cryptography==2.7
flaky==3.6.1
gcp-devrel-py-tools==0.0.15
google-api-python-client==1.7.11
google-auth-httplib2==0.0.3
google-auth==1.6.3
google-cloud-iot==0.3.0
google-cloud-pubsub==1.0.0
oauth2client==4.1.3
paho-mqtt==1.4.0
pyjwt==1.7.1

@classmethod
    def create_gateway(cls, service_account_json, project_id, cloud_region, registry_id, device_id,
            gateway_id, certificate_file, algorithm):
        """Create a gateway to bind devices to."""
        # [START iot_create_gateway]
        # Check that the gateway doesn't already exist

        exists = False

        os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = current_app.config['GOOGLE_APPLICATION_CREDENTIALS']

        # credentials = service_account.Credentials.from_service_account_file(
        # "your-json-file - path -with-filename.json")

        client = iot_v1.DeviceManagerClient()

        parent = client.registry_path(project_id, cloud_region, registry_id)
        devices = list(client.list_devices(parent=parent))

        for device in devices:
            if device.id == gateway_id:
                exists = True
            print('Device: {} : {} : {} : {}'.format(
                device.id,
                device.num_id,
                device.config,
                device.gateway_config
            ))

        with io.open(certificate_file) as f:
            certificate = f.read()

        if algorithm == 'ES256':
            certificate_format = 'ES256_PEM'
        else:
            certificate_format = 'RSA_X509_PEM'

        # TODO: Auth type
        device_template = {
            'id': gateway_id,
            'credentials': [{
                'public_key': {
                    'format': certificate_format,
                    'key': certificate
                }
            }],
            'gateway_config': {
                'gateway_type': 'GATEWAY',
                'gateway_auth_method': 'ASSOCIATION_ONLY'
            }
        }

        if not exists:
            res = client.create_device(parent, device_template)
            print('Created Gateway {}'.format(res))
            return True
        else:
            print('Gateway exists, skipping')
            return False
        # [END iot_create_gateway]