1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_APP_PACK_UPDATER_H_ 6 #define CHROME_BROWSER_CHROMEOS_POLICY_APP_PACK_UPDATER_H_ 7 8 #include <string> 9 10 #include "base/basictypes.h" 11 #include "base/callback.h" 12 #include "base/compiler_specific.h" 13 #include "base/files/file_path.h" 14 #include "base/memory/scoped_ptr.h" 15 #include "base/memory/weak_ptr.h" 16 #include "chrome/browser/chromeos/extensions/external_cache.h" 17 #include "chrome/browser/chromeos/settings/cros_settings.h" 18 19 namespace extensions { 20 class ExternalLoader; 21 } 22 23 namespace net { 24 class URLRequestContextGetter; 25 } 26 27 namespace policy { 28 29 class AppPackExternalLoader; 30 class EnterpriseInstallAttributes; 31 32 // The AppPackUpdater manages a set of extensions that are configured via a 33 // device policy to be locally cached and installed into the Demo user account 34 // at login time. 35 class AppPackUpdater : public chromeos::ExternalCache::Delegate { 36 public: 37 // Callback to listen for updates to the screensaver extension's path. 38 typedef base::Callback<void(const base::FilePath&)> ScreenSaverUpdateCallback; 39 40 // The |request_context| is used for the update checks. 41 AppPackUpdater(net::URLRequestContextGetter* request_context, 42 EnterpriseInstallAttributes* install_attributes); 43 virtual ~AppPackUpdater(); 44 45 // Returns true if the ExternalLoader for the app pack has already been 46 // created. created_external_loader()47 bool created_external_loader() const { return created_extension_loader_; } 48 49 // Creates an extensions::ExternalLoader that will load the crx files 50 // downloaded by the AppPackUpdater. This can be called at most once, and the 51 // caller owns the returned value. 52 extensions::ExternalLoader* CreateExternalLoader(); 53 54 // |callback| will be invoked whenever the screen saver extension's path 55 // changes. It will be invoked "soon" after this call if a valid path already 56 // exists. Subsequent calls will override the previous |callback|. A null 57 // |callback| can be used to remove a previous callback. 58 void SetScreenSaverUpdateCallback(const ScreenSaverUpdateCallback& callback); 59 60 // If a user of one of the AppPack's extensions detects that the extension 61 // is damaged then this method can be used to remove it from the cache and 62 // retry to download it after a restart. 63 void OnDamagedFileDetected(const base::FilePath& path); 64 65 private: 66 // Implementation of ExternalCache::Delegate: 67 virtual void OnExtensionListsUpdated( 68 const base::DictionaryValue* prefs) OVERRIDE; 69 70 // Called when the app pack device setting changes. 71 void AppPackChanged(); 72 73 // Loads the current policy and schedules a cache update. 74 void LoadPolicy(); 75 76 // Notifies the |extension_loader_| that the cache has been updated, providing 77 // it with an updated list of app-pack extensions. 78 void UpdateExtensionLoader(); 79 80 // Sets |screen_saver_path_| and invokes |screen_saver_update_callback_| if 81 // appropriate. 82 void SetScreenSaverPath(const base::FilePath& path); 83 84 base::WeakPtrFactory<AppPackUpdater> weak_ptr_factory_; 85 86 // The extension ID and path of the CRX file of the screen saver extension, 87 // if it is configured by the policy. Otherwise these fields are empty. 88 std::string screen_saver_id_; 89 base::FilePath screen_saver_path_; 90 91 // Callback to invoke whenever the screen saver's extension path changes. 92 // Can be null. 93 ScreenSaverUpdateCallback screen_saver_update_callback_; 94 95 // The extension loader wires the AppPackUpdater to the extensions system, and 96 // makes it install the currently cached extensions. 97 bool created_extension_loader_; 98 base::WeakPtr<AppPackExternalLoader> extension_loader_; 99 100 // For checking the device mode. 101 EnterpriseInstallAttributes* install_attributes_; 102 103 // Extension cache. 104 chromeos::ExternalCache external_cache_; 105 106 scoped_ptr<chromeos::CrosSettings::ObserverSubscription> 107 app_pack_subscription_; 108 109 DISALLOW_COPY_AND_ASSIGN(AppPackUpdater); 110 }; 111 112 } // namespace policy 113 114 #endif // CHROME_BROWSER_CHROMEOS_POLICY_APP_PACK_UPDATER_H_ 115