Cognito@Edge

Cognito authentication made easy to protect your website with CloudFront and Lambda@Edge.

This Node.js package helps you verify that users making requests to a CloudFront distribution are authenticated using a Cognito user pool. It achieves that by looking at the cookies included in the request and, if the requester is not authenticated, it will redirect then to the user pool's login page.

Alternatives

This package allows you to easily parse and verify Cognito cookies in a Lambda@Edge function. If you want full control over the configuration of AWS resources (CloudFront, Cognito, Lambda@Edge...), this is the solution for you.

If you want to try it out easily or to quickstart a new project, we recommend having a look at the cognito-at-edge-federated-ui-sample repository. It allows you to configure and deploy a sample application which uses Cognito@Edge in a few CLI commands.

If you need more configuration options (e.g. bring your own user pool or CloudFront distribution), you may want to use this Serverless Application Repository application (GitHub) which provides a complete Auth@Edge solution. It does not use Cognito@Edge, but provides similar functionality.

Getting started

How To Install

The preferred way to install the AWS cognito-at-edge for Node.js is to use the npm package manager for Node.js. Simply type the following into a terminal window:

npm install cognito-at-edge

Usage

To use the package, you must create a Lambda@Edge function and associate it with the CloudFront distribution's viewer request events.

Within your Lambda@Edge function, you can import and use the Authenticator class as shown here:

const { Authenticator } = require('cognito-at-edge');

const authenticator = new Authenticator({
  // Replace these parameter values with those of your own environment
  region: 'us-east-1', // user pool region
  userPoolId: 'us-east-1_tyo1a1FHH', // user pool ID
  userPoolAppId: '63gcbm2jmskokurt5ku9fhejc6', // user pool app client ID
  userPoolDomain: 'domain.auth.us-east-1.amazoncognito.com', // user pool domain
});

exports.handler = async (request) => authenticator.handle(request);

For an explanation of the interactions between CloudFront, Cognito and Lambda@Edge, we recommend reading this AWS blog article which describe the required architecture to authenticate requests in CloudFront with Cognito.

Reference - Authenticator Class

Authenticator(params)

• params Object Authenticator parameters:
  • region string Cognito UserPool region (eg: us-east-1)
  • userPoolId string Cognito UserPool ID (eg: us-east-1_tyo1a1FHH)
  • userPoolAppId string Cognito UserPool Application ID (eg: 63gcbm2jmskokurt5ku9fhejc6)
  • userPoolAppSecret string (Optional) Cognito UserPool Application Secret (eg: oh470px2i0uvy4i2ha6sju0vxe4ata9ol3m63ufhs2t8yytwjn7p)
  • userPoolDomain string Cognito UserPool domain (eg: your-domain.auth.us-east-1.amazoncognito.com)
  • cookieExpirationDays number (Optional) Number of day to set cookies expiration date, default to 365 days (eg: 365). It's recommended to set this value to match refreshTokenValidity parameter of the pool client.
  • disableCookieDomain boolean (Optional) Sets domain attribute in cookies, defaults to false (eg: false)
  • httpOnly boolean (Optional) Forbids JavaScript from accessing the cookies, defaults to false (eg: false). Note, if this is set to true, the cookies will not be accessible to Amplify auth if you are using it client side.
  • sameSite Strict | Lax | None (Optional) Allows you to declare if your cookie should be restricted to a first-party or same-site context (eg: SameSite=None).
  • cookiePath string (Optional) Sets Path attribute in cookies
  • logLevel string (Optional) Logging level. Default: 'silent'. One of 'fatal', 'error', 'warn', 'info', 'debug', 'trace' or 'silent'.

This is the class constructor.

handle(request)

• request Object Lambda@Edge request object
  • See AWS doc for details: Lambda@Edge events

Use it as your Lambda Handler. It will authenticate each query.

const authenticator = new Authenticator( ... );
exports.handler = async (request) => authenticator.handle(request);

Getting Help

The best way to interact with our team is through GitHub. You can open an issue and choose from one of our templates for bug reports, feature requests or question.

Contributing

We welcome community contributions and pull requests. See CONTRIBUTING.md for information on how to set up a development environment and submit code.

License

This project is licensed under the Apache License, Version 2.0, see LICENSE.txt and NOTICE.txt for more information.