1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_ 6 #define COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_ 7 8 #include "base/gtest_prod_util.h" 9 #include "base/memory/ref_counted.h" 10 #include "base/memory/weak_ptr.h" 11 12 class PrefRegistrySimple; 13 class PrefService; 14 15 namespace base { 16 class SingleThreadTaskRunner; 17 } 18 19 namespace metrics { 20 21 class MachineIdProvider; 22 23 // A class for detecting if an install is cloned. It does this by detecting 24 // when the hardware running Chrome changes. 25 class ClonedInstallDetector { 26 public: 27 explicit ClonedInstallDetector(MachineIdProvider* raw_id_provider); 28 virtual ~ClonedInstallDetector(); 29 30 // Posts a task to |task_runner| to generate a machine ID and store it to a 31 // local state pref. If the newly generated ID is different than the 32 // previously stored one, then the install is considered cloned. The ID is a 33 // 24-bit value based off of machine characteristics. This value should never 34 // be sent over the network. 35 // TODO(jwd): Implement change detection. 36 void CheckForClonedInstall( 37 PrefService* local_state, 38 scoped_refptr<base::SingleThreadTaskRunner> task_runner); 39 40 static void RegisterPrefs(PrefRegistrySimple* registry); 41 42 private: 43 FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, SaveId); 44 FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, DetectClone); 45 46 // Converts raw_id into a 24-bit hash and stores the hash in |local_state|. 47 // |raw_id| is not a const ref because it's passed from a cross-thread post 48 // task. 49 void SaveMachineId(PrefService* local_state, std::string raw_id); 50 51 scoped_refptr<MachineIdProvider> raw_id_provider_; 52 base::WeakPtrFactory<ClonedInstallDetector> weak_ptr_factory_; 53 54 DISALLOW_COPY_AND_ASSIGN(ClonedInstallDetector); 55 }; 56 57 } // namespace metrics 58 59 #endif // COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_ 60