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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PREFS_TRACKED_PREF_HASH_STORE_H_
#define COMPONENTS_PREFS_TRACKED_PREF_HASH_STORE_H_
#include <memory>
#include <string>
#include "base/values.h"
#include "components/user_prefs/tracked/pref_hash_store_transaction.h"
class HashStoreContents;
class PrefHashStoreTransaction;
// Holds the configuration and implementation used to calculate and verify
// preference MACs.
// TODO(gab): Rename this class as it is no longer a store.
class PrefHashStore {
public:
virtual ~PrefHashStore() {}
// Returns a PrefHashStoreTransaction which can be used to perform a series
// of operations on the hash store. |storage| MAY be used as the backing store
// depending on the implementation. Therefore the HashStoreContents used for
// related transactions should correspond to the same underlying data store.
// |storage| must outlive the returned transaction.
virtual std::unique_ptr<PrefHashStoreTransaction> BeginTransaction(
HashStoreContents* storage) = 0;
// Computes the MAC to be associated with |path| and |value| in this store.
// PrefHashStoreTransaction typically uses this internally but it's also
// exposed for users that want to compute MACs ahead of time for asynchronous
// operations.
virtual std::string ComputeMac(const std::string& path,
const base::Value* value) = 0;
// Computes the MAC to be associated with |path| and |split_values| in this
// store. PrefHashStoreTransaction typically uses this internally but it's
// also exposed for users that want to compute MACs ahead of time for
// asynchronous operations.
virtual std::unique_ptr<base::DictionaryValue> ComputeSplitMacs(
const std::string& path,
const base::DictionaryValue* split_values) = 0;
};
#endif // COMPONENTS_PREFS_TRACKED_PREF_HASH_STORE_H_
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