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// Copyright 2017 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/web_package/signed_exchange_request_handler.h"
#include <memory>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "content/browser/loader/response_head_update_params.h"
#include "content/browser/web_package/signed_exchange_devtools_proxy.h"
#include "content/browser/web_package/signed_exchange_loader.h"
#include "content/browser/web_package/signed_exchange_reporter.h"
#include "content/browser/web_package/signed_exchange_utils.h"
#include "content/public/common/content_features.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "net/http/http_response_headers.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/single_request_url_loader_factory.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/common/loader/throttling_url_loader.h"
#include "third_party/blink/public/common/origin_trials/trial_token_validator.h"
namespace content {
// static
bool SignedExchangeRequestHandler::IsSupportedMimeType(
const std::string& mime_type) {
return mime_type == "application/signed-exchange";
}
SignedExchangeRequestHandler::SignedExchangeRequestHandler(
uint32_t url_loader_options,
FrameTreeNodeId frame_tree_node_id,
const base::UnguessableToken& devtools_navigation_token,
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
URLLoaderThrottlesGetter url_loader_throttles_getter,
std::string accept_langs)
: url_loader_options_(url_loader_options),
frame_tree_node_id_(frame_tree_node_id),
devtools_navigation_token_(devtools_navigation_token),
url_loader_factory_(url_loader_factory),
url_loader_throttles_getter_(std::move(url_loader_throttles_getter)),
accept_langs_(std::move(accept_langs)) {}
SignedExchangeRequestHandler::~SignedExchangeRequestHandler() = default;
void SignedExchangeRequestHandler::MaybeCreateLoader(
const network::ResourceRequest& tentative_resource_request,
BrowserContext* browser_context,
LoaderCallback callback,
FallbackCallback fallback_callback) {
if (!signed_exchange_loader_) {
std::move(callback).Run(std::nullopt);
return;
}
if (signed_exchange_loader_->fallback_url()) {
DCHECK(tentative_resource_request.url.EqualsIgnoringRef(
*signed_exchange_loader_->fallback_url()));
signed_exchange_loader_ = nullptr;
// Skip subsequent interceptors and fallback to the network.
std::move(callback).Run(NavigationLoaderInterceptor::Result(
/*factory=*/nullptr, /*subresource_loader_params=*/{}));
return;
}
DCHECK(tentative_resource_request.url.EqualsIgnoringRef(
*signed_exchange_loader_->inner_request_url()));
std::move(callback).Run(NavigationLoaderInterceptor::Result(
base::MakeRefCounted<network::SingleRequestURLLoaderFactory>(
base::BindOnce(&SignedExchangeRequestHandler::StartResponse,
weak_factory_.GetWeakPtr())),
/*subresource_loader_params=*/{}));
}
bool SignedExchangeRequestHandler::MaybeCreateLoaderForResponse(
const network::URLLoaderCompletionStatus& status,
const network::ResourceRequest& request,
network::mojom::URLResponseHeadPtr* response_head,
mojo::ScopedDataPipeConsumerHandle* response_body,
mojo::PendingRemote<network::mojom::URLLoader>* loader,
mojo::PendingReceiver<network::mojom::URLLoaderClient>* client_receiver,
blink::ThrottlingURLLoader* url_loader,
bool* skip_other_interceptors) {
DCHECK(!signed_exchange_loader_);
// Navigation ResourceRequests always have non-empty trusted_params.
CHECK(request.trusted_params);
if (!signed_exchange_utils::ShouldHandleAsSignedHTTPExchange(
request.url, **response_head)) {
return false;
}
mojo::PendingRemote<network::mojom::URLLoaderClient> client;
*client_receiver = client.InitWithNewPipeAndPassReceiver();
const net::NetworkAnonymizationKey& network_anonymization_key =
request.trusted_params->isolation_info.network_anonymization_key();
// This lets the SignedExchangeLoader directly returns an artificial redirect
// to the downstream client without going through blink::ThrottlingURLLoader,
// which means some checks like SafeBrowsing may not see the redirect. Given
// that the redirected request will be checked when it's restarted we suppose
// this is fine.
auto reporter = SignedExchangeReporter::MaybeCreate(
request.url, request.referrer.spec(), **response_head,
network_anonymization_key, frame_tree_node_id_);
auto devtools_proxy = std::make_unique<SignedExchangeDevToolsProxy>(
request.url, response_head->Clone(), frame_tree_node_id_,
devtools_navigation_token_, request.devtools_request_id.has_value());
signed_exchange_loader_ = std::make_unique<SignedExchangeLoader>(
request, std::move(*response_head), std::move(*response_body),
std::move(client), url_loader->Unbind(), url_loader_options_,
true /* should_redirect_to_fallback */, std::move(devtools_proxy),
std::move(reporter), url_loader_factory_, url_loader_throttles_getter_,
frame_tree_node_id_, accept_langs_,
false /* keep_entry_for_prefetch_cache */);
*skip_other_interceptors = true;
return true;
}
void SignedExchangeRequestHandler::StartResponse(
const network::ResourceRequest& resource_request,
mojo::PendingReceiver<network::mojom::URLLoader> receiver,
mojo::PendingRemote<network::mojom::URLLoaderClient> client) {
signed_exchange_loader_->ConnectToClient(std::move(client));
mojo::MakeSelfOwnedReceiver(std::move(signed_exchange_loader_),
std::move(receiver));
}
} // namespace content
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