server.js

const express       = require('express');
const http          = require('http');
const path          = require('path');
const process       = require('child_process');
const bodyParser    = require('body-parser');
const Proxy         = require('../../lib/proxy');
const createSession = require('./create-session');
const scriptProc    = require('../../lib/processing/script');
const jsBeautify    = require('js-beautify');

const PROXY_PORT_1 = 1401;
const PROXY_PORT_2 = 1402;
const SERVER_PORT  = 1400;

function prepareUrl (url) {
    if (!/^(?:file|https?):\/\//.test(url)) {
        const matches = url.match(/^([A-Za-z]:)?(\/|\\)/);

        if (matches && matches[0].length === 1)
            url = 'file://' + url;
        else if (matches && matches[0].length > 1)
            url = 'file:///' + url;
        else
            url = 'http://' + url;
    }

    return url;
}

exports.start = (options = {}) => {
    const app       = express();
    const appServer = http.createServer({ maxHeaderSize: Proxy.MAX_REQUEST_HEADER_SIZE }, app);

    const resultOptions = Object.assign(options, {
        hostname:        'localhost',
        port1:           PROXY_PORT_1,
        port2:           PROXY_PORT_2,
        developmentMode: true,
    });

    const proxy = new Proxy();

    proxy.start(resultOptions);

    if (resultOptions.needBeautifyScripts) {
        const nativeProcessScript = scriptProc.processScript;

        scriptProc.processScript = (...args) => jsBeautify(nativeProcessScript(...args));
    }

    app.use(bodyParser.urlencoded({ extended: true }));

    app.get('*', (req, res) => {
        res.sendFile(path.resolve(__dirname, 'views/index.html'));
    });

    app.post('*', (req, res) => {
        let url = req.body.url;

        if (!url) {
            res
                .status(403)
                .sendFile(path.resolve(__dirname, 'views/403.html'));
        }
        else {
            url = prepareUrl(url);

            res
                .status(301)
                .set('referrer-policy', 'no-referrer')
                .set('location', proxy.openSession(url, createSession()))
                .end();
        }
    });

    appServer.listen(SERVER_PORT);

    console.log('Server listens on port ' + SERVER_PORT);

    process.exec('start http://localhost:' + SERVER_PORT);
};