router-line-exercise

router-line-exercise.js

var http = require('http'),
  url = require('url'),
  Router = require('router-line').Router;

var router = new Router();

function send(res, status, contentType, body) {
  res.writeHead(status, { 'Content-Type': contentType });
  res.end(body);
}

/*
 * Return function.
 */
router.add('GET', '/', function (req, res) {
  res.end('index');
});

/*
 * Return string.
 */
router.add('GET', '/text', 'path');

/*
 * Return object.
 */
router.add('GET', '/object', { message: 'hello' });

/*
 * Return function with path parameters.
 */
router.add('GET', '/users/:user/apps/:app/:id', function (req, res, pathParams) {
  send(res, 200, 'application/json', JSON.stringify(pathParams));
});

/*
 * Return function with path parameters, include optional path parameters.
 */
router.add('GET', '/items/:item(/type/:type)', function (req, res, pathParams) {
  send(res, 200, 'application/json', JSON.stringify(pathParams));
});

/*
 * Path parameter with querystring
 */
router.add('GET', '/object', { message: 'hello' });

var app = http.createServer(function (req, res) {
  var uri, r, handler;

  uri = url.parse(req.url, true);
  r = router.route(req.method, uri.pathname);
  if (r) {
    req.param = function (key) {
      return r.params[key] ? r.params[key] : uri.query[key];
    }
    handler = r.value;

    if (typeof handler === 'function') {
      handler(req, res, r.params);
    } else if (typeof handler === 'string') {
      send(res, 200, 'text/plain', handler);
    } else {
      send(res, 200, 'application/json', JSON.stringify(handler));
    }
  } else {
    send(res, 404, 'application/json', JSON.stringify({ reason: 'This not the URL you are looking for' }));
  }
});
app.listen(process.env.PORT || 3000);
console.log('Server listen on port %d', app.address().port);