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 virtual void OnExtensionUninstalled( 92 content::BrowserContext* browser_context, 93 const extensions::Extension* extension) OVERRIDE; 94 95 // ExtensionInstallPrompt::Delegate overrides: 96 virtual void InstallUIProceed() OVERRIDE; 97 virtual void InstallUIAbort(bool user_initiated) OVERRIDE; 98 99 // content::PageNavigator overrides: 100 virtual content::WebContents* OpenURL( 101 const content::OpenURLParams& params) OVERRIDE; 102 103 Profile* const profile_; 104 const std::string extension_id_; 105 ExtensionEnableFlowDelegate* const delegate_; // Not owned. 106 107 // Parent web contents for ExtensionInstallPrompt that may be created during 108 // the flow. Note this is mutually exclusive with |parent_window_| below. 109 content::WebContents* parent_contents_; 110 111 // Parent native window for ExtensionInstallPrompt. Note this is mutually 112 // exclusive with |parent_contents_| above. 113 gfx::NativeWindow parent_window_; 114 115 // Called to acquire a parent window for the prompt. This is used for clients 116 // who only want to create a window if it is required. 117 base::Callback<gfx::NativeWindow(void)> window_getter_; 118 119 scoped_ptr<ExtensionInstallPrompt> prompt_; 120 content::NotificationRegistrar registrar_; 121 122 // Listen to extension load notification. 123 ScopedObserver<extensions::ExtensionRegistry, 124 extensions::ExtensionRegistryObserver> 125 extension_registry_observer_; 126 127 DISALLOW_COPY_AND_ASSIGN(ExtensionEnableFlow); 128 }; 129 130 #endif // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_ 131