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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 SYNC_ENGINE_CRYPTOGRAPHER_PROVIDER_H_
#define SYNC_ENGINE_CRYPTOGRAPHER_PROVIDER_H_
#include "base/memory/scoped_ptr.h"
#include "sync/base/sync_export.h"
namespace syncer {
class Cryptographer;
class ScopedCryptographerRef;
class ScopedCryptographerInternal;
// An interface for providing clients with a ScopedCryptographerRef.
//
// Used to expose the syncable::Directory's cryptographer to clients that
// would otherwise not have access to the Directory.
class SYNC_EXPORT_PRIVATE CryptographerProvider {
public:
CryptographerProvider();
virtual ~CryptographerProvider();
virtual bool InitScopedCryptographerRef(ScopedCryptographerRef* scoped) = 0;
};
// A concrete class representing a reference to a cryptographer.
//
// Access to the cryptographer is lost when this class goes out of scope.
class SYNC_EXPORT_PRIVATE ScopedCryptographerRef {
public:
ScopedCryptographerRef();
~ScopedCryptographerRef();
bool Initialize(ScopedCryptographerInternal* impl);
bool IsValid() const;
Cryptographer* Get() const;
private:
scoped_ptr<ScopedCryptographerInternal> scoped_cryptographer_internal_;
DISALLOW_COPY_AND_ASSIGN(ScopedCryptographerRef);
};
// An interface class used in the implementation of the ScopedCryptographerRef.
//
// We use this class to allow different implementations of
// CryptographerProvider to implement InitScopedCryptographer in different
// ways. The ScopedCryptographerRef itself must be stack-allocated, so it
// can't vary depending on which kind of CryptographerProvider is used to
// intialize it.
class SYNC_EXPORT_PRIVATE ScopedCryptographerInternal {
public:
ScopedCryptographerInternal();
virtual ~ScopedCryptographerInternal();
virtual Cryptographer* Get() const = 0;
};
} // namespace syncer
#endif // SYNC_ENGINE_CRYPTOGRAPHER_PROVIDER_H_
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