media: Add MediaDrmStorage

media/base/android/media_drm_storage.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_H_
+#define MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_H_
+
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "media/base/media_export.h"
+#include "url/origin.h"
+
+namespace media {
+
+// Allows MediaDrmBridge to store and retrieve persistent data. This is needed
+// for features like per-origin provisioning and persistent license support.
+class MEDIA_EXPORT MediaDrmStorage {
+ public:
+  struct SessionData {
+    SessionData(std::vector<uint8_t> key_set_id, std::string mime_type);
+    ~SessionData();
+
+    std::vector<uint8_t> key_set_id;
+    std::string mime_type;
+  };
+
+  MediaDrmStorage();
+  virtual ~MediaDrmStorage();
+
+  // Callback to return whether the operation succeeded.
+  using ResultCB = base::OnceCallback<void(bool)>;
+
+  // Callback to return the result of LoadPersistentSession. |key_set_id| and
+  // |mime_type| must be non-empty if |success| is true, and vice versa.
+  using LoadPersistentSessionCB =
+      base::OnceCallback<void(std::unique_ptr<SessionData> session_data)>;
+
+  // Binds |this| to |origin|.
+  // TODO(xhwang): The host of the service should know about the last committed
+  // origin. We should solely use that origin, or check the |origin| against it.
+  // TODO(xhwang): We should NOT use the real origin for provisioning. Use a
+  // random origin ID instead.
+  virtual void Initialize(const url::Origin& origin) = 0;
+
+  // Called when MediaDrm is provisioned for the origin bound to |this|.
+  // The implementation should keep track of the storing time so that the
+  // information can be cleared based on selected time range (e.g. for clearing
+  // browsing data).
+  virtual void OnProvisioned(ResultCB result_cb) = 0;
+
+  // Saves the persistent session info for |session_id| in the storage.
+  // The implementation should keep track of the storing time so that the
+  // information can be cleared based on selected time range (e.g. for clearing
+  // browsing data).
+  virtual void SavePersistentSession(const std::string& session_id,
+                                     const SessionData& session_data,
+                                     ResultCB result_cb) = 0;
+
+  // Loads the persistent session info for |session_id| from the storage.
+  virtual void LoadPersistentSession(
+      const std::string& session_id,
+      LoadPersistentSessionCB load_persistent_session_cb) = 0;
+
+  // Removes the persistent session info for |session_id| from the storage.
+  virtual void RemovePersistentSession(const std::string& session_id,
+                                       ResultCB result_cb) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MediaDrmStorage);
+};
+
+using CreateStorageCB = base::Callback<std::unique_ptr<MediaDrmStorage>()>;
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_ANDROID_MEDIA_DRM_STORAGE_H_