Passport strategy for Google OAuth 2.0
Install
$ npm install @passport-next/passport-google-oauth2
Usage
Create an Application
Before using @passport-next/passport-google-oauth2, you must register an application with
Google. If you have not already done so, a new project can be created in the
Google Developers Console.
Your application will be issued a client ID and client 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.
Configure Strategy
The Google authentication strategy authenticates users using a Google account
and OAuth 2.0 tokens. The client 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 which contains the authenticated user's
Google profile. The verify callback must call cb providing a user to
complete authentication.
var GoogleStrategy = require('@passport-next/passport-google-oauth2').Strategy;
passport.use(new GoogleStrategy({
clientID: GOOGLE_CLIENT_ID,
clientSecret: GOOGLE_CLIENT_SECRET,
callbackURL: "http://www.example.com/auth/google/callback"
},
function(accessToken, refreshToken, profile, cb) {
User.findOrCreate({ googleId: profile.id }, function (err, user) {
return cb(err, user);
});
}
));
Authenticate Requests
Use passport.authenticate(), specifying the 'google' strategy, to
authenticate requests.
For example, as route middleware in an Express
application:
app.get('/auth/google',
passport.authenticate('google', { scope: ['profile'] }));
app.get('/auth/google/callback',
passport.authenticate('google', { failureRedirect: '/login' }),
function(req, res) {
// Successful authentication, redirect home.
res.redirect('/');
});
Examples
Developers using the popular Express web framework can
refer to an example
as a starting point for their own web applications. The example shows how to
authenticate users using Facebook. However, because both Facebook and Google
use OAuth 2.0, the code is similar. Simply replace references to Facebook with
corresponding references to Google.
