WebFM/resources/js/cookieHandler.js

const getCookie = (cname) => {
    let decodedCookie = decodeURIComponent(document.cookie);
    let name          = cname + "=";
    let ca            = decodedCookie.split(';');
    for(let i = 0; i <ca.length; i++) {
        let c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}