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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 "Document.h"
#include "JSDOMPromiseDeferred.h"
#include "JSMediaKeySystemAccess.h"
#include "Logging.h"
namespace WebCore {
static void tryNextSupportedConfiguration(RefPtr<CDM>&& implementation, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, RefPtr<DeferredPromise>&&);
void NavigatorEME::requestMediaKeySystemAccess(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
LOG(EME, "EME - request media key system access for %s", keySystem.utf8().data());
// 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()) {
promise->reject(TypeError);
return;
}
document.postTask([keySystem, supportedConfigurations = WTFMove(supportedConfigurations), promise = WTFMove(promise), &document] (ScriptExecutionContext&) 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)) {
LOG(EME, "EME - %s is not supported", keySystem.utf8().data());
promise->reject(NotSupportedError);
return;
}
// 6.2. Let implementation be the implementation of keySystem.
auto implementation = CDM::create(document, keySystem);
tryNextSupportedConfiguration(WTFMove(implementation), WTFMove(supportedConfigurations), WTFMove(promise));
});
}
static void tryNextSupportedConfiguration(RefPtr<CDM>&& implementation, Vector<MediaKeySystemConfiguration>&& supportedConfigurations, RefPtr<DeferredPromise>&& promise)
{
// 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 = [implementation = implementation, supportedConfigurations = WTFMove(supportedConfigurations), promise] (Optional<MediaKeySystemConfiguration> supportedConfiguration) mutable {
// 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(keySystem, WTFMove(supportedConfiguration.value()), implementation.releaseNonNull());
// 6.3.3.2. Resolve promise with access and abort the parallel steps of this algorithm.
promise->resolveWithNewlyCreated<IDLInterface<MediaKeySystemAccess>>(WTFMove(access));
return;
}
tryNextSupportedConfiguration(WTFMove(implementation), WTFMove(supportedConfigurations), WTFMove(promise));
};
implementation->getSupportedConfiguration(WTFMove(candidateConfiguration), WTFMove(callback));
return;
}
// 6.4. Reject promise with a NotSupportedError.
promise->reject(NotSupportedError);
}
} // namespace WebCore
#endif // ENABLE(ENCRYPTED_MEDIA)