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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_url_loader.h"
#include <string_view>
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "net/base/mime_sniffer.h"
#include "services/network/public/cpp/record_ontransfersizeupdate_utils.h"
#include "services/network/public/mojom/early_hints.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/common/loader/mime_sniffing_throttle.h"
namespace blink {
// static
const char MimeSniffingURLLoader::kDefaultMimeType[] = "text/plain";
// static
std::tuple<mojo::PendingRemote<network::mojom::URLLoader>,
mojo::PendingReceiver<network::mojom::URLLoaderClient>,
MimeSniffingURLLoader*>
MimeSniffingURLLoader::CreateLoader(
base::WeakPtr<MimeSniffingThrottle> throttle,
const GURL& response_url,
network::mojom::URLResponseHeadPtr response_head,
scoped_refptr<base::SequencedTaskRunner> task_runner) {
mojo::PendingRemote<network::mojom::URLLoader> url_loader;
mojo::PendingRemote<network::mojom::URLLoaderClient> url_loader_client;
mojo::PendingReceiver<network::mojom::URLLoaderClient>
url_loader_client_receiver =
url_loader_client.InitWithNewPipeAndPassReceiver();
auto loader = base::WrapUnique(new MimeSniffingURLLoader(
std::move(throttle), response_url, std::move(response_head),
std::move(url_loader_client), std::move(task_runner)));
MimeSniffingURLLoader* loader_rawptr = loader.get();
mojo::MakeSelfOwnedReceiver(std::move(loader),
url_loader.InitWithNewPipeAndPassReceiver());
return std::make_tuple(std::move(url_loader),
std::move(url_loader_client_receiver), loader_rawptr);
}
MimeSniffingURLLoader::MimeSniffingURLLoader(
base::WeakPtr<MimeSniffingThrottle> throttle,
const GURL& response_url,
network::mojom::URLResponseHeadPtr response_head,
mojo::PendingRemote<network::mojom::URLLoaderClient>
destination_url_loader_client,
scoped_refptr<base::SequencedTaskRunner> task_runner)
: throttle_(throttle),
destination_url_loader_client_(std::move(destination_url_loader_client)),
response_url_(response_url),
response_head_(std::move(response_head)),
task_runner_(task_runner),
body_consumer_watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::MANUAL,
task_runner),
body_producer_watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::MANUAL,
std::move(task_runner)) {}
MimeSniffingURLLoader::~MimeSniffingURLLoader() = default;
void MimeSniffingURLLoader::Start(
mojo::PendingRemote<network::mojom::URLLoader> source_url_loader_remote,
mojo::PendingReceiver<network::mojom::URLLoaderClient>
source_url_client_receiver,
mojo::ScopedDataPipeConsumerHandle body) {
source_url_loader_.Bind(std::move(source_url_loader_remote));
source_url_client_receiver_.Bind(std::move(source_url_client_receiver),
task_runner_);
if (!body)
return;
state_ = State::kSniffing;
body_consumer_handle_ = std::move(body);
body_consumer_watcher_.Watch(
body_consumer_handle_.get(),
MOJO_HANDLE_SIGNAL_READABLE | MOJO_HANDLE_SIGNAL_PEER_CLOSED,
base::BindRepeating(&MimeSniffingURLLoader::OnBodyReadable,
base::Unretained(this)));
body_consumer_watcher_.ArmOrNotify();
}
void MimeSniffingURLLoader::OnReceiveEarlyHints(
network::mojom::EarlyHintsPtr early_hints) {
// OnReceiveEarlyHints() shouldn't be called. See the comment in
// OnReceiveResponse().
NOTREACHED();
}
void MimeSniffingURLLoader::OnReceiveResponse(
network::mojom::URLResponseHeadPtr response_head,
mojo::ScopedDataPipeConsumerHandle body,
std::optional<mojo_base::BigBuffer> cached_metadata) {
// OnReceiveResponse() shouldn't be called because MimeSniffingURLLoader is
// created by MimeSniffingThrottle::WillProcessResponse(), which is equivalent
// to OnReceiveResponse().
NOTREACHED();
}
void MimeSniffingURLLoader::OnReceiveRedirect(
const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr response_head) {
// OnReceiveRedirect() shouldn't be called because MimeSniffingURLLoader is
// created by MimeSniffingThrottle::WillProcessResponse(), which is equivalent
// to OnReceiveResponse().
NOTREACHED();
}
void MimeSniffingURLLoader::OnUploadProgress(
int64_t current_position,
int64_t total_size,
OnUploadProgressCallback ack_callback) {
destination_url_loader_client_->OnUploadProgress(current_position, total_size,
std::move(ack_callback));
}
void MimeSniffingURLLoader::OnTransferSizeUpdated(int32_t transfer_size_diff) {
network::RecordOnTransferSizeUpdatedUMA(
network::OnTransferSizeUpdatedFrom::kMimeSniffingURLLoader);
destination_url_loader_client_->OnTransferSizeUpdated(transfer_size_diff);
}
void MimeSniffingURLLoader::OnComplete(
const network::URLLoaderCompletionStatus& status) {
DCHECK(!complete_status_.has_value());
switch (state_) {
case State::kWaitForBody:
// An error occured before receiving any data.
DCHECK_NE(net::OK, status.error_code);
state_ = State::kCompleted;
response_head_->mime_type = kDefaultMimeType;
if (!throttle_) {
Abort();
return;
}
throttle_->ResumeWithNewResponseHead(
std::move(response_head_), mojo::ScopedDataPipeConsumerHandle());
destination_url_loader_client_->OnComplete(status);
return;
case State::kSniffing:
case State::kSending:
// Defer calling OnComplete() until mime sniffing has finished and all
// data is sent.
complete_status_ = status;
return;
case State::kCompleted:
destination_url_loader_client_->OnComplete(status);
return;
case State::kAborted:
NOTREACHED();
}
NOTREACHED();
}
void MimeSniffingURLLoader::FollowRedirect(
const std::vector<std::string>& removed_headers,
const net::HttpRequestHeaders& modified_headers,
const net::HttpRequestHeaders& modified_cors_exempt_headers,
const std::optional<GURL>& new_url) {
// MimeSniffingURLLoader starts handling the request after
// OnReceivedResponse(). A redirect response is not expected.
NOTREACHED();
}
void MimeSniffingURLLoader::SetPriority(net::RequestPriority priority,
int32_t intra_priority_value) {
if (state_ == State::kAborted)
return;
source_url_loader_->SetPriority(priority, intra_priority_value);
}
void MimeSniffingURLLoader::OnBodyReadable(MojoResult) {
if (state_ == State::kSending) {
// The pipe becoming readable when kSending means all buffered body has
// already been sent.
ForwardBodyToClient();
return;
}
DCHECK_EQ(State::kSniffing, state_);
size_t start_size = buffered_body_.size();
size_t read_bytes = net::kMaxBytesToSniff;
buffered_body_.resize(start_size + read_bytes);
MojoResult result = body_consumer_handle_->ReadData(
MOJO_READ_DATA_FLAG_NONE,
base::as_writable_byte_span(buffered_body_)
.subspan(start_size, read_bytes),
read_bytes);
switch (result) {
case MOJO_RESULT_OK:
break;
case MOJO_RESULT_FAILED_PRECONDITION:
// Finished the body before mime type is completely decided.
buffered_body_.resize(start_size);
CompleteSniffing();
return;
case MOJO_RESULT_SHOULD_WAIT:
buffered_body_.resize(start_size);
body_consumer_watcher_.ArmOrNotify();
return;
default:
NOTREACHED();
}
DCHECK_EQ(MOJO_RESULT_OK, result);
buffered_body_.resize(start_size + read_bytes);
std::string new_type;
bool made_final_decision = net::SniffMimeType(
std::string_view(buffered_body_.data(), buffered_body_.size()),
response_url_, response_head_->mime_type,
net::ForceSniffFileUrlsForHtml::kDisabled, &new_type);
response_head_->mime_type = new_type;
response_head_->did_mime_sniff = true;
if (made_final_decision) {
CompleteSniffing();
return;
}
body_consumer_watcher_.ArmOrNotify();
}
void MimeSniffingURLLoader::OnBodyWritable(MojoResult) {
DCHECK_EQ(State::kSending, state_);
if (bytes_remaining_in_buffer_ > 0) {
SendReceivedBodyToClient();
} else {
ForwardBodyToClient();
}
}
void MimeSniffingURLLoader::CompleteSniffing() {
DCHECK_EQ(State::kSniffing, state_);
if (buffered_body_.empty()) {
// The URLLoader ended before sending any data. There is not enough
// information to determine the MIME type.
response_head_->mime_type = kDefaultMimeType;
}
state_ = State::kSending;
bytes_remaining_in_buffer_ = buffered_body_.size();
if (!throttle_) {
Abort();
return;
}
mojo::ScopedDataPipeConsumerHandle body_to_send;
MojoResult result =
mojo::CreateDataPipe(nullptr, body_producer_handle_, body_to_send);
if (result != MOJO_RESULT_OK) {
Abort();
return;
}
throttle_->ResumeWithNewResponseHead(std::move(response_head_),
std::move(body_to_send));
// Set up the watcher for the producer handle.
body_producer_watcher_.Watch(
body_producer_handle_.get(),
MOJO_HANDLE_SIGNAL_WRITABLE | MOJO_HANDLE_SIGNAL_PEER_CLOSED,
base::BindRepeating(&MimeSniffingURLLoader::OnBodyWritable,
base::Unretained(this)));
if (bytes_remaining_in_buffer_) {
SendReceivedBodyToClient();
return;
}
CompleteSending();
}
void MimeSniffingURLLoader::CompleteSending() {
DCHECK_EQ(State::kSending, state_);
state_ = State::kCompleted;
// Call client's OnComplete() if |this|'s OnComplete() has already been
// called.
if (complete_status_.has_value())
destination_url_loader_client_->OnComplete(complete_status_.value());
body_consumer_watcher_.Cancel();
body_producer_watcher_.Cancel();
body_consumer_handle_.reset();
body_producer_handle_.reset();
}
void MimeSniffingURLLoader::SendReceivedBodyToClient() {
DCHECK_EQ(State::kSending, state_);
// Send the buffered data first.
DCHECK_GT(bytes_remaining_in_buffer_, 0u);
base::span<const uint8_t> bytes =
base::as_byte_span(buffered_body_).last(bytes_remaining_in_buffer_);
size_t actually_sent_bytes = 0;
MojoResult result = body_producer_handle_->WriteData(
bytes, MOJO_WRITE_DATA_FLAG_NONE, actually_sent_bytes);
switch (result) {
case MOJO_RESULT_OK:
break;
case MOJO_RESULT_FAILED_PRECONDITION:
// The pipe is closed unexpectedly. |this| should be deleted once
// URLLoader on the destination is released.
Abort();
return;
case MOJO_RESULT_SHOULD_WAIT:
body_producer_watcher_.ArmOrNotify();
return;
default:
NOTREACHED();
}
bytes_remaining_in_buffer_ -= actually_sent_bytes;
body_producer_watcher_.ArmOrNotify();
}
void MimeSniffingURLLoader::ForwardBodyToClient() {
DCHECK_EQ(0u, bytes_remaining_in_buffer_);
// Send the body from the consumer to the producer.
base::span<const uint8_t> buffer;
MojoResult result = body_consumer_handle_->BeginReadData(
MOJO_BEGIN_READ_DATA_FLAG_NONE, buffer);
switch (result) {
case MOJO_RESULT_OK:
break;
case MOJO_RESULT_SHOULD_WAIT:
body_consumer_watcher_.ArmOrNotify();
return;
case MOJO_RESULT_FAILED_PRECONDITION:
// All data has been sent.
CompleteSending();
return;
default:
NOTREACHED();
}
size_t actually_written_bytes = 0;
result = body_producer_handle_->WriteData(buffer, MOJO_WRITE_DATA_FLAG_NONE,
actually_written_bytes);
switch (result) {
case MOJO_RESULT_OK:
break;
case MOJO_RESULT_FAILED_PRECONDITION:
// The pipe is closed unexpectedly. |this| should be deleted once
// URLLoader on the destination is released.
Abort();
return;
case MOJO_RESULT_SHOULD_WAIT:
body_consumer_handle_->EndReadData(0);
body_producer_watcher_.ArmOrNotify();
return;
default:
NOTREACHED();
}
body_consumer_handle_->EndReadData(actually_written_bytes);
body_consumer_watcher_.ArmOrNotify();
}
void MimeSniffingURLLoader::Abort() {
state_ = State::kAborted;
body_consumer_watcher_.Cancel();
body_producer_watcher_.Cancel();
source_url_loader_.reset();
source_url_client_receiver_.reset();
destination_url_loader_client_.reset();
// |this| should be removed since the owner will destroy |this| or the owner
// has already been destroyed by some reason.
}
} // namespace blink
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