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      1 // Copyright (c) 2011 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 "base/test/test_reg_util_win.h"
      6 
      7 #include "base/guid.h"
      8 #include "base/logging.h"
      9 #include "base/strings/string_number_conversions.h"
     10 #include "base/strings/string_util.h"
     11 #include "base/strings/utf_string_conversions.h"
     12 #include "testing/gtest/include/gtest/gtest.h"
     13 
     14 namespace registry_util {
     15 
     16 namespace {
     17 
     18 const wchar_t kTimestampDelimiter[] = L"$";
     19 const wchar_t kTempTestKeyPath[] = L"Software\\Chromium\\TempTestKeys";
     20 
     21 void DeleteStaleTestKeys(const base::Time& now, const string16& test_key_root) {
     22   base::win::RegKey test_root_key;
     23   if (test_root_key.Open(HKEY_CURRENT_USER,
     24                          test_key_root.c_str(),
     25                          KEY_ALL_ACCESS) != ERROR_SUCCESS) {
     26     // This will occur on first-run, but is harmless.
     27     return;
     28   }
     29 
     30   base::win::RegistryKeyIterator iterator_test_root_key(HKEY_CURRENT_USER,
     31                                                         test_key_root.c_str());
     32   for (; iterator_test_root_key.Valid(); ++iterator_test_root_key) {
     33     string16 key_name = iterator_test_root_key.Name();
     34     std::vector<string16> tokens;
     35     Tokenize(key_name, string16(kTimestampDelimiter), &tokens);
     36     int64 key_name_as_number = 0;
     37 
     38     if (!base::StringToInt64(tokens[0], &key_name_as_number)) {
     39       test_root_key.DeleteKey(key_name.c_str());
     40       continue;
     41     }
     42 
     43     base::Time key_time = base::Time::FromInternalValue(key_name_as_number);
     44     base::TimeDelta age = now - key_time;
     45 
     46     if (age > base::TimeDelta::FromHours(24))
     47       test_root_key.DeleteKey(key_name.c_str());
     48   }
     49 }
     50 
     51 string16 GenerateTempKeyPath(const string16& test_key_root,
     52                              const base::Time& timestamp) {
     53   string16 key_path = test_key_root;
     54   key_path += L"\\" + base::Int64ToString16(timestamp.ToInternalValue());
     55   key_path += kTimestampDelimiter + base::ASCIIToWide(base::GenerateGUID());
     56 
     57   return key_path;
     58 }
     59 
     60 }  // namespace
     61 
     62 RegistryOverrideManager::ScopedRegistryKeyOverride::ScopedRegistryKeyOverride(
     63     HKEY override,
     64     const string16& key_path)
     65     : override_(override) {
     66   EXPECT_EQ(
     67       ERROR_SUCCESS,
     68       temp_key_.Create(HKEY_CURRENT_USER, key_path.c_str(), KEY_ALL_ACCESS));
     69   EXPECT_EQ(ERROR_SUCCESS,
     70             ::RegOverridePredefKey(override_, temp_key_.Handle()));
     71 }
     72 
     73 RegistryOverrideManager::
     74     ScopedRegistryKeyOverride::~ScopedRegistryKeyOverride() {
     75   ::RegOverridePredefKey(override_, NULL);
     76   temp_key_.DeleteKey(L"");
     77 }
     78 
     79 RegistryOverrideManager::RegistryOverrideManager()
     80     : timestamp_(base::Time::Now()), test_key_root_(kTempTestKeyPath) {
     81   DeleteStaleTestKeys(timestamp_, test_key_root_);
     82 }
     83 
     84 RegistryOverrideManager::RegistryOverrideManager(const base::Time& timestamp,
     85                                                  const string16& test_key_root)
     86     : timestamp_(timestamp), test_key_root_(test_key_root) {
     87   DeleteStaleTestKeys(timestamp_, test_key_root_);
     88 }
     89 
     90 RegistryOverrideManager::~RegistryOverrideManager() {}
     91 
     92 void RegistryOverrideManager::OverrideRegistry(
     93     HKEY override,
     94     const string16& /*override_name*/) {
     95   string16 key_path = GenerateTempKeyPath(test_key_root_, timestamp_);
     96   overrides_.push_back(new ScopedRegistryKeyOverride(override, key_path));
     97 }
     98 
     99 string16 GenerateTempKeyPath() {
    100   return GenerateTempKeyPath(string16(kTempTestKeyPath), base::Time::Now());
    101 }
    102 
    103 }  // namespace registry_util
    104