Bug 1669961: Return null from `.contentWindow` when inner window is inactive. r=nika

Differential Revision: https://phabricator.services.mozilla.com/D93853

devtools/shared/resources/tests/browser_target_list_service_workers_navigation.js

@@ -360,10 +360,14 @@ async function unregisterServiceWorker(tab, expectedPageUrl) {
 async function waitForRegistrationReady(tab, expectedPageUrl) {
   await asyncWaitUntil(() =>
     SpecialPowers.spawn(tab.linkedBrowser, [expectedPageUrl], function(_url) {
-      const win = content.wrappedJSObject;
-      const isExpectedUrl = win.location.href === _url;
-      const hasRegistration = !!win.registration;
-      return isExpectedUrl && hasRegistration;
+      try {
+        const win = content.wrappedJSObject;
+        const isExpectedUrl = win.location.href === _url;
+        const hasRegistration = !!win.registration;
+        return isExpectedUrl && hasRegistration;
+      } catch (e) {
+        return false;
+      }
     })
   );
 }

docshell/test/navigation/browser_test_bfcache_eviction.js

@@ -31,7 +31,6 @@ add_task(async function() {
                 "History listener got called after a content viewer was evicted"
               );
               legacySHistory.removeSHistoryListener(historyListener);
-              delete content._testListener;
               // 6. Resolve the promise when we got our 'content viewer evicted' event
               resolve();
             },

dom/ipc/jsactor/JSWindowActorChild.cpp

@@ -125,9 +125,17 @@ nsIDocShell* JSWindowActorChild::GetDocShell(ErrorResult& aRv) {
 
 Nullable<WindowProxyHolder> JSWindowActorChild::GetContentWindow(
     ErrorResult& aRv) {
-  if (BrowsingContext* bc = GetBrowsingContext(aRv)) {
-    return WindowProxyHolder(bc);
+  if (!mManager) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
   }
+
+  if (nsGlobalWindowInner* window = mManager->GetWindowGlobal()) {
+    if (window->IsCurrentInnerWindow()) {
+      return WindowProxyHolder(window->GetBrowsingContext());
+    }
+  }
+
   return nullptr;
 }
 

dom/ipc/tests/JSWindowActor/browser.ini

@@ -2,6 +2,7 @@
 support-files =
   head.js
 
+[browser_contentWindow.js]
 [browser_crash_report.js]
 [browser_destroy_callbacks.js]
 skip-if = !debug && (os == 'mac') #Bug 1604538

dom/ipc/tests/JSWindowActor/browser_contentWindow.js

@@ -0,0 +1,47 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+declTest("contentWindow null when inner window inactive", {
+  matches: [TEST_URL + "*"],
+  url: TEST_URL + "?1",
+
+  async test(browser) {
+    {
+      let parent = browser.browsingContext.currentWindowGlobal;
+      let actorParent = parent.getActor("TestWindow");
+
+      await actorParent.sendQuery("storeActor");
+    }
+
+    {
+      let url = TEST_URL + "?2";
+      let loaded = BrowserTestUtils.browserLoaded(browser, false, url);
+      await BrowserTestUtils.loadURI(browser, url);
+      await loaded;
+    }
+
+    let parent = browser.browsingContext.currentWindowGlobal;
+    let actorParent = parent.getActor("TestWindow");
+
+    let result = await actorParent.sendQuery("checkActor");
+    if (SpecialPowers.useRemoteSubframes) {
+      is(
+        result.status,
+        "error",
+        "Should get an error when bfcache is disabled for Fission"
+      );
+      is(
+        result.errorType,
+        "InvalidStateError",
+        "Should get an InvalidStateError without bfcache"
+      );
+    } else {
+      is(result.status, "success", "Should succeed when bfcache is enabled");
+      ok(
+        result.valueIsNull,
+        "Should get a null contentWindow when inner window is inactive"
+      );
+    }
+  },
+});

dom/ipc/tests/JSWindowActor/browser_sendQuery.js

@@ -35,7 +35,7 @@ declTest("sendQuery Error", {
     is(error.name, "SyntaxError", "Error should have the correct name");
     is(
       error.stack,
-      "receiveMessage@resource://testing-common/TestWindowChild.jsm:33:31\n" +
+      "receiveMessage@resource://testing-common/TestWindowChild.jsm:35:31\n" +
         asyncStack,
       "Error should have the correct stack"
     );
@@ -63,7 +63,7 @@ declTest("sendQuery Exception", {
     );
     is(
       error.stack,
-      "receiveMessage@resource://testing-common/TestWindowChild.jsm:36:22\n" +
+      "receiveMessage@resource://testing-common/TestWindowChild.jsm:38:22\n" +
         asyncStack,
       "Error should have the correct stack"
     );

layout/base/tests/browser_disableDialogs_onbeforeunload.js

@@ -50,9 +50,10 @@ async function openPage(enableDialogs) {
         const { Services } = ChromeUtils.import(
           "resource://gre/modules/Services.jsm"
         );
+        let win = content;
         Services.obs.addObserver(doc => {
-          if (content && doc == content.document) {
-            content.windowUtils[name]();
+          if (doc == win.document) {
+            win.windowUtils[name]();
           }
         }, "document-element-inserted");
       });

toolkit/actors/TestWindowChild.jsm

@@ -8,6 +8,8 @@ const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 var EXPORTED_SYMBOLS = ["TestWindowChild"];
 
+var docShellThunks = new Map();
+
 class TestWindowChild extends JSWindowActorChild {
   constructor() {
     super();
@@ -41,6 +43,31 @@ class TestWindowChild extends JSWindowActorChild {
       case "noncloneReply":
         // Return a value which is non-cloneable, like a WindowProxy.
         return this.contentWindow;
+      case "storeActor":
+        docShellThunks.set(this.docShell, this);
+        break;
+      case "checkActor": {
+        let actor = docShellThunks.get(this.docShell);
+        docShellThunks.delete(this.docShell);
+
+        let contentWindow;
+        let error;
+        try {
+          contentWindow = actor.contentWindow;
+        } catch (e) {
+          error = e;
+        }
+        if (error) {
+          return {
+            status: "error",
+            errorType: error.name,
+          };
+        }
+        return {
+          status: "success",
+          valueIsNull: contentWindow === null,
+        };
+      }
     }
 
     return undefined;

toolkit/components/passwordmgr/test/browser/browser_doorhanger_generated_password.js

@@ -267,10 +267,10 @@ async function submitForm(browser) {
   await SpecialPowers.spawn(browser, [], async function() {
     content.document.querySelector("form").submit();
 
+    let win = content;
     await ContentTaskUtils.waitForCondition(() => {
       return (
-        content.location.pathname == "/" &&
-        content.document.readyState == "complete"
+        win.location.pathname == "/" && win.document.readyState == "complete"
       );
     }, "Wait for form submission load");
   });

toolkit/components/passwordmgr/test/browser/browser_doorhanger_toggles.js

@@ -457,10 +457,11 @@ async function submitForm(browser, action = "") {
     info("Submitting form to:" + form.action);
     form.submit();
 
+    let win = content;
     await ContentTaskUtils.waitForCondition(() => {
       return (
-        content.location.pathname == actionPathname &&
-        content.document.readyState == "complete"
+        win.location.pathname == actionPathname &&
+        win.document.readyState == "complete"
       );
     }, "Wait for form submission load");
   });