1 files changed, 40 insertions, 0 deletions
diff --git a/toolkit/components/extensions/storage/ExtensionStorageComponents.h b/toolkit/components/extensions/storage/ExtensionStorageComponents.h
new file mode 100644
index 0000000000..53af177432
--- /dev/null
+++ b/toolkit/components/extensions/storage/ExtensionStorageComponents.h
@@ -0,0 +1,40 @@
+/* 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_extensions_storage_ExtensionStorageComponents_h_
+#define mozilla_extensions_storage_ExtensionStorageComponents_h_
+
+#include "mozIExtensionStorageArea.h"
+#include "nsCOMPtr.h"
+
+extern "C" {
+
+// Implemented in Rust, in the `webext_storage_bridge` crate.
+nsresult NS_NewExtensionStorageSyncArea(mozIExtensionStorageArea** aResult);
+
+}  // extern "C"
+
+namespace mozilla {
+namespace extensions {
+namespace storage {
+
+// The C++ constructor for a `storage.sync` area. This wrapper exists because
+// `components.conf` requires a component class constructor to return an
+// `already_AddRefed<T>`, but Rust doesn't have such a type. So we call the
+// Rust constructor using a `nsCOMPtr` (which is compatible with Rust's
+// `xpcom::RefPtr`) out param, and return that.
+already_AddRefed<mozIExtensionStorageArea> NewSyncArea() {
+  nsCOMPtr<mozIExtensionStorageArea> storage;
+  nsresult rv = NS_NewExtensionStorageSyncArea(getter_AddRefs(storage));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+  return storage.forget();
+}
+
+}  // namespace storage
+}  // namespace extensions
+}  // namespace mozilla
+
+#endif  // mozilla_extensions_storage_ExtensionStorageComponents_h_