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// Copyright 2014 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_USER_PREFS_TRACKED_HASH_STORE_CONTENTS_H_
#define COMPONENTS_USER_PREFS_TRACKED_HASH_STORE_CONTENTS_H_
#include <map>
#include <memory>
#include <string>
#include "base/strings/string_piece.h"
namespace base {
class DictionaryValue;
class Value;
} // namespace base
// Provides access to the contents of a preference hash store. The store
// contains the following data:
// Contents: a client-defined dictionary that should map preference names to
// MACs.
// Version: a client-defined version number for the format of Contents.
// Super MAC: a MAC that authenticates the entirety of Contents.
class HashStoreContents {
public:
virtual ~HashStoreContents() {}
// Returns true if this implementation of HashStoreContents can be copied via
// MakeCopy().
virtual bool IsCopyable() const = 0;
// Returns a copy of this HashStoreContents. Must only be called on
// lightweight implementations (which return true from IsCopyable()) and only
// in scenarios where a copy cannot be avoided.
virtual std::unique_ptr<HashStoreContents> MakeCopy() const = 0;
// Returns the suffix to be appended to UMA histograms for this store type.
// The returned value must either be an empty string or one of the values in
// histograms.xml's TrackedPreferencesExternalValidators.
virtual base::StringPiece GetUMASuffix() const = 0;
// Discards all data related to this hash store.
virtual void Reset() = 0;
// Outputs the MAC validating the preference at path. Returns true if a MAC
// was successfully read and false otherwise.
virtual bool GetMac(const std::string& path, std::string* out_value) = 0;
// Outputs the MACS validating the split preference at path. Returns true if
// MACS were successfully read and false otherwise.
virtual bool GetSplitMacs(const std::string& path,
std::map<std::string, std::string>* out_value) = 0;
// Set the MAC validating the preference at path.
virtual void SetMac(const std::string& path, const std::string& value) = 0;
// Set the MAC validating the split preference at path and split_path.
// For example, |path| is 'extension' and |split_path| is some extenson id.
virtual void SetSplitMac(const std::string& path,
const std::string& split_path,
const std::string& value) = 0;
// Sets the MAC for the preference at |path|.
// If |path| is a split preference |in_value| must be a DictionaryValue whose
// keys are keys in the split preference and whose values are MACs of the
// corresponding values in the split preference.
// If |path| is an atomic preference |in_value| must be a StringValue
// containing a MAC of the preference value.
virtual void ImportEntry(const std::string& path,
const base::Value* in_value) = 0;
// Removes the MAC (for atomic preferences) or MACs (for split preferences)
// at |path|. Returns true if there was an entry at |path| which was
// successfully removed.
virtual bool RemoveEntry(const std::string& path) = 0;
// Only needed if this store supports super MACs.
virtual const base::DictionaryValue* GetContents() const = 0;
// Retrieves the super MAC value previously stored by SetSuperMac. May be
// empty if no super MAC has been stored or if this store does not support
// super MACs.
virtual std::string GetSuperMac() const = 0;
// Stores a super MAC value for this hash store.
virtual void SetSuperMac(const std::string& super_mac) = 0;
};
#endif // COMPONENTS_USER_PREFS_TRACKED_HASH_STORE_CONTENTS_H_
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