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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/browser/webshare/store_file_task.h"
#include "base/containers/span.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_util.h"
#include "base/threading/scoped_blocking_call.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "net/base/net_errors.h"
namespace {
bool g_skip_copying_for_testing = false;
} // namespace
namespace webshare {
StoreFileTask::StoreFileTask(base::FilePath filename,
blink::mojom::SharedFilePtr file,
uint64_t& available_space,
blink::mojom::ShareService::ShareCallback callback)
: filename_(std::move(filename)),
file_(std::move(file)),
available_space_(available_space),
callback_(std::move(callback)),
read_pipe_watcher_(FROM_HERE,
mojo::SimpleWatcher::ArmingPolicy::AUTOMATIC) {
// |filename| is generated by GenerateFileName().
DCHECK(!filename_.ReferencesParent());
DCHECK(filename_.BaseName().MaybeAsASCII().find("share") >= 0);
}
StoreFileTask::~StoreFileTask() = default;
void StoreFileTask::Start() {
{
base::ScopedBlockingCall scoped_blocking_call(
FROM_HERE, base::BlockingType::WILL_BLOCK);
output_file_.Initialize(
filename_, base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
}
if (g_skip_copying_for_testing) {
std::move(callback_).Run(blink::mojom::ShareError::OK);
return;
}
StartRead();
}
void StoreFileTask::StartRead() {
constexpr size_t kDataPipeCapacity = 65536;
MojoCreateDataPipeOptions options;
options.struct_size = sizeof(MojoCreateDataPipeOptions);
options.flags = MOJO_CREATE_DATA_PIPE_FLAG_NONE;
options.element_num_bytes = 1;
options.capacity_num_bytes = kDataPipeCapacity;
mojo::ScopedDataPipeProducerHandle producer_handle;
MojoResult rv = CreateDataPipe(&options, producer_handle, consumer_handle_);
if (rv != MOJO_RESULT_OK) {
std::move(callback_).Run(blink::mojom::ShareError::INTERNAL_ERROR);
return;
}
mojo::Remote<blink::mojom::Blob> blob(std::move(file_->blob->blob));
blob->ReadAll(std::move(producer_handle),
receiver_.BindNewPipeAndPassRemote());
}
// static
void StoreFileTask::SkipCopyingForTesting() {
g_skip_copying_for_testing = true;
}
void StoreFileTask::OnDataPipeReadable(MojoResult result) {
if (result != MOJO_RESULT_OK) {
if (!received_all_data_) {
std::move(callback_).Run(blink::mojom::ShareError::INTERNAL_ERROR);
}
return;
}
while (true) {
base::span<const uint8_t> buffer;
MojoResult pipe_result =
consumer_handle_->BeginReadData(MOJO_READ_DATA_FLAG_NONE, buffer);
if (pipe_result == MOJO_RESULT_SHOULD_WAIT)
return;
if (pipe_result == MOJO_RESULT_FAILED_PRECONDITION) {
// Pipe closed.
if (!received_all_data_) {
std::move(callback_).Run(blink::mojom::ShareError::INTERNAL_ERROR);
}
return;
}
if (pipe_result != MOJO_RESULT_OK) {
std::move(callback_).Run(blink::mojom::ShareError::INTERNAL_ERROR);
return;
}
// Defend against compromised renderer process sending too much data.
std::string_view chars = base::as_string_view(buffer);
int chars_size_int = base::saturated_cast<int>(chars.size());
if (buffer.size() > total_bytes_ - bytes_received_ ||
output_file_.WriteAtCurrentPos(chars.data(), chars_size_int) !=
chars_size_int) {
std::move(callback_).Run(blink::mojom::ShareError::INTERNAL_ERROR);
return;
}
bytes_received_ += buffer.size();
DCHECK_LE(bytes_received_, total_bytes_);
consumer_handle_->EndReadData(buffer.size());
if (bytes_received_ == total_bytes_) {
received_all_data_ = true;
if (received_on_complete_)
OnSuccess();
return;
}
}
}
void StoreFileTask::OnSuccess() {
DCHECK_EQ(bytes_received_, total_bytes_);
std::move(callback_).Run(blink::mojom::ShareError::OK);
}
void StoreFileTask::OnCalculatedSize(uint64_t total_size,
uint64_t expected_content_size) {
DCHECK_EQ(total_size, expected_content_size);
if (expected_content_size > *available_space_ ||
expected_content_size != file_->blob->size) {
VLOG(1) << "Share too large: " << expected_content_size << " bytes";
std::move(callback_).Run(blink::mojom::ShareError::PERMISSION_DENIED);
return;
}
*available_space_ -= expected_content_size;
total_bytes_ = expected_content_size;
if (expected_content_size == 0) {
received_all_data_ = true;
return;
}
read_pipe_watcher_.Watch(
consumer_handle_.get(), MOJO_HANDLE_SIGNAL_READABLE,
base::BindRepeating(&StoreFileTask::OnDataPipeReadable,
weak_ptr_factory_.GetWeakPtr()));
}
void StoreFileTask::OnComplete(int32_t status, uint64_t data_length) {
if (status != net::OK || data_length != total_bytes_) {
std::move(callback_).Run(blink::mojom::ShareError::INTERNAL_ERROR);
return;
}
received_on_complete_ = true;
if (received_all_data_)
OnSuccess();
}
} // namespace webshare
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