(self, client_cert_callback=None)
Configure the client certificate and key for SSL connection.

        The function does nothing unless `GOOGLE_API_USE_CLIENT_CERTIFICATE` is
        explicitly set to `true`. In this case if client certificate and key are
        successfully obtained (from the given client_cert_callback or from application
        default SSL credentials), a :class:`_MutualTlsAdapter` instance will be mounted
        to "https://" prefix.

        Args:
            client_cert_callback (Optional[Callable[[], (bytes, bytes)]]):
                The optional callback returns the client certificate and private
                key bytes both in PEM format.
                If the callback is None, application default SSL credentials
                will be used.

        Raises:
            google.auth.exceptions.MutualTLSChannelError: If mutual TLS channel
                creation failed for any reason.
Configure the client certificate and key for SSL connection.
Configure the client certificate and key for SSL connection .
def configure_mtls_channel(self, client_cert_callback=None):
        """Configure the client certificate and key for SSL connection.

        The function does nothing unless `GOOGLE_API_USE_CLIENT_CERTIFICATE` is
        explicitly set to `true`. In this case if client certificate and key are
        successfully obtained (from the given client_cert_callback or from application
        default SSL credentials), a :class:`_MutualTlsAdapter` instance will be mounted
        to "https://" prefix.

        Args:
            client_cert_callback (Optional[Callable[[], (bytes, bytes)]]):
                The optional callback returns the client certificate and private
                key bytes both in PEM format.
                If the callback is None, application default SSL credentials
                will be used.

        Raises:
            google.auth.exceptions.MutualTLSChannelError: If mutual TLS channel
                creation failed for any reason.
        """
        use_client_cert = os.getenv(
            environment_vars.GOOGLE_API_USE_CLIENT_CERTIFICATE, "false"
        )
        if use_client_cert != "true":
            self._is_mtls = False
            return

        try:
            import OpenSSL
        except ImportError as caught_exc:
            new_exc = exceptions.MutualTLSChannelError(caught_exc)
            six.raise_from(new_exc, caught_exc)

        try:
            (
                self._is_mtls,
                cert,
                key,
            ) = google.auth.transport._mtls_helper.get_client_cert_and_key(
                client_cert_callback
            )

            if self._is_mtls:
                mtls_adapter = _MutualTlsAdapter(cert, key)
                self.mount("https://", mtls_adapter)
        except (
            exceptions.ClientCertError,
            ImportError,
            OpenSSL.crypto.Error,
        ) as caught_exc:
            new_exc = exceptions.MutualTLSChannelError(caught_exc)
            six.raise_from(new_exc, caught_exc)
def configure_mtls_channel ( self , client_cert_callback = None ) : use_client_cert = os . getenv ( environment_vars . GOOGLE_API_USE_CLIENT_CERTIFICATE , "false" ) if use_client_cert != "true" : self . _is_mtls = False return try : import OpenSSL except ImportError as caught_exc : new_exc = exceptions . MutualTLSChannelError ( caught_exc ) six . raise_from ( new_exc , caught_exc ) try : ( self . _is_mtls , cert , key , ) = google . auth . transport . _mtls_helper . get_client_cert_and_key ( client_cert_callback ) if self . _is_mtls : mtls_adapter = _MutualTlsAdapter ( cert , key ) self . mount ( "https://" , mtls_adapter ) except ( exceptions . ClientCertError , ImportError , OpenSSL . crypto . Error , ) as caught_exc : new_exc = exceptions . MutualTLSChannelError ( caught_exc ) six . raise_from ( new_exc , caught_exc )