Auth ~ Passport Google OAuth - rohit120582sharma/Documentation GitHub Wiki

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

This module lets you authenticate using Google in your Node.js applications.

$ npm install passport-google-oauth20

Before using passport-google-oauth20, 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.

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-google-oauth20').Strategy;

passport.use(
    new GoogleStrategy(
        {
            clientID: process.env.GOOGLE_CLIENT_ID,
            clientSecret: process.env.GOOGLE_CLIENT_SECRET,
            callbackURL: '/auth/google/callback'
        },
        async (accessToken, refreshToken, profile, cb) => {
            try {
                const user = await User.findOrCreate({ providerId: profile.id });
                return cb(null, user);
            } catch(err) {
                return cb(err);
            }
        }
    )
);

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

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('/');
    }
);