gistfile1.txt

const express = require('express');
const axios = require('axios');
const mime = require('mime');
const morgan = require('morgan');
const { URL } = require('url');

const app = express();
const port = process.env.PORT || 80;

// app.use(morgan('tiny'));

const regex = /\s+(href|src)=['"](.*?)['"]/g;

const getMimeType = (url, headers) => {
  if (url.indexOf('dashboard.oversikt.online/js?') !== -1) return 'application/javascript';
  return headers['content-type'];
  if (url.indexOf('?') !== -1) {
    // remove url query so we can have a clean extension
    url = url.split('?')[0];
  }
  return mime.getType(url) || 'text/html'; // if there is no extension return as html
};

app.get('/', (req, res) => {
  const { url } = req.query; // get url parameter
  if (!url) {
    res.type('text/html');
    return res.end('You need to specify <code>url</code> query parameter');
  }

  axios
    .get(url, { responseType: 'arraybuffer' }) // set response type array buffer to access raw data
    .then((response) => {
      let { data } = response;
      const urlMime = getMimeType(url, response.headers); // get mime type of the requested url
      //   if (urlMime.indexOf('text/html') !== -1) {
      // replace links only in html
      data = data.toString().replace(regex, (match, p1, p2) => {
        let newUrl = '';
        if (p2.indexOf('http') !== -1) {
          newUrl = p2;
        } else if (p2.substr(0, 2) === '//') {
          newUrl = 'http:' + p2;
        } else if (p2[0] === '/') {
          console.log('SLASG', p2);
          const searchURL = new URL(url);
          newUrl = searchURL.protocol + '//' + searchURL.host + p2;
          return ` ${p1}="${newUrl}"`;
        } else if (p2.indexOf('/js') !== -1) {
          console.log('CUSTOM', p2);
          const searchURL = new URL(url);
          newUrl = searchURL.protocol + '//' + searchURL.host + p2;
          return ` ${p1}="${newUrl}"`;
        } else {
          const searchURL = new URL(url);
          newUrl = searchURL.protocol + '//' + searchURL.host + p2;
        }
        console.log(p2, p2[0]);
        return ` ${p1}="${req.protocol}://${req.hostname}:${port}?url=${newUrl}"`;
      });
      //   }
      //   if (url.indexOf('dashboard.oversikt.online/js?') !== -1) {
      //     console.log('info', url, data.length);
      //   }
      res.type(urlMime);
      res.send(data);
    })
    .catch((error) => {
      console.log('ERROR', url, error.toString());
    });
});

app.listen(port, () => console.log(`Listening on port ${port}!`));