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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_MEDIA_KEY_SESSION_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_MEDIA_KEY_SESSION_H_
#include <memory>
#include <optional>
#include "third_party/blink/public/platform/web_content_decryption_module_session.h"
#include "third_party/blink/public/platform/web_encrypted_media_types.h"
#include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_property.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_media_key_session_closed_reason.h"
#include "third_party/blink/renderer/core/execution_context/execution_context_lifecycle_observer.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_piece.h"
#include "third_party/blink/renderer/modules/encryptedmedia/encrypted_media_utils.h"
#include "third_party/blink/renderer/modules/encryptedmedia/media_key_status_map.h"
#include "third_party/blink/renderer/modules/event_target_modules.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_deque.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/prefinalizer.h"
#include "third_party/blink/renderer/platform/timer.h"
namespace media {
enum class EmeInitDataType;
enum class CdmSessionClosedReason;
}
namespace blink {
class DOMException;
class EventQueue;
class ExceptionState;
class MediaKeys;
// References are held by JS only. However, even if all JS references are
// dropped, it won't be garbage collected until close event received or
// MediaKeys goes away (as determined by a WeakMember reference). This allows
// the CDM to continue to fire events for this session, as long as the session
// is open.
//
// WeakMember<MediaKeys> is used instead of having MediaKeys and MediaKeySession
// keep references to each other, and then having to inform the other object
// when it gets destroyed. When the Oilpan garbage collector determines that
// only WeakMember<> references remain to the MediaKeys object, the MediaKeys
// object will be finalized and the WeakMember<> references will be cleared
// out(zeroed) by the garbage collector.
//
// Because this object controls the lifetime of the
// WebContentDecryptionModuleSession, it may outlive any JavaScript references
// as long as the MediaKeys object is alive.
// The WebContentDecryptionModuleSession has the same lifetime as this object.
class MediaKeySession final
: public EventTarget,
public ActiveScriptWrappable<MediaKeySession>,
public ExecutionContextLifecycleObserver,
private WebContentDecryptionModuleSession::Client {
DEFINE_WRAPPERTYPEINFO();
USING_PRE_FINALIZER(MediaKeySession, Dispose);
public:
MediaKeySession(ScriptState*,
MediaKeys*,
WebEncryptedMediaSessionType,
const MediaKeysConfig&);
~MediaKeySession() override;
String sessionId() const;
double expiration() const { return expiration_; }
ScriptPromise<V8MediaKeySessionClosedReason> closed(ScriptState*);
MediaKeyStatusMap* keyStatuses();
DEFINE_ATTRIBUTE_EVENT_LISTENER(keystatuseschange, kKeystatuseschange)
DEFINE_ATTRIBUTE_EVENT_LISTENER(message, kMessage)
ScriptPromise<IDLUndefined> generateRequest(ScriptState*,
const String& init_data_type,
const DOMArrayPiece& init_data,
ExceptionState&);
ScriptPromise<IDLBoolean> load(ScriptState*,
const String& session_id,
ExceptionState&);
ScriptPromise<IDLUndefined> update(ScriptState*,
const DOMArrayPiece& response,
ExceptionState&);
ScriptPromise<IDLUndefined> close(ScriptState*, ExceptionState&);
ScriptPromise<IDLUndefined> remove(ScriptState*, ExceptionState&);
// EventTarget
const AtomicString& InterfaceName() const override;
ExecutionContext* GetExecutionContext() const override;
// ScriptWrappable
bool HasPendingActivity() const final;
// ExecutionContextLifecycleObserver
void ContextDestroyed() override;
void Trace(Visitor*) const override;
private:
class PendingAction;
friend class NewSessionResultPromise;
friend class LoadSessionResultPromise;
friend class CloseSessionResultPromise;
void Dispose();
void ActionTimerFired(TimerBase*);
// The following perform the asynchronous part of the command referenced.
void GenerateRequestTask(ContentDecryptionModuleResult*,
media::EmeInitDataType,
DOMArrayBuffer* init_data_buffer);
void FinishGenerateRequest();
void LoadTask(ContentDecryptionModuleResult*, const String& session_id);
void FinishLoad();
void UpdateTask(ContentDecryptionModuleResult*,
DOMArrayBuffer* sanitized_response);
void CloseTask(ContentDecryptionModuleResult*);
void OnClosePromiseResolved();
void RemoveTask(ContentDecryptionModuleResult*);
// WebContentDecryptionModuleSession::Client
void OnSessionMessage(media::CdmMessageType message_type,
const unsigned char* message,
size_t message_length) override;
void OnSessionClosed(media::CdmSessionClosedReason reason) override;
void OnSessionExpirationUpdate(double updated_expiry_time_in_ms) override;
void OnSessionKeysChange(const std::vector<WebEncryptedMediaKeyInformation>&,
bool has_additional_usable_key) override;
Member<EventQueue> async_event_queue_;
std::unique_ptr<WebContentDecryptionModuleSession> session_;
// Used to determine if MediaKeys is still active.
WeakMember<MediaKeys> media_keys_;
const WebEncryptedMediaSessionType session_type_;
const MediaKeysConfig config_;
// Session properties.
String session_id_;
double expiration_;
Member<MediaKeyStatusMap> key_statuses_map_;
// Session states.
bool is_uninitialized_ = true;
bool is_callable_ = false;
bool is_closing_ = false;
bool is_closed_ = false;
// Keep track of the closed promise.
typedef ScriptPromiseProperty<V8MediaKeySessionClosedReason, DOMException>
ClosedPromise;
Member<ClosedPromise> closed_promise_;
HeapDeque<Member<PendingAction>> pending_actions_;
HeapTaskRunnerTimer<MediaKeySession> action_timer_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_ENCRYPTEDMEDIA_MEDIA_KEY_SESSION_H_
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