chrome/browser/ui/extensions/extension_enable_flow.h

   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_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_
   6 #define CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/scoped_observer.h"
  14 #include "chrome/browser/extensions/extension_install_prompt.h"
  15 #include "content/public/browser/notification_observer.h"
  16 #include "content/public/browser/notification_registrar.h"
  17 #include "content/public/browser/page_navigator.h"
  18 #include "extensions/browser/extension_registry_observer.h"
  19
  20 class ExtensionEnableFlowDelegate;
  21
  22 namespace content {
  23 class PageNavigator;
  24 class WebContents;
  25 }
  26
  27 namespace extensions {
  28 class ExtensionRegistry;
  29 }
  30
  31 // ExtensionEnableFlow performs an UI flow to enable a disabled/terminated
  32 // extension. It calls its delegate when enabling is done or is aborted.
  33 // Callback on the delegate might be called synchronously if there is no
  34 // permission change while the extension is disabled/terminated (or the
  35 // extension is enabled already). Otherwise, a re-enable install prompt is
  36 // shown to user. The extension is enabled when user acknowledges it or the
  37 // flow is aborted when user declines it.
  38 class ExtensionEnableFlow : public ExtensionInstallPrompt::Delegate,
  39                             public content::PageNavigator,
  40                             public content::NotificationObserver,
  41                             public extensions::ExtensionRegistryObserver {
  42  public:
  43   ExtensionEnableFlow(Profile* profile,
  44                       const std::string& extension_id,
  45                       ExtensionEnableFlowDelegate* delegate);
  46   virtual ~ExtensionEnableFlow();
  47
  48   // Starts the flow and the logic continues on |delegate_| after enabling is
  49   // finished or aborted. Note that |delegate_| could be called synchronously
  50   // before this call returns when there is no need to show UI to finish the
  51   // enabling flow. Three variations of the flow are supported:
  52   //   - one with a parent WebContents
  53   //   - one with a native parent window
  54   //   - one with a callback for creating a parent window
  55   void StartForWebContents(content::WebContents* parent_contents);
  56   void StartForNativeWindow(gfx::NativeWindow parent_window);
  57   void StartForCurrentlyNonexistentWindow(
  58       base::Callback<gfx::NativeWindow(void)> window_getter);
  59
  60   const std::string& extension_id() const { return extension_id_; }
  61
  62  private:
  63   // Runs the enable flow. It starts by checking if the extension is loaded.
  64   // If not, it tries to reload it. If the load is asynchronous, wait for the
  65   // load to finish before continuing the flow. Otherwise, calls
  66   // CheckPermissionAndMaybePromptUser finish the flow.
  67   void Run();
  68
  69   // Checks if there is permission escalation while the extension is
  70   // disabled/terminated. If no, enables the extension and notify |delegate_|
  71   // synchronously. Otherwise, creates an ExtensionInstallPrompt and asks user
  72   // to confirm.
  73   void CheckPermissionAndMaybePromptUser();
  74
  75   // Creates an ExtensionInstallPrompt in |prompt_|.
  76   void CreatePrompt();
  77
  78   // Starts/stops observing extension load notifications.
  79   void StartObserving();
  80   void StopObserving();
  81
  82   // content::NotificationObserver overrides:
  83   virtual void Observe(int type,
  84                        const content::NotificationSource& source,
  85                        const content::NotificationDetails& details) OVERRIDE;
  86
  87   // extensions::ExtensionRegistryObserver overrides:
  88   virtual void OnExtensionLoaded(
  89       content::BrowserContext* browser_context,
  90       const extensions::Extension* extension) OVERRIDE;
  91
  92   // ExtensionInstallPrompt::Delegate overrides:
  93   virtual void InstallUIProceed() OVERRIDE;
  94   virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
  95
  96   // content::PageNavigator overrides:
  97   virtual content::WebContents* OpenURL(
  98       const content::OpenURLParams& params) OVERRIDE;
  99
 100   Profile* const profile_;
 101   const std::string extension_id_;
 102   ExtensionEnableFlowDelegate* const delegate_;  // Not owned.
 103
 104   // Parent web contents for ExtensionInstallPrompt that may be created during
 105   // the flow. Note this is mutually exclusive with |parent_window_| below.
 106   content::WebContents* parent_contents_;
 107
 108   // Parent native window for ExtensionInstallPrompt. Note this is mutually
 109   // exclusive with |parent_contents_| above.
 110   gfx::NativeWindow parent_window_;
 111
 112   // Called to acquire a parent window for the prompt. This is used for clients
 113   // who only want to create a window if it is required.
 114   base::Callback<gfx::NativeWindow(void)> window_getter_;
 115
 116   scoped_ptr<ExtensionInstallPrompt> prompt_;
 117   content::NotificationRegistrar registrar_;
 118
 119   // Listen to extension load notification.
 120   ScopedObserver<extensions::ExtensionRegistry,
 121                  extensions::ExtensionRegistryObserver>
 122       extension_registry_observer_;
 123
 124   DISALLOW_COPY_AND_ASSIGN(ExtensionEnableFlow);
 125 };
 126
 127 #endif  // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_