session-desktop/metrics_app.js
2019-01-16 16:18:08 +11:00

67 lines
2.2 KiB
JavaScript

const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
// you can pass the parameter in the command line. e.g. node static_server.js 3000
const port = process.argv[3] || 9000;
const hostname = process.argv[2] || 'localhost';
// maps file extention to MIME types
const mimeType = {
'.ico': 'image/x-icon',
'.html': 'text/html',
'.js': 'text/javascript',
'.json': 'application/json',
'.css': 'text/css',
'.png': 'image/png',
'.jpg': 'image/jpeg',
'.wav': 'audio/wav',
'.mp3': 'audio/mpeg',
'.svg': 'image/svg+xml',
'.pdf': 'application/pdf',
'.doc': 'application/msword',
'.eot': 'appliaction/vnd.ms-fontobject',
'.ttf': 'aplication/font-sfnt',
};
http
.createServer((req, res) => {
// console.log(`${req.method} ${req.url}`);
// parse URL
const parsedUrl = url.parse(req.url);
// extract URL path
// Avoid https://en.wikipedia.org/wiki/Directory_traversal_attack
// e.g curl --path-as-is http://localhost:9000/../fileInDanger.txt
// by limiting the path to current directory only
const sanitizePath = path
.normalize(parsedUrl.pathname)
.replace(/^(\.\.[/\\])+/, '');
let pathname = path.join(__dirname, sanitizePath);
fs.exists(pathname, exist => {
if (!exist) {
// if the file is not found, return 404
res.statusCode = 404;
res.end(`File ${pathname} not found!`);
return;
}
// if is a directory, then look for index.html
if (fs.statSync(pathname).isDirectory()) {
pathname += '/index.html';
}
// read file from file system
fs.readFile(pathname, (err, data) => {
if (err) {
res.statusCode = 500;
res.end(`Error getting the file: ${err}.`);
} else {
// based on the URL path, extract the file extention. e.g. .js, .doc, ...
const { ext } = path.parse(pathname);
// if the file is found, set Content-type and send data
res.setHeader('Content-type', mimeType[ext] || 'text/plain');
res.end(data);
}
});
});
})
.listen(parseInt(port, 10), hostname);
// eslint-disable-next-line
console.log(`metrics running on http://${hostname}:${port}/metrics.html`);