Implement the mac policy provider based on the AsyncPolicyLoader.

chrome/browser/policy/policy_loader_mac.h

+// Copyright (c) 2012 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_POLICY_POLICY_LOADER_MAC_H_
+#define CHROME_BROWSER_POLICY_POLICY_LOADER_MAC_H_
+#pragma once
+
+#include <CoreFoundation/CoreFoundation.h>
+
+#include "base/file_path.h"
+#include "chrome/browser/policy/async_policy_loader.h"
+#include "chrome/browser/policy/async_policy_provider.h"
+
+class MacPreferences;
+
+namespace base {
+class Value;
+}  // namespace base
+
+namespace policy {
+
+struct PolicyDefinitionList;
+
+// A policy loader that loads policies from the Mac preferences system, and
+// watches the managed preferences files for updates.
+class MacPolicyLoader : public AsyncPolicyLoader {

[Mattias Nissler (ping if slow), 2012/06/04 09:19:02]

Shouldn't the class be named PolicyLoaderMac according to the file name?

[Joao da Silva, 2012/06/04 17:55:14]

I prefer the name MacPolicyLoader, but the file has to end in _mac.h for the
conditional gyp rules to trigger. wdyt?

[Mattias Nissler (ping if slow), 2012/06/05 11:55:59]

The rest of the code base seems to favor the Mac suffix:

git ls-files | grep '_mac.h' | while read file; do grep -r 'class Mac\w\+ '
$file; done | wc -l
-> 4

git ls-files | grep '_mac.h' | while read file; do grep -r 'class \w\+Mac '
$file; done | wc -l
-> 39

[Joao da Silva, 2012/06/05 13:52:10]

Nice! Renaming done.

+ public:
+  MacPolicyLoader(const PolicyDefinitionList* policy_list,
+                  MacPreferences* preferences);
+  virtual ~MacPolicyLoader();
+
+  static AsyncPolicyProvider* CreateProvider(
+      const PolicyDefinitionList* policy_list);
+
+  // AsyncPolicyLoader implementation.
+  virtual void InitOnFile() OVERRIDE;
+  virtual scoped_ptr<PolicyBundle> Load() OVERRIDE;
+  virtual base::Time LastModificationTime() OVERRIDE;
+
+  // Converts a CFPropertyListRef to the equivalent base::Value. CFDictionary
+  // entries whose key is not a CFStringRef are ignored.
+  // The returned value is owned by the caller.

[Mattias Nissler (ping if slow), 2012/06/04 09:19:02]

return a scoped_ptr then?

[Joao da Silva, 2012/06/04 17:55:14]

This is here just so that unit_tests can exercise this function. All the call
sites transfer the pointer to another Dictionary/List immediately, and become
clunkier if they have to .release(). I'd leave as is unless you feel strongly
about it.

[Mattias Nissler (ping if slow), 2012/06/05 11:55:59]

OK.

+  // Returns NULL if an invalid CFType was found, such as CFDate or CFData.
+  static base::Value* CreateValueFromProperty(CFPropertyListRef property);
+
+ private:
+  // List of recognized policies.
+  const PolicyDefinitionList* policy_list_;
+
+  scoped_ptr<MacPreferences> preferences_;
+
+  FilePath managed_policy_path_;

[Mattias Nissler (ping if slow), 2012/06/04 09:19:02]

what's this?

[Joao da Silva, 2012/06/04 17:55:14]

Added a comment.

+
+  DISALLOW_COPY_AND_ASSIGN(MacPolicyLoader);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_POLICY_LOADER_MAC_H_