blob: c338306337082140ca67b582918c51b4b1fe1d93 [file] [log] [blame]
// Copyright (C) 2013 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// ValidatingStorage saves data with checksum and timestamp using
// ValidatingUtil.
#include "validating_storage.h"
#include <libaddressinput/callback.h>
#include <libaddressinput/storage.h>
#include <cassert>
#include <cstddef>
#include <ctime>
#include <memory>
#include <string>
#include "validating_util.h"
namespace i18n {
namespace addressinput {
namespace {
class Helper {
public:
Helper(const Helper&) = delete;
Helper& operator=(const Helper&) = delete;
Helper(const std::string& key,
const ValidatingStorage::Callback& data_ready,
const Storage& wrapped_storage)
: data_ready_(data_ready),
wrapped_data_ready_(BuildCallback(this, &Helper::OnWrappedDataReady)) {
wrapped_storage.Get(key, *wrapped_data_ready_);
}
private:
~Helper() {}
void OnWrappedDataReady(bool success,
const std::string& key,
std::string* data) {
if (success) {
assert(data != nullptr);
bool is_stale =
!ValidatingUtil::UnwrapTimestamp(data, std::time(nullptr));
bool is_corrupted = !ValidatingUtil::UnwrapChecksum(data);
success = !is_corrupted && !is_stale;
if (is_corrupted) {
delete data;
data = nullptr;
}
} else {
delete data;
data = nullptr;
}
data_ready_(success, key, data);
delete this;
}
const Storage::Callback& data_ready_;
const std::unique_ptr<const Storage::Callback> wrapped_data_ready_;
};
} // namespace
ValidatingStorage::ValidatingStorage(Storage* storage)
: wrapped_storage_(storage) {
assert(wrapped_storage_ != nullptr);
}
ValidatingStorage::~ValidatingStorage() {}
void ValidatingStorage::Put(const std::string& key, std::string* data) {
assert(data != nullptr);
ValidatingUtil::Wrap(std::time(nullptr), data);
wrapped_storage_->Put(key, data);
}
void ValidatingStorage::Get(const std::string& key,
const Callback& data_ready) const {
new Helper(key, data_ready, *wrapped_storage_);
}
} // namespace addressinput
} // namespace i18n