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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/file_manager/trash_info_validator.h"
#include <string_view>
#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/notreached.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
class Profile;
namespace file_manager::trash {
namespace {
void RunCallbackWithError(ValidationError error,
ValidateAndParseTrashInfoCallback callback) {
std::move(callback).Run(base::unexpected<ValidationError>(std::move(error)));
}
} // namespace
ParsedTrashInfoData::ParsedTrashInfoData() = default;
ParsedTrashInfoData::~ParsedTrashInfoData() = default;
ParsedTrashInfoData::ParsedTrashInfoData(ParsedTrashInfoData&& other) = default;
ParsedTrashInfoData& ParsedTrashInfoData::operator=(
ParsedTrashInfoData&& other) = default;
std::ostream& operator<<(std::ostream& out, const ValidationError& value) {
switch (value) {
case ValidationError::kFileNotExist:
out << "kFileNotExist";
break;
case ValidationError::kInfoNotExist:
out << "kInfoNotExist";
break;
case ValidationError::kInfoFileInvalidLocation:
out << "kInfoFileInvalidLocation";
break;
case ValidationError::kInfoFileInvalid:
out << "kInfoFileInvalid";
break;
default:
NOTREACHED();
}
return out;
}
base::File::Error ValidationErrorToFileError(ValidationError error) {
switch (error) {
case ValidationError::kFileNotExist:
return base::File::FILE_ERROR_NOT_FOUND;
case ValidationError::kInfoNotExist:
return base::File::FILE_ERROR_NOT_FOUND;
case ValidationError::kInfoFileInvalidLocation:
return base::File::FILE_ERROR_INVALID_URL;
case ValidationError::kInfoFileInvalid:
return base::File::FILE_ERROR_INVALID_OPERATION;
default:
NOTREACHED();
}
}
TrashInfoValidator::TrashInfoValidator(Profile* profile) {
enabled_trash_locations_ =
trash::GenerateEnabledTrashLocationsForProfile(profile);
parser_ = std::make_unique<ash::trash_service::TrashInfoParser>();
}
TrashInfoValidator::~TrashInfoValidator() = default;
void TrashInfoValidator::SetDisconnectHandler(
base::OnceCallback<void()> disconnect_callback) {
DCHECK(parser_) << "Parser should not be null here";
if (parser_) {
parser_->SetDisconnectHandler(std::move(disconnect_callback));
}
}
void TrashInfoValidator::ValidateAndParseTrashInfo(
const base::FilePath& trash_info_path,
ValidateAndParseTrashInfoCallback callback) {
// Validates the supplied file ends in a .trashinfo extension.
if (trash_info_path.FinalExtension() != kTrashInfoExtension) {
RunCallbackWithError(ValidationError::kInfoFileInvalid,
std::move(callback));
return;
}
// Validate the .trashinfo file belongs in an enabled trash location.
base::FilePath trash_folder_location;
base::FilePath mount_point_path;
for (const auto& [parent_path, info] : enabled_trash_locations_) {
if (parent_path.Append(info.relative_folder_path)
.IsParent(trash_info_path)) {
trash_folder_location = parent_path.Append(info.relative_folder_path);
mount_point_path = info.mount_point_path;
break;
}
}
if (mount_point_path.empty() || trash_folder_location.empty()) {
RunCallbackWithError(ValidationError::kInfoFileInvalidLocation,
std::move(callback));
return;
}
// Ensure the corresponding file that this metadata file refers to actually
// exists.
base::FilePath trashed_file_location =
trash_folder_location.Append(kFilesFolderName)
.Append(trash_info_path.BaseName().RemoveFinalExtension());
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()},
base::BindOnce(&base::PathExists, trashed_file_location),
base::BindOnce(&TrashInfoValidator::OnTrashedFileExists,
weak_ptr_factory_.GetWeakPtr(), mount_point_path,
trashed_file_location, std::move(trash_info_path),
std::move(callback)));
}
void TrashInfoValidator::OnTrashedFileExists(
const base::FilePath& mount_point_path,
const base::FilePath& trashed_file_location,
const base::FilePath& trash_info_path,
ValidateAndParseTrashInfoCallback callback,
bool exists) {
if (!exists) {
RunCallbackWithError(ValidationError::kFileNotExist, std::move(callback));
return;
}
auto complete_callback = base::BindPostTaskToCurrentDefault(base::BindOnce(
&TrashInfoValidator::OnTrashInfoParsed, weak_ptr_factory_.GetWeakPtr(),
trash_info_path, mount_point_path, trashed_file_location,
std::move(callback)));
parser_->ParseTrashInfoFile(trash_info_path, std::move(complete_callback));
}
void TrashInfoValidator::OnTrashInfoParsed(
const base::FilePath& trash_info_path,
const base::FilePath& mount_point_path,
const base::FilePath& trashed_file_location,
ValidateAndParseTrashInfoCallback callback,
base::File::Error status,
const base::FilePath& restore_path,
base::Time deletion_date) {
if (status != base::File::FILE_OK) {
RunCallbackWithError((status == base::File::FILE_ERROR_NOT_FOUND)
? ValidationError::kInfoNotExist
: ValidationError::kInfoFileInvalid,
std::move(callback));
return;
}
// The restore path that was parsed could be empty, not have a leading "/" or
// only consist of "/".
if (restore_path.empty() ||
restore_path.value()[0] != base::FilePath::kSeparators[0] ||
(restore_path.value().size() == 1 &&
restore_path.value()[0] == base::FilePath::kSeparators[0])) {
RunCallbackWithError(ValidationError::kInfoFileInvalid,
std::move(callback));
return;
}
// Remove the leading "/" character to make the restore path relative from the
// known trash parent path.
std::string_view relative_path =
std::string_view(restore_path.value()).substr(1);
base::FilePath absolute_restore_path = mount_point_path.Append(relative_path);
ParsedTrashInfoData parsed_data;
parsed_data.trash_info_path = std::move(trash_info_path);
parsed_data.trashed_file_path = std::move(trashed_file_location);
parsed_data.absolute_restore_path = std::move(absolute_restore_path);
parsed_data.deletion_date = std::move(deletion_date);
std::move(callback).Run(
base::ok<ParsedTrashInfoData>(std::move(parsed_data)));
}
} // namespace file_manager::trash
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