Very simple resource-based routing thing for the new Express

resource.js

var urllib = require('url');

var VALID_PARAM = /^[a-z0-9_]+$/i;

var ACTIONS = [
  { name: "index",   verb:"get",    path: "" },
  { name: "new",     verb:"get",    path: "/new" },
  { name: "create",  verb:"post",   path: "" },
  { name: "show",    verb:"get",    path: "/:param" },
  { name: "edit",    verb:"get",    path: "/:param/edit" },
  { name: "update",  verb:"put",    path: "/:param" },
  { name: "destroy", verb:"delete", path: "/:param" },
];

function _replace_param(path, param) {
  return (path.indexOf(":param")>=0) ? path.replace(":param", ":" + param) : path;
}

function Resource(baseuri, param) {
  "use strict";

  this.baseuri = baseuri;
  this.param = param || "id";

  // Quick sanity check:
  if (!VALID_PARAM.test(this.param)) {
    throw new Error("Param `" + this.param + "` has an invalid character");
  }

  this.actions = [];
  return this;
}

ACTIONS.forEach(function (action) {
  Resource.prototype[action.name] = function () {
    var args    = Array.prototype.slice.call(arguments, 0);
    
    var config  = (args.length >= 1 && typeof args[0] === 'object') ? args.shift() : {};
    config.verb = config.verb || action.verb;
    config.path = config.path || _replace_param(action.path, this.param);
    config.middleware = args;
    
    this.actions.push(config);

    return this;
  };
});

Resource.prototype.attach = function (app) {
  var resource = this;
  this.actions.forEach(function (action) {
    var uri = resource.baseuri + action.path;
    var route = app.route(uri);
    
    // Simple validation for nicer error messages:
    if ( ! route[action.verb] ) {
      throw new Error("Express doesn't understand the `" + action.verb + "` verb");
    }
    
    route[action.verb].apply(route, action.middleware);
  });

  this.actions = [];
};

module.exports = Resource;