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index.js
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index.js
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'use strict';
var net = require('net');
var fs = require('fs');
var path = require('path');
var server = net.createServer();
var lock = {};
server.listen(9999, '127.0.0.1');//Listen on IP, PORT
server.on('connection', handle);//Handle on connection event
function getFilesList(dir){
var files = [];
fs.readdirSync(dir).forEach(
file => {
if(fs.lstatSync(dir+file).isFile()){
files.push(file);
}
}
);
return JSON.stringify(files);
}
function handle(socket) {
//Received Data from the socket
socket.on('data', (data) => {
var request = data.toString().trim();
//Process the request
parseRequest(request, function (options) {
if(lock[options.path] !== "none" && lock[options.path] !== undefined){
var temp = `<h1>Somebody is ${lock[options.path]} to the file requested. Please try again later</h1>`;
socket.write(`${options['http']} 423 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: ${temp.length}\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write(temp);
socket.end();
}
else if (options['path'].match(/\//g).length > 1) {//Trying to access a directory not allowed /public/
socket.write(`${options['http']} 404 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 19\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Wrong URL!</h1>');
socket.end();
}
else if (options['method'] === 'post') {
if (options.path === '/' || options.path === '') {
socket.write(`${options['http']} 400 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 54\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Bad request, You have to specify a file name!</h1>');
socket.end();
}
else {
var body = '';
if (options['content-length'] !== undefined) {//Parse content length
if (request.split('\r\n\r\n')[1] !== undefined) {
body = request.split('\r\n\r\n')[1].substring(0, parseInt(options['content-length']));
}
fs.open('./public' + options.path, 'r', function (err, file) {
if (!err) {
lock[options.path] = "Writing";
fs.writeFile('./public/' + options.path, body, function (err) {
if (err) {
socket.write(`${options['http']} 500 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 27\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Error writing file</h1>');
socket.end();
}
else {
socket.write(`${options['http']} 200 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 27\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Content overwrited</h1>');
socket.end();
}
});
lock[options.path] = "none";
}
else {
fs.writeFile('./public' + options.path, body, function (err) {
lock[options.path] = "Writing";
if (err) {
socket.write(`${options['http']} 500 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 27\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Error writing file</h1>');
socket.end();
}
else {
socket.write(`${options['http']} 201 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 25\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>New File Created</h1>');
socket.end();
}
lock[options.path] = "none";
});
}
});
}
else {
socket.write(`${options['http']} 411 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 37\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Bad request. Unknown Content</h1>');
socket.end();
}
}
}
else if (options['method'] === 'get') {
if (options.path === '/' || options.path === '') {//Get / return the list of available files
var filesList = '';
filesList = getFilesList('./public/');
socket.write(`${options['http']} 200 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: ${filesList.length}\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write(filesList);
socket.end();
}
else {
//Try to open file for reading
fs.open('./public' + options.path, 'r', function (err, file) {
if (!err) {//Return the content of the file if exists
lock[options.path] = "Reading";
fs.readFile(file, { encoding: 'utf-8' }, function (err, data) {
socket.write(`${options['http']} 200 OK\r\n`);
socket.write(`Content-Type: ${options['accept']}\r\n`);
//Content disposition header
socket.write(`Content-Disposition: attachment; filename=${path.basename(options.path)}\r\n`);
socket.write(`Content-Length: ${data.length}\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write(`${data}`);
socket.end();
lock[options.path] = "none";
});
}
else {//File not found
socket.write(`${options['http']} 404 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 24\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>File Not Found!</h1>');
socket.end();
}
});
}
}
else {//Other methods not allowed
socket.write(`${options['http']} 405 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 27\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Method Not Allowed</h1>');
socket.end();
}
});
});
//Parse request method, path, http version, headers
function parseRequest(req, callback) {
var arr = req.split("\r\n");
var firstLine = arr[0].split(' ');
var options = {};
options['method'] = firstLine[0].toLowerCase();
options['path'] = firstLine[1].toLowerCase();
options['http'] = firstLine[2];
var temp;
for (var i = 1; i < arr.length; i++) {
temp = arr[i].trim().split(':');
if (temp.length > 1) {
options[`${temp[0].trim().toLowerCase()}`] = temp[1].trim().toLowerCase();
}
}
callback(options);
}
socket.on('end', () => {
});
socket.on('close', () => {
});
socket.on('error', () => {
socket.write(`${options['http']} 405 OK\r\n`);
socket.write('Content-Type: text/html\r\n');
socket.write(`Content-Length: 15\r\n\r\n`);//Two CR LF End of headers, the following is the body
socket.write('<h1>Error!</h1>');
socket.end();
});
}