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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 "modules/encryptedmedia/MediaKeys.h"
#include "bindings/v8/ExceptionState.h"
#include "core/events/ThreadLocalEventNames.h"
#include "core/html/HTMLMediaElement.h"
#include "modules/encryptedmedia/MediaKeyMessageEvent.h"
#include "modules/encryptedmedia/MediaKeySession.h"
#include "platform/UUID.h"
#include "platform/drm/ContentDecryptionModule.h"
#include "wtf/HashSet.h"
namespace WebCore {
PassRefPtr<MediaKeys> MediaKeys::create(const String& keySystem, ExceptionState& exceptionState)
{
// From <http://dvcs.w3.org/hg/html-media/raw-file/default/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 InvalidAccessError exception and abort these steps.
if (keySystem.isEmpty()) {
exceptionState.throwUninformativeAndGenericDOMException(InvalidAccessError);
return 0;
}
// 2. If keySystem is not one of the user agent's supported Key Systems, throw a NotSupportedError and abort these steps.
if (!ContentDecryptionModule::supportsKeySystem(keySystem)) {
exceptionState.throwUninformativeAndGenericDOMException(NotSupportedError);
return 0;
}
// 3. Let cdm be the content decryption module corresponding to keySystem.
// 4. Load cdm if necessary.
OwnPtr<ContentDecryptionModule> cdm = ContentDecryptionModule::create(keySystem);
if (!cdm) {
exceptionState.throwUninformativeAndGenericDOMException(NotSupportedError);
return 0;
}
// 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, cdm.release()));
}
MediaKeys::MediaKeys(const String& keySystem, PassOwnPtr<ContentDecryptionModule> cdm)
: m_mediaElement(0)
, m_keySystem(keySystem)
, m_cdm(cdm)
{
ScriptWrappable::init(this);
}
MediaKeys::~MediaKeys()
{
// From <http://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#dom-media-keys-constructor>:
// When destroying a MediaKeys object, follow the steps in close().
for (size_t i = 0; i < m_sessions.size(); ++i)
m_sessions[i]->close();
}
PassRefPtr<MediaKeySession> MediaKeys::createSession(ExecutionContext* context, const String& type, Uint8Array* initData, ExceptionState& exceptionState)
{
// From <http://dvcs.w3.org/hg/html-media/raw-file/default/encrypted-media/encrypted-media.html#dom-createsession>:
// The createSession(type, initData) method must run the following steps:
// Note: The contents of initData are container-specific Initialization Data.
// 1. If type is null or an empty string and initData is not null or an empty string, throw an
// InvalidAccessError exception and abort these steps.
if ((type.isEmpty()) && (!initData || initData->length())) {
exceptionState.throwUninformativeAndGenericDOMException(InvalidAccessError);
return 0;
}
// 2. If type contains a MIME type that is not supported or is not supported by the keySystem, throw
// a NotSupportedError exception and abort these steps.
ASSERT(!type.isEmpty());
if (type.isEmpty() || !m_cdm->supportsMIMEType(type)) {
exceptionState.throwUninformativeAndGenericDOMException(NotSupportedError);
return 0;
}
// 3. Create a new MediaKeySession object.
RefPtr<MediaKeySession> session = MediaKeySession::create(context, m_cdm.get(), this);
// 3.1 Let the keySystem attribute be keySystem.
ASSERT(!session->keySystem().isEmpty());
// 3.2 Let the sessionId attribute be a unique Session ID string. It may be generated by cdm.
// This is handled by m_cdm and may happen asynchronously.
// 4. Add the new object to an internal list of session objects.
m_sessions.append(session);
// 5. Schedule a task to generate a key request, providing type, initData, and the new object.
session->generateKeyRequest(type, initData);
// 6. Return the new object to the caller.
return session;
}
void MediaKeys::setMediaElement(HTMLMediaElement* element)
{
// FIXME: Cause HTMLMediaElement::setMediaKeys() to throw an exception if m_mediaElement is not 0.
// FIXME: Hook up the CDM to the WebMediaPlayer in Chromium.
ASSERT(!m_mediaElement);
m_mediaElement = element;
}
}
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