Introduce CloudPolicyClient

chrome/browser/policy/cloud_policy_client.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_CLOUD_POLICY_CLIENT_H_
+#define CHROME_BROWSER_POLICY_CLOUD_POLICY_CLIENT_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
+#include "base/time.h"
+#include "chrome/browser/policy/cloud_policy_constants.h"
+#include "chrome/browser/policy/policy_constants.h"
+
+namespace enterprise_management {
+class DeviceManagementResponse;
+class DeviceRegisterRequest;
+class DeviceStatusReportRequest;
+class PolicyFetchRequest;
+class PolicyFetchResponse;
+class SessionStatusReportRequest;
+}
+
+namespace policy {
+
+class DeviceManagementRequestJob;
+class DeviceManagementService;
+
+// Implements the core logic required to talk to the device management service.
+// Also keeps track of the current state of the association with the service,
+// such as whether there is a valid registration (DMToken is present in that
+// case) and whether and what errors occurred in the latest request.
+//
+// Note that CloudPolicyClient doesn't do any validation of policy responses
+// such as signature and time stamp checks. These happen once the policy gets
+// installed in the cloud policy cache.
+class CloudPolicyClient {
+ public:
+  // Observer interface for state and policy changes.
+  class Observer {
+   public:
+    virtual ~Observer();
+
+    // Called when a policy fetch completes successfully. If a policy fetch
+    // triggers an error, OnClientError() will fire.
+    virtual void OnPolicyFetched(CloudPolicyClient* client) = 0;
+
+    // Called upon registration state changes. This callback is invoked for
+    // successful completion of registration and unregistration requests.
+    virtual void OnRegistrationStateChanged(CloudPolicyClient* client) = 0;
+
+    // Indicates there's been an error in a previously-issued request.
+    virtual void OnClientError(CloudPolicyClient* client) = 0;
+  };
+
+  // Delegate interface for supplying status information to upload to the server
+  // as part of the policy fetch request.
+  class StatusProvider {
+   public:
+    virtual ~StatusProvider();
+
+    // Retrieves status information to send with the next policy fetch.
+    // Implementations must return true if status information was filled in.
+    virtual bool GetDeviceStatus(
+        enterprise_management::DeviceStatusReportRequest* status) = 0;
+    virtual bool GetSessionStatus(
+        enterprise_management::SessionStatusReportRequest* status) = 0;
+
+    // Called after the status information has successfully been submitted to
+    // the server.
+    virtual void OnSubmittedSuccessfully() = 0;
+  };
+
+  // |provider| and |service| are weak pointers and it's the caller's
+  // responsibility to keep them valid for the lifetime of CloudPolicyClient.
+  CloudPolicyClient(const std::string& machine_id,
+                    const std::string& machine_model,
+                    UserAffiliation user_affiliation,
+                    PolicyScope scope,
+                    StatusProvider* provider,
+                    DeviceManagementService* service);
+  virtual ~CloudPolicyClient();
+
+  // Sets the DMToken, thereby establishing a registration with the server. A
+  // policy fetch is not automatically issued but can be requested by calling
+  // FetchPolicy().
+  virtual void SetupRegistration(const std::string& dm_token,
+                                 const std::string& client_id);
+
+  // Attempts to register with the device management service. Results in a
+  // registration change or error notification.
+  virtual void Register(const std::string& auth_token);
+
+  // Requests a policy fetch. The client being registered is a prerequisite to
+  // this operation and this call will CHECK if the client is not in registered
+  // state. FetchPolicy() triggers a policy fetch from the cloud. A policy
+  // change notification is reported to the observers and the new policy blob
+  // can be retrieved once the policy fetch operation completes. In case of
+  // multiple requests to fetch policy, new requests will cancel any pending
+  // requests and the latest request will eventually trigger notifications.
+  virtual void FetchPolicy();
+
+  // Sends an unregistration request to the server.
+  virtual void Unregister();
+
+  // Adds an observer to be called back upon policy and state changes.
+  void AddObserver(Observer* observer);
+
+  // Removes the specified observer.
+  void RemoveObserver(Observer* observer);
+
+  void set_submit_machine_id(bool submit_machine_id) {
+    submit_machine_id_ = submit_machine_id;
+  }
+
+  void set_last_policy_timestamp(const base::Time& timestamp) {
+    last_policy_timestamp_ = timestamp;
+  }
+
+  void set_public_key_version(int public_key_version) {
+    public_key_version_ = public_key_version;
+    public_key_version_valid_ = true;
+  }
+
+  void clear_public_key_version() {
+    public_key_version_valid_ = false;
+  }
+
+  // Whether the client is registered with the device management service.
+  bool is_registered() const { return !dm_token_.empty(); }
+
+  // The policy response as obtained by the last request to the cloud. This
+  // policy blob hasn't gone through verification, so it's contents cannot be
+  // trusted. Use CloudPolicyStore::policy() and CloudPolicyStore::policy_map()
+  // instead for making policy decisions.
+  const enterprise_management::PolicyFetchResponse* policy() const {
+    return policy_.get();
+  }
+
+  DeviceManagementStatus status() const {
+    return status_;
+  }
+
+ protected:
+  // Sets the registration type suitable for the policy scope used.
+  void SetRegistrationType(
+      enterprise_management::DeviceRegisterRequest* request) const;
+
+  // Sets the appropriate policy type in the fetch request.
+  void SetPolicyType(enterprise_management::PolicyFetchRequest* request) const;
+
+  // Callback for registration requests.
+  void OnRegisterCompleted(
+      DeviceManagementStatus status,
+      const enterprise_management::DeviceManagementResponse& response);
+
+  // Callback for policy fetch requests.
+  void OnPolicyFetchCompleted(
+      DeviceManagementStatus status,
+      const enterprise_management::DeviceManagementResponse& response);
+
+  // Callback for unregistration requests.
+  void OnUnregisterCompleted(
+      DeviceManagementStatus status,
+      const enterprise_management::DeviceManagementResponse& response);
+
+  // Observer notification helpers.
+  void NotifyPolicyFetched();
+  void NotifyRegistrationStateChanged();
+  void NotifyClientError();
+
+  // Data necessary for constructing policy requests.
+  const std::string machine_id_;
+  const std::string machine_model_;
+  const UserAffiliation user_affiliation_;
+  const PolicyScope scope_;
+
+  std::string dm_token_;
+  std::string client_id_;
+  bool submit_machine_id_;
+  base::Time last_policy_timestamp_;
+  int public_key_version_;
+  bool public_key_version_valid_;
+
+  // Used for issuing requests to the cloud.
+  DeviceManagementService* service_;
+  scoped_ptr<DeviceManagementRequestJob> request_job_;
+
+  // Status upload data is produced by |status_provider_|.
+  StatusProvider* status_provider_;
+
+  // The policy blob returned by the last policy fetch operation.
+  scoped_ptr<enterprise_management::PolicyFetchResponse> policy_;
+  DeviceManagementStatus status_;
+
+  ObserverList<Observer, true> observers_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CloudPolicyClient);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_CLIENT_H_