src/Model/Post/UserNotification.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Model\Post;
  23
  24 use BadMethodCallException;
  25 use Exception;
  26 use Friendica\Core\Hook;
  27 use Friendica\Core\Logger;
  28 use Friendica\Database\Database;
  29 use Friendica\Database\DBA;
  30 use Friendica\DI;
  31 use Friendica\Model\Contact;
  32 use Friendica\Model\Item;
  33 use Friendica\Model\Post;
  34 use Friendica\Model\Subscription;
  35 use Friendica\Model\Tag;
  36 use Friendica\Model\User;
  37 use Friendica\Network\HTTPException;
  38 use Friendica\Protocol\Activity;
  39 use Friendica\Util\Strings;
  40
  41 class UserNotification
  42 {
  43         // Notification types
  44         const TYPE_NONE                   = 0;
  45         const TYPE_EXPLICIT_TAGGED        = 1;
  46         const TYPE_IMPLICIT_TAGGED        = 2;
  47         const TYPE_THREAD_COMMENT         = 4;
  48         const TYPE_DIRECT_COMMENT         = 8;
  49         const TYPE_COMMENT_PARTICIPATION  = 16;
  50         const TYPE_ACTIVITY_PARTICIPATION = 32;
  51         const TYPE_DIRECT_THREAD_COMMENT  = 64;
  52         const TYPE_SHARED                 = 128;
  53         const TYPE_FOLLOW                 = 256;
  54         const TYPE_QUOTED                 = 512;
  55
  56         /**
  57          * Insert a new user notification entry
  58          *
  59          * @param integer $uri_id
  60          * @param integer $uid
  61          * @param array   $data
  62          * @return bool   success
  63          * @throws Exception
  64          */
  65         public static function insert(int $uri_id, int $uid, array $data = []): bool
  66         {
  67                 if (empty($uri_id)) {
  68                         throw new BadMethodCallException('Empty URI_id');
  69                 }
  70
  71                 $fields = DI::dbaDefinition()->truncateFieldsForTable('post-user-notification', $data);
  72
  73                 $fields['uri-id'] = $uri_id;
  74                 $fields['uid']    = $uid;
  75
  76                 return DBA::insert('post-user-notification', $fields, Database::INSERT_IGNORE);
  77         }
  78
  79         /**
  80          * Update a user notification entry
  81          *
  82          * @param integer $uri_id
  83          * @param integer $uid
  84          * @param array   $data
  85          * @param bool    $insert_if_missing
  86          * @return bool
  87          * @throws Exception
  88          */
  89         public static function update(int $uri_id, int $uid, array $data = [], bool $insert_if_missing = false): bool
  90         {
  91                 if (empty($uri_id)) {
  92                         throw new BadMethodCallException('Empty URI_id');
  93                 }
  94
  95                 $fields = DI::dbaDefinition()->truncateFieldsForTable('post-user-notification', $data);
  96
  97                 // Remove the key fields
  98                 unset($fields['uri-id']);
  99                 unset($fields['uid']);
 100
 101                 if (empty($fields)) {
 102                         return true;
 103                 }
 104
 105                 return DBA::update('post-user-notification', $fields, ['uri-id' => $uri_id, 'uid' => $uid], $insert_if_missing ? true : []);
 106         }
 107
 108         /**
 109          * Delete a row from the post-user-notification table
 110          *
 111          * @param array $conditions  Field condition(s)
 112          * @param array $options     - cascade: If true we delete records in other tables that depend on the one we're deleting through
 113          *                           relations (default: true)
 114          *
 115          * @return boolean was the deletion successful?
 116          * @throws Exception
 117          */
 118         public static function delete(array $conditions, array $options = []): bool
 119         {
 120                 return DBA::delete('post-user-notification', $conditions, $options);
 121         }
 122
 123         /**
 124          * Checks an item for notifications and sets the "notification-type" field
 125          *
 126          * @ToDo:
 127          * - Check for mentions in posts with "uid=0" where the user hadn't interacted before
 128          *
 129          * @param int $uri_id URI ID
 130          * @param int $uid    user ID
 131          * @throws Exception
 132          */
 133         public static function setNotification(int $uri_id, int $uid)
 134         {
 135                 $fields = ['id', 'uri-id', 'parent-uri-id', 'uid', 'body', 'parent', 'gravity', 'vid', 'gravity',
 136                         'contact-id', 'author-id', 'author-gsid', 'owner-id', 'owner-gsid', 'causer-id', 'causer-gsid',
 137                         'private', 'thr-parent', 'thr-parent-id', 'parent-uri-id', 'parent-uri', 'verb'];
 138                 $item   = Post::selectFirst($fields, ['uri-id' => $uri_id, 'uid' => $uid, 'origin' => false]);
 139                 if (!DBA::isResult($item)) {
 140                         return;
 141                 }
 142
 143                 $parent = Post::selectFirstPost(['author-id', 'author-gsid', 'owner-id', 'owner-gsid', 'causer-id', 'causer-gsid',], ['uri-id' => $item['parent-uri-id']]);
 144                 if (!DBA::isResult($parent)) {
 145                         return;
 146                 }
 147
 148                 // "Activity::FOLLOW" is an automated activity, so we ignore it here
 149                 if ($item['verb'] == Activity::FOLLOW) {
 150                         return;
 151                 }
 152
 153                 if ($item['uid'] == 0) {
 154                         $uids = [];
 155                 } else {
 156                         // Always include the item user
 157                         $uids = [$item['uid']];
 158                 }
 159
 160                 // Add every user who participated so far in this thread
 161                 // This can only happen with participations on global items. (means: uid = 0)
 162                 $users = DBA::p("SELECT DISTINCT(`contact-uid`) AS `uid` FROM `post-user-view`
 163                         WHERE `contact-uid` != 0 AND `parent-uri-id` = ? AND `uid` = ?", $item['parent-uri-id'], $uid);
 164                 while ($user = DBA::fetch($users)) {
 165                         $uids[] = $user['uid'];
 166                 }
 167                 DBA::close($users);
 168
 169                 foreach (array_unique($uids) as $uid) {
 170                         self::setNotificationForUser($item, $parent, $uid);
 171                 }
 172         }
 173
 174         /**
 175          * Checks an item for notifications for the given user and sets the "notification-type" field
 176          *
 177          * @param array $item   Item array
 178          * @param array $parent Parent item array
 179          * @param int   $uid    User ID
 180          * @throws HTTPException\InternalServerErrorException
 181          */
 182         private static function setNotificationForUser(array $item, array $parent, int $uid)
 183         {
 184                 if (Post\ThreadUser::getIgnored($item['parent-uri-id'], $uid)) {
 185                         return;
 186                 }
 187
 188                 foreach (array_unique([$parent['author-id'], $parent['owner-id'], $parent['causer-id'], $item['author-id'], $item['owner-id'], $item['causer-id']]) as $author_id) {
 189                         if (empty($author_id)) {
 190                                 continue;
 191                         }
 192                         if (Contact\User::isBlocked($author_id, $uid) || Contact\User::isIgnored($author_id, $uid) || Contact\User::isCollapsed($author_id, $uid)) {
 193                                 Logger::debug('Author is blocked/ignored/collapsed by user', ['uid' => $uid, 'author' => $author_id, 'uri-id' => $item['uri-id']]);
 194                                 return;
 195                         }
 196                 }
 197
 198                 foreach (array_unique([$parent['author-gsid'], $parent['owner-gsid'], $parent['causer-gsid'], $item['author-gsid'], $item['owner-gsid'], $item['causer-gsid']]) as $gsid) {
 199                         if ($gsid && DI::userGServer()->isIgnoredByUser($uid, $gsid)) {
 200                                 Logger::debug('Server is ignored by user', ['uid' => $uid, 'gsid' => $gsid, 'uri-id' => $item['uri-id']]);
 201                                 return;
 202                         }
 203                 }
 204
 205                 $user = User::getById($uid, ['account-type', 'account_removed', 'account_expired']);
 206                 if (in_array($user['account-type'], [User::ACCOUNT_TYPE_COMMUNITY, User::ACCOUNT_TYPE_RELAY])) {
 207                         return;
 208                 }
 209
 210                 if ($user['account_removed'] || $user['account_expired']) {
 211                         return;
 212                 }
 213
 214                 $author = Contact::getById($item['author-id'], ['contact-type']);
 215                 if (empty($author)) {
 216                         return;
 217                 }
 218
 219                 $notification_type = self::TYPE_NONE;
 220
 221                 if (self::checkShared($item, $uid)) {
 222                         $notification_type = $notification_type | self::TYPE_SHARED;
 223                         self::insertNotificationByItem(self::TYPE_SHARED, $uid, $item);
 224                         $notified = true;
 225                 } elseif ($author['contact-type'] == Contact::TYPE_COMMUNITY) {
 226                         return;
 227                 } else {
 228                         $notified = false;
 229                 }
 230
 231                 $profiles = self::getProfileForUser($uid);
 232
 233                 // Fetch all contacts for the given profiles
 234                 $contacts    = [];
 235                 $iscommunity = false;
 236
 237                 $ret = DBA::select('contact', ['id', 'contact-type'], ['uid' => 0, 'nurl' => $profiles]);
 238                 while ($contact = DBA::fetch($ret)) {
 239                         $contacts[] = $contact['id'];
 240
 241                         if ($contact['contact-type'] == Contact::TYPE_COMMUNITY) {
 242                                 $iscommunity = true;
 243                         }
 244                 }
 245                 DBA::close($ret);
 246
 247                 // Don't create notifications for user's posts
 248                 if (in_array($item['author-id'], $contacts)) {
 249                         return;
 250                 }
 251
 252                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkExplicitMention($item, $profiles)) {
 253                         $notification_type = $notification_type | self::TYPE_EXPLICIT_TAGGED;
 254                         if (!$notified) {
 255                                 self::insertNotificationByItem(self::TYPE_EXPLICIT_TAGGED, $uid, $item);
 256                                 $notified = true;
 257                         }
 258                 }
 259
 260                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkImplicitMention($item, $profiles)) {
 261                         $notification_type = $notification_type | self::TYPE_IMPLICIT_TAGGED;
 262                         if (!$notified) {
 263                                 self::insertNotificationByItem(self::TYPE_IMPLICIT_TAGGED, $uid, $item);
 264                                 $notified = true;
 265                         }
 266                 }
 267
 268                 if (self::checkDirectComment($item, $contacts)) {
 269                         $notification_type = $notification_type | self::TYPE_DIRECT_COMMENT;
 270                         if (!$notified) {
 271                                 self::insertNotificationByItem(self::TYPE_DIRECT_COMMENT, $uid, $item);
 272                                 $notified = true;
 273                         }
 274                 }
 275
 276                 if (!$iscommunity && self::checkDirectCommentedThread($item, $contacts)) {
 277                         $notification_type = $notification_type | self::TYPE_DIRECT_THREAD_COMMENT;
 278                         if (!$notified) {
 279                                 self::insertNotificationByItem(self::TYPE_DIRECT_THREAD_COMMENT, $uid, $item);
 280                                 $notified = true;
 281                         }
 282                 }
 283
 284                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkCommentedThread($item, $contacts)) {
 285                         $notification_type = $notification_type | self::TYPE_THREAD_COMMENT;
 286                         if (!$notified) {
 287                                 self::insertNotificationByItem(self::TYPE_THREAD_COMMENT, $uid, $item);
 288                                 $notified = true;
 289                         }
 290                 }
 291
 292                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkCommentedParticipation($item, $contacts)) {
 293                         $notification_type = $notification_type | self::TYPE_COMMENT_PARTICIPATION;
 294                         if (!$notified) {
 295                                 self::insertNotificationByItem(self::TYPE_COMMENT_PARTICIPATION, $uid, $item);
 296                                 $notified = true;
 297                         }
 298                 }
 299
 300                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkQuoted($item, $contacts)) {
 301                         $notification_type = $notification_type | self::TYPE_QUOTED;
 302                         if (!$notified) {
 303                                 self::insertNotificationByItem(self::TYPE_QUOTED, $uid, $item);
 304                                 $notified = true;
 305                         }
 306                 }
 307
 308                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkFollowParticipation($item, $contacts)) {
 309                         $notification_type = $notification_type | self::TYPE_FOLLOW;
 310                         if (!$notified) {
 311                                 self::insertNotificationByItem(self::TYPE_FOLLOW, $uid, $item);
 312                                 $notified = true;
 313                         }
 314                 }
 315
 316                 if (($item['verb'] != Activity::ANNOUNCE) && self::checkActivityParticipation($item, $contacts)) {
 317                         $notification_type = $notification_type | self::TYPE_ACTIVITY_PARTICIPATION;
 318                         if (!$notified) {
 319                                 self::insertNotificationByItem(self::TYPE_ACTIVITY_PARTICIPATION, $uid, $item);
 320                         }
 321                 }
 322
 323                 if (empty($notification_type)) {
 324                         return;
 325                 }
 326
 327                 // Only create notifications for posts and comments, not for activities
 328                 if (($item['gravity'] == Item::GRAVITY_ACTIVITY) && ($item['verb'] != Activity::ANNOUNCE)) {
 329                         return;
 330                 }
 331
 332                 Logger::info('Set notification', ['uri-id' => $item['uri-id'], 'uid' => $uid, 'notification-type' => $notification_type]);
 333
 334                 $fields = ['notification-type' => $notification_type];
 335                 Post\User::update($item['uri-id'], $uid, $fields);
 336                 self::update($item['uri-id'], $uid, $fields, true);
 337         }
 338
 339         /**
 340          * Add a notification entry for a given item array
 341          *
 342          * @param int   $type User notification type
 343          * @param int   $uid  User ID
 344          * @param array $item Item array
 345          * @return void
 346          * @throws Exception
 347          */
 348         private static function insertNotificationByItem(int $type, int $uid, array $item): void
 349         {
 350                 if (($item['verb'] != Activity::ANNOUNCE) && ($item['gravity'] == Item::GRAVITY_ACTIVITY) &&
 351                         !in_array($type, [self::TYPE_DIRECT_COMMENT, self::TYPE_DIRECT_THREAD_COMMENT])) {
 352                         // Activities are only stored when performed on the user's post or comment
 353                         return;
 354                 }
 355
 356                 $notification = DI::notificationFactory()->createForUser(
 357                         $uid,
 358                         $item['vid'],
 359                         $type,
 360                         $item['author-id'],
 361                         $item['gravity'] == Item::GRAVITY_ACTIVITY ? $item['thr-parent-id'] : $item['uri-id'],
 362                         $item['parent-uri-id']
 363                 );
 364
 365                 try {
 366                         $notification = DI::notification()->save($notification);
 367                         Subscription::pushByNotification($notification);
 368                 } catch (Exception $e) {
 369
 370                 }
 371         }
 372
 373         /**
 374          * Add a notification entry
 375          *
 376          * @param int    $actor Public contact ID of the actor
 377          * @param string $verb  One of the Activity verb constant values
 378          * @param int    $uid   User ID
 379          * @return boolean
 380          * @throws Exception
 381          */
 382         public static function insertNotification(int $actor, string $verb, int $uid): bool
 383         {
 384                 $notification = DI::notificationFactory()->createForRelationship(
 385                         $uid,
 386                         $actor,
 387                         $verb
 388                 );
 389                 try {
 390                         $notification = DI::notification()->save($notification);
 391                         Subscription::pushByNotification($notification);
 392                         return true;
 393                 } catch (Exception $e) {
 394                         return false;
 395                 }
 396         }
 397
 398         /**
 399          * Fetch all profiles (contact URL) of a given user
 400          *
 401          * @param int $uid User ID
 402          *
 403          * @return array Profile links
 404          * @throws HTTPException\InternalServerErrorException
 405          */
 406         private static function getProfileForUser(int $uid): array
 407         {
 408                 $owner = User::getOwnerDataById($uid);
 409                 if (!DBA::isResult($owner)) {
 410                         return [];
 411                 }
 412
 413                 $profiles = [$owner['nurl']];
 414
 415                 $notification_data = ['uid' => $uid, 'profiles' => []];
 416                 Hook::callAll('check_item_notification', $notification_data);
 417
 418                 // Normalize the connector profiles
 419                 foreach ($notification_data['profiles'] as $profile) {
 420                         if (empty(parse_url($profile, PHP_URL_SCHEME)) || empty(parse_url($profile, PHP_URL_HOST)) || empty(parse_url($profile, PHP_URL_PATH))) {
 421                                 $profiles[] = $profile;
 422                         } else {
 423                                 $profiles[] = Strings::normaliseLink($profile);
 424                         }
 425                 }
 426
 427                 return array_unique($profiles);
 428         }
 429
 430         /**
 431          * Check for a "shared" notification for every new post of contacts from the given user
 432          *
 433          * @param array $item
 434          * @param int   $uid User ID
 435          * @return bool A contact had shared something
 436          * @throws Exception
 437          */
 438         private static function checkShared(array $item, int $uid): bool
 439         {
 440                 // Only check on original posts and reshare ("announce") activities, otherwise return
 441                 if (($item['gravity'] != Item::GRAVITY_PARENT) && ($item['verb'] != Activity::ANNOUNCE)) {
 442                         return false;
 443                 }
 444
 445                 // Don't notify about reshares by communities of our own posts or each time someone comments
 446                 if (($item['verb'] == Activity::ANNOUNCE) && DBA::exists('contact', ['id' => $item['contact-id'], 'contact-type' => Contact::TYPE_COMMUNITY])) {
 447                         $post = Post::selectFirst(['origin', 'gravity'], ['uri-id' => $item['thr-parent-id'], 'uid' => $uid]);
 448                         if (!$post || $post['origin'] || ($post['gravity'] != Item::GRAVITY_PARENT)) {
 449                                 return false;
 450                         }
 451                 }
 452
 453                 // Only check on posts by the user itself
 454                 $cdata = Contact::getPublicAndUserContactID($item['contact-id'], $item['uid']);
 455                 if (empty($cdata['user']) || ($item['author-id'] != $cdata['public'])) {
 456                         return false;
 457                 }
 458
 459                 // Check if the contact posted or shared something directly
 460                 if (DBA::exists('contact', ['id' => $item['contact-id'], 'notify_new_posts' => true])) {
 461                         return true;
 462                 }
 463
 464                 return false;
 465         }
 466
 467         /**
 468          * Check for an implicit mention (only in tags, not in body) of the given user
 469          *
 470          * @param array $item
 471          * @param array $profiles Profile links
 472          * @return bool The user is mentioned
 473          * @throws Exception
 474          */
 475         private static function checkImplicitMention(array $item, array $profiles): bool
 476         {
 477                 $mentions = Tag::getByURIId($item['uri-id'], [Tag::IMPLICIT_MENTION]);
 478                 foreach ($mentions as $mention) {
 479                         foreach ($profiles as $profile) {
 480                                 if (Strings::compareLink($profile, $mention['url'])) {
 481                                         return true;
 482                                 }
 483                         }
 484                 }
 485
 486                 return false;
 487         }
 488
 489         /**
 490          * Check for an explicit mention (tag and body) of the given user
 491          *
 492          * @param array $item
 493          * @param array $profiles Profile links
 494          * @return bool The user is mentioned
 495          * @throws Exception
 496          */
 497         private static function checkExplicitMention(array $item, array $profiles): bool
 498         {
 499                 $mentions = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
 500                 foreach ($mentions as $mention) {
 501                         foreach ($profiles as $profile) {
 502                                 if (Strings::compareLink($profile, $mention['url'])) {
 503                                         return true;
 504                                 }
 505                         }
 506                 }
 507
 508                 return false;
 509         }
 510
 511         /**
 512          * Check if the given user had created this thread
 513          *
 514          * @param array $item
 515          * @param array $contacts Array of contact IDs
 516          * @return bool The user had created this thread
 517          * @throws Exception
 518          */
 519         private static function checkCommentedThread(array $item, array $contacts): bool
 520         {
 521                 $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_PARENT];
 522                 return Post::exists($condition);
 523         }
 524
 525         /**
 526          * Check for a direct comment to a post of the given user
 527          *
 528          * @param array $item
 529          * @param array $contacts Array of contact IDs
 530          * @return bool The item is a direct comment to a user comment
 531          * @throws Exception
 532          */
 533         private static function checkDirectComment(array $item, array $contacts): bool
 534         {
 535                 $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_COMMENT];
 536                 return Post::exists($condition);
 537         }
 538
 539         /**
 540          * Check for a direct comment to the starting post of the given user
 541          *
 542          * @param array $item
 543          * @param array $contacts Array of contact IDs
 544          * @return bool The user had created this thread
 545          * @throws Exception
 546          */
 547         private static function checkDirectCommentedThread(array $item, array $contacts): bool
 548         {
 549                 $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_PARENT];
 550                 return Post::exists($condition);
 551         }
 552
 553         /**
 554          *  Check if the user had commented in this thread
 555          *
 556          * @param array $item
 557          * @param array $contacts Array of contact IDs
 558          * @return bool The user had commented in the thread
 559          * @throws Exception
 560          */
 561         private static function checkCommentedParticipation(array $item, array $contacts): bool
 562         {
 563                 $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_COMMENT];
 564                 return Post::exists($condition);
 565         }
 566
 567         /**
 568          * Check if the user follows this thread
 569          *
 570          * @param array $item
 571          * @param array $contacts Array of contact IDs
 572          * @return bool The user follows the thread
 573          * @throws Exception
 574          */
 575         private static function checkFollowParticipation(array $item, array $contacts): bool
 576         {
 577                 $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_ACTIVITY, 'verb' => Activity::FOLLOW];
 578                 return Post::exists($condition);
 579         }
 580
 581         /**
 582          * Check if the user had interacted in this thread (Like, Dislike, ...)
 583          *
 584          * @param array $item
 585          * @param array $contacts Array of contact IDs
 586          * @return bool The user had interacted in the thread
 587          * @throws Exception
 588          */
 589         private static function checkActivityParticipation(array $item, array $contacts): bool
 590         {
 591                 $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_ACTIVITY];
 592                 return Post::exists($condition);
 593         }
 594
 595         /**
 596          * Check for a quoted post of a post of the given user
 597          *
 598          * @param array $item
 599          * @param array $contacts Array of contact IDs
 600          * @return bool The item is a quoted post of a user's post or comment
 601          * @throws Exception
 602          */
 603         private static function checkQuoted(array $item, array $contacts): bool
 604         {
 605                 if (empty($item['quote-uri-id']) || ($item['quote-uri-id'] == $item['uri-id'])) {
 606                         return false;
 607                 }
 608                 $condition = ['uri-id' => $item['quote-uri-id'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => [item::GRAVITY_PARENT, Item::GRAVITY_COMMENT]];
 609                 return Post::exists($condition);
 610         }
 611
 612
 613 }