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 EXTENSIONS_BROWSER_EXTENSION_SYSTEM_H_
6#define EXTENSIONS_BROWSER_EXTENSION_SYSTEM_H_
7
8#include <string>
9
10#include "base/memory/ref_counted.h"
11#include "components/keyed_service/core/keyed_service.h"
12#include "extensions/common/extension.h"
13
14class ExtensionService;
15
16#if defined(OS_CHROMEOS)
17namespace chromeos {
18class DeviceLocalAccountManagementPolicyProvider;
19}
20#endif  // defined(OS_CHROMEOS)
21
22namespace content {
23class BrowserContext;
24}
25
26namespace extensions {
27
28class Blacklist;
29class ContentVerifier;
30class DeclarativeUserScriptMaster;
31class ErrorConsole;
32class EventRouter;
33class Extension;
34class ExtensionSet;
35class InfoMap;
36class InstallVerifier;
37class LazyBackgroundTaskQueue;
38class ManagementPolicy;
39class OneShotEvent;
40class ProcessManager;
41class QuotaService;
42class RuntimeData;
43class SharedUserScriptMaster;
44class StateStore;
45class WarningService;
46
47// ExtensionSystem manages the lifetime of many of the services used by the
48// extensions and apps system, and it handles startup and shutdown as needed.
49// Eventually, we'd like to make more of these services into KeyedServices in
50// their own right.
51class ExtensionSystem : public KeyedService {
52 public:
53  ExtensionSystem();
54  virtual ~ExtensionSystem();
55
56  // Returns the instance for the given browser context, or NULL if none.
57  static ExtensionSystem* Get(content::BrowserContext* context);
58
59  // Initializes extensions machinery.
60  // Component extensions are always enabled, external and user extensions are
61  // controlled by |extensions_enabled|.
62  virtual void InitForRegularProfile(bool extensions_enabled) = 0;
63
64  // The ExtensionService is created at startup.
65  virtual ExtensionService* extension_service() = 0;
66
67  // Per-extension data that can change during the life of the process but
68  // does not persist across restarts. Lives on UI thread. Created at startup.
69  virtual RuntimeData* runtime_data() = 0;
70
71  // The class controlling whether users are permitted to perform certain
72  // actions on extensions (install, uninstall, disable, etc.).
73  // The ManagementPolicy is created at startup.
74  virtual ManagementPolicy* management_policy() = 0;
75
76  // The SharedUserScriptMaster is created at startup.
77  virtual SharedUserScriptMaster* shared_user_script_master() = 0;
78
79  // The ProcessManager is created at startup.
80  virtual ProcessManager* process_manager() = 0;
81
82  // The StateStore is created at startup.
83  virtual StateStore* state_store() = 0;
84
85  // The rules store is created at startup.
86  virtual StateStore* rules_store() = 0;
87
88  // Returns the IO-thread-accessible extension data.
89  virtual InfoMap* info_map() = 0;
90
91  // The LazyBackgroundTaskQueue is created at startup.
92  virtual LazyBackgroundTaskQueue* lazy_background_task_queue() = 0;
93
94  // The EventRouter is created at startup.
95  virtual EventRouter* event_router() = 0;
96
97  // The WarningService is created at startup.
98  virtual WarningService* warning_service() = 0;
99
100  // The blacklist is created at startup.
101  virtual Blacklist* blacklist() = 0;
102
103  // The ErrorConsole is created at startup.
104  virtual ErrorConsole* error_console() = 0;
105
106  // The InstallVerifier is created at startup.
107  virtual InstallVerifier* install_verifier() = 0;
108
109  // Returns the QuotaService that limits calls to certain extension functions.
110  // Lives on the UI thread. Created at startup.
111  virtual QuotaService* quota_service() = 0;
112
113  // Called by the ExtensionService that lives in this system. Gives the
114  // info map a chance to react to the load event before the EXTENSION_LOADED
115  // notification has fired. The purpose for handling this event first is to
116  // avoid race conditions by making sure URLRequestContexts learn about new
117  // extensions before anything else needs them to know.
118  virtual void RegisterExtensionWithRequestContexts(
119      const Extension* extension) {}
120
121  // Called by the ExtensionService that lives in this system. Lets the
122  // info map clean up its RequestContexts once all the listeners to the
123  // EXTENSION_UNLOADED notification have finished running.
124  virtual void UnregisterExtensionWithRequestContexts(
125      const std::string& extension_id,
126      const UnloadedExtensionInfo::Reason reason) {}
127
128  // Signaled when the extension system has completed its startup tasks.
129  virtual const OneShotEvent& ready() const = 0;
130
131  // Returns the content verifier, if any.
132  virtual ContentVerifier* content_verifier() = 0;
133
134  // Get a set of extensions that depend on the given extension.
135  // TODO(elijahtaylor): Move SharedModuleService out of chrome/browser
136  // so it can be retrieved from ExtensionSystem directly.
137  virtual scoped_ptr<ExtensionSet> GetDependentExtensions(
138      const Extension* extension) = 0;
139
140  // Get the user script master for declarative scripts, if any.
141  virtual DeclarativeUserScriptMaster*
142      GetDeclarativeUserScriptMasterByExtension(
143          const ExtensionId& extension_id) = 0;
144};
145
146}  // namespace extensions
147
148#endif  // EXTENSIONS_BROWSER_EXTENSION_SYSTEM_H_
149