PassportJS Usage

server.js

 var passport = require('passport'),
     FacebookStrategy = require('passport-facebook').Strategy,
     TwitterStrategy = require('passport-twitter').Strategy,
     GithubStrategy = require('passport-github').Strategy,
     GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;

/* ...server setup... */

// Setup passport auth
app.use(passport.initialize());
app.use(passport.session());
var passportCallback = function(accessToken, refreshToken, profile, done){
    process.nextTick(function () {
        return done(null, profile);
    });
};

try{
    passport.use(new FacebookStrategy({
        clientID:       config['FACEBOOK_CLIENTID'],
        clientSecret:   config['FACEBOOK_CLIENTSECRET'],
        callbackURL:    config['FACEBOOK_CALLBACKURL']
    }, passportCallback));
    passport.use(new TwitterStrategy({
         consumerKey:    config['TWITTER_CONSUMERKEY'],
         consumerSecret: config['TWITTER_CONSUMERSECRET'],
         callbackURL:    config['TWITTER_CALLBACKURL']
    }, passportCallback));
    passport.use(new GithubStrategy({
        clientID:       config['GITHUB_CLIENTID'],
        clientSecret:   config['GITHUB_CLIENTSECRET'],
        callbackURL:    config['GITHUB_CALLBACKURL']
    },passportCallback));
    passport.use(new GoogleStrategy({
        clientID:       config['GOOGLE_CLIENTID'],
        clientSecret:   config['GOOGLE_CLIENTSECRET'],
        callbackURL:    config['GOOGLE_CALLBACKURL']
    },passportCallback));
}catch (e){
    console.error("[*]\tError initializing authentication protocols");
    console.error(e);
}

// AUTH Routes
["facebook", "twitter", "google", "github"].forEach(function(name){
    var mid1, mid2;
    var mid = name === "google" ? {scope: 'https://www.googleapis.com/auth/plus.me'} : undefined;

    app.get('/auth/' + name, passport.authenticate(name, mid));
    app.get('/auth/' + name + '/callback', passport.authenticate(name, {failureRedirect: '/'}),
        function(req,res){ res.redirect('/')});
});

app.get('/logout', function(req, res){
    req.logout();
    res.redirect('/');
});


// serialize and deserialize
passport.serializeUser(function(user, done) { done(null, user); });
passport.deserializeUser(function(obj, done) { done(null, obj); });

// test authentication
function ensureAuthenticated(req, res, next) {
    if (req.isAuthenticated()) { return next(); }
    res.redirect('/')
}