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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webencryptedmediaclient_impl.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "media/base/key_systems.h"
#include "net/base/mime_util.h"
#include "third_party/WebKit/public/platform/WebEncryptedMediaRequest.h"
#include "third_party/WebKit/public/platform/WebMediaKeySystemConfiguration.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/platform/WebVector.h"
#include "webcontentdecryptionmoduleaccess_impl.h"
namespace media {
static bool IsSupportedContentType(
const std::string& key_system,
const std::string& mime_type,
const std::string& codecs) {
// Per RFC 6838, "Both top-level type and subtype names are case-insensitive."
// TODO(sandersd): Check that |container| matches the capability:
// - audioCapabilitys: audio/mp4 or audio/webm.
// - videoCapabilitys: video/mp4 or video/webm.
// http://crbug.com/429781.
std::string container = base::StringToLowerASCII(mime_type);
// TODO(sandersd): Strict checking for codecs. http://crbug.com/374751.
bool strip_codec_suffixes = !net::IsStrictMediaMimeType(container);
std::vector<std::string> codec_vector;
net::ParseCodecString(codecs, &codec_vector, strip_codec_suffixes);
return IsSupportedKeySystemWithMediaMimeType(container, codec_vector,
key_system);
}
static bool GetSupportedConfiguration(
const std::string& key_system,
const blink::WebMediaKeySystemConfiguration& candidate,
const blink::WebSecurityOrigin& security_origin,
blink::WebMediaKeySystemConfiguration* accumulated_configuration) {
if (!candidate.initDataTypes.isEmpty()) {
std::vector<blink::WebString> init_data_types;
for (size_t i = 0; i < candidate.initDataTypes.size(); i++) {
const blink::WebString& init_data_type = candidate.initDataTypes[i];
if (init_data_type.isEmpty())
return false;
if (base::IsStringASCII(init_data_type) &&
IsSupportedKeySystemWithInitDataType(
key_system, base::UTF16ToASCII(init_data_type))) {
init_data_types.push_back(init_data_type);
}
}
if (init_data_types.empty())
return false;
accumulated_configuration->initDataTypes = init_data_types;
}
// TODO(sandersd): Implement distinctiveIdentifier and persistentState checks.
if (candidate.distinctiveIdentifier !=
blink::WebMediaKeySystemConfiguration::Requirement::Optional ||
candidate.persistentState !=
blink::WebMediaKeySystemConfiguration::Requirement::Optional) {
return false;
}
if (!candidate.audioCapabilities.isEmpty()) {
std::vector<blink::WebMediaKeySystemMediaCapability> audio_capabilities;
for (size_t i = 0; i < candidate.audioCapabilities.size(); i++) {
const blink::WebMediaKeySystemMediaCapability& capabilities =
candidate.audioCapabilities[i];
if (capabilities.mimeType.isEmpty())
return false;
if (!base::IsStringASCII(capabilities.mimeType) ||
!base::IsStringASCII(capabilities.codecs) ||
!IsSupportedContentType(
key_system, base::UTF16ToASCII(capabilities.mimeType),
base::UTF16ToASCII(capabilities.codecs))) {
continue;
}
// TODO(sandersd): Support robustness.
if (!capabilities.robustness.isEmpty())
continue;
audio_capabilities.push_back(capabilities);
}
if (audio_capabilities.empty())
return false;
accumulated_configuration->audioCapabilities = audio_capabilities;
}
if (!candidate.videoCapabilities.isEmpty()) {
std::vector<blink::WebMediaKeySystemMediaCapability> video_capabilities;
for (size_t i = 0; i < candidate.videoCapabilities.size(); i++) {
const blink::WebMediaKeySystemMediaCapability& capabilities =
candidate.videoCapabilities[i];
if (capabilities.mimeType.isEmpty())
return false;
if (!base::IsStringASCII(capabilities.mimeType) ||
!base::IsStringASCII(capabilities.codecs) ||
!IsSupportedContentType(
key_system, base::UTF16ToASCII(capabilities.mimeType),
base::UTF16ToASCII(capabilities.codecs))) {
continue;
}
// TODO(sandersd): Support robustness.
if (!capabilities.robustness.isEmpty())
continue;
video_capabilities.push_back(capabilities);
}
if (video_capabilities.empty())
return false;
accumulated_configuration->videoCapabilities = video_capabilities;
}
// TODO(sandersd): Prompt for distinctive identifiers and/or persistent state
// if required. Make sure that future checks are silent.
// http://crbug.com/446263.
return true;
}
WebEncryptedMediaClientImpl::WebEncryptedMediaClientImpl(
scoped_ptr<CdmFactory> cdm_factory)
: cdm_factory_(cdm_factory.Pass()) {
}
WebEncryptedMediaClientImpl::~WebEncryptedMediaClientImpl() {
}
void WebEncryptedMediaClientImpl::requestMediaKeySystemAccess(
blink::WebEncryptedMediaRequest request) {
// TODO(jrummell): This should be asynchronous.
// Continued from requestMediaKeySystemAccess(), step 7, from
// https://w3c.github.io/encrypted-media/#requestmediakeysystemaccess
//
// 7.1 If keySystem is not one of the Key Systems supported by the user
// agent, reject promise with with a new DOMException whose name is
// NotSupportedError. String comparison is case-sensitive.
if (!base::IsStringASCII(request.keySystem())) {
request.requestNotSupported("Only ASCII keySystems are supported");
return;
}
std::string key_system = base::UTF16ToASCII(request.keySystem());
if (!IsConcreteSupportedKeySystem(key_system)) {
request.requestNotSupported("Unsupported keySystem");
return;
}
// 7.2 Let implementation be the implementation of keySystem.
// 7.3 For each value in supportedConfigurations, run the GetSupported
// Configuration algorithm and if successful, resolve promise with access
// and abort these steps.
const blink::WebVector<blink::WebMediaKeySystemConfiguration>&
configurations = request.supportedConfigurations();
// TODO(sandersd): Remove once Blink requires the configurations parameter for
// requestMediaKeySystemAccess().
if (configurations.isEmpty()) {
request.requestSucceeded(WebContentDecryptionModuleAccessImpl::Create(
request.keySystem(), blink::WebMediaKeySystemConfiguration(),
request.securityOrigin(), cdm_factory_.get()));
return;
}
for (size_t i = 0; i < configurations.size(); i++) {
const blink::WebMediaKeySystemConfiguration& candidate = configurations[i];
blink::WebMediaKeySystemConfiguration accumulated_configuration;
if (GetSupportedConfiguration(key_system, candidate,
request.securityOrigin(),
&accumulated_configuration)) {
request.requestSucceeded(WebContentDecryptionModuleAccessImpl::Create(
request.keySystem(), accumulated_configuration,
request.securityOrigin(), cdm_factory_.get()));
return;
}
}
// 7.4 Reject promise with a new DOMException whose name is NotSupportedError.
request.requestNotSupported(
"None of the requested configurations were supported.");
}
} // namespace media
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