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// Copyright 2022 Google LLC
//
// 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.
//
////////////////////////////////////////////////////////////////////////////////
#ifndef TINK_INTERNAL_KEY_SERIALIZER_H_
#define TINK_INTERNAL_KEY_SERIALIZER_H_
#include <functional>
#include <memory>
#include <typeindex>
#include <utility>
#include "absl/functional/function_ref.h"
#include "absl/log/log.h"
#include "absl/status/status.h"
#include "absl/types/optional.h"
#include "tink/internal/serialization.h"
#include "tink/internal/serializer_index.h"
#include "tink/key.h"
#include "tink/secret_key_access_token.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace internal {
// Non-template base class that can be used with internal registry map.
class KeySerializer {
public:
// Returns the serialization of `key`.
virtual util::StatusOr<std::unique_ptr<Serialization>> SerializeKey(
const Key& key, absl::optional<SecretKeyAccessToken> token) const = 0;
// Returns an index that can be used to look up the `KeySerializer`
// object registered for the `KeyT` type in a registry.
virtual SerializerIndex Index() const = 0;
virtual ~KeySerializer() = default;
};
// Serializes `KeyT` objects into `SerializationT` objects.
template <typename KeyT, typename SerializationT>
class KeySerializerImpl : public KeySerializer {
public:
// Creates a key serializer with serialization `function`. The referenced
// `function` should outlive the created key serializer object.
explicit KeySerializerImpl(absl::FunctionRef<util::StatusOr<SerializationT>(
KeyT, absl::optional<SecretKeyAccessToken>)>
function)
: function_(function) {}
util::StatusOr<std::unique_ptr<Serialization>> SerializeKey(
const Key& key,
absl::optional<SecretKeyAccessToken> token) const override {
const KeyT* kt = dynamic_cast<const KeyT*>(&key);
if (kt == nullptr) {
return util::Status(absl::StatusCode::kInvalidArgument,
"Invalid key type for this key serializer.");
}
util::StatusOr<SerializationT> serialization = function_(*kt, token);
if (!serialization.ok()) return serialization.status();
return {absl::make_unique<SerializationT>(std::move(*serialization))};
}
SerializerIndex Index() const override {
return SerializerIndex::Create<KeyT, SerializationT>();
}
private:
std::function<util::StatusOr<SerializationT>(
KeyT, absl::optional<SecretKeyAccessToken>)>
function_;
};
} // namespace internal
} // namespace tink
} // namespace crypto
#endif // TINK_INTERNAL_KEY_SERIALIZER_H_
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