Horde\ManageSieve::_cmdAuthenticate PHP Method

    protected function _cmdAuthenticate($uid, $pwd, $authmethod = null, $euser = '')
    {
        $method = $this->_getBestAuthMethod($authmethod);
        switch ($method) {
            case self::AUTH_DIGESTMD5:
                $this->_authDigestMD5($uid, $pwd, $euser);
                return;
            case self::AUTH_CRAMMD5:
                $this->_authCRAMMD5($uid, $pwd, $euser);
                break;
            case self::AUTH_LOGIN:
                $this->_authLOGIN($uid, $pwd, $euser);
                break;
            case self::AUTH_PLAIN:
                $this->_authPLAIN($uid, $pwd, $euser);
                break;
            case self::AUTH_EXTERNAL:
                $this->_authEXTERNAL($uid, $pwd, $euser);
                break;
            default:
                throw new Exception($method . ' is not a supported authentication method');
                break;
        }
        $this->_doCmd();
        // Query the server capabilities again now that we are authenticated.
        try {
            $this->_cmdCapability();
        } catch (Exception $e) {
            throw new Exception\ConnectionFailed($e);
        }
    }