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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.
#include "components/app_restore/full_restore_file_handler.h"
#include <utility>
#include "base/files/file_util.h"
#include "base/files/important_file_writer.h"
#include "base/json/json_string_value_serializer.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "components/app_restore/restore_data.h"
namespace full_restore {
namespace {
const base::FilePath::CharType kFullRestoreDataDirname[] =
FILE_PATH_LITERAL("FullRestoreData");
} // namespace
FullRestoreFileHandler::FullRestoreFileHandler(const base::FilePath& path)
: RefCountedDeleteOnSequence(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskShutdownBehavior::BLOCK_SHUTDOWN})),
file_path_(path.Append(kFullRestoreDataDirname)) {}
void FullRestoreFileHandler::WriteToFile(
std::unique_ptr<app_restore::RestoreData> restore_data) {
if (!restore_data)
return;
std::string json_string;
JSONStringValueSerializer serializer(&json_string);
serializer.Serialize(restore_data->ConvertToValue());
WriteDataBlocking(json_string);
}
std::unique_ptr<app_restore::RestoreData>
FullRestoreFileHandler::ReadFromFile() {
if (!base::PathExists(file_path_))
return std::make_unique<app_restore::RestoreData>();
std::string full_restore_data;
if (!ReadDataBlocking(full_restore_data) || full_restore_data.empty())
return nullptr;
// This JSON file is written by Chrome, so it is safe to deserialise it
// in-process.
base::JSONReader::Result full_restore_value =
base::JSONReader::ReadAndReturnValueWithError(full_restore_data);
if (!full_restore_value.has_value()) {
DVLOG(0)
<< "Fail to deserialize json value from string with error message: "
<< full_restore_value.error().message << ", in line "
<< full_restore_value.error().line << ", column "
<< full_restore_value.error().column;
return nullptr;
}
return std::make_unique<app_restore::RestoreData>(
std::move(*full_restore_value));
}
FullRestoreFileHandler::~FullRestoreFileHandler() = default;
void FullRestoreFileHandler::WriteDataBlocking(
const std::string& full_restore_data) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
if (!base::ImportantFileWriter::WriteFileAtomically(file_path_,
full_restore_data)) {
LOG(ERROR) << "Fail to write full restore data to " << file_path_;
}
}
bool FullRestoreFileHandler::ReadDataBlocking(std::string& full_restore_data) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::MAY_BLOCK);
return base::ReadFileToString(file_path_, &full_restore_data);
}
} // namespace full_restore
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