|  | // 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/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, 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_ |