extensions/renderer/user_script_set.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_RENDERER_USER_SCRIPT_SET_H_
   6 #define EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/macros.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/scoped_vector.h"
  15 #include "base/memory/shared_memory.h"
  16 #include "base/observer_list.h"
  17 #include "content/public/renderer/render_process_observer.h"
  18 #include "extensions/common/user_script.h"
  19
  20 class GURL;
  21
  22 namespace blink {
  23 class WebFrame;
  24 }
  25
  26 namespace extensions {
  27 class ExtensionSet;
  28 class ScriptInjection;
  29
  30 // The UserScriptSet is a collection of UserScripts which knows how to update
  31 // itself from SharedMemory and create ScriptInjections for UserScripts to
  32 // inject on a page.
  33 class UserScriptSet {
  34  public:
  35   class Observer {
  36    public:
  37     virtual void OnUserScriptsUpdated(
  38         const std::set<HostID>& changed_hosts,
  39         const std::vector<UserScript*>& scripts) = 0;
  40   };
  41
  42   explicit UserScriptSet(const ExtensionSet* extensions);
  43   ~UserScriptSet();
  44
  45   // Adds or removes observers.
  46   void AddObserver(Observer* observer);
  47   void RemoveObserver(Observer* observer);
  48
  49   // Appends the ids of the extensions that have user scripts to |ids|.
  50   void GetActiveExtensionIds(std::set<std::string>* ids) const;
  51
  52   // Append any ScriptInjections that should run on the given |web_frame| and
  53   // |tab_id|, at the given |run_location|, to |injections|.
  54   // |extensions| is passed in to verify the corresponding extension is still
  55   // valid.
  56   void GetInjections(ScopedVector<ScriptInjection>* injections,
  57                      blink::WebFrame* web_frame,
  58                      int tab_id,
  59                      UserScript::RunLocation run_location);
  60
  61   scoped_ptr<ScriptInjection> GetDeclarativeScriptInjection(
  62       int script_id,
  63       blink::WebFrame* web_frame,
  64       int tab_id,
  65       UserScript::RunLocation run_location,
  66       const GURL& document_url);
  67
  68   // Updates scripts given the shared memory region containing user scripts.
  69   // Returns true if the scripts were successfully updated.
  70   bool UpdateUserScripts(base::SharedMemoryHandle shared_memory,
  71                          const std::set<HostID>& changed_hosts);
  72
  73   const std::vector<UserScript*>& scripts() const { return scripts_.get(); }
  74
  75  private:
  76   // Returns a new ScriptInjection for the given |script| to execute in the
  77   // |web_frame|, or NULL if the script should not execute.
  78   scoped_ptr<ScriptInjection> GetInjectionForScript(
  79       UserScript* script,
  80       blink::WebFrame* web_frame,
  81       int tab_id,
  82       UserScript::RunLocation run_location,
  83       const GURL& document_url,
  84       bool is_declarative);
  85
  86   // Shared memory containing raw script data.
  87   scoped_ptr<base::SharedMemory> shared_memory_;
  88
  89   // The set of all known extensions. Owned by the Dispatcher.
  90   const ExtensionSet* extensions_;
  91
  92   // The UserScripts this injector manages.
  93   ScopedVector<UserScript> scripts_;
  94
  95   // The associated observers.
  96   ObserverList<Observer> observers_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(UserScriptSet);
  99 };
 100
 101 }  // namespace extensions
 102
 103 #endif  // EXTENSIONS_RENDERER_USER_SCRIPT_SET_H_