Add DeviceSettingsService.

chrome/browser/chromeos/login/session_manager_operation.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_CHROMEOS_LOGIN_SESSION_MANAGER_OPERATION_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SESSION_MANAGER_OPERATION_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/login/device_settings_service.h"
+
+namespace enterprise_management {
+class ChromeDeviceSettingsProto;
+class PolicyData;
+}
+
+namespace chromeos {
+
+class OwnerKeyUtil;
+class SessionManagerClient;
+
+// Handles a single transaction with session manager. This is a virtual base
+// class that contains common infrastructure for key and policy loading. There
+// are subclasses for loading, storing and signing policy blobs.
+class SessionManagerOperation {
+ public:
+  typedef base::Callback<void(SessionManagerOperation*,
+                              DeviceSettingsService::Status)>

[pastarmovj, 2012/07/30 12:19:19]

Maybe put Callback on this line?

[Mattias Nissler (ping if slow), 2012/07/31 13:02:15]

Done.

+      Callback;
+
+  // Creates a new load operation.
+  explicit SessionManagerOperation(const Callback& callback);
+  virtual ~SessionManagerOperation();
+
+  // Starts the operation.
+  void Start(SessionManagerClient* session_manager_client,
+             scoped_refptr<OwnerKeyUtil> owner_key_util,
+             scoped_refptr<OwnerKey> owner_key);
+
+  // Restarts a load operation (if that part is already in progress).
+  void RestartLoad(bool key_changed);
+
+  // Accessors for recovering the loaded policy data after completion.
+  scoped_ptr<enterprise_management::PolicyData>& policy_data() {
+    return policy_data_;
+  }
+  scoped_ptr<enterprise_management::ChromeDeviceSettingsProto>&
+      device_settings() {
+    return device_settings_;
+  }
+
+  // Owner key as configured/loaded from disk.
+  scoped_refptr<OwnerKey> owner_key() {
+    return owner_key_;
+  }
+
+  // Whether the load operation is underway.
+  bool is_loading() const {
+    return is_loading_;
+  }
+
+  void set_force_key_load(bool force_key_load) {
+    force_key_load_ = force_key_load;
+  }
+
+ protected:
+  // Runs the operation. The result is reported through |callback_|.
+  virtual void Run() = 0;
+
+  // Ensures the owner key is loaded.
+  void EnsureOwnerKey(const base::Closure& callback);
+
+  // Starts a load operation.
+  void StartLoading();
+
+  // Reports the result status of the operation. Once this gets called, the
+  // operation should not perform further processing or trigger callbacks.
+  void ReportResult(DeviceSettingsService::Status status);
+
+  SessionManagerClient* session_manager_client() {
+    return session_manager_client_;
+  }
+
+ private:
+  // Loads the owner key from disk. Must be run on a thread that can do I/O.
+  static scoped_refptr<OwnerKey> LoadOwnerKey(
+      scoped_refptr<OwnerKeyUtil> util,
+      scoped_refptr<OwnerKey> current_key);
+
+  // Stores the owner key loaded by LoadOwnerKey and calls |callback|.
+  void StoreOwnerKey(const base::Closure& callback,
+                     scoped_refptr<OwnerKey> new_key);
+
+  // Triggers a device settings load.
+  void RetrieveDeviceSettings();
+
+  // Validates device settings after retrieval from session_manager.
+  void ValidateDeviceSettings(const std::string& policy_blob);
+
+  // Extracts status and device settings from the validator and reports them.
+  void ReportValidatorStatus(policy::DeviceCloudPolicyValidator* validator);
+
+  SessionManagerClient* session_manager_client_;
+  scoped_refptr<OwnerKeyUtil> owner_key_util_;
+
+  base::WeakPtrFactory<SessionManagerOperation> weak_factory_;
+
+  Callback callback_;
+
+  scoped_refptr<OwnerKey> owner_key_;
+  bool force_key_load_;
+
+  bool is_loading_;
+  scoped_ptr<enterprise_management::PolicyData> policy_data_;
+  scoped_ptr<enterprise_management::ChromeDeviceSettingsProto> device_settings_;
+
+  DISALLOW_COPY_AND_ASSIGN(SessionManagerOperation);
+};
+
+// This operation loads the public owner key from disk if appropriate, fetches
+// the policy blob from session manager, and validates the loaded policy blob.
+class LoadSettingsOperation : public SessionManagerOperation {
+ public:
+  // Creates a new load operation.
+  explicit LoadSettingsOperation(const Callback& callback);
+  virtual ~LoadSettingsOperation();
+
+ protected:
+  // SessionManagerOperation:
+  virtual void Run() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LoadSettingsOperation);
+};
+
+// Stores a pre-generated policy blob and reloads the device settings from
+// session_manager.
+class StoreSettingsOperation : public SessionManagerOperation {
+ public:
+  // Creates a new store operation.
+  StoreSettingsOperation(const Callback& callback,
+                         const std::string& policy_blob);
+  virtual ~StoreSettingsOperation();
+
+ protected:
+  // SessionManagerOperation:
+  virtual void Run() OVERRIDE;
+
+ private:
+  // Handles the result of the store operation and triggers the load.
+  void HandleStoreResult(bool success);
+
+  std::string policy_blob_;
+
+  base::WeakPtrFactory<StoreSettingsOperation> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(StoreSettingsOperation);
+};
+
+// Signs device settings and stores the resulting blob to session_manager.
+class SignAndStoreSettingsOperation : public SessionManagerOperation {

[pastarmovj, 2012/07/30 12:19:19]

Could this one inherit the StoreSettingsOperation and reduce even further the
need for code duplication?

[Mattias Nissler (ping if slow), 2012/07/31 13:02:15]

Some aspects are identical, others are different (this class doesn't need
policy_blob_, for example). I could make an intermediate base class, but I don't
think the savings justify the additional complexity.

+ public:
+  // Creates a new sign-and-store operation.
+  SignAndStoreSettingsOperation(
+      const Callback& callback,
+      scoped_ptr<enterprise_management::ChromeDeviceSettingsProto> settings,
+      const std::string& username);
+  virtual ~SignAndStoreSettingsOperation();
+
+  // SessionManagerOperation:
+  virtual void Run() OVERRIDE;
+
+ private:
+  // Given an owner key, starts the signing operation.
+  void StartSigning();
+
+  // Builds the policy blob and signs it using the owner key.
+  static std::string AssembleAndSignPolicy(
+      scoped_ptr<enterprise_management::ChromeDeviceSettingsProto> settings,
+      const std::string& username,
+      scoped_refptr<OwnerKey> owner_key);
+
+  // Stores the signed device settings blob.
+  void StoreDeviceSettingsBlob(std::string device_settings_blob);
+
+  // Handles the result of the store operation and triggers the load.
+  void HandleStoreResult(bool success);
+
+  scoped_ptr<enterprise_management::ChromeDeviceSettingsProto> settings_;
+  std::string username_;
+
+  base::WeakPtrFactory<SignAndStoreSettingsOperation> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SignAndStoreSettingsOperation);
+};
+
+}  // namespace
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SESSION_MANAGER_OPERATION_H_