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