Node.js Passport integration Facebook authentication
Example
The passport-facebook module is used to implement a Facebook authentication. In this example, if the user does not exist on sign-in, he is created.
Implementing strategy :
const passport = require('passport');
const FacebookStrategy = require('passport-facebook').Strategy;
// Strategy is named 'facebook' by default
passport.use({
clientID: 'yourclientid',
clientSecret: 'yourclientsecret',
callbackURL: '/auth/facebook/callback'
},
// Facebook will send a token and user's profile
function(token, refreshToken, profile, next) {
// Check in database if user is already registered
findUserByFacebookId(profile.id, function(user) {
// If user exists, returns his data to callback
if (user) return next(null, user);
// Else, we create the user
else {
let newUser = createUserFromFacebook(profile, token);
newUser.save(function() {
// Pass the user to the callback
return next(null, newUser);
});
}
});
});
Creating routes :
// ...
app.use(passport.initialize());
app.use(passport.session());
// Authentication route
app.get('/auth/facebook', passport.authenticate('facebook', {
// Ask Facebook for more permissions
scope : 'email'
}));
// Called after Facebook has authenticated the user
app.get('/auth/facebook/callback',
passport.authenticate('facebook', {
successRedirect : '/me',
failureRedirect : '/'
}));
//...
app.listen(3000);
