1 files changed, 51 insertions, 0 deletions
diff --git a/dom/security/FramingChecker.h b/dom/security/FramingChecker.h
new file mode 100644
index 0000000000..a91c353072
--- /dev/null
+++ b/dom/security/FramingChecker.h
@@ -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/. */
+
+#ifndef mozilla_dom_FramingChecker_h
+#define mozilla_dom_FramingChecker_h
+
+#include "nsStringFwd.h"
+
+class nsIDocShell;
+class nsIChannel;
+class nsIHttpChannel;
+class nsIDocShellTreeItem;
+class nsIURI;
+class nsIContentSecurityPolicy;
+
+namespace mozilla::dom {
+class BrowsingContext;
+}  // namespace mozilla::dom
+
+class FramingChecker {
+ public:
+  // Determine if X-Frame-Options allows content to be framed
+  // as a subdocument
+  static bool CheckFrameOptions(nsIChannel* aChannel,
+                                nsIContentSecurityPolicy* aCSP,
+                                bool& outIsFrameCheckingSkipped);
+
+ protected:
+  struct XFOHeader {
+    bool ALLOWALL = false;
+    bool SAMEORIGIN = false;
+    bool DENY = false;
+    bool INVALID = false;
+  };
+
+  /**
+   * Logs to the window about a X-Frame-Options error.
+   *
+   * @param aMessageTag the error message identifier to log
+   * @param aChannel the HTTP Channel
+   * @param aURI the URI of the frame attempting to load
+   * @param aPolicy the header value string from the frame to the console.
+   */
+  static void ReportError(const char* aMessageTag, nsIHttpChannel* aChannel,
+                          nsIURI* aURI, const nsAString& aPolicy);
+};
+
+#endif /* mozilla_dom_FramingChecker_h */