app.js

const express_app = require("./backend/server.js");
//const contr_lang = require('./backend/controller/language.js');
const routes = require("./backend/controller/routes.js");

//Setup everything **********************************
setup_routes();

/** React to pre-configured routes (from routes.js) */
function setup_routes() {
  let setup_route = function(key, methods) {
    /*key is the address of the url -> e.g. /, or /about
     * while value is an object which can consist of following
     * parts:
     *
     * {
     * "post":func, "get":func, "delete":func, "put":func
     * }
     *
     * No method must be provided for an uri. */

    let evaluate_route = function(method_name, method_func) {
      console.log(
        "app:evaluate_route: Setting up route -> " + key + " : " + method_name
      );
      switch (method_name.toLowerCase()) {
        case "post":
          express_app.post(key, method_func);
          break;
        case "get":
          express_app.get(key, method_func);
          break;
        case "delete":
          express_app.delete(key, method_func);
          break;
        case "put":
          express_app.put(key, method_func);
          break;
        default:
          console.error(
            "app:setup_routes: HTTP-method not found -> " +
              method_name.toLowerCase()
          );
      }
    };

    Object.entries(methods).forEach(([method_name, method_func]) =>
      evaluate_route(method_name, method_func)
    );
  };

  //for each object in routes (which consists multiple http methods)
  Object.entries(routes).forEach(([key, methods]) => setup_route(key, methods));
}