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chrome/browser/google/google_update.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_GOOGLE_GOOGLE_UPDATE_H_
-#define CHROME_BROWSER_GOOGLE_GOOGLE_UPDATE_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/string16.h"
-#if defined(OS_WIN)
-#include "google_update/google_update_idl.h"
-#endif
-
-class MessageLoop;
-namespace views {
-class Widget;
-}
-
-// The status of the upgrade. UPGRADE_STARTED and UPGRADE_CHECK_STARTED are
-// internal states and will not be reported as results to the listener.
-enum GoogleUpdateUpgradeResult {
-  // The upgrade has started.
-  UPGRADE_STARTED = 0,
-  // A check for upgrade has been initiated.
-  UPGRADE_CHECK_STARTED,
-  // An update is available.
-  UPGRADE_IS_AVAILABLE,
-  // The upgrade happened successfully.
-  UPGRADE_SUCCESSFUL,
-  // No need to upgrade, we are up to date.
-  UPGRADE_ALREADY_UP_TO_DATE,
-  // An error occurred.
-  UPGRADE_ERROR,
-};
-
-enum GoogleUpdateErrorCode {
-  // The upgrade completed successfully (or hasn't been started yet).
-  GOOGLE_UPDATE_NO_ERROR = 0,
-  // Google Update only supports upgrading if Chrome is installed in the default
-  // location. This error will appear for developer builds and with
-  // installations unzipped to random locations.
-  CANNOT_UPGRADE_CHROME_IN_THIS_DIRECTORY,
-  // Failed to create Google Update JobServer COM class.
-  GOOGLE_UPDATE_JOB_SERVER_CREATION_FAILED,
-  // Failed to create Google Update OnDemand COM class.
-  GOOGLE_UPDATE_ONDEMAND_CLASS_NOT_FOUND,
-  // Google Update OnDemand COM class reported an error during a check for
-  // update (or while upgrading).
-  GOOGLE_UPDATE_ONDEMAND_CLASS_REPORTED_ERROR,
-  // A call to GetResults failed.
-  GOOGLE_UPDATE_GET_RESULT_CALL_FAILED,
-  // A call to GetVersionInfo failed.
-  GOOGLE_UPDATE_GET_VERSION_INFO_FAILED,
-  // An error occurred while upgrading (or while checking for update).
-  // Check the Google Update log in %TEMP% for more details.
-  GOOGLE_UPDATE_ERROR_UPDATING,
-  // Updates can not be downloaded because the administrator has disabled them.
-  GOOGLE_UPDATE_DISABLED_BY_POLICY,
-};
-
-// The GoogleUpdateStatusListener interface is used by components to receive
-// notifications about the results of an Google Update operation.
-class GoogleUpdateStatusListener {
- public:
-  // This function is called when Google Update has finished its operation and
-  // wants to notify us about the results. |results| represents what the end
-  // state is, |error_code| represents what error occurred, |error_message| is a
-  // string version of the same (might be blank) and |version| specifies what
-  // new version Google Update detected (or installed). This value can be a
-  // blank string, if the version tag in the Update{} block (in Google Update's
-  // server config for Chrome) is blank.
-  virtual void OnReportResults(GoogleUpdateUpgradeResult results,
-                               GoogleUpdateErrorCode error_code,
-                               const string16& error_message,
-                               const string16& version) = 0;
-};
-
-////////////////////////////////////////////////////////////////////////////////
-//
-// The Google Update class is responsible for communicating with Google Update
-// and get it to perform operations on our behalf (for example, CheckForUpdate).
-// This class will report back to its parent via the GoogleUpdateStatusListener
-// interface and will delete itself after reporting back.
-//
-////////////////////////////////////////////////////////////////////////////////
-class GoogleUpdate : public base::RefCountedThreadSafe<GoogleUpdate> {
- public:
-  GoogleUpdate();
-
-  // Ask Google Update to see if a new version is available. If the parameter
-  // |install_if_newer| is true then Google Update will also install that new
-  // version.
-  // |window| should point to a foreground window. This is needed to ensure
-  // that Vista/Windows 7 UAC prompts show up in the foreground. It may also
-  // be null.
-  void CheckForUpdate(bool install_if_newer, views::Widget* window);
-
-  // Pass NULL to clear the listener
-  void set_status_listener(GoogleUpdateStatusListener* listener) {
-    listener_ = listener;
-  }
-
- private:
-  friend class base::RefCountedThreadSafe<GoogleUpdate>;
-
-  virtual ~GoogleUpdate();
-
-// The chromeos implementation is in browser/chromeos/google_update.cpp
-
-#if defined(OS_WIN)
-
-  // This function reports failure from the Google Update operation to the
-  // listener.
-  // Note, after this function completes, this object will have deleted itself.
-  bool ReportFailure(HRESULT hr, GoogleUpdateErrorCode error_code,
-                     const string16& error_message, MessageLoop* main_loop);
-
-#endif
-
-  // We need to run the update check on another thread than the main thread, and
-  // therefore CheckForUpdate will delegate to this function. |main_loop| points
-  // to the message loop that we want the response to come from.
-  // |window| should point to a foreground window. This is needed to ensure that
-  // Vista/Windows 7 UAC prompts show up in the foreground. It may also be null.
-  void InitiateGoogleUpdateCheck(bool install_if_newer, views::Widget* window,
-                                 MessageLoop* main_loop);
-
-  // This function reports the results of the GoogleUpdate operation to the
-  // listener. If results indicates an error, the |error_code| and
-  // |error_message| will indicate which error occurred.
-  // Note, after this function completes, this object will have deleted itself.
-  void ReportResults(GoogleUpdateUpgradeResult results,
-                     GoogleUpdateErrorCode error_code,
-                     const string16& error_message);
-
-  // Which version string Google Update found (if a new one was available).
-  // Otherwise, this will be blank.
-  string16 version_available_;
-
-  // The listener who is interested in finding out the result of the operation.
-  GoogleUpdateStatusListener* listener_;
-
-  DISALLOW_COPY_AND_ASSIGN(GoogleUpdate);
-};
-
-#endif  // CHROME_BROWSER_GOOGLE_GOOGLE_UPDATE_H_