Meh

//TODO: Figure out how to get the `sig` parameter (signature) which looks like SHA1 or HMACSHA1 of the token..
//      Twitch Server verifies that the URL is correct by checking its signature.
function rewriteURL(uri) {
        var url = new URL(uri);
        var parameters = url.searchParams;
        if (parameters && parameters.get('token')) {
            var jso = JSON.parse(parameters.get('token'));
            if (!jso.server_ads && !jso.show_ads && jso.hide_ads) {
                return null;
            }

            jso.adblock = false;
            jso.authorization.forbidden = false;
            jso.authorization.reason = "";
            jso.hide_ads = true;
            jso.player_type = "site";
            jso.server_ads = false;
            jso.show_ads = false;
            jso.user_ip = "127.0.0.1";
            jso.modified = true;
            url.searchParams.set('token', JSON.stringify(jso));
            return url.toString();
        }
        return null;
      }