src/Model/Item.php

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