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