File size: 4,512 Bytes
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var request;
var interval = 1000;
var webSocketFactory = {
connect: function(url) {
var ws = new WebSocket(url);
ws.addEventListener("open", e => {
ws.close();
window.location.reload();
});
ws.addEventListener("error", e => {
if (e.target.readyState === 3) {
setTimeout(() => this.connect(url), 1000);
}
});
}
};
function getInfo() {
var url = "msg.html";
try {
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
} else {
throw "XMLHttpRequest not available!";
}
request.onreadystatechange = processInfo;
request.open("GET", url, true);
request.send();
} catch (e) {
setError("Error: " + e.message);
}
}
function getURL() {
var protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
var path = window.location.pathname.replace(/[^/]*$/, '').replace(/\/$/, '');
return protocol + "//" + window.location.host + path;
}
function redirect() {
setInfo("Connecting to VNC", true);
var wsUrl = getURL() + "/websockify";
var webSocket = webSocketFactory.connect(wsUrl);
return true;
}
function processInfo() {
try {
if (request.readyState != 4) {
return true;
}
var msg = request.responseText;
if (msg == null || msg.length == 0) {
window.location.reload();
return false;
}
var notFound = (request.status == 404);
if (request.status == 200) {
if (msg.toLowerCase().indexOf("<html>") !== -1) {
notFound = true;
} else {
setInfo(msg);
schedule();
return true;
}
}
if (notFound) {
redirect();
return true;
}
setError("Error: Received statuscode " + request.status);
return false;
} catch (e) {
setError("Error: " + e.message);
return false;
}
}
function extractContent(s) {
var span = document.createElement('span');
span.innerHTML = s;
return span.textContent || span.innerText;
};
function setInfo(msg, loading, error) {
try {
if (msg == null || msg.length == 0) {
return false;
}
var el = document.getElementById("info");
if (el.innerText == msg || el.innerHTML == msg) {
return true;
}
var spin = document.getElementById("spinner");
error = !!error;
if (!error) {
spin.style.visibility = 'visible';
} else {
spin.style.visibility = 'hidden';
}
var p = "<p class=\"loading\">";
loading = !!loading;
if (loading) {
msg = p + msg + "</p>";
}
if (msg.includes(p)) {
if (el.innerHTML.includes(p)) {
el.getElementsByClassName('loading')[0].textContent = extractContent(msg);
return true;
}
}
el.innerHTML = msg;
return true;
} catch (e) {
console.log("Error: " + e.message);
return false;
}
}
function setError(text) {
console.warn(text);
return setInfo(text, false, true);
}
function schedule() {
setTimeout(getInfo, interval);
}
function connect() {
var wsUrl = getURL() + "/status";
var ws = new WebSocket(wsUrl);
ws.onmessage = function(e) {
var pos = e.data.indexOf(":");
var cmd = e.data.substring(0, pos);
var msg = e.data.substring(pos + 2);
switch (cmd) {
case "s":
setInfo(msg);
break;
case "c":
switch (msg) {
case "vnc":
redirect();
break;
default:
console.warn("Unknown command: " + msg);
break;
}
break;
case "e":
setError(msg);
break;
default:
console.warn("Unknown event: " + cmd);
break;
}
};
ws.onclose = function(e) {
setTimeout(function() {
connect();
}, interval);
};
ws.onerror = function(e) {
ws.close();
window.location.reload();
};
}
schedule();
connect();
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