1 files changed, 51 insertions, 0 deletions
diff --git a/dom/base/BindContext.cpp b/dom/base/BindContext.cpp
new file mode 100644
index 0000000000..a4088ff174
--- /dev/null
+++ b/dom/base/BindContext.cpp
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include "mozilla/dom/BindContext.h"
+#include "mozilla/dom/BrowsingContext.h"
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/StaticPrefs_browser.h"
+#include "nsContentUtils.h"
+#include "nsError.h"
+#include "nsPIDOMWindow.h"
+
+namespace mozilla::dom {
+
+bool BindContext::AllowsAutoFocus() const {
+  if (!StaticPrefs::browser_autofocus()) {
+    return false;
+  }
+  if (!InUncomposedDoc()) {
+    return false;
+  }
+  if (mDoc.IsBeingUsedAsImage()) {
+    return false;
+  }
+  return IsSameOriginAsTop();
+}
+
+bool BindContext::IsSameOriginAsTop() const {
+  BrowsingContext* browsingContext = mDoc.GetBrowsingContext();
+  if (!browsingContext) {
+    return false;
+  }
+
+  nsPIDOMWindowOuter* topWindow = browsingContext->Top()->GetDOMWindow();
+  if (!topWindow) {
+    // If we don't have a DOMWindow, We are not in same origin.
+    return false;
+  }
+
+  Document* topLevelDocument = topWindow->GetExtantDoc();
+  if (!topLevelDocument) {
+    return false;
+  }
+
+  return NS_SUCCEEDED(nsContentUtils::CheckSameOrigin(topLevelDocument, &mDoc));
+}
+
+}  // namespace mozilla::dom