class.ilChatroom.php

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<?php
 
declare(strict_types=1);
 
use ILIAS\Notifications\Identification\NotificationIdentification;
use ILIAS\Notifications\Model\ilNotificationConfig;
use ILIAS\Notifications\Model\ilNotificationLink;
use ILIAS\Notifications\Model\ilNotificationParameter;
use ILIAS\Chatroom\GlobalScreen\ChatInvitationNotificationProvider;
 
class ilChatroom
{
    public const ROOM_INVITATION = 'invitation_to_room';
    private static string $settingsTable = 'chatroom_settings';
    private static string $historyTable = 'chatroom_history';
    private static string $userTable = 'chatroom_users';
    private static string $sessionTable = 'chatroom_sessions';
    private static string $banTable = 'chatroom_bans';
    private static string $privateRoomsTable = 'chatroom_prooms';
    private static string $privateSessionsTable = 'chatroom_psessions';
    private static string $uploadTable = 'chatroom_uploads';
    private static string $privateRoomsAccessTable = 'chatroom_proomaccess';
    private array $settings = [];
    private array $availableSettings = [
        'object_id' => 'integer',
        'online_status' => 'boolean',
        'allow_anonymous' => 'boolean',
        'allow_custom_usernames' => 'boolean',
        'enable_history' => 'boolean',
        'restrict_history' => 'boolean',
        'autogen_usernames' => 'string',
        'room_type' => 'string',
        'allow_private_rooms' => 'boolean',
        'display_past_msgs' => 'integer',
        'private_rooms_enabled' => 'boolean'
    ];
    private int $roomId = 0;
    private ?ilObjChatroom $object = null;
 
    public static function checkUserPermissions($permissions, int $ref_id, bool $send_info = true): bool
    {
        global $DIC;
        $main_tpl = $DIC->ui()->mainTemplate();
 
        if (!is_array($permissions)) {
            $permissions = [$permissions];
        }
 
        $hasPermissions = self::checkPermissions($DIC->user()->getId(), $ref_id, $permissions);
        if (!$hasPermissions && $send_info) {
            $main_tpl->setOnScreenMessage('failure', $DIC->language()->txt('permission_denied'), true);
 
            return false;
        }
 
        return $hasPermissions;
    }
 
    public static function checkPermissionsOfUser(int $usr_id, $permissions, int $ref_id): bool
    {
        if (!is_array($permissions)) {
            $permissions = [$permissions];
        }
 
        return self::checkPermissions($usr_id, $ref_id, $permissions);
    }
 
    protected static function checkPermissions(int $usrId, int $refId, array $permissions): bool
    {
        global $DIC;
 
        $pub_ref_id = ilObjChatroom::_getPublicRefId();
 
        foreach ($permissions as $permission) {
            if ($pub_ref_id === $refId) {
                $hasAccess = $DIC->rbac()->system()->checkAccessOfUser($usrId, $permission, $refId);
                if ($hasAccess) {
                    $hasWritePermission = $DIC->rbac()->system()->checkAccessOfUser($usrId, 'write', $refId);
                    if ($hasWritePermission) {
                        continue;
                    }
 
                    $visible = null;
                    $a_obj_id = ilObject::_lookupObjId($refId);
                    $active = ilObjChatroomAccess::isActivated($refId, $a_obj_id, $visible);
 
                    switch ($permission) {
                        case 'visible':
                            if (!$active) {
                                $DIC->access()->addInfoItem(
                                    ilAccessInfo::IL_NO_OBJECT_ACCESS,
                                    $DIC->language()->txt('offline')
                                );
                            }
 
                            if (!$active && !$visible) {
                                return false;
                            }
                            break;
 
                        case 'read':
                            if (!$active) {
                                $DIC->access()->addInfoItem(
                                    ilAccessInfo::IL_NO_OBJECT_ACCESS,
                                    $DIC->language()->txt('offline')
                                );
                                return false;
                            }
                            break;
                    }
                }
            } else {
                $hasAccess = $DIC->access()->checkAccessOfUser($usrId, $permission, '', $refId);
            }
 
            if (!$hasAccess) {
                return false;
            }
        }
 
        return true;
    }
 
    public static function byObjectId(int $object_id): ?ilChatroom
    {
        global $DIC;
 
        $query = 'SELECT * FROM ' . self::$settingsTable . ' WHERE object_id = %s';
        $types = ['integer'];
        $values = [$object_id];
        $rset = $DIC->database()->queryF($query, $types, $values);
 
        if ($row = $DIC->database()->fetchAssoc($rset)) {
            $room = new self();
            $room->initialize($row);
            return $room;
        }
 
        return null;
    }
 
    public function initialize(array $rowdata): void
    {
        $this->roomId = (int) $rowdata['room_id'];
 
        foreach ($this->availableSettings as $setting => $type) {
            if (isset($rowdata[$setting])) {
                settype($rowdata[$setting], $this->availableSettings[$setting]);
                $this->setSetting($setting, $rowdata[$setting]);
            }
        }
    }
 
    public function setSetting(string $name, $value): void
    {
        $this->settings[$name] = $value;
    }
 
    public static function byRoomId(int $room_id, bool $initObject = false): ?ilChatroom
    {
        global $DIC;
 
        $query = 'SELECT * FROM ' . self::$settingsTable . ' WHERE room_id = %s';
 
        $types = ['integer'];
        $values = [$room_id];
 
        $rset = $DIC->database()->queryF($query, $types, $values);
 
        if ($row = $DIC->database()->fetchAssoc($rset)) {
            $room = new self();
            $room->initialize($row);
 
            if ($initObject) {
                $room->object = ilObjectFactory::getInstanceByObjId((int) $row['object_id']);
            }
 
            return $room;
        }
 
        return null;
    }
 
    public static function findDeletablePrivateRooms(): array
    {
        global $DIC;
 
        $query = '
                        SELECT private_rooms.proom_id id, MIN(disconnected) min_disconnected, MAX(disconnected) max_disconnected
                        FROM ' . self::$privateSessionsTable . ' private_sessions
                        INNER JOIN ' . self::$privateRoomsTable . ' private_rooms
                                ON private_sessions.proom_id = private_rooms.proom_id
                        WHERE closed = 0
                        GROUP BY private_rooms.proom_id
                        HAVING MIN(disconnected) > 0 AND MAX(disconnected) < %s';
        $rset = $DIC->database()->queryF(
            $query,
            ['integer'],
            [time() + 60 * 5]
        );
 
        $rooms = [];
 
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $rooms[$row['id']] = $row['id'];
        }
 
        $query = 'SELECT DISTINCT proom_id, room_id, object_id FROM ' . self::$privateRoomsTable
            . ' INNER JOIN ' . self::$settingsTable . ' ON parent_id = room_id '
            . ' WHERE ' . $DIC->database()->in('proom_id', $rooms, false, 'integer');
 
        $rset = $DIC->database()->query($query);
        $rooms = [];
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $rooms[] = [
                'proom_id' => (int) $row['proom_id'],
                'room_id' => (int) $row['room_id'],
                'object_id' => (int) $row['object_id']
            ];
        }
 
        return $rooms;
    }
 
    public function getDescription(): string
    {
        if (!$this->object) {
            $this->object = ilObjectFactory::getInstanceByObjId((int) $this->getSetting('object_id'));
        }
 
        return $this->object->getDescription();
    }
 
    public function getSetting(string $name)
    {
        return $this->settings[$name];
    }
 
    public function save(): void
    {
        $this->saveSettings($this->settings);
    }
 
    public function saveSettings(array $settings): void
    {
        global $DIC;
 
        $localSettings = [];
 
        foreach ($this->availableSettings as $setting => $type) {
            if (isset($settings[$setting])) {
                if ($type === 'boolean') {
                    $settings[$setting] = (bool) $settings[$setting];
                }
                $localSettings[$setting] = [$this->phpTypeToMDBType($type), $settings[$setting]];
            }
        }
 
        if (!isset($localSettings['room_type']) || !$localSettings['room_type'][1]) {
            $localSettings['room_type'][0] = 'text';
            $localSettings['room_type'][1] = 'repository';
        }
 
        if ($this->roomId > 0) {
            $DIC->database()->update(
                self::$settingsTable,
                $localSettings,
                ['room_id' => ['integer', $this->roomId]]
            );
        } else {
            $this->roomId = $DIC->database()->nextId(self::$settingsTable);
 
            $localSettings['room_id'] = [
                'integer', $this->roomId
            ];
 
            $DIC->database()->insert(self::$settingsTable, $localSettings);
        }
    }
 
    private function phpTypeToMDBType(string $type): string
    {
        switch ($type) {
            case 'string':
                return 'text';
 
            case 'boolean':
                return 'integer';
 
            default:
                return $type;
        }
    }
 
    public function addHistoryEntry($message): void
    {
        global $DIC;
 
        $subRoom = 0;
        $timestamp = 0;
        if (is_array($message)) {
            $subRoom = (int) ($message['sub'] ?? 0);
            $timestamp = (int) $message['timestamp'];
        } elseif (is_object($message)) {
            $subRoom = (int) $message->sub;
            $timestamp = (int) $message->timestamp;
        }
 
        $id = $DIC->database()->nextId(self::$historyTable);
        $DIC->database()->insert(
            self::$historyTable,
            [
                'hist_id' => ['integer', $id],
                'room_id' => ['integer', $this->roomId],
                'sub_room' => ['integer', $subRoom],
                'message' => ['text', json_encode($message, JSON_THROW_ON_ERROR)],
                'timestamp' => ['integer', ($timestamp > 0 ? $timestamp : time())],
            ]
        );
    }
 
    public function connectUser(ilChatroomUser $user): bool
    {
        global $DIC;
 
        $userdata = [
            'login' => $user->getUsername(),
            'id' => $user->getUserId()
        ];
 
        $query = 'SELECT user_id FROM ' . self::$userTable . ' WHERE room_id = %s AND user_id = %s';
        $types = ['integer', 'integer'];
        $values = [$this->roomId, $user->getUserId()];
 
        if (!$DIC->database()->fetchAssoc($DIC->database()->queryF($query, $types, $values))) {
            // Notice: Using replace instead of insert looks strange, because we actually know whether the selected data exists or not
            // But we occasionally found some duplicate key errors although the data set should not exist when the following code is reached
            $DIC->database()->replace(
                self::$userTable,
                [
                    'room_id' => ['integer', $this->roomId],
                    'user_id' => ['integer', $user->getUserId()]
                ],
                [
                    'userdata' => ['text', json_encode($userdata, JSON_THROW_ON_ERROR)],
                    'connected' => ['integer', time()],
                ]
            );
 
            return true;
        }
 
        return false;
    }
 
    public function getConnectedUsers(bool $only_data = true): array
    {
        global $DIC;
 
        $query = 'SELECT ' . ($only_data ? 'userdata' : '*') . ' FROM ' . self::$userTable . ' WHERE room_id = %s';
        $types = ['integer'];
        $values = [$this->roomId];
        $rset = $DIC->database()->queryF($query, $types, $values);
        $users = [];
 
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $users[] = $only_data ? json_decode($row['userdata'], false, 512, JSON_THROW_ON_ERROR) : $row;
        }
 
        return $users;
    }
 
    public function disconnectUser(int $user_id): void
    {
        $this->disconnectUsers([$user_id]);
    }
 
    public function disconnectUsers(array $userIds): void
    {
        global $DIC;
 
        $query = 'SELECT * FROM ' . self::$userTable . ' WHERE room_id = %s AND ' .
            $DIC->database()->in('user_id', $userIds, false, 'integer');
 
        $types = ['integer'];
        $values = [$this->roomId];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        if ($row = $DIC->database()->fetchAssoc($res)) {
            $query = 'SELECT proom_id FROM ' . self::$privateRoomsTable . ' WHERE parent_id = %s';
            $rset_prooms = $DIC->database()->queryF($query, ['integer'], [$this->roomId]);
 
            $prooms = [];
 
            while ($row_prooms = $DIC->database()->fetchAssoc($rset_prooms)) {
                $prooms[] = $row_prooms['proom_id'];
            }
 
            $query = 'UPDATE ' . self::$privateSessionsTable . ' SET disconnected = %s WHERE ' .
                $DIC->database()->in('user_id', $userIds, false, 'integer') .
                ' AND ' . $DIC->database()->in('proom_id', $prooms, false, 'integer');
            $DIC->database()->manipulateF($query, ['integer'], [time()]);
 
            $query = 'DELETE FROM ' . self::$userTable . ' WHERE room_id = %s AND ' .
                $DIC->database()->in('user_id', $userIds, false, 'integer');
 
            $types = ['integer'];
            $values = [$this->roomId];
            $DIC->database()->manipulateF($query, $types, $values);
 
            do {
                if ($this->getSetting('enable_history')) {
                    $id = $DIC->database()->nextId(self::$sessionTable);
                    $DIC->database()->insert(
                        self::$sessionTable,
                        [
                            'sess_id' => ['integer', $id],
                            'room_id' => ['integer', $this->roomId],
                            'user_id' => ['integer', $row['user_id']],
                            'userdata' => ['text', $row['userdata']],
                            'connected' => ['integer', $row['connected']],
                            'disconnected' => ['integer', time()]
                        ]
                    );
                }
            } while ($row = $DIC->database()->fetchAssoc($res));
        }
    }
 
    public function getSettings(): array
    {
        return $this->settings;
    }
 
    public function isSubscribed(int $chat_userid): bool
    {
        global $DIC;
 
        $query = 'SELECT COUNT(user_id) as cnt FROM ' . self::$userTable .
            ' WHERE room_id = %s AND user_id = %s';
 
        $types = ['integer', 'integer'];
        $values = [$this->roomId, $chat_userid];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        return ($row = $DIC->database()->fetchAssoc($res)) && (int) $row['cnt'] === 1;
    }
 
    public function isAllowedToEnterPrivateRoom(int $chat_userid, int $proom_id): bool
    {
        global $DIC;
 
        $query = 'SELECT COUNT(user_id) cnt FROM ' . self::$privateRoomsAccessTable .
            ' WHERE proom_id = %s AND user_id = %s';
 
        $types = ['integer', 'integer'];
        $values = [$proom_id, $chat_userid];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        if (($row = $DIC->database()->fetchAssoc($res)) && (int) $row['cnt'] === 1) {
            return true;
        }
 
        $query = 'SELECT COUNT(*) cnt FROM ' . self::$privateRoomsTable .
            ' WHERE proom_id = %s AND owner = %s';
 
        $types = ['integer', 'integer'];
        $values = [$proom_id, $chat_userid];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        return ($row = $DIC->database()->fetchAssoc($res)) && (int) $row['cnt'] === 1;
    }
 
    public function getHistory(
        ilDateTime $from = null,
        ilDateTime $to = null,
        int $restricted_session_userid = null,
        ?int $proom_id = 0,
        bool $respect_target = true
    ): array {
        global $DIC;
 
        $join = '';
 
        if ($proom_id) {
            $join .=
                'INNER JOIN ' . self::$privateSessionsTable . ' pSessionTable ' .
                'ON pSessionTable.user_id = ' . $DIC->database()->quote($restricted_session_userid, 'integer') . ' ' .
                'AND pSessionTable.proom_id = historyTable.sub_room ' .
                'AND timestamp >= pSessionTable.connected ' .
                'AND timestamp <= pSessionTable.disconnected ';
        }
 
        $query =
            'SELECT historyTable.* ' .
            'FROM ' . self::$historyTable . ' historyTable ' . $join . ' ' .
            'WHERE historyTable.room_id = ' . $this->getRoomId();
 
        if ($proom_id !== null) {
            $query .= ' AND historyTable.sub_room = ' . $DIC->database()->quote($proom_id, 'integer');
        }
 
        $filter = [];
 
        if ($from !== null) {
            $filter[] = 'timestamp >= ' . $DIC->database()->quote($from->getUnixTime(), 'integer');
        }
 
        if ($to !== null) {
            $filter[] = 'timestamp <= ' . $DIC->database()->quote($to->getUnixTime(), 'integer');
        }
 
        if ($filter) {
            $query .= ' AND ' . implode(' AND ', $filter);
        }
        $query .= ' ORDER BY timestamp ASC';
 
        $rset = $DIC->database()->query($query);
        $result = [];
 
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            try {
                $message = json_decode($row['message'], false, 512, JSON_THROW_ON_ERROR);
            } catch (JsonException $e) {
                $message = null;
            } finally {
                if ($message === null) {
                    $message = json_decode('{}', false, 512, JSON_THROW_ON_ERROR);
                }
            }
 
            $row['message'] = $message;
            $row['message']->timestamp = $row['timestamp'];
            if (
                $respect_target &&
                property_exists($row['message'], 'target') &&
                $row['message']->target !== null &&
                !$row['message']->target->public && (
                    !isset($row['recipients']) ||
                    !in_array($DIC->user()->getId(), explode(',', $row['recipients']), false)
                )
            ) {
                continue;
            }
 
            $result[] = $row;
        }
        return $result;
    }
 
    public function getRoomId(): int
    {
        return $this->roomId;
    }
 
    public function getPrivateRoomSessions(
        ilDateTime $from,
        ilDateTime $to,
        int $user_id,
        int $room_id
    ): array {
        global $DIC;
 
        $query = 'SELECT proom_id, title FROM ' . self::$privateRoomsTable . ' WHERE proom_id IN (
            SELECT proom_id FROM ' . self::$privateSessionsTable . ' WHERE connected >= %s AND disconnected <= %s AND user_id = %s
        ) AND parent_id = %s';
 
        $res = $DIC->database()->queryF(
            $query,
            ['integer', 'integer', 'integer', 'integer'],
            [$from->getUnixTime(), $to->getUnixTime(), $user_id, $room_id]
        );
        $result = [];
        while ($row = $DIC->database()->fetchAssoc($res)) {
            $result[] = $row;
        }
 
        return $result;
    }
 
    public function saveFileUploadToDb(int $user_id, string $filename, string $type): void
    {
        global $DIC;
 
        $upload_id = $DIC->database()->nextId(self::$uploadTable);
        $DIC->database()->insert(
            self::$uploadTable,
            [
                'upload_id' => ['integer', $upload_id],
                'room_id' => ['integer', $this->roomId],
                'user_id' => ['integer', $user_id],
                'filename' => ['text', $filename],
                'filetype' => ['text', $type],
                'timestamp' => ['integer', time()]
            ]
        );
    }
 
    public function banUser(int $user_id, int $actor_id, string $comment = ''): void
    {
        global $DIC;
 
        $DIC->database()->replace(
            self::$banTable,
            [
                'room_id' => ['integer', $this->roomId],
                'user_id' => ['integer', $user_id]
            ],
            [
                'actor_id' => ['integer', $actor_id],
                'timestamp' => ['integer', time()],
                'remark' => ['text', $comment]
            ]
        );
    }
 
    public function unbanUser($user_id): int
    {
        global $DIC;
 
        if (!is_array($user_id)) {
            $user_id = [$user_id];
        }
 
        $query = 'DELETE FROM ' . self::$banTable . ' WHERE room_id = %s AND ' . $DIC->database()->in('user_id', $user_id, false, 'integer');
        $types = ['integer'];
        $values = [$this->getRoomId()];
 
        return $DIC->database()->manipulateF($query, $types, $values);
    }
 
    public function isUserBanned(int $user_id): bool
    {
        global $DIC;
 
        $query = 'SELECT COUNT(user_id) cnt FROM ' . self::$banTable . ' WHERE user_id = %s AND room_id = %s';
        $types = ['integer', 'integer'];
        $values = [$user_id, $this->getRoomId()];
 
        $res = $DIC->database()->queryF($query, $types, $values);
 
        return ($row = $DIC->database()->fetchAssoc($res)) && $row['cnt'];
    }
 
    public function getBannedUsers(): array
    {
        global $DIC;
 
        $query = 'SELECT chb.* FROM ' . self::$banTable . ' chb INNER JOIN usr_data ud ON chb.user_id = ud.usr_id WHERE chb.room_id = %s ';
        $types = ['integer'];
        $values = [$this->getRoomId()];
        $res = $DIC->database()->queryF($query, $types, $values);
        $result = [];
 
        while ($row = $DIC->database()->fetchAssoc($res)) {
            if ($row['user_id'] > 0) {
                $user = new ilObjUser((int) $row['user_id']);
                $userdata = [
                    'user_id' => $user->getId(),
                    'firstname' => $user->getFirstname(),
                    'lastname' => $user->getLastname(),
                    'login' => $user->getLogin(),
                    'timestamp' => (int) $row['timestamp'],
                    'actor_id' => (int) $row['actor_id'],
                    'remark' => $row['remark']
                ];
 
                $result[] = $userdata;
            }
        }
 
        return $result;
    }
 
    public function getLastSession(ilChatroomUser $user): ?array
    {
        global $DIC;
 
        $query = 'SELECT * FROM ' . self::$sessionTable . ' WHERE user_id = ' .
            $DIC->database()->quote($user->getUserId(), 'integer') .
            ' ORDER BY connected DESC';
 
        $DIC->database()->setLimit(1);
        $res = $DIC->database()->query($query);
 
        if ($row = $DIC->database()->fetchAssoc($res)) {
            return $row;
        }
 
        return null;
    }
 
    public function getSessions(ilChatroomUser $user): array
    {
        global $DIC;
 
        $query = 'SELECT * FROM ' . self::$sessionTable
            . ' WHERE room_id = ' .
            $DIC->database()->quote($this->getRoomId(), 'integer') .
            ' ORDER BY connected DESC';
 
        $res = $DIC->database()->query($query);
 
        $result = [];
        while ($row = $DIC->database()->fetchAssoc($res)) {
            $result[] = $row;
        }
 
        return $result;
    }
 
    public function addPrivateRoom(string $title, ilChatroomUser $owner, array $settings): int
    {
        global $DIC;
 
        $nextId = $DIC->database()->nextId(self::$privateRoomsTable);
        $DIC->database()->insert(
            self::$privateRoomsTable,
            [
                'proom_id' => ['integer', $nextId],
                'parent_id' => ['integer', $this->roomId],
                'title' => ['text', $title],
                'owner' => ['integer', $owner->getUserId()],
                'closed' => ['integer', ($settings['closed'] ?? 0)],
                'created' => ['integer', ($settings['created'] ?? time())],
                'is_public' => ['integer', $settings['public']],
            ]
        );
 
        return $nextId;
    }
 
    public function closePrivateRoom(int $id): void
    {
        global $DIC;
 
        $DIC->database()->manipulateF(
            'UPDATE ' . self::$privateRoomsTable . ' SET closed = %s WHERE proom_id = %s',
            ['integer', 'integer'],
            [time(), $id]
        );
    }
 
    public function isOwnerOfPrivateRoom(int $user_id, int $proom_id): bool
    {
        global $DIC;
 
        $query = 'SELECT proom_id FROM ' . self::$privateRoomsTable . ' WHERE proom_id = %s AND owner = %s';
        $types = ['integer', 'integer'];
        $values = [$proom_id, $user_id];
 
        $res = $DIC->database()->queryF($query, $types, $values);
        if ($DIC->database()->fetchAssoc($res)) {
            return true;
        }
 
        return false;
    }
 
    public function sendInvitationNotification(
        ?ilChatroomObjectGUI $gui,
        $sender,
        int $recipient_id,
        int $subScope = 0,
        string $invitationLink = ''
    ): void {
        $links = [];
 
        if ($gui && $invitationLink === '') {
            $invitationLink = $this->getChatURL($gui, $subScope);
        }
 
        $links[] = new ilNotificationLink(
            new ilNotificationParameter('chat_join', [], 'chatroom'),
            $invitationLink
        );
 
        if ($recipient_id > 0 && ANONYMOUS_USER_ID !== $recipient_id) {
            if (is_numeric($sender) && $sender > 0) {
                $sender_id = $sender;
                $usr = ilObjectFactory::getInstanceByObjId($sender);
                $public_name = $usr->getPublicName();
            } elseif ($sender instanceof ilChatroomUser) {
                if ($sender->getUserId() > 0) {
                    $sender_id = $sender->getUserId();
                } else {
                    $sender_id = ANONYMOUS_USER_ID;
                }
                $public_name = $sender->getUsername();
            } else {
                throw new InvalidArgumentException(
                    '$sender must be an instance of ilChatroomUser or an id of an ilObjUser instance'
                );
            }
 
            $userLang = ilLanguageFactory::_getLanguageOfUser($recipient_id);
            $userLang->loadLanguageModule('mail');
            $bodyParams = [
                'link' => $invitationLink,
                'inviter_name' => $public_name,
                'room_name' => $this->getTitle(),
                'salutation' => ilMail::getSalutation($recipient_id, $userLang),
                'BR' => "\n",
            ];
 
            if ($subScope) {
                $bodyParams['room_name'] .= ' - ' . self::lookupPrivateRoomTitle($subScope);
            }
 
            $notification = new ilNotificationConfig(ChatInvitationNotificationProvider::NOTIFICATION_TYPE);
            $notification->setTitleVar('chat_invitation', $bodyParams, 'chatroom');
            $notification->setShortDescriptionVar('chat_invitation_short', $bodyParams, 'chatroom');
            $notification->setLongDescriptionVar('chat_invitation_long', $bodyParams, 'chatroom');
            $notification->setLinks($links);
            $notification->setIconPath('templates/default/images/icon_chtr.svg');
            $notification->setValidForSeconds(ilNotificationConfig::TTL_LONG);
            $notification->setVisibleForSeconds(ilNotificationConfig::DEFAULT_TTS);
            $notification->setIdentification(new NotificationIdentification(
                ChatInvitationNotificationProvider::NOTIFICATION_TYPE,
                self::ROOM_INVITATION . '_' . $this->getRefIdByRoomId($this->getRoomId()) . '_' . $subScope,
            ));
            $notification->setHandlerParam('mail.sender', (string) $sender_id);
 
            $notification->notifyByUsers([$recipient_id]);
        }
    }
 
    public function getChatURL(ilChatroomObjectGUI $gui, int $scope_id = 0): string
    {
        $url = '';
        if ($scope_id) {
            $url = ilLink::_getStaticLink($gui->getObject()->getRefId(), $gui->getObject()->getType(), true, '_' . $scope_id);
        } else {
            $url = ilLink::_getStaticLink($gui->getObject()->getRefId(), $gui->getObject()->getType());
        }
 
        return $url;
    }
 
    public function getTitle(): string
    {
        if (!$this->object) {
            $this->object = ilObjectFactory::getInstanceByObjId((int) $this->getSetting('object_id'));
        }
 
        return $this->object->getTitle();
    }
 
    public static function lookupPrivateRoomTitle(int $proom_id): string
    {
        global $DIC;
 
        $query = 'SELECT title FROM ' . self::$privateRoomsTable . ' WHERE proom_id = %s';
        $types = ['integer'];
        $values = [$proom_id];
 
        $rset = $DIC->database()->queryF($query, $types, $values);
        if ($row = $DIC->database()->fetchAssoc($rset)) {
            return $row['title'];
        }
 
        return 'unknown';
    }
 
    public function inviteUserToPrivateRoomByLogin(string $login, int $proom_id): void
    {
        $user_id = (int) ilObjUser::_lookupId($login);
        if ($user_id) {
            $this->inviteUserToPrivateRoom($user_id, $proom_id);
        }
    }
 
    public function inviteUserToPrivateRoom(int $user_id, int $proom_id): void
    {
        global $DIC;
 
        $DIC->database()->replace(
            self::$privateRoomsAccessTable,
            [
                'user_id' => ['integer', $user_id],
                'proom_id' => ['integer', $proom_id]
            ],
            []
        );
    }
 
    public function getActivePrivateRooms(int $userid): array
    {
        global $DIC;
 
        $query = '
                        SELECT roomtable.title, roomtable.proom_id, accesstable.user_id id, roomtable.owner rowner
                        FROM ' . self::$privateRoomsTable . ' roomtable
                        LEFT JOIN ' . self::$privateRoomsAccessTable . ' accesstable
                        ON roomtable.proom_id = accesstable.proom_id
                        AND accesstable.user_id = %s
                        WHERE parent_id = %s
                        AND (closed = 0 OR closed IS NULL)
                        AND (accesstable.user_id IS NOT NULL OR roomtable.owner = %s)';
        $types = ['integer', 'integer', 'integer'];
        $values = [$userid, $this->roomId, $userid];
        $rset = $DIC->database()->queryF($query, $types, $values);
        $rooms = [];
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $row['active_users'] = $this->listUsersInPrivateRoom((int) $row['id']);
            $row['owner'] = $row['rowner'];
            $rooms[$row['proom_id']] = $row;
        }
 
        return $rooms;
    }
 
    public function listUsersInPrivateRoom(int $private_room_id): array
    {
        global $DIC;
 
        $query = '
            SELECT chatroom_users.user_id FROM ' . self::$privateSessionsTable . '
            INNER JOIN chatroom_users
                ON chatroom_users.user_id = ' . self::$privateSessionsTable . ' .user_id WHERE proom_id = %s AND disconnected = 0
        ';
        $types = ['integer'];
        $values = [$private_room_id];
        $rset = $DIC->database()->queryF($query, $types, $values);
 
        $users = [];
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $users[(int) $row['user_id']] = (int) $row['user_id'];
        }
 
        return array_values($users);
    }
 
    public function subscribeUserToPrivateRoom(int $room_id, int $user_id): void
    {
        global $DIC;
 
        if (!$this->userIsInPrivateRoom($room_id, $user_id)) {
            $id = $DIC->database()->nextId(self::$privateSessionsTable);
            $DIC->database()->insert(
                self::$privateSessionsTable,
                [
                    'psess_id' => ['integer', $id],
                    'proom_id' => ['integer', $room_id],
                    'user_id' => ['integer', $user_id],
                    'connected' => ['integer', time()],
                    'disconnected' => ['integer', 0],
                ]
            );
        }
    }
 
    public function userIsInPrivateRoom(int $room_id, int $user_id): bool
    {
        global $DIC;
 
        $query = 'SELECT proom_id id FROM ' . self::$privateSessionsTable .
            ' WHERE user_id = %s AND proom_id = %s AND disconnected = 0';
        $types = ['integer', 'integer'];
        $values = [$user_id, $room_id];
        $rset = $DIC->database()->queryF($query, $types, $values);
        if ($DIC->database()->fetchAssoc($rset)) {
            return true;
        }
 
        return false;
    }
 
    public function unsubscribeUserFromPrivateRoom(int $room_id, int $user_id): void
    {
        global $DIC;
 
        $DIC->database()->update(
            self::$privateSessionsTable,
            [
                'disconnected' => ['integer', time()]
            ],
            [
                'proom_id' => ['integer', $room_id],
                'user_id' => ['integer', $user_id]
            ]
        );
    }
 
    public function countActiveUsers(): int
    {
        global $DIC;
 
        $query = 'SELECT COUNT(user_id) cnt FROM ' . self::$userTable . ' WHERE room_id = %s';
        $types = ['integer'];
        $values = [$this->roomId];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        if ($row = $DIC->database()->fetchAssoc($res)) {
            return (int) $row['cnt'];
        }
 
        return 0;
    }
 
    public function getPrivateRooms(): array
    {
        global $DIC;
 
        $query = 'SELECT * FROM ' . self::$privateRoomsTable . ' WHERE parent_id = %s';
        $rset = $DIC->database()->queryF($query, ['integer'], [$this->roomId]);
 
        $rooms = [];
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $rooms[] = $row;
        }
 
        return $rooms;
    }
 
    public function getPrivilegedUsersForPrivateRoom(int $subRoomId): array
    {
        global $DIC;
 
        $query = 'SELECT user_id FROM ' . self::$privateRoomsAccessTable . ' WHERE proom_id = %s';
        $rset = $DIC->database()->queryF($query, ['integer'], [$subRoomId]);
 
        $userIds = [];
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $userIds[] = (int) $row['user_id'];
        }
 
        return $userIds;
    }
 
    public function getUniquePrivateRoomTitle(string $title): string
    {
        global $DIC;
 
        $query = 'SELECT title FROM ' . self::$privateRoomsTable . ' WHERE parent_id = %s and closed = 0';
        $rset = $DIC->database()->queryF($query, ['integer'], [$this->roomId]);
 
        $titles = [];
        while ($row = $DIC->database()->fetchAssoc($rset)) {
            $titles[] = $row['title'];
        }
 
        $suffix = '';
        $i = 0;
        do {
            if (!in_array($title . $suffix, $titles, true)) {
                $title .= $suffix;
                break;
            }
 
            ++$i;
 
            $suffix = ' (' . $i . ')';
        } while (true);
 
        return $title;
    }
 
    public function getAccessibleRoomIdByTitleMap(int $user_id): array
    {
        global $DIC;
 
        $query = "
                        SELECT room_id, od.title, objr.ref_id
                        FROM object_data od
                        INNER JOIN  " . self::$settingsTable . "
                                ON object_id = od.obj_id
                        INNER JOIN object_reference objr
                                ON objr.obj_id = od.obj_id
                                AND objr.deleted IS NULL
                        INNER JOIN tree
                                ON tree.child = objr.ref_id
                                AND tree.tree = %s
                        WHERE od.type = %s
       ";
 
        $types = ['integer', 'text'];
        $values = [1, 'chtr'];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        $rooms = [];
        while ($row = $DIC->database()->fetchAssoc($res)) {
            if (self::checkPermissionsOfUser($user_id, 'read', (int) $row['ref_id'])) {
                $rooms[(int) $row['room_id']] = $row['title'];
            }
        }
 
        return $rooms;
    }
 
    public function getPrivateSubRooms(int $parent_room, int $user_id): array
    {
        global $DIC;
 
        $query = "
        SELECT      proom_id, parent_id
        FROM        " . self::$privateRoomsTable . "
        WHERE       parent_id = %s
        AND         owner = %s
        AND         closed = 0
        ";
 
        $types = ['integer', 'integer'];
        $values = [$parent_room, $user_id];
        $res = $DIC->database()->queryF($query, $types, $values);
 
        $priv_rooms = [];
        while ($row = $DIC->database()->fetchAssoc($res)) {
            $proom_id = (int) $row['proom_id'];
            $priv_rooms[$proom_id] = (int) $row['parent_id'];
        }
 
        return $priv_rooms;
    }
 
    public function getRefIdByRoomId(int $room_id): int
    {
        global $DIC;
 
        $query = "
       SELECT      objr.ref_id
       FROM        object_reference    objr
 
       INNER JOIN  chatroom_settings   cs
           ON      cs.object_id = objr.obj_id
 
       INNER JOIN  object_data     od
           ON      od.obj_id = cs.object_id
 
       WHERE       cs.room_id = %s
       ";
 
        $types = ['integer'];
        $values = [$room_id];
 
        $res = $DIC->database()->queryF($query, $types, $values);
 
        $row = $DIC->database()->fetchAssoc($res);
 
        return (int) ($row['ref_id'] ?? 0);
    }
 
    public function getLastMessages(int $number, ilChatroomUser $chatuser): array
    {
        global $DIC;
 
        // There is currently no way to check if a message is private or not
        // by sql. So we fetch twice as much as we need and hope that there
        // are not more than $number private messages.
        $DIC->database()->setLimit($number);
        $rset = $DIC->database()->query(
            'SELECT *
                        FROM ' . self::$historyTable . '
                        WHERE room_id = ' . $DIC->database()->quote($this->roomId, 'integer') . '
                        AND sub_room = 0
                        AND (
                                (' . $DIC->database()->like('message', 'text', '%"type":"message"%') . ' AND NOT ' . $DIC->database()->like('message', 'text', '%"public":0%') . ')
                                OR ' . $DIC->database()->like('message', 'text', '%"target":{%"id":"' . $chatuser->getUserId() . '"%') . '
                                OR ' . $DIC->database()->like('message', 'text', '%"from":{"id":' . $chatuser->getUserId() . '%') . '
                        )
                        ORDER BY timestamp DESC'
        );
 
        $result_count = 0;
        $results = [];
        while (($row = $DIC->database()->fetchAssoc($rset)) && $result_count < $number) {
            $tmp = json_decode($row['message'], false, 512, JSON_THROW_ON_ERROR);
            if (property_exists($tmp, 'target') && $tmp->target instanceof stdClass && (int) $tmp->target->public === 0) {
                if (in_array($chatuser->getUserId(), [(int) $tmp->target->id, (int) $tmp->from->id], true)) {
                    $results[] = $tmp;
                    ++$result_count;
                }
            } else {
                $results[] = $tmp;
                ++$result_count;
            }
        }
 
        if ($results !== []) {
            $rset = $DIC->database()->queryF(
                'SELECT *
                FROM ' . self::$historyTable . '
                WHERE room_id = %s
                AND sub_room = 0
                AND ' . $DIC->database()->like('message', 'text', '%%"type":"notice"%%') . '
                AND timestamp <= %s AND timestamp >= %s
                ORDER BY timestamp DESC',
                ['integer', 'integer', 'integer'],
                [$this->roomId, $results[0]->timestamp, $results[$result_count - 1]->timestamp]
            );
 
            while (($row = $DIC->database()->fetchAssoc($rset))) {
                $tmp = json_decode($row['message'], false, 512, JSON_THROW_ON_ERROR);
                $results[] = $tmp;
            }
        }
 
        usort($results, static function (stdClass $a, stdClass $b): int {
            $a_timestamp = strlen((string) $a->timestamp) === 13 ? ((int) substr((string) $a->timestamp, 0, -3)) : $a->timestamp;
            $b_timestamp = strlen((string) $b->timestamp) === 13 ? ((int) substr((string) $b->timestamp, 0, -3)) : $b->timestamp;
 
            return $b_timestamp - $a_timestamp;
        });
 
        return $results;
    }
 
    public function clearMessages(int $sub_room): void
    {
        global $DIC;
 
        $DIC->database()->queryF(
            'DELETE FROM ' . self::$historyTable . ' WHERE room_id = %s AND sub_room = %s',
            ['integer', 'integer'],
            [$this->roomId, $sub_room]
        );
 
        if ($sub_room) {
            $DIC->database()->queryF(
                'DELETE FROM ' . self::$privateSessionsTable . ' WHERE proom_id = %s AND disconnected < %s',
                ['integer', 'integer'],
                [$sub_room, time()]
            );
        } else {
            $DIC->database()->queryF(
                'DELETE FROM ' . self::$sessionTable . ' WHERE room_id = %s AND disconnected < %s',
                ['integer', 'integer'],
                [$this->roomId, time()]
            );
        }
    }
}