Userscript to switch Google Meet user on visiting the Meet call

switch_google_meet.js

// ==UserScript==
// @name         Switch Google Meet user on visiting the page
// @namespace    http://roszkowski.dev/
// @version      0.1
// @description  try to take over the world!
// @author       Dominik Roszkowski
// @match        *://meet.google.com/*
// @icon         https://www.google.com/s2/favicons?domain=google.com
// @grant        none
// ==/UserScript==

console.log("Hello, Let's see if we have to switch the user!");

// Set this to your desired Google user id
var authUser = 1;

var current_location = window.document.location.toString();
var loweredUrl = current_location.toLowerCase();
console.log("Lowered URL: " + loweredUrl);

var authUserExists = loweredUrl.indexOf('authuser') >= 0;
var authUserIsSame = loweredUrl.indexOf('authuser=' + authUser) >= 0;

console.log("authUserExists: " + authUserExists);
console.log("authUserIsSame: " + authUserIsSame);

var shouldRedirect = ( !authUserExists || (!authUserIsSame) ) && parseInt(authUser) > 0;

console.log("shouldRedirect: " + shouldRedirect);

var isRedirectUriCorrect = ( /meet.google.com\/.*-.*-.*/.test(loweredUrl) || loweredUrl === 'https://meet.google.com/' || 'https://meet.google.com/landing' || 'https://meet.google.com/new' );

console.log("isRedirectUriCorrect: " + isRedirectUriCorrect);

if ( shouldRedirect && isRedirectUriCorrect ) {
    var _redirectUrl = loweredUrl;

    var params = new URLSearchParams(_redirectUrl.split('?')[1]);

    for (var pair of params.entries()) {
        if( pair[0].toLowerCase() === "authuser" ) {
            params.delete(pair[0]);
        }
    }

    params.set('authuser', authUser);

    _redirectUrl = _redirectUrl.split('?')[0] + "?" + params.toString();

    console.log("Redirecting to : " + _redirectUrl);
    window.location.replace(_redirectUrl);
}