habitica/website/src/libs/api-v3/setupRoutes.js

import fs from 'fs';
import path from 'path';
import express from 'express';
import _ from 'lodash';
const CONTROLLERS_PATH = path.join(__dirname, '/../../controllers/api-v3/');
let router = express.Router();

fs
  .readdirSync(CONTROLLERS_PATH)
  .filter(fileName => fileName.match(/\.js$/))
  .filter(fileName => fs.statSync(CONTROLLERS_PATH + fileName).isFile())
  .forEach((fileName) => {
    let controller = require(CONTROLLERS_PATH + fileName);
    
    _.each(controller, (action) => {
      let {method, url, middlewares, handler} = action;

      method = method.toLowerCase();
      router[method](url, ...middlewares, handler);
    });
  });

export default router;