Implements the feature notification for Quick Unlock

chrome/browser/chromeos/login/quick_unlock/quick_unlock_notification_controller.cc

+// Copyright (c) 2016 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/login/quick_unlock/quick_unlock_notification_controller.h"
+
+#include "ash/common/system/system_notifier.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/chromeos/login/quick_unlock/pin_storage.h"
+#include "chrome/browser/chromeos/login/quick_unlock/pin_storage_factory.h"
+#include "chrome/browser/notifications/notification.h"
+#include "chrome/browser/notifications/notification_ui_manager.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser_navigator.h"
+#include "chrome/browser/ui/browser_navigator_params.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
+#include "components/prefs/pref_service.h"
+#include "content/public/browser/notification_service.h"
+#include "grit/ash_strings.h"
+#include "grit/theme_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/strings/grit/ui_strings.h"
+
+namespace {
+
+const char kDelegateId[] = "quickunlock_delegate";
+const char kNotificationId[] = "quickunlock_notification";
+const char kChromeAuthenticationSettingsURL[] =
+    "chrome://md-settings/quickUnlock/authenticate";
+
+void UpdatePreferenceForProfile(Profile* profile) {
+  PrefService* pref_service = profile->GetPrefs();
+  pref_service->SetBoolean(prefs::kQuickUnlockFeatureNotificationShown, true);
+}
+
+}  // namespace
+
+namespace chromeos {
+
+QuickUnlockNotificationController::QuickUnlockNotificationController(
+    Profile* profile)
+    : profile_(profile) {
+  registrar_.Add(this, chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED,
+                 content::NotificationService::AllSources());
+}
+
+QuickUnlockNotificationController::~QuickUnlockNotificationController() {
+  UnregisterObserver();
+}
+
+// static
+// TODO(http://crbug.com/291747): Add check for a policy that might disable
+// quick unlock.
+bool QuickUnlockNotificationController::ShouldShow(Profile* profile) {
+  // Do not show the notification if the pin is already set.
+  PinStorage* pin_storage = PinStorageFactory::GetForProfile(profile);
+  if (pin_storage->IsPinSet())
+    return false;
+
+  // Do not show notification if this is a guest session.
+  if (profile->IsGuestSession())
+    return false;

[stevenjb, 2016/07/11 19:55:46]

nit: test this first

[malaykeshav, 2016/07/11 21:55:35]

Done

+
+  // Do not show notification to user if already displayed in the past.
+  if (profile->GetPrefs()->GetBoolean(
+          prefs::kQuickUnlockFeatureNotificationShown)) {
+    return false;
+  }

[stevenjb, 2016/07/11 19:55:46]

nit: check this second (less expensive than getting a PinStorage instance)

[malaykeshav, 2016/07/11 21:55:35]

Done

+
+  // TODO(jdufault): Enable once quick unlock settings land(crbug.com/291747).
+  return false;
+}
+
+// NotificationDelegate override:
+std::string QuickUnlockNotificationController::id() const {
+  return kDelegateId;
+}
+
+void QuickUnlockNotificationController::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  if (type != chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED)
+    return;
+
+  bool is_screen_locked = *content::Details<bool>(details).ptr();
+
+  // Return if the screen is locked, indicating that the notification was
+  // emitted due to a screen lock event.
+  if (is_screen_locked)
+    return;
+

[stevenjb, 2016/07/11 19:55:46]

Should we check ShouldShow here? It seems conceivable that some state may have
changed between when this was constructed and when the event gets fired?

[malaykeshav, 2016/07/11 21:55:35]

+1 
The state may change before the execution reaches this point.
Another call to ShouldShow(profile) will have to be added here.

+  UnregisterObserver();
+
+  // Create and add notification to notification manager.
+  std::unique_ptr<Notification> notification(CreateNotification());
+  g_browser_process->notification_ui_manager()->Add(*notification, profile_);
+}
+
+// message_center::NotificationDelegate override:
+void QuickUnlockNotificationController::Close(bool by_user) {
+  if (by_user)
+    UpdatePreferenceForProfile(profile_);
+}
+
+// message_center::NotificationDelegate override:
+void QuickUnlockNotificationController::Click() {
+  chrome::NavigateParams params(profile_,
+                                GURL(kChromeAuthenticationSettingsURL),
+                                ui::PAGE_TRANSITION_LINK);
+  params.disposition = NEW_FOREGROUND_TAB;
+  params.window_action = chrome::NavigateParams::SHOW_WINDOW;
+  chrome::Navigate(&params);
+
+  UpdatePreferenceForProfile(profile_);
+
+  // Remove the notification from tray.
+  g_browser_process->notification_ui_manager()->CancelById(
+      id(), NotificationUIManager::GetProfileID(profile_));
+}
+
+void QuickUnlockNotificationController::UnregisterObserver() {
+  if (registrar_.IsRegistered(this,
+                              chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED,
+                              content::NotificationService::AllSources())) {
+    registrar_.Remove(this, chrome::NOTIFICATION_SCREEN_LOCK_STATE_CHANGED,
+                      content::NotificationService::AllSources());
+  }
+}
+
+Notification* QuickUnlockNotificationController::CreateNotification() {
+  return new Notification(
+      message_center::NOTIFICATION_TYPE_SIMPLE,
+      l10n_util::GetStringUTF16(IDS_ASH_QUICK_UNLOCK_NOTIFICATION_TITLE),
+      l10n_util::GetStringUTF16(IDS_ASH_QUICK_UNLOCK_NOTIFICATION_BODY),
+      // TODO(http://crbug.com/291747): Change this to actual icon for
+      // quick unlock feature notification.
+      ui::ResourceBundle::GetSharedInstance().GetImageNamed(
+          IDR_SCREENSHOT_NOTIFICATION_ICON),
+      message_center::NotifierId(message_center::NotifierId::SYSTEM_COMPONENT,
+                                 ash::system_notifier::kNotifierQuickUnlock),
+      l10n_util::GetStringUTF16(
+          IDS_MESSAGE_CENTER_NOTIFIER_QUICK_UNLOCK_FEATURE_NAME),
+      GURL(), kNotificationId, message_center::RichNotificationData(), this);
+}
+
+}  // namespace chromeos