NodeJS master class - Assignment 1

nmc-assignment1.js

const http = require('http');
const url = require('url');
const StringDecoder = require('string_decoder').StringDecoder;

http.createServer((req, res) => service(req, res)).listen(4000, () => {
  console.log("The server is listening on port " + 4000)
});

const service = (req, res) => {
  const parseUrl = url.parse(req.url, true);
  const path = parseUrl.pathname.replace(/^\/+|\/+$/g, '');
  const query = parseUrl.query;
  const method = req.method.toLowerCase();
  const headers = req.headers;

  const decoder = new StringDecoder('utf-8');
  let buffer = '';
  req.on('data', data => buffer += decoder.write(data));
  req.on('end', () => {
    buffer += decoder.end();

    const handler = typeof router[path] !== 'undefined' ? router[path] : router['notFound'];
    const data = {'path': path, 'query': query, 'method': method, 'headers': headers, 'payload': buffer};
    handler(data, (statusCode, payload) => {
      statusCode = typeof statusCode === 'number' ? statusCode : 200;
      payload = typeof payload === 'object' ? payload : {};
      res.setHeader('Content-Type', 'application/json');
      res.writeHead(statusCode);
      res.end(JSON.stringify(payload));
      console.log('Returning this response: ', statusCode, payload);
    });
  });
};

const router = {
  'hello': (data, res) => res(200, {'message': 'welcome!'}),
  'notFound': (data, res) => res(404),
};