index.js

// Copyright 2016, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the 'License');
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License 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.

'use strict';

process.env.DEBUG = 'actions-on-google:*';

// We need the Dialogflow App client for all the magic here
const { DialogflowApp } = require('actions-on-google');
// To make our http request (a bit nicer)
const request = require('request');

// the actions we are supporting (get them from api.ai)
const ACTION_PRICE = 'price';
const ACTION_TOTAL = 'total';
const ACTION_BLOCK = 'block';
const ACTION_MARKET = 'marketcap';
const ACTION_INTERVAL = 'interval';

// The end-points to our calls
const EXT_BITCOIN_API_URL = 'https://blockchain.info';
const EXT_PRICE = '/q/24hrprice';
const EXT_TOTAL = '/q/totalbc';
const EXT_BLOCK_COUNT = '/q/getblockcount';
const EXT_MARKET_CAP = '/q/marketcap';
const EXT_INTERVAL = '/q/interval';

// [START Bitcoin Info]
const bitcoinInfo = (req, res) => {
  const assistant = new DialogflowApp({request: req, response: res});
  console.log('bitcoinInfoAction Request headers: ' + JSON.stringify(req.headers));
  console.log('bitcoinInfoAction Request body: ' + JSON.stringify(req.body));

  // Fulfill price action business logic
  function priceHandler (assistant) {
    request(EXT_BITCOIN_API_URL + EXT_PRICE, function (error, response, body) {
      // The fulfillment logic for returning the bitcoin current price
      console.log('priceHandler response: ' + JSON.stringify(response) + ' Body: ' + body + ' | Error: ' + error);
      const msg = 'Right now the price of a bitcoin is ' + body + ' USD. What else would you like to know?';
      assistant.ask(msg);
    });
  }

  // Fulfill total bitcoin action
  function totalHandler (assistant) {
    request(EXT_BITCOIN_API_URL + EXT_TOTAL, function (error, response, body) {
      console.log('totalHandler response: ' + JSON.stringify(response) + ' Body: ' + body + ' | Error: ' + error);
      // The fulfillment logic for returning the amount of bitcoins in the world
      const billionsBitcoins = body / 1000000000;
      const msg = 'Right now there are ' + billionsBitcoins + ' billion bitcoins around the world. What else would you like to know?';
      assistant.ask(msg);
    });
  }

  // Fulfill block count action
  function blockCountHandler (assistant) {
    request(EXT_BITCOIN_API_URL + EXT_BLOCK_COUNT, function (error, response, body) {
      console.log('blockCountHandler response: ' + JSON.stringify(response) + ' Body: ' + body + ' | Error: ' + error);
      const msg = 'Right now there are ' + body + ' blocks. What else would you like to know? the price?';
      assistant.ask(msg);
    });
  }

  // Fulfill market cap action
  function marketCaptHandler (assistant) {
    request(EXT_BITCOIN_API_URL + EXT_MARKET_CAP, function (error, response, body) {
      console.log('marketCaptHandler response: ' + JSON.stringify(response) + ' Body: ' + body + ' | Error: ' + error);
      const marketCapB = Math.round((body / 1000000000) * 100) / 100;
      const msg = 'Right now market cap is ' + marketCapB + ' billions. What else would you like to know?';
      assistant.ask(msg);
    });
  }

  // Fulfill interval action
  function intervalHandler (assistant) {
    request(EXT_BITCOIN_API_URL + EXT_INTERVAL, function (error, response, body) {
      console.log('interval response: ' + JSON.stringify(response) + ' Body: ' + body + ' | Error: ' + error);
      const msg = 'Right now the interval between blocks is ' + body + ' seconds. What else would you like to know?';
      assistant.ask(msg);
    });
  }

  // The Entry point to all our actions
  const actionMap = new Map();
  actionMap.set(ACTION_PRICE, priceHandler);
  actionMap.set(ACTION_TOTAL, totalHandler);
  actionMap.set(ACTION_BLOCK, blockCountHandler);
  actionMap.set(ACTION_MARKET, marketCaptHandler);
  actionMap.set(ACTION_INTERVAL, intervalHandler);

  assistant.handleRequest(actionMap);
};
// [END Bitcoin Info]
const functions = require('firebase-functions');
exports.bitcoinInfo = functions.https.onRequest(bitcoinInfo);