1// Copyright 2014 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_SHARED_MODULE_SERVICE_H_
6#define CHROME_BROWSER_EXTENSIONS_SHARED_MODULE_SERVICE_H_
7
8#include <list>
9
10#include "base/scoped_observer.h"
11#include "extensions/browser/extension_registry_observer.h"
12#include "extensions/common/manifest_handlers/shared_module_info.h"
13
14namespace content {
15class BrowserContext;
16}
17
18namespace extensions {
19class Extension;
20class ExtensionSet;
21class ExtensionRegistry;
22
23class SharedModuleService : public ExtensionRegistryObserver {
24 public:
25  enum ImportStatus {
26    // No imports needed.
27    IMPORT_STATUS_OK,
28
29    // Imports are needed, but can be satisfied (i.e., there are missing or
30    // outdated imports for a webstore extension).
31    IMPORT_STATUS_UNSATISFIED,
32
33    // Imports are needed, and can't be satisfied (i.e., missing or outdated
34    // imports for an extension not in the webstore).
35    IMPORT_STATUS_UNRECOVERABLE
36  };
37
38  explicit SharedModuleService(content::BrowserContext* context);
39  virtual ~SharedModuleService();
40
41  // Checks an extension's imports. Imports that are not installed are stored
42  // in |missing_modules|, and imports that are out of date are stored in
43  // |outdated_modules|.
44  ImportStatus CheckImports(
45      const Extension* extension,
46      std::list<SharedModuleInfo::ImportInfo>* missing_modules,
47      std::list<SharedModuleInfo::ImportInfo>* outdated_modules);
48
49  // Checks an extension's shared module imports to see if they are satisfied.
50  // If they are not, this function adds the dependencies to the pending install
51  // list if |extension| came from the webstore.
52  ImportStatus SatisfyImports(const Extension* extension);
53
54  // Returns a set of extensions that import a given extension.
55  scoped_ptr<ExtensionSet> GetDependentExtensions(const Extension* extension);
56
57 private:
58  // Uninstall shared modules which are not used by other extensions.
59  void PruneSharedModules();
60
61  // ExtensionRegistryObserver implementation.
62  virtual void OnExtensionInstalled(content::BrowserContext* browser_context,
63                                    const Extension* extension,
64                                    bool is_update) OVERRIDE;
65  virtual void OnExtensionUninstalled(
66      content::BrowserContext* browser_context,
67      const Extension* extension,
68      extensions::UninstallReason reason) OVERRIDE;
69
70  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
71      extension_registry_observer_;
72
73  // The context associated with this SharedModuleService.
74  content::BrowserContext* browser_context_;
75
76  DISALLOW_COPY_AND_ASSIGN(SharedModuleService);
77};
78
79}  // namespace extensions
80
81#endif  // CHROME_BROWSER_EXTENSIONS_SHARED_MODULE_SERVICE_H_
82