content/child/npapi/npobject_proxy.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 // A proxy for NPObject that sends all calls to the object to an NPObjectStub
   6 // running in a different process.
   7
   8 #ifndef CONTENT_CHILD_NPAPI_NPOBJECT_PROXY_H_
   9 #define CONTENT_CHILD_NPAPI_NPOBJECT_PROXY_H_
  10
  11 #include "base/memory/ref_counted.h"
  12 #include "content/child/npapi/npobject_base.h"
  13 #include "ipc/ipc_listener.h"
  14 #include "ipc/ipc_sender.h"
  15 #include "third_party/npapi/bindings/npruntime.h"
  16 #include "ui/gfx/native_widget_types.h"
  17 #include "url/gurl.h"
  18
  19 struct NPObject;
  20
  21 namespace content {
  22 class NPChannelBase;
  23
  24 // When running a plugin in a different process from the renderer, we need to
  25 // proxy calls to NPObjects across process boundaries.  This happens both ways,
  26 // as a plugin can get an NPObject for the window, and a page can get an
  27 // NPObject for the plugin.  In the process that interacts with the NPobject we
  28 // give it an NPObjectProxy instead.  All calls to it are sent across an IPC
  29 // channel (specifically, a NPChannelBase).  The NPObjectStub on the other
  30 // side translates the IPC messages into calls to the actual NPObject, and
  31 // returns the marshalled result.
  32 class NPObjectProxy : public IPC::Listener,
  33                       public IPC::Sender,
  34                       public NPObjectBase {
  35  public:
  36   ~NPObjectProxy() override;
  37
  38   static NPObject* Create(NPChannelBase* channel,
  39                           int route_id,
  40                           int render_view_id,
  41                           const GURL& page_url,
  42                           NPP owner);
  43
  44   // IPC::Sender implementation:
  45   bool Send(IPC::Message* msg) override;
  46   int route_id() { return route_id_; }
  47   NPChannelBase* channel() { return channel_.get(); }
  48
  49   // The next 9 functions are called on NPObjects from the plugin and browser.
  50   static bool NPHasMethod(NPObject *obj,
  51                           NPIdentifier name);
  52   static bool NPInvoke(NPObject *obj,
  53                        NPIdentifier name,
  54                        const NPVariant *args,
  55                        uint32_t arg_count,
  56                        NPVariant *result);
  57   static bool NPInvokeDefault(NPObject *npobj,
  58                               const NPVariant *args,
  59                               uint32_t arg_count,
  60                               NPVariant *result);
  61   static bool NPHasProperty(NPObject *obj,
  62                             NPIdentifier name);
  63   static bool NPGetProperty(NPObject *obj,
  64                             NPIdentifier name,
  65                             NPVariant *result);
  66   static bool NPSetProperty(NPObject *obj,
  67                             NPIdentifier name,
  68                             const NPVariant *value);
  69   static bool NPRemoveProperty(NPObject *obj,
  70                                NPIdentifier name);
  71   static bool NPNEnumerate(NPObject *obj,
  72                            NPIdentifier **value,
  73                            uint32_t *count);
  74   static bool NPNConstruct(NPObject *npobj,
  75                            const NPVariant *args,
  76                            uint32_t arg_count,
  77                            NPVariant *result);
  78
  79   // The next two functions are only called on NPObjects from the browser.
  80   static bool NPNEvaluate(NPP npp,
  81                           NPObject *obj,
  82                           NPString *script,
  83                           NPVariant *result);
  84
  85   static bool NPInvokePrivate(NPP npp,
  86                               NPObject *obj,
  87                               bool is_default,
  88                               NPIdentifier name,
  89                               const NPVariant *args,
  90                               uint32_t arg_count,
  91                               NPVariant *result);
  92
  93   static NPObjectProxy* GetProxy(NPObject* object);
  94   static const NPClass* npclass() { return &npclass_proxy_; }
  95
  96   // NPObjectBase implementation.
  97   NPObject* GetUnderlyingNPObject() override;
  98
  99   IPC::Listener* GetChannelListener() override;
 100
 101  private:
 102   NPObjectProxy(NPChannelBase* channel,
 103                 int route_id,
 104                 int render_view_id,
 105                 const GURL& page_url);
 106
 107   // IPC::Listener implementation:
 108   bool OnMessageReceived(const IPC::Message& msg) override;
 109   void OnChannelError() override;
 110
 111   static NPObject* NPAllocate(NPP, NPClass*);
 112   static void NPDeallocate(NPObject* npObj);
 113
 114   // This function is only caled on NPObjects from the plugin.
 115   static void NPPInvalidate(NPObject *obj);
 116   static NPClass npclass_proxy_;
 117
 118   scoped_refptr<NPChannelBase> channel_;
 119   int route_id_;
 120   int render_view_id_;
 121
 122   // The url of the main frame hosting the plugin.
 123   GURL page_url_;
 124 };
 125
 126 }  // namespace content
 127
 128 #endif  // CONTENT_CHILD_NPAPI_NPOBJECT_PROXY_H_