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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.
#include "chrome/browser/chromeos/screensaver/screensaver_controller.h"
#include "ash/screensaver/screensaver_view.h"
#include "ash/shell.h"
#include "ash/wm/user_activity_detector.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_system.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/extensions/extension.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/power_manager_client.h"
#include "content/public/browser/notification_service.h"
namespace {
const int kScreensaverTimeoutMinutes = 2;
ExtensionService* GetDefaultExtensionService() {
Profile* default_profile = ProfileManager::GetDefaultProfile();
DCHECK(default_profile);
ExtensionService* service =
extensions::ExtensionSystem::Get(default_profile)->extension_service();
DCHECK(service);
return service;
}
// Find the screensaver extension for the given service, excluding
// the one with exclude_id.
std::string FindScreensaverExtension(ExtensionService* service,
const std::string& exclude_id) {
const ExtensionSet* extensions = service->extensions();
if (!extensions)
return std::string();
for (ExtensionSet::const_iterator it = extensions->begin();
it != extensions->end();
++it) {
const extensions::Extension* extension = *it;
if (extension &&
extension->id() != exclude_id &&
extension->HasAPIPermission(extensions::APIPermission::kScreensaver)) {
return extension->id();
}
}
return std::string();
}
void UninstallPreviousScreensavers(const extensions::Extension* current) {
Profile* default_profile = ProfileManager::GetDefaultProfile();
DCHECK(default_profile);
ExtensionService* service =
extensions::ExtensionSystem::Get(default_profile)->extension_service();
DCHECK(service);
std::string screensaver_id;
while ((screensaver_id = FindScreensaverExtension(service, current->id()))
!= "") {
string16 error;
if (!service->UninstallExtension(screensaver_id, false, &error))
LOG(ERROR)
<< "Couldn't uninstall previous screensaver extension with id: "
<< screensaver_id << " \nError: " << error;
}
}
} // namespace
namespace chromeos {
ScreensaverController::ScreensaverController()
: threshold_(base::TimeDelta::FromMinutes(kScreensaverTimeoutMinutes)),
weak_ptr_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
// Register for extension changes.
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_LOADED,
content::NotificationService::AllSources());
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
content::NotificationService::AllSources());
std::string screensaver_extension_id =
FindScreensaverExtension(GetDefaultExtensionService(), std::string());
if (!screensaver_extension_id.empty())
SetupScreensaver(screensaver_extension_id);
}
ScreensaverController::~ScreensaverController() {
TeardownScreensaver();
}
void ScreensaverController::Observe(
int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
switch (type) {
case chrome::NOTIFICATION_EXTENSION_INSTALLED: {
const extensions::Extension* extension =
content::Details<const extensions::Extension>(details).ptr();
// Uninstall any previously installed screensaver extensions if a new
// screensaver extension is installed.
if (extension->HasAPIPermission(extensions::APIPermission::kScreensaver))
UninstallPreviousScreensavers(extension);
break;
}
case chrome::NOTIFICATION_EXTENSION_LOADED: {
const extensions::Extension* extension =
content::Details<const extensions::Extension>(details).ptr();
if (extension->HasAPIPermission(extensions::APIPermission::kScreensaver))
SetupScreensaver(extension->id());
break;
}
case chrome::NOTIFICATION_EXTENSION_UNLOADED: {
const extensions::Extension* extension =
content::Details<extensions::UnloadedExtensionInfo>(
details)->extension;
if (extension->id() == screensaver_extension_id_)
TeardownScreensaver();
break;
}
}
}
void ScreensaverController::IdleNotify(int64 threshold) {
ExtensionService* service = GetDefaultExtensionService();
const extensions::Extension* screensaver_extension =
service->GetExtensionById(screensaver_extension_id_,
ExtensionService::INCLUDE_ENABLED);
ash::ShowScreensaver(screensaver_extension->GetFullLaunchURL());
if (!ash::Shell::GetInstance()->user_activity_detector()->HasObserver(this))
ash::Shell::GetInstance()->user_activity_detector()->AddObserver(this);
}
void ScreensaverController::OnUserActivity() {
// We don't want to handle further user notifications; we'll either login
// the user and close out or or at least close the screensaver.
if (ash::Shell::GetInstance()->user_activity_detector()->HasObserver(this))
ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this);
ash::CloseScreensaver();
RequestNextIdleNotification();
}
void ScreensaverController::SetupScreensaver(
const std::string& screensaver_extension_id) {
screensaver_extension_id_ = screensaver_extension_id;
PowerManagerClient* power_manager =
DBusThreadManager::Get()->GetPowerManagerClient();
if (!power_manager->HasObserver(this))
power_manager->AddObserver(this);
RequestNextIdleNotification();
}
void ScreensaverController::TeardownScreensaver() {
PowerManagerClient* power_manager =
DBusThreadManager::Get()->GetPowerManagerClient();
if (power_manager && power_manager->HasObserver(this))
power_manager->RemoveObserver(this);
if (ash::Shell::GetInstance() &&
ash::Shell::GetInstance()->user_activity_detector()->HasObserver(this)) {
ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this);
}
ash::CloseScreensaver();
screensaver_extension_id_ = "";
}
void ScreensaverController::RequestNextIdleNotification() {
DBusThreadManager::Get()->GetPowerManagerClient()->
RequestIdleNotification(threshold_.InMilliseconds());
}
} // namespace chromeos
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