gistfile1.js

var twitterStrategy = require('passport-twitter').Strategy;
var facebookStrategy = require('passport-facebook').Strategy;
// Tem que criar um APP no twitter/facebook pra ter a chave publica e a secreta
// 
var config = require('../config/passport');

var twConfig = {
	consumerKey: config.twitter.key,
	consumerSecret: config.twitter.secret,
	callbackURL: '/auth/twitter/callback',
	passReqToCallback : true
};

var fbConfig = {
	clientID: config.facebook.id,
	clientSecret: config.facebook.secret,
	callbackURL: '/auth/facebook/callback',
	profileFields: ['id'],
	passReqToCallback : true
};

function serializeUser(user, done) {
	done(null, user);
}

function deserializeUser(obj, done) {
	done(null, obj);
}

function afterAuthFacebook(req, accessToken, tokenSecret, profile, done) {
    // Salvando a chave na sessão
    req.session.facebookToken = accessToken;
    done(null, profile);
}

function afterAuthTwitter(req, accessToken, tokenSecret, profile, done) {
    // Salvando as chaves na sessão
    req.session.twitterToken = accessToken;
    req.session.twitterTokenSecret = tokenSecret;

    // Twitter responde com nome do usr e oturas coisas se quiser salvar na sessão
    req.session.userName = profile.displayName;
    req.session.userPhoto = JSON.parse(profile._raw).profile_image_url;
    done(null, profile);
}

/**
 * exports
 */
module.exports = function(passport) {
    passport.serializeUser(serializeUser);
    passport.deserializeUser(deserializeUser);

    passport.use('twitter', new twitterStrategy(twConfig, afterAuthTwitter));
    passport.use('facebook', new facebookStrategy(fbConfig, afterAuthFacebook));
};

var express = require('express');
var router = express.Router();

   /**
   * Rotas
   */
module.exports = function(passport) {
  router.get('/auth/twitter', passport.authenticate('twitter'));
  router.get('/auth/facebook', passport.authenticate('facebook'));
  router.get('/auth/twitter/callback', passport.authenticate('twitter', {successRedirect: '/', failureRedirect: '/' }));
  router.get('/auth/facebook/callback', passport.authenticate('facebook', {successRedirect: '/', failureRedirect: '/' }));
}