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        // Auto-login phpBB users:
        if(!$this->getRequestVar('logout') && ($user->data['user_id'] != ANONYMOUS)) {
            $this->setRequestVar('login', true);
        }
    }

    // Replace custom template tags:
    function replaceCustomTemplateTags($tag, $tagContent) {
        global $user;
        
        switch($tag) {

            case 'FORUM_LOGIN_URL':
                if($user->data['is_registered']) {
                    return ($this->getRequestVar('view') == 'logs') ? './?view=logs' : './';
                } else {
                    return $this->htmlEncode(generate_board_url().'/ucp.php?mode=login');
                }
                
            case 'REDIRECT_URL':
                if($user->data['is_registered']) {
                    return '';
                } else {
                    return $this->htmlEncode($this->getRequestVar('view') == 'logs' ? $this->getChatURL().'?view=logs' : $this->getChatURL());
                }
            
            default:
                return null;
        }
    }

    // Returns true if the userID of the logged in user is identical to the userID of the authentication system
    // or the user is authenticated as guest in the chat and the authentication system
    function revalidateUserID() {
        global $user;
        
        if($this->getUserRole() === AJAX_CHAT_GUEST && $user->data['user_id'] == ANONYMOUS || ($this->getUserID() === $user->data['user_id'])) {
            return true;
        }
        return false;
    }

    // Returns an associative array containing userName, userID and userRole
    // Returns null if login is invalid
    function getValidLoginUserData() {
        global $auth,$user;
        
        // Return false if given user is a bot:
        if($user->data['is_bot']) {
            return false;
        }
        
        // Check if we have a valid registered user:
        if($user->data['is_registered']) {
            $userData = array();
            $userData['userID'] = $user->data['user_id'];

            $userData['userName'] = $this->trimUserName($user->data['username']);
            
            if($auth->acl_get('a_'))
                $userData['userRole'] = AJAX_CHAT_ADMIN;
            elseif($auth->acl_get('m_'))
                $userData['userRole'] = AJAX_CHAT_MODERATOR;
            else
                $userData['userRole'] = AJAX_CHAT_USER;

            return $userData;
            
        } else {
            // Guest users:
            return $this->getGuestUser();
        }
    }