chrome/renderer/extensions/extension_localization_peer.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 #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
  13 namespace IPC {
  14 class 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.
  24 class ExtensionLocalizationPeer : public content::RequestPeer {
  25  public:
  26   ~ExtensionLocalizationPeer() override;
  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   void OnUploadProgress(uint64 position, uint64 size) override;
  36   bool OnReceivedRedirect(const net::RedirectInfo& redirect_info,
  37                           const content::ResourceResponseInfo& info) override;
  38   void OnReceivedResponse(const content::ResourceResponseInfo& info) override;
  39   void OnDownloadedData(int len, int encoded_data_length) override {}
  40   void OnReceivedData(const char* data,
  41                       int data_length,
  42                       int encoded_data_length) override;
  43   void OnCompletedRequest(int error_code,
  44                           bool was_ignored_by_handler,
  45                           bool stale_copy_in_cache,
  46                           const std::string& security_info,
  47                           const base::TimeTicks& completion_time,
  48                           int64 total_transfer_size) override;
  49
  50  private:
  51   friend class ExtensionLocalizationPeerTest;
  52
  53   // Use CreateExtensionLocalizationPeer to create an instance.
  54   ExtensionLocalizationPeer(content::RequestPeer* peer,
  55                             IPC::Sender* message_sender,
  56                             const GURL& request_url);
  57
  58   // Loads message catalogs, and replaces all __MSG_some_name__ templates within
  59   // loaded file.
  60   void ReplaceMessages();
  61
  62   // Original peer that handles the request once we are done processing data_.
  63   content::RequestPeer* original_peer_;
  64
  65   // We just pass though the response info. This holds the copy of the original.
  66   content::ResourceResponseInfo response_info_;
  67
  68   // Sends ExtensionHostMsg_GetMessageBundle message to the browser to fetch
  69   // message catalog.
  70   IPC::Sender* message_sender_;
  71
  72   // Buffer for incoming data. We wait until OnCompletedRequest before using it.
  73   std::string data_;
  74
  75   // Original request URL.
  76   GURL request_url_;
  77
  78  private:
  79   DISALLOW_COPY_AND_ASSIGN(ExtensionLocalizationPeer);
  80 };
  81
  82 #endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_LOCALIZATION_PEER_H_