notes and marked items
2150                 if ($force) {
2151                         $expire_items = true;
2152                 }
2153
2154                 $expire_notes = DI::pConfig()->get($uid, 'expire', 'notes', true);
2155                 $expire_starred = DI::pConfig()->get($uid, 'expire', 'starred', true);
2156                 $expire_photos = DI::pConfig()->get($uid, 'expire', 'photos', false);
2157
2158                 $expired = 0;
2159
2160                 $priority = DI::config()->get('system', 'expire-notify-priority');
2161
2162                 while ($item = Post::fetch($items)) {
2163                         // don't expire filed items
2164                         if (DBA::exists('post-category', ['uri-id' => $item['uri-id'], 'uid' => $item['uid'], 'type' => Post\Category::FILE])) {
2165                                 continue;
2166                         }
2167
2168                         // Only expire posts, not photos and photo comments
2169
2170                         if (!$expire_photos && !empty($item['resource-id'])) {
2171                                 continue;
2172                         } elseif (!$expire_starred && intval($item['starred'])) {
2173                                 continue;
2174                         } elseif (!$expire_notes && ($item['post-type'] == self::PT_PERSONAL_NOTE)) {
2175                                 continue;
2176                         } elseif (!$expire_items && ($item['post-type'] != self::PT_PERSONAL_NOTE)) {
2177                                 continue;
2178                         }
2179
2180                         self::markForDeletionById($item['id'], $priority);
2181
2182                         ++$expired;
2183                 }
2184                 DBA::close($items);
2185                 Logger::log('User ' . $uid . ": expired $expired items; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
2186         }
2187
2188         public static function firstPostDate($uid, $wall = false)
2189         {
2190                 $user = User::getById($uid, ['register_date']);
2191                 if (empty($user)) {
2192                         return false;
2193                 }
2194
2195                 $condition = ["`uid` = ? AND `wall` = ? AND NOT `deleted` AND `visible` AND `received` >= ?",
2196                         $uid, $wall, $user['register_date']];
2197                 $params = ['order' => ['received' => false]];
2198                 $thread = Post::selectFirstThread(['received'], $condition, $params);
2199                 if (DBA::isResult($thread)) {
2200                         $postdate = substr(DateTimeFormat::local($thread['received']), 0, 10);
2201                         return $postdate;
2202                 }
2203                 return false;
2204         }
2205
2206         /**
2207          * add/remove activity to an item
2208          *
2209          * Toggle activities as like,dislike,attend of an item
2210          *
2211          * @param int $item_id
2212          * @param string $verb
2213          *            Activity verb. One of
2214          *            like, unlike, dislike, undislike, attendyes, unattendyes,
2215          *            attendno, unattendno, attendmaybe, unattendmaybe,
2216          *            announce, unannouce
2217          * @return bool
2218          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2219          * @throws \ImagickException
2220          * @hook  'post_local_end'
2221          *            array $arr
2222          *            'post_id' => ID of posted item
2223          */
2224         public static function performActivity(int $item_id, string $verb, int $uid)
2225         {
2226                 if (empty($uid)) {
2227                         return false;
2228                 }
2229
2230                 Logger::notice('Start create activity', ['verb' => $verb, 'item' => $item_id, 'user' => $uid]);
2231
2232                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $item_id]);
2233                 if (!DBA::isResult($item)) {
2234                         Logger::log('like: unknown item ' . $item_id);
2235                         return false;
2236                 }
2237
2238                 $uri_id = $item['uri-id'];
2239
2240                 if (!in_array($item['uid'], [0, $uid])) {
2241                         return false;
2242                 }
2243
2244                 if (!Post::exists(['uri-id' => $item['parent-uri-id'], 'uid' => $uid])) {
2245                         $stored = self::storeForUserByUriId($item['parent-uri-id'], $uid);
2246                         if (($item['parent-uri-id'] == $item['uri-id']) && !empty($stored)) {
2247                                 $item = Post::selectFirst(self::ITEM_FIELDLIST, ['id' => $stored]);
2248                                 if (!DBA::isResult($item)) {
2249                                         Logger::info('Could not fetch just created item - should not happen', ['stored' => $stored, 'uid' => $uid, 'uri-id' => $uri_id]);
2250                                         return false;
2251                                 }
2252                         }
2253                 }
2254
2255                 // Retrieves the local post owner
2256                 $owner = User::getOwnerDataById($uid);
2257                 if (empty($owner)) {
2258                         Logger::info('Empty owner for user', ['uid' => $uid]);
2259                         return false;
2260                 }
2261
2262                 // Retrieve the current logged in user's public contact
2263                 $author_id = Contact::getIdForURL($owner['url']);
2264                 if (empty($author_id)) {
2265                         Logger::info('Empty public contact');
2266                         return false;
2267                 }
2268
2269                 $activity = null;
2270                 switch ($verb) {
2271                         case 'like':
2272                         case 'unlike':
2273                                 $activity = Activity::LIKE;
2274                                 break;
2275                         case 'dislike':
2276                         case 'undislike':
2277                                 $activity = Activity::DISLIKE;
2278                                 break;
2279                         case 'attendyes':
2280                         case 'unattendyes':
2281                                 $activity = Activity::ATTEND;
2282                                 break;
2283                         case 'attendno':
2284                         case 'unattendno':
2285                                 $activity = Activity::ATTENDNO;
2286                                 break;
2287                         case 'attendmaybe':
2288                         case 'unattendmaybe':
2289                                 $activity = Activity::ATTENDMAYBE;
2290                                 break;
2291                         case 'follow':
2292                         case 'unfollow':
2293                                 $activity = Activity::FOLLOW;
2294                                 break;
2295                         case 'announce':
2296                         case 'unannounce':
2297                                 $activity = Activity::ANNOUNCE;
2298                                 break;
2299                         default:
2300                                 Logger::notice('unknown verb', ['verb' => $verb, 'item' => $item_id]);
2301                                 return false;
2302                 }
2303
2304                 $mode = Strings::startsWith($verb, 'un') ? 'delete' : 'create';
2305
2306                 // Enable activity toggling instead of on/off
2307                 $event_verb_flag = $activity === Activity::ATTEND || $activity === Activity::ATTENDNO || $activity === Activity::ATTENDMAYBE;
2308
2309                 // Look for an existing verb row
2310                 // Event participation activities are mutually exclusive, only one of them can exist at all times.
2311                 if ($event_verb_flag) {
2312                         $verbs = [Activity::ATTEND, Activity::ATTENDNO, Activity::ATTENDMAYBE];
2313
2314                         // Translate to the index based activity index
2315                         $vids = [];
2316                         foreach ($verbs as $verb) {
2317                                 $vids[] = Verb::getID($verb);
2318                         }
2319                 } else {
2320                         $vids = Verb::getID($activity);
2321                 }
2322
2323                 $condition = ['vid' => $vids, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY,
2324                         'author-id' => $author_id, 'uid' => $item['uid'], 'thr-parent-id' => $uri_id];
2325                 $like_item = Post::selectFirst(['id', 'guid', 'verb'], $condition);
2326
2327                 if (DBA::isResult($like_item)) {
2328                         /**
2329                          * Truth table for existing activities
2330                          *
2331                          * |          Inputs            ||      Outputs      |
2332                          * |----------------------------||-------------------|
2333                          * |  Mode  | Event | Same verb || Delete? | Return? |
2334                          * |--------|-------|-----------||---------|---------|
2335                          * | create |  Yes  |    Yes    ||   No    |   Yes   |
2336                          * | create |  Yes  |    No     ||   Yes   |   No    |
2337                          * | create |  No   |    Yes    ||   No    |   Yes   |
2338                          * | create |  No   |    No     ||        N/A†       |
2339                          * | delete |  Yes  |    Yes    ||   Yes   |   N/A‡  |
2340                          * | delete |  Yes  |    No     ||   No    |   N/A‡  |
2341                          * | delete |  No   |    Yes    ||   Yes   |   N/A‡  |
2342                          * | delete |  No   |    No     ||        N/A†       |
2343                          * |--------|-------|-----------||---------|---------|
2344                          * |   A    |   B   |     C     || A xor C | !B or C |
2345                          *
2346                          * † Can't happen: It's impossible to find an existing non-event activity without
2347                          *                 the same verb because we are only looking for this single verb.
2348                          *
2349                          * ‡ The "mode = delete" is returning early whether an existing activity was found or not.
2350                          */
2351                         if ($mode == 'create' xor $like_item['verb'] == $activity) {
2352                                 self::markForDeletionById($like_item['id']);
2353                         }
2354
2355                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
2356                                 return true;
2357                         }
2358                 }
2359
2360                 // No need to go further if we aren't creating anything
2361                 if ($mode == 'delete') {
2362                         return true;
2363                 }
2364
2365                 $objtype = $item['resource-id'] ? Activity\ObjectType::IMAGE : Activity\ObjectType::NOTE;
2366
2367                 $new_item = [
2368                         'guid'          => System::createUUID(),
2369                         'uri'           => self::newURI($item['uid']),
2370                         'uid'           => $item['uid'],
2371                         'contact-id'    => $owner['id'],
2372                         'wall'          => $item['wall'],
2373                         'origin'        => 1,
2374                         'network'       => Protocol::DFRN,
2375                         'protocol'      => Conversation::PARCEL_DIRECT,
2376                         'direction'     => Conversation::PUSH,
2377                         'gravity'       => GRAVITY_ACTIVITY,
2378                         'parent'        => $item['id'],
2379                         'thr-parent'    => $item['uri'],
2380                         'owner-id'      => $author_id,
2381                         'author-id'     => $author_id,
2382                         'body'          => $activity,
2383                         'verb'          => $activity,
2384                         'object-type'   => $objtype,
2385                         'allow_cid'     => $item['allow_cid'],
2386                         'allow_gid'     => $item['allow_gid'],
2387                         'deny_cid'      => $item['deny_cid'],
2388                         'deny_gid'      => $item['deny_gid'],
2389                         'visible'       => 1,
2390                         'unseen'        => 1,
2391                 ];
2392
2393                 $signed = Diaspora::createLikeSignature($uid, $new_item);
2394                 if (!empty($signed)) {
2395                         $new_item['diaspora_signed_text'] = json_encode($signed);
2396                 }
2397
2398                 $new_item_id = self::insert($new_item);
2399
2400                 // If the parent item isn't visible then set it to visible
2401                 if (!$item['visible']) {
2402                         self::update(['visible' => true], ['id' => $item['id']]);
2403                 }
2404
2405                 $new_item['id'] = $new_item_id;
2406
2407                 Hook::callAll('post_local_end', $new_item);
2408
2409                 return true;
2410         }
2411
2412         /**
2413          * Fetch the SQL condition for the given user id
2414          *
2415          * @param integer $owner_id User ID for which the permissions should be fetched
2416          * @return array condition
2417          */
2418         public static function getPermissionsConditionArrayByUserId(int $owner_id)
2419         {
2420                 $local_user = local_user();
2421                 $remote_user = Session::getRemoteContactID($owner_id);
2422
2423                 // default permissions - anonymous user
2424                 $condition = ["`private` != ?", self::PRIVATE];
2425
2426                 if ($local_user && ($local_user == $owner_id)) {
2427                         // Profile owner - everything is visible
2428                         $condition = [];
2429                 } elseif ($remote_user) {
2430                          // Authenticated visitor - fetch the matching permissionsets
2431                         $set = PermissionSet::get($owner_id, $remote_user);
2432                         if (!empty($set)) {
2433                                 $condition = ["(`private` != ? OR (`private` = ? AND `wall`
2434                                         AND `psid` IN (" . implode(', ', array_fill(0, count($set), '?')) . ")))",
2435                                         self::PRIVATE, self::PRIVATE];
2436                                 $condition = array_merge($condition, $set);
2437                         }
2438                 }
2439
2440                 return $condition;
2441         }
2442
2443         /**
2444          * Get a permission SQL string for the given user
2445          *
2446          * @param int $owner_id
2447          * @param string $table
2448          * @return string
2449          */
2450         public static function getPermissionsSQLByUserId(int $owner_id, string $table = '')
2451         {
2452                 $local_user = local_user();
2453                 $remote_user = Session::getRemoteContactID($owner_id);
2454
2455                 if (!empty($table)) {
2456                         $table = DBA::quoteIdentifier($table) . '.';
2457                 }
2458
2459                 /*
2460                  * Construct permissions
2461                  *
2462                  * default permissions - anonymous user
2463                  */
2464                 $sql = sprintf(" AND " . $table . "`private` != %d", self::PRIVATE);
2465
2466                 // Profile owner - everything is visible
2467                 if ($local_user && ($local_user == $owner_id)) {
2468                         $sql = '';
2469                 } elseif ($remote_user) {
2470                         /*
2471                          * Authenticated visitor. Unless pre-verified,
2472                          * check that the contact belongs to this $owner_id
2473                          * and load the groups the visitor belongs to.
2474                          * If pre-verified, the caller is expected to have already
2475                          * done this and passed the groups into this function.
2476                          */
2477                         $set = PermissionSet::get($owner_id, $remote_user);
2478
2479                         if (!empty($set)) {
2480                                 $sql_set = sprintf(" OR (" . $table . "`private` = %d AND " . $table . "`wall` AND " . $table . "`psid` IN (", self::PRIVATE) . implode(',', $set) . "))";
2481                         } else {
2482                                 $sql_set = '';
2483                         }
2484
2485                         $sql = sprintf(" AND (" . $table . "`private` != %d", self::PRIVATE) . $sql_set . ")";
2486                 }
2487
2488                 return $sql;
2489         }
2490
2491         /**
2492          * get translated item type
2493          *
2494          * @param array                $item
2495          * @param \Friendica\Core\L10n $l10n
2496          * @return string
2497          */
2498         public static function postType(array $item, \Friendica\Core\L10n $l10n)
2499         {
2500                 if (!empty($item['event-id'])) {
2501                         return $l10n->t('event');
2502                 } elseif (!empty($item['resource-id'])) {
2503                         return $l10n->t('photo');
2504                 } elseif ($item['gravity'] == GRAVITY_ACTIVITY) {
2505                         return $l10n->t('activity');
2506                 } elseif ($item['gravity'] == GRAVITY_COMMENT) {
2507                         return $l10n->t('comment');
2508                 }
2509
2510                 return $l10n->t('post');
2511         }
2512
2513         /**
2514          * Sets the "rendered-html" field of the provided item
2515          *
2516          * Body is preserved to avoid side-effects as we modify it just-in-time for spoilers and private image links
2517          *
2518          * @param array $item
2519          *
2520          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2521          * @todo Remove reference, simply return "rendered-html" and "rendered-hash"
2522          */
2523         public static function putInCache(&$item)
2524         {
2525                 // Save original body to prevent addons to modify it
2526                 $body = $item['body'];
2527
2528                 $rendered_hash = $item['rendered-hash'] ?? '';
2529                 $rendered_html = $item['rendered-html'] ?? '';
2530
2531                 if ($rendered_hash == ''
2532                         || $rendered_html == ''
2533                         || $rendered_hash != hash('md5', BBCode::VERSION . '::' . $body)
2534                         || DI::config()->get('system', 'ignore_cache')
2535                 ) {
2536                         self::addRedirToImageTags($item);
2537
2538                         $item['rendered-html'] = BBCode::convert($item['body']);
2539                         $item['rendered-hash'] = hash('md5', BBCode::VERSION . '::' . $body);
2540
2541                         $hook_data = ['item' => $item, 'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2542                         Hook::callAll('put_item_in_cache', $hook_data);
2543                         $item['rendered-html'] = $hook_data['rendered-html'];
2544                         $item['rendered-hash'] = $hook_data['rendered-hash'];
2545                         unset($hook_data);
2546
2547                         // Update if the generated values differ from the existing ones
2548                         if ((($rendered_hash != $item['rendered-hash']) || ($rendered_html != $item['rendered-html'])) && !empty($item['id'])) {
2549                                 self::update(
2550                                         [
2551                                                 'rendered-html' => $item['rendered-html'],
2552                                                 'rendered-hash' => $item['rendered-hash']
2553                                         ],
2554                                         ['id' => $item['id']]
2555                                 );
2556                         }
2557                 }
2558
2559                 $item['body'] = $body;
2560         }
2561
2562         /**
2563          * Find any non-embedded images in private items and add redir links to them
2564          *
2565          * @param array &$item The field array of an item row
2566          */
2567         private static function addRedirToImageTags(array &$item)
2568         {
2569                 $app = DI::app();
2570
2571                 $matches = [];
2572                 $cnt = preg_match_all('|\[img\](http[^\[]*?/photo/[a-fA-F0-9]+?(-[0-9]\.[\w]+?)?)\[\/img\]|', $item['body'], $matches, PREG_SET_ORDER);
2573                 if ($cnt) {
2574                         foreach ($matches as $mtch) {
2575                                 if (strpos($mtch[1], '/redir') !== false) {
2576                                         continue;
2577                                 }
2578
2579                                 if ((local_user() == $item['uid']) && ($item['private'] == self::PRIVATE) && ($item['contact-id'] != $app->contact['id']) && ($item['network'] == Protocol::DFRN)) {
2580                                         $img_url = 'redir/' . $item['contact-id'] . '?url=' . urlencode($mtch[1]);
2581                                         $item['body'] = str_replace($mtch[0], '[img]' . $img_url . '[/img]', $item['body']);
2582                                 }
2583                         }
2584                 }
2585         }
2586
2587         /**
2588          * Given an item array, convert the body element from bbcode to html and add smilie icons.
2589          * If attach is true, also add icons for item attachments.
2590          *
2591          * @param array   $item
2592          * @param boolean $attach
2593          * @param boolean $is_preview
2594          * @return string item body html
2595          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
2596          * @throws \ImagickException
2597          * @hook  prepare_body_init item array before any work
2598          * @hook  prepare_body_content_filter ('item'=>item array, 'filter_reasons'=>string array) before first bbcode to html
2599          * @hook  prepare_body ('item'=>item array, 'html'=>body string, 'is_preview'=>boolean, 'filter_reasons'=>string array) after first bbcode to html
2600          * @hook  prepare_body_final ('item'=>item array, 'html'=>body string) after attach icons and blockquote special case handling (spoiler, author)
2601          */
2602         public static function prepareBody(array &$item, $attach = false, $is_preview = false)
2603         {
2604                 $a = DI::app();
2605                 Hook::callAll('prepare_body_init', $item);
2606
2607                 // In order to provide theme developers more possibilities, event items
2608                 // are treated differently.
2609                 if ($item['object-type'] === Activity\ObjectType::EVENT && isset($item['event-id'])) {
2610                         $ev = Event::getItemHTML($item);
2611                         return $ev;
2612                 }
2613
2614                 $tags = Tag::populateFromItem($item);
2615
2616                 $item['tags'] = $tags['tags'];
2617                 $item['hashtags'] = $tags['hashtags'];
2618                 $item['mentions'] = $tags['mentions'];
2619
2620                 // Compile eventual content filter reasons
2621                 $filter_reasons = [];
2622                 if (!$is_preview && public_contact() != $item['author-id']) {
2623                         if (!empty($item['content-warning']) && (!local_user() || !DI::pConfig()->get(local_user(), 'system', 'disable_cw', false))) {
2624                                 $filter_reasons[] = DI::l10n()->t('Content warning: %s', $item['content-warning']);
2625                         }
2626
2627                         $hook_data = [
2628                                 'item' => $item,
2629                                 'filter_reasons' => $filter_reasons
2630                         ];
2631                         Hook::callAll('prepare_body_content_filter', $hook_data);
2632                         $filter_reasons = $hook_data['filter_reasons'];
2633                         unset($hook_data);
2634                 }
2635
2636                 self::putInCache($item);
2637                 $s = $item["rendered-html"];
2638
2639                 $hook_data = [
2640                         'item' => $item,
2641                         'html' => $s,
2642                         'preview' => $is_preview,
2643                         'filter_reasons' => $filter_reasons
2644                 ];
2645                 Hook::callAll('prepare_body', $hook_data);
2646                 $s = $hook_data['html'];
2647                 unset($hook_data);
2648
2649                 if (!$attach) {
2650                         // Replace the blockquotes with quotes that are used in mails.
2651                         $mailquote = '<blockquote type="cite" class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">';
2652                         $s = str_replace(['<blockquote>', '<blockquote class="spoiler">', '<blockquote class="author">'], [$mailquote, $mailquote, $mailquote], $s);
2653                         return $s;
2654                 }
2655
2656                 $s = self::addMediaAttachments($item, $s);
2657
2658                 // Map.
2659                 if (strpos($s, '<div class="map">') !== false && !empty($item['coord'])) {
2660                         $x = Map::byCoordinates(trim($item['coord']));
2661                         if ($x) {
2662                                 $s = preg_replace('/\<div class\=\"map\"\>/', '$0' . $x, $s);
2663                         }
2664                 }
2665
2666                 // Replace friendica image url size with theme preference.
2667                 if (!empty($a->theme_info['item_image_size'])) {
2668                         $ps = $a->theme_info['item_image_size'];
2669                         $s = preg_replace('|(<img[^>]+src="[^"]+/photo/[0-9a-f]+)-[0-9]|', "$1-" . $ps, $s);
2670                 }
2671
2672                 $s = HTML::applyContentFilter($s, $filter_reasons);
2673
2674                 $hook_data = ['item' => $item, 'html' => $s];
2675                 Hook::callAll('prepare_body_final', $hook_data);
2676
2677                 return $hook_data['html'];
2678         }
2679
2680         /**
2681          * Add media attachments to the content
2682          *
2683          * @param array $item
2684          * @param string $content
2685          * @return modified content
2686          */
2687         private static function addMediaAttachments(array $item, string $content)
2688         {
2689                 $leading = '';
2690                 $trailing = '';
2691                 // currently deactivated the request for Post\Media::VIDEO since it creates mutliple videos from Peertube
2692                 foreach (Post\Media::getByURIId($item['uri-id'], [Post\Media::AUDIO,
2693                         Post\Media::DOCUMENT, Post\Media::TORRENT, Post\Media::UNKNOWN]) as $attachment) {
2694                         if (in_array($attachment['type'], [Post\Media::AUDIO, Post\Media::VIDEO]) && strpos($item['body'], $attachment['url'])) {
2695                                 continue;
2696                         }
2697
2698                         $mime = $attachment['mimetype'];
2699
2700                         $author = ['uid' => 0, 'id' => $item['author-id'],
2701                                 'network' => $item['author-network'], 'url' => $item['author-link']];
2702                         $the_url = Contact::magicLinkByContact($author, $attachment['url']);
2703
2704                         $filetype = strtolower(substr($mime, 0, strpos($mime, '/')));
2705                         if ($filetype) {
2706                                 $filesubtype = strtolower(substr($mime, strpos($mime, '/') + 1));
2707                                 $filesubtype = str_replace('.', '-', $filesubtype);
2708                         } else {
2709                                 $filetype = 'unkn';
2710                                 $filesubtype = 'unkn';
2711                         }
2712
2713                         if (($filetype == 'video')) {
2714                                 /// @todo Move the template to /content as well
2715                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('video_top.tpl'), [
2716                                         '$video' => [
2717                                                 'id'     => $item['author-id'],
2718                                                 'src'    => $the_url,
2719                                                 'mime'   => $mime,
2720                                         ],
2721                                 ]);
2722                                 if ($item['post-type'] == Item::PT_VIDEO) {
2723                                         $leading .= $media;
2724                                 } else {
2725                                         $trailing .= $media;
2726                                 }
2727                         } elseif ($filetype == 'audio') {
2728                                 $media = Renderer::replaceMacros(Renderer::getMarkupTemplate('content/audio.tpl'), [
2729                                         '$audio' => [
2730                                                 'id'     => $item['author-id'],
2731                                                 'src'    => $the_url,
2732                                                 'mime'   => $mime,
2733                                         ],
2734                                 ]);
2735                                 if ($item['post-type'] == Item::PT_AUDIO) {
2736                                         $leading .= $media;
2737                                 } else {
2738                                         $trailing .= $media;
2739                                 }
2740                         } else {
2741                                 $title = Strings::escapeHtml(trim(($attachment['description'] ?? '') ?: $attachment['url']));
2742
2743                                 if (!empty($attachment['size'])) {
2744                                         $title .= ' ' . $attachment['size'] . ' ' . DI::l10n()->t('bytes');
2745                                 }
2746
2747                                 /// @todo Use a template
2748                                 $icon = '<div class="attachtype icon s22 type-' . $filetype . ' subtype-' . $filesubtype . '"></div>';
2749                                 $trailing .= '<a href="' . strip_tags($the_url) . '" title="' . $title . '" class="attachlink" target="_blank" rel="noopener noreferrer" >' . $icon . '</a>';
2750                         }
2751                 }
2752
2753                 if ($leading != '') {
2754                         $content = '<div class="body-attach">' . $leading . '<div class="clear"></div></div>' . $content;
2755                 }
2756
2757                 if ($trailing != '') {
2758                         $content .= '<div class="body-attach">' . $trailing . '<div class="clear"></div></div>';
2759                 }
2760
2761                 return $content;
2762         }
2763
2764         /**
2765          * get private link for item
2766          *
2767          * @param array $item
2768          * @return boolean|array False if item has not plink, otherwise array('href'=>plink url, 'title'=>translated title)
2769          * @throws \Exception
2770          */
2771         public static function getPlink($item)
2772         {
2773                 if (local_user()) {
2774                         $ret = [
2775                                 'href' => "display/" . $item['guid'],
2776                                 'orig' => "display/" . $item['guid'],
2777                                 'title' => DI::l10n()->t('View on separate page'),
2778                                 'orig_title' => DI::l10n()->t('view on separate page'),
2779                         ];
2780
2781                         if (!empty($item['plink'])) {
2782                                 $ret["href"] = DI::baseUrl()->remove($item['plink']);
2783                                 $ret["title"] = DI::l10n()->t('link to source');
2784                         }
2785                 } elseif (!empty($item['plink']) && ($item['private'] != self::PRIVATE)) {
2786                         $ret = [
2787                                 'href' => $item['plink'],
2788                                 'orig' => $item['plink'],
2789                                 'title' => DI::l10n()->t('link to source'),
2790                         ];
2791                 } else {
2792                         $ret = [];
2793                 }
2794
2795                 return $ret;
2796         }
2797
2798         /**
2799          * Is the given item array a post that is sent as starting post to a forum?
2800          *
2801          * @param array $item
2802          * @param array $owner
2803          *
2804          * @return boolean "true" when it is a forum post
2805          */
2806         public static function isForumPost(array $item, array $owner = [])
2807         {
2808                 if (empty($owner)) {
2809                         $owner = User::getOwnerDataById($item['uid']);
2810                         if (empty($owner)) {
2811                                 return false;
2812                         }
2813                 }
2814
2815                 if (($item['author-id'] == $item['owner-id']) ||
2816                         ($owner['id'] == $item['contact-id']) ||
2817                         ($item['uri-id'] != $item['parent-uri-id']) ||
2818                         $item['origin']) {
2819                         return false;
2820                 }
2821
2822                 return Contact::isForum($item['contact-id']);
2823         }
2824
2825         /**
2826          * Search item id for given URI or plink
2827          *
2828          * @param string $uri
2829          * @param integer $uid
2830          *
2831          * @return integer item id
2832          */
2833         public static function searchByLink($uri, $uid = 0)
2834         {
2835                 $ssl_uri = str_replace('http://', 'https://', $uri);
2836                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2837
2838                 $item = Post::selectFirst(['id'], ['uri' => $uris, 'uid' => $uid]);
2839                 if (DBA::isResult($item)) {
2840                         return $item['id'];
2841                 }
2842
2843                 $item = Post::selectFirst(['id'], ['plink' => $uris, 'uid' => $uid]);
2844                 if (DBA::isResult($item)) {
2845                         return $item['id'];
2846                 }
2847
2848                 return 0;
2849         }
2850
2851         /**
2852          * Return the URI for a link to the post
2853          *
2854          * @param string $uri URI or link to post
2855          *
2856          * @return string URI
2857          */
2858         public static function getURIByLink(string $uri)
2859         {
2860                 $ssl_uri = str_replace('http://', 'https://', $uri);
2861                 $uris = [$uri, $ssl_uri, Strings::normaliseLink($uri)];
2862
2863                 $item = Post::selectFirst(['uri'], ['uri' => $uris]);
2864                 if (DBA::isResult($item)) {
2865                         return $item['uri'];
2866                 }
2867
2868                 $item = Post::selectFirst(['uri'], ['plink' => $uris]);
2869                 if (DBA::isResult($item)) {
2870                         return $item['uri'];
2871                 }
2872
2873                 return '';
2874         }
2875
2876         /**
2877          * Fetches item for given URI or plink
2878          *
2879          * @param string $uri
2880          * @param integer $uid
2881          *
2882          * @return integer item id
2883          */
2884         public static function fetchByLink(string $uri, int $uid = 0)
2885         {
2886                 Logger::info('Trying to fetch link', ['uid' => $uid, 'uri' => $uri]);
2887                 $item_id = self::searchByLink($uri, $uid);
2888                 if (!empty($item_id)) {
2889                         Logger::info('Link found', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2890                         return $item_id;
2891                 }
2892
2893                 if ($fetched_uri = ActivityPub\Processor::fetchMissingActivity($uri)) {
2894                         $item_id = self::searchByLink($fetched_uri, $uid);
2895                 } else {
2896                         $item_id = Diaspora::fetchByURL($uri);
2897                 }
2898
2899                 if (!empty($item_id)) {
2900                         Logger::info('Link fetched', ['uid' => $uid, 'uri' => $uri, 'id' => $item_id]);
2901                         return $item_id;
2902                 }
2903
2904                 Logger::info('Link not found', ['uid' => $uid, 'uri' => $uri]);
2905                 return 0;
2906         }
2907
2908         /**
2909          * Return share data from an item array (if the item is shared item)
2910          * We are providing the complete Item array, because at some time in the future
2911          * we hopefully will define these values not in the body anymore but in some item fields.
2912          * This function is meant to replace all similar functions in the system.
2913          *
2914          * @param array $item
2915          *
2916          * @return array with share information
2917          */
2918         public static function getShareArray($item)
2919         {
2920                 if (!preg_match("/(.*?)\[share(.*?)\]\s?(.*?)\s?\[\/share\]\s?/ism", $item['body'], $matches)) {
2921                         return [];
2922                 }
2923
2924                 $attribute_string = $matches[2];
2925                 $attributes = ['comment' => trim($matches[1]), 'shared' => trim($matches[3])];
2926                 foreach (['author', 'profile', 'avatar', 'guid', 'posted', 'link'] as $field) {
2927                         if (preg_match("/$field=(['\"])(.+?)\\1/ism", $attribute_string, $matches)) {
2928                                 $attributes[$field] = trim(html_entity_decode($matches[2] ?? '', ENT_QUOTES, 'UTF-8'));
2929                         }
2930                 }
2931                 return $attributes;
2932         }
2933
2934         /**
2935          * Fetch item information for shared items from the original items and adds it.
2936          *
2937          * @param array $item
2938          *
2939          * @return array item array with data from the original item
2940          */
2941         public static function addShareDataFromOriginal(array $item)
2942         {
2943                 $shared = self::getShareArray($item);
2944                 if (empty($shared)) {
2945                         return $item;
2946                 }
2947
2948                 // Real reshares always have got a GUID.
2949                 if (empty($shared['guid'])) {
2950                         return $item;
2951                 }
2952
2953                 $uid = $item['uid'] ?? 0;
2954
2955                 // first try to fetch the item via the GUID. This will work for all reshares that had been created on this system
2956                 $shared_item = Post::selectFirst(['title', 'body'], ['guid' => $shared['guid'], 'uid' => [0, $uid]]);
2957                 if (!DBA::isResult($shared_item)) {
2958                         if (empty($shared['link'])) {
2959                                 return $item;
2960                         }
2961
2962                         // Otherwhise try to find (and possibly fetch) the item via the link. This should work for Diaspora and ActivityPub posts
2963                         $id = self::fetchByLink($shared['link'] ?? '', $uid);
2964                         if (empty($id)) {
2965                                 Logger::info('Original item not found', ['url' => $shared['link'] ?? '', 'callstack' => System::callstack()]);
2966                                 return $item;
2967                         }
2968
2969                         $shared_item = Post::selectFirst(['title', 'body'], ['id' => $id]);
2970                         if (!DBA::isResult($shared_item)) {
2971                                 return $item;
2972                         }
2973                         Logger::info('Got shared data from url', ['url' => $shared['link'], 'callstack' => System::callstack()]);
2974                 } else {
2975                         Logger::info('Got shared data from guid', ['guid' => $shared['guid'], 'callstack' => System::callstack()]);
2976                 }
2977
2978                 if (!empty($shared_item['title'])) {
2979                         $body = '[h3]' . $shared_item['title'] . "[/h3]\n" . $shared_item['body'];
2980                         unset($shared_item['title']);
2981                 } else {
2982                         $body = $shared_item['body'];
2983                 }
2984
2985                 $item['body'] = preg_replace("/\[share ([^\[\]]*)\].*\[\/share\]/ism", '[share $1]' . $body . '[/share]', $item['body']);
2986                 unset($shared_item['body']);
2987
2988                 return array_merge($item, $shared_item);
2989         }
2990
2991         /**
2992          * Check a prospective item array against user-level permissions
2993          *
2994          * @param array $item Expected keys: uri, gravity, and
2995          *                    author-link if is author-id is set,
2996          *                    owner-link if is owner-id is set,
2997          *                    causer-link if is causer-id is set.
2998          * @param int   $user_id Local user ID
2999          * @return bool
3000          * @throws \Exception
3001          */
3002         protected static function isAllowedByUser(array $item, int $user_id)
3003         {
3004                 if (!empty($item['author-id']) && Contact\User::isBlocked($item['author-id'], $user_id)) {
3005                         Logger::notice('Author is blocked by user', ['author-link' => $item['author-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3006                         return false;
3007                 }
3008
3009                 if (!empty($item['owner-id']) && Contact\User::isBlocked($item['owner-id'], $user_id)) {
3010                         Logger::notice('Owner is blocked by user', ['owner-link' => $item['owner-link'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3011                         return false;
3012                 }
3013
3014                 // The causer is set during a thread completion, for example because of a reshare. It countains the responsible actor.
3015                 if (!empty($item['causer-id']) && Contact\User::isBlocked($item['causer-id'], $user_id)) {
3016                         Logger::notice('Causer is blocked by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3017                         return false;
3018                 }
3019
3020                 if (!empty($item['causer-id']) && ($item['gravity'] === GRAVITY_PARENT) && Contact\User::isIgnored($item['causer-id'], $user_id)) {
3021                         Logger::notice('Causer is ignored by user', ['causer-link' => $item['causer-link'] ?? $item['causer-id'], 'uid' => $user_id, 'item-uri' => $item['uri']]);
3022                         return false;
3023                 }
3024
3025                 return true;
3026         }
3027 }