twilio/server.js

/**
 * Copyright 2019 Google Inc. 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.
 * 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.
 */
const express = require('express');
const request = require('request');
const app = express();
const dialogflowSessionClient =
    require('../botlib/dialogflow_session_client.js');
const bodyParser = require('body-parser');

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

const projectId = 'Place your dialogflow projectId here';
const phoneNumber = "Place your twilio phone number here";
const accountSid = 'Place your accountSid here';
const authToken = 'Place your authToken here';

const client = require('twilio')(accountSid, authToken);
const MessagingResponse = require('twilio').twiml.MessagingResponse;
const sessionClient = new dialogflowSessionClient(projectId);

const listener = app.listen(process.env.PORT, function() {
  console.log('Your Twilio integration server is listening on port '
      + listener.address().port);
});

app.post('/', async function(req, res) {
  const body = req.body;
  const text = body.Body;
  const id = body.From;
  const dialogflowResponse = (await sessionClient.detectIntent(
      text, id, body)).fulfillmentText;
  const twiml = new  MessagingResponse();
  const message = twiml.message(dialogflowResponse);
  res.send(twiml.toString());
});

process.on('SIGTERM', () => {
  listener.close(() => {
    console.log('Closing http server.');
    process.exit(0);
  });
});