extensions/browser/declarative_user_script_manager.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_DECLARATIVE_USER_SCRIPT_MANAGER_H_
   6 #define EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_
   7
   8 #include <map>
   9
  10 #include "base/macros.h"
  11 #include "base/memory/linked_ptr.h"
  12 #include "base/scoped_observer.h"
  13 #include "components/keyed_service/core/keyed_service.h"
  14 #include "extensions/browser/extension_registry_observer.h"
  15 #include "extensions/common/host_id.h"
  16
  17 namespace content {
  18 class BrowserContext;
  19 }
  20
  21 namespace extensions {
  22 class DeclarativeUserScriptMaster;
  23
  24 // Manages a set of DeclarativeUserScriptMaster objects for script injections.
  25 class DeclarativeUserScriptManager : public KeyedService,
  26                                      public ExtensionRegistryObserver {
  27  public:
  28   explicit DeclarativeUserScriptManager(
  29       content::BrowserContext* browser_context);
  30   ~DeclarativeUserScriptManager() override;
  31
  32   // Convenience method to return the DeclarativeUserScriptManager for a given
  33   // |context|.
  34   static DeclarativeUserScriptManager* Get(content::BrowserContext* context);
  35
  36   // Gets the user script master for declarative scripts by the given
  37   // HostID; if one does not exist, a new object will be created.
  38   DeclarativeUserScriptMaster* GetDeclarativeUserScriptMasterByID(
  39       const HostID& host_id);
  40
  41  private:
  42   using UserScriptMasterMap =
  43       std::map<HostID, linked_ptr<DeclarativeUserScriptMaster>>;
  44
  45   // ExtensionRegistryObserver:
  46   void OnExtensionUnloaded(content::BrowserContext* browser_context,
  47                            const Extension* extension,
  48                            UnloadedExtensionInfo::Reason reason) override;
  49
  50   // Creates a DeclarativeUserScriptMaster object.
  51   DeclarativeUserScriptMaster* CreateDeclarativeUserScriptMaster(
  52       const HostID& host_id);
  53
  54   // A map of DeclarativeUserScriptMasters for each host; each master
  55   // is lazily initialized.
  56   UserScriptMasterMap declarative_user_script_masters_;
  57
  58   content::BrowserContext* browser_context_;
  59
  60   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
  61       extension_registry_observer_;
  62
  63   DISALLOW_COPY_AND_ASSIGN(DeclarativeUserScriptManager);
  64 };
  65
  66 }  // namespace extensions
  67
  68 #endif  // EXTENSIONS_BROWSER_DECLARATIVE_USER_SCRIPT_MANAGER_H_