First CL for the about:policy page. This only implements the policy section of the page.

chrome/browser/policy/configuration_policy_reader.h

+// Copyright (c) 2011 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_CONFIGURATION_POLICY_READER_H_
+#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_READER_H_
+#pragma once
+
+#include "base/scoped_ptr.h"
+#include "base/values.h"
+#include "chrome/browser/policy/configuration_policy_provider.h"
+#include "chrome/browser/policy/policy_status_info.h"
+
+namespace policy {
+
+class ConfigurationPolicyStatusKeeper;
+
+// This class reads policy information from a ConfigurationPolicyProvider in
+// order to determine the status of a policy (this includes it's value and
+// whether it could be enforced on the client or not), as required by the
+// about:policy UI.
+class ConfigurationPolicyReader : public ConfigurationPolicyProvider::Observer {
+  public:
+   virtual ~ConfigurationPolicyReader();
+
+   bool IsInitializationComplete() const;
+
+   // ConfigurationPolicyProvider::Observer methods:
+   virtual void OnUpdatePolicy();
+   virtual void OnProviderGoingAway();
+
+   // Creates a ConfigurationPolicyReader that reads managed platform
+   // policy.
+   static ConfigurationPolicyReader*
+       CreateManagedPlatformPolicyReader(
+       PolicyStatusInfo::PolicyLevel policy_level);
+
+   // Creates a ConfigurationPolicyReader that reads managed cloud policy.
+   static ConfigurationPolicyReader*
+       CreateManagedCloudPolicyReader(
+       PolicyStatusInfo::PolicyLevel policy_level);
+
+   // Creates a ConfigurationPolicyReader that reads recommended cloud policy.
+   static ConfigurationPolicyReader*
+         CreateRecommendedPlatformPolicyReader(
+         PolicyStatusInfo::PolicyLevel policy_level);
+
+   // Creates a ConfigurationPolicyReader that reads recommended cloud policy.
+   static ConfigurationPolicyReader*
+         CreateRecommendedCloudPolicyReader(
+         PolicyStatusInfo::PolicyLevel policy_level);
+
+   // Returns a pointer to a DictionaryValue object containing policy status
+   // information for the UI. Ownership of the return value is acquired by the
+   // caller. Returns NULL if the reader is not aware of the given policy.
+   DictionaryValue* GetPolicyStatus(ConfigurationPolicyType policy) const;
+
+  private:
+   ConfigurationPolicyReader(ConfigurationPolicyProvider* provider,
+                                    PolicyStatusInfo::PolicyLevel policy_level);
+
+   // Updates the policy information held in this reader. This is called when
+   // the ConfigurationPolicyProvider is updated.
+   void Refresh();
+
+   // The policy provider from which policy settings are read.
+   ConfigurationPolicyProvider* provider_;
+
+   bool initialization_complete_;
+
+   // Whether this ConfigurationPolicyReader contains managed policies.
+   PolicyStatusInfo::PolicyLevel policy_level_;
+
+   // Current policy status.
+   scoped_ptr<ConfigurationPolicyStatusKeeper> policy_keeper_;
+
+   ConfigurationPolicyObserverRegistrar registrar_;
+
+   DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyReader);
+};
+
+// This class combines the policy information from different
+// ConfigurationPolicyReaders into a single list of policy information that the
+// about:policy UI can display.
+class PolicyStatus {
+
+  public:
+   PolicyStatus();
+   ~PolicyStatus();
+
+   // Returns a ListValue pointer containing the status information of all
+   // policies supported by the client. This is for the about:policy UI to
+   // display.
+   ListValue* GetPolicyStatusList() const;
+
+  private:
+   typedef ConfigurationPolicyProvider::PolicyDefinitionList
+       PolicyDefinitionList;
+
+   // Add the policy information for |policy| to the ListValue pointed to be
+   // |list| as it is returned by the different ConfigurationPolicyReader
+   // objects. Returns true if a policy was added and false otherwise.
+   bool AddPolicyFromReaders(ConfigurationPolicyType policy,
+                              ListValue* list) const;
+
+   scoped_ptr<ConfigurationPolicyReader> managed_platform_;
+   scoped_ptr<ConfigurationPolicyReader> managed_cloud_;
+   scoped_ptr<ConfigurationPolicyReader> recommended_platform_;
+   scoped_ptr<ConfigurationPolicyReader> recommended_cloud_;
+
+   DISALLOW_COPY_AND_ASSIGN(PolicyStatus);
+};
+
+} // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_READER_H_