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client-inbound.js
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client-inbound.js
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// core modules
const fs = require('fs');
const http = require('http');
const https = require('https');
// modules installed from npm
const { EventEmitter } = require('events');
const express = require('express');
const bodyParser = require('body-parser');
const { createDecipher } = require('crypto');
const { connect } = require('ngrok');
require('dotenv').config();
const _ = require('lodash');
// application modules
const logger = require('./logger');
const {
playVoiceIVR, hangupCall, acceptCall,
} = require('./voiceapi');
// Express app setup
const app = express();
const eventEmitter = new EventEmitter();
let server;
let webHookUrl;
let activeCall = false;
let retryCounter = 0;
let digitCollected = false;
const call = {};
const sseMsg = [];
const servicePort = process.env.SERVICE_PORT || 3000;
// Handle error generated while creating / starting an http server
function onError(error) {
if (error.syscall !== 'listen') {
throw error;
}
switch (error.code) {
case 'EACCES':
logger.error(`Port ${servicePort} requires elevated privileges`);
process.exit(1);
break;
case 'EADDRINUSE':
logger.error(`Port ${servicePort} is already in use`);
process.exit(1);
break;
default:
throw error;
}
}
// shutdown the node server forcefully
function shutdown() {
server.close(() => {
logger.error('Shutting down the server');
process.exit(0);
});
setTimeout(() => {
process.exit(1);
}, 10000);
}
// exposes web server running on local machine to the internet
// @param - web server port
// @return - public URL of your tunnel
function createNgrokTunnel() {
server = app.listen(servicePort, () => {
console.log(`Server running on port ${servicePort}`);
(async () => {
try {
webHookUrl = await connect({ proto: 'http', addr: servicePort });
console.log('ngrok tunnel set up:', webHookUrl);
} catch (error) {
console.log(`Error happened while trying to connect via ngrok ${JSON.stringify(error)}`);
shutdown();
return;
}
webHookUrl += '/event';
console.log(`To call webhook while inbound calls, Update this URL in portal: ${webHookUrl}`);
})();
});
}
// Set webhook event url
function setWebHookEventUrl() {
logger.info(`Listening on Port ${servicePort}`);
webHookUrl = `${process.env.PUBLIC_WEBHOOK_HOST}/event`;
logger.info(`To call webhook while inbound calls, Update this URL in portal: ${webHookUrl}`);
}
// create and start an HTTPS node app server
// An SSL Certificate (Self Signed or Registered) is required
function createAppServer() {
if (process.env.LISTEN_SSL) {
const options = {
key: fs.readFileSync(process.env.CERTIFICATE_SSL_KEY).toString(),
cert: fs.readFileSync(process.env.CERTIFICATE_SSL_CERT).toString(),
};
if (process.env.CERTIFICATE_SSL_CACERTS) {
options.ca = [];
options.ca.push(fs.readFileSync(process.env.CERTIFICATE_SSL_CACERTS).toString());
}
// Create https express server
server = https.createServer(options, app);
} else {
// Create http express server
server = http.createServer(app);
}
app.set('port', servicePort);
server.listen(servicePort);
server.on('error', onError);
server.on('listening', setWebHookEventUrl);
}
/* Initializing WebServer */
if (process.env.ENABLEX_APP_ID && process.env.ENABLEX_APP_KEY) {
if (process.env.USE_NGROK_TUNNEL === 'true' && process.env.USE_PUBLIC_WEBHOOK === 'false') {
createNgrokTunnel();
} else if (process.env.USE_PUBLIC_WEBHOOK === 'true' && process.env.USE_NGROK_TUNNEL === 'false') {
createAppServer();
} else {
logger.error('Incorrect configuration - either USE_NGROK_TUNNEL or USE_PUBLIC_WEBHOOK should be set to true');
}
} else {
logger.error('Please set env variables - ENABLEX_APP_ID, ENABLEX_APP_KEY');
}
process.on('SIGINT', () => {
logger.info('Caught interrupt signal');
shutdown();
});
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(express.static('client'));
// It will send stream / events all the events received from webhook to the client
app.get('/event-stream', (req, res) => {
res.writeHead(200, {
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-cache',
Connection: 'keep-alive',
});
const id = (new Date()).toLocaleTimeString();
setInterval(() => {
if (!_.isEmpty(sseMsg[0])) {
const data = `${sseMsg[0]}`;
res.write(`id: ${id}\n`);
res.write(`data: ${data}\n\n`);
sseMsg.pop();
}
}, 100);
});
// Webhook event which will be called by EnableX server once an outbound call is made
// It should be publicly accessible. Please refer document for webhook security.
app.post('/event', (req, res) => {
logger.info('called');
let jsonObj;
if (req.headers['x-algoritm'] !== undefined) {
const key = createDecipher(req.headers['x-algoritm'], process.env.ENABLEX_APP_ID);
let decryptedData = key.update(req.body.encrypted_data, req.headers['x-format'], req.headers['x-encoding']);
decryptedData += key.final(req.headers['x-encoding']);
jsonObj = JSON.parse(decryptedData);
logger.info(JSON.stringify(jsonObj));
} else {
jsonObj = req.body;
logger.info(JSON.stringify(jsonObj));
}
res.send();
res.status(200);
eventEmitter.emit('voicestateevent', jsonObj);
});
// Call is completed / disconneted, inform server to hangup the call
function timeOutHandler() {
logger.info(`[${call.voice_id}] Disconnecting the call`);
hangupCall(call.voice_id, () => {});
}
/* WebHook Event Handler function */
function voiceEventHandler(voiceEvent) {
if (activeCall === false && voiceEvent.state === 'incomingcall') {
activeCall = true;
call.voice_id = voiceEvent.voice_id;
const eventMsg = `[${call.voice_id}] Received an inbound Call`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
acceptCall(call.voice_id, () => {});
} else if (voiceEvent.state && voiceEvent.state === 'disconnected') {
const eventMsg = `[${call.voice_id}] Call is disconnected`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
activeCall = false;
retryCounter = 0;
digitCollected = false;
} else if (voiceEvent.playstate !== undefined) {
if (voiceEvent.playstate === 'playfinished' && voiceEvent.prompt_ref === '3') {
const eventMsg = `[${call.voice_id}] DTMF prompt played, Disconnecting the call in 10 Sec`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
setTimeout(timeOutHandler, 10000);
} else if (voiceEvent.playstate === 'playfinished' && voiceEvent.prompt_ref === '2') {
if (digitCollected === false) {
const eventMsg = `[${call.voice_id}] 1st Level IVR menu is finished, Disconnecting the call in 10 Sec`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
setTimeout(timeOutHandler, 10000);
}
} else if (voiceEvent.playstate === 'digitcollected' && voiceEvent.prompt_ref === '2') {
digitCollected = true;
const eventMsg = `[${call.voice_id}] Received DTMF Digit ${voiceEvent.digit}`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
const dtmfPrompt = `DTMF received is ${voiceEvent.digit}, Disconnecting the call in 10 seconds`;
const playCommand = JSON.stringify({
text: dtmfPrompt,
voice: 'female',
language: 'en-US',
prompt_ref: '3',
});
playVoiceIVR(call.voice_id, playCommand, () => {});
} else if (voiceEvent.playstate === 'playfinished') {
const eventMsg = `[${call.voice_id}] Greeting is completed, Playing IVR Menu`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
/* Playing IVR menu using TTS */
const playCommand = JSON.stringify({
text: 'This is the 1st level IVR menu, please press 1 for accounts, press 2 for engineering, press 3 to connect to a agent',
voice: 'female',
language: 'en-US',
dtmf: true,
interrupt: false,
prompt_ref: '2',
});
playVoiceIVR(call.voice_id, playCommand, () => {});
} else if ((retryCounter !== 3) && voiceEvent.playstate === 'menutimeout' && voiceEvent.prompt_ref === '2') {
sseMsg.push(`[${call.voice_id}] no digit provided, Please press a digit, please press 1 for accounts, press 2 for engineering, press 3 to connect to a agent`);
retryCounter += 1;
const playCommand = JSON.stringify({
text: 'You have not provided any digit, Please press a digit, please press 1 for accounts, press 2 for engineering, press 3 to connect to a agent',
voice: 'female',
language: 'en-US',
dtmf: true,
interrupt: false,
prompt_ref: '2',
});
playVoiceIVR(call.voice_id, playCommand, () => {});
} else if (retryCounter === 3) {
sseMsg.push(`[${call.voice_id}] no digit provided, Disconnecting the call in 10 seconds`);
const playCommand = JSON.stringify({
text: 'You have not provided any digit, Disconnecting the call in 10 seconds',
voice: 'female',
language: 'en-US',
prompt_ref: '3',
});
playVoiceIVR(call.voice_id, playCommand, () => {});
}
} else if (activeCall === true && voiceEvent.state === 'incomingcall') {
const eventMsg = `Already 1 call is active, Rejecting this Incoming Call ${voiceEvent.voice_id}`;
logger.info(eventMsg);
sseMsg.push(eventMsg);
hangupCall(voiceEvent.voice_id, () => {});
}
}
/* Registering WebHook Event Handler function */
eventEmitter.on('voicestateevent', voiceEventHandler);