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// Copyright (c) 2012 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_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_
#define CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/scoped_observer.h"
#include "chrome/browser/extensions/extension_install_prompt.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/page_navigator.h"
#include "extensions/browser/extension_registry_observer.h"
class ExtensionEnableFlowDelegate;
namespace content {
class PageNavigator;
class WebContents;
}
namespace extensions {
class ExtensionRegistry;
}
// ExtensionEnableFlow performs an UI flow to enable a disabled/terminated
// extension. It calls its delegate when enabling is done or is aborted.
// Callback on the delegate might be called synchronously if there is no
// permission change while the extension is disabled/terminated (or the
// extension is enabled already). Otherwise, a re-enable install prompt is
// shown to user. The extension is enabled when user acknowledges it or the
// flow is aborted when user declines it.
class ExtensionEnableFlow : public ExtensionInstallPrompt::Delegate,
public content::PageNavigator,
public content::NotificationObserver,
public extensions::ExtensionRegistryObserver {
public:
ExtensionEnableFlow(Profile* profile,
const std::string& extension_id,
ExtensionEnableFlowDelegate* delegate);
virtual ~ExtensionEnableFlow();
// Starts the flow and the logic continues on |delegate_| after enabling is
// finished or aborted. Note that |delegate_| could be called synchronously
// before this call returns when there is no need to show UI to finish the
// enabling flow. Three variations of the flow are supported:
// - one with a parent WebContents
// - one with a native parent window
// - one with a callback for creating a parent window
void StartForWebContents(content::WebContents* parent_contents);
void StartForNativeWindow(gfx::NativeWindow parent_window);
void StartForCurrentlyNonexistentWindow(
base::Callback<gfx::NativeWindow(void)> window_getter);
const std::string& extension_id() const { return extension_id_; }
private:
// Runs the enable flow. It starts by checking if the extension is loaded.
// If not, it tries to reload it. If the load is asynchronous, wait for the
// load to finish before continuing the flow. Otherwise, calls
// CheckPermissionAndMaybePromptUser finish the flow.
void Run();
// Checks if there is permission escalation while the extension is
// disabled/terminated. If no, enables the extension and notify |delegate_|
// synchronously. Otherwise, creates an ExtensionInstallPrompt and asks user
// to confirm.
void CheckPermissionAndMaybePromptUser();
// Creates an ExtensionInstallPrompt in |prompt_|.
void CreatePrompt();
// Starts/stops observing extension load notifications.
void StartObserving();
void StopObserving();
// content::NotificationObserver overrides:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// extensions::ExtensionRegistryObserver overrides:
virtual void OnExtensionLoaded(
content::BrowserContext* browser_context,
const extensions::Extension* extension) OVERRIDE;
virtual void OnExtensionUninstalled(
content::BrowserContext* browser_context,
const extensions::Extension* extension,
extensions::UninstallReason reason) OVERRIDE;
// ExtensionInstallPrompt::Delegate overrides:
virtual void InstallUIProceed() OVERRIDE;
virtual void InstallUIAbort(bool user_initiated) OVERRIDE;
// content::PageNavigator overrides:
virtual content::WebContents* OpenURL(
const content::OpenURLParams& params) OVERRIDE;
Profile* const profile_;
const std::string extension_id_;
ExtensionEnableFlowDelegate* const delegate_; // Not owned.
// Parent web contents for ExtensionInstallPrompt that may be created during
// the flow. Note this is mutually exclusive with |parent_window_| below.
content::WebContents* parent_contents_;
// Parent native window for ExtensionInstallPrompt. Note this is mutually
// exclusive with |parent_contents_| above.
gfx::NativeWindow parent_window_;
// Called to acquire a parent window for the prompt. This is used for clients
// who only want to create a window if it is required.
base::Callback<gfx::NativeWindow(void)> window_getter_;
scoped_ptr<ExtensionInstallPrompt> prompt_;
content::NotificationRegistrar registrar_;
// Listen to extension load notification.
ScopedObserver<extensions::ExtensionRegistry,
extensions::ExtensionRegistryObserver>
extension_registry_observer_;
DISALLOW_COPY_AND_ASSIGN(ExtensionEnableFlow);
};
#endif // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_ENABLE_FLOW_H_
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