Cleanup JS just a bit

- Remove ability to connect to arbitrary hosts and ports
  via query params. We already required websockify anyway, so
  this never worked. Plus, we only care about using the viewer for
  our own purposes, not as a general purpose novnc thing
- Get rid of the ctrlAltDelete function. It's not particularly useful
  in this context. I will work on adding more UI here, but this
  location is a good place for other buttons

js/index.js

@@ -24,100 +24,29 @@ function disconnectedFromServer(e) {
   }
 }
 
-// When this function is called, the server requires
-// credentials to authenticate
-function credentialsAreRequired(e) {
-  const password = prompt("Password Required:");
-  rfb.sendCredentials({ password: password });
-}
-
 // When this function is called we have received
 // a desktop name from the server
 function updateDesktopName(e) {
   desktopName = e.detail.name;
 }
 
-// Since most operating systems will catch Ctrl+Alt+Del
-// before they get a chance to be intercepted by the browser,
-// we provide a way to emulate this key sequence.
-function sendCtrlAltDel() {
-  rfb.sendCtrlAltDel();
-  return false;
-}
-
 // Show a status text in the top bar
 function status(text) {
   document.getElementById("status").textContent = text;
 }
 
-// This function extracts the value of one variable from the
-// query string. If the variable isn't defined in the URL
-// it returns the default value instead.
-function readQueryVariable(name, defaultValue) {
-  // A URL with a query parameter can look like this:
-  // https://www.example.com?myqueryparam=myvalue
-  //
-  // Note that we use location.href instead of location.search
-  // because Firefox < 53 has a bug w.r.t location.search
-  const re = new RegExp(".*[?&]" + name + "=([^&#]*)"),
-    match = document.location.href.match(re);
-
-  if (match) {
-    // We have to decode the URL since want the cleartext value
-    return decodeURIComponent(match[1]);
-  }
-
-  return defaultValue;
-}
-
-document.getElementById("sendCtrlAltDelButton").onclick = sendCtrlAltDel;
-
-// Read parameters specified in the URL query string
-// By default, use the host and port of server that served this file
-const host = readQueryVariable("host", window.location.hostname);
-let port = readQueryVariable("port", window.location.port);
-const password = readQueryVariable("password");
-
-const path = readQueryVariable(
-  "path",
-  window.location.pathname.replace(/[^/]*$/, "").substring(1) + "websockify",
-);
-
-// | | |         | | |
-// | | | Connect | | |
-// v v v         v v v
-
-status("Connecting");
-
-// Build the websocket URL used to connect
-let url;
-if (window.location.protocol === "https:") {
-  url = "wss";
-} else {
-  url = "ws";
-}
-url += "://" + host;
-if (port) {
-  url += ":" + port;
-}
-url += "/" + path;
+// Construct the websockify websocket URL we want to connect to
+let websockifyUrl = new URL("websockify", window.location);
+websockifyUrl.protocol = window.location.protocol === "https" ? "wss" : "ws";
 
 // Creating a new RFB object will start a new connection
-rfb = new RFB(document.getElementById("screen"), url, {
-  credentials: { password: password },
-});
+rfb = new RFB(document.getElementById("screen"), websockifyUrl.toString(), {});
 
 // Add listeners to important events from the RFB module
 rfb.addEventListener("connect", connectedToServer);
 rfb.addEventListener("disconnect", disconnectedFromServer);
-rfb.addEventListener("credentialsrequired", credentialsAreRequired);
 rfb.addEventListener("desktopname", updateDesktopName);
 
-// Set parameters that can be changed on an active connection
-rfb.viewOnly = readQueryVariable("view_only", false);
-
-rfb.scaleViewport = readQueryVariable("scale", true);
-
 // Clipboard
 function toggleClipboardPanel() {
   document

jupyter_remote_desktop_proxy/static/index.html

@@ -30,8 +30,6 @@
           <textarea id="noVNC_clipboard_text" rows="5"></textarea>
         </div>
       </div>
-
-      <div id="sendCtrlAltDelButton">Send CtrlAltDel</div>
     </div>
     <div id="screen">
       <!-- This is where the remote screen will appear -->