src/Model/Item.php

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