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 GURL& new_url,
38      const GURL& new_first_party_for_cookies,
39      const content::ResourceResponseInfo& info) OVERRIDE;
40  virtual void OnReceivedResponse(
41      const content::ResourceResponseInfo& info) OVERRIDE;
42  virtual void OnDownloadedData(int len, int encoded_data_length) OVERRIDE {}
43  virtual void OnReceivedData(const char* data,
44                              int data_length,
45                              int encoded_data_length) OVERRIDE;
46  virtual void OnCompletedRequest(int error_code,
47                                  bool was_ignored_by_handler,
48                                  bool stale_copy_in_cache,
49                                  const std::string& security_info,
50                                  const base::TimeTicks& completion_time,
51                                  int64 total_transfer_size) OVERRIDE;
52
53 private:
54  friend class ExtensionLocalizationPeerTest;
55
56  // Use CreateExtensionLocalizationPeer to create an instance.
57  ExtensionLocalizationPeer(content::RequestPeer* peer,
58                            IPC::Sender* message_sender,
59                            const GURL& request_url);
60
61  // Loads message catalogs, and replaces all __MSG_some_name__ templates within
62  // loaded file.
63  void ReplaceMessages();
64
65  // Original peer that handles the request once we are done processing data_.
66  content::RequestPeer* original_peer_;
67
68  // We just pass though the response info. This holds the copy of the original.
69  content::ResourceResponseInfo response_info_;
70
71  // Sends ExtensionHostMsg_GetMessageBundle message to the browser to fetch
72  // message catalog.
73  IPC::Sender* message_sender_;
74
75  // Buffer for incoming data. We wait until OnCompletedRequest before using it.
76  std::string data_;
77
78  // Original request URL.
79  GURL request_url_;
80
81 private:
82  DISALLOW_COPY_AND_ASSIGN(ExtensionLocalizationPeer);
83};
84
85#endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_
86