chrome/installer/util/uninstall_metrics.cc

   1 // Copyright 2013 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/util/uninstall_metrics.h"
   6
   7 #include <string>
   8
   9 #include "base/files/file_path.h"
  10 #include "base/json/json_file_value_serializer.h"
  11 #include "base/logging.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/strings/utf_string_conversions.h"
  14 #include "chrome/common/pref_names.h"
  15 #include "chrome/installer/util/util_constants.h"
  16
  17 namespace installer {
  18
  19 namespace {
  20
  21 // Given a DictionaryValue containing a set of uninstall metrics,
  22 // this builds a URL parameter list of all the contained metrics.
  23 // Returns true if at least one uninstall metric was found in
  24 // uninstall_metrics_dict, false otherwise.
  25 bool BuildUninstallMetricsString(
  26     const base::DictionaryValue* uninstall_metrics_dict,
  27     base::string16* metrics) {
  28   DCHECK(NULL != metrics);
  29   bool has_values = false;
  30
  31   for (base::DictionaryValue::Iterator iter(*uninstall_metrics_dict);
  32        !iter.IsAtEnd();
  33        iter.Advance()) {
  34     has_values = true;
  35     metrics->append(L"&");
  36     metrics->append(base::UTF8ToWide(iter.key()));
  37     metrics->append(L"=");
  38
  39     std::string value;
  40     iter.value().GetAsString(&value);
  41     metrics->append(base::UTF8ToWide(value));
  42   }
  43
  44   return has_values;
  45 }
  46
  47 }  // namespace
  48
  49 bool ExtractUninstallMetrics(const base::DictionaryValue& root,
  50                              base::string16* uninstall_metrics_string) {
  51   // Make sure that the user wants us reporting metrics. If not, don't
  52   // add our uninstall metrics.
  53   bool metrics_reporting_enabled = false;
  54   if (!root.GetBoolean(prefs::kMetricsReportingEnabled,
  55                        &metrics_reporting_enabled) ||
  56       !metrics_reporting_enabled) {
  57     return false;
  58   }
  59
  60   const base::DictionaryValue* uninstall_metrics_dict = NULL;
  61   if (!root.HasKey(installer::kUninstallMetricsName) ||
  62       !root.GetDictionary(installer::kUninstallMetricsName,
  63                           &uninstall_metrics_dict)) {
  64     return false;
  65   }
  66
  67   if (!BuildUninstallMetricsString(uninstall_metrics_dict,
  68                                    uninstall_metrics_string)) {
  69     return false;
  70   }
  71
  72   return true;
  73 }
  74
  75 bool ExtractUninstallMetricsFromFile(const base::FilePath& file_path,
  76                                      base::string16* uninstall_metrics_string) {
  77   JSONFileValueSerializer json_serializer(file_path);
  78
  79   std::string json_error_string;
  80   scoped_ptr<base::Value> root(json_serializer.Deserialize(NULL, NULL));
  81   if (!root.get())
  82     return false;
  83
  84   // Preferences should always have a dictionary root.
  85   if (!root->IsType(base::Value::TYPE_DICTIONARY))
  86     return false;
  87
  88   return ExtractUninstallMetrics(
  89       *static_cast<base::DictionaryValue*>(root.get()),
  90       uninstall_metrics_string);
  91 }
  92
  93 }  // namespace installer