Home | History | Annotate | Download | only in metrics 
      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