1 files changed, 48 insertions, 0 deletions
diff --git a/dom/clients/manager/ClientPrincipalUtils.cpp b/dom/clients/manager/ClientPrincipalUtils.cpp
new file mode 100644
index 0000000000..25a25b2ee9
--- /dev/null
+++ b/dom/clients/manager/ClientPrincipalUtils.cpp
@@ -0,0 +1,48 @@
+/* -*- 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 "ClientPrincipalUtils.h"
+
+#include "mozilla/ipc/PBackgroundSharedTypes.h"
+
+namespace mozilla::dom {
+
+using mozilla::ipc::ContentPrincipalInfo;
+using mozilla::ipc::PrincipalInfo;
+
+bool ClientMatchPrincipalInfo(const PrincipalInfo& aLeft,
+                              const PrincipalInfo& aRight) {
+  if (aLeft.type() != aRight.type()) {
+    return false;
+  }
+
+  switch (aLeft.type()) {
+    case PrincipalInfo::TContentPrincipalInfo: {
+      const ContentPrincipalInfo& leftContent =
+          aLeft.get_ContentPrincipalInfo();
+      const ContentPrincipalInfo& rightContent =
+          aRight.get_ContentPrincipalInfo();
+      return leftContent.attrs() == rightContent.attrs() &&
+             leftContent.originNoSuffix() == rightContent.originNoSuffix();
+    }
+    case PrincipalInfo::TSystemPrincipalInfo: {
+      // system principal always matches
+      return true;
+    }
+    case PrincipalInfo::TNullPrincipalInfo: {
+      // null principal never matches
+      return false;
+    }
+    default: {
+      break;
+    }
+  }
+
+  // Clients (windows/workers) should never have an expanded principal type.
+  MOZ_CRASH("unexpected principal type!");
+}
+
+}  // namespace mozilla::dom