test_nuke_sandbox_event_listeners.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// See https://bugzilla.mozilla.org/show_bug.cgi?id=1273251

function promiseEvent(target, event) {

  return new Promise(resolve => {

    target.addEventListener(event, resolve, {capture: true, once: true});

});

add_task(async function() {

  let principal = Services.scriptSecurityManager

    .createContentPrincipalFromOrigin("http://example.com/");

  let webnav = Services.appShell.createWindowlessBrowser(false);

  let docShell = webnav.docShell;

  docShell.createAboutBlankDocumentViewer(principal, principal);

  let window = webnav.document.defaultView;

  let sandbox = Cu.Sandbox(window, {sandboxPrototype: window});

  function sandboxContent() {

    window.onload = function SandboxOnLoad() {};

    window.addEventListener("FromTest", () => {

      window.dispatchEvent(new CustomEvent("FromSandbox"));

    }, true);

  Cu.evalInSandbox(`(${sandboxContent})()`, sandbox);

  let fromTestPromise = promiseEvent(window, "FromTest");

  let fromSandboxPromise = promiseEvent(window, "FromSandbox");

  equal(typeof window.onload, "function",

        "window.onload should contain sandbox event listener");

  equal(window.onload.name, "SandboxOnLoad",

        "window.onload have the correct function name");

  info("Dispatch FromTest event");

  window.dispatchEvent(new window.CustomEvent("FromTest"));

  await fromTestPromise;

  info("Got event from test");

  await fromSandboxPromise;

  info("Got response from sandbox");

  window.addEventListener("FromSandbox", () => {

    ok(false, "Got unexpected reply from sandbox");

  }, true);

  info("Nuke sandbox");

  Cu.nukeSandbox(sandbox);

  info("Dispatch FromTest event");

  fromTestPromise = promiseEvent(window, "FromTest");

  window.dispatchEvent(new window.CustomEvent("FromTest"));

  await fromTestPromise;

  info("Got event from test");

  // Force cycle collection, which should cause our callback reference

  // to be dropped, and dredge up potential issues there.

  Cu.forceGC();

  Cu.forceCC();

  ok(Cu.isDeadWrapper(window.onload),

     "window.onload should contain a dead wrapper after sandbox is nuked");

  info("Dispatch FromTest event");

  fromTestPromise = promiseEvent(window, "FromTest");

  window.dispatchEvent(new window.CustomEvent("FromTest"));

  await fromTestPromise;

  info("Got event from test");

  let listeners = Services.els.getListenerInfoFor(window);

  ok(!listeners.some(info => info.type == "FromTest"),

     "No 'FromTest' listeners returned for nuked sandbox");

  webnav.close();

});