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