/* * 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 { PassRefPtr<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 0; } // 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 0; } // 3. Let cdm be the content decryption module corresponding to keySystem. // 4. Load cdm if necessary. OwnPtr<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, cdm.release())); } MediaKeys::MediaKeys(const String& keySystem, PassOwnPtr<CDM> cdm) : m_mediaElement(0) , m_keySystem(keySystem) , m_cdm(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 (size_t i = 0; i < m_sessions.size(); ++i) { m_sessions[i]->close(); m_sessions[i]->setKeys(0); } } PassRefPtr<MediaKeySession> MediaKeys::createSession(ScriptExecutionContext* context, const String& type, Uint8Array* initData, ExceptionCode& ec) { // From <http://dvcs.w3.org/hg/html-media/raw-file/tip/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 // INVALID_ACCESS_ERR exception and abort these steps. if ((type.isNull() || type.isEmpty()) && (!initData || initData->length())) { ec = INVALID_ACCESS_ERR; return 0; } // 2. 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 0; } // 3. Create a new MediaKeySession object. // 3.1 Let the keySystem attribute be keySystem. // 3.2 Let the sessionId attribute be a unique Session ID string. It may be generated by cdm. RefPtr<MediaKeySession> session = MediaKeySession::create(context, this, keySystem()); // 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; } 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) { m_mediaElement = element; } MediaPlayer* MediaKeys::cdmMediaPlayer(const CDM*) const { if (m_mediaElement) return m_mediaElement->player(); return 0; } } #endif