[Win] Implement core mechanism to honor Windows Group Policy

chrome/browser/configuration_policy_provider_win.h

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_CONFIGURATION_POLICY_PROVIDER_WIN_H_
+#define CHROME_BROWSER_CONFIGURATION_POLICY_PROVIDER_WIN_H_
+
+#include "chrome/browser/configuration_policy_store.h"
+#include "chrome/browser/configuration_policy_provider.h"
+
+// An implementation of |ConfigurationPolicyProvider| using the
+// mechanism provided by Windows Groups Policy. Policy decisions are
+// stored as values in a special section of the Windows Registry.
+// On a managed machine in a domain, this portion of the registry is
+// periodically updated by the Windows Group Policy machinery to contain
+// the latest version of the policy set by administrators.
+class WinConfigurationPolicyProvider : public ConfigurationPolicyProvider {
+ public:
+  WinConfigurationPolicyProvider();
+  virtual ~WinConfigurationPolicyProvider() { }
+
+  // ConfigurationPolicyProvider method overrides:
+  virtual bool Provide(ConfigurationPolicyStore* store);
+
+ protected:
+  // The sub key path for Chromiums's Group Policy information in the
+  // Windows registry.
+  static const wchar_t kPolicyRegistrySubKey[];
+
+  // Constants specifying the names of policy-specifying registry values
+  // in |kChromiumPolicySubKey|.
+  static const wchar_t kHomepageRegistryValueName[];
+  static const wchar_t kHomepageIsNewTabPageRegistryValueName[];
+  static const wchar_t kCookiesModeRegistryValueName[];
+
+ private:
+  // For each Group Policy registry value that maps to a browser policy, there
+  // is an entry in |registry_to_policy_map_| of type |RegistryPolicyMapEntry|
+  // that specifies the registry value name and the browser policy that it
+  // maps to.
+  struct RegistryPolicyMapEntry {
+    Value::ValueType value_type;
+    ConfigurationPolicyStore::PolicyType policy_type;
+    const wchar_t* registry_value_name;
+  };
+
+  static const RegistryPolicyMapEntry registry_to_policy_map_[];
+
+  // Methods to perfrom type-specific policy lookups in the registry
+  // HKLM is checked fist, then HKLM.
+  bool GetRegistryPolicyString(const wchar_t* value_name, string16* result);
+  bool GetRegistryPolicyBoolean(const wchar_t* value_name, bool* result);
+  bool GetRegistryPolicyInteger(const wchar_t* value_name, uint32* result);
+};
+
+#endif  // CHROME_BROWSER_CONFIGURATION_POLICY_PROVIDER_WIN_H_
+