voxa/src/platforms/alexa/apis/AuthenticationBase.ts

A fsm (state machine) framework for Alexa, Dialogflow, Facebook Messenger and Botframework apps using Node.js

/*
 * Copyright (c) 2018 Rain Agency <contact@rain.agency>
 * Author: Rain Agency <contact@rain.agency>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import * as querystring from "querystring";
import * as rp from "request-promise";

/**
 * Messaging API class reference
 * https://developer.amazon.com/docs/smapi/skill-messaging-api-reference.html
 */
export class AuthenticationBase {
  constructor(public clientId: string, public clientSecret: string) {
  }
  /**
   * Gets new access token
   * https://developer.amazon.com/docs/smapi/configure-an-application-or-service-to-send-messages-to-your-skill.html
   */
  public getAuthenticationToken(scope: string): Promise<any> {
    const bodyRequest = {
      client_id: this.clientId,
      client_secret: this.clientSecret,
      grant_type: "client_credentials",
      scope,
    };

    const options = {
      body: decodeURIComponent(querystring.stringify(bodyRequest)),
      headers: {
        "Content-Type": "application/x-www-form-urlencoded",
      },
      json: true, // Automatically parses the JSON string in the response
      method: "POST",
      uri: "https://api.amazon.com/auth/O2/token",
    };

    return Promise.resolve(rp(options));
  }
}