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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.
*/
#include "config.h"
#include "MediaKeys.h"
#if ENABLE(ENCRYPTED_MEDIA_V2)
#include "CDM.h"
#include "EventNames.h"
#include "HTMLMediaElement.h"
#include "MediaKeyMessageEvent.h"
#include "MediaKeySession.h"
#include "UUID.h"
#include <wtf/HashSet.h>
namespace WebCore {
RefPtr<MediaKeys> MediaKeys::create(const String& keySystem, ExceptionCode& ec)
{
// From <http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html#dom-media-keys-constructor>:
// The MediaKeys(keySystem) constructor must run the following steps:
// 1. If keySystem is null or an empty string, throw an INVALID_ACCESS_ERR exception and abort these steps.
if (keySystem.isNull() || keySystem.isEmpty()) {
ec = INVALID_ACCESS_ERR;
return nullptr;
}
// 2. If keySystem is not one of the user agent's supported Key Systems, throw a NOT_SUPPORTED_ERR and abort these steps.
if (!CDM::supportsKeySystem(keySystem)) {
ec = NOT_SUPPORTED_ERR;
return nullptr;
}
// 3. Let cdm be the content decryption module corresponding to keySystem.
// 4. Load cdm if necessary.
std::unique_ptr<CDM> cdm = CDM::create(keySystem);
// 5. Create a new MediaKeys object.
// 5.1 Let the keySystem attribute be keySystem.
// 6. Return the new object to the caller.
return adoptRef(*new MediaKeys(keySystem, WTFMove(cdm)));
}
MediaKeys::MediaKeys(const String& keySystem, std::unique_ptr<CDM> cdm)
: m_mediaElement(nullptr)
, m_keySystem(keySystem)
, m_cdm(WTFMove(cdm))
{
m_cdm->setClient(this);
}
MediaKeys::~MediaKeys()
{
// From <http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html#dom-media-keys-constructor>:
// When destroying a MediaKeys object, follow the steps in close().
for (auto& session : m_sessions) {
session->close();
session->setKeys(nullptr);
}
}
RefPtr<MediaKeySession> MediaKeys::createSession(ScriptExecutionContext* context, const String& type, Uint8Array* initData, ExceptionCode& ec)
{
// From <http://www.w3.org/TR/2014/WD-encrypted-media-20140218/#dom-createsession>:
// The createSession(type, initData) method must run the following steps:
// Note: The contents of initData are container-specific Initialization Data.
// 1. If contentType is null or an empty string, throw an INVALID_ACCESS_ERR exception and abort these steps.
if (type.isEmpty()) {
ec = INVALID_ACCESS_ERR;
return nullptr;
}
// 2. If initData is null or an empty array, throw an INVALID_ACCESS_ERR exception and abort these steps.
if (!initData || !initData->length()) {
ec = INVALID_ACCESS_ERR;
return nullptr;
}
// 3. If type contains a MIME type that is not supported or is not supported by the keySystem, throw
// a NOT_SUPPORTED_ERR exception and abort these steps.
if (!type.isNull() && !type.isEmpty() && !m_cdm->supportsMIMEType(type)) {
ec = NOT_SUPPORTED_ERR;
return nullptr;
}
// 4. Create a new MediaKeySession object.
// 4.1 Let the keySystem attribute be keySystem.
// 4.2 Let the sessionId attribute be a unique Session ID string. It may be generated by cdm.
RefPtr<MediaKeySession> session = MediaKeySession::create(context, this, keySystem());
m_sessions.append(session);
// 5. Schedule a task to initialize the session, providing contentType, initData, and the new object.
session->generateKeyRequest(type, initData);
// 6. Return the new object to the caller.
return session;
}
bool MediaKeys::isTypeSupported(const String& keySystem, const String& mimeType)
{
// 1. If keySystem contains an unrecognized or unsupported Key System, return false and abort these steps.
// Key system string comparison is case-sensitive.
if (keySystem.isNull() || keySystem.isEmpty() || !CDM::supportsKeySystem(keySystem))
return false;
// 2. If type is null or an empty string, return true and abort these steps.
if (mimeType.isNull() || mimeType.isEmpty())
return true;
// 3. If the Key System specified by keySystem does not support decrypting the container and/or codec
// specified by type, return false and abort these steps.
if (!CDM::keySystemSupportsMimeType(keySystem, mimeType))
return false;
// 4. Return true;
return true;
}
void MediaKeys::setMediaElement(HTMLMediaElement* element)
{
if (m_mediaElement && m_mediaElement->player())
m_mediaElement->player()->setCDMSession(nullptr);
m_mediaElement = element;
if (m_mediaElement && m_mediaElement->player() && !m_sessions.isEmpty())
m_mediaElement->player()->setCDMSession(m_sessions.last()->session());
}
MediaPlayer* MediaKeys::cdmMediaPlayer(const CDM*) const
{
if (m_mediaElement)
return m_mediaElement->player();
return 0;
}
void MediaKeys::keyAdded()
{
if (m_mediaElement)
m_mediaElement->keyAdded();
}
RefPtr<ArrayBuffer> MediaKeys::cachedKeyForKeyId(const String& keyId) const
{
for (auto& session : m_sessions) {
if (RefPtr<ArrayBuffer> key = session->cachedKeyForKeyId(keyId))
return key;
}
return nullptr;
}
}
#endif
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