| /* |
| * 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 "MediaKeySession.h" |
| |
| #if ENABLE(ENCRYPTED_MEDIA_V2) |
| |
| #include "CDM.h" |
| #include "CDMSession.h" |
| #include "Event.h" |
| #include "GenericEventQueue.h" |
| #include "MediaKeyError.h" |
| #include "MediaKeyMessageEvent.h" |
| #include "MediaKeys.h" |
| |
| namespace WebCore { |
| |
| PassRefPtr<MediaKeySession> MediaKeySession::create(ScriptExecutionContext* context, MediaKeys* keys, const String& keySystem) |
| { |
| auto session = adoptRef(new MediaKeySession(context, keys, keySystem)); |
| session->suspendIfNeeded(); |
| return session; |
| } |
| |
| MediaKeySession::MediaKeySession(ScriptExecutionContext* context, MediaKeys* keys, const String& keySystem) |
| : ActiveDOMObject(context) |
| , m_keys(keys) |
| , m_keySystem(keySystem) |
| , m_asyncEventQueue(*this) |
| , m_session(keys->cdm()->createSession()) |
| , m_keyRequestTimer(this, &MediaKeySession::keyRequestTimerFired) |
| , m_addKeyTimer(this, &MediaKeySession::addKeyTimerFired) |
| { |
| m_session->setClient(this); |
| } |
| |
| MediaKeySession::~MediaKeySession() |
| { |
| if (m_session) { |
| m_session->setClient(nullptr); |
| m_session = nullptr; |
| } |
| |
| m_asyncEventQueue.cancelAllEvents(); |
| } |
| |
| void MediaKeySession::setError(MediaKeyError* error) |
| { |
| m_error = error; |
| } |
| |
| void MediaKeySession::close() |
| { |
| if (m_session) |
| m_session->releaseKeys(); |
| } |
| |
| const String& MediaKeySession::sessionId() const |
| { |
| return m_session->sessionId(); |
| } |
| |
| void MediaKeySession::generateKeyRequest(const String& mimeType, Uint8Array* initData) |
| { |
| m_pendingKeyRequests.append(PendingKeyRequest(mimeType, initData)); |
| m_keyRequestTimer.startOneShot(0); |
| } |
| |
| void MediaKeySession::keyRequestTimerFired(Timer&) |
| { |
| ASSERT(m_pendingKeyRequests.size()); |
| if (!m_session) |
| return; |
| |
| while (!m_pendingKeyRequests.isEmpty()) { |
| PendingKeyRequest request = m_pendingKeyRequests.takeFirst(); |
| |
| // NOTE: Continued from step 5 in MediaKeys::createSession(). |
| // The user agent will asynchronously execute the following steps in the task: |
| |
| // 1. Let cdm be the cdm loaded in the MediaKeys constructor. |
| // 2. Let destinationURL be null. |
| String destinationURL; |
| MediaKeyError::Code errorCode = 0; |
| unsigned long systemCode = 0; |
| |
| // 3. Use cdm to generate a key request and follow the steps for the first matching condition from the following list: |
| |
| RefPtr<Uint8Array> keyRequest = m_session->generateKeyRequest(request.mimeType, request.initData.get(), destinationURL, errorCode, systemCode); |
| |
| // Otherwise [if a request is not successfully generated]: |
| if (!keyRequest) { |
| // 3.1. Create a new MediaKeyError object with the following attributes: |
| // code = the appropriate MediaKeyError code |
| // systemCode = a Key System-specific value, if provided, and 0 otherwise |
| // 3.2. Set the MediaKeySession object's error attribute to the error object created in the previous step. |
| // 3.3. queue a task to fire a simple event named keyerror at the MediaKeySession object. |
| sendError(errorCode, systemCode); |
| // 3.4. Abort the task. |
| continue; |
| } |
| |
| // 4. queue a task to fire a simple event named keymessage at the new object |
| // The event is of type MediaKeyMessageEvent and has: |
| // message = key request |
| // destinationURL = destinationURL |
| sendMessage(keyRequest.get(), destinationURL); |
| } |
| } |
| |
| void MediaKeySession::update(Uint8Array* key, ExceptionCode& ec) |
| { |
| // From <http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html#dom-addkey>: |
| // The addKey(key) method must run the following steps: |
| // 1. If the first or second argument [sic] is null or an empty array, throw an INVALID_ACCESS_ERR. |
| // NOTE: the reference to a "second argument" is a spec bug. |
| if (!key || !key->length()) { |
| ec = INVALID_ACCESS_ERR; |
| return; |
| } |
| |
| // 2. Schedule a task to handle the call, providing key. |
| m_pendingKeys.append(key); |
| m_addKeyTimer.startOneShot(0); |
| } |
| |
| void MediaKeySession::addKeyTimerFired(Timer&) |
| { |
| ASSERT(m_pendingKeys.size()); |
| if (!m_session) |
| return; |
| |
| while (!m_pendingKeys.isEmpty()) { |
| RefPtr<Uint8Array> pendingKey = m_pendingKeys.takeFirst(); |
| unsigned short errorCode = 0; |
| unsigned long systemCode = 0; |
| |
| // NOTE: Continued from step 2. of MediaKeySession::update() |
| // 2.1. Let cdm be the cdm loaded in the MediaKeys constructor. |
| // NOTE: This is m_session. |
| // 2.2. Let 'did store key' be false. |
| bool didStoreKey = false; |
| // 2.3. Let 'next message' be null. |
| RefPtr<Uint8Array> nextMessage; |
| // 2.4. Use cdm to handle key. |
| didStoreKey = m_session->update(pendingKey.get(), nextMessage, errorCode, systemCode); |
| // 2.5. If did store key is true and the media element is waiting for a key, queue a task to attempt to resume playback. |
| // TODO: Find and restart the media element |
| |
| // 2.6. If next message is not null, queue a task to fire a simple event named keymessage at the MediaKeySession object. |
| // The event is of type MediaKeyMessageEvent and has: |
| // message = next message |
| // destinationURL = null |
| if (nextMessage) |
| sendMessage(nextMessage.get(), emptyString()); |
| |
| // 2.7. If did store key is true, queue a task to fire a simple event named keyadded at the MediaKeySession object. |
| if (didStoreKey) { |
| RefPtr<Event> keyaddedEvent = Event::create(eventNames().webkitkeyaddedEvent, false, false); |
| keyaddedEvent->setTarget(this); |
| m_asyncEventQueue.enqueueEvent(keyaddedEvent.release()); |
| } |
| |
| // 2.8. If any of the preceding steps in the task failed |
| if (errorCode) { |
| // 2.8.1. Create a new MediaKeyError object with the following attributes: |
| // code = the appropriate MediaKeyError code |
| // systemCode = a Key System-specific value, if provided, and 0 otherwise |
| // 2.8.2. Set the MediaKeySession object's error attribute to the error object created in the previous step. |
| // 2.8.3. queue a task to fire a simple event named keyerror at the MediaKeySession object. |
| sendError(errorCode, systemCode); |
| // 2.8.4. Abort the task. |
| // NOTE: no-op |
| } |
| } |
| } |
| |
| void MediaKeySession::sendMessage(Uint8Array* message, String destinationURL) |
| { |
| MediaKeyMessageEventInit init; |
| init.bubbles = false; |
| init.cancelable = false; |
| init.message = message; |
| init.destinationURL = destinationURL; |
| RefPtr<MediaKeyMessageEvent> event = MediaKeyMessageEvent::create(eventNames().webkitkeymessageEvent, init); |
| event->setTarget(this); |
| m_asyncEventQueue.enqueueEvent(event.release()); |
| } |
| |
| void MediaKeySession::sendError(CDMSessionClient::MediaKeyErrorCode errorCode, unsigned long systemCode) |
| { |
| RefPtr<MediaKeyError> error = MediaKeyError::create(errorCode, systemCode).get(); |
| setError(error.get()); |
| |
| RefPtr<Event> keyerrorEvent = Event::create(eventNames().webkitkeyerrorEvent, false, false); |
| keyerrorEvent->setTarget(this); |
| m_asyncEventQueue.enqueueEvent(keyerrorEvent.release()); |
| } |
| |
| } |
| |
| #endif |