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// Copyright 2014 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 "media/blink/cdm_session_adapter.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/stl_util.h"
#include "media/base/cdm_factory.h"
#include "media/base/cdm_key_information.h"
#include "media/base/cdm_promise.h"
#include "media/base/key_systems.h"
#include "media/base/media_keys.h"
#include "media/blink/webcontentdecryptionmodule_impl.h"
#include "media/blink/webcontentdecryptionmodulesession_impl.h"
#include "url/gurl.h"
namespace media {
const char kMediaEME[] = "Media.EME.";
const char kDot[] = ".";
CdmSessionAdapter::CdmSessionAdapter() : weak_ptr_factory_(this) {
}
CdmSessionAdapter::~CdmSessionAdapter() {}
void CdmSessionAdapter::CreateCdm(
CdmFactory* cdm_factory,
const std::string& key_system,
bool allow_distinctive_identifier,
bool allow_persistent_state,
const GURL& security_origin,
blink::WebContentDecryptionModuleResult result) {
// Note: WebContentDecryptionModuleImpl::Create() calls this method without
// holding a reference to the CdmSessionAdapter. Bind OnCdmCreated() with
// |this| instead of |weak_this| to prevent |this| from being desctructed.
base::WeakPtr<CdmSessionAdapter> weak_this = weak_ptr_factory_.GetWeakPtr();
cdm_factory->Create(
key_system, allow_distinctive_identifier, allow_persistent_state,
security_origin,
base::Bind(&CdmSessionAdapter::OnSessionMessage, weak_this),
base::Bind(&CdmSessionAdapter::OnSessionClosed, weak_this),
base::Bind(&CdmSessionAdapter::OnLegacySessionError, weak_this),
base::Bind(&CdmSessionAdapter::OnSessionKeysChange, weak_this),
base::Bind(&CdmSessionAdapter::OnSessionExpirationUpdate, weak_this),
base::Bind(&CdmSessionAdapter::OnCdmCreated, this, key_system, result));
}
void CdmSessionAdapter::SetServerCertificate(
const uint8* server_certificate,
int server_certificate_length,
scoped_ptr<SimpleCdmPromise> promise) {
cdm_->SetServerCertificate(server_certificate, server_certificate_length,
promise.Pass());
}
WebContentDecryptionModuleSessionImpl* CdmSessionAdapter::CreateSession() {
return new WebContentDecryptionModuleSessionImpl(this);
}
bool CdmSessionAdapter::RegisterSession(
const std::string& session_id,
base::WeakPtr<WebContentDecryptionModuleSessionImpl> session) {
// If this session ID is already registered, don't register it again.
if (ContainsKey(sessions_, session_id))
return false;
sessions_[session_id] = session;
return true;
}
void CdmSessionAdapter::UnregisterSession(const std::string& session_id) {
DCHECK(ContainsKey(sessions_, session_id));
sessions_.erase(session_id);
}
void CdmSessionAdapter::InitializeNewSession(
EmeInitDataType init_data_type,
const uint8* init_data,
int init_data_length,
MediaKeys::SessionType session_type,
scoped_ptr<NewSessionCdmPromise> promise) {
cdm_->CreateSessionAndGenerateRequest(session_type, init_data_type, init_data,
init_data_length, promise.Pass());
}
void CdmSessionAdapter::LoadSession(MediaKeys::SessionType session_type,
const std::string& session_id,
scoped_ptr<NewSessionCdmPromise> promise) {
cdm_->LoadSession(session_type, session_id, promise.Pass());
}
void CdmSessionAdapter::UpdateSession(const std::string& session_id,
const uint8* response,
int response_length,
scoped_ptr<SimpleCdmPromise> promise) {
cdm_->UpdateSession(session_id, response, response_length, promise.Pass());
}
void CdmSessionAdapter::CloseSession(const std::string& session_id,
scoped_ptr<SimpleCdmPromise> promise) {
cdm_->CloseSession(session_id, promise.Pass());
}
void CdmSessionAdapter::RemoveSession(const std::string& session_id,
scoped_ptr<SimpleCdmPromise> promise) {
cdm_->RemoveSession(session_id, promise.Pass());
}
CdmContext* CdmSessionAdapter::GetCdmContext() {
return cdm_->GetCdmContext();
}
const std::string& CdmSessionAdapter::GetKeySystem() const {
return key_system_;
}
const std::string& CdmSessionAdapter::GetKeySystemUMAPrefix() const {
return key_system_uma_prefix_;
}
void CdmSessionAdapter::OnCdmCreated(
const std::string& key_system,
blink::WebContentDecryptionModuleResult result,
scoped_ptr<MediaKeys> cdm) {
DVLOG(2) << __FUNCTION__;
if (!cdm) {
result.completeWithError(
blink::WebContentDecryptionModuleExceptionNotSupportedError, 0,
"Failed to create the CDM instance.");
return;
}
key_system_ = key_system;
key_system_uma_prefix_ =
kMediaEME + GetKeySystemNameForUMA(key_system) + kDot;
cdm_ = cdm.Pass();
result.completeWithContentDecryptionModule(
new WebContentDecryptionModuleImpl(this));
}
void CdmSessionAdapter::OnSessionMessage(
const std::string& session_id,
MediaKeys::MessageType message_type,
const std::vector<uint8>& message,
const GURL& /* legacy_destination_url */) {
WebContentDecryptionModuleSessionImpl* session = GetSession(session_id);
DLOG_IF(WARNING, !session) << __FUNCTION__ << " for unknown session "
<< session_id;
if (session)
session->OnSessionMessage(message_type, message);
}
void CdmSessionAdapter::OnSessionKeysChange(const std::string& session_id,
bool has_additional_usable_key,
CdmKeysInfo keys_info) {
// TODO(jrummell): Pass |keys_info| on.
WebContentDecryptionModuleSessionImpl* session = GetSession(session_id);
DLOG_IF(WARNING, !session) << __FUNCTION__ << " for unknown session "
<< session_id;
if (session)
session->OnSessionKeysChange(has_additional_usable_key, keys_info.Pass());
}
void CdmSessionAdapter::OnSessionExpirationUpdate(
const std::string& session_id,
const base::Time& new_expiry_time) {
WebContentDecryptionModuleSessionImpl* session = GetSession(session_id);
DLOG_IF(WARNING, !session) << __FUNCTION__ << " for unknown session "
<< session_id;
if (session)
session->OnSessionExpirationUpdate(new_expiry_time);
}
void CdmSessionAdapter::OnSessionClosed(const std::string& session_id) {
WebContentDecryptionModuleSessionImpl* session = GetSession(session_id);
DLOG_IF(WARNING, !session) << __FUNCTION__ << " for unknown session "
<< session_id;
if (session)
session->OnSessionClosed();
}
void CdmSessionAdapter::OnLegacySessionError(
const std::string& session_id,
MediaKeys::Exception exception_code,
uint32 system_code,
const std::string& error_message) {
// Error events not used by unprefixed EME.
// TODO(jrummell): Remove when prefixed EME removed.
}
WebContentDecryptionModuleSessionImpl* CdmSessionAdapter::GetSession(
const std::string& session_id) {
// Since session objects may get garbage collected, it is possible that there
// are events coming back from the CDM and the session has been unregistered.
// We can not tell if the CDM is firing events at sessions that never existed.
SessionMap::iterator session = sessions_.find(session_id);
return (session != sessions_.end()) ? session->second.get() : NULL;
}
} // namespace media
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