uninstall_metrics.cc revision 868fa2fe829687343ffae624259930155e16dbd8 
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
17namespace installer {
18
19namespace {
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.
25bool 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
47bool 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
73bool 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
91