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.
GetCurrentRlzWeek(const base::Time & current_time)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
SetExperimentLabel(const wchar_t * brand_code,const base::string16 & label,int shell_mode)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 new_labels;
51 for (std::vector<base::string16>::const_iterator it = entries.begin();
52 it != entries.end(); ++it) {
53 if (!it->empty() && !StartsWith(*it, label + L"=", true)) {
54 new_labels += *it;
55 new_labels += google_update::kExperimentLabelSeparator;
56 }
57 }
58
59 new_labels.append(
60 gcapi_internals::GetGCAPIExperimentLabel(brand_code, label));
61
62 return GoogleUpdateSettings::SetExperimentLabels(system_level,
63 new_labels);
64 }
65
66 } // namespace
67
68 namespace gcapi_internals {
69
70 const wchar_t kReactivationLabel[] = L"reacbrand";
71 const wchar_t kRelaunchLabel[] = L"relaunchbrand";
72
GetGCAPIExperimentLabel(const wchar_t * brand_code,const base::string16 & label)73 base::string16 GetGCAPIExperimentLabel(const wchar_t* brand_code,
74 const base::string16& label) {
75 // Keeps a fixed time state for this GCAPI instance; this makes tests reliable
76 // when crossing time boundaries on the system clock and doesn't otherwise
77 // affect results of this short lived binary.
78 static time_t instance_time_value = 0;
79 if (instance_time_value == 0)
80 instance_time_value = base::Time::Now().ToTimeT();
81
82 base::Time instance_time = base::Time::FromTimeT(instance_time_value);
83
84 base::string16 gcapi_experiment_label;
85 base::SStringPrintf(&gcapi_experiment_label,
86 L"%ls=%ls_%d|%ls",
87 label.c_str(),
88 brand_code,
89 GetCurrentRlzWeek(instance_time),
90 installer::BuildExperimentDateString(
91 instance_time).c_str());
92 return gcapi_experiment_label;
93 }
94
95 } // namespace gcapi_internals
96
SetReactivationExperimentLabels(const wchar_t * brand_code,int shell_mode)97 bool SetReactivationExperimentLabels(const wchar_t* brand_code,
98 int shell_mode) {
99 return SetExperimentLabel(brand_code, gcapi_internals::kReactivationLabel,
100 shell_mode);
101 }
102
SetRelaunchExperimentLabels(const wchar_t * brand_code,int shell_mode)103 bool SetRelaunchExperimentLabels(const wchar_t* brand_code, int shell_mode) {
104 return SetExperimentLabel(brand_code, gcapi_internals::kRelaunchLabel,
105 shell_mode);
106 }
107