1// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_MESSAGE_HANDLER_H_
6#define CHROME_BROWSER_EXTENSIONS_MESSAGE_HANDLER_H_
7
8#include <string>
9
10#include "content/public/browser/render_view_host_observer.h"
11
12namespace extensions {
13
14// Filters and dispatches extension-related IPC messages that arrive from
15// renderers. There is one of these objects for each RenderViewHost in Chrome.
16// Contrast this with extensions::TabHelper, which is only created for
17// WebContents.
18//
19// TODO(aa): Handling of content script messaging should be able to move to EFD
20// once there is an EFD for every RVHD where extension code can run. Then we
21// could eliminate this class. Right now, we don't end up with an EFD for tab
22// contents unless that tab contents is hosting chrome-extension:// URLs. That
23// still leaves content scripts. See also: crbug.com/80307.
24class MessageHandler : public content::RenderViewHostObserver {
25 public:
26  // |sender| is guaranteed to outlive this object.
27  explicit MessageHandler(content::RenderViewHost* render_view_host);
28  virtual ~MessageHandler();
29
30  // RenderViewHostObserver overrides.
31  virtual void RenderViewHostInitialized() OVERRIDE;
32  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
33
34 private:
35  // Message handlers.
36  void OnPostMessage(int port_id, const std::string& message);
37
38  DISALLOW_COPY_AND_ASSIGN(MessageHandler);
39};
40
41}  // namespace extensions
42
43#endif  // CHROME_BROWSER_EXTENSIONS_MESSAGE_HANDLER_H_
44