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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// A proxy for NPObject that sends all calls to the object to an NPObjectStub
// running in a different process.
#ifndef CHROME_PLUGIN_NPOBJECT_PROXY_H_
#define CHROME_PLUGIN_NPOBJECT_PROXY_H_
#include "base/ref_counted.h"
#include "googleurl/src/gurl.h"
#include "ipc/ipc_channel.h"
#include "third_party/npapi/bindings/npruntime.h"
class PluginChannelBase;
struct NPObject;
namespace base {
class WaitableEvent;
}
// When running a plugin in a different process from the renderer, we need to
// proxy calls to NPObjects across process boundaries. This happens both ways,
// as a plugin can get an NPObject for the window, and a page can get an
// NPObject for the plugin. In the process that interacts with the NPobject we
// give it an NPObjectProxy instead. All calls to it are sent across an IPC
// channel (specifically, a PluginChannelBase). The NPObjectStub on the other
// side translates the IPC messages into calls to the actual NPObject, and
// returns the marshalled result.
class NPObjectProxy : public IPC::Channel::Listener,
public IPC::Message::Sender {
public:
~NPObjectProxy();
// modal_dialog_event_ is must be valid for the lifetime of the NPObjectProxy.
static NPObject* Create(PluginChannelBase* channel,
int route_id,
intptr_t npobject_ptr,
base::WaitableEvent* modal_dialog_event,
const GURL& page_url);
// IPC::Message::Sender implementation:
bool Send(IPC::Message* msg);
int route_id() { return route_id_; }
PluginChannelBase* channel() { return channel_; }
// Returns the real NPObject's pointer (obviously only valid in the other
// process).
intptr_t npobject_ptr() { return npobject_ptr_; }
// The next 9 functions are called on NPObjects from the plugin and browser.
static bool NPHasMethod(NPObject *obj,
NPIdentifier name);
static bool NPInvoke(NPObject *obj,
NPIdentifier name,
const NPVariant *args,
uint32_t arg_count,
NPVariant *result);
static bool NPInvokeDefault(NPObject *npobj,
const NPVariant *args,
uint32_t arg_count,
NPVariant *result);
static bool NPHasProperty(NPObject *obj,
NPIdentifier name);
static bool NPGetProperty(NPObject *obj,
NPIdentifier name,
NPVariant *result);
static bool NPSetProperty(NPObject *obj,
NPIdentifier name,
const NPVariant *value);
static bool NPRemoveProperty(NPObject *obj,
NPIdentifier name);
static bool NPNEnumerate(NPObject *obj,
NPIdentifier **value,
uint32_t *count);
static bool NPNConstruct(NPObject *npobj,
const NPVariant *args,
uint32_t arg_count,
NPVariant *result);
// The next two functions are only called on NPObjects from the browser.
static bool NPNEvaluate(NPP npp,
NPObject *obj,
NPString *script,
NPVariant *result);
static void NPNSetException(NPObject *obj,
const NPUTF8 *message);
static bool NPInvokePrivate(NPP npp,
NPObject *obj,
bool is_default,
NPIdentifier name,
const NPVariant *args,
uint32_t arg_count,
NPVariant *result);
static NPObjectProxy* GetProxy(NPObject* object);
static const NPClass* npclass() { return &npclass_proxy_; }
private:
NPObjectProxy(PluginChannelBase* channel,
int route_id,
intptr_t npobject_ptr,
base::WaitableEvent* modal_dialog_event,
const GURL& page_url);
// IPC::Channel::Listener implementation:
void OnMessageReceived(const IPC::Message& msg);
void OnChannelError();
static NPObject* NPAllocate(NPP, NPClass*);
static void NPDeallocate(NPObject* npObj);
// This function is only caled on NPObjects from the plugin.
static void NPPInvalidate(NPObject *obj);
static NPClass npclass_proxy_;
scoped_refptr<PluginChannelBase> channel_;
int route_id_;
intptr_t npobject_ptr_;
base::WaitableEvent* modal_dialog_event_;
// The url of the main frame hosting the plugin.
GURL page_url_;
};
#endif // CHROME_PLUGIN_NPOBJECT_PROXY_H_
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