Verify that the notification response contains sensible data

chrome/browser/notifications/notification_platform_bridge_mac.h

 // Copyright 2015 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_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_MAC_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_MAC_H_
 
 #include <set>
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "chrome/browser/notifications/notification_platform_bridge.h"
 
 class Notification;
 @class NotificationCenterDelegate;
 @class NSUserNotificationCenter;
 class PrefService;
 
 // This class is an implementation of NotificationPlatformBridge that will
 // send platform notifications to the the MacOSX notification center.
 class NotificationPlatformBridgeMac : public NotificationPlatformBridge {
  public:
   explicit NotificationPlatformBridgeMac(
       NSUserNotificationCenter* notification_center);
   ~NotificationPlatformBridgeMac() override;
 
   // NotificationPlatformBridge implementation.
   void Display(const std::string& notification_id,
                const std::string& profile_id,
                bool incognito,
                const Notification& notification) override;
   void Close(const std::string& profile_id,
              const std::string& notification_id) override;
   bool GetDisplayed(const std::string& profile_id,
                     bool incognito,
                     std::set<std::string>* notifications) const override;
   bool SupportsNotificationCenter() const override;
 
+  // Validates contents of the |response| dictionary as received from the system
+  // when a notification gets activated.
+  static bool VerifyNotificationData(NSDictionary* response) WARN_UNUSED_RESULT;
+
  private:
   // Cocoa class that receives callbacks from the NSUserNotificationCenter.
   base::scoped_nsobject<NotificationCenterDelegate> delegate_;
 
   // The notification center to use, this can be overriden in tests
   NSUserNotificationCenter* notification_center_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationPlatformBridgeMac);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_PLATFORM_BRIDGE_MAC_H_