passport-polar

Passport strategy for authenticating with Polar using the OAuth 2.0 API.

This module lets you authenticate using Polar in your Node.js applications. By plugging into Passport, Polar authentication can be easily and unobtrusively integrated into any application or framework that supports Connect-style middleware, including Express.

Install

$ npm install passport-polar

Usage

Create an Application

Before using passport-polar, you must register an application with Polar. If you have not already done so, a new application can be created at Polar Admin. Your application will be issued an app ID and app secret, which need to be provided to the strategy. You will also need to configure a redirect URI which matches the route in your application.

Please note: even though the Polar Access Link asks for domain when you are setting up a new app, actually they mean URL, it's enough to set http://myapp.com, you have to set http://myapp.com/auth/polar/callback.

Configure Strategy

The Polar authentication strategy authenticates users using a Polar account and OAuth 2.0 tokens. The app ID and secret obtained when creating an application are supplied as options when creating the strategy. The strategy also requires a verify callback, which receives the access token and optional refresh token, as well as profile and params. Unlikely to other strategies the profile won't be set, it will be always an empty object ({}). But the params will contain the user id.

{ 
  access_token: 'access-token',
  token_type: 'bearer',
  expires_in: 473039999,
  x_user_id: 123445566
}

Here you have to register your user as the documentation describes.

The verify callback must call cb providing a user to complete authentication.

passport.use(new PolarStrategy({
    clientID: POLAR_APP_ID,
    clientSecret: POLAR_APP_SECRET,
    callbackURL: 'http://localhost:3000/auth/polar/callback',
    scope: 'accesslink.read_all'
  },
  function (accessToken, refreshToken, params, profile, cb) {
    /*
     1. fetch https://www.polaraccesslink.com/v3/users/${params.x_user_id}(https://www.polar.com/accesslink-api/?javascript--nodejs#get-user-information)
     2. if empty string is returned, then we need to register the user, otherwise call the `cb` with the fetched data
     3. register the user (https://www.polar.com/accesslink-api/?javascript--nodejs#register-user)
     4. call the `cb` with received user information
   */
  }
));

Authenticate Requests

Use passport.authenticate(), specifying the 'polar' strategy, to authenticate requests.

For example, as route middleware in an Express application:

app.get('/auth/polar',
  passport.authenticate('polar'));

app.get('/auth/polar/callback',
  passport.authenticate('polar', { failureRedirect: '/login' }),
  function(req, res) {
    // Successful authentication, redirect home.
    res.redirect('/');
  });

Examples

You can find a complete example in the example, you can try it out:

1. get your client id and client secret
2. cd example
3. cp .env.example .env
4. add these parameters to .env
5. node app.js
6. navigate to http://localhost:3000
7. you should receive: No user logged in, go to /login
8. navigate to http://localhost:3000/login
9. you should get redirected to the Polar page and once you approve the app, redirected back to http://localhost:3000 where you should your profile's information.

Tests

The test suite is located in the test/ directory. All new features are expected to have corresponding test cases. Ensure that the complete test suite passes by executing:

npm test

Acknowledgement

Thanks Jared Hanson http://jaredhanson.net/ for making Passport.js happen.

License

The MIT License

Copyright (c) 2018 Robert Oroszi