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/*
* Copyright (C) 2016 Metrological Group B.V.
* Copyright (C) 2016 Igalia S.L.
*
* 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* HOLDER OR 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 "NavigatorEME.h"
#if ENABLE(ENCRYPTED_MEDIA)
#include "CDM.h"
#include "CDMLogging.h"
#include "Document.h"
#include "JSDOMPromiseDeferred.h"
#include "JSMediaKeySystemAccess.h"
#include "Logging.h"
#include "MediaKeySystemRequest.h"
#include <wtf/text/StringBuilder.h>
namespace WTF {
template<typename>
struct LogArgument;
template<typename T>
struct LogArgument<Vector<T>> {
static String toString(const Vector<T>& value)
{
StringBuilder builder;
builder.append('[');
for (auto item : value)
builder.append(LogArgument<T>::toString(item));
builder.append(']');
return builder.toString();
}
};
template<typename T>
struct LogArgument<std::optional<T>> {
static String toString(const std::optional<T>& value)
{
return value ? "nullopt"_s : LogArgument<T>::toString(value.value());
}
};
}
namespace WebCore {
#if !LOG_DISABLED || !RELEASE_LOG_DISABLED
template<typename... Arguments>
inline void infoLog(Logger& logger, const Arguments&... arguments)
{
logger.info(LogEME, arguments...);
}
#else
template<typename... Arguments>
inline void infoLog(Logger&, const Arguments&...)
{
}
#endif
static void tryNextSupportedConfiguration(Document&, RefPtr<CDM>&&, Vector<MediaKeySystemConfiguration>&&, RefPtr<DeferredPromise>&&, Ref<Logger>&&, Logger::LogSiteIdentifier&&);
void NavigatorEME::requestMediaKeySystemAccess(Navigator& navigator, Document& document, const String& keySystem, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, Ref<DeferredPromise>&& promise)
{
// https://w3c.github.io/encrypted-media/#dom-navigator-requestmediakeysystemaccess
// W3C Editor's Draft 09 November 2016
auto identifier = Logger::LogSiteIdentifier("NavigatorEME"_s, __func__, reinterpret_cast<uint64_t>(&navigator));
Ref<Logger> logger = document.logger();
infoLog(logger, identifier, "keySystem(", keySystem, "), supportedConfigurations(", supportedConfigurations, ")");
// When this method is invoked, the user agent must run the following steps:
// 1. If keySystem is the empty string, return a promise rejected with a newly created TypeError.
// 2. If supportedConfigurations is empty, return a promise rejected with a newly created TypeError.
if (keySystem.isEmpty() || supportedConfigurations.isEmpty()) {
infoLog(logger, identifier, "Rejected: empty keySystem(", keySystem.isEmpty(), ") or empty supportedConfigurations(", supportedConfigurations.isEmpty(), ")");
promise->reject(ExceptionCode::TypeError);
return;
}
auto request = MediaKeySystemRequest::create(document, keySystem, WTFMove(promise));
request->setAllowCallback([keySystem, supportedConfigurations = WTFMove(supportedConfigurations), weakDocument = WeakPtr { document }, logger = WTFMove(logger), identifier = WTFMove(identifier)](String&& mediaKeysHashSalt, Ref<DeferredPromise>&& promise) mutable {
RefPtr document = weakDocument.get();
if (!document) {
promise->reject(ExceptionCode::InvalidStateError);
return;
}
document->postTask([promise = WTFMove(promise), keySystem, logger = WTFMove(logger), identifier = WTFMove(identifier), supportedConfigurations = WTFMove(supportedConfigurations), mediaKeysHashSalt = WTFMove(mediaKeysHashSalt)] (ScriptExecutionContext& context) mutable {
// 3. Let document be the calling context's Document.
// 4. Let origin be the origin of document.
// 5. Let promise be a new promise.
// 6. Run the following steps in parallel:
// 6.1. If keySystem is not one of the Key Systems supported by the user agent, reject promise with a NotSupportedError.
// String comparison is case-sensitive.
if (!CDM::supportsKeySystem(keySystem)) {
infoLog(logger, identifier, "Rejected: keySystem(", keySystem, ") not supported");
promise->reject(ExceptionCode::NotSupportedError);
return;
}
// 6.2. Let implementation be the implementation of keySystem.
auto& document = downcast<Document>(context);
auto implementation = CDM::create(document, keySystem, mediaKeysHashSalt);
tryNextSupportedConfiguration(document, WTFMove(implementation), WTFMove(supportedConfigurations), WTFMove(promise), WTFMove(logger), WTFMove(identifier));
});
});
request->start();
}
static void tryNextSupportedConfiguration(Document& document, RefPtr<CDM>&& implementation, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, RefPtr<DeferredPromise>&& promise, Ref<Logger>&& logger, Logger::LogSiteIdentifier&& identifier)
{
// 6.3. For each value in supportedConfigurations:
if (!supportedConfigurations.isEmpty()) {
// 6.3.1. Let candidate configuration be the value.
// 6.3.2. Let supported configuration be the result of executing the Get Supported Configuration
// algorithm on implementation, candidate configuration, and origin.
MediaKeySystemConfiguration candidateConfiguration = WTFMove(supportedConfigurations.first());
supportedConfigurations.remove(0);
CDM::SupportedConfigurationCallback callback = [weakDocument = WeakPtr { document }, implementation = implementation, supportedConfigurations = WTFMove(supportedConfigurations), promise, logger = WTFMove(logger), identifier = WTFMove(identifier)] (std::optional<MediaKeySystemConfiguration> supportedConfiguration) mutable {
RefPtr document = weakDocument.get();
if (!document) {
infoLog(logger, identifier, "Rejected: document no longer exists");
if (promise)
promise->reject(ExceptionCode::InvalidStateError);
return;
}
// 6.3.3. If supported configuration is not NotSupported, run the following steps:
if (supportedConfiguration) {
// 6.3.3.1. Let access be a new MediaKeySystemAccess object, and initialize it as follows:
// 6.3.3.1.1. Set the keySystem attribute to keySystem.
// 6.3.3.1.2. Let the configuration value be supported configuration.
// 6.3.3.1.3. Let the cdm implementation value be implementation.
// Obtain reference to the key system string before the `implementation` RefPtr<> is cleared out.
const String& keySystem = implementation->keySystem();
auto access = MediaKeySystemAccess::create(*document, keySystem, WTFMove(supportedConfiguration.value()), implementation.releaseNonNull());
// 6.3.3.2. Resolve promise with access and abort the parallel steps of this algorithm.
infoLog(logger, identifier, "Resolved: keySystem(", keySystem, "), supportedConfiguration(", supportedConfiguration, ")");
promise->resolveWithNewlyCreated<IDLInterface<MediaKeySystemAccess>>(WTFMove(access));
return;
}
tryNextSupportedConfiguration(*document, WTFMove(implementation), WTFMove(supportedConfigurations), WTFMove(promise), WTFMove(logger), WTFMove(identifier));
};
implementation->getSupportedConfiguration(WTFMove(candidateConfiguration), WTFMove(callback));
return;
}
// 6.4. Reject promise with a NotSupportedError.
infoLog(logger, identifier, "Rejected: empty supportedConfigurations");
promise->reject(ExceptionCode::NotSupportedError);
}
} // namespace WebCore
#endif // ENABLE(ENCRYPTED_MEDIA)
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