(self, client_cert_callback=None)
return found_cert_key
Configures mutual TLS channel using the given client_cert_callback or
        application default SSL credentials. The behavior is controlled by
        `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable.
        (1) If the environment variable value is `true`, the function returns True
        if the channel is mutual TLS and False otherwise. The `http` provided
        in the constructor will be overwritten.
        (2) If the environment variable is not set or `false`, the function does
        nothing and it always return False.

        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.

        Returns:
            True if the channel is mutual TLS and False otherwise.

        Raises:
            google.auth.exceptions.MutualTLSChannelError: If mutual TLS channel
                creation failed for any reason.
Configures mutual TLS channel using the given client_cert_callback or
        application default SSL credentials. The behavior is controlled by
        `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable.
        (1) If the environment variable value is `true`, the function returns True
        if the channel is mutual TLS and False otherwise. The `http` provided
        in the constructor will be overwritten.
        (2) If the environment variable is not set or `false`, the function does
        nothing and it always return False.
Configures mutual TLS channel using the given client_cert_callback or application default SSL credentials . The behavior is controlled by GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable . ( 1 ) If the environment variable value is true the function returns True if the channel is mutual TLS and False otherwise . The http provided in the constructor will be overwritten . ( 2 ) If the environment variable is not set or false the function does nothing and it always return False .
def configure_mtls_channel(self, client_cert_callback=None):
        """Configures mutual TLS channel using the given client_cert_callback or
        application default SSL credentials. The behavior is controlled by
        `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable.
        (1) If the environment variable value is `true`, the function returns True
        if the channel is mutual TLS and False otherwise. The `http` provided
        in the constructor will be overwritten.
        (2) If the environment variable is not set or `false`, the function does
        nothing and it always return False.

        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.

        Returns:
            True if the channel is mutual TLS and False otherwise.

        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":
            return False

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

        try:
            found_cert_key, cert, key = transport._mtls_helper.get_client_cert_and_key(
                client_cert_callback
            )

            if found_cert_key:
                self.http = _make_mutual_tls_http(cert, key)
            else:
                self.http = _make_default_http()
        except (
            exceptions.ClientCertError,
            ImportError,
            OpenSSL.crypto.Error,
        ) as caught_exc:
            new_exc = exceptions.MutualTLSChannelError(caught_exc)
            six.raise_from(new_exc, caught_exc)

        if self._has_user_provided_http:
            self._has_user_provided_http = False
            warnings.warn(
                "`http` provided in the constructor is overwritten", UserWarning
            )

        return found_cert_key
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" : return False try : import OpenSSL except ImportError as caught_exc : new_exc = exceptions . MutualTLSChannelError ( caught_exc ) six . raise_from ( new_exc , caught_exc ) try : found_cert_key , cert , key = transport . _mtls_helper . get_client_cert_and_key ( client_cert_callback ) if found_cert_key : self . http = _make_mutual_tls_http ( cert , key ) else : self . http = _make_default_http ( ) except ( exceptions . ClientCertError , ImportError , OpenSSL . crypto . Error , ) as caught_exc : new_exc = exceptions . MutualTLSChannelError ( caught_exc ) six . raise_from ( new_exc , caught_exc ) if self . _has_user_provided_http : self . _has_user_provided_http = False warnings . warn ( "`http` provided in the constructor is overwritten" , UserWarning ) return found_cert_key