// 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/weak_ptr.h" class PrefRegistrySimple; class PrefService; namespace metrics { // A struct that holds cloned install related fields in prefs that need to be // reported in the system_profile. struct ClonedInstallInfo { int64_t last_reset_timestamp; int64_t first_reset_timestamp; int reset_count; }; // A class for detecting if an install is cloned. It does this by detecting // when the hardware running Chrome changes. class ClonedInstallDetector { public: ClonedInstallDetector(); ClonedInstallDetector(const ClonedInstallDetector&) = delete; ClonedInstallDetector& operator=(const ClonedInstallDetector&) = delete; 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. void CheckForClonedInstall(PrefService* local_state); static void RegisterPrefs(PrefRegistrySimple* registry); // Reads cloned install info fields from |local_state| and returns them in // a ClonedInstallInfo. static ClonedInstallInfo ReadClonedInstallInfo(PrefService* local_state); // Clears cloned install info fields from |local_state|. static void ClearClonedInstallInfo(PrefService* local_state); // Updates cloned install info fields in |local_state| on reset. static void RecordClonedInstallInfo(PrefService* local_state); // Returns true for the whole session if we detected a cloned install during // the construction of a client id. bool ShouldResetClientIds(PrefService* local_state); // Returns true for the whole session if we detect a cloned install this // session. bool ClonedInstallDetectedInCurrentSession() const; private: FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, SaveId); FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, DetectClone); FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, ShouldResetClientIds); FRIEND_TEST_ALL_PREFIXES(ClonedInstallDetectorTest, ClonedInstallDetectedInCurrentSession); FRIEND_TEST_ALL_PREFIXES(MetricsStateManagerTest, CheckProviderResetIds); // 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); // Indicates that we detected a cloned install during the current session. bool detected_this_session_ = false; // Indicates that we detected a cloned install during the construction of a // client id and should reset client ids as a result. bool should_reset_client_ids_ = false; base::WeakPtrFactory weak_ptr_factory_{this}; }; } // namespace metrics #endif // COMPONENTS_METRICS_CLONED_INSTALL_DETECTOR_H_