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 CHROME_BROWSER_METRICS_EXTENSIONS_METRICS_PROVIDER_H_ 6 #define CHROME_BROWSER_METRICS_EXTENSIONS_METRICS_PROVIDER_H_ 7 8 #include <string> 9 10 #include "base/basictypes.h" 11 #include "base/memory/scoped_ptr.h" 12 #include "components/metrics/metrics_provider.h" 13 14 class Profile; 15 16 namespace extensions { 17 class ExtensionSet; 18 } 19 20 namespace metrics { 21 class MetricsStateManager; 22 class SystemProfileProto; 23 } 24 25 // ExtensionsMetricsProvider groups various constants and functions used for 26 // reporting extension IDs with UMA reports (after hashing the extension IDs 27 // for privacy). 28 class ExtensionsMetricsProvider : public metrics::MetricsProvider { 29 public: 30 // Holds on to |metrics_state_manager|, which must outlive this object, as a 31 // weak pointer. 32 explicit ExtensionsMetricsProvider( 33 metrics::MetricsStateManager* metrics_state_manager); 34 virtual ~ExtensionsMetricsProvider(); 35 36 // metrics::MetricsProvider: 37 38 // Writes the hashed list of installed extensions into the specified 39 // SystemProfileProto object. 40 virtual void ProvideSystemProfileMetrics( 41 metrics::SystemProfileProto* system_profile) OVERRIDE; 42 43 protected: 44 // Exposed for the sake of mocking in test code. 45 46 // Retrieves the set of extensions installed in the current profile. 47 // TODO(mvrable): If metrics are ever converted to being per-profile, then 48 // this should be updated to return extensions installed in a specified 49 // profile. 50 virtual scoped_ptr<extensions::ExtensionSet> GetInstalledExtensions(); 51 52 // Retrieves the client ID. 53 virtual uint64 GetClientID(); 54 55 // Hashes the extension extension ID using the provided client key (which 56 // must be less than kExtensionListClientKeys) and to produce an output value 57 // between 0 and kExtensionListBuckets-1. 58 static int HashExtension(const std::string& extension_id, uint32 client_key); 59 60 private: 61 // Returns the profile for which extensions will be gathered. Once a 62 // suitable profile has been found, future calls will continue to return the 63 // same value so that reported extensions are consistent. 64 Profile* GetMetricsProfile(); 65 66 // The MetricsStateManager from which the client ID is obtained. 67 metrics::MetricsStateManager* metrics_state_manager_; 68 69 // The profile for which extensions are gathered. Once a profile is found 70 // its value is cached here so that GetMetricsProfile() can return a 71 // consistent value. 72 Profile* cached_profile_; 73 74 DISALLOW_COPY_AND_ASSIGN(ExtensionsMetricsProvider); 75 }; 76 77 #endif // CHROME_BROWSER_METRICS_EXTENSIONS_METRICS_PROVIDER_H_ 78