Passport strategy for authenticating with Facebook using the OAuth 2.0 API.
This module lets you authenticate using Facebook in your Node.js applications. By plugging into Passport, Facebook authentication can be easily and unobtrusively integrated into any application or framework that supports Connect-style middleware, including Express.
$ npm install passport-facebook
The Facebook authentication strategy authenticates users using a Facebook
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 app ID, app secret, and callback URL.
passport.use(new FacebookStrategy({
clientID: FACEBOOK_APP_ID,
clientSecret: FACEBOOK_APP_SECRET,
callbackURL: "http://localhost:3000/auth/facebook/callback"
},
function(accessToken, refreshToken, profile, done) {
User.findOrCreate({ facebookId: profile.id }, function (err, user) {
return done(err, user);
});
}
));
Use passport.authenticate(), specifying the 'facebook' strategy, to
authenticate requests.
For example, as route middleware in an Express application:
app.get('/auth/facebook',
passport.authenticate('facebook'));
app.get('/auth/facebook/callback',
passport.authenticate('facebook', { failureRedirect: '/login' }),
function(req, res) {
// Successful authentication, redirect home.
res.redirect('/');
});
If you need extended permissions from the user, the permissions can be requested
via the scope option to passport.authenticate().
For example, this authorization requests permission to the user's statuses and checkins:
app.get('/auth/facebook',
passport.authenticate('facebook', { scope: ['user_status', 'user_checkins'] }));
The display mode with which to render the authorization dialog can be set by
specifying the display option. Refer to Facebook's OAuth Dialog
documentation for more information.
app.get('/auth/facebook',
passport.authenticate('facebook', { display: 'touch' }));
The Facebook profile is very rich, and may contain a lot of information. The
strategy can be configured with a profileFields parameter which specifies a
list of fields (named by Portable Contacts convention) your application needs.
For example, to fetch only user's facebook ID, name, and picture, configure
strategy like this.
passport.use(new FacebookStrategy({
// clientID, clientSecret and callbackURL
profileFields: ['id', 'displayName', 'photos']
},
// verify callback
));
If profileFields is not specified, the default fields supplied by Facebook
will be parsed.
For a complete, working example, refer to the login example.
Facebook's OAuth 2.0 implementation has a [bug][1] in which the fragment #_=_
is appended to the callback URL. This appears to affect Firefox and Chrome, but
not Safari. This fragment can be removed via client-side JavaScript, and @niftylettuce
provides a suggested [workaround][2]. Developers are encouraged to direct their
complaints to Facebook in an effort to get them to implement a proper fix for
this issue.
[1]: https://developers.facebook.com/bugs/196125357123225
[2]: jaredhanson/passport-facebook#12 (comment)
$ npm install --dev
$ make test
Copyright (c) 2011-2013 Jared Hanson <http://jaredhanson.net/>