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// 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_POLICY_APP_PACK_UPDATER_H_
#define CHROME_BROWSER_CHROMEOS_POLICY_APP_PACK_UPDATER_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "chrome/browser/chromeos/extensions/external_cache.h"
#include "chrome/browser/chromeos/settings/cros_settings.h"
namespace extensions {
class ExternalLoader;
}
namespace net {
class URLRequestContextGetter;
}
namespace policy {
class AppPackExternalLoader;
class EnterpriseInstallAttributes;
// The AppPackUpdater manages a set of extensions that are configured via a
// device policy to be locally cached and installed into the Demo user account
// at login time.
class AppPackUpdater : public chromeos::ExternalCache::Delegate {
public:
// Callback to listen for updates to the screensaver extension's path.
typedef base::Callback<void(const base::FilePath&)> ScreenSaverUpdateCallback;
// The |request_context| is used for the update checks.
AppPackUpdater(net::URLRequestContextGetter* request_context,
EnterpriseInstallAttributes* install_attributes);
virtual ~AppPackUpdater();
// Returns true if the ExternalLoader for the app pack has already been
// created.
bool created_external_loader() const { return created_extension_loader_; }
// Creates an extensions::ExternalLoader that will load the crx files
// downloaded by the AppPackUpdater. This can be called at most once, and the
// caller owns the returned value.
extensions::ExternalLoader* CreateExternalLoader();
// |callback| will be invoked whenever the screen saver extension's path
// changes. It will be invoked "soon" after this call if a valid path already
// exists. Subsequent calls will override the previous |callback|. A null
// |callback| can be used to remove a previous callback.
void SetScreenSaverUpdateCallback(const ScreenSaverUpdateCallback& callback);
// If a user of one of the AppPack's extensions detects that the extension
// is damaged then this method can be used to remove it from the cache and
// retry to download it after a restart.
void OnDamagedFileDetected(const base::FilePath& path);
private:
// Implementation of ExternalCache::Delegate:
virtual void OnExtensionListsUpdated(
const base::DictionaryValue* prefs) OVERRIDE;
// Called when the app pack device setting changes.
void AppPackChanged();
// Loads the current policy and schedules a cache update.
void LoadPolicy();
// Notifies the |extension_loader_| that the cache has been updated, providing
// it with an updated list of app-pack extensions.
void UpdateExtensionLoader();
// Sets |screen_saver_path_| and invokes |screen_saver_update_callback_| if
// appropriate.
void SetScreenSaverPath(const base::FilePath& path);
base::WeakPtrFactory<AppPackUpdater> weak_ptr_factory_;
// The extension ID and path of the CRX file of the screen saver extension,
// if it is configured by the policy. Otherwise these fields are empty.
std::string screen_saver_id_;
base::FilePath screen_saver_path_;
// Callback to invoke whenever the screen saver's extension path changes.
// Can be null.
ScreenSaverUpdateCallback screen_saver_update_callback_;
// The extension loader wires the AppPackUpdater to the extensions system, and
// makes it install the currently cached extensions.
bool created_extension_loader_;
base::WeakPtr<AppPackExternalLoader> extension_loader_;
// For checking the device mode.
EnterpriseInstallAttributes* install_attributes_;
// Extension cache.
chromeos::ExternalCache external_cache_;
scoped_ptr<chromeos::CrosSettings::ObserverSubscription>
app_pack_subscription_;
DISALLOW_COPY_AND_ASSIGN(AppPackUpdater);
};
} // namespace policy
#endif // CHROME_BROWSER_CHROMEOS_POLICY_APP_PACK_UPDATER_H_
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