chrome/browser/ash/file_system_provider/operations/write_file.cc

// Copyright 2014 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/ash/file_system_provider/operations/write_file.h"

#include <utility>

#include "base/containers/span.h"
#include "base/trace_event/trace_event.h"
#include "base/values.h"
#include "chrome/common/extensions/api/file_system_provider.h"
#include "chrome/common/extensions/api/file_system_provider_internal.h"

namespace ash::file_system_provider::operations {

WriteFile::WriteFile(RequestDispatcher* dispatcher,
                     const ProvidedFileSystemInfo& file_system_info,
                     int file_handle,
                     scoped_refptr<net::IOBuffer> buffer,
                     int64_t offset,
                     size_t length,
                     storage::AsyncFileUtil::StatusCallback callback)
    : Operation(dispatcher, file_system_info),
      file_handle_(file_handle),
      buffer_(buffer),
      offset_(offset),
      length_(length),
      callback_(std::move(callback)) {}

WriteFile::~WriteFile() = default;

bool WriteFile::Execute(int request_id) {
  TRACE_EVENT0("file_system_provider", "WriteFile::Execute");
  using extensions::api::file_system_provider::WriteFileRequestedOptions;

  if (!file_system_info_.writable())
    return false;

  WriteFileRequestedOptions options;
  options.file_system_id = file_system_info_.file_system_id();
  options.request_id = request_id;
  options.open_request_id = file_handle_;
  options.offset = offset_;
  // Length is not passed directly since it can be accessed via data.byteLength.

  // Set the data directly on base::Value() to avoid an extra string copy.
  DCHECK(buffer_.get());

  base::Value::Dict options_as_value = options.ToValue();
  options_as_value.Set(
      "data",
      base::Value(base::as_bytes(base::span(buffer_->data(), length_))));

  base::Value::List event_args;
  event_args.Append(std::move(options_as_value));

  return SendEvent(
      request_id,
      extensions::events::FILE_SYSTEM_PROVIDER_ON_WRITE_FILE_REQUESTED,
      extensions::api::file_system_provider::OnWriteFileRequested::kEventName,
      std::move(event_args));
}

void WriteFile::OnSuccess(/*request_id=*/int,
                          /*result=*/const RequestValue&,
                          /*has_more=*/bool) {
  TRACE_EVENT0("file_system_provider", "WriteFile::OnSuccess");
  DCHECK(callback_);
  std::move(callback_).Run(base::File::FILE_OK);
}

void WriteFile::OnError(/*request_id=*/int,
                        /*result=*/const RequestValue&,
                        base::File::Error error) {
  TRACE_EVENT0("file_system_provider", "WriteFile::OnError");
  DCHECK(callback_);
  std::move(callback_).Run(error);
}

}  // namespace ash::file_system_provider::operations