I have STOMP client written on JS, which have this code:

function connect() {
    var socket = new SockJS('/our-websocket');
    stompClient = Stomp.over(socket);
    stompClient.connect({}, function (frame) {
        console.log('Connected: ' + frame);
        stompClient.subscribe('/user/topic/private-messages', function (message) {
            showMessage(JSON.parse(message.body).content);
        });
    });
}

Is any way to send username as parameter / attribute on subscribe? Now I have DefaultHandshakeHandler implementation with determineUser() method:

override fun determineUser(
    request: ServerHttpRequest,
    wsHandler: WebSocketHandler,
    attributes: MutableMap<String, Any>
): Principal? {
    return super.determineUser(request, wsHandler, attributes)
}

This method calls when JS stompClient subscribes topic. Have any idea how to read username from it, or, maybe, any most popular way exists?