chrome/installer/gcapi/gcapi_omaha_experiment.cc

   1 // Copyright (c) 2012 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 #include "chrome/installer/gcapi/gcapi_omaha_experiment.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/strings/string_split.h"
   9 #include "base/strings/string_util.h"
  10 #include "base/strings/stringprintf.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/time/time.h"
  13 #include "chrome/installer/gcapi/gcapi.h"
  14 #include "chrome/installer/util/google_update_constants.h"
  15 #include "chrome/installer/util/google_update_experiment_util.h"
  16 #include "chrome/installer/util/google_update_settings.h"
  17
  18 namespace {
  19
  20 // Returns the number of weeks since 2/3/2003.
  21 int GetCurrentRlzWeek(const base::Time& current_time) {
  22   base::Time::Exploded february_third_2003_exploded =
  23       {2003, 2, 1, 3, 0, 0, 0, 0};
  24   base::Time f = base::Time::FromUTCExploded(february_third_2003_exploded);
  25   base::TimeDelta delta = current_time - f;
  26   return delta.InDays() / 7;
  27 }
  28
  29 bool SetExperimentLabel(const wchar_t* brand_code,
  30                         const base::string16& label,
  31                         int shell_mode) {
  32   if (!brand_code) {
  33     return false;
  34   }
  35
  36   const bool system_level = shell_mode == GCAPI_INVOKED_UAC_ELEVATION;
  37
  38   base::string16 original_labels;
  39   if (!GoogleUpdateSettings::ReadExperimentLabels(system_level,
  40                                                   &original_labels)) {
  41     return false;
  42   }
  43
  44   // Split the original labels by the label separator.
  45   std::vector<base::string16> entries;
  46   base::SplitString(original_labels, google_update::kExperimentLabelSeparator,
  47                     &entries);
  48
  49   // Keep all labels, but the one we want to add/replace.
  50   base::string16 label_and_separator(label);
  51   label_and_separator.push_back('=');
  52   base::string16 new_labels;
  53   for (const base::string16& entry : entries) {
  54     if (!entry.empty() &&
  55         !base::StartsWith(entry, label_and_separator,
  56                           base::CompareCase::SENSITIVE)) {
  57       new_labels += entry;
  58       new_labels += google_update::kExperimentLabelSeparator;
  59     }
  60   }
  61
  62   new_labels.append(
  63       gcapi_internals::GetGCAPIExperimentLabel(brand_code, label));
  64
  65   return GoogleUpdateSettings::SetExperimentLabels(system_level,
  66                                                    new_labels);
  67 }
  68
  69 }  // namespace
  70
  71 namespace gcapi_internals {
  72
  73 const wchar_t kReactivationLabel[] = L"reacbrand";
  74 const wchar_t kRelaunchLabel[] = L"relaunchbrand";
  75
  76 base::string16 GetGCAPIExperimentLabel(const wchar_t* brand_code,
  77                                        const base::string16& label) {
  78   // Keeps a fixed time state for this GCAPI instance; this makes tests reliable
  79   // when crossing time boundaries on the system clock and doesn't otherwise
  80   // affect results of this short lived binary.
  81   static time_t instance_time_value = 0;
  82   if (instance_time_value == 0)
  83     instance_time_value = base::Time::Now().ToTimeT();
  84
  85   base::Time instance_time = base::Time::FromTimeT(instance_time_value);
  86
  87   base::string16 gcapi_experiment_label;
  88   base::SStringPrintf(&gcapi_experiment_label,
  89                       L"%ls=%ls_%d|%ls",
  90                       label.c_str(),
  91                       brand_code,
  92                       GetCurrentRlzWeek(instance_time),
  93                       installer::BuildExperimentDateString(
  94                           instance_time).c_str());
  95   return gcapi_experiment_label;
  96 }
  97
  98 }  // namespace gcapi_internals
  99
 100 bool SetReactivationExperimentLabels(const wchar_t* brand_code,
 101                                      int shell_mode) {
 102   return SetExperimentLabel(brand_code, gcapi_internals::kReactivationLabel,
 103                             shell_mode);
 104 }
 105
 106 bool SetRelaunchExperimentLabels(const wchar_t* brand_code, int shell_mode) {
 107   return SetExperimentLabel(brand_code, gcapi_internals::kRelaunchLabel,
 108                             shell_mode);
 109 }