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// Copyright 2013 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 "third_party/blink/renderer/platform/media/web_content_decryption_module_impl.h"
#include <utility>
#include "base/bind.h"
#include "base/check.h"
#include "base/notreached.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "media/base/cdm_context.h"
#include "media/base/cdm_promise.h"
#include "media/base/content_decryption_module.h"
#include "media/base/key_systems.h"
#include "third_party/blink/public/platform/url_conversion.h"
#include "third_party/blink/public/platform/web_security_origin.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/renderer/platform/media/cdm_result_promise.h"
#include "third_party/blink/renderer/platform/media/cdm_session_adapter.h"
#include "third_party/blink/renderer/platform/media/web_content_decryption_module_session_impl.h"
#include "url/origin.h"
namespace blink {
namespace {
const char kCreateSessionSessionTypeUMAName[] = "CreateSession.SessionType";
const char kSetServerCertificateUMAName[] = "SetServerCertificate";
const char kGetStatusForPolicyUMAName[] = "GetStatusForPolicy";
bool ConvertHdcpVersion(const WebString& hdcp_version_string,
media::HdcpVersion* hdcp_version) {
if (!hdcp_version_string.ContainsOnlyASCII())
return false;
std::string hdcp_version_ascii = hdcp_version_string.Ascii();
// The strings are specified in the explainer doc:
// https://github.com/WICG/hdcp-detection/blob/master/explainer.md
if (hdcp_version_ascii.empty())
*hdcp_version = media::HdcpVersion::kHdcpVersionNone;
else if (hdcp_version_ascii == "1.0")
*hdcp_version = media::HdcpVersion::kHdcpVersion1_0;
else if (hdcp_version_ascii == "1.1")
*hdcp_version = media::HdcpVersion::kHdcpVersion1_1;
else if (hdcp_version_ascii == "1.2")
*hdcp_version = media::HdcpVersion::kHdcpVersion1_2;
else if (hdcp_version_ascii == "1.3")
*hdcp_version = media::HdcpVersion::kHdcpVersion1_3;
else if (hdcp_version_ascii == "1.4")
*hdcp_version = media::HdcpVersion::kHdcpVersion1_4;
else if (hdcp_version_ascii == "2.0")
*hdcp_version = media::HdcpVersion::kHdcpVersion2_0;
else if (hdcp_version_ascii == "2.1")
*hdcp_version = media::HdcpVersion::kHdcpVersion2_1;
else if (hdcp_version_ascii == "2.2")
*hdcp_version = media::HdcpVersion::kHdcpVersion2_2;
else if (hdcp_version_ascii == "2.3")
*hdcp_version = media::HdcpVersion::kHdcpVersion2_3;
else
return false;
return true;
}
} // namespace
void WebContentDecryptionModuleImpl::Create(
media::CdmFactory* cdm_factory,
const std::u16string& key_system,
const WebSecurityOrigin& security_origin,
const media::CdmConfig& cdm_config,
WebCdmCreatedCB web_cdm_created_cb) {
DCHECK(!security_origin.IsNull());
DCHECK(!key_system.empty());
// TODO(ddorwin): Guard against this in supported types check and remove this.
// Chromium only supports ASCII key systems.
if (!base::IsStringASCII(key_system)) {
NOTREACHED();
std::move(web_cdm_created_cb).Run(nullptr, "Invalid keysystem.");
return;
}
// TODO(ddorwin): This should be a DCHECK.
std::string key_system_ascii = base::UTF16ToASCII(key_system);
if (!media::KeySystems::GetInstance()->IsSupportedKeySystem(
key_system_ascii)) {
std::string message =
"Keysystem '" + key_system_ascii + "' is not supported.";
std::move(web_cdm_created_cb).Run(nullptr, message);
return;
}
// If opaque security origin, don't try to create the CDM.
if (security_origin.IsOpaque() || security_origin.ToString() == "null") {
std::move(web_cdm_created_cb)
.Run(nullptr, "EME use is not allowed on unique origins.");
return;
}
// CdmSessionAdapter::CreateCdm() will keep a reference to |adapter|. Then
// if WebContentDecryptionModuleImpl is successfully created (returned in
// |web_cdm_created_cb|), it will keep a reference to |adapter|. Otherwise,
// |adapter| will be destructed.
scoped_refptr<CdmSessionAdapter> adapter(new CdmSessionAdapter());
adapter->CreateCdm(cdm_factory, key_system_ascii, cdm_config,
std::move(web_cdm_created_cb));
}
WebContentDecryptionModuleImpl::WebContentDecryptionModuleImpl(
scoped_refptr<CdmSessionAdapter> adapter)
: adapter_(adapter) {
}
WebContentDecryptionModuleImpl::~WebContentDecryptionModuleImpl() = default;
std::unique_ptr<WebContentDecryptionModuleSession>
WebContentDecryptionModuleImpl::CreateSession(
WebEncryptedMediaSessionType session_type) {
base::UmaHistogramEnumeration(
adapter_->GetKeySystemUMAPrefix() + kCreateSessionSessionTypeUMAName,
session_type);
return adapter_->CreateSession(session_type);
}
void WebContentDecryptionModuleImpl::SetServerCertificate(
const uint8_t* server_certificate,
size_t server_certificate_length,
WebContentDecryptionModuleResult result) {
DCHECK(server_certificate);
adapter_->SetServerCertificate(
std::vector<uint8_t>(server_certificate,
server_certificate + server_certificate_length),
std::make_unique<CdmResultPromise<>>(result,
adapter_->GetKeySystemUMAPrefix(),
kSetServerCertificateUMAName));
}
void WebContentDecryptionModuleImpl::GetStatusForPolicy(
const WebString& min_hdcp_version_string,
WebContentDecryptionModuleResult result) {
media::HdcpVersion min_hdcp_version;
if (!ConvertHdcpVersion(min_hdcp_version_string, &min_hdcp_version)) {
result.CompleteWithError(kWebContentDecryptionModuleExceptionTypeError, 0,
"Invalid HDCP version");
return;
}
adapter_->GetStatusForPolicy(
min_hdcp_version,
std::make_unique<CdmResultPromise<media::CdmKeyInformation::KeyStatus>>(
result, adapter_->GetKeySystemUMAPrefix(),
kGetStatusForPolicyUMAName));
}
std::unique_ptr<media::CdmContextRef>
WebContentDecryptionModuleImpl::GetCdmContextRef() {
return adapter_->GetCdmContextRef();
}
std::string WebContentDecryptionModuleImpl::GetKeySystem() const {
return adapter_->GetKeySystem();
}
media::CdmConfig WebContentDecryptionModuleImpl::GetCdmConfig() const {
return adapter_->GetCdmConfig();
}
} // namespace blink
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