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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/media/url_provision_fetcher.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_functions.h"
#include "content/public/browser/provision_fetcher_factory.h"
#include "media/base/media_switches.h"
#include "net/base/load_flags.h"
#include "net/http/http_util.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
namespace content {
// Implementation of URLProvisionFetcher.
URLProvisionFetcher::URLProvisionFetcher(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
: url_loader_factory_(std::move(url_loader_factory)) {
DCHECK(url_loader_factory_);
}
URLProvisionFetcher::~URLProvisionFetcher() {}
void URLProvisionFetcher::Retrieve(
const GURL& default_url,
const std::string& request_data,
media::ProvisionFetcher::ResponseCB response_cb) {
// For testing, don't actually do provisioning if the feature is enabled,
// just indicate that the request failed.
if (base::FeatureList::IsEnabled(media::kFailUrlProvisionFetcherForTesting)) {
std::move(response_cb).Run(false, std::string());
return;
}
response_cb_ = std::move(response_cb);
const std::string request_string =
default_url.spec() + "&signedRequest=" + request_data;
DVLOG(1) << __func__ << ": request:" << request_string;
DCHECK(!simple_url_loader_);
net::NetworkTrafficAnnotationTag traffic_annotation =
net::DefineNetworkTrafficAnnotation("url_prevision_fetcher", R"(
semantics {
sender: "Content Decryption Module"
description:
"For a Content Decryption Module (CDM) to obtain origin-specific "
"identifiers from an individualization or provisioning server. See "
"https://w3c.github.io/encrypted-media/#direct-individualization."
trigger:
"During protected content playback, if the CDM hasn’t been "
"provisioned yet, it may trigger a provision request which will be "
"sent to a provisioning server."
data:
"Opaque provision request generated by the CDM. It may contain "
"distinctive identifiers (see "
"https://w3c.github.io/encrypted-media/#distinctive-identifier) "
"and/or distinctive permanent identifiers (see "
"https://w3c.github.io/encrypted-media/#distinctive-permanent-"
"identifier), which must be encrypted. It does NOT contain origin "
"information, even in encrypted form."
destination: OTHER
}
policy {
cookies_allowed: NO
setting:
"On Android, users can disable this feature by disabling Protected "
"Media Identifier permissions."
policy_exception_justification: "Not implemented."
})");
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = GURL(request_string);
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
resource_request->method = "POST";
resource_request->headers.SetHeader("User-Agent", "Widevine CDM v1.0");
simple_url_loader_ = network::SimpleURLLoader::Create(
std::move(resource_request), traffic_annotation);
simple_url_loader_->AttachStringForUpload("", "application/json");
simple_url_loader_->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
url_loader_factory_.get(),
base::BindOnce(&URLProvisionFetcher::OnSimpleLoaderComplete,
base::Unretained(this)));
}
void URLProvisionFetcher::OnSimpleLoaderComplete(
std::unique_ptr<std::string> response_body) {
bool success = false;
int response_code = simple_url_loader_->NetError();
std::string response;
const auto& headers = simple_url_loader_->ResponseInfo()
? simple_url_loader_->ResponseInfo()->headers
: nullptr;
if (headers) {
// If there is a valid header, use the HTTP response code instead of the
// net::Error status.
response_code =
net::HttpUtil::MapStatusCodeForHistogram(headers->response_code());
}
if (response_body) {
success = true;
response = std::move(*response_body);
} else {
DVLOG(1) << "CDM provision: server returned error code " << response_code;
}
simple_url_loader_.reset();
base::UmaHistogramSparse("Media.EME.UrlProvisionFetcher.ResponseCode",
response_code);
std::move(response_cb_).Run(success, response);
}
// Implementation of content public method CreateProvisionFetcher().
std::unique_ptr<media::ProvisionFetcher> CreateProvisionFetcher(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory) {
DCHECK(url_loader_factory);
return std::make_unique<URLProvisionFetcher>(std::move(url_loader_factory));
}
} // namespace content
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