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      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 #ifndef CHROME_BROWSER_EXTENSIONS_NAVIGATION_OBSERVER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_NAVIGATION_OBSERVER_H_
      7 
      8 #include <set>
      9 #include <string>
     10 
     11 #include "base/memory/scoped_ptr.h"
     12 #include "chrome/browser/extensions/extension_install_prompt.h"
     13 #include "content/public/browser/notification_observer.h"
     14 #include "content/public/browser/notification_registrar.h"
     15 
     16 class Profile;
     17 
     18 namespace content {
     19 class NavigationController;
     20 }
     21 
     22 namespace extensions {
     23 
     24 // The NavigationObserver listens to navigation notifications. If the user
     25 // navigates into an extension that has been disabled due to a permission
     26 // increase, it prompts the user to accept the new permissions and re-enables
     27 // the extension.
     28 class NavigationObserver : public ExtensionInstallPrompt::Delegate,
     29                            public content::NotificationObserver {
     30  public:
     31   explicit NavigationObserver(Profile* profile);
     32   virtual ~NavigationObserver();
     33 
     34   // content::NotificationObserver
     35   virtual void Observe(int type,
     36                        const content::NotificationSource& source,
     37                        const content::NotificationDetails& details) OVERRIDE;
     38  private:
     39   // Registers for the NOTIFICATION_NAV_ENTRY_COMMITTED notification.
     40   void RegisterForNotifications();
     41 
     42   // Checks if |nav_controller| has entered an extension's web extent. If it
     43   // has and the extension is disabled due to a permissions increase, this
     44   // prompts the user to accept the new permissions and enables the extension.
     45   void PromptToEnableExtensionIfNecessary(
     46       content::NavigationController* nav_controller);
     47 
     48   // ExtensionInstallPrompt::Delegate callbacks used for the permissions prompt.
     49   virtual void InstallUIProceed() OVERRIDE;
     50   virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
     51 
     52   content::NotificationRegistrar registrar_;
     53 
     54   Profile* profile_;
     55 
     56   // The UI used to confirm enabling extensions.
     57   scoped_ptr<ExtensionInstallPrompt> extension_install_prompt_;
     58 
     59   // The data we keep track of when prompting to enable extensions.
     60   std::string in_progress_prompt_extension_id_;
     61   content::NavigationController* in_progress_prompt_navigation_controller_;
     62 
     63   // The extension ids we've already prompted the user about.
     64   std::set<std::string> prompted_extensions_;
     65 
     66   DISALLOW_COPY_AND_ASSIGN(NavigationObserver);
     67 };
     68 
     69 }  // namespace extensions
     70 
     71 #endif  // CHROME_BROWSER_EXTENSIONS_NAVIGATION_OBSERVER_H_
     72