How to implement serverless authentication with Auth0 in a Koa application

  Arif Babu

         

  NodeJS



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Implementing serverless authentication with Auth0 in a Koa application involves several steps including setting up Auth0, creating middleware for authentication, and protecting routes. Below is a guide to achieve this:

1. Set Up Auth0

  1. Create an Auth0 Account: If you haven't already, sign up for an Auth0 account at https://auth0.com/.

  2. Create an Auth0 Application: After signing in to your Auth0 account, create a new application. Choose "Regular Web Applications" as the application type.

  3. Configure Auth0 Application: Configure your Auth0 application with appropriate settings such as Allowed Callback URLs, Allowed Logout URLs, and Allowed Web Origins.

2. Install Required Packages

bash
npm install koa koa-router koa-session koa-auth0-session

3. Implement Authentication Middleware

javascript
// authMiddleware.js
const { auth } = require('koa-auth0-session');

const authMiddleware = auth({
  // Auth0 application settings
  clientID: 'YOUR_AUTH0_CLIENT_ID',
  clientSecret: 'YOUR_AUTH0_CLIENT_SECRET',
  domain: 'YOUR_AUTH0_DOMAIN',
  redirectUri: 'http://localhost:3000/callback',
  postLogoutRedirectUri: 'http://localhost:3000',
});

module.exports = authMiddleware;

4. Protect Routes

javascript
// index.js
const Koa = require('koa');
const Router = require('koa-router');
const session = require('koa-session');
const authMiddleware = require('./authMiddleware');

const app = new Koa();
const router = new Router();

// Session middleware
app.keys = ['your-session-secret'];
app.use(session({}, app));

// Auth0 authentication middleware
app.use(authMiddleware);

// Example protected route
router.get('/protected', async (ctx) => {
  if (ctx.isAuthenticated()) {
    ctx.body = 'Protected Route';
  } else {
    ctx.status = 401;
    ctx.body = 'Unauthorized';
  }
});

app.use(router.routes());

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});

5. Handle Authentication Callback

javascript
// index.js (continued)
router.get('/callback', async (ctx) => {
  try {
    await ctx.authenticate();
    ctx.redirect('/');
  } catch (err) {
    ctx.status = 500;
    ctx.body = 'Authentication failed';
  }
});

6. Run the Application

Run your Koa application:

bash
node index.js

Visit http://localhost:3000 to access the protected route. It will redirect you to the Auth0 login page if you're not authenticated.

Make sure to replace 'YOUR_AUTH0_CLIENT_ID', 'YOUR_AUTH0_CLIENT_SECRET', and 'YOUR_AUTH0_DOMAIN' with your actual Auth0 credentials.

This implementation provides serverless authentication with Auth0 in a Koa application. Adjust configurations and routes according to your specific requirements.

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