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      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   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