chrome/browser/extensions/api/notifications/notifications_api.cc

   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 #include "chrome/browser/extensions/api/notifications/notifications_api.h"
   6
   7 #include "base/callback.h"
   8 #include "base/guid.h"
   9 #include "base/rand_util.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/time/time.h"
  13 #include "chrome/browser/browser_process.h"
  14 #include "chrome/browser/notifications/notification.h"
  15 #include "chrome/browser/notifications/notification_conversion_helper.h"
  16 #include "chrome/browser/notifications/notification_ui_manager.h"
  17 #include "chrome/browser/notifications/notifier_state_tracker.h"
  18 #include "chrome/browser/notifications/notifier_state_tracker_factory.h"
  19 #include "chrome/browser/profiles/profile.h"
  20 #include "chrome/common/extensions/api/notifications/notification_style.h"
  21 #include "components/keyed_service/content/browser_context_keyed_service_shutdown_notifier_factory.h"
  22 #include "components/keyed_service/core/keyed_service_shutdown_notifier.h"
  23 #include "content/public/browser/render_process_host.h"
  24 #include "content/public/browser/render_view_host.h"
  25 #include "content/public/browser/web_contents.h"
  26 #include "extensions/browser/event_router.h"
  27 #include "extensions/browser/extension_system_provider.h"
  28 #include "extensions/browser/extensions_browser_client.h"
  29 #include "extensions/common/extension.h"
  30 #include "extensions/common/features/feature.h"
  31 #include "third_party/skia/include/core/SkBitmap.h"
  32 #include "ui/base/layout.h"
  33 #include "ui/gfx/image/image.h"
  34 #include "ui/gfx/image/image_skia.h"
  35 #include "ui/gfx/image/image_skia_operations.h"
  36 #include "ui/gfx/image/image_skia_rep.h"
  37 #include "ui/message_center/message_center_style.h"
  38 #include "ui/message_center/notifier_settings.h"
  39 #include "url/gurl.h"
  40
  41 namespace extensions {
  42
  43 namespace notifications = api::notifications;
  44
  45 namespace {
  46
  47 const char kMissingRequiredPropertiesForCreateNotification[] =
  48     "Some of the required properties are missing: type, iconUrl, title and "
  49     "message.";
  50 const char kUnableToDecodeIconError[] =
  51     "Unable to successfully use the provided image.";
  52 const char kUnexpectedProgressValueForNonProgressType[] =
  53     "The progress value should not be specified for non-progress notification";
  54 const char kInvalidProgressValue[] =
  55     "The progress value should range from 0 to 100";
  56 const char kExtraListItemsProvided[] =
  57     "List items provided for notification type != list";
  58 const char kExtraImageProvided[] =
  59     "Image resource provided for notification type != image";
  60
  61 // Given an extension id and another id, returns an id that is unique
  62 // relative to other extensions.
  63 std::string CreateScopedIdentifier(const std::string& extension_id,
  64                                    const std::string& id) {
  65   return extension_id + "-" + id;
  66 }
  67
  68 // Removes the unique internal identifier to send the ID as the
  69 // extension expects it.
  70 std::string StripScopeFromIdentifier(const std::string& extension_id,
  71                                      const std::string& id) {
  72   size_t index_of_separator = extension_id.length() + 1;
  73   DCHECK_LT(index_of_separator, id.length());
  74
  75   return id.substr(index_of_separator);
  76 }
  77
  78 const gfx::ImageSkia CreateSolidColorImage(int width,
  79                                            int height,
  80                                            SkColor color) {
  81   SkBitmap bitmap;
  82   bitmap.allocN32Pixels(width, height);
  83   bitmap.eraseColor(color);
  84   return gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
  85 }
  86
  87 // Take the alpha channel of small_image, mask it with the foreground,
  88 // then add the masked foreground on top of the background
  89 const gfx::Image GetMaskedSmallImage(const gfx::ImageSkia& small_image) {
  90   int width = small_image.width();
  91   int height = small_image.height();
  92
  93   // Background color grey
  94   const gfx::ImageSkia background = CreateSolidColorImage(
  95       width, height, message_center::kSmallImageMaskBackgroundColor);
  96   // Foreground color white
  97   const gfx::ImageSkia foreground = CreateSolidColorImage(
  98       width, height, message_center::kSmallImageMaskForegroundColor);
  99   const gfx::ImageSkia masked_small_image =
 100       gfx::ImageSkiaOperations::CreateMaskedImage(foreground, small_image);
 101   return gfx::Image(gfx::ImageSkiaOperations::CreateSuperimposedImage(
 102       background, masked_small_image));
 103 }
 104
 105 class ShutdownNotifierFactory
 106     : public BrowserContextKeyedServiceShutdownNotifierFactory {
 107  public:
 108   static ShutdownNotifierFactory* GetInstance() {
 109     return base::Singleton<ShutdownNotifierFactory>::get();
 110   }
 111
 112  private:
 113   friend struct base::DefaultSingletonTraits<ShutdownNotifierFactory>;
 114
 115   ShutdownNotifierFactory()
 116       : BrowserContextKeyedServiceShutdownNotifierFactory(
 117             "NotificationsApiDelegate") {
 118     DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
 119   }
 120   ~ShutdownNotifierFactory() override {}
 121
 122   DISALLOW_COPY_AND_ASSIGN(ShutdownNotifierFactory);
 123 };
 124
 125 class NotificationsApiDelegate : public NotificationDelegate {
 126  public:
 127   NotificationsApiDelegate(ChromeAsyncExtensionFunction* api_function,
 128                            Profile* profile,
 129                            const std::string& extension_id,
 130                            const std::string& id)
 131       : api_function_(api_function),
 132         event_router_(EventRouter::Get(profile)),
 133         extension_id_(extension_id),
 134         id_(id),
 135         scoped_id_(CreateScopedIdentifier(extension_id, id)) {
 136     DCHECK(api_function_);
 137     shutdown_notifier_subscription_ =
 138         ShutdownNotifierFactory::GetInstance()->Get(profile)->Subscribe(
 139             base::Bind(&NotificationsApiDelegate::Shutdown,
 140                        base::Unretained(this)));
 141   }
 142
 143   void Close(bool by_user) override {
 144     EventRouter::UserGestureState gesture =
 145         by_user ? EventRouter::USER_GESTURE_ENABLED
 146                 : EventRouter::USER_GESTURE_NOT_ENABLED;
 147     scoped_ptr<base::ListValue> args(CreateBaseEventArgs());
 148     args->Append(new base::FundamentalValue(by_user));
 149     SendEvent(events::NOTIFICATIONS_ON_CLOSED,
 150               notifications::OnClosed::kEventName, gesture, args.Pass());
 151   }
 152
 153   void Click() override {
 154     scoped_ptr<base::ListValue> args(CreateBaseEventArgs());
 155     SendEvent(events::NOTIFICATIONS_ON_CLICKED,
 156               notifications::OnClicked::kEventName,
 157               EventRouter::USER_GESTURE_ENABLED, args.Pass());
 158   }
 159
 160   bool HasClickedListener() override {
 161     if (!event_router_)
 162       return false;
 163
 164     return event_router_->HasEventListener(
 165         notifications::OnClicked::kEventName);
 166   }
 167
 168   void ButtonClick(int index) override {
 169     scoped_ptr<base::ListValue> args(CreateBaseEventArgs());
 170     args->Append(new base::FundamentalValue(index));
 171     SendEvent(events::NOTIFICATIONS_ON_BUTTON_CLICKED,
 172               notifications::OnButtonClicked::kEventName,
 173               EventRouter::USER_GESTURE_ENABLED, args.Pass());
 174   }
 175
 176   std::string id() const override { return scoped_id_; }
 177
 178  private:
 179   ~NotificationsApiDelegate() override {}
 180
 181   void SendEvent(events::HistogramValue histogram_value,
 182                  const std::string& name,
 183                  EventRouter::UserGestureState user_gesture,
 184                  scoped_ptr<base::ListValue> args) {
 185     if (!event_router_)
 186       return;
 187
 188     scoped_ptr<Event> event(new Event(histogram_value, name, args.Pass()));
 189     event->user_gesture = user_gesture;
 190     event_router_->DispatchEventToExtension(extension_id_, event.Pass());
 191   }
 192
 193   void Shutdown() {
 194     event_router_ = nullptr;
 195     shutdown_notifier_subscription_.reset();
 196   }
 197
 198   scoped_ptr<base::ListValue> CreateBaseEventArgs() {
 199     scoped_ptr<base::ListValue> args(new base::ListValue());
 200     args->Append(new base::StringValue(id_));
 201     return args.Pass();
 202   }
 203
 204   scoped_refptr<ChromeAsyncExtensionFunction> api_function_;
 205
 206   // Since this class is refcounted it may outlive the profile.  We listen for
 207   // profile-keyed service shutdown events and reset to nullptr at that time,
 208   // so make sure to check for a valid pointer before use.
 209   EventRouter* event_router_;
 210
 211   const std::string extension_id_;
 212   const std::string id_;
 213   const std::string scoped_id_;
 214
 215   scoped_ptr<KeyedServiceShutdownNotifier::Subscription>
 216       shutdown_notifier_subscription_;
 217
 218   DISALLOW_COPY_AND_ASSIGN(NotificationsApiDelegate);
 219 };
 220
 221 }  // namespace
 222
 223 bool NotificationsApiFunction::IsNotificationsApiAvailable() {
 224   // We need to check this explicitly rather than letting
 225   // _permission_features.json enforce it, because we're sharing the
 226   // chrome.notifications permissions namespace with WebKit notifications.
 227   return extension()->is_platform_app() || extension()->is_extension();
 228 }
 229
 230 NotificationsApiFunction::NotificationsApiFunction() {
 231 }
 232
 233 NotificationsApiFunction::~NotificationsApiFunction() {
 234 }
 235
 236 bool NotificationsApiFunction::CreateNotification(
 237     const std::string& id,
 238     api::notifications::NotificationOptions* options) {
 239   // First, make sure the required fields exist: type, title, message, icon.
 240   // These fields are defined as optional in IDL such that they can be used as
 241   // optional for notification updates. But for notification creations, they
 242   // should be present.
 243   if (options->type == api::notifications::TEMPLATE_TYPE_NONE ||
 244       !options->icon_url || !options->title || !options->message) {
 245     SetError(kMissingRequiredPropertiesForCreateNotification);
 246     return false;
 247   }
 248
 249   NotificationBitmapSizes bitmap_sizes = GetNotificationBitmapSizes();
 250
 251   float image_scale =
 252       ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactors().back());
 253
 254   // Extract required fields: type, title, message, and icon.
 255   message_center::NotificationType type =
 256       MapApiTemplateTypeToType(options->type);
 257   const base::string16 title(base::UTF8ToUTF16(*options->title));
 258   const base::string16 message(base::UTF8ToUTF16(*options->message));
 259   gfx::Image icon;
 260
 261   if (!options->icon_bitmap.get() ||
 262       !NotificationConversionHelper::NotificationBitmapToGfxImage(
 263           image_scale, bitmap_sizes.icon_size, *options->icon_bitmap, &icon)) {
 264     SetError(kUnableToDecodeIconError);
 265     return false;
 266   }
 267
 268   // Then, handle any optional data that's been provided.
 269   message_center::RichNotificationData optional_fields;
 270   if (options->app_icon_mask_url.get()) {
 271     gfx::Image small_icon_mask;
 272     if (!NotificationConversionHelper::NotificationBitmapToGfxImage(
 273             image_scale, bitmap_sizes.app_icon_mask_size,
 274             *options->app_icon_mask_bitmap, &small_icon_mask)) {
 275       SetError(kUnableToDecodeIconError);
 276       return false;
 277     }
 278     optional_fields.small_image =
 279         GetMaskedSmallImage(small_icon_mask.AsImageSkia());
 280   }
 281
 282   if (options->priority.get())
 283     optional_fields.priority = *options->priority;
 284
 285   if (options->event_time.get())
 286     optional_fields.timestamp = base::Time::FromJsTime(*options->event_time);
 287
 288   if (options->buttons.get()) {
 289     // Currently we allow up to 2 buttons.
 290     size_t number_of_buttons = options->buttons->size();
 291     number_of_buttons = number_of_buttons > 2 ? 2 : number_of_buttons;
 292
 293     for (size_t i = 0; i < number_of_buttons; i++) {
 294       message_center::ButtonInfo info(
 295           base::UTF8ToUTF16((*options->buttons)[i]->title));
 296       extensions::api::notifications::NotificationBitmap* icon_bitmap_ptr =
 297           (*options->buttons)[i]->icon_bitmap.get();
 298       if (icon_bitmap_ptr) {
 299         NotificationConversionHelper::NotificationBitmapToGfxImage(
 300             image_scale, bitmap_sizes.button_icon_size, *icon_bitmap_ptr,
 301             &info.icon);
 302       }
 303       optional_fields.buttons.push_back(info);
 304     }
 305   }
 306
 307   if (options->context_message) {
 308     optional_fields.context_message =
 309         base::UTF8ToUTF16(*options->context_message);
 310   }
 311
 312   bool has_image = options->image_bitmap.get() &&
 313                    NotificationConversionHelper::NotificationBitmapToGfxImage(
 314                        image_scale, bitmap_sizes.image_size,
 315                        *options->image_bitmap, &optional_fields.image);
 316
 317   // We should have an image if and only if the type is an image type.
 318   if (has_image != (type == message_center::NOTIFICATION_TYPE_IMAGE)) {
 319     SetError(kExtraImageProvided);
 320     return false;
 321   }
 322
 323   // We should have list items if and only if the type is a multiple type.
 324   bool has_list_items = options->items.get() && options->items->size() > 0;
 325   if (has_list_items != (type == message_center::NOTIFICATION_TYPE_MULTIPLE)) {
 326     SetError(kExtraListItemsProvided);
 327     return false;
 328   }
 329
 330   if (options->progress.get() != NULL) {
 331     // We should have progress if and only if the type is a progress type.
 332     if (type != message_center::NOTIFICATION_TYPE_PROGRESS) {
 333       SetError(kUnexpectedProgressValueForNonProgressType);
 334       return false;
 335     }
 336     optional_fields.progress = *options->progress;
 337     // Progress value should range from 0 to 100.
 338     if (optional_fields.progress < 0 || optional_fields.progress > 100) {
 339       SetError(kInvalidProgressValue);
 340       return false;
 341     }
 342   }
 343
 344   if (has_list_items) {
 345     using api::notifications::NotificationItem;
 346     std::vector<linked_ptr<NotificationItem> >::iterator i;
 347     for (i = options->items->begin(); i != options->items->end(); ++i) {
 348       message_center::NotificationItem item(
 349           base::UTF8ToUTF16(i->get()->title),
 350           base::UTF8ToUTF16(i->get()->message));
 351       optional_fields.items.push_back(item);
 352     }
 353   }
 354
 355   if (options->is_clickable.get())
 356     optional_fields.clickable = *options->is_clickable;
 357
 358   NotificationsApiDelegate* api_delegate(new NotificationsApiDelegate(
 359       this, GetProfile(), extension_->id(), id));  // ownership is passed to
 360                                                    // Notification
 361   Notification notification(
 362       type, title, message, icon,
 363       message_center::NotifierId(message_center::NotifierId::APPLICATION,
 364                                  extension_->id()),
 365       base::UTF8ToUTF16(extension_->name()), extension_->url(),
 366       api_delegate->id(), optional_fields, api_delegate);
 367
 368   g_browser_process->notification_ui_manager()->Add(notification, GetProfile());
 369   return true;
 370 }
 371
 372 bool NotificationsApiFunction::UpdateNotification(
 373     const std::string& id,
 374     api::notifications::NotificationOptions* options,
 375     Notification* notification) {
 376   NotificationBitmapSizes bitmap_sizes = GetNotificationBitmapSizes();
 377   float image_scale =
 378       ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactors().back());
 379
 380   // Update optional fields if provided.
 381   if (options->type != api::notifications::TEMPLATE_TYPE_NONE)
 382     notification->set_type(MapApiTemplateTypeToType(options->type));
 383   if (options->title)
 384     notification->set_title(base::UTF8ToUTF16(*options->title));
 385   if (options->message)
 386     notification->set_message(base::UTF8ToUTF16(*options->message));
 387
 388   if (options->icon_bitmap.get()) {
 389     gfx::Image icon;
 390     if (!NotificationConversionHelper::NotificationBitmapToGfxImage(
 391             image_scale, bitmap_sizes.icon_size, *options->icon_bitmap,
 392             &icon)) {
 393       SetError(kUnableToDecodeIconError);
 394       return false;
 395     }
 396     notification->set_icon(icon);
 397   }
 398
 399   if (options->app_icon_mask_bitmap.get()) {
 400     gfx::Image app_icon_mask;
 401     if (!NotificationConversionHelper::NotificationBitmapToGfxImage(
 402             image_scale, bitmap_sizes.app_icon_mask_size,
 403             *options->app_icon_mask_bitmap, &app_icon_mask)) {
 404       SetError(kUnableToDecodeIconError);
 405       return false;
 406     }
 407     notification->set_small_image(
 408         GetMaskedSmallImage(app_icon_mask.AsImageSkia()));
 409   }
 410
 411   if (options->priority)
 412     notification->set_priority(*options->priority);
 413
 414   if (options->event_time)
 415     notification->set_timestamp(base::Time::FromJsTime(*options->event_time));
 416
 417   if (options->buttons) {
 418     // Currently we allow up to 2 buttons.
 419     size_t number_of_buttons = options->buttons->size();
 420     number_of_buttons = number_of_buttons > 2 ? 2 : number_of_buttons;
 421
 422     std::vector<message_center::ButtonInfo> buttons;
 423     for (size_t i = 0; i < number_of_buttons; i++) {
 424       message_center::ButtonInfo button(
 425           base::UTF8ToUTF16((*options->buttons)[i]->title));
 426       extensions::api::notifications::NotificationBitmap* icon_bitmap_ptr =
 427           (*options->buttons)[i]->icon_bitmap.get();
 428       if (icon_bitmap_ptr) {
 429         NotificationConversionHelper::NotificationBitmapToGfxImage(
 430             image_scale, bitmap_sizes.button_icon_size, *icon_bitmap_ptr,
 431             &button.icon);
 432       }
 433       buttons.push_back(button);
 434     }
 435     notification->set_buttons(buttons);
 436   }
 437
 438   if (options->context_message) {
 439     notification->set_context_message(
 440         base::UTF8ToUTF16(*options->context_message));
 441   }
 442
 443   gfx::Image image;
 444   bool has_image =
 445       options->image_bitmap.get() &&
 446       NotificationConversionHelper::NotificationBitmapToGfxImage(
 447           image_scale, bitmap_sizes.image_size, *options->image_bitmap, &image);
 448
 449   if (has_image) {
 450     // We should have an image if and only if the type is an image type.
 451     if (notification->type() != message_center::NOTIFICATION_TYPE_IMAGE) {
 452       SetError(kExtraImageProvided);
 453       return false;
 454     }
 455     notification->set_image(image);
 456   }
 457
 458   if (options->progress) {
 459     // We should have progress if and only if the type is a progress type.
 460     if (notification->type() != message_center::NOTIFICATION_TYPE_PROGRESS) {
 461       SetError(kUnexpectedProgressValueForNonProgressType);
 462       return false;
 463     }
 464     int progress = *options->progress;
 465     // Progress value should range from 0 to 100.
 466     if (progress < 0 || progress > 100) {
 467       SetError(kInvalidProgressValue);
 468       return false;
 469     }
 470     notification->set_progress(progress);
 471   }
 472
 473   if (options->items.get() && options->items->size() > 0) {
 474     // We should have list items if and only if the type is a multiple type.
 475     if (notification->type() != message_center::NOTIFICATION_TYPE_MULTIPLE) {
 476       SetError(kExtraListItemsProvided);
 477       return false;
 478     }
 479
 480     std::vector<message_center::NotificationItem> items;
 481     using api::notifications::NotificationItem;
 482     std::vector<linked_ptr<NotificationItem> >::iterator i;
 483     for (i = options->items->begin(); i != options->items->end(); ++i) {
 484       message_center::NotificationItem item(
 485           base::UTF8ToUTF16(i->get()->title),
 486           base::UTF8ToUTF16(i->get()->message));
 487       items.push_back(item);
 488     }
 489     notification->set_items(items);
 490   }
 491
 492   // Then override if it's already set.
 493   if (options->is_clickable.get())
 494     notification->set_clickable(*options->is_clickable);
 495
 496   g_browser_process->notification_ui_manager()->Update(*notification,
 497                                                        GetProfile());
 498   return true;
 499 }
 500
 501 bool NotificationsApiFunction::AreExtensionNotificationsAllowed() const {
 502   NotifierStateTracker* notifier_state_tracker =
 503       NotifierStateTrackerFactory::GetForProfile(GetProfile());
 504
 505   return notifier_state_tracker->IsNotifierEnabled(
 506       message_center::NotifierId(message_center::NotifierId::APPLICATION,
 507                                  extension_->id()));
 508 }
 509
 510 bool NotificationsApiFunction::IsNotificationsApiEnabled() const {
 511   return CanRunWhileDisabled() || AreExtensionNotificationsAllowed();
 512 }
 513
 514 bool NotificationsApiFunction::CanRunWhileDisabled() const {
 515   return false;
 516 }
 517
 518 bool NotificationsApiFunction::RunAsync() {
 519   if (IsNotificationsApiAvailable() && IsNotificationsApiEnabled()) {
 520     return RunNotificationsApi();
 521   } else {
 522     SendResponse(false);
 523     return true;
 524   }
 525 }
 526
 527 message_center::NotificationType
 528 NotificationsApiFunction::MapApiTemplateTypeToType(
 529     api::notifications::TemplateType type) {
 530   switch (type) {
 531     case api::notifications::TEMPLATE_TYPE_NONE:
 532     case api::notifications::TEMPLATE_TYPE_BASIC:
 533       return message_center::NOTIFICATION_TYPE_BASE_FORMAT;
 534     case api::notifications::TEMPLATE_TYPE_IMAGE:
 535       return message_center::NOTIFICATION_TYPE_IMAGE;
 536     case api::notifications::TEMPLATE_TYPE_LIST:
 537       return message_center::NOTIFICATION_TYPE_MULTIPLE;
 538     case api::notifications::TEMPLATE_TYPE_PROGRESS:
 539       return message_center::NOTIFICATION_TYPE_PROGRESS;
 540     default:
 541       // Gracefully handle newer application code that is running on an older
 542       // runtime that doesn't recognize the requested template.
 543       return message_center::NOTIFICATION_TYPE_BASE_FORMAT;
 544   }
 545 }
 546
 547 NotificationsCreateFunction::NotificationsCreateFunction() {
 548 }
 549
 550 NotificationsCreateFunction::~NotificationsCreateFunction() {
 551 }
 552
 553 bool NotificationsCreateFunction::RunNotificationsApi() {
 554   params_ = api::notifications::Create::Params::Create(*args_);
 555   EXTENSION_FUNCTION_VALIDATE(params_.get());
 556
 557   const std::string extension_id(extension_->id());
 558   std::string notification_id;
 559   if (params_->notification_id.get() && !params_->notification_id->empty()) {
 560     // If the caller provided a notificationId, use that.
 561     notification_id = *params_->notification_id;
 562   } else {
 563     // Otherwise, use a randomly created GUID. In case that GenerateGUID returns
 564     // the empty string, simply generate a random string.
 565     notification_id = base::GenerateGUID();
 566     if (notification_id.empty())
 567       notification_id = base::RandBytesAsString(16);
 568   }
 569
 570   SetResult(new base::StringValue(notification_id));
 571
 572   // TODO(dewittj): Add more human-readable error strings if this fails.
 573   if (!CreateNotification(notification_id, &params_->options))
 574     return false;
 575
 576   SendResponse(true);
 577
 578   return true;
 579 }
 580
 581 NotificationsUpdateFunction::NotificationsUpdateFunction() {
 582 }
 583
 584 NotificationsUpdateFunction::~NotificationsUpdateFunction() {
 585 }
 586
 587 bool NotificationsUpdateFunction::RunNotificationsApi() {
 588   params_ = api::notifications::Update::Params::Create(*args_);
 589   EXTENSION_FUNCTION_VALIDATE(params_.get());
 590
 591   // We are in update.  If the ID doesn't exist, succeed but call the callback
 592   // with "false".
 593   const Notification* matched_notification =
 594       g_browser_process->notification_ui_manager()->FindById(
 595           CreateScopedIdentifier(extension_->id(), params_->notification_id),
 596           NotificationUIManager::GetProfileID(GetProfile()));
 597   if (!matched_notification) {
 598     SetResult(new base::FundamentalValue(false));
 599     SendResponse(true);
 600     return true;
 601   }
 602
 603   // Copy the existing notification to get a writable version of it.
 604   Notification notification = *matched_notification;
 605
 606   // If we have trouble updating the notification (could be improper use of API
 607   // or some other reason), mark the function as failed, calling the callback
 608   // with false.
 609   // TODO(dewittj): Add more human-readable error strings if this fails.
 610   bool could_update_notification = UpdateNotification(
 611       params_->notification_id, &params_->options, &notification);
 612   SetResult(new base::FundamentalValue(could_update_notification));
 613   if (!could_update_notification)
 614     return false;
 615
 616   // No trouble, created the notification, send true to the callback and
 617   // succeed.
 618   SendResponse(true);
 619   return true;
 620 }
 621
 622 NotificationsClearFunction::NotificationsClearFunction() {
 623 }
 624
 625 NotificationsClearFunction::~NotificationsClearFunction() {
 626 }
 627
 628 bool NotificationsClearFunction::RunNotificationsApi() {
 629   params_ = api::notifications::Clear::Params::Create(*args_);
 630   EXTENSION_FUNCTION_VALIDATE(params_.get());
 631
 632   bool cancel_result = g_browser_process->notification_ui_manager()->CancelById(
 633       CreateScopedIdentifier(extension_->id(), params_->notification_id),
 634       NotificationUIManager::GetProfileID(GetProfile()));
 635
 636   SetResult(new base::FundamentalValue(cancel_result));
 637   SendResponse(true);
 638
 639   return true;
 640 }
 641
 642 NotificationsGetAllFunction::NotificationsGetAllFunction() {}
 643
 644 NotificationsGetAllFunction::~NotificationsGetAllFunction() {}
 645
 646 bool NotificationsGetAllFunction::RunNotificationsApi() {
 647   NotificationUIManager* notification_ui_manager =
 648       g_browser_process->notification_ui_manager();
 649   std::set<std::string> notification_ids =
 650       notification_ui_manager->GetAllIdsByProfileAndSourceOrigin(
 651           NotificationUIManager::GetProfileID(GetProfile()), extension_->url());
 652
 653   scoped_ptr<base::DictionaryValue> result(new base::DictionaryValue());
 654
 655   for (std::set<std::string>::iterator iter = notification_ids.begin();
 656        iter != notification_ids.end(); iter++) {
 657     result->SetBooleanWithoutPathExpansion(
 658         StripScopeFromIdentifier(extension_->id(), *iter), true);
 659   }
 660
 661   SetResult(result.release());
 662   SendResponse(true);
 663
 664   return true;
 665 }
 666
 667 NotificationsGetPermissionLevelFunction::
 668 NotificationsGetPermissionLevelFunction() {}
 669
 670 NotificationsGetPermissionLevelFunction::
 671 ~NotificationsGetPermissionLevelFunction() {}
 672
 673 bool NotificationsGetPermissionLevelFunction::CanRunWhileDisabled() const {
 674   return true;
 675 }
 676
 677 bool NotificationsGetPermissionLevelFunction::RunNotificationsApi() {
 678   api::notifications::PermissionLevel result =
 679       AreExtensionNotificationsAllowed()
 680           ? api::notifications::PERMISSION_LEVEL_GRANTED
 681           : api::notifications::PERMISSION_LEVEL_DENIED;
 682
 683   SetResult(new base::StringValue(api::notifications::ToString(result)));
 684   SendResponse(true);
 685
 686   return true;
 687 }
 688
 689 }  // namespace extensions