How to structure an Express Controller Module

routes-post.js

/*
 * Module dependencies
 */

var Post = require('../models/post')
  , PostValidator = require('../validators/post-validator')
  , requiresLogin = require('../helpers/requireLogin').requiresLogin
  , marked = require('marked');



module.exports = function(app, repository){

    //Instantiate a new validator
    var validator = new PostValidator(repository);

    /* Params */
    app.param('slug', function(req, res, next, id){
      repository.get(id, function(error, post){
        if(error) return next(error);
        if(!post) return next(new Error('Unable to find post '+ id));
        post.body = marked(post.body);
        req.post = post;
        next();
      });
    });

    /* Routes */

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

    app.get('/post/new', requiresLogin, function(req, res){
      res.render('post/new', {title: 'Add Post'});
    });

    app.post('/post/new', requiresLogin,function(req, res){
        var post = req.body.post;
        post.username = req.user.id;
        validator.validateForm(req.body.post, function(error){
          if(error) return res.render('post/new', {title: 'Add Post', errors:error});
          var fullPost = new Post(post.title, post.body, post.username);
          repository.save(fullPost, function(error, data){
            if(error) return res.render('post/new', {title: 'Add Post', errors:[error]});
            res.redirect('/post/'+ data.id);
          });
        });
    });

    /*
     * GET {root}/{id of a post}
     * e.g. www.site.com/my-first-post
     */
    app.get('/post/:slug', function(req, res){
        res.render('post/view', {title:req.post.title, post:req.post});
    });



    app.get('/post/:slug/edit', requiresLogin, function(req,res){
        
    });

    app.post('/post/:slug/edit', requiresLogin, function(req,res){
        
    });
};

server.js

/**
 * Module dependencies.
 */

var express = require('express')
  , UserRepository = require('./models/dummy/userRepository')
  , PostRepository = require('./models/dummy/postRepository')
  , everyauth = require('everyauth');

var app = module.exports = express.createServer();
var userRepo = new UserRepository();
var postRepo = new PostRepository();

//Load all of our authentication handlers
require('./routes/auth')(everyauth, userRepo);

// Configuration

app.configure(function(){
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.set('view options', { pretty: true });
  app.use(express.bodyParser());
  app.use(express.cookieParser()); 
  app.use(express.methodOverride());
  app.use(express.session({secret:'5fdasd9034sfds'}));
  app.use(everyauth.middleware());
  app.use(app.router);
  app.use(express.static(__dirname + '/public'));
});

app.configure('development', function(){
  app.use(express.errorHandler({ dumpExceptions: true, showStack: true })); 
});

app.configure('production', function(){
  app.use(express.errorHandler()); 
});

// Routes

require('./routes/site')(app, postRepo);
require('./routes/posts')(app, postRepo);

//Configure everyauth view helpers
everyauth.helpExpress(app);

app.listen(process.env.PORT || 3000);
console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);