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// Copyright 2013 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.
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "media/base/decryptor.h"
#include "media/base/media_export.h"
#include "media/base/media_keys.h"
class GURL;
namespace media {
class CdmFactory;
// ProxyDecryptor is for EME v0.1b only. It should not be used for the WD API.
// A decryptor proxy that creates a real decryptor object on demand and
// forwards decryptor calls to it.
// TODO(xhwang): Currently we don't support run-time switching among decryptor
// objects. Fix this when needed.
// TODO(xhwang): The ProxyDecryptor is not a Decryptor. Find a better name!
class MEDIA_EXPORT ProxyDecryptor {
// These are similar to the callbacks in media_keys.h, but pass back the
// web session ID rather than the internal session ID.
typedef base::Callback<void(const std::string& session_id)> KeyAddedCB;
typedef base::Callback<void(const std::string& session_id,
MediaKeys::KeyError error_code,
uint32 system_code)> KeyErrorCB;
typedef base::Callback<void(const std::string& session_id,
const std::vector<uint8>& message,
const GURL& destination_url)> KeyMessageCB;
ProxyDecryptor(const KeyAddedCB& key_added_cb,
const KeyErrorCB& key_error_cb,
const KeyMessageCB& key_message_cb);
virtual ~ProxyDecryptor();
// Returns the CdmContext associated with this object.
CdmContext* GetCdmContext();
// Only call this once.
bool InitializeCDM(CdmFactory* cdm_factory,
const std::string& key_system,
const GURL& security_origin);
// May only be called after InitializeCDM() succeeds.
bool GenerateKeyRequest(const std::string& init_data_type,
const uint8* init_data,
int init_data_length);
void AddKey(const uint8* key, int key_length,
const uint8* init_data, int init_data_length,
const std::string& session_id);
void CancelKeyRequest(const std::string& session_id);
// Helper function to create MediaKeys to handle the given |key_system|.
scoped_ptr<MediaKeys> CreateMediaKeys(
CdmFactory* cdm_factory,
const std::string& key_system,
const GURL& security_origin);
// Callbacks for firing session events.
void OnSessionMessage(const std::string& web_session_id,
const std::vector<uint8>& message,
const GURL& default_url);
void OnSessionKeysChange(const std::string& web_session_id,
bool has_additional_usable_key);
void OnSessionExpirationUpdate(const std::string& web_session_id,
const base::Time& new_expiry_time);
void OnSessionReady(const std::string& web_session_id);
void OnSessionClosed(const std::string& web_session_id);
void OnSessionError(const std::string& web_session_id,
MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message);
enum SessionCreationType {
// Called when a session is actually created or loaded.
void SetSessionId(SessionCreationType session_type,
const std::string& web_session_id);
// The real MediaKeys that manages key operations for the ProxyDecryptor.
scoped_ptr<MediaKeys> media_keys_;
// Callbacks for firing key events.
KeyAddedCB key_added_cb_;
KeyErrorCB key_error_cb_;
KeyMessageCB key_message_cb_;
// Keep track of both persistent and non-persistent sessions.
base::hash_map<std::string, bool> active_sessions_;
bool is_clear_key_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<ProxyDecryptor> weak_ptr_factory_;
} // namespace media