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[friendica.git] / src / Model / Post / UserNotification.php
index c8e31cdc03de541d6a9b1669ea8df77d61bdde10..dd0bbbe1ecf0249379cfe585cbe089311e7e0978 100644 (file)
@@ -1,6 +1,6 @@
 <?php
 /**
- * @copyright Copyright (C) 2010-2021, the Friendica project
+ * @copyright Copyright (C) 2010-2023, the Friendica project
  *
  * @license GNU AGPL version 3 or any later version
  *
 
 namespace Friendica\Model\Post;
 
-use \BadMethodCallException;
-use Friendica\Core\Logger;
+use BadMethodCallException;
+use Exception;
 use Friendica\Core\Hook;
+use Friendica\Core\Logger;
 use Friendica\Database\Database;
 use Friendica\Database\DBA;
-use Friendica\Database\DBStructure;
 use Friendica\DI;
 use Friendica\Model\Contact;
+use Friendica\Model\Item;
 use Friendica\Model\Post;
-use Friendica\Util\Strings;
+use Friendica\Model\Subscription;
 use Friendica\Model\Tag;
+use Friendica\Model\User;
+use Friendica\Network\HTTPException;
 use Friendica\Protocol\Activity;
-use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Strings;
 
 class UserNotification
 {
        // Notification types
-       const NOTIF_NONE = 0;
-       const NOTIF_EXPLICIT_TAGGED = 1;
-       const NOTIF_IMPLICIT_TAGGED = 2;
-       const NOTIF_THREAD_COMMENT = 4;
-       const NOTIF_DIRECT_COMMENT = 8;
-       const NOTIF_COMMENT_PARTICIPATION = 16;
-       const NOTIF_ACTIVITY_PARTICIPATION = 32;
-       const NOTIF_DIRECT_THREAD_COMMENT = 64;
-       const NOTIF_SHARED = 128;
-
+       const TYPE_NONE                   = 0;
+       const TYPE_EXPLICIT_TAGGED        = 1;
+       const TYPE_IMPLICIT_TAGGED        = 2;
+       const TYPE_THREAD_COMMENT         = 4;
+       const TYPE_DIRECT_COMMENT         = 8;
+       const TYPE_COMMENT_PARTICIPATION  = 16;
+       const TYPE_ACTIVITY_PARTICIPATION = 32;
+       const TYPE_DIRECT_THREAD_COMMENT  = 64;
+       const TYPE_SHARED                 = 128;
+       const TYPE_FOLLOW                 = 256;
+       const TYPE_QUOTED                 = 512;
 
        /**
         * Insert a new user notification entry
         *
         * @param integer $uri_id
         * @param integer $uid
-        * @param array   $fields
+        * @param array   $data
         * @return bool   success
-        * @throws \Exception
+        * @throws Exception
         */
-       public static function insert(int $uri_id, int $uid, array $data = [])
+       public static function insert(int $uri_id, int $uid, array $data = []): bool
        {
                if (empty($uri_id)) {
                        throw new BadMethodCallException('Empty URI_id');
                }
 
-               $fields = DBStructure::getFieldsForTable('post-user-notification', $data);
+               $fields = DI::dbaDefinition()->truncateFieldsForTable('post-user-notification', $data);
 
-               // Additionally assign the key fields
                $fields['uri-id'] = $uri_id;
-               $fields['uid'] = $uid;
+               $fields['uid']    = $uid;
 
                return DBA::insert('post-user-notification', $fields, Database::INSERT_IGNORE);
        }
@@ -81,15 +84,15 @@ class UserNotification
         * @param array   $data
         * @param bool    $insert_if_missing
         * @return bool
-        * @throws \Exception
+        * @throws Exception
         */
-       public static function update(int $uri_id, int $uid, array $data = [], bool $insert_if_missing = false)
+       public static function update(int $uri_id, int $uid, array $data = [], bool $insert_if_missing = false): bool
        {
                if (empty($uri_id)) {
                        throw new BadMethodCallException('Empty URI_id');
                }
 
-               $fields = DBStructure::getFieldsForTable('post-user-notification', $data);
+               $fields = DI::dbaDefinition()->truncateFieldsForTable('post-user-notification', $data);
 
                // Remove the key fields
                unset($fields['uri-id']);
@@ -105,36 +108,43 @@ class UserNotification
        /**
         * Delete a row from the post-user-notification table
         *
-        * @param array        $conditions Field condition(s)
-        * @param array        $options
-        *                           - cascade: If true we delete records in other tables that depend on the one we're deleting through
+        * @param array $conditions  Field condition(s)
+        * @param array $options     - cascade: If true we delete records in other tables that depend on the one we're deleting through
         *                           relations (default: true)
         *
-        * @return boolean was the delete successful?
-        * @throws \Exception
+        * @return boolean was the deletion successful?
+        * @throws Exception
         */
-       public static function delete(array $conditions, array $options = [])
+       public static function delete(array $conditions, array $options = []): bool
        {
                return DBA::delete('post-user-notification', $conditions, $options);
        }
 
        /**
         * Checks an item for notifications and sets the "notification-type" field
+        *
         * @ToDo:
         * - Check for mentions in posts with "uid=0" where the user hadn't interacted before
         *
         * @param int $uri_id URI ID
         * @param int $uid    user ID
+        * @throws Exception
         */
        public static function setNotification(int $uri_id, int $uid)
        {
                $fields = ['id', 'uri-id', 'parent-uri-id', 'uid', 'body', 'parent', 'gravity', 'vid', 'gravity',
-                       'private', 'contact-id', 'thr-parent', 'thr-parent-id', 'parent-uri-id', 'parent-uri', 'author-id', 'verb'];
-               $item = Post::selectFirst($fields, ['uri-id' => $uri_id, 'uid' => $uid, 'origin' => false]);
+                       'contact-id', 'author-id', 'owner-id', 'causer-id', 
+                       'private', 'thr-parent', 'thr-parent-id', 'parent-uri-id', 'parent-uri', 'verb'];
+               $item   = Post::selectFirst($fields, ['uri-id' => $uri_id, 'uid' => $uid, 'origin' => false]);
                if (!DBA::isResult($item)) {
                        return;
                }
 
+               $parent = Post::selectFirstPost(['author-id', 'owner-id', 'causer-id'], ['uri-id' => $item['parent-uri-id']]);
+               if (!DBA::isResult($parent)) {
+                       return;
+               }
+
                // "Activity::FOLLOW" is an automated activity, so we ignore it here
                if ($item['verb'] == Activity::FOLLOW) {
                        return;
@@ -157,28 +167,56 @@ class UserNotification
                DBA::close($users);
 
                foreach (array_unique($uids) as $uid) {
-                       self::setNotificationForUser($item, $uid);
+                       self::setNotificationForUser($item, $parent, $uid);
                }
        }
 
        /**
         * Checks an item for notifications for the given user and sets the "notification-type" field
         *
-        * @param array $item Item array
-        * @param int   $uid  User ID
+        * @param array $item   Item array
+        * @param array $parent Parent item array
+        * @param int   $uid    User ID
+        * @throws HTTPException\InternalServerErrorException
         */
-       private static function setNotificationForUser(array $item, int $uid)
+       private static function setNotificationForUser(array $item, array $parent, int $uid)
        {
                if (Post\ThreadUser::getIgnored($item['parent-uri-id'], $uid)) {
                        return;
                }
 
-               $notification_type = self::NOTIF_NONE;
+               foreach (array_unique([$parent['author-id'], $parent['owner-id'], $parent['causer-id'], $item['author-id'], $item['owner-id'], $item['causer-id']]) as $author_id) {
+                       if (empty($author_id)) {
+                               continue;
+                       }
+                       if (Contact\User::isBlocked($author_id, $uid) || Contact\User::isIgnored($author_id, $uid) || Contact\User::isCollapsed($author_id, $uid)) {
+                               Logger::debug('Author is blocked/ignored/collapsed by user', ['uid' => $uid, 'author' => $author_id, 'uri-id' => $item['uri-id']]);
+                               return;
+                       }
+               }
+
+               $user = User::getById($uid, ['account-type', 'account_removed', 'account_expired']);
+               if (in_array($user['account-type'], [User::ACCOUNT_TYPE_COMMUNITY, User::ACCOUNT_TYPE_RELAY])) {
+                       return;
+               }
+
+               if ($user['account_removed'] || $user['account_expired']) {
+                       return;
+               }
+
+               $author = Contact::getById($item['author-id'], ['contact-type']);
+               if (empty($author)) {
+                       return;
+               }
+
+               $notification_type = self::TYPE_NONE;
 
                if (self::checkShared($item, $uid)) {
-                       $notification_type = $notification_type | self::NOTIF_SHARED;
-                       self::insertNoticationByItem(self::NOTIF_SHARED, $uid, $item);
+                       $notification_type = $notification_type | self::TYPE_SHARED;
+                       self::insertNotificationByItem(self::TYPE_SHARED, $uid, $item);
                        $notified = true;
+               } elseif ($author['contact-type'] == Contact::TYPE_COMMUNITY) {
+                       return;
                } else {
                        $notified = false;
                }
@@ -186,10 +224,16 @@ class UserNotification
                $profiles = self::getProfileForUser($uid);
 
                // Fetch all contacts for the given profiles
-               $contacts = [];
-               $ret = DBA::select('contact', ['id'], ['uid' => 0, 'nurl' => $profiles]);
+               $contacts    = [];
+               $iscommunity = false;
+
+               $ret = DBA::select('contact', ['id', 'contact-type'], ['uid' => 0, 'nurl' => $profiles]);
                while ($contact = DBA::fetch($ret)) {
                        $contacts[] = $contact['id'];
+
+                       if ($contact['contact-type'] == Contact::TYPE_COMMUNITY) {
+                               $iscommunity = true;
+                       }
                }
                DBA::close($ret);
 
@@ -198,64 +242,83 @@ class UserNotification
                        return;
                }
 
-               if (self::checkExplicitMention($item, $profiles)) {
-                       $notification_type = $notification_type | self::NOTIF_EXPLICIT_TAGGED;
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkExplicitMention($item, $profiles)) {
+                       $notification_type = $notification_type | self::TYPE_EXPLICIT_TAGGED;
                        if (!$notified) {
-                               self::insertNoticationByItem( self::NOTIF_EXPLICIT_TAGGED, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_EXPLICIT_TAGGED, $uid, $item);
                                $notified = true;
                        }
                }
 
-               if (self::checkImplicitMention($item, $profiles)) {
-                       $notification_type = $notification_type | self::NOTIF_IMPLICIT_TAGGED;
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkImplicitMention($item, $profiles)) {
+                       $notification_type = $notification_type | self::TYPE_IMPLICIT_TAGGED;
                        if (!$notified) {
-                               self::insertNoticationByItem(self::NOTIF_IMPLICIT_TAGGED, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_IMPLICIT_TAGGED, $uid, $item);
                                $notified = true;
                        }
                }
 
                if (self::checkDirectComment($item, $contacts)) {
-                       $notification_type = $notification_type | self::NOTIF_DIRECT_COMMENT;
+                       $notification_type = $notification_type | self::TYPE_DIRECT_COMMENT;
+                       if (!$notified) {
+                               self::insertNotificationByItem(self::TYPE_DIRECT_COMMENT, $uid, $item);
+                               $notified = true;
+                       }
+               }
+
+               if (!$iscommunity && self::checkDirectCommentedThread($item, $contacts)) {
+                       $notification_type = $notification_type | self::TYPE_DIRECT_THREAD_COMMENT;
                        if (!$notified) {
-                               self::insertNoticationByItem(self::NOTIF_DIRECT_COMMENT, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_DIRECT_THREAD_COMMENT, $uid, $item);
                                $notified = true;
                        }
                }
 
-               if (self::checkDirectCommentedThread($item, $contacts)) {
-                       $notification_type = $notification_type | self::NOTIF_DIRECT_THREAD_COMMENT;
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkCommentedThread($item, $contacts)) {
+                       $notification_type = $notification_type | self::TYPE_THREAD_COMMENT;
                        if (!$notified) {
-                               self::insertNoticationByItem(self::NOTIF_DIRECT_THREAD_COMMENT, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_THREAD_COMMENT, $uid, $item);
                                $notified = true;
                        }
                }
 
-               if (self::checkCommentedThread($item, $contacts)) {
-                       $notification_type = $notification_type | self::NOTIF_THREAD_COMMENT;
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkCommentedParticipation($item, $contacts)) {
+                       $notification_type = $notification_type | self::TYPE_COMMENT_PARTICIPATION;
                        if (!$notified) {
-                               self::insertNoticationByItem(self::NOTIF_THREAD_COMMENT, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_COMMENT_PARTICIPATION, $uid, $item);
                                $notified = true;
                        }
                }
 
-               if (self::checkCommentedParticipation($item, $contacts)) {
-                       $notification_type = $notification_type | self::NOTIF_COMMENT_PARTICIPATION;
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkQuoted($item, $contacts)) {
+                       $notification_type = $notification_type | self::TYPE_QUOTED;
                        if (!$notified) {
-                               self::insertNoticationByItem(self::NOTIF_COMMENT_PARTICIPATION, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_QUOTED, $uid, $item);
                                $notified = true;
                        }
                }
 
-               if (self::checkActivityParticipation($item, $contacts)) {
-                       $notification_type = $notification_type | self::NOTIF_ACTIVITY_PARTICIPATION;
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkFollowParticipation($item, $contacts)) {
+                       $notification_type = $notification_type | self::TYPE_FOLLOW;
                        if (!$notified) {
-                               self::insertNoticationByItem(self::NOTIF_ACTIVITY_PARTICIPATION, $uid, $item);
+                               self::insertNotificationByItem(self::TYPE_FOLLOW, $uid, $item);
                                $notified = true;
                        }
                }
 
+               if (($item['verb'] != Activity::ANNOUNCE) && self::checkActivityParticipation($item, $contacts)) {
+                       $notification_type = $notification_type | self::TYPE_ACTIVITY_PARTICIPATION;
+                       if (!$notified) {
+                               self::insertNotificationByItem(self::TYPE_ACTIVITY_PARTICIPATION, $uid, $item);
+                       }
+               }
+
+               if (empty($notification_type)) {
+                       return;
+               }
+
                // Only create notifications for posts and comments, not for activities
-               if (empty($notification_type) || !in_array($item['gravity'], [GRAVITY_PARENT, GRAVITY_COMMENT])) {
+               if (($item['gravity'] == Item::GRAVITY_ACTIVITY) && ($item['verb'] != Activity::ANNOUNCE)) {
                        return;
                }
 
@@ -269,65 +332,71 @@ class UserNotification
        /**
         * Add a notification entry for a given item array
         *
-        * @param int $type   User notification type
-        * @param int $uid    User ID
+        * @param int   $type User notification type
+        * @param int   $uid  User ID
         * @param array $item Item array
-        * @return boolean
+        * @return void
+        * @throws Exception
         */
-       private static function insertNoticationByItem(int $type, int $uid, array $item)
+       private static function insertNotificationByItem(int $type, int $uid, array $item): void
        {
-               if (($item['gravity'] == GRAVITY_ACTIVITY) &&
-                       !in_array($type, [self::NOTIF_DIRECT_COMMENT, self::NOTIF_DIRECT_THREAD_COMMENT])) {
+               if (($item['verb'] != Activity::ANNOUNCE) && ($item['gravity'] == Item::GRAVITY_ACTIVITY) &&
+                       !in_array($type, [self::TYPE_DIRECT_COMMENT, self::TYPE_DIRECT_THREAD_COMMENT])) {
                        // Activities are only stored when performed on the user's post or comment
                        return;
                }
 
-               $fields = [
-                       'uid' => $uid,
-                       'vid' => $item['vid'],
-                       'type' => $type,
-                       'actor-id' => $item['author-id'],
-                       'parent-uri-id' => $item['parent-uri-id'],
-                       'created' => DateTimeFormat::utcNow(),
-               ];
+               $notification = DI::notificationFactory()->createForUser(
+                       $uid,
+                       $item['vid'],
+                       $type,
+                       $item['author-id'],
+                       $item['gravity'] == Item::GRAVITY_ACTIVITY ? $item['thr-parent-id'] : $item['uri-id'],
+                       $item['parent-uri-id']
+               );
 
-               if ($item['gravity'] == GRAVITY_ACTIVITY) {
-                       $fields['target-uri-id'] = $item['thr-parent-id'];
-               } else {
-                       $fields['target-uri-id'] = $item['uri-id'];
-               }
+               try {
+                       $notification = DI::notification()->save($notification);
+                       Subscription::pushByNotification($notification);
+               } catch (Exception $e) {
 
-               return DBA::insert('notification', $fields);
+               }
        }
 
        /**
         * Add a notification entry
         *
-        * @param int $actor Contact ID of the actor
-        * @param int $vid   Verb ID
-        * @param int $uid   User ID
+        * @param int    $actor Public contact ID of the actor
+        * @param string $verb  One of the Activity verb constant values
+        * @param int    $uid   User ID
         * @return boolean
+        * @throws Exception
         */
-       public static function insertNotication(int $actor, int $vid, int $uid)
+       public static function insertNotification(int $actor, string $verb, int $uid): bool
        {
-               $fields = [
-                       'uid' => $uid,
-                       'vid' => $vid,
-                       'type' => self::NOTIF_NONE,
-                       'actor-id' => $actor,
-                       'created' => DateTimeFormat::utcNow(),
-               ];
-
-               return DBA::insert('notification', $fields);
+               $notification = DI::notificationFactory()->createForRelationship(
+                       $uid,
+                       $actor,
+                       $verb
+               );
+               try {
+                       $notification = DI::notification()->save($notification);
+                       Subscription::pushByNotification($notification);
+                       return true;
+               } catch (Exception $e) {
+                       return false;
+               }
        }
 
        /**
         * Fetch all profiles (contact URL) of a given user
+        *
         * @param int $uid User ID
         *
         * @return array Profile links
+        * @throws HTTPException\InternalServerErrorException
         */
-       private static function getProfileForUser(int $uid)
+       private static function getProfileForUser(int $uid): array
        {
                $notification_data = ['uid' => $uid, 'profiles' => []];
                Hook::callAll('check_item_notification', $notification_data);
@@ -350,11 +419,11 @@ class UserNotification
                // Now the alias
                $profiles[] = $owner['alias'];
 
-               // Notifications from Diaspora are often with an URL in the Diaspora format
+               // Notifications from Diaspora often have a URL in the Diaspora format
                $profiles[] = DI::baseUrl() . '/u/' . $user['nickname'];
 
                // Validate and add profile links
-               foreach ($profiles AS $key => $profile) {
+               foreach ($profiles as $key => $profile) {
                        // Check for invalid profile urls (without scheme, host or path) and remove them
                        if (empty(parse_url($profile, PHP_URL_SCHEME)) || empty(parse_url($profile, PHP_URL_HOST)) || empty(parse_url($profile, PHP_URL_PATH))) {
                                unset($profiles[$key]);
@@ -362,11 +431,11 @@ class UserNotification
                        }
 
                        // Add the normalized form
-                       $profile = Strings::normaliseLink($profile);
+                       $profile    = Strings::normaliseLink($profile);
                        $profiles[] = $profile;
 
                        // Add the SSL form
-                       $profile = str_replace('http://', 'https://', $profile);
+                       $profile    = str_replace('http://', 'https://', $profile);
                        $profiles[] = $profile;
                }
 
@@ -375,47 +444,50 @@ class UserNotification
 
        /**
         * Check for a "shared" notification for every new post of contacts from the given user
+        *
         * @param array $item
-        * @param int   $uid  User ID
+        * @param int   $uid User ID
         * @return bool A contact had shared something
+        * @throws Exception
         */
-       private static function checkShared(array $item, int $uid)
+       private static function checkShared(array $item, int $uid): bool
        {
                // Only check on original posts and reshare ("announce") activities, otherwise return
-               if (($item['gravity'] != GRAVITY_PARENT) && ($item['verb'] != Activity::ANNOUNCE)) {
+               if (($item['gravity'] != Item::GRAVITY_PARENT) && ($item['verb'] != Activity::ANNOUNCE)) {
                        return false;
                }
 
-               // Check if the contact posted or shared something directly
-               if (DBA::exists('contact', ['id' => $item['contact-id'], 'notify_new_posts' => true])) {
-                       return true;
+               // Don't notify about reshares by communities of our own posts or each time someone comments
+               if (($item['verb'] == Activity::ANNOUNCE) && DBA::exists('contact', ['id' => $item['contact-id'], 'contact-type' => Contact::TYPE_COMMUNITY])) {
+                       $post = Post::selectFirst(['origin', 'gravity'], ['uri-id' => $item['thr-parent-id'], 'uid' => $uid]);
+                       if (!$post || $post['origin'] || ($post['gravity'] != Item::GRAVITY_PARENT)) {
+                               return false;
+                       }
                }
 
-               // The following check doesn't make sense on activities, so quit here
-               if ($item['verb'] == Activity::ANNOUNCE) {
+               // Only check on posts by the user itself
+               $cdata = Contact::getPublicAndUserContactID($item['contact-id'], $item['uid']);
+               if (empty($cdata['user']) || ($item['author-id'] != $cdata['public'])) {
                        return false;
                }
 
-               // Check if the contact is a mentioned forum
-               $tags = DBA::select('tag-view', ['url'], ['uri-id' => $item['uri-id'], 'type' => [Tag::MENTION, Tag::EXCLUSIVE_MENTION]]);
-               while ($tag = DBA::fetch($tags)) {
-                       $condition = ['nurl' => Strings::normaliseLink($tag['url']), 'uid' => $uid, 'notify_new_posts' => true, 'contact-type' => Contact::TYPE_COMMUNITY];
-                       if (DBA::exists('contact', $condition)) {
-                               return true;
-                       }
+               // Check if the contact posted or shared something directly
+               if (DBA::exists('contact', ['id' => $item['contact-id'], 'notify_new_posts' => true])) {
+                       return true;
                }
-               DBA::close($tags);
 
                return false;
        }
 
        /**
-        * Check for an implicit mention (only tag, no body) of the given user
+        * Check for an implicit mention (only in tags, not in body) of the given user
+        *
         * @param array $item
         * @param array $profiles Profile links
         * @return bool The user is mentioned
+        * @throws Exception
         */
-       private static function checkImplicitMention(array $item, array $profiles)
+       private static function checkImplicitMention(array $item, array $profiles): bool
        {
                $mentions = Tag::getByURIId($item['uri-id'], [Tag::IMPLICIT_MENTION]);
                foreach ($mentions as $mention) {
@@ -431,11 +503,13 @@ class UserNotification
 
        /**
         * Check for an explicit mention (tag and body) of the given user
+        *
         * @param array $item
         * @param array $profiles Profile links
         * @return bool The user is mentioned
+        * @throws Exception
         */
-       private static function checkExplicitMention(array $item, array $profiles)
+       private static function checkExplicitMention(array $item, array $profiles): bool
        {
                $mentions = Tag::getByURIId($item['uri-id'], [Tag::MENTION, Tag::EXCLUSIVE_MENTION]);
                foreach ($mentions as $mention) {
@@ -451,61 +525,104 @@ class UserNotification
 
        /**
         * Check if the given user had created this thread
+        *
         * @param array $item
         * @param array $contacts Array of contact IDs
         * @return bool The user had created this thread
+        * @throws Exception
         */
-       private static function checkCommentedThread(array $item, array $contacts)
+       private static function checkCommentedThread(array $item, array $contacts): bool
        {
-               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => GRAVITY_PARENT];
+               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_PARENT];
                return Post::exists($condition);
        }
 
        /**
         * Check for a direct comment to a post of the given user
+        *
         * @param array $item
         * @param array $contacts Array of contact IDs
         * @return bool The item is a direct comment to a user comment
+        * @throws Exception
         */
-       private static function checkDirectComment(array $item, array $contacts)
+       private static function checkDirectComment(array $item, array $contacts): bool
        {
-               $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => GRAVITY_COMMENT];
+               $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_COMMENT];
                return Post::exists($condition);
        }
 
        /**
         * Check for a direct comment to the starting post of the given user
+        *
         * @param array $item
         * @param array $contacts Array of contact IDs
         * @return bool The user had created this thread
+        * @throws Exception
         */
-       private static function checkDirectCommentedThread(array $item, array $contacts)
+       private static function checkDirectCommentedThread(array $item, array $contacts): bool
        {
-               $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => GRAVITY_PARENT];
+               $condition = ['uri' => $item['thr-parent'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_PARENT];
                return Post::exists($condition);
        }
 
        /**
         *  Check if the user had commented in this thread
+        *
         * @param array $item
         * @param array $contacts Array of contact IDs
         * @return bool The user had commented in the thread
+        * @throws Exception
         */
-       private static function checkCommentedParticipation(array $item, array $contacts)
+       private static function checkCommentedParticipation(array $item, array $contacts): bool
        {
-               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => GRAVITY_COMMENT];
+               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_COMMENT];
+               return Post::exists($condition);
+       }
+
+       /**
+        * Check if the user follows this thread
+        *
+        * @param array $item
+        * @param array $contacts Array of contact IDs
+        * @return bool The user follows the thread
+        * @throws Exception
+        */
+       private static function checkFollowParticipation(array $item, array $contacts): bool
+       {
+               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_ACTIVITY, 'verb' => Activity::FOLLOW];
                return Post::exists($condition);
        }
 
        /**
         * Check if the user had interacted in this thread (Like, Dislike, ...)
+        *
         * @param array $item
         * @param array $contacts Array of contact IDs
         * @return bool The user had interacted in the thread
+        * @throws Exception
+        */
+       private static function checkActivityParticipation(array $item, array $contacts): bool
+       {
+               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => Item::GRAVITY_ACTIVITY];
+               return Post::exists($condition);
+       }
+
+       /**
+        * Check for a quoted post of a post of the given user
+        *
+        * @param array $item
+        * @param array $contacts Array of contact IDs
+        * @return bool The item is a quoted post of a user's post or comment
+        * @throws Exception
         */
-       private static function checkActivityParticipation(array $item, array $contacts)
+       private static function checkQuoted(array $item, array $contacts): bool
        {
-               $condition = ['parent' => $item['parent'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => GRAVITY_ACTIVITY];
+               if (empty($item['quote-uri-id'])) {
+                       return false;
+               }
+               $condition = ['uri-id' => $item['quote-uri-id'], 'uid' => $item['uid'], 'author-id' => $contacts, 'deleted' => false, 'gravity' => [item::GRAVITY_PARENT, Item::GRAVITY_COMMENT]];
                return Post::exists($condition);
        }
+
+
 }