Auth0 for Chrome Extensions

This package allows you to use Auth0 within a Chrome extension.

Overview

This package provides a generic PKCEClient.js file which allows you to use the Proof Key for Code Exchange spec, which is recommended for native applications.

With this package, you can set up your Chrome extension to use Auth0's hosted Lock widget. It uses the launchWebAuthFlow from Chrome's identity API to retrieve tokens from Auth0.

Integration

Getting Started

If you haven't already done so, sign up for your free Auth0 account and create an application in the dashboard. Find the domain and client ID from your app settings, as these will be required to integrate Auth0 in your Chrome extension. Note that the client type that you use has to be Native, or you will get unauthorized errors.

Chrome extensions are packaged as .crx files for distribution but may be loaded "unpacked" for development. For more information on how to load an unpacked extension, see the Chrome extension docs.

When loading your application as an unpacked extension, a unique ID will be generated for it. You must whitelist your callback URL (the URL that Auth0 will return to once authentication is complete) and the allowed origin URL.

In the Allowed Callback URLs section, whitelist your callback URL.

https://<YOUR_APP_ID>.chromiumapp.org/auth0

In the Allowed Origins section, whitelist your chrome extension as an origin.

chrome-extension://<YOUR_APP_ID>

Installation

Install the auth0-chrome package with npm.

npm install auth0-chrome

The dist folder contains a webpack bundle, including a minified version.

Configure your manifest.json file to run the auth0chrome script, along with an env.js and main.js script for your project. The default_popup should be set to an HTML file containing the content you would like to display.

{
  ...
  "browser_action": {
    "default_title": "Auth0",
    "default_popup": "src/browser_action/browser_action.html"
  },
  "background": {
    "scripts": ["./env.js", "node_modules/auth0-chrome/dist/auth0chrome.min.js", "src/main.js"],
    "persistent": false
  },
  "permissions": [
    "identity",
    "notifications"
  ]
}

Add your Auth0 credentials in the env.js file.

window.env = {
  AUTH0_DOMAIN: 'YOUR_AUTH0_DOMAIN',
  AUTH0_CLIENT_ID: 'YOUR_AUTH0_CLIENT_ID',
};

Login

Somewhere in your browser action, create a Log In button and when it is clicked, emit an event that can be picked up to trigger the authentication flow. For example, listen for click events with jQuery and emit a message called authenticate with chrome.runtime.sendMessage.

// ...
  $('.login-button').addEventListener('click', () => {
    $('.default').classList.add('hidden');
    $('.loading').classList.remove('hidden');
    chrome.runtime.sendMessage({
      type: "authenticate"
    });
  });
// ...

Your main.js file is where you should add the listener for the authenticate event. This is where you can instantiate Auth0Chrome and call the authenticate method to start the flow and save the authentication result when it comes back.

// src/main.js

chrome.runtime.onMessage.addListener(function (event) {
  if (event.type === 'authenticate') {

    // scope
    //  - openid if you want an id_token returned
    //  - offline_access if you want a refresh_token returned
    // device
    //  - required if requesting the offline_access scope.
    let options = {
      scope: 'openid offline_access',
      device: 'chrome-extension'
    };

    new Auth0Chrome(env.AUTH0_DOMAIN, env.AUTH0_CLIENT_ID)
      .authenticate(options)
      .then(function (authResult) {
        localStorage.authResult = JSON.stringify(authResult);
        chrome.notifications.create({
          type: 'basic',
          iconUrl: 'icons/icon128.png',
          title: 'Login Successful',
          message: 'You can use the app now'
        });
      }).catch(function (err) {
      chrome.notifications.create({
        type: 'basic',
        title: 'Login Failed',
        message: err.message,
        iconUrl: 'icons/icon128.png'
      });
    });
  }
});

Auth0's hosted Lock widget will be displayed in a new window.

Using the Library

Auth0CLient(domain, clientId)

The library exposes Auth0Client which extends a generic PKCEClient.

• domain : Your Auth0 Domain, to create one please visit https://auth0.com/
• clientId: The clientId for the chrome client, to create one
  • Visit https://manage.auth0.com/#/clients and click on + Create Client
  • Select "Native" as the client type
  • In the Allowed Callback URLs section, add https://<yourchromeappid>.chromiumapps.org/auth0 as an allowed callback url
  • In the Allowed Origins section, add chrome-extension://<yourchromeappid>

Promise <Object> Auth0Client#authenticate(options, interactive)

The authenticate method makes a call to the Authentication API and renders the log in UI if userinteraction is required. Upon completion, this method will resolve an object which will contain the requested token and meta information related to the authentication process.

• options: object - accepts all the parameters valid for Auth0's Authentication API except for redirect_uri, response_type, code_challenge & code_challenge_method as these are controlled by the library

• interactive: boolean - if set to false for advanced use-cases, Chrome will throw an error if user-interaction is required during login

The access_token returned at the end of the authentication flow can then be used to make authenticated calls to your API. For more information on using access tokens, see the full documentation.

Contributing

Pull requests are welcome!

Development

Install the dev dependencies.

npm install

When changes are made, run npm run build to produce new files for the dist folder.

What is Auth0?

Auth0 helps you to:

• Add authentication with multiple authentication sources, either social like Google, Facebook, Microsoft Account, LinkedIn, GitHub, Twitter, Box, Salesforce, amont others, or enterprise identity systems like Windows Azure AD, Google Apps, Active Directory, ADFS or any SAML Identity Provider.
• Add authentication through more traditional username/password databases.
• Add support for linking different user accounts with the same user.
• Support for generating signed Json Web Tokens to call your APIs and flow the user identity securely.
• Analytics of how, when and where users are logging in.
• Pull data from other sources and add it to the user profile, through JavaScript rules.

Create a free Auth0 account

1. Go to Auth0 and click Sign Up.
2. Use Google, GitHub or Microsoft Account to login.

Issue Reporting

If you have found a bug or if you have a feature request, please report them at this repository issues section. Please do not report security vulnerabilities on the public GitHub issue tracker. The Responsible Disclosure Program details the procedure for disclosing security issues.

Author

Auth0

License

This project is licensed under the MIT license. See the LICENSE file for more info.