gistfile1.txt

var app = express.createServer();

var publicPath = './public';
var adminPath = './admin';

app.use(express.static( path.resolve( publicPath ) ) );

app.use(function(req,res,next){
  // if req.path starts with /admin/ and user is logged in call next
  // else redirect to login page
  var userIsLoggedIn = true; // check session etc.
  if( req.path.indexOf('/admin/') == 0 && userIsLoggedIn ) {
     next();
  } else {
     // ask user for login
  }
});

app.use('/admin',express.static( path.resolve( adminPath ) ) );

app.listen(3000);

...
app.use(express.static( path.resolve( publicPath ) ) );

app.use(function(req, res, next) {
if(req.path.indexOf('/admin') === 0) {
if(req.session && req.session.user) {
next();
} else {
console.log('login failed');
res.redirect('/#login');
}
} else {
//somehow it should skip here the app.use('/admin', express.static('./admin')); line.....
}
});
app.use('/admin',express.static( path.resolve( adminPath ) ) );
...