/* * 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 "WebKitMediaKeys.h" #if ENABLE(LEGACY_ENCRYPTED_MEDIA) #include "HTMLMediaElement.h" #include "WebKitMediaKeySession.h" namespace WebCore { ExceptionOr<Ref<WebKitMediaKeys>> WebKitMediaKeys::create(const String& keySystem) { // 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 InvalidAccessError exception and abort these steps. if (keySystem.isEmpty()) return Exception { InvalidAccessError }; // 2. If keySystem is not one of the user agent's supported Key Systems, throw a NotSupportedError and abort these steps. if (!LegacyCDM::supportsKeySystem(keySystem)) return Exception { NotSupportedError }; // 3. Let cdm be the content decryption module corresponding to keySystem. // 4. Load cdm if necessary. auto cdm = LegacyCDM::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 WebKitMediaKeys(keySystem, WTFMove(cdm))); } WebKitMediaKeys::WebKitMediaKeys(const String& keySystem, std::unique_ptr<LegacyCDM>&& cdm) : m_keySystem(keySystem) , m_cdm(WTFMove(cdm)) { m_cdm->setClient(this); } WebKitMediaKeys::~WebKitMediaKeys() { // 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->detachKeys(); } } ExceptionOr<Ref<WebKitMediaKeySession>> WebKitMediaKeys::createSession(ScriptExecutionContext& context, const String& type, Ref<Uint8Array>&& initData) { // 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 InvalidAccessError exception and abort these steps. if (type.isEmpty()) return Exception { InvalidAccessError }; // 2. If initData is an empty array, throw an InvalidAccessError exception and abort these steps. if (!initData->length()) return Exception { InvalidAccessError }; // 3. 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. if (!m_cdm->supportsMIMEType(type)) return Exception { NotSupportedError }; // 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. auto session = WebKitMediaKeySession::create(context, *this, m_keySystem); m_sessions.append(session.copyRef()); // 5. Schedule a task to initialize the session, providing contentType, initData, and the new object. session->generateKeyRequest(type, WTFMove(initData)); // 6. Return the new object to the caller. return WTFMove(session); } bool WebKitMediaKeys::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.isEmpty() || !LegacyCDM::supportsKeySystem(keySystem)) return false; // 2. If type is null or an empty string, return true and abort these steps. if (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 (!LegacyCDM::keySystemSupportsMimeType(keySystem, mimeType)) return false; // 4. Return true; return true; } void WebKitMediaKeys::setMediaElement(HTMLMediaElement* element) { if (m_mediaElement && m_mediaElement->player()) { m_mediaElement->player()->setCDMSession(nullptr); m_mediaElement->player()->setCDM(nullptr); } m_mediaElement = makeWeakPtr(element); if (m_mediaElement && m_mediaElement->player()) { m_mediaElement->player()->setCDM(m_cdm.get()); if (!m_sessions.isEmpty()) m_mediaElement->player()->setCDMSession(m_sessions.last()->session()); } } RefPtr<MediaPlayer> WebKitMediaKeys::cdmMediaPlayer(const LegacyCDM*) const { if (!m_mediaElement) return nullptr; return m_mediaElement->player(); } void WebKitMediaKeys::keyAdded() { if (m_mediaElement) m_mediaElement->keyAdded(); } RefPtr<ArrayBuffer> WebKitMediaKeys::cachedKeyForKeyId(const String& keyId) const { for (auto& session : m_sessions) { if (auto key = session->cachedKeyForKeyId(keyId)) return key; } return nullptr; } } #endif