auth.rxbn.de/res/web/js/custom.js

// '/login', login user
function loginEvent() { login(); return false; } // btnEvent handling
function login() {
	let user = document.getElementById("login_user").value;
	let pass = document.getElementById("login_pass").value;

	let data = {
		"email": user,
		"password": pass
	};

	let ajax = new XMLHttpRequest();
	ajax.open("POST", "/api/login", true);
	ajax.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');
	ajax.send(JSON.stringify(data));
	ajax.onload = () => {
		let json = JSON.parse(ajax.responseText);
		let box = document.getElementById("login_msg");

		box.classList.remove("uk-hidden");
		box.classList.remove("uk-alert-success");
		box.classList.remove("uk-alert-danger");

		if(json.message && json.message == "msg.auth.login.successful") {
			setTimeout(function () {
				if(
					window.location.pathname == "/authenticate" &&
					getParameterByName("appId") &&
					getParameterByName("redirectUrl")
				) window.location.reload();
				else window.location.href = "./";
			}, 150);

			box.classList.add("uk-alert-success");
			box.getElementsByTagName("p")[0].innerHTML = "Logged in. You will be redirected";
		} else if(json.message && json.message == "msg.auth.login.failed") {
			box.classList.add("uk-alert-danger");
			box.getElementsByTagName("p")[0].innerHTML = "Login failed.<br> Username or Password is wrong.";
		}
	};
};

// '/logout', logout user
function logout() {
	let ajax = new XMLHttpRequest();
	ajax.open("GET", "/api/logout", true);
	ajax.setRequestHeader('Content-Type', 'charset=UTF-8');
	ajax.send("");
	ajax.onload = () => {
		let json = JSON.parse(ajax.responseText);
		if(json.message && json.message == "msg.auth.logout.successful") window.location.href = "./";
	};
}
setTimeout(function () {
	if(document.getElementById("listener_logout")) {
		logout();
	}
}, 100);

// '/authenticate', cancels Authentication
function cancelRequest() {
	let ajax = new XMLHttpRequest();
	ajax.open("GET", "/api/cancel", true);
	ajax.setRequestHeader('Content-Type', 'charset=UTF-8');
	ajax.send("");
	ajax.onload = () => {
		let json = JSON.parse(ajax.responseText);
		if(json.message && json.message == "msg.request.operation.cancel.successful") window.location.href = "./";
	};
}

// @url: https://stackoverflow.com/a/901144
function getParameterByName(name) {
    let url = window.location.href;
    name = name.replace(/[\[\]]/g, '\\$&');
    var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, ' '));
}