index.js

// global
var static = require('node-static')

    // static server object
  , staticServer

    // routes object
  , routes = {}

    // module
  , objToExport = {};

// set the static server
objToExport.setStaticServer = function (options) {
    return staticServer = new(static.Server)(options.root);
};

// set routes
objToExport.setRoutes = function (routesObj, callback) {

    var objRoutes = Object.keys (routesObj);
    for (var i = 0; i < objRoutes.length; ++i) {
        var route = objRoutes[i]
          , cRoute = routesObj[route]
          ;

        if (cRoute.slice(-1) !== "/") {
            delete routesObj[route];
            if (route !== "/") {
                route += "/";
            }
            routesObj[route] = cRoute;
            if (cRoute && cRoute.constructor.name === "String") {
                routesObj[route] =  {
                    url: cRoute
                }
            }
        }
    }

    // set routes object
    routes = routesObj;

    // if callback is defined, call it!
    callback ? callback(null, routes) : "";

    // also, return routes
    return routes;
};

function getRoute (url) {

    // verify if it doesn't end with '/'
    if (url.slice(-1) !== "/") {
        // if yes, add '/'
        url += "/";
    }

    // get route
    var route = routes[url];

    // and return it
    return route;
}

// route exists
// TODO Options?
objToExport.exists = function (req, res) {

    // get the route object from routes
    var route = getRoute(req.url);

    // if it exists
    if (route && route.url) {

        // return true
        return true;
    }

    // else, return false
    return false;
}

// serve
// TODO options
objToExport.serve = function (req, res, callback) {

    // force callback to be a function
    callback = callback || function () {};

    // get route
    var route = getRoute(req.url)

        // get the promise
      , promise = staticServer.serveFile(route.url, 200, {}, req, res);

    // if an error appears, callback it
    promise.on("error", callback);

    // and return the promise
    return promise;
};

// serve any file
objToExport.serveAll = function (req, res, callback) {

    // serve any file
    staticServer.serve(req, res, callback);
};

// export the module
module.exports = objToExport;