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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIA_CDM_SESSION_ADAPTER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIA_CDM_SESSION_ADAPTER_H_
#include <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "media/base/cdm_config.h"
#include "media/base/cdm_factory.h"
#include "media/base/content_decryption_module.h"
#include "media/base/key_systems.h"
#include "third_party/blink/public/platform/web_content_decryption_module_session.h"
#include "third_party/blink/renderer/platform/media/web_content_decryption_module_impl.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace base {
class Time;
class TimeTicks;
} // namespace base
namespace media {
class CdmContextRef;
class CdmFactory;
struct CdmConfig;
} // namespace media
namespace blink {
class WebContentDecryptionModuleSessionImpl;
// Owns the CDM instance and makes calls from session objects to the CDM.
// Forwards the session ID-based callbacks of the media::ContentDecryptionModule
// interface to the appropriate session object. Callers should hold references
// to this class as long as they need the CDM instance.
class PLATFORM_EXPORT CdmSessionAdapter
: public base::RefCounted<CdmSessionAdapter> {
public:
explicit CdmSessionAdapter(media::KeySystems* key_systems);
CdmSessionAdapter(const CdmSessionAdapter&) = delete;
CdmSessionAdapter& operator=(const CdmSessionAdapter&) = delete;
// Creates the CDM for |cdm_config| using |cdm_factory| and returns the result
// via |result|.
void CreateCdm(media::CdmFactory* cdm_factory,
const media::CdmConfig& cdm_config,
WebCdmCreatedCB web_cdm_created_cb);
// Provides a server certificate to be used to encrypt messages to the
// license server.
void SetServerCertificate(const std::vector<uint8_t>& certificate,
std::unique_ptr<media::SimpleCdmPromise> promise);
// Gets the key status for a hypothetical key with |min_hdcp_version|
// requirement.
void GetStatusForPolicy(media::HdcpVersion min_hdcp_version,
std::unique_ptr<media::KeyStatusCdmPromise> promise);
// Creates a new session and adds it to the internal map. RemoveSession()
// must be called when destroying it, if RegisterSession() was called.
std::unique_ptr<WebContentDecryptionModuleSessionImpl> CreateSession(
WebEncryptedMediaSessionType session_type);
// Adds a session to the internal map. Called once the session is successfully
// initialized. Returns true if the session was registered, false if there is
// already an existing session with the same |session_id|.
bool RegisterSession(
const std::string& session_id,
base::WeakPtr<WebContentDecryptionModuleSessionImpl> session);
// Removes a session from the internal map.
void UnregisterSession(const std::string& session_id);
// Initializes a session with the |init_data_type|, |init_data| and
// |session_type| provided.
void InitializeNewSession(
media::EmeInitDataType init_data_type,
const std::vector<uint8_t>& init_data,
media::CdmSessionType session_type,
std::unique_ptr<media::NewSessionCdmPromise> promise);
// Loads the session specified by |session_id|.
void LoadSession(media::CdmSessionType session_type,
const std::string& session_id,
std::unique_ptr<media::NewSessionCdmPromise> promise);
// Updates the session specified by |session_id| with |response|.
void UpdateSession(const std::string& session_id,
const std::vector<uint8_t>& response,
std::unique_ptr<media::SimpleCdmPromise> promise);
// Closes the session specified by |session_id|.
void CloseSession(const std::string& session_id,
std::unique_ptr<media::SimpleCdmPromise> promise);
// Removes stored session data associated with the session specified by
// |session_id|.
void RemoveSession(const std::string& session_id,
std::unique_ptr<media::SimpleCdmPromise> promise);
// Returns a CdmContextRef which provides access to CdmContext and by holding
// the CdmContextRef, makes sure the CdmContext is kept alive.
std::unique_ptr<media::CdmContextRef> GetCdmContextRef();
// Returns the key system name.
const std::string& GetKeySystem() const;
// Returns a prefix to use for UMAs.
const std::string& GetKeySystemUMAPrefix() const;
// Returns the CdmConfig used in creation of CDM.
const media::CdmConfig& GetCdmConfig() const;
private:
friend class base::RefCounted<CdmSessionAdapter>;
// Session ID to WebContentDecryptionModuleSessionImpl mapping.
typedef std::unordered_map<
std::string,
base::WeakPtr<WebContentDecryptionModuleSessionImpl>>
SessionMap;
~CdmSessionAdapter();
// Callback for CreateCdm().
void OnCdmCreated(const media::CdmConfig& cdm_config,
base::TimeTicks start_time,
const scoped_refptr<media::ContentDecryptionModule>& cdm,
media::CreateCdmStatus status);
// Callbacks for firing session events.
void OnSessionMessage(const std::string& session_id,
media::CdmMessageType message_type,
const std::vector<uint8_t>& message);
void OnSessionKeysChange(const std::string& session_id,
bool has_additional_usable_key,
media::CdmKeysInfo keys_info);
void OnSessionExpirationUpdate(const std::string& session_id,
base::Time new_expiry_time);
void OnSessionClosed(const std::string& session_id,
media::CdmSessionClosedReason reason);
// Helper function of the callbacks.
WebContentDecryptionModuleSessionImpl* GetSession(
const std::string& session_id);
// Non-owned
raw_ptr<media::KeySystems> key_systems_;
scoped_refptr<media::ContentDecryptionModule> cdm_;
SessionMap sessions_;
std::string key_system_uma_prefix_;
// media::CdmConfig used in creation of cdm_.
media::CdmConfig cdm_config_;
// A unique ID to trace CdmSessionAdapter::CreateCdm() call and the matching
// OnCdmCreated() call.
uint32_t trace_id_;
WebCdmCreatedCB web_cdm_created_cb_;
// NOTE: Weak pointers must be invalidated before all other member variables.
base::WeakPtrFactory<CdmSessionAdapter> weak_ptr_factory_{this};
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIA_CDM_SESSION_ADAPTER_H_
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