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
17class DownloadFileManager;
18class ResourceDispatcherHost;
19struct DownloadBuffer;
20
21namespace net {
22class URLRequest;
23}  // namespace net
24
25// Forwards data to the download thread.
26class 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