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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_METRICS_CLONED_INSTALL_DETECTOR_H_
#define COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
class PrefRegistrySimple;
class PrefService;
namespace base {
class SingleThreadTaskRunner;
}
namespace metrics {
class MachineIdProvider;
// A class for detecting if an install is cloned. It does this by detecting
// when the hardware running Chrome changes.
class ClonedInstallDetector {
public:
explicit ClonedInstallDetector(MachineIdProvider* raw_id_provider);
virtual ~ClonedInstallDetector();
// Posts a task to |task_runner| to generate a machine ID and store it to a
// local state pref. If the newly generated ID is different than the
// previously stored one, then the install is considered cloned. The ID is a
// 24-bit value based off of machine characteristics. This value should never
// be sent over the network.
// TODO(jwd): Implement change detection.
void CheckForClonedInstall(
PrefService* local_state,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
static void RegisterPrefs(PrefRegistrySimple* registry);
private:
FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, SaveId);
FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, DetectClone);
// Converts raw_id into a 24-bit hash and stores the hash in |local_state|.
// |raw_id| is not a const ref because it's passed from a cross-thread post
// task.
void SaveMachineId(PrefService* local_state, const std::string& raw_id);
scoped_refptr<MachineIdProvider> raw_id_provider_;
base::WeakPtrFactory<ClonedInstallDetector> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ClonedInstallDetector);
};
} // namespace metrics
#endif // COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_
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