Passport Google OAuth2 Example

This is an Express 4 application using Google for authentication via OAuth2.

Based on the OAuth2 example in Jared Hanson’s passport-google-oauth, this Express 4 application uses Passport and the Passport Google OAuth strategy to enable users to authenticate with their Google accounts.

The client id and client secret needed to authenticate with Google can be set up from the Google Developer's Console.

Install

1. git clone https://github.com/barberboy/passport-google-oauth2-example myapp
2. cd myapp && npm install
3. Create a project and OAuth 2.0 client ID at https://console.developers.google.com
4. Add clientID, clientSecret, and callbackURL to config/auth.json

Configure Strategy

The Google OAuth 2.0 authentication strategy authenticates users using a Google account and OAuth 2.0 tokens. The strategy requires a verify callback, which accepts these credentials and calls done providing a user, as well as options specifying a client ID, client secret, and callback URL.

var GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;

passport.use(new GoogleStrategy({
    clientID: GOOGLE_CLIENT_ID,
    clientSecret: GOOGLE_CLIENT_SECRET,
    callbackURL: "http://127.0.0.1:3000/auth/google/callback"
  },
  function(accessToken, refreshToken, profile, done) {
    User.findOrCreate({ googleId: profile.id }, function (err, user) {
      return done(err, user);
    });
  }
));

Authenticate Requests

Use passport.authenticate(), specifying the 'google' strategy, to authenticate requests. Authentication with Google requires an extra scope parameter. For information, see the documentation.

app.get('/auth/google',
  passport.authenticate('google', { scope: ['email profile'] }));

app.get('/auth/google/callback',
  passport.authenticate('google', { failureRedirect: '/login' }),
  function(req, res) {
    // Authenticated successfully
    res.redirect('/');
  });

Credits

• Original example by Jared Hanson.

License

The MIT License