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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/public/common/loader/mime_sniffing_throttle.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "net/base/mime_sniffer.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/common/loader/mime_sniffing_url_loader.h"
namespace blink {
MimeSniffingThrottle::MimeSniffingThrottle(
scoped_refptr<base::SequencedTaskRunner> task_runner)
: task_runner_(std::move(task_runner)) {
DCHECK(task_runner_);
}
MimeSniffingThrottle::~MimeSniffingThrottle() = default;
void MimeSniffingThrottle::DetachFromCurrentSequence() {
// This should only happen when the throttle loader runs on its own sequenced
// task runner (so getting the current sequenced runner later should be
// fine).
task_runner_ = nullptr;
}
void MimeSniffingThrottle::WillProcessResponse(
const GURL& response_url,
network::mojom::URLResponseHead* response_head,
bool* defer) {
// No need to do mime sniffing again.
if (response_head->did_mime_sniff)
return;
bool blocked_sniffing_mime = false;
if (response_head->headers) {
if (std::optional<std::string> content_type_options =
response_head->headers->GetNormalizedHeader(
"x-content-type-options")) {
blocked_sniffing_mime =
base::EqualsCaseInsensitiveASCII(*content_type_options, "nosniff");
}
}
if (!blocked_sniffing_mime &&
net::ShouldSniffMimeType(response_url, response_head->mime_type)) {
// Pause the response until the mime type becomes ready.
*defer = true;
mojo::PendingRemote<network::mojom::URLLoader> new_remote;
mojo::PendingReceiver<network::mojom::URLLoaderClient> new_receiver;
mojo::PendingRemote<network::mojom::URLLoader> source_loader;
mojo::PendingReceiver<network::mojom::URLLoaderClient>
source_client_receiver;
mojo::ScopedDataPipeConsumerHandle body;
MimeSniffingURLLoader* mime_sniffing_loader;
std::tie(new_remote, new_receiver, mime_sniffing_loader) =
MimeSniffingURLLoader::CreateLoader(
weak_factory_.GetWeakPtr(), response_url, response_head->Clone(),
task_runner_ ? task_runner_
: base::SingleThreadTaskRunner::GetCurrentDefault());
delegate_->InterceptResponse(std::move(new_remote), std::move(new_receiver),
&source_loader, &source_client_receiver,
&body);
mime_sniffing_loader->Start(std::move(source_loader),
std::move(source_client_receiver),
std::move(body));
}
}
const char* MimeSniffingThrottle::NameForLoggingWillProcessResponse() {
return "MimeSniffingThrottle";
}
void MimeSniffingThrottle::ResumeWithNewResponseHead(
network::mojom::URLResponseHeadPtr new_response_head,
mojo::ScopedDataPipeConsumerHandle body) {
delegate_->UpdateDeferredResponseHead(std::move(new_response_head),
std::move(body));
delegate_->Resume();
}
} // namespace blink
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