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      1 // Copyright (c) 2011 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_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
      6 #define CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
      7 #pragma once
      8 
      9 #include <string>
     10 
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/timer.h"
     13 #include "chrome/browser/download/download_file.h"
     14 #include "content/browser/renderer_host/global_request_id.h"
     15 #include "content/browser/renderer_host/resource_handler.h"
     16 
     17 class DownloadFileManager;
     18 class ResourceDispatcherHost;
     19 struct DownloadBuffer;
     20 
     21 namespace net {
     22 class URLRequest;
     23 }  // namespace net
     24 
     25 // Forwards data to the download thread.
     26 class DownloadResourceHandler : public ResourceHandler {
     27  public:
     28   DownloadResourceHandler(ResourceDispatcherHost* rdh,
     29                           int render_process_host_id,
     30                           int render_view_id,
     31                           int request_id,
     32                           const GURL& url,
     33                           DownloadFileManager* download_file_manager,
     34                           net::URLRequest* request,
     35                           bool save_as,
     36                           const DownloadSaveInfo& save_info);
     37 
     38   virtual bool OnUploadProgress(int request_id, uint64 position, uint64 size);
     39 
     40   // Not needed, as this event handler ought to be the final resource.
     41   virtual bool OnRequestRedirected(int request_id, const GURL& url,
     42                                    ResourceResponse* response, bool* defer);
     43 
     44   // Send the download creation information to the download thread.
     45   virtual bool OnResponseStarted(int request_id, ResourceResponse* response);
     46 
     47   // Pass-through implementation.
     48   virtual bool OnWillStart(int request_id, const GURL& url, bool* defer);
     49 
     50   // Create a new buffer, which will be handed to the download thread for file
     51   // writing and deletion.
     52   virtual bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
     53                           int min_size);
     54 
     55   virtual bool OnReadCompleted(int request_id, int* bytes_read);
     56 
     57   virtual bool OnResponseCompleted(int request_id,
     58                                    const net::URLRequestStatus& status,
     59                                    const std::string& security_info);
     60   virtual void OnRequestClosed();
     61 
     62   // If the content-length header is not present (or contains something other
     63   // than numbers), the incoming content_length is -1 (unknown size).
     64   // Set the content length to 0 to indicate unknown size to DownloadManager.
     65   void set_content_length(const int64& content_length);
     66 
     67   void set_content_disposition(const std::string& content_disposition);
     68 
     69   void CheckWriteProgress();
     70 
     71   std::string DebugString() const;
     72 
     73  private:
     74   ~DownloadResourceHandler();
     75 
     76   void StartPauseTimer();
     77 
     78   int download_id_;
     79   GlobalRequestID global_id_;
     80   int render_view_id_;
     81   scoped_refptr<net::IOBuffer> read_buffer_;
     82   std::string content_disposition_;
     83   int64 content_length_;
     84   DownloadFileManager* download_file_manager_;
     85   net::URLRequest* request_;
     86   bool save_as_;  // Request was initiated via "Save As" by the user.
     87   DownloadSaveInfo save_info_;
     88   scoped_ptr<DownloadBuffer> buffer_;
     89   ResourceDispatcherHost* rdh_;
     90   bool is_paused_;
     91   base::OneShotTimer<DownloadResourceHandler> pause_timer_;
     92   base::TimeTicks download_start_time_;  // used to collect stats.
     93   static const int kReadBufSize = 32768;  // bytes
     94   static const size_t kLoadsToWrite = 100;  // number of data buffers queued
     95   static const int kThrottleTimeMs = 200;  // milliseconds
     96 
     97   DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
     98 };
     99 
    100 #endif  // CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
    101