// certbot_webroot.js
// writted by Benoit LORAND <benoit.lorand@blorand.org>
//
// webservice help certbot when using webroot
// Could be behind a reverse proxy (Apache, Nginx, haproxy) who do basic authentication
//
// inspired from https://stackoverflow.com/questions/16333790/node-js-quick-file-server-static-files-over-http
//
"use strict";
const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
const port = Number(process.env.NODE_PORT) || 9000;
const listenip = process.env.NODE_LISTEN_IP || '127.0.0.1';
const base_dir = './data';

http.createServer(function (req, res) {

  // parse URL
  const parsedUrl = url.parse(req.url);
  // extract URL path
  let pathname = `${parsedUrl.pathname}`;
  // based on the URL path, extract the file extention. e.g. .js, .doc, ...
  const ext = path.parse(pathname).ext;
  // maps file extention to MIME typere
  const map = {
    '.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'
  };

  fs.exists(base_dir + pathname, function (exist) {
    if(!exist) {
      // if the file is not found, return 404
      console.log(`certbot_validation_fqdn : ${req.method} ${req.url} - 404`);
      res.statusCode = 404;
      res.end(`File ${pathname} not found!`);
      return;
    }

    // if is a directory search for index file matching the extention
    if (fs.statSync(base_dir + pathname).isDirectory()) pathname += '/index' + ext;

    // read file from file system
    fs.readFile(base_dir + pathname, function(err, data){
      if(err){
        console.log(`certbot_validation_fqdn : ${req.method} ${req.url} - 500`);
        res.statusCode = 500;
        res.end(`Error getting the file: ${err}.`);
      } else {
        // if the file is found, set Content-type and send data
        console.log(`certbot_validation_fqdn : ${req.method} ${req.url} - 200`);
        res.setHeader('Content-type', map[ext] || 'text/plain' );
        res.end(data);
      }
    });
  });


}).listen(parseInt(port, listenip));

console.log(`Server listening on port ${listenip}:${port}`);