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 CHROME_RENDERER_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_
6#define CHROME_RENDERER_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_
7
8#include <string>
9
10#include "content/public/child/request_peer.h"
11#include "content/public/common/resource_response_info.h"
12
13namespace IPC {
14class Sender;
15}
16
17// The ExtensionLocalizationPeer is a proxy to a
18// content::RequestPeer instance.  It is used to pre-process
19// CSS files requested by extensions to replace localization templates with the
20// appropriate localized strings.
21//
22// Call the factory method CreateExtensionLocalizationPeer() to obtain an
23// instance of ExtensionLocalizationPeer based on the original Peer.
24class ExtensionLocalizationPeer : public content::RequestPeer {
25 public:
26  virtual ~ExtensionLocalizationPeer();
27
28  static ExtensionLocalizationPeer* CreateExtensionLocalizationPeer(
29      content::RequestPeer* peer,
30      IPC::Sender* message_sender,
31      const std::string& mime_type,
32      const GURL& request_url);
33
34  // content::RequestPeer methods.
35  virtual void OnUploadProgress(uint64 position, uint64 size) OVERRIDE;
36  virtual bool OnReceivedRedirect(
37      const net::RedirectInfo& redirect_info,
38      const content::ResourceResponseInfo& info) OVERRIDE;
39  virtual void OnReceivedResponse(
40      const content::ResourceResponseInfo& info) OVERRIDE;
41  virtual void OnDownloadedData(int len, int encoded_data_length) OVERRIDE {}
42  virtual void OnReceivedData(const char* data,
43                              int data_length,
44                              int encoded_data_length) OVERRIDE;
45  virtual void OnCompletedRequest(int error_code,
46                                  bool was_ignored_by_handler,
47                                  bool stale_copy_in_cache,
48                                  const std::string& security_info,
49                                  const base::TimeTicks& completion_time,
50                                  int64 total_transfer_size) OVERRIDE;
51
52 private:
53  friend class ExtensionLocalizationPeerTest;
54
55  // Use CreateExtensionLocalizationPeer to create an instance.
56  ExtensionLocalizationPeer(content::RequestPeer* peer,
57                            IPC::Sender* message_sender,
58                            const GURL& request_url);
59
60  // Loads message catalogs, and replaces all __MSG_some_name__ templates within
61  // loaded file.
62  void ReplaceMessages();
63
64  // Original peer that handles the request once we are done processing data_.
65  content::RequestPeer* original_peer_;
66
67  // We just pass though the response info. This holds the copy of the original.
68  content::ResourceResponseInfo response_info_;
69
70  // Sends ExtensionHostMsg_GetMessageBundle message to the browser to fetch
71  // message catalog.
72  IPC::Sender* message_sender_;
73
74  // Buffer for incoming data. We wait until OnCompletedRequest before using it.
75  std::string data_;
76
77  // Original request URL.
78  GURL request_url_;
79
80 private:
81  DISALLOW_COPY_AND_ASSIGN(ExtensionLocalizationPeer);
82};
83
84#endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_
85