src/Model/Item.php

   1 <?php
   2
   3 /**
   4  * @file src/Model/Item.php
   5  */
   6
   7 namespace Friendica\Model;
   8
   9 use Friendica\BaseObject;
  10 use Friendica\Content\Text;
  11 use Friendica\Core\Addon;
  12 use Friendica\Core\Config;
  13 use Friendica\Core\L10n;
  14 use Friendica\Core\PConfig;
  15 use Friendica\Core\System;
  16 use Friendica\Core\Worker;
  17 use Friendica\Database\DBM;
  18 use Friendica\Model\Contact;
  19 use Friendica\Model\Conversation;
  20 use Friendica\Model\Group;
  21 use Friendica\Model\Term;
  22 use Friendica\Object\Image;
  23 use Friendica\Protocol\Diaspora;
  24 use Friendica\Protocol\OStatus;
  25 use Friendica\Util\DateTimeFormat;
  26 use Friendica\Util\XML;
  27 use dba;
  28 use Text_LanguageDetect;
  29
  30 require_once 'boot.php';
  31 require_once 'include/items.php';
  32 require_once 'include/text.php';
  33
  34 class Item extends BaseObject
  35 {
  36         /**
  37          * @brief Update existing item entries
  38          *
  39          * @param array $fields The fields that are to be changed
  40          * @param array $condition The condition for finding the item entries
  41          *
  42          * In the future we may have to change permissions as well.
  43          * Then we had to add the user id as third parameter.
  44          *
  45          * A return value of "0" doesn't mean an error - but that 0 rows had been changed.
  46          *
  47          * @return integer|boolean number of affected rows - or "false" if there was an error
  48          */
  49         public static function update(array $fields, array $condition)
  50         {
  51                 if (empty($condition) || empty($fields)) {
  52                         return false;
  53                 }
  54
  55                 // To ensure the data integrity we do it in an transaction
  56                 dba::transaction();
  57
  58                 // We cannot simply expand the condition to check for origin entries
  59                 // The condition needn't to be a simple array but could be a complex condition.
  60                 // And we have to execute this query before the update to ensure to fetch the same data.
  61                 $items = dba::select('item', ['id', 'origin'], $condition);
  62
  63                 $success = dba::update('item', $fields, $condition);
  64
  65                 if (!$success) {
  66                         dba::close($items);
  67                         dba::rollback();
  68                         return false;
  69                 }
  70
  71                 $rows = dba::affected_rows();
  72
  73                 while ($item = dba::fetch($items)) {
  74                         Term::insertFromTagFieldByItemId($item['id']);
  75                         Term::insertFromFileFieldByItemId($item['id']);
  76                         self::updateThread($item['id']);
  77
  78                         // We only need to notfiy others when it is an original entry from us.
  79                         // Only call the notifier when the item has some content relevant change.
  80                         if ($item['origin'] && in_array('edited', array_keys($fields))) {
  81                                 Worker::add(PRIORITY_HIGH, "Notifier", 'edit_post', $item['id']);
  82                         }
  83                 }
  84
  85                 dba::close($items);
  86                 dba::commit();
  87                 return $rows;
  88         }
  89
  90         /**
  91          * @brief Delete an item and notify others about it - if it was ours
  92          *
  93          * @param array $condition The condition for finding the item entries
  94          * @param integer $priority Priority for the notification
  95          * @param integer $uid User who wants to delete the item
  96          */
  97         public static function delete($condition, $priority = PRIORITY_HIGH, $uid = 0)
  98         {
  99                 $items = dba::select('item', ['id'], $condition);
 100                 while ($item = dba::fetch($items)) {
 101                         self::deleteById($item['id'], $priority, $uid);
 102                 }
 103                 dba::close($items);
 104         }
 105
 106         /**
 107          * @brief Delete an item and notify others about it - if it was ours
 108          *
 109          * @param integer $item_id Item ID that should be delete
 110          * @param integer $priority Priority for the notification
 111          * @param integer $uid User who wants to delete the item
 112          *
 113          * @return boolean success
 114          */
 115         public static function deleteById($item_id, $priority = PRIORITY_HIGH, $uid = 0)
 116         {
 117                 // locate item to be deleted
 118                 $fields = ['id', 'uri', 'uid', 'parent', 'parent-uri', 'origin',
 119                         'deleted', 'file', 'resource-id', 'event-id', 'attach',
 120                         'verb', 'object-type', 'object', 'target', 'contact-id'];
 121                 $item = dba::selectFirst('item', $fields, ['id' => $item_id]);
 122                 if (!DBM::is_result($item)) {
 123                         logger('Item with ID ' . $item_id . " hasn't been found.", LOGGER_DEBUG);
 124                         return false;
 125                 }
 126
 127                 if ($item['deleted']) {
 128                         logger('Item with ID ' . $item_id . ' has already been deleted.', LOGGER_DEBUG);
 129                         return false;
 130                 }
 131
 132                 $parent = dba::selectFirst('item', ['origin'], ['id' => $item['parent']]);
 133                 if (!DBM::is_result($parent)) {
 134                         $parent = ['origin' => false];
 135                 }
 136
 137                 // "Deleting" global items just means hiding them
 138                 if (($item['uid'] == 0) && ($uid != 0)) {
 139                         dba::update('user-item', ['hidden' => true], ['iid' => $item_id, 'uid' => $uid], true);
 140                         return true;
 141                 }
 142
 143                 // clean up categories and tags so they don't end up as orphans
 144
 145                 $matches = false;
 146                 $cnt = preg_match_all('/<(.*?)>/', $item['file'], $matches, PREG_SET_ORDER);
 147                 if ($cnt) {
 148                         foreach ($matches as $mtch) {
 149                                 file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],true);
 150                         }
 151                 }
 152
 153                 $matches = false;
 154
 155                 $cnt = preg_match_all('/\[(.*?)\]/', $item['file'], $matches, PREG_SET_ORDER);
 156                 if ($cnt) {
 157                         foreach ($matches as $mtch) {
 158                                 file_tag_unsave_file($item['uid'], $item['id'], $mtch[1],false);
 159                         }
 160                 }
 161
 162                 /*
 163                  * If item is a link to a photo resource, nuke all the associated photos
 164                  * (visitors will not have photo resources)
 165                  * This only applies to photos uploaded from the photos page. Photos inserted into a post do not
 166                  * generate a resource-id and therefore aren't intimately linked to the item.
 167                  */
 168                 if (strlen($item['resource-id'])) {
 169                         dba::delete('photo', ['resource-id' => $item['resource-id'], 'uid' => $item['uid']]);
 170                 }
 171
 172                 // If item is a link to an event, delete the event.
 173                 if (intval($item['event-id'])) {
 174                         Event::delete($item['event-id']);
 175                 }
 176
 177                 // If item has attachments, drop them
 178                 foreach (explode(", ", $item['attach']) as $attach) {
 179                         preg_match("|attach/(\d+)|", $attach, $matches);
 180                         dba::delete('attach', ['id' => $matches[1], 'uid' => $item['uid']]);
 181                 }
 182
 183                 // Delete tags that had been attached to other items
 184                 self::deleteTagsFromItem($item);
 185
 186                 // Set the item to "deleted"
 187                 dba::update('item', ['deleted' => true, 'title' => '', 'body' => '',
 188                                         'edited' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()],
 189                                 ['id' => $item['id']]);
 190
 191                 Term::insertFromTagFieldByItemId($item['id']);
 192                 Term::insertFromFileFieldByItemId($item['id']);
 193                 self::deleteThread($item['id'], $item['parent-uri']);
 194
 195                 if (!dba::exists('item', ["`uri` = ? AND `uid` != 0 AND NOT `deleted`", $item['uri']])) {
 196                         self::delete(['uri' => $item['uri'], 'uid' => 0, 'deleted' => false], $priority);
 197                 }
 198
 199                 // If it's the parent of a comment thread, kill all the kids
 200                 if ($item['id'] == $item['parent']) {
 201                         self::delete(['parent' => $item['parent'], 'deleted' => false], $priority);
 202                 }
 203
 204                 // Is it our comment and/or our thread?
 205                 if ($item['origin'] || $parent['origin']) {
 206
 207                         // When we delete the original post we will delete all existing copies on the server as well
 208                         self::delete(['uri' => $item['uri'], 'deleted' => false], $priority);
 209
 210                         // send the notification upstream/downstream
 211                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", "drop", intval($item['id']));
 212                 } elseif ($item['uid'] != 0) {
 213
 214                         // When we delete just our local user copy of an item, we have to set a marker to hide it
 215                         $global_item = dba::selectFirst('item', ['id'], ['uri' => $item['uri'], 'uid' => 0, 'deleted' => false]);
 216                         if (DBM::is_result($global_item)) {
 217                                 dba::update('user-item', ['hidden' => true], ['iid' => $global_item['id'], 'uid' => $item['uid']], true);
 218                         }
 219                 }
 220
 221                 logger('Item with ID ' . $item_id . " has been deleted.", LOGGER_DEBUG);
 222
 223                 return true;
 224         }
 225
 226         private static function deleteTagsFromItem($item)
 227         {
 228                 if (($item["verb"] != ACTIVITY_TAG) || ($item["object-type"] != ACTIVITY_OBJ_TAGTERM)) {
 229                         return;
 230                 }
 231
 232                 $xo = XML::parseString($item["object"], false);
 233                 $xt = XML::parseString($item["target"], false);
 234
 235                 if ($xt->type != ACTIVITY_OBJ_NOTE) {
 236                         return;
 237                 }
 238
 239                 $i = dba::selectFirst('item', ['id', 'contact-id', 'tag'], ['uri' => $xt->id, 'uid' => $item['uid']]);
 240                 if (!DBM::is_result($i)) {
 241                         return;
 242                 }
 243
 244                 // For tags, the owner cannot remove the tag on the author's copy of the post.
 245                 $owner_remove = ($item["contact-id"] == $i["contact-id"]);
 246                 $author_copy = $item["origin"];
 247
 248                 if (($owner_remove && $author_copy) || !$owner_remove) {
 249                         return;
 250                 }
 251
 252                 $tags = explode(',', $i["tag"]);
 253                 $newtags = [];
 254                 if (count($tags)) {
 255                         foreach ($tags as $tag) {
 256                                 if (trim($tag) !== trim($xo->body)) {
 257                                        $newtags[] = trim($tag);
 258                                 }
 259                         }
 260                 }
 261                 self::update(['tag' => implode(',', $newtags)], ['id' => $i["id"]]);
 262         }
 263
 264         private static function guid($item, $notify)
 265         {
 266                 $guid = notags(trim($item['guid']));
 267
 268                 if (!empty($guid)) {
 269                         return $guid;
 270                 }
 271
 272                 if ($notify) {
 273                         // We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
 274                         // We add the hash of our own host because our host is the original creator of the post.
 275                         $prefix_host = get_app()->get_hostname();
 276                 } else {
 277                         $prefix_host = '';
 278
 279                         // We are only storing the post so we create a GUID from the original hostname.
 280                         if (!empty($item['author-link'])) {
 281                                 $parsed = parse_url($item['author-link']);
 282                                 if (!empty($parsed['host'])) {
 283                                         $prefix_host = $parsed['host'];
 284                                 }
 285                         }
 286
 287                         if (empty($prefix_host) && !empty($item['plink'])) {
 288                                 $parsed = parse_url($item['plink']);
 289                                 if (!empty($parsed['host'])) {
 290                                         $prefix_host = $parsed['host'];
 291                                 }
 292                         }
 293
 294                         if (empty($prefix_host) && !empty($item['uri'])) {
 295                                 $parsed = parse_url($item['uri']);
 296                                 if (!empty($parsed['host'])) {
 297                                         $prefix_host = $parsed['host'];
 298                                 }
 299                         }
 300
 301                         // Is it in the format data@host.tld? - Used for mail contacts
 302                         if (empty($prefix_host) && !empty($item['author-link']) && strstr($item['author-link'], '@')) {
 303                                 $mailparts = explode('@', $item['author-link']);
 304                                 $prefix_host = array_pop($mailparts);
 305                         }
 306                 }
 307
 308                 if (!empty($item['plink'])) {
 309                         $guid = self::guidFromUri($item['plink'], $prefix_host);
 310                 } elseif (!empty($item['uri'])) {
 311                         $guid = self::guidFromUri($item['uri'], $prefix_host);
 312                 } else {
 313                         $guid = get_guid(32, hash('crc32', $prefix_host));
 314                 }
 315
 316                 return $guid;
 317         }
 318
 319         private static function contactId($item)
 320         {
 321                 $contact_id = (int)$item["contact-id"];
 322
 323                 if (!empty($contact_id)) {
 324                         return $contact_id;
 325                 }
 326                 logger('Missing contact-id. Called by: '.System::callstack(), LOGGER_DEBUG);
 327                 /*
 328                  * First we are looking for a suitable contact that matches with the author of the post
 329                  * This is done only for comments
 330                  */
 331                 if ($item['parent-uri'] != $item['uri']) {
 332                         $contact_id = Contact::getIdForURL($item['author-link'], $item['uid']);
 333                 }
 334
 335                 // If not present then maybe the owner was found
 336                 if ($contact_id == 0) {
 337                         $contact_id = Contact::getIdForURL($item['owner-link'], $item['uid']);
 338                 }
 339
 340                 // Still missing? Then use the "self" contact of the current user
 341                 if ($contact_id == 0) {
 342                         $self = dba::selectFirst('contact', ['id'], ['self' => true, 'uid' => $item['uid']]);
 343                         if (DBM::is_result($self)) {
 344                                 $contact_id = $self["id"];
 345                         }
 346                 }
 347                 logger("Contact-id was missing for post ".$item['guid']." from user id ".$item['uid']." - now set to ".$contact_id, LOGGER_DEBUG);
 348
 349                 return $contact_id;
 350         }
 351
 352         public static function insert($item, $force_parent = false, $notify = false, $dontcache = false)
 353         {
 354                 $a = get_app();
 355
 356                 // If it is a posting where users should get notifications, then define it as wall posting
 357                 if ($notify) {
 358                         $item['wall'] = 1;
 359                         $item['type'] = 'wall';
 360                         $item['origin'] = 1;
 361                         $item['network'] = NETWORK_DFRN;
 362                         $item['protocol'] = PROTOCOL_DFRN;
 363
 364                         if (is_int($notify)) {
 365                                 $priority = $notify;
 366                         } else {
 367                                 $priority = PRIORITY_HIGH;
 368                         }
 369                 } else {
 370                         $item['network'] = trim(defaults($item, 'network', NETWORK_PHANTOM));
 371                 }
 372
 373                 $item['guid'] = self::guid($item, $notify);
 374                 $item['uri'] = notags(trim(defaults($item, 'uri', item_new_uri($a->get_hostname(), $item['uid'], $item['guid']))));
 375
 376                 // Store conversation data
 377                 $item = Conversation::insert($item);
 378
 379                 /*
 380                  * If a Diaspora signature structure was passed in, pull it out of the
 381                  * item array and set it aside for later storage.
 382                  */
 383
 384                 $dsprsig = null;
 385                 if (x($item, 'dsprsig')) {
 386                         $encoded_signature = $item['dsprsig'];
 387                         $dsprsig = json_decode(base64_decode($item['dsprsig']));
 388                         unset($item['dsprsig']);
 389                 }
 390
 391                 if (!empty($item['diaspora_signed_text'])) {
 392                         $diaspora_signed_text = $item['diaspora_signed_text'];
 393                         unset($item['diaspora_signed_text']);
 394                 } else {
 395                         $diaspora_signed_text = '';
 396                 }
 397
 398                 // Converting the plink
 399                 /// @TODO Check if this is really still needed
 400                 if ($item['network'] == NETWORK_OSTATUS) {
 401                         if (isset($item['plink'])) {
 402                                 $item['plink'] = OStatus::convertHref($item['plink']);
 403                         } elseif (isset($item['uri'])) {
 404                                 $item['plink'] = OStatus::convertHref($item['uri']);
 405                         }
 406                 }
 407
 408                 if (!empty($item['thr-parent'])) {
 409                         $item['parent-uri'] = $item['thr-parent'];
 410                 }
 411
 412                 if (x($item, 'gravity')) {
 413                         $item['gravity'] = intval($item['gravity']);
 414                 } elseif ($item['parent-uri'] === $item['uri']) {
 415                         $item['gravity'] = 0;
 416                 } elseif (activity_match($item['verb'],ACTIVITY_POST)) {
 417                         $item['gravity'] = 6;
 418                 } else {
 419                         $item['gravity'] = 6;   // extensible catchall
 420                 }
 421
 422                 $item['type'] = defaults($item, 'type', 'remote');
 423
 424                 $uid = intval($item['uid']);
 425
 426                 // check for create date and expire time
 427                 $expire_interval = Config::get('system', 'dbclean-expire-days', 0);
 428
 429                 $user = dba::selectFirst('user', ['expire'], ['uid' => $uid]);
 430                 if (DBM::is_result($user) && ($user['expire'] > 0) && (($user['expire'] < $expire_interval) || ($expire_interval == 0))) {
 431                         $expire_interval = $user['expire'];
 432                 }
 433
 434                 if (($expire_interval > 0) && !empty($item['created'])) {
 435                         $expire_date = time() - ($expire_interval * 86400);
 436                         $created_date = strtotime($item['created']);
 437                         if ($created_date < $expire_date) {
 438                                 logger('item-store: item created ('.date('c', $created_date).') before expiration time ('.date('c', $expire_date).'). ignored. ' . print_r($item,true), LOGGER_DEBUG);
 439                                 return 0;
 440                         }
 441                 }
 442
 443                 /*
 444                  * Do we already have this item?
 445                  * We have to check several networks since Friendica posts could be repeated
 446                  * via OStatus (maybe Diasporsa as well)
 447                  */
 448                 if (in_array($item['network'], [NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS, ""])) {
 449                         $condition = ["`uri` = ? AND `uid` = ? AND `network` IN (?, ?, ?)",
 450                                 trim($item['uri']), $item['uid'],
 451                                 NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS];
 452                         $existing = dba::selectFirst('item', ['id', 'network'], $condition);
 453                         if (DBM::is_result($existing)) {
 454                                 // We only log the entries with a different user id than 0. Otherwise we would have too many false positives
 455                                 if ($uid != 0) {
 456                                         logger("Item with uri ".$item['uri']." already existed for user ".$uid." with id ".$existing["id"]." target network ".$existing["network"]." - new network: ".$item['network']);
 457                                 }
 458
 459                                 return $existing["id"];
 460                         }
 461                 }
 462
 463                 self::addLanguageInPostopts($item);
 464
 465                 $item['wall']          = intval(defaults($item, 'wall', 0));
 466                 $item['extid']         = trim(defaults($item, 'extid', ''));
 467                 $item['author-name']   = trim(defaults($item, 'author-name', ''));
 468                 $item['author-link']   = trim(defaults($item, 'author-link', ''));
 469                 $item['author-avatar'] = trim(defaults($item, 'author-avatar', ''));
 470                 $item['owner-name']    = trim(defaults($item, 'owner-name', ''));
 471                 $item['owner-link']    = trim(defaults($item, 'owner-link', ''));
 472                 $item['owner-avatar']  = trim(defaults($item, 'owner-avatar', ''));
 473                 $item['received']      = ((x($item, 'received') !== false) ? DateTimeFormat::utc($item['received']) : DateTimeFormat::utcNow());
 474                 $item['created']       = ((x($item, 'created') !== false) ? DateTimeFormat::utc($item['created']) : $item['received']);
 475                 $item['edited']        = ((x($item, 'edited') !== false) ? DateTimeFormat::utc($item['edited']) : $item['created']);
 476                 $item['changed']       = ((x($item, 'changed') !== false) ? DateTimeFormat::utc($item['changed']) : $item['created']);
 477                 $item['commented']     = ((x($item, 'commented') !== false) ? DateTimeFormat::utc($item['commented']) : $item['created']);
 478                 $item['title']         = trim(defaults($item, 'title', ''));
 479                 $item['location']      = trim(defaults($item, 'location', ''));
 480                 $item['coord']         = trim(defaults($item, 'coord', ''));
 481                 $item['visible']       = ((x($item, 'visible') !== false) ? intval($item['visible'])         : 1);
 482                 $item['deleted']       = 0;
 483                 $item['parent-uri']    = trim(defaults($item, 'parent-uri', $item['uri']));
 484                 $item['verb']          = trim(defaults($item, 'verb', ''));
 485                 $item['object-type']   = trim(defaults($item, 'object-type', ''));
 486                 $item['object']        = trim(defaults($item, 'object', ''));
 487                 $item['target-type']   = trim(defaults($item, 'target-type', ''));
 488                 $item['target']        = trim(defaults($item, 'target', ''));
 489                 $item['plink']         = trim(defaults($item, 'plink', ''));
 490                 $item['allow_cid']     = trim(defaults($item, 'allow_cid', ''));
 491                 $item['allow_gid']     = trim(defaults($item, 'allow_gid', ''));
 492                 $item['deny_cid']      = trim(defaults($item, 'deny_cid', ''));
 493                 $item['deny_gid']      = trim(defaults($item, 'deny_gid', ''));
 494                 $item['private']       = intval(defaults($item, 'private', 0));
 495                 $item['bookmark']      = intval(defaults($item, 'bookmark', 0));
 496                 $item['body']          = trim(defaults($item, 'body', ''));
 497                 $item['tag']           = trim(defaults($item, 'tag', ''));
 498                 $item['attach']        = trim(defaults($item, 'attach', ''));
 499                 $item['app']           = trim(defaults($item, 'app', ''));
 500                 $item['origin']        = intval(defaults($item, 'origin', 0));
 501                 $item['postopts']      = trim(defaults($item, 'postopts', ''));
 502                 $item['resource-id']   = trim(defaults($item, 'resource-id', ''));
 503                 $item['event-id']      = intval(defaults($item, 'event-id', 0));
 504                 $item['inform']        = trim(defaults($item, 'inform', ''));
 505                 $item['file']          = trim(defaults($item, 'file', ''));
 506
 507                 // When there is no content then we don't post it
 508                 if ($item['body'].$item['title'] == '') {
 509                         return 0;
 510                 }
 511
 512                 // Items cannot be stored before they happen ...
 513                 if ($item['created'] > DateTimeFormat::utcNow()) {
 514                         $item['created'] = DateTimeFormat::utcNow();
 515                 }
 516
 517                 // We haven't invented time travel by now.
 518                 if ($item['edited'] > DateTimeFormat::utcNow()) {
 519                         $item['edited'] = DateTimeFormat::utcNow();
 520                 }
 521
 522                 if (($item['author-link'] == "") && ($item['owner-link'] == "")) {
 523                         logger("Both author-link and owner-link are empty. Called by: " . System::callstack(), LOGGER_DEBUG);
 524                 }
 525
 526                 $item['plink'] = defaults($item, 'plink', System::baseUrl() . '/display/' . urlencode($item['guid']));
 527
 528                 // The contact-id should be set before "self::insert" was called - but there seems to be issues sometimes
 529                 $item["contact-id"] = self::contactId($item);
 530
 531                 $default = ['url' => $item['author-link'], 'name' => $item['author-name'],
 532                         'photo' => $item['author-avatar'], 'network' => $item['network']];
 533
 534                 $item['author-id'] = defaults($item, 'author-id', Contact::getIdForURL($item["author-link"], 0, false, $default));
 535
 536                 if (Contact::isBlocked($item["author-id"])) {
 537                         logger('Contact '.$item["author-id"].' is blocked, item '.$item["uri"].' will not be stored');
 538                         return 0;
 539                 }
 540
 541                 $default = ['url' => $item['owner-link'], 'name' => $item['owner-name'],
 542                         'photo' => $item['owner-avatar'], 'network' => $item['network']];
 543
 544                 $item['owner-id'] = defaults($item, 'owner-id', Contact::getIdForURL($item["owner-link"], 0, false, $default));
 545
 546                 if (Contact::isBlocked($item["owner-id"])) {
 547                         logger('Contact '.$item["owner-id"].' is blocked, item '.$item["uri"].' will not be stored');
 548                         return 0;
 549                 }
 550
 551                 if ($item['network'] == NETWORK_PHANTOM) {
 552                         logger('Missing network. Called by: '.System::callstack(), LOGGER_DEBUG);
 553
 554                         $contact = Contact::getDetailsByURL($item['author-link'], $item['uid']);
 555                         if (!empty($contact['network'])) {
 556                                 $item['network'] = $contact["network"];
 557                         } else {
 558                                 $item['network'] = NETWORK_DFRN;
 559                         }
 560                         logger("Set network to " . $item["network"] . " for " . $item["uri"], LOGGER_DEBUG);
 561                 }
 562
 563                 // Checking if there is already an item with the same guid
 564                 logger('Checking for an item for user '.$item['uid'].' on network '.$item['network'].' with the guid '.$item['guid'], LOGGER_DEBUG);
 565                 $condition = ['guid' => $item['guid'], 'network' => $item['network'], 'uid' => $item['uid']];
 566                 if (dba::exists('item', $condition)) {
 567                         logger('found item with guid '.$item['guid'].' for user '.$item['uid'].' on network '.$item['network'], LOGGER_DEBUG);
 568                         return 0;
 569                 }
 570
 571                 // Check for hashtags in the body and repair or add hashtag links
 572                 self::setHashtags($item);
 573
 574                 $item['thr-parent'] = $item['parent-uri'];
 575
 576                 $notify_type = '';
 577                 $allow_cid = '';
 578                 $allow_gid = '';
 579                 $deny_cid  = '';
 580                 $deny_gid  = '';
 581
 582                 if ($item['parent-uri'] === $item['uri']) {
 583                         $parent_id = 0;
 584                         $parent_deleted = 0;
 585                         $allow_cid = $item['allow_cid'];
 586                         $allow_gid = $item['allow_gid'];
 587                         $deny_cid  = $item['deny_cid'];
 588                         $deny_gid  = $item['deny_gid'];
 589                         $notify_type = 'wall-new';
 590                 } else {
 591                         // find the parent and snarf the item id and ACLs
 592                         // and anything else we need to inherit
 593
 594                         $fields = ['uri', 'parent-uri', 'id', 'deleted',
 595                                 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
 596                                 'wall', 'private', 'forum_mode', 'origin'];
 597                         $condition = ['uri' => $item['parent-uri'], 'uid' => $item['uid']];
 598                         $params = ['order' => ['id' => false]];
 599                         $parent = dba::selectFirst('item', $fields, $condition, $params);
 600
 601                         if (DBM::is_result($parent)) {
 602                                 // is the new message multi-level threaded?
 603                                 // even though we don't support it now, preserve the info
 604                                 // and re-attach to the conversation parent.
 605
 606                                 if ($parent['uri'] != $parent['parent-uri']) {
 607                                         $item['parent-uri'] = $parent['parent-uri'];
 608
 609                                         $condition = ['uri' => $item['parent-uri'],
 610                                                 'parent-uri' => $item['parent-uri'],
 611                                                 'uid' => $item['uid']];
 612                                         $params = ['order' => ['id' => false]];
 613                                         $toplevel_parent = dba::selectFirst('item', $fields, $condition, $params);
 614
 615                                         if (DBM::is_result($toplevel_parent)) {
 616                                                 $parent = $toplevel_parent;
 617                                         }
 618                                 }
 619
 620                                 $parent_id      = $parent['id'];
 621                                 $parent_deleted = $parent['deleted'];
 622                                 $allow_cid      = $parent['allow_cid'];
 623                                 $allow_gid      = $parent['allow_gid'];
 624                                 $deny_cid       = $parent['deny_cid'];
 625                                 $deny_gid       = $parent['deny_gid'];
 626                                 $item['wall']    = $parent['wall'];
 627                                 $notify_type    = 'comment-new';
 628
 629                                 /*
 630                                  * If the parent is private, force privacy for the entire conversation
 631                                  * This differs from the above settings as it subtly allows comments from
 632                                  * email correspondents to be private even if the overall thread is not.
 633                                  */
 634                                 if ($parent['private']) {
 635                                         $item['private'] = $parent['private'];
 636                                 }
 637
 638                                 /*
 639                                  * Edge case. We host a public forum that was originally posted to privately.
 640                                  * The original author commented, but as this is a comment, the permissions
 641                                  * weren't fixed up so it will still show the comment as private unless we fix it here.
 642                                  */
 643                                 if ((intval($parent['forum_mode']) == 1) && $parent['private']) {
 644                                         $item['private'] = 0;
 645                                 }
 646
 647                                 // If its a post from myself then tag the thread as "mention"
 648                                 logger("Checking if parent ".$parent_id." has to be tagged as mention for user ".$item['uid'], LOGGER_DEBUG);
 649                                 $user = dba::selectFirst('user', ['nickname'], ['uid' => $item['uid']]);
 650                                 if (DBM::is_result($user)) {
 651                                         $self = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
 652                                         logger("'myself' is ".$self." for parent ".$parent_id." checking against ".$item['author-link']." and ".$item['owner-link'], LOGGER_DEBUG);
 653                                         if ((normalise_link($item['author-link']) == $self) || (normalise_link($item['owner-link']) == $self)) {
 654                                                 dba::update('thread', ['mention' => true], ['iid' => $parent_id]);
 655                                                 logger("tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
 656                                         }
 657                                 }
 658                         } else {
 659                                 /*
 660                                  * Allow one to see reply tweets from status.net even when
 661                                  * we don't have or can't see the original post.
 662                                  */
 663                                 if ($force_parent) {
 664                                         logger('$force_parent=true, reply converted to top-level post.');
 665                                         $parent_id = 0;
 666                                         $item['parent-uri'] = $item['uri'];
 667                                         $item['gravity'] = 0;
 668                                 } else {
 669                                         logger('item parent '.$item['parent-uri'].' for '.$item['uid'].' was not found - ignoring item');
 670                                         return 0;
 671                                 }
 672
 673                                 $parent_deleted = 0;
 674                         }
 675                 }
 676
 677                 $condition = ["`uri` = ? AND `network` IN (?, ?) AND `uid` = ?",
 678                         $item['uri'], $item['network'], NETWORK_DFRN, $item['uid']];
 679                 if (dba::exists('item', $condition)) {
 680                         logger('duplicated item with the same uri found. '.print_r($item,true));
 681                         return 0;
 682                 }
 683
 684                 // On Friendica and Diaspora the GUID is unique
 685                 if (in_array($item['network'], [NETWORK_DFRN, NETWORK_DIASPORA])) {
 686                         $condition = ['guid' => $item['guid'], 'uid' => $item['uid']];
 687                         if (dba::exists('item', $condition)) {
 688                                 logger('duplicated item with the same guid found. '.print_r($item,true));
 689                                 return 0;
 690                         }
 691                 } else {
 692                         // Check for an existing post with the same content. There seems to be a problem with OStatus.
 693                         $condition = ["`body` = ? AND `network` = ? AND `created` = ? AND `contact-id` = ? AND `uid` = ?",
 694                                         $item['body'], $item['network'], $item['created'], $item['contact-id'], $item['uid']];
 695                         if (dba::exists('item', $condition)) {
 696                                 logger('duplicated item with the same body found. '.print_r($item,true));
 697                                 return 0;
 698                         }
 699                 }
 700
 701                 // Is this item available in the global items (with uid=0)?
 702                 if ($item["uid"] == 0) {
 703                         $item["global"] = true;
 704
 705                         // Set the global flag on all items if this was a global item entry
 706                         dba::update('item', ['global' => true], ['uri' => $item["uri"]]);
 707                 } else {
 708                         $item["global"] = dba::exists('item', ['uid' => 0, 'uri' => $item["uri"]]);
 709                 }
 710
 711                 // ACL settings
 712                 if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid)) {
 713                         $private = 1;
 714                 } else {
 715                         $private = $item['private'];
 716                 }
 717
 718                 $item["allow_cid"] = $allow_cid;
 719                 $item["allow_gid"] = $allow_gid;
 720                 $item["deny_cid"] = $deny_cid;
 721                 $item["deny_gid"] = $deny_gid;
 722                 $item["private"] = $private;
 723                 $item["deleted"] = $parent_deleted;
 724
 725                 // Fill the cache field
 726                 put_item_in_cache($item);
 727
 728                 if ($notify) {
 729                         Addon::callHooks('post_local', $item);
 730                 } else {
 731                         Addon::callHooks('post_remote', $item);
 732                 }
 733
 734                 // This array field is used to trigger some automatic reactions
 735                 // It is mainly used in the "post_local" hook.
 736                 unset($item['api_source']);
 737
 738                 if (x($item, 'cancel')) {
 739                         logger('post cancelled by addon.');
 740                         return 0;
 741                 }
 742
 743                 /*
 744                  * Check for already added items.
 745                  * There is a timing issue here that sometimes creates double postings.
 746                  * An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
 747                  */
 748                 if ($item["uid"] == 0) {
 749                         if (dba::exists('item', ['uri' => trim($item['uri']), 'uid' => 0])) {
 750                                 logger('Global item already stored. URI: '.$item['uri'].' on network '.$item['network'], LOGGER_DEBUG);
 751                                 return 0;
 752                         }
 753                 }
 754
 755                 logger('' . print_r($item,true), LOGGER_DATA);
 756
 757                 dba::transaction();
 758                 $ret = dba::insert('item', $item);
 759
 760                 // When the item was successfully stored we fetch the ID of the item.
 761                 if (DBM::is_result($ret)) {
 762                         $current_post = dba::lastInsertId();
 763                 } else {
 764                         // This can happen - for example - if there are locking timeouts.
 765                         dba::rollback();
 766
 767                         // Store the data into a spool file so that we can try again later.
 768
 769                         // At first we restore the Diaspora signature that we removed above.
 770                         if (isset($encoded_signature)) {
 771                                 $item['dsprsig'] = $encoded_signature;
 772                         }
 773
 774                         // Now we store the data in the spool directory
 775                         // We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
 776                         $file = 'item-'.round(microtime(true) * 10000).'-'.mt_rand().'.msg';
 777
 778                         $spoolpath = get_spoolpath();
 779                         if ($spoolpath != "") {
 780                                 $spool = $spoolpath.'/'.$file;
 781                                 file_put_contents($spool, json_encode($item));
 782                                 logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
 783                         }
 784                         return 0;
 785                 }
 786
 787                 if ($current_post == 0) {
 788                         // This is one of these error messages that never should occur.
 789                         logger("couldn't find created item - we better quit now.");
 790                         dba::rollback();
 791                         return 0;
 792                 }
 793
 794                 // How much entries have we created?
 795                 // We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
 796                 $entries = dba::count('item', ['uri' => $item['uri'], 'uid' => $item['uid'], 'network' => $item['network']]);
 797
 798                 if ($entries > 1) {
 799                         // There are duplicates. We delete our just created entry.
 800                         logger('Duplicated post occurred. uri = ' . $item['uri'] . ' uid = ' . $item['uid']);
 801
 802                         // Yes, we could do a rollback here - but we are having many users with MyISAM.
 803                         dba::delete('item', ['id' => $current_post]);
 804                         dba::commit();
 805                         return 0;
 806                 } elseif ($entries == 0) {
 807                         // This really should never happen since we quit earlier if there were problems.
 808                         logger("Something is terribly wrong. We haven't found our created entry.");
 809                         dba::rollback();
 810                         return 0;
 811                 }
 812
 813                 logger('created item '.$current_post);
 814                 self::updateContact($item);
 815
 816                 if (!$parent_id || ($item['parent-uri'] === $item['uri'])) {
 817                         $parent_id = $current_post;
 818                 }
 819
 820                 // Set parent id
 821                 dba::update('item', ['parent' => $parent_id], ['id' => $current_post]);
 822
 823                 $item['id'] = $current_post;
 824                 $item['parent'] = $parent_id;
 825
 826                 // update the commented timestamp on the parent
 827                 // Only update "commented" if it is really a comment
 828                 if (($item['verb'] == ACTIVITY_POST) || !Config::get("system", "like_no_comment")) {
 829                         dba::update('item', ['commented' => DateTimeFormat::utcNow(), 'changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
 830                 } else {
 831                         dba::update('item', ['changed' => DateTimeFormat::utcNow()], ['id' => $parent_id]);
 832                 }
 833
 834                 if ($dsprsig) {
 835                         /*
 836                          * Friendica servers lower than 3.4.3-2 had double encoded the signature ...
 837                          * We can check for this condition when we decode and encode the stuff again.
 838                          */
 839                         if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
 840                                 $dsprsig->signature = base64_decode($dsprsig->signature);
 841                                 logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
 842                         }
 843
 844                         dba::insert('sign', ['iid' => $current_post, 'signed_text' => $dsprsig->signed_text,
 845                                                 'signature' => $dsprsig->signature, 'signer' => $dsprsig->signer]);
 846                 }
 847
 848                 if (!empty($diaspora_signed_text)) {
 849                         // Formerly we stored the signed text, the signature and the author in different fields.
 850                         // We now store the raw data so that we are more flexible.
 851                         dba::insert('sign', ['iid' => $current_post, 'signed_text' => $diaspora_signed_text]);
 852                 }
 853
 854                 $deleted = self::tagDeliver($item['uid'], $current_post);
 855
 856                 /*
 857                  * current post can be deleted if is for a community page and no mention are
 858                  * in it.
 859                  */
 860                 if (!$deleted && !$dontcache) {
 861                         $posted_item = dba::selectFirst('item', [], ['id' => $current_post]);
 862                         if (DBM::is_result($posted_item)) {
 863                                 if ($notify) {
 864                                         Addon::callHooks('post_local_end', $posted_item);
 865                                 } else {
 866                                         Addon::callHooks('post_remote_end', $posted_item);
 867                                 }
 868                         } else {
 869                                 logger('new item not found in DB, id ' . $current_post);
 870                         }
 871                 }
 872
 873                 if ($item['parent-uri'] === $item['uri']) {
 874                         self::addThread($current_post);
 875                 } else {
 876                         self::updateThread($parent_id);
 877                 }
 878
 879                 dba::commit();
 880
 881                 /*
 882                  * Due to deadlock issues with the "term" table we are doing these steps after the commit.
 883                  * This is not perfect - but a workable solution until we found the reason for the problem.
 884                  */
 885                 Term::insertFromTagFieldByItemId($current_post);
 886                 Term::insertFromFileFieldByItemId($current_post);
 887
 888                 if ($item['parent-uri'] === $item['uri']) {
 889                         self::addShadow($current_post);
 890                 } else {
 891                         self::addShadowPost($current_post);
 892                 }
 893
 894                 check_user_notification($current_post);
 895
 896                 if ($notify) {
 897                         Worker::add(['priority' => $priority, 'dont_fork' => true], "Notifier", $notify_type, $current_post);
 898                 } elseif (!empty($parent) && $parent['origin']) {
 899                         Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], "Notifier", "comment-import", $current_post);
 900                 }
 901
 902                 return $current_post;
 903         }
 904
 905         /**
 906          * @brief Distributes public items to the receivers
 907          *
 908          * @param integer $itemid      Item ID that should be added
 909          * @param string  $signed_text Original text (for Diaspora signatures), JSON encoded.
 910          */
 911         public static function distribute($itemid, $signed_text = '')
 912         {
 913                 $condition = ["`id` IN (SELECT `parent` FROM `item` WHERE `id` = ?)", $itemid];
 914                 $parent = dba::selectFirst('item', ['owner-id'], $condition);
 915                 if (!DBM::is_result($parent)) {
 916                         return;
 917                 }
 918
 919                 // Only distribute public items from native networks
 920                 $condition = ['id' => $itemid, 'uid' => 0,
 921                         'network' => [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""],
 922                         'visible' => true, 'deleted' => false, 'moderated' => false, 'private' => false];
 923                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
 924                 if (!DBM::is_result($item)) {
 925                         return;
 926                 }
 927
 928                 unset($item['id']);
 929                 unset($item['parent']);
 930                 unset($item['mention']);
 931                 unset($item['wall']);
 932                 unset($item['origin']);
 933                 unset($item['starred']);
 934                 unset($item['rendered-hash']);
 935                 unset($item['rendered-html']);
 936
 937                 $users = [];
 938
 939                 $condition = ["`nurl` IN (SELECT `nurl` FROM `contact` WHERE `id` = ?) AND `uid` != 0 AND NOT `blocked` AND `rel` IN (?, ?)",
 940                         $parent['owner-id'], CONTACT_IS_SHARING,  CONTACT_IS_FRIEND];
 941                 $contacts = dba::select('contact', ['uid'], $condition);
 942                 while ($contact = dba::fetch($contacts)) {
 943                         $users[$contact['uid']] = $contact['uid'];
 944                 }
 945
 946                 $origin_uid = 0;
 947
 948                 if ($item['uri'] != $item['parent-uri']) {
 949                         $parents = dba::select('item', ['uid', 'origin'], ["`uri` = ? AND `uid` != 0", $item['parent-uri']]);
 950                         while ($parent = dba::fetch($parents)) {
 951                                 $users[$parent['uid']] = $parent['uid'];
 952                                 if ($parent['origin'] && !$item['origin']) {
 953                                         $origin_uid = $parent['uid'];
 954                                 }
 955                         }
 956                 }
 957
 958                 foreach ($users as $uid) {
 959                         if ($origin_uid == $uid) {
 960                                 $item['diaspora_signed_text'] = $signed_text;
 961                         }
 962                         self::storeForUser($itemid, $item, $uid);
 963                 }
 964         }
 965
 966         /**
 967          * @brief Store public items for the receivers
 968          *
 969          * @param integer $itemid Item ID that should be added
 970          * @param array   $item   The item entry that will be stored
 971          * @param integer $uid    The user that will receive the item entry
 972          */
 973         private static function storeForUser($itemid, $item, $uid)
 974         {
 975                 $item['uid'] = $uid;
 976                 $item['origin'] = 0;
 977                 $item['wall'] = 0;
 978                 if ($item['uri'] == $item['parent-uri']) {
 979                         $item['contact-id'] = Contact::getIdForURL($item['owner-link'], $uid);
 980                 } else {
 981                         $item['contact-id'] = Contact::getIdForURL($item['author-link'], $uid);
 982                 }
 983
 984                 if (empty($item['contact-id'])) {
 985                         $self = dba::selectFirst('contact', ['id'], ['self' => true, 'uid' => $uid]);
 986                         if (!DBM::is_result($self)) {
 987                                 return;
 988                         }
 989                         $item['contact-id'] = $self['id'];
 990                 }
 991
 992                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
 993                         $item['type'] = 'remote-comment';
 994                 } elseif ($item['type'] == 'wall') {
 995                         $item['type'] = 'remote';
 996                 }
 997
 998                 /// @todo Handling of "event-id"
 999
1000                 $notify = false;
1001                 if ($item['uri'] == $item['parent-uri']) {
1002                         $contact = dba::selectFirst('contact', [], ['id' => $item['contact-id'], 'self' => false]);
1003                         if (DBM::is_result($contact)) {
1004                                 $notify = self::isRemoteSelf($contact, $item);
1005                         }
1006                 }
1007
1008                 $distributed = self::insert($item, false, $notify, true);
1009
1010                 if (!$distributed) {
1011                         logger("Distributed public item " . $itemid . " for user " . $uid . " wasn't stored", LOGGER_DEBUG);
1012                 } else {
1013                         logger("Distributed public item " . $itemid . " for user " . $uid . " with id " . $distributed, LOGGER_DEBUG);
1014                 }
1015         }
1016
1017         /**
1018          * @brief Add a shadow entry for a given item id that is a thread starter
1019          *
1020          * We store every public item entry additionally with the user id "0".
1021          * This is used for the community page and for the search.
1022          * It is planned that in the future we will store public item entries only once.
1023          *
1024          * @param integer $itemid Item ID that should be added
1025          */
1026         public static function addShadow($itemid)
1027         {
1028                 $fields = ['uid', 'private', 'moderated', 'visible', 'deleted', 'network'];
1029                 $condition = ['id' => $itemid, 'parent' => [0, $itemid]];
1030                 $item = dba::selectFirst('item', $fields, $condition);
1031
1032                 if (!DBM::is_result($item)) {
1033                         return;
1034                 }
1035
1036                 // is it already a copy?
1037                 if (($itemid == 0) || ($item['uid'] == 0)) {
1038                         return;
1039                 }
1040
1041                 // Is it a visible public post?
1042                 if (!$item["visible"] || $item["deleted"] || $item["moderated"] || $item["private"]) {
1043                         return;
1044                 }
1045
1046                 // is it an entry from a connector? Only add an entry for natively connected networks
1047                 if (!in_array($item["network"], [NETWORK_DFRN, NETWORK_DIASPORA, NETWORK_OSTATUS, ""])) {
1048                         return;
1049                 }
1050
1051                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1052
1053                 if (DBM::is_result($item) && ($item["allow_cid"] == '') && ($item["allow_gid"] == '') &&
1054                         ($item["deny_cid"] == '') && ($item["deny_gid"] == '')) {
1055
1056                         if (!dba::exists('item', ['uri' => $item['uri'], 'uid' => 0])) {
1057                                 // Preparing public shadow (removing user specific data)
1058                                 $item['uid'] = 0;
1059                                 unset($item['id']);
1060                                 unset($item['parent']);
1061                                 unset($item['wall']);
1062                                 unset($item['mention']);
1063                                 unset($item['origin']);
1064                                 unset($item['starred']);
1065                                 unset($item['rendered-hash']);
1066                                 unset($item['rendered-html']);
1067                                 if ($item['uri'] == $item['parent-uri']) {
1068                                         $item['contact-id'] = Contact::getIdForURL($item['owner-link']);
1069                                 } else {
1070                                         $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1071                                 }
1072
1073                                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1074                                         $item['type'] = 'remote-comment';
1075                                 } elseif ($item['type'] == 'wall') {
1076                                         $item['type'] = 'remote';
1077                                 }
1078
1079                                 $public_shadow = self::insert($item, false, false, true);
1080
1081                                 logger("Stored public shadow for thread ".$itemid." under id ".$public_shadow, LOGGER_DEBUG);
1082                         }
1083                 }
1084         }
1085
1086         /**
1087          * @brief Add a shadow entry for a given item id that is a comment
1088          *
1089          * This function does the same like the function above - but for comments
1090          *
1091          * @param integer $itemid Item ID that should be added
1092          */
1093         public static function addShadowPost($itemid)
1094         {
1095                 $item = dba::selectFirst('item', [], ['id' => $itemid]);
1096                 if (!DBM::is_result($item)) {
1097                         return;
1098                 }
1099
1100                 // Is it a toplevel post?
1101                 if ($item['id'] == $item['parent']) {
1102                         self::addShadow($itemid);
1103                         return;
1104                 }
1105
1106                 // Is this a shadow entry?
1107                 if ($item['uid'] == 0)
1108                         return;
1109
1110                 // Is there a shadow parent?
1111                 if (!dba::exists('item', ['uri' => $item['parent-uri'], 'uid' => 0])) {
1112                         return;
1113                 }
1114
1115                 // Is there already a shadow entry?
1116                 if (dba::exists('item', ['uri' => $item['uri'], 'uid' => 0])) {
1117                         return;
1118                 }
1119
1120                 // Save "origin" and "parent" state
1121                 $origin = $item['origin'];
1122                 $parent = $item['parent'];
1123
1124                 // Preparing public shadow (removing user specific data)
1125                 $item['uid'] = 0;
1126                 unset($item['id']);
1127                 unset($item['parent']);
1128                 unset($item['wall']);
1129                 unset($item['mention']);
1130                 unset($item['origin']);
1131                 unset($item['starred']);
1132                 unset($item['rendered-hash']);
1133                 unset($item['rendered-html']);
1134                 $item['contact-id'] = Contact::getIdForURL($item['author-link']);
1135
1136                 if (in_array($item['type'], ["net-comment", "wall-comment"])) {
1137                         $item['type'] = 'remote-comment';
1138                 } elseif ($item['type'] == 'wall') {
1139                         $item['type'] = 'remote';
1140                 }
1141
1142                 $public_shadow = self::insert($item, false, false, true);
1143
1144                 logger("Stored public shadow for comment ".$item['uri']." under id ".$public_shadow, LOGGER_DEBUG);
1145
1146                 // If this was a comment to a Diaspora post we don't get our comment back.
1147                 // This means that we have to distribute the comment by ourselves.
1148                 if ($origin) {
1149                         if (dba::exists('item', ['id' => $parent, 'network' => NETWORK_DIASPORA])) {
1150                                 self::distribute($public_shadow);
1151                         }
1152                 }
1153         }
1154
1155          /**
1156          * Adds a "lang" specification in a "postopts" element of given $arr,
1157          * if possible and not already present.
1158          * Expects "body" element to exist in $arr.
1159          */
1160         private static function addLanguageInPostopts(&$item)
1161         {
1162                 if (!empty($item['postopts'])) {
1163                         if (strstr($item['postopts'], 'lang=')) {
1164                                 // do not override
1165                                 return;
1166                         }
1167                         $postopts = $item['postopts'];
1168                 } else {
1169                         $postopts = "";
1170                 }
1171
1172                 $naked_body = Text\BBCode::toPlaintext($item['body'], false);
1173
1174                 $languages = (new Text_LanguageDetect())->detect($naked_body, 3);
1175
1176                 if (sizeof($languages) > 0) {
1177                         if ($postopts != '') {
1178                                 $postopts .= '&'; // arbitrary separator, to be reviewed
1179                         }
1180
1181                         $postopts .= 'lang=';
1182                         $sep = "";
1183
1184                         foreach ($languages as $language => $score) {
1185                                 $postopts .= $sep . $language . ";" . $score;
1186                                 $sep = ':';
1187                         }
1188                         $item['postopts'] = $postopts;
1189                 }
1190         }
1191
1192         /**
1193          * @brief Creates an unique guid out of a given uri
1194          *
1195          * @param string $uri uri of an item entry
1196          * @param string $host hostname for the GUID prefix
1197          * @return string unique guid
1198          */
1199         public static function guidFromUri($uri, $host)
1200         {
1201                 // Our regular guid routine is using this kind of prefix as well
1202                 // We have to avoid that different routines could accidentally create the same value
1203                 $parsed = parse_url($uri);
1204
1205                 // We use a hash of the hostname as prefix for the guid
1206                 $guid_prefix = hash("crc32", $host);
1207
1208                 // Remove the scheme to make sure that "https" and "http" doesn't make a difference
1209                 unset($parsed["scheme"]);
1210
1211                 // Glue it together to be able to make a hash from it
1212                 $host_id = implode("/", $parsed);
1213
1214                 // We could use any hash algorithm since it isn't a security issue
1215                 $host_hash = hash("ripemd128", $host_id);
1216
1217                 return $guid_prefix.$host_hash;
1218         }
1219
1220         /**
1221          * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
1222          *
1223          * This can be used to filter for inactive contacts.
1224          * Only do this for public postings to avoid privacy problems, since poco data is public.
1225          * Don't set this value if it isn't from the owner (could be an author that we don't know)
1226          *
1227          * @param array $arr Contains the just posted item record
1228          */
1229         private static function updateContact($arr)
1230         {
1231                 // Unarchive the author
1232                 $contact = dba::selectFirst('contact', [], ['id' => $arr["author-id"]]);
1233                 if (DBM::is_result($contact)) {
1234                         Contact::unmarkForArchival($contact);
1235                 }
1236
1237                 // Unarchive the contact if it's not our own contact
1238                 $contact = dba::selectFirst('contact', [], ['id' => $arr["contact-id"], 'self' => false]);
1239                 if (DBM::is_result($contact)) {
1240                         Contact::unmarkForArchival($contact);
1241                 }
1242
1243                 $update = (!$arr['private'] && (($arr["author-link"] === $arr["owner-link"]) || ($arr["parent-uri"] === $arr["uri"])));
1244
1245                 // Is it a forum? Then we don't care about the rules from above
1246                 if (!$update && ($arr["network"] == NETWORK_DFRN) && ($arr["parent-uri"] === $arr["uri"])) {
1247                         if (dba::exists('contact', ['id' => $arr['contact-id'], 'forum' => true])) {
1248                                 $update = true;
1249                         }
1250                 }
1251
1252                 if ($update) {
1253                         dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1254                                 ['id' => $arr['contact-id']]);
1255                 }
1256                 // Now do the same for the system wide contacts with uid=0
1257                 if (!$arr['private']) {
1258                         dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1259                                 ['id' => $arr['owner-id']]);
1260
1261                         if ($arr['owner-id'] != $arr['author-id']) {
1262                                 dba::update('contact', ['success_update' => $arr['received'], 'last-item' => $arr['received']],
1263                                         ['id' => $arr['author-id']]);
1264                         }
1265                 }
1266         }
1267
1268         public static function setHashtags(&$item)
1269         {
1270
1271                 $tags = get_tags($item["body"]);
1272
1273                 // No hashtags?
1274                 if (!count($tags)) {
1275                         return false;
1276                 }
1277
1278                 // This sorting is important when there are hashtags that are part of other hashtags
1279                 // Otherwise there could be problems with hashtags like #test and #test2
1280                 rsort($tags);
1281
1282                 $URLSearchString = "^\[\]";
1283
1284                 // All hashtags should point to the home server if "local_tags" is activated
1285                 if (Config::get('system', 'local_tags')) {
1286                         $item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1287                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["body"]);
1288
1289                         $item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1290                                         "#[url=".System::baseUrl()."/search?tag=$2]$2[/url]", $item["tag"]);
1291                 }
1292
1293                 // mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
1294                 $item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1295                         function ($match) {
1296                                 return ("[url=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/url]");
1297                         }, $item["body"]);
1298
1299                 $item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
1300                         function ($match) {
1301                                 return ("[bookmark=" . str_replace("#", "&num;", $match[1]) . "]" . str_replace("#", "&num;", $match[2]) . "[/bookmark]");
1302                         }, $item["body"]);
1303
1304                 $item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
1305                         function ($match) {
1306                                 return ("[attachment " . str_replace("#", "&num;", $match[1]) . "]" . $match[2] . "[/attachment]");
1307                         }, $item["body"]);
1308
1309                 // Repair recursive urls
1310                 $item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
1311                                 "&num;$2", $item["body"]);
1312
1313                 foreach ($tags as $tag) {
1314                         if ((strpos($tag, '#') !== 0) || strpos($tag, '[url=')) {
1315                                 continue;
1316                         }
1317
1318                         $basetag = str_replace('_',' ',substr($tag,1));
1319
1320                         $newtag = '#[url=' . System::baseUrl() . '/search?tag=' . rawurlencode($basetag) . ']' . $basetag . '[/url]';
1321
1322                         $item["body"] = str_replace($tag, $newtag, $item["body"]);
1323
1324                         if (!stristr($item["tag"], "/search?tag=" . $basetag . "]" . $basetag . "[/url]")) {
1325                                 if (strlen($item["tag"])) {
1326                                         $item["tag"] = ','.$item["tag"];
1327                                 }
1328                                 $item["tag"] = $newtag.$item["tag"];
1329                         }
1330                 }
1331
1332                 // Convert back the masked hashtags
1333                 $item["body"] = str_replace("&num;", "#", $item["body"]);
1334         }
1335
1336         public static function getGuidById($id)
1337         {
1338                 $item = dba::selectFirst('item', ['guid'], ['id' => $id]);
1339                 if (DBM::is_result($item)) {
1340                         return $item['guid'];
1341                 } else {
1342                         return '';
1343                 }
1344         }
1345
1346         public static function getIdAndNickByGuid($guid, $uid = 0)
1347         {
1348                 $nick = "";
1349                 $id = 0;
1350
1351                 if ($uid == 0) {
1352                         $uid == local_user();
1353                 }
1354
1355                 // Does the given user have this item?
1356                 if ($uid) {
1357                         $item = dba::fetch_first("SELECT `item`.`id`, `user`.`nickname` FROM `item`
1358                                 INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
1359                                 WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
1360                                         AND `item`.`guid` = ? AND `item`.`uid` = ?", $guid, $uid);
1361                         if (DBM::is_result($item)) {
1362                                 $id = $item["id"];
1363                                 $nick = $item["nickname"];
1364                         }
1365                 }
1366
1367                 // Or is it anywhere on the server?
1368                 if ($nick == "") {
1369                         $item = dba::fetch_first("SELECT `item`.`id`, `user`.`nickname` FROM `item`
1370                                 INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
1371                                 WHERE `item`.`visible` AND NOT `item`.`deleted` AND NOT `item`.`moderated`
1372                                         AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
1373                                         AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
1374                                         AND NOT `item`.`private` AND `item`.`wall`
1375                                         AND `item`.`guid` = ?", $guid);
1376                         if (DBM::is_result($item)) {
1377                                 $id = $item["id"];
1378                                 $nick = $item["nickname"];
1379                         }
1380                 }
1381                 return ["nick" => $nick, "id" => $id];
1382         }
1383
1384         /**
1385          * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
1386          * @param int $uid
1387          * @param int $item_id
1388          * @return bool true if item was deleted, else false
1389          */
1390         private static function tagDeliver($uid, $item_id)
1391         {
1392                 $mention = false;
1393
1394                 $user = dba::selectFirst('user', [], ['uid' => $uid]);
1395                 if (!DBM::is_result($user)) {
1396                         return;
1397                 }
1398
1399                 $community_page = (($user['page-flags'] == PAGE_COMMUNITY) ? true : false);
1400                 $prvgroup = (($user['page-flags'] == PAGE_PRVGROUP) ? true : false);
1401
1402                 $item = dba::selectFirst('item', [], ['id' => $item_id]);
1403                 if (!DBM::is_result($item)) {
1404                         return;
1405                 }
1406
1407                 $link = normalise_link(System::baseUrl() . '/profile/' . $user['nickname']);
1408
1409                 /*
1410                  * Diaspora uses their own hardwired link URL in @-tags
1411                  * instead of the one we supply with webfinger
1412                  */
1413                 $dlink = normalise_link(System::baseUrl() . '/u/' . $user['nickname']);
1414
1415                 $cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism', $item['body'], $matches, PREG_SET_ORDER);
1416                 if ($cnt) {
1417                         foreach ($matches as $mtch) {
1418                                 if (link_compare($link, $mtch[1]) || link_compare($dlink, $mtch[1])) {
1419                                         $mention = true;
1420                                         logger('mention found: ' . $mtch[2]);
1421                                 }
1422                         }
1423                 }
1424
1425                 if (!$mention) {
1426                         if (($community_page || $prvgroup) &&
1427                                   !$item['wall'] && !$item['origin'] && ($item['id'] == $item['parent'])) {
1428                                 // mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
1429                                 // delete it!
1430                                 logger("no-mention top-level post to community or private group. delete.");
1431                                 dba::delete('item', ['id' => $item_id]);
1432                                 return true;
1433                         }
1434                         return;
1435                 }
1436
1437                 $arr = ['item' => $item, 'user' => $user];
1438
1439                 Addon::callHooks('tagged', $arr);
1440
1441                 if (!$community_page && !$prvgroup) {
1442                         return;
1443                 }
1444
1445                 /*
1446                  * tgroup delivery - setup a second delivery chain
1447                  * prevent delivery looping - only proceed
1448                  * if the message originated elsewhere and is a top-level post
1449                  */
1450                 if ($item['wall'] || $item['origin'] || ($item['id'] != $item['parent'])) {
1451                         return;
1452                 }
1453
1454                 // now change this copy of the post to a forum head message and deliver to all the tgroup members
1455                 $self = dba::selectFirst('contact', ['id', 'name', 'url', 'thumb'], ['uid' => $uid, 'self' => true]);
1456                 if (!DBM::is_result($self)) {
1457                         return;
1458                 }
1459
1460                 $owner_id = Contact::getIdForURL($self['url']);
1461
1462                 // also reset all the privacy bits to the forum default permissions
1463
1464                 $private = ($user['allow_cid'] || $user['allow_gid'] || $user['deny_cid'] || $user['deny_gid']) ? 1 : 0;
1465
1466                 $forum_mode = ($prvgroup ? 2 : 1);
1467
1468                 $fields = ['wall' => true, 'origin' => true, 'forum_mode' => $forum_mode, 'contact-id' => $self['id'],
1469                         'owner-id' => $owner_id, 'owner-name' => $self['name'], 'owner-link' => $self['url'],
1470                         'owner-avatar' => $self['thumb'], 'private' => $private, 'allow_cid' => $user['allow_cid'],
1471                         'allow_gid' => $user['allow_gid'], 'deny_cid' => $user['deny_cid'], 'deny_gid' => $user['deny_gid']];
1472                 dba::update('item', $fields, ['id' => $item_id]);
1473
1474                 self::updateThread($item_id);
1475
1476                 Worker::add(['priority' => PRIORITY_HIGH, 'dont_fork' => true], 'Notifier', 'tgroup', $item_id);
1477         }
1478
1479         public static function isRemoteSelf($contact, &$datarray)
1480         {
1481                 $a = get_app();
1482
1483                 if (!$contact['remote_self']) {
1484                         return false;
1485                 }
1486
1487                 // Prevent the forwarding of posts that are forwarded
1488                 if ($datarray["extid"] == NETWORK_DFRN) {
1489                         logger('Already forwarded', LOGGER_DEBUG);
1490                         return false;
1491                 }
1492
1493                 // Prevent to forward already forwarded posts
1494                 if ($datarray["app"] == $a->get_hostname()) {
1495                         logger('Already forwarded (second test)', LOGGER_DEBUG);
1496                         return false;
1497                 }
1498
1499                 // Only forward posts
1500                 if ($datarray["verb"] != ACTIVITY_POST) {
1501                         logger('No post', LOGGER_DEBUG);
1502                         return false;
1503                 }
1504
1505                 if (($contact['network'] != NETWORK_FEED) && $datarray['private']) {
1506                         logger('Not public', LOGGER_DEBUG);
1507                         return false;
1508                 }
1509
1510                 $datarray2 = $datarray;
1511                 logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
1512                 if ($contact['remote_self'] == 2) {
1513                         $self = dba::selectFirst('contact', ['id', 'name', 'url', 'thumb'],
1514                                         ['uid' => $contact['uid'], 'self' => true]);
1515                         if (DBM::is_result($self)) {
1516                                 $datarray['contact-id'] = $self["id"];
1517
1518                                 $datarray['owner-name'] = $self["name"];
1519                                 $datarray['owner-link'] = $self["url"];
1520                                 $datarray['owner-avatar'] = $self["thumb"];
1521
1522                                 $datarray['author-name']   = $datarray['owner-name'];
1523                                 $datarray['author-link']   = $datarray['owner-link'];
1524                                 $datarray['author-avatar'] = $datarray['owner-avatar'];
1525
1526                                 unset($datarray['created']);
1527                                 unset($datarray['edited']);
1528
1529                                 unset($datarray['network']);
1530                                 unset($datarray['owner-id']);
1531                                 unset($datarray['author-id']);
1532                         }
1533
1534                         if ($contact['network'] != NETWORK_FEED) {
1535                                 $datarray["guid"] = get_guid(32);
1536                                 unset($datarray["plink"]);
1537                                 $datarray["uri"] = item_new_uri($a->get_hostname(), $contact['uid'], $datarray["guid"]);
1538                                 $datarray["parent-uri"] = $datarray["uri"];
1539                                 $datarray["thr-parent"] = $datarray["uri"];
1540                                 $datarray["extid"] = NETWORK_DFRN;
1541                                 $urlpart = parse_url($datarray2['author-link']);
1542                                 $datarray["app"] = $urlpart["host"];
1543                         } else {
1544                                 $datarray['private'] = 0;
1545                         }
1546                 }
1547
1548                 if ($contact['network'] != NETWORK_FEED) {
1549                         // Store the original post
1550                         $result = self::insert($datarray2, false, false);
1551                         logger('remote-self post original item - Contact '.$contact['url'].' return '.$result.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
1552                 } else {
1553                         $datarray["app"] = "Feed";
1554                         $result = true;
1555                 }
1556
1557                 // Trigger automatic reactions for addons
1558                 $datarray['api_source'] = true;
1559
1560                 // We have to tell the hooks who we are - this really should be improved
1561                 $_SESSION["authenticated"] = true;
1562                 $_SESSION["uid"] = $contact['uid'];
1563
1564                 return $result;
1565         }
1566
1567         /**
1568          *
1569          * @param string $s
1570          * @param int    $uid
1571          * @param array  $item
1572          * @param int    $cid
1573          * @return string
1574          */
1575         public static function fixPrivatePhotos($s, $uid, $item = null, $cid = 0)
1576         {
1577                 if (Config::get('system', 'disable_embedded')) {
1578                         return $s;
1579                 }
1580
1581                 logger('check for photos', LOGGER_DEBUG);
1582                 $site = substr(System::baseUrl(), strpos(System::baseUrl(), '://'));
1583
1584                 $orig_body = $s;
1585                 $new_body = '';
1586
1587                 $img_start = strpos($orig_body, '[img');
1588                 $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
1589                 $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
1590
1591                 while (($img_st_close !== false) && ($img_len !== false)) {
1592                         $img_st_close++; // make it point to AFTER the closing bracket
1593                         $image = substr($orig_body, $img_start + $img_st_close, $img_len);
1594
1595                         logger('found photo ' . $image, LOGGER_DEBUG);
1596
1597                         if (stristr($image, $site . '/photo/')) {
1598                                 // Only embed locally hosted photos
1599                                 $replace = false;
1600                                 $i = basename($image);
1601                                 $i = str_replace(['.jpg', '.png', '.gif'], ['', '', ''], $i);
1602                                 $x = strpos($i, '-');
1603
1604                                 if ($x) {
1605                                         $res = substr($i, $x + 1);
1606                                         $i = substr($i, 0, $x);
1607                                         $fields = ['data', 'type', 'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid'];
1608                                         $photo = dba::selectFirst('photo', $fields, ['resource-id' => $i, 'scale' => $res, 'uid' => $uid]);
1609                                         if (DBM::is_result($photo)) {
1610                                                 /*
1611                                                  * Check to see if we should replace this photo link with an embedded image
1612                                                  * 1. No need to do so if the photo is public
1613                                                  * 2. If there's a contact-id provided, see if they're in the access list
1614                                                  *    for the photo. If so, embed it.
1615                                                  * 3. Otherwise, if we have an item, see if the item permissions match the photo
1616                                                  *    permissions, regardless of order but first check to see if they're an exact
1617                                                  *    match to save some processing overhead.
1618                                                  */
1619                                                 if (self::hasPermissions($photo)) {
1620                                                         if ($cid) {
1621                                                                 $recips = self::enumeratePermissions($photo);
1622                                                                 if (in_array($cid, $recips)) {
1623                                                                         $replace = true;
1624                                                                 }
1625                                                         } elseif ($item) {
1626                                                                 if (self::samePermissions($item, $photo)) {
1627                                                                         $replace = true;
1628                                                                 }
1629                                                         }
1630                                                 }
1631                                                 if ($replace) {
1632                                                         $data = $photo['data'];
1633                                                         $type = $photo['type'];
1634
1635                                                         // If a custom width and height were specified, apply before embedding
1636                                                         if (preg_match("/\[img\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
1637                                                                 logger('scaling photo', LOGGER_DEBUG);
1638
1639                                                                 $width = intval($match[1]);
1640                                                                 $height = intval($match[2]);
1641
1642                                                                 $Image = new Image($data, $type);
1643                                                                 if ($Image->isValid()) {
1644                                                                         $Image->scaleDown(max($width, $height));
1645                                                                         $data = $Image->asString();
1646                                                                         $type = $Image->getType();
1647                                                                 }
1648                                                         }
1649
1650                                                         logger('replacing photo', LOGGER_DEBUG);
1651                                                         $image = 'data:' . $type . ';base64,' . base64_encode($data);
1652                                                         logger('replaced: ' . $image, LOGGER_DATA);
1653                                                 }
1654                                         }
1655                                 }
1656                         }
1657
1658                         $new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/img]';
1659                         $orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
1660                         if ($orig_body === false) {
1661                                 $orig_body = '';
1662                         }
1663
1664                         $img_start = strpos($orig_body, '[img');
1665                         $img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
1666                         $img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
1667                 }
1668
1669                 $new_body = $new_body . $orig_body;
1670
1671                 return $new_body;
1672         }
1673
1674         private static function hasPermissions($obj)
1675         {
1676                 return (
1677                         (
1678                                 x($obj, 'allow_cid')
1679                         ) || (
1680                                 x($obj, 'allow_gid')
1681                         ) || (
1682                                 x($obj, 'deny_cid')
1683                         ) || (
1684                                 x($obj, 'deny_gid')
1685                         )
1686                 );
1687         }
1688
1689         private static function samePermissions($obj1, $obj2)
1690         {
1691                 // first part is easy. Check that these are exactly the same.
1692                 if (($obj1['allow_cid'] == $obj2['allow_cid'])
1693                         && ($obj1['allow_gid'] == $obj2['allow_gid'])
1694                         && ($obj1['deny_cid'] == $obj2['deny_cid'])
1695                         && ($obj1['deny_gid'] == $obj2['deny_gid'])) {
1696                         return true;
1697                 }
1698
1699                 // This is harder. Parse all the permissions and compare the resulting set.
1700                 $recipients1 = self::enumeratePermissions($obj1);
1701                 $recipients2 = self::enumeratePermissions($obj2);
1702                 sort($recipients1);
1703                 sort($recipients2);
1704
1705                 /// @TODO Comparison of arrays, maybe use array_diff_assoc() here?
1706                 return ($recipients1 == $recipients2);
1707         }
1708
1709         // returns an array of contact-ids that are allowed to see this object
1710         private static function enumeratePermissions($obj)
1711         {
1712                 $allow_people = expand_acl($obj['allow_cid']);
1713                 $allow_groups = Group::expand(expand_acl($obj['allow_gid']));
1714                 $deny_people  = expand_acl($obj['deny_cid']);
1715                 $deny_groups  = Group::expand(expand_acl($obj['deny_gid']));
1716                 $recipients   = array_unique(array_merge($allow_people, $allow_groups));
1717                 $deny         = array_unique(array_merge($deny_people, $deny_groups));
1718                 $recipients   = array_diff($recipients, $deny);
1719                 return $recipients;
1720         }
1721
1722         public static function getFeedTags($item)
1723         {
1724                 $ret = [];
1725                 $matches = false;
1726                 $cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
1727                 if ($cnt) {
1728                         for ($x = 0; $x < $cnt; $x ++) {
1729                                 if ($matches[1][$x]) {
1730                                         $ret[$matches[2][$x]] = ['#', $matches[1][$x], $matches[2][$x]];
1731                                 }
1732                         }
1733                 }
1734                 $matches = false;
1735                 $cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|', $item['tag'], $matches);
1736                 if ($cnt) {
1737                         for ($x = 0; $x < $cnt; $x ++) {
1738                                 if ($matches[1][$x]) {
1739                                         $ret[] = ['@', $matches[1][$x], $matches[2][$x]];
1740                                 }
1741                         }
1742                 }
1743                 return $ret;
1744         }
1745
1746         public static function expire($uid, $days, $network = "", $force = false)
1747         {
1748                 if (!$uid || ($days < 1)) {
1749                         return;
1750                 }
1751
1752                 /*
1753                  * $expire_network_only = save your own wall posts
1754                  * and just expire conversations started by others
1755                  */
1756                 $expire_network_only = PConfig::get($uid,'expire', 'network_only');
1757                 $sql_extra = (intval($expire_network_only) ? " AND wall = 0 " : "");
1758
1759                 if ($network != "") {
1760                         $sql_extra .= sprintf(" AND network = '%s' ", dbesc($network));
1761
1762                         /*
1763                          * There is an index "uid_network_received" but not "uid_network_created"
1764                          * This avoids the creation of another index just for one purpose.
1765                          * And it doesn't really matter wether to look at "received" or "created"
1766                          */
1767                         $range = "AND `received` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
1768                 } else {
1769                         $range = "AND `created` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
1770                 }
1771
1772                 $r = q("SELECT `file`, `resource-id`, `starred`, `type`, `id` FROM `item`
1773                         WHERE `uid` = %d $range
1774                         AND `id` = `parent`
1775                         $sql_extra
1776                         AND `deleted` = 0",
1777                         intval($uid),
1778                         intval($days)
1779                 );
1780
1781                 if (!DBM::is_result($r)) {
1782                         return;
1783                 }
1784
1785                 $expire_items = PConfig::get($uid, 'expire', 'items', 1);
1786
1787                 // Forcing expiring of items - but not notes and marked items
1788                 if ($force) {
1789                         $expire_items = true;
1790                 }
1791
1792                 $expire_notes = PConfig::get($uid, 'expire', 'notes', 1);
1793                 $expire_starred = PConfig::get($uid, 'expire', 'starred', 1);
1794                 $expire_photos = PConfig::get($uid, 'expire', 'photos', 0);
1795
1796                 logger('User '.$uid.': expire: # items=' . count($r). "; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");
1797
1798                 foreach ($r as $item) {
1799
1800                         // don't expire filed items
1801
1802                         if (strpos($item['file'],'[') !== false) {
1803                                 continue;
1804                         }
1805
1806                         // Only expire posts, not photos and photo comments
1807
1808                         if ($expire_photos == 0 && strlen($item['resource-id'])) {
1809                                 continue;
1810                         } elseif ($expire_starred == 0 && intval($item['starred'])) {
1811                                 continue;
1812                         } elseif ($expire_notes == 0 && $item['type'] == 'note') {
1813                                 continue;
1814                         } elseif ($expire_items == 0 && $item['type'] != 'note') {
1815                                 continue;
1816                         }
1817
1818                         self::deleteById($item['id'], PRIORITY_LOW);
1819                 }
1820         }
1821
1822         public static function firstPostDate($uid, $wall = false)
1823         {
1824                 $condition = ['uid' => $uid, 'wall' => $wall, 'deleted' => false, 'visible' => true, 'moderated' => false];
1825                 $params = ['order' => ['created' => false]];
1826                 $thread = dba::selectFirst('thread', ['created'], $condition, $params);
1827                 if (DBM::is_result($thread)) {
1828                         return substr(DateTimeFormat::local($thread['created']), 0, 10);
1829                 }
1830                 return false;
1831         }
1832
1833         /**
1834          * @brief add/remove activity to an item
1835          *
1836          * Toggle activities as like,dislike,attend of an item
1837          *
1838          * @param string $item_id
1839          * @param string $verb
1840          *              Activity verb. One of
1841          *                      like, unlike, dislike, undislike, attendyes, unattendyes,
1842          *                      attendno, unattendno, attendmaybe, unattendmaybe
1843          * @hook 'post_local_end'
1844          *              array $arr
1845          *                      'post_id' => ID of posted item
1846          */
1847         public static function performLike($item_id, $verb)
1848         {
1849                 if (!local_user() && !remote_user()) {
1850                         return false;
1851                 }
1852
1853                 switch ($verb) {
1854                         case 'like':
1855                         case 'unlike':
1856                                 $bodyverb = L10n::t('%1$s likes %2$s\'s %3$s');
1857                                 $activity = ACTIVITY_LIKE;
1858                                 break;
1859                         case 'dislike':
1860                         case 'undislike':
1861                                 $bodyverb = L10n::t('%1$s doesn\'t like %2$s\'s %3$s');
1862                                 $activity = ACTIVITY_DISLIKE;
1863                                 break;
1864                         case 'attendyes':
1865                         case 'unattendyes':
1866                                 $bodyverb = L10n::t('%1$s is attending %2$s\'s %3$s');
1867                                 $activity = ACTIVITY_ATTEND;
1868                                 break;
1869                         case 'attendno':
1870                         case 'unattendno':
1871                                 $bodyverb = L10n::t('%1$s is not attending %2$s\'s %3$s');
1872                                 $activity = ACTIVITY_ATTENDNO;
1873                                 break;
1874                         case 'attendmaybe':
1875                         case 'unattendmaybe':
1876                                 $bodyverb = L10n::t('%1$s may attend %2$s\'s %3$s');
1877                                 $activity = ACTIVITY_ATTENDMAYBE;
1878                                 break;
1879                         default:
1880                                 logger('like: unknown verb ' . $verb . ' for item ' . $item_id);
1881                                 return false;
1882                 }
1883
1884                 // Enable activity toggling instead of on/off
1885                 $event_verb_flag = $activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE;
1886
1887                 logger('like: verb ' . $verb . ' item ' . $item_id);
1888
1889                 $item = dba::selectFirst('item', [], ['`id` = ? OR `uri` = ?', $item_id, $item_id]);
1890                 if (!DBM::is_result($item)) {
1891                         logger('like: unknown item ' . $item_id);
1892                         return false;
1893                 }
1894
1895                 $uid = $item['uid'];
1896                 if (($uid == 0) && local_user()) {
1897                         $uid = local_user();
1898                 }
1899
1900                 if (!can_write_wall($uid)) {
1901                         logger('like: unable to write on wall ' . $uid);
1902                         return false;
1903                 }
1904
1905                 // Retrieves the local post owner
1906                 $owner_self_contact = dba::selectFirst('contact', [], ['uid' => $uid, 'self' => true]);
1907                 if (!DBM::is_result($owner_self_contact)) {
1908                         logger('like: unknown owner ' . $uid);
1909                         return false;
1910                 }
1911
1912                 // Retrieve the current logged in user's public contact
1913                 $author_id = public_contact();
1914
1915                 $author_contact = dba::selectFirst('contact', [], ['id' => $author_id]);
1916                 if (!DBM::is_result($author_contact)) {
1917                         logger('like: unknown author ' . $author_id);
1918                         return false;
1919                 }
1920
1921                 // Contact-id is the uid-dependant author contact
1922                 if (local_user() == $uid) {
1923                         $item_contact_id = $owner_self_contact['id'];
1924                         $item_contact = $owner_self_contact;
1925                 } else {
1926                         $item_contact_id = Contact::getIdForURL($author_contact['url'], $uid, true);
1927                         $item_contact = dba::selectFirst('contact', [], ['id' => $item_contact_id]);
1928                         if (!DBM::is_result($item_contact)) {
1929                                 logger('like: unknown item contact ' . $item_contact_id);
1930                                 return false;
1931                         }
1932                 }
1933
1934                 // Look for an existing verb row
1935                 // event participation are essentially radio toggles. If you make a subsequent choice,
1936                 // we need to eradicate your first choice.
1937                 if ($event_verb_flag) {
1938                         $verbs = "'" . dbesc(ACTIVITY_ATTEND) . "', '" . dbesc(ACTIVITY_ATTENDNO) . "', '" . dbesc(ACTIVITY_ATTENDMAYBE) . "'";
1939                 } else {
1940                         $verbs = "'".dbesc($activity)."'";
1941                 }
1942
1943                 /// @todo This query is expected to be a performance eater due to the "OR" - it has to be changed totally
1944                 $existing_like = q("SELECT `id`, `guid`, `verb` FROM `item`
1945                         WHERE `verb` IN ($verbs)
1946                         AND `deleted` = 0
1947                         AND `author-id` = %d
1948                         AND `uid` = %d
1949                         AND (`parent` = '%s' OR `parent-uri` = '%s' OR `thr-parent` = '%s')
1950                         LIMIT 1",
1951                         intval($author_contact['id']),
1952                         intval($item['uid']),
1953                         dbesc($item_id), dbesc($item_id), dbesc($item['uri'])
1954                 );
1955
1956                 // If it exists, mark it as deleted
1957                 if (DBM::is_result($existing_like)) {
1958                         $like_item = $existing_like[0];
1959
1960                         // Already voted, undo it
1961                         $fields = ['deleted' => true, 'unseen' => true, 'changed' => DateTimeFormat::utcNow()];
1962                         dba::update('item', $fields, ['id' => $like_item['id']]);
1963
1964                         // Clean up the Diaspora signatures for this like
1965                         // Go ahead and do it even if Diaspora support is disabled. We still want to clean up
1966                         // if it had been enabled in the past
1967                         dba::delete('sign', ['iid' => $like_item['id']]);
1968
1969                         $like_item_id = $like_item['id'];
1970                         Worker::add(PRIORITY_HIGH, "Notifier", "like", $like_item_id);
1971
1972                         if (!$event_verb_flag || $like_item['verb'] == $activity) {
1973                                 return true;
1974                         }
1975                 }
1976
1977                 // Verb is "un-something", just trying to delete existing entries
1978                 if (strpos($verb, 'un') === 0) {
1979                         return true;
1980                 }
1981
1982                 // Else or if event verb different from existing row, create a new item row
1983                 $post_type = (($item['resource-id']) ? L10n::t('photo') : L10n::t('status'));
1984                 if ($item['object-type'] === ACTIVITY_OBJ_EVENT) {
1985                         $post_type = L10n::t('event');
1986                 }
1987                 $objtype = $item['resource-id'] ? ACTIVITY_OBJ_IMAGE : ACTIVITY_OBJ_NOTE ;
1988                 $link = xmlify('<link rel="alternate" type="text/html" href="' . System::baseUrl() . '/display/' . $owner_self_contact['nick'] . '/' . $item['id'] . '" />' . "\n") ;
1989                 $body = $item['body'];
1990
1991                 $obj = <<< EOT
1992
1993                 <object>
1994                         <type>$objtype</type>
1995                         <local>1</local>
1996                         <id>{$item['uri']}</id>
1997                         <link>$link</link>
1998                         <title></title>
1999                         <content>$body</content>
2000                 </object>
2001 EOT;
2002
2003                 $ulink = '[url=' . $author_contact['url'] . ']' . $author_contact['name'] . '[/url]';
2004                 $alink = '[url=' . $item['author-link'] . ']' . $item['author-name'] . '[/url]';
2005                 $plink = '[url=' . System::baseUrl() . '/display/' . $owner_self_contact['nick'] . '/' . $item['id'] . ']' . $post_type . '[/url]';
2006
2007                 $new_item = [
2008                         'guid'          => get_guid(32),
2009                         'uri'           => item_new_uri(self::getApp()->get_hostname(), $item['uid']),
2010                         'uid'           => $item['uid'],
2011                         'contact-id'    => $item_contact_id,
2012                         'type'          => 'activity',
2013                         'wall'          => $item['wall'],
2014                         'origin'        => 1,
2015                         'gravity'       => GRAVITY_LIKE,
2016                         'parent'        => $item['id'],
2017                         'parent-uri'    => $item['uri'],
2018                         'thr-parent'    => $item['uri'],
2019                         'owner-id'      => $item['owner-id'],
2020                         'owner-name'    => $item['owner-name'],
2021                         'owner-link'    => $item['owner-link'],
2022                         'owner-avatar'  => $item['owner-avatar'],
2023                         'author-id'     => $author_contact['id'],
2024                         'author-name'   => $author_contact['name'],
2025                         'author-link'   => $author_contact['url'],
2026                         'author-avatar' => $author_contact['thumb'],
2027                         'body'          => sprintf($bodyverb, $ulink, $alink, $plink),
2028                         'verb'          => $activity,
2029                         'object-type'   => $objtype,
2030                         'object'        => $obj,
2031                         'allow_cid'     => $item['allow_cid'],
2032                         'allow_gid'     => $item['allow_gid'],
2033                         'deny_cid'      => $item['deny_cid'],
2034                         'deny_gid'      => $item['deny_gid'],
2035                         'visible'       => 1,
2036                         'unseen'        => 1,
2037                 ];
2038
2039                 $new_item_id = self::insert($new_item);
2040
2041                 // If the parent item isn't visible then set it to visible
2042                 if (!$item['visible']) {
2043                         self::update(['visible' => true], ['id' => $item['id']]);
2044                 }
2045
2046                 // Save the author information for the like in case we need to relay to Diaspora
2047                 Diaspora::storeLikeSignature($item_contact, $new_item_id);
2048
2049                 $new_item['id'] = $new_item_id;
2050
2051                 Addon::callHooks('post_local_end', $new_item);
2052
2053                 Worker::add(PRIORITY_HIGH, "Notifier", "like", $new_item_id);
2054
2055                 return true;
2056         }
2057
2058         private static function addThread($itemid, $onlyshadow = false)
2059         {
2060                 $fields = ['uid', 'created', 'edited', 'commented', 'received', 'changed', 'wall', 'private', 'pubmail',
2061                         'moderated', 'visible', 'spam', 'starred', 'bookmark', 'contact-id',
2062                         'deleted', 'origin', 'forum_mode', 'mention', 'network', 'author-id', 'owner-id'];
2063                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2064                 $item = dba::selectFirst('item', $fields, $condition);
2065
2066                 if (!DBM::is_result($item)) {
2067                         return;
2068                 }
2069
2070                 $item['iid'] = $itemid;
2071
2072                 if (!$onlyshadow) {
2073                         $result = dba::insert('thread', $item);
2074
2075                         logger("Add thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
2076                 }
2077         }
2078
2079         private static function updateThread($itemid, $setmention = false)
2080         {
2081                 $fields = ['uid', 'guid', 'title', 'body', 'created', 'edited', 'commented', 'received', 'changed',
2082                         'wall', 'private', 'pubmail', 'moderated', 'visible', 'spam', 'starred', 'bookmark', 'contact-id',
2083                         'deleted', 'origin', 'forum_mode', 'network', 'author-id', 'owner-id', 'rendered-html', 'rendered-hash'];
2084                 $condition = ["`id` = ? AND (`parent` = ? OR `parent` = 0)", $itemid, $itemid];
2085
2086                 $item = dba::selectFirst('item', $fields, $condition);
2087                 if (!DBM::is_result($item)) {
2088                         return;
2089                 }
2090
2091                 if ($setmention) {
2092                         $item["mention"] = 1;
2093                 }
2094
2095                 $sql = "";
2096
2097                 $fields = [];
2098
2099                 foreach ($item as $field => $data) {
2100                         if (!in_array($field, ["guid", "title", "body", "rendered-html", "rendered-hash"])) {
2101                                 $fields[$field] = $data;
2102                         }
2103                 }
2104
2105                 $result = dba::update('thread', $fields, ['iid' => $itemid]);
2106
2107                 logger("Update thread for item ".$itemid." - guid ".$item["guid"]." - ".(int)$result, LOGGER_DEBUG);
2108
2109                 // Updating a shadow item entry
2110                 $items = dba::selectFirst('item', ['id'], ['guid' => $item['guid'], 'uid' => 0]);
2111
2112                 if (!DBM::is_result($items)) {
2113                         return;
2114                 }
2115
2116                 $fields = ['title' => $item['title'], 'body' => $item['body'],
2117                         'rendered-html' => $item['rendered-html'], 'rendered-hash' => $item['rendered-hash']];
2118                 $result = dba::update('item', $fields, ['id' => $items['id']]);
2119
2120                 logger("Updating public shadow for post ".$items["id"]." - guid ".$item["guid"]." Result: ".print_r($result, true), LOGGER_DEBUG);
2121         }
2122
2123         private static function deleteThread($itemid, $itemuri = "")
2124         {
2125                 $item = dba::selectFirst('thread', ['uid'], ['iid' => $itemid]);
2126                 if (!DBM::is_result($item)) {
2127                         logger('No thread found for id '.$itemid, LOGGER_DEBUG);
2128                         return;
2129                 }
2130
2131                 // Using dba::delete at this time could delete the associated item entries
2132                 $result = dba::e("DELETE FROM `thread` WHERE `iid` = ?", $itemid);
2133
2134                 logger("deleteThread: Deleted thread for item ".$itemid." - ".print_r($result, true), LOGGER_DEBUG);
2135
2136                 if ($itemuri != "") {
2137                         $condition = ["`uri` = ? AND NOT `deleted` AND NOT (`uid` IN (?, 0))", $itemuri, $item["uid"]];
2138                         if (!dba::exists('item', $condition)) {
2139                                 dba::delete('item', ['uri' => $itemuri, 'uid' => 0]);
2140                                 logger("deleteThread: Deleted shadow for item ".$itemuri, LOGGER_DEBUG);
2141                         }
2142                 }
2143         }
2144 }