fs, url, http, nodejs

4.js

var http = require('http');
var url = require('url');
var port = 3000;
var fs = require('fs');
var path = require('path');
var mimes = {
	'.html': 'text/html',
	'.css': 'text/css',
	'.js': 'text/javascript',
	'.gif': 'image/gif',
	'.jpg': 'image/jpeg',
	'.png': 'image/png'
}

function fileAccess(filePath){
	return new Promise(function(resolve, reject){
			fs.access(filepath, fs.F_OK, function(err){
				if(!err){
					resolve(filePath);
				}
				else {
					reject(error);
				}
			});
	});
}

function fileReader(filePath) {
	return new Promise(function(resolve, reject){
		fs.readFile(filePath, function(err, content){
			if(!err){
				resolve(content)
			}	
			else {
				reject(err);
			}
		});
	});
}

function creaciondelServer(req, res){
	console.log(url);
	var baseURI = url.parse(req.url);
	var filePath = __dirname + (baseURI.pathname  === '/' ? '/index.html' : baseURI.pathname);

	fileAccess(filePath).then(fileReader).then(function content(){
		res.writeHead(200, {'Content-type': contentType});
		res.end(content, 'utf-8');
	})
	.catch(function err(){
		res.writeHead(500);
		res.end(JSON.stringify(err));
	});

	console.log(filePath);
	console.log('soy pathname ' + JSON.stringify(baseURI));

	//dirname nos brinda la url de nuestro directory
	console.log('__dirname: ' + __dirname);
	//process.cdw() functio nos brinda la url de nuestro directory
	console.log('process.cwd() ' + process.cwd());

}

http.createServer(creaciondelServer).listen(port, function(){
	console.log('corriendo server ' + port);
});