@epac/node-client

A Node.js SDK for the ePacific Telecom platform. Node.js applications can use this library to respond to [webhooks] and to make [REST API calls] to a sbc platform.

Note: One suggested way to get up and running with this Node SDK is to use the npx create-epac-app command, which will scaffold out a application for you using this SDK.

Webooks

To respond to webhooks, you will need a lightweight http server. An example is shown below using express.

const {WebhookResponse} = require('@epac/node-client');
const express = require('express');
const app = express();

app.use(express.json());

app.post('/my-app', (req, res) => {
  const app = new WebhookResponse();
  app
    .pause({length: 1.5})
    .say({
      text: 'Good morning. This is a simple test of text to speech functionality.  That is all.  Goodbye',
      synthesizer: {
        vendor: 'google',
        language: 'en-US'
      }
    });
  res.status(200).json(app);
});

app.listen(port, () => {
  logger.info(`listening at http://localhost:${port}`);
});

See here for information on the available verbs you can use in a application, and for their associated properties.

Verifying webhook signature

If your server includes a Signature header on webhook requests, you can verify that the request was signed by using your webhook secret as follows:

const {WebhookResponse} = require('@epac/node-client');

if (process.env.WEBHOOK_SECRET) {
  app.use(WebhookResponse.verifyepacSignature(process.env.WEBHOOK_SECRET));
}

const express = require('express');
const app = express();

app.use(express.json());

/* make sure this comes after the body has been converted to json */
if (process.env.WEBHOOK_SECRET) {
  app.use(WebhookResponse.verifyepacSignature(process.env.WEBHOOK_SECRET));
}

/* if we get here we know the request was signed with our webhook secret */
app.post('/my-app', (req, res) => { ...})

REST API calls

Creating a client

To use the REST API you need to know your account sid and api key. You generate a REST client as shown below.

const client = require('@epac/node-client')(<my-account-sid>, <my-api-key>, {
  baseUrl: http://<my-sbc>
});

All of the above parameters are required (account sid, api key, and baseUrl);

Calls

Creating a call

const sid = await client.calls.create({
  from: '0915123456',
  to: {
    type: 'phone',
    number: '0888199876'
  },
  call_hook: 'http://myurl.com/myapp-webhook',
  call_status_hook: 'http://myurl.com/call-status'
});

See here for further details.

Updating a call

To update a call in progress -- for example to mute/unmute, hangup the call etc -- you need to know the call sid. Typically you would get this from a webhook sent from an existing call event.

  // play a whisper prompt to one party on the call
  await client.calls.update(<my-call-sid>, {
    whisper: {
        verb: 'say',
        text: 'You have 30 seconds remaining on this call.'
      }
    });

See here for further details.

Example

See here for a full-featured example application built using this API.

Status

This project is under active development and is currently very much pre-beta.