test_getUserMedia_scarySources.html

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<!DOCTYPE HTML>

<html>

<head>

  <script type="application/javascript" src="mediaStreamPlayback.js"></script>

</head>

<body>

<pre id="test">

<script type="application/javascript">

createHTML({title: "Detect screensharing sources that are firefox", bug: "1311048"});

const Services = SpecialPowers.Services;

let observe = topic => new Promise(r => Services.obs.addObserver(function o(...args) {

  Services.obs.removeObserver(o, topic);

  r(args.map(x => SpecialPowers.wrap(x)));

}, topic));

let getDevices = async constraints => {

  SpecialPowers.wrap(document).notifyUserGestureActivation();

  let [{ windowID, innerWindowID, callID, devices }] = await Promise.race([

    getUserMedia(constraints),

    observe("getUserMedia:request")

]);

  let window = Services.wm.getOuterWindowWithId(windowID);

  return devices.map(SpecialPowers.wrapCallback(d => d.QueryInterface(Ci.nsIMediaDevice)));

};

runTest(async () => {

  await pushPrefs(["media.navigator.permission.disabled", true],

                  ["media.navigator.permission.force", true]);

  let devices = await getDevices({video: { mediaSource: "window" }});

  ok(devices.length, "Found one or more windows.");

  devices = Array.prototype.filter.call(devices, d => d.scary);

  ok(devices.length, "Found one or more scary windows (our own counts).");

  devices = devices.filter(d => d.rawName.includes("MochiTest"));

  ok(devices.length,

     "Our own window is among the scary: "

     + devices.map(d => `"${d.rawName}"`));

  devices = await getDevices({video: { mediaSource: "screen" }});

  let numScreens = devices.length;

  ok(numScreens, "Found one or more screens.");

  devices = Array.prototype.filter.call(devices, d => d.scary);

  is(devices.length, numScreens, "All screens are scary.");

});

</script>

</pre>

</body>

</html>