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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.
#ifndef CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
#define CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
#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_keys.h"
#if defined(ENABLE_PEPPER_CDMS)
#include "content/renderer/media/crypto/pepper_cdm_wrapper.h"
#endif
class GURL;
namespace content {
#if defined(ENABLE_BROWSER_CDMS)
class RendererCdmManager;
#endif // defined(ENABLE_BROWSER_CDMS)
// 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 ProxyDecryptor {
public:
// 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,
media::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(
#if defined(ENABLE_PEPPER_CDMS)
const CreatePepperCdmCB& create_pepper_cdm_cb,
#elif defined(ENABLE_BROWSER_CDMS)
RendererCdmManager* manager,
#endif // defined(ENABLE_PEPPER_CDMS)
const KeyAddedCB& key_added_cb,
const KeyErrorCB& key_error_cb,
const KeyMessageCB& key_message_cb);
virtual ~ProxyDecryptor();
// Returns the Decryptor associated with this object. May be NULL if no
// Decryptor is associated.
media::Decryptor* GetDecryptor();
#if defined(ENABLE_BROWSER_CDMS)
// Returns the CDM ID associated with this object. May be kInvalidCdmId if no
// CDM ID is associated, such as when Clear Key is used.
int GetCdmId();
#endif
// Only call this once.
bool InitializeCDM(const std::string& key_system,
const GURL& security_origin);
// May only be called after InitializeCDM() succeeds.
bool GenerateKeyRequest(const std::string& 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);
private:
// Helper function to create MediaKeys to handle the given |key_system|.
scoped_ptr<media::MediaKeys> CreateMediaKeys(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,
media::MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message);
enum SessionCreationType {
TemporarySession,
PersistentSession,
LoadSession
};
// Called when a session is actually created or loaded.
void SetSessionId(SessionCreationType session_type,
const std::string& web_session_id);
#if defined(ENABLE_PEPPER_CDMS)
// Callback to create the Pepper plugin.
CreatePepperCdmCB create_pepper_cdm_cb_;
#elif defined(ENABLE_BROWSER_CDMS)
RendererCdmManager* manager_;
int cdm_id_;
#endif // defined(ENABLE_PEPPER_CDMS)
// The real MediaKeys that manages key operations for the ProxyDecryptor.
scoped_ptr<media::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_;
DISALLOW_COPY_AND_ASSIGN(ProxyDecryptor);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
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