TwiML Express App

package.json

{
  "name": "twiml-openai",
  "version": "0.1.0",
  "description": "TwiML OpenAI Integration",
  "main": "server.js",
  "scripts": {
    "server": "node server.js"
  },
  "author": "Michael Laccetti <michael@laccetti.com>",
  "license": "GPL-2.0-only",
  "dependencies": {
    "express": "4.17.1",
    "twilio": "3.51.0"
  }
}

server.js

const express = require('express');
const VoiceResponse = require('twilio').twiml.VoiceResponse;

const app = express();
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
const port = 13337;

app.post('/', (req, res) => {
  // Create TwiML response
  const response = new VoiceResponse();
  const gather = response.gather({
    language: 'en-CA',
    voice: 'woman',
    input: 'speech',
    action: 'https://twiml-openai.loca.lt/completed'
  });
  gather.say('Welcome to our demo, ask us a question.');

  response.redirect({
    method: 'POST'
  }, '/timeout');

  const responseText = response.toString();
  console.log(responseText);

  res.type('application/xml');
  res.send(responseText);
});

app.post('/timeout', (req, res) => {
  console.log(req.body);

  const response = new VoiceResponse();
  response.say({
    voice: 'woman',
    language: 'en-CA'
  }, 'Sorry, we didn\'t get that. Please call back and try again.');

  response.hangup();

  const responseText = response.toString();
  console.log(responseText);

  res.type('application/xml');
  res.send(responseText);
});


app.post('/completed', (req, res) => {
  console.log(req.body.SpeechResult);

  // this is where we would hook into OpenAI to feed gather the response

  const response = new VoiceResponse();
  response.say({
    voice: 'woman',
    language: 'en-CA'
  }, 'Thanks for sharing your question with us.');

  response.hangup();

  const responseText = response.toString();
  console.log(responseText);

  res.type('application/xml');
  res.send(responseText);
});

app.listen(port, () => {
  console.log(`TwiML OpenAI app listening at http://localhost:${port}`);
});