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_ACTIVE_TAB_PERMISSION_GRANTER_H_
6#define CHROME_BROWSER_EXTENSIONS_ACTIVE_TAB_PERMISSION_GRANTER_H_
7
8#include <set>
9#include <string>
10
11#include "base/scoped_observer.h"
12#include "content/public/browser/web_contents_observer.h"
13#include "extensions/browser/extension_registry_observer.h"
14#include "extensions/common/extension_set.h"
15#include "extensions/common/url_pattern_set.h"
16
17class Profile;
18
19namespace content {
20class WebContents;
21}
22
23namespace extensions {
24
25class Extension;
26class ExtensionRegistry;
27
28// Responsible for granting and revoking tab-specific permissions to extensions
29// with the activeTab or tabCapture permission.
30class ActiveTabPermissionGranter
31    : public content::WebContentsObserver,
32      public extensions::ExtensionRegistryObserver {
33 public:
34  ActiveTabPermissionGranter(content::WebContents* web_contents,
35                             int tab_id,
36                             Profile* profile);
37  virtual ~ActiveTabPermissionGranter();
38
39  // If |extension| has the activeTab or tabCapture permission, grants
40  // tab-specific permissions to it until the next page navigation or refresh.
41  void GrantIfRequested(const Extension* extension);
42
43 private:
44  // content::WebContentsObserver implementation.
45  virtual void DidNavigateMainFrame(
46      const content::LoadCommittedDetails& details,
47      const content::FrameNavigateParams& params) OVERRIDE;
48  virtual void WebContentsDestroyed() OVERRIDE;
49
50  // extensions::ExtensionRegistryObserver implementation.
51  virtual void OnExtensionUnloaded(content::BrowserContext* browser_context,
52                                   const Extension* extension,
53                                   UnloadedExtensionInfo::Reason reason)
54      OVERRIDE;
55
56  // Clears any tab-specific permissions for all extensions on |tab_id_| and
57  // notifies renderers.
58  void ClearActiveExtensionsAndNotify();
59
60  // The tab ID for this tab.
61  int tab_id_;
62
63  // Extensions with the activeTab permission that have been granted
64  // tab-specific permissions until the next navigation/refresh.
65  ExtensionSet granted_extensions_;
66
67  // Listen to extension unloaded notifications.
68  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
69      extension_registry_observer_;
70
71  DISALLOW_COPY_AND_ASSIGN(ActiveTabPermissionGranter);
72};
73
74}  // namespace extensions
75
76#endif  // CHROME_BROWSER_EXTENSIONS_ACTIVE_TAB_PERMISSION_GRANTER_H_
77