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