1 files changed, 41 insertions, 0 deletions
diff --git a/dom/media/gmp/CDMStorageIdProvider.h b/dom/media/gmp/CDMStorageIdProvider.h
new file mode 100644
index 0000000000..6904792607
--- /dev/null
+++ b/dom/media/gmp/CDMStorageIdProvider.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 CDMStorageIdProvider_h_
+#define CDMStorageIdProvider_h_
+
+/**
+ * CDM will try to request a latest version(0) of storage id.
+ * If the storage id computation algorithm changed, we should increase the
+ * kCurrentVersion.
+ */
+
+#include <string>
+
+#include "nsString.h"
+
+namespace mozilla {
+
+class CDMStorageIdProvider {
+  static constexpr const char* kBrowserIdentifier = "mozilla_firefox_gecko";
+
+ public:
+  // Should increase the value when the storage id algorithm changed.
+  static constexpr int kCurrentVersion = 1;
+  static constexpr int kCDMRequestLatestVersion = 0;
+
+  // Return empty string when
+  // 1. Call on unsupported storageid platform.
+  // 2. Failed to compute the storage id.
+  // This function only provide the storage id for kCurrentVersion=1.
+  // If you want to change the algorithm or output of storageid,
+  // you should keep the version 1 storage id and consider to provide
+  // higher version storage id in another function.
+  static nsCString ComputeStorageId(const nsCString& aOriginSalt);
+};
+
+}  // namespace mozilla
+
+#endif  // CDMStorageIdProvider_h_