https://www.studentengoedverzekerd.nl/sc-proxy/layouts/system/VisitorIdentification.js

1function subscribeEvent(event, listener, useCapture) {
2    if (document.addEventListener) {
3        document.addEventListener(event, listener, useCapture);
4    } else if (document.attachEvent) {
5        document.attachEvent(event, listener, useCapture);
6    }
7}
8
9function unsubscribeEvent(event, listener, useCapture) {
10    if (document.removeEventListener) {
11        document.removeEventListener(event, listener, useCapture);
12    } else if (document.detachEvent) {
13        document.detachEvent(event, listener, useCapture);
14    }
15}
16
17function startActivityHandler(e) {
18    unsubscribeEvent("touchstart", arguments.callee, false);
19    document.documentElement.onmousemove = null; // We need it here to turn off mouse move too.
20
21    if (true) {
22        timeoutSleep(0, placeCssAspxRequest);
23    }
24};
25
26document.documentElement.onmousemove = startActivityHandler;
27subscribeEvent("touchstart", startActivityHandler, false);
28
29function placeCheckerRequest() {
30    var stt1 = '/sc-proxy/layouts/system';
31    var stt2 = '/VIChecker.aspx?tstamp=';
32    var stt3 = getMetatagContent();
33
34    var fileref = document.createElement('link');
35    fileref.setAttribute('rel', 'stylesheet');
36    fileref.setAttribute('type', 'text/css');
37    fileref.setAttribute('href', stt1 + stt2 + stt3);
38    document.getElementsByTagName("head")[0].appendChild(fileref);
39}
40
41function placeCssAspxRequest() {
42    st1 = '/sc-proxy/layouts/system/Visitor';
43    st2 = 'Identification';
44    st3 = 'CSS.aspx?' + new Date().getTime();
45
46    var fileref = document.createElement('link');
47    fileref.setAttribute('rel', 'stylesheet');
48    fileref.setAttribute('type', 'text/css');
49    fileref.setAttribute('href', st1 + st2 + st3);
50    document.getElementsByTagName("head")[0].appendChild(fileref);
51
52    timeoutSleep(30000, placeCheckerRequest);
53}
54
55function timeoutSleep(milliseconds, callbackFunction) {
56    window.setTimeout(
57        function() {
58            callbackFunction();
59        },
60        milliseconds);
61}
62
63function getMetatagContent() {
64    var metas = document.getElementsByTagName('meta');
65
66    for (var i = 0; i < metas.length; i++) {
67        if (metas[i].getAttribute("name") == "VIcurrentDateTime") {
68            return metas[i].getAttribute("content");
69        }
70    }
71
72    return "";
73}