Using custom middleware with a express-resource

exmample.js

var resource = require('express-resource')
    , stuff = require('./resources/stuff') // the resource being wrapped..
    , _ = require('underscore')

var inject = (function(){

    if (arguments.length < 2){
        console.log(arguments.length)
        throw "Invalid arguments"
    }
    var target = arguments[0] 
    var injected = arguments[1];

    return function(){
        
        return injected.apply(injected, arguments) ||
               target.apply(target, arguments)
    }
})

// inject the middleware for all methods of the resource
function applyMiddleware(theResource, theMiddleware){

  _.each(_.keys(theResource), function(key){
    theResource[key] = inject(theResource[key], theMiddleware);
  })
  
}

// in the present form of 'inject' calling next()
// is not supported but can be simulated with
// return value.
function requiresAuthentication(req, res){

    if (! req.isAuthenticated()){
         res.redirect('/login')
         // return value == equivalent of not calling next
         return true
    }
    // undefined return value == next()
}

var app = module.exports = express.createServer();
app.configure(function(){

   // .. other configuration 
   
   // apply the middleware 
   applyMiddleware(stuff, requiresAuthentication)

   // add the resource 
   app.resource('stuff', stuff)
   
})

// That's it..