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      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
     94