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 DictionaryValue* uninstall_metrics_dict, string16* metrics) {
  27   DCHECK(NULL != metrics);
  28   bool has_values = false;
  29
  30   for (DictionaryValue::Iterator iter(*uninstall_metrics_dict); !iter.IsAtEnd();
  31        iter.Advance()) {
  32     has_values = true;
  33     metrics->append(L"&");
  34     metrics->append(UTF8ToWide(iter.key()));
  35     metrics->append(L"=");
  36
  37     std::string value;
  38     iter.value().GetAsString(&value);
  39     metrics->append(UTF8ToWide(value));
  40   }
  41
  42   return has_values;
  43 }
  44
  45 }  // namespace
  46
  47 bool ExtractUninstallMetrics(const DictionaryValue& root,
  48                              string16* uninstall_metrics_string) {
  49   // Make sure that the user wants us reporting metrics. If not, don't
  50   // add our uninstall metrics.
  51   bool metrics_reporting_enabled = false;
  52   if (!root.GetBoolean(prefs::kMetricsReportingEnabled,
  53                        &metrics_reporting_enabled) ||
  54       !metrics_reporting_enabled) {
  55     return false;
  56   }
  57
  58   const DictionaryValue* uninstall_metrics_dict = NULL;
  59   if (!root.HasKey(installer::kUninstallMetricsName) ||
  60       !root.GetDictionary(installer::kUninstallMetricsName,
  61                           &uninstall_metrics_dict)) {
  62     return false;
  63   }
  64
  65   if (!BuildUninstallMetricsString(uninstall_metrics_dict,
  66                                    uninstall_metrics_string)) {
  67     return false;
  68   }
  69
  70   return true;
  71 }
  72
  73 bool ExtractUninstallMetricsFromFile(const base::FilePath& file_path,
  74                                      string16* uninstall_metrics_string) {
  75   JSONFileValueSerializer json_serializer(file_path);
  76
  77   std::string json_error_string;
  78   scoped_ptr<Value> root(json_serializer.Deserialize(NULL, NULL));
  79   if (!root.get())
  80     return false;
  81
  82   // Preferences should always have a dictionary root.
  83   if (!root->IsType(Value::TYPE_DICTIONARY))
  84     return false;
  85
  86   return ExtractUninstallMetrics(*static_cast<DictionaryValue*>(root.get()),
  87                                  uninstall_metrics_string);
  88 }
  89
  90 }  // namespace installer