getAuthCode.js: get the magister website authCode by sort of imitating the web client

getAuthCode.js

/*
 * Copyright (c) 2021 Antoni Spaanderman
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

const https = require("https");

function get(path) {
	return new Promise(r => {
		const req = https.request({
			hostname: 'accounts.magister.net',
			port:      443,
			path:      path,
			method:   'GET'
		}, res => {
			var data = "";
			res.on('data', chunk => { data += chunk; });
			res.on('end', () => { r({data, res}); });
		})

		req.on('error', error => {
			console.error(error);
		});

		req.end();
	});
}

async function getAuthCode() {
	const sessionIdUrl = (await get('/Account/Login?ReturnUrl=%2Fconnect%2Fauthorize%2Fcallback%3Fclient_id%3DM6-marnix.magister.net%26redirect_uri%3Dhttps%253A%252F%252Fmarnix.magister.net%252Foidc%252Fredirect_callback.html%26response_type%3Did_token%2520token%26scope%3Dopenid%2520profile%2520opp.read%2520opp.manage%2520attendance.overview%2520calendar.ical.user%26state%3D00000000000000000000000000000000%26nonce%3D00000000000000000000000000000000%26acr_values%3Dtenant%253Amarnix.magister.net&X-Correlation-ID=000000000000&returnUrl=%2Fconnect%2Fauthorize%3Fclient_id%3DM6-marnix.magister.net%26redirect_uri%3Dhttps%253A%252F%252Fmarnix.magister.net%252Foidc%252Fredirect_callback.html%26response_type%3Did_token%2520token%26scope%3Dopenid%2520profile%2520opp.read%2520opp.manage%2520attendance.overview%2520calendar.ical.user%26state%3D00000000000000000000000000000000%26nonce%3D00000000000000000000000000000000%26acr_values%3Dtenant%253A')).res.headers.location;
	const scriptUrl = "/" + (await get(sessionIdUrl)).data.split('script defer="defer" src="')[1].split('"')[0];
	const z = JSON.parse("[[" + (await get(scriptUrl)).data.split(/=\(.=\[/)[1].split('.map')[0] + "]");
	const authCode = z[1].map(x => z[0][parseInt(x)||0]).join("");
	return authCode;
}

exports.getAuthCode = getAuthCode;

ok nu is het een regex

now you can import this script from another file with

const { getAuthCode } = require('./getAuthCode.js');