/*
 * Copyright 2017-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with
 * the License. A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */
import { MqttOverWSProvider } from './MqttOverWSProvider';
import { Signer, Credentials } from '@aws-amplify/core';

const SERVICE_NAME = 'iotdevicegateway';

export class AWSIoTProvider extends MqttOverWSProvider {

    protected get region() { return this.options.aws_pubsub_region; }

    public getProviderName() { return 'AWSIoTProvider'; }

    protected get endpoint() {
        return (async () => {
            const endpoint = this.options.aws_pubsub_endpoint;

            const serviceInfo = {
                service: SERVICE_NAME,
                region: this.region
            };
            const { accessKeyId: access_key,
                secretAccessKey: secret_key,
                sessionToken: session_token,
            } = await Credentials.get();

            const result = Signer.signUrl(endpoint, { access_key, secret_key, session_token }, serviceInfo);

            return result;
        })();
    }

}