app.js

var express = require('express'),
   app = express(),
   // ...
   passport = require('passport'),
   MongoStore = require('connect-mongo')(express),
   Flash = require('connect-flash');

// View stuff

app.configure(function(){
    // Indicate port to use
    app.set('port', process.env.PORT || 3000);

    // Setup static files
    app.use(express.static(path.join(__dirname, 'public')));
    // ...
    app.use(express.bodyParser());
    app.use(express.methodOverride());

    app.use(express.cookieParser());
    app.use(express.session({store: new MongoStore({db:'express-sessions'}), secret: 'SOMETHINGSECRET-HERE' }));

    app.use(passport.initialize());
    app.use(passport.session());
    app.use(Flash());

    app.use(app.router);
    app.use(not_found);
});

// more stuff

// Configure rest end points
require('./rest/')(app);
// Configure the routes (the actual pages)
require('./routes')(app);
// Configure auth (facebook login and all that)
require('./auth').configureExpress(app);

// Create the server
server.listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});

auth.coffee

passport = require 'passport'
FacebookStrategy = require('passport-facebook').Strategy

createUserFromFb = (fbProfile,access_token) ->
    ans =
        first_name: fbProfile['name']['givenName']
        last_name: fbProfile['name']['familyName']
        fb_id: fbProfile['id']
        gender: fbProfile['gender']
        fb_access_token: access_token
        isAdmin : false

facebookConf = require './settings/facebook.json'

facebookStrategyConf =
    clientID: facebookConf.app_id,
    clientSecret: facebookConf.app_secret,
    callbackURL: "YOURPUBLICURL/auth/facebook/callback"

# Add facebook auth
passport.use new FacebookStrategy facebookStrategyConf, (accessToken, refreshToken, profile, done) ->
    ensureCollection = require('./dal').ensureCollection
    # Get the users collection
    ensureCollection {db:'news', collection:'users'}, (err, collection) ->
        collection.findOne {fb_id: profile['id']}, (err,user) ->
            if err
                throw err
            if not user?
                console.log 'Creating user!'
                user = createUserFromFb profile, accessToken

                # Insert the new user
                collection.insert user, {safe:true}, (error,user) ->
                    console.log 'user inserted'
            else
                console.log 'recurring user'

            done null, user

passport.serializeUser = (user, done) ->
    done null, user

passport.deserializeUser = (obj, done) ->
    done null, obj

exports.configureExpress = (app) ->
    app.get '/auth/facebook', passport.authenticate 'facebook'
    app.get '/auth/facebook/callback', passport.authenticate 'facebook', { successRedirect: '/', failureRedirect: '/login' }
    app.get '/logout', (req, res) ->
        req.session.destroy();
        res.redirect('/');

exports.needsAdmin = (req,res,next) ->
    # Add the user from the session
    if req.user? and req.user.isAdmin
        next()
    else
        req.flash "error", "You need to be admin to access here"
        res.redirect '/login'

routes_admin_index.coffee

# Gist dont allow me, but this is under routes/admin directory
module.exports = (app,base_url) ->
    # Make sure users from here on are admin users (base_url forward)
    app.all base_url + '/*', app.info.auth.needsAdmin
    # Include the user admin pages
    require('./user')(app,base_url)
    # Include other admin modules

routes_index.coffee

# Gist dont allow me, but this is under routes directory
# configure all the pages
module.exports = (app) ->
    # Add general information to all requests
    app.all '*', (req,res,next) ->
        # Add the user from the session
        if req.user?
            res.locals.session_user = req.user
        # Add the flash messages
        res.locals.flash_messages = req.flash()

        next()

    # Include the admin plugin with the base url /admin
    require('./admin')(app,'/admin')

    # Include the rest of the pages