extensions/browser/extension_system.h

   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
  14 class ExtensionService;
  15
  16 #if defined(OS_CHROMEOS)
  17 namespace chromeos {
  18 class DeviceLocalAccountManagementPolicyProvider;
  19 }
  20 #endif  // defined(OS_CHROMEOS)
  21
  22 namespace content {
  23 class BrowserContext;
  24 }
  25
  26 namespace extensions {
  27
  28 class Blacklist;
  29 class ContentVerifier;
  30 class DeclarativeUserScriptMaster;
  31 class ErrorConsole;
  32 class EventRouter;
  33 class Extension;
  34 class ExtensionSet;
  35 class InfoMap;
  36 class InstallVerifier;
  37 class LazyBackgroundTaskQueue;
  38 class ManagementPolicy;
  39 class OneShotEvent;
  40 class ProcessManager;
  41 class QuotaService;
  42 class RuntimeData;
  43 class SharedUserScriptMaster;
  44 class StateStore;
  45 class 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.
  51 class 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_