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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 "components/no_state_prefetch/common/no_state_prefetch_url_loader_throttle.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/task/sequenced_task_runner.h"
#include "build/build_config.h"
#include "components/no_state_prefetch/common/no_state_prefetch_utils.h"
#include "content/public/common/content_constants.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/load_flags.h"
#include "net/url_request/redirect_info.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/loader/resource_type_util.h"
#include "third_party/blink/public/common/navigation/preloading_headers.h"
namespace prerender {
namespace {
void CallCancelNoStatePrefetchForUnsupportedScheme(
mojo::PendingRemote<prerender::mojom::NoStatePrefetchCanceler> canceler) {
mojo::Remote<prerender::mojom::NoStatePrefetchCanceler>(std::move(canceler))
->CancelNoStatePrefetchForUnsupportedScheme();
}
} // namespace
NoStatePrefetchURLLoaderThrottle::NoStatePrefetchURLLoaderThrottle(
mojo::PendingRemote<prerender::mojom::NoStatePrefetchCanceler> canceler)
: canceler_(std::move(canceler)) {
DCHECK(canceler_);
}
NoStatePrefetchURLLoaderThrottle::~NoStatePrefetchURLLoaderThrottle() {
if (destruction_closure_) {
std::move(destruction_closure_).Run();
}
}
void NoStatePrefetchURLLoaderThrottle::DetachFromCurrentSequence() {
if (destruction_closure_) {
destruction_closure_ = base::BindOnce(
[](scoped_refptr<base::SequencedTaskRunner> task_runner,
base::OnceClosure destruction_closure) {
task_runner->PostTask(FROM_HERE, std::move(destruction_closure));
},
base::SequencedTaskRunner::GetCurrentDefault(),
std::move(destruction_closure_));
}
}
void NoStatePrefetchURLLoaderThrottle::WillStartRequest(
network::ResourceRequest* request,
bool* defer) {
request->load_flags |= net::LOAD_PREFETCH;
if (!base::FeatureList::IsEnabled(
blink::features::kRemovePurposeHeaderForPrefetch)) {
request->cors_exempt_headers.SetHeader(
blink::kPurposeHeaderName, blink::kSecPurposePrefetchHeaderValue);
}
request_destination_ = request->destination;
// Abort any prerenders that spawn requests that use unsupported HTTP
// methods or schemes.
if (!IsValidHttpMethod(request->method)) {
// If this is a full prerender, cancel the prerender in response to
// invalid requests. For prefetches, cancel invalid requests but keep the
// prefetch going.
delegate_->CancelWithError(net::ERR_ABORTED);
}
if (request->destination != network::mojom::RequestDestination::kDocument &&
!DoesSubresourceURLHaveValidScheme(request->url)) {
// Destroying the prerender for unsupported scheme only for non-main
// resource to allow chrome://crash to actually crash in the
// *RendererCrash tests instead of being intercepted here. The
// unsupported scheme for the main resource is checked in
// WillRedirectRequest() and NoStatePrefetchContents::CheckURL(). See
// http://crbug.com/673771.
delegate_->CancelWithError(net::ERR_ABORTED);
CallCancelNoStatePrefetchForUnsupportedScheme(std::move(canceler_));
return;
}
#if BUILDFLAG(IS_ANDROID)
if (request->is_favicon) {
// Delay icon fetching until the contents are getting swapped in
// to conserve network usage in mobile devices.
*defer = true;
return;
}
#else
// Priorities for prerendering requests are lowered, to avoid competing with
// other page loads, except on Android where this is less likely to be a
// problem. In some cases, this may negatively impact the performance of
// prerendering, see https://crbug.com/652746 for details.
// Requests with the IGNORE_LIMITS flag set (i.e., sync XHRs)
// should remain at MAXIMUM_PRIORITY.
if (request->load_flags & net::LOAD_IGNORE_LIMITS) {
DCHECK_EQ(request->priority, net::MAXIMUM_PRIORITY);
} else if (request->priority != net::IDLE) {
request->priority = net::IDLE;
}
#endif // BUILDFLAG(IS_ANDROID)
detached_timer_.Start(
FROM_HERE, base::Milliseconds(content::kDefaultDetachableCancelDelayMs),
this, &NoStatePrefetchURLLoaderThrottle::OnTimedOut);
}
const char* NoStatePrefetchURLLoaderThrottle::NameForLoggingWillStartRequest() {
return "NoStatePrefetchThrottle";
}
void NoStatePrefetchURLLoaderThrottle::WillRedirectRequest(
net::RedirectInfo* redirect_info,
const network::mojom::URLResponseHead& response_head,
bool* defer,
std::vector<std::string>* /* to_be_removed_headers */,
net::HttpRequestHeaders* /* modified_headers */,
net::HttpRequestHeaders* /* modified_cors_exempt_headers */) {
std::string follow_only_when_prerender_shown_header;
if (response_head.headers) {
follow_only_when_prerender_shown_header =
response_head.headers
->GetNormalizedHeader(kFollowOnlyWhenPrerenderShown)
.value_or(std::string());
}
// Abort any prerenders with requests which redirect to invalid schemes.
if (!DoesURLHaveValidScheme(redirect_info->new_url)) {
delegate_->CancelWithError(net::ERR_ABORTED);
CallCancelNoStatePrefetchForUnsupportedScheme(std::move(canceler_));
} else if (follow_only_when_prerender_shown_header == "1" &&
request_destination_ !=
network::mojom::RequestDestination::kDocument) {
// Only defer redirects with the Follow-Only-When-Prerender-Shown
// header. Do not defer redirects on main frame loads.
*defer = true;
deferred_ = true;
}
}
void NoStatePrefetchURLLoaderThrottle::OnTimedOut() {
delegate_->CancelWithError(net::ERR_ABORTED);
}
} // namespace prerender
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