extensions/browser/extension_registry.h

   1 // Copyright 2013 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_REGISTRY_H_
   6 #define EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/observer_list.h"
  13 #include "components/keyed_service/core/keyed_service.h"
  14 #include "extensions/browser/uninstall_reason.h"
  15 #include "extensions/common/extension_set.h"
  16
  17 #if !defined(ENABLE_EXTENSIONS)
  18 #error "Extensions must be enabled"
  19 #endif
  20
  21 namespace content {
  22 class BrowserContext;
  23 }
  24
  25 namespace extensions {
  26 class Extension;
  27 class ExtensionRegistryObserver;
  28
  29 // ExtensionRegistry holds sets of the installed extensions for a given
  30 // BrowserContext. An incognito browser context and its master browser context
  31 // share a single registry.
  32 class ExtensionRegistry : public KeyedService {
  33  public:
  34   // Flags to pass to GetExtensionById() to select which sets to look in.
  35   enum IncludeFlag {
  36     NONE = 0,
  37     ENABLED = 1 << 0,
  38     DISABLED = 1 << 1,
  39     TERMINATED = 1 << 2,
  40     BLACKLISTED = 1 << 3,
  41     BLOCKED = 1 << 4,
  42     EVERYTHING = (1 << 5) - 1,
  43   };
  44
  45   explicit ExtensionRegistry(content::BrowserContext* browser_context);
  46   ~ExtensionRegistry() override;
  47
  48   // Returns the instance for the given |browser_context|.
  49   static ExtensionRegistry* Get(content::BrowserContext* browser_context);
  50
  51   content::BrowserContext* browser_context() const { return browser_context_; }
  52
  53   // NOTE: These sets are *eventually* mutually exclusive, but an extension can
  54   // appear in two sets for short periods of time.
  55   const ExtensionSet& enabled_extensions() const {
  56     return enabled_extensions_;
  57   }
  58   const ExtensionSet& disabled_extensions() const {
  59     return disabled_extensions_;
  60   }
  61   const ExtensionSet& terminated_extensions() const {
  62     return terminated_extensions_;
  63   }
  64   const ExtensionSet& blacklisted_extensions() const {
  65     return blacklisted_extensions_;
  66   }
  67   const ExtensionSet& blocked_extensions() const { return blocked_extensions_; }
  68
  69   // Returns the set of all installed extensions, regardless of state (enabled,
  70   // disabled, etc). Equivalent to GenerateInstalledExtensionSet(EVERYTHING).
  71   scoped_ptr<ExtensionSet> GenerateInstalledExtensionsSet() const;
  72
  73   // Returns a set of all extensions in the subsets specified by |include_mask|.
  74   //  * enabled_extensions()     --> ExtensionRegistry::ENABLED
  75   //  * disabled_extensions()    --> ExtensionRegistry::DISABLED
  76   //  * terminated_extensions()  --> ExtensionRegistry::TERMINATED
  77   //  * blacklisted_extensions() --> ExtensionRegistry::BLACKLISTED
  78   //  * blocked_extensions()     --> ExtensionRegistry::BLOCKED
  79   scoped_ptr<ExtensionSet> GenerateInstalledExtensionsSet(
  80       int include_mask) const;
  81
  82   // The usual observer interface.
  83   void AddObserver(ExtensionRegistryObserver* observer);
  84   void RemoveObserver(ExtensionRegistryObserver* observer);
  85
  86   // Invokes the observer method OnExtensionLoaded(). The extension must be
  87   // enabled at the time of the call.
  88   void TriggerOnLoaded(const Extension* extension);
  89
  90   // Invokes the observer method OnExtensionUnloaded(). The extension must not
  91   // be enabled at the time of the call.
  92   void TriggerOnUnloaded(const Extension* extension,
  93                          UnloadedExtensionInfo::Reason reason);
  94
  95   // If this is a fresh install then |is_update| is false and there must not be
  96   // any installed extension with |extension|'s ID. If this is an update then
  97   // |is_update| is true and must be an installed extension with |extension|'s
  98   // ID, and |old_name| must be non-empty.
  99   // If true, |from_ephemeral| indicates that the extension was previously
 100   // installed ephemerally and has been promoted to a regular installed
 101   // extension. |is_update| should also be true.
 102   void TriggerOnWillBeInstalled(const Extension* extension,
 103                                 bool is_update,
 104                                 bool from_ephemeral,
 105                                 const std::string& old_name);
 106
 107   // Invokes the observer method OnExtensionInstalled(). The extension must be
 108   // contained in one of the registry's extension sets.
 109   void TriggerOnInstalled(const Extension* extension,
 110                           bool is_update);
 111
 112   // Invokes the observer method OnExtensionUninstalled(). The extension must
 113   // not be any installed extension with |extension|'s ID.
 114   void TriggerOnUninstalled(const Extension* extension, UninstallReason reason);
 115
 116   // Find an extension by ID using |include_mask| to pick the sets to search:
 117   //  * enabled_extensions()     --> ExtensionRegistry::ENABLED
 118   //  * disabled_extensions()    --> ExtensionRegistry::DISABLED
 119   //  * terminated_extensions()  --> ExtensionRegistry::TERMINATED
 120   //  * blacklisted_extensions() --> ExtensionRegistry::BLACKLISTED
 121   //  * blocked_extensions()     --> ExtensionRegistry::BLOCKED
 122   // Returns NULL if the extension is not found in the selected sets.
 123   const Extension* GetExtensionById(const std::string& id,
 124                                     int include_mask) const;
 125
 126   // Adds the specified extension to the enabled set. The registry becomes an
 127   // owner. Any previous extension with the same ID is removed.
 128   // Returns true if there is no previous extension.
 129   // NOTE: You probably want to use ExtensionService instead of calling this
 130   // method directly.
 131   bool AddEnabled(const scoped_refptr<const Extension>& extension);
 132
 133   // Removes the specified extension from the enabled set.
 134   // Returns true if the set contained the specified extension.
 135   // NOTE: You probably want to use ExtensionService instead of calling this
 136   // method directly.
 137   bool RemoveEnabled(const std::string& id);
 138
 139   // As above, but for the disabled set.
 140   bool AddDisabled(const scoped_refptr<const Extension>& extension);
 141   bool RemoveDisabled(const std::string& id);
 142
 143   // As above, but for the terminated set.
 144   bool AddTerminated(const scoped_refptr<const Extension>& extension);
 145   bool RemoveTerminated(const std::string& id);
 146
 147   // As above, but for the blacklisted set.
 148   bool AddBlacklisted(const scoped_refptr<const Extension>& extension);
 149   bool RemoveBlacklisted(const std::string& id);
 150
 151   // As above, but for the blocked set.
 152   bool AddBlocked(const scoped_refptr<const Extension>& extension);
 153   bool RemoveBlocked(const std::string& id);
 154
 155   // Removes all extensions from all sets.
 156   void ClearAll();
 157
 158   // Sets a callback to run when the disabled extension set is modified.
 159   // TODO(jamescook): This is too specific for a generic registry; find some
 160   // other way to do this.
 161   void SetDisabledModificationCallback(
 162       const ExtensionSet::ModificationCallback& callback);
 163
 164   // KeyedService implementation:
 165   void Shutdown() override;
 166
 167  private:
 168   // Extensions that are installed, enabled and not terminated.
 169   ExtensionSet enabled_extensions_;
 170
 171   // Extensions that are installed and disabled.
 172   ExtensionSet disabled_extensions_;
 173
 174   // Extensions that are installed and terminated.
 175   ExtensionSet terminated_extensions_;
 176
 177   // Extensions that are installed and blacklisted. Generally these shouldn't be
 178   // considered as installed by the extension platform: we only keep them around
 179   // so that if extensions are blacklisted by mistake they can easily be
 180   // un-blacklisted.
 181   ExtensionSet blacklisted_extensions_;
 182
 183   // Extensions that are installed and blocked. Will never be loaded.
 184   ExtensionSet blocked_extensions_;
 185
 186   ObserverList<ExtensionRegistryObserver> observers_;
 187
 188   content::BrowserContext* const browser_context_;
 189
 190   DISALLOW_COPY_AND_ASSIGN(ExtensionRegistry);
 191 };
 192
 193 }  // namespace extensions
 194
 195 #endif  // EXTENSIONS_BROWSER_EXTENSION_REGISTRY_H_