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1 /*
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2 * File: HttpReader.cs
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3 * Created: 01/17/2003
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4 * Author: Igor Tkachev
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5 * mailto:it@rsdn.ru
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6 */
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7
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8 using System;
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9 using System.Collections;
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10 using System.IO;
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11 using System.Net;
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12 using System.Text;
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13 using System.Security.Cryptography.X509Certificates;
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14 using System.Collections.Generic;
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15
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16 namespace BLToolkit.Net
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17 {
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18 public delegate void ProcessStream(Stream stream);
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19
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20 /// <summary>
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21 /// Encapsulates WebReader functions.
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22 /// </summary>
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23 public class HttpReader
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24 {
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25 #region Costructors
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26
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27 public HttpReader()
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28 {
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29 BaseUri = string.Empty;
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30 }
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31
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32 public HttpReader(string baseUri)
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33 {
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34 BaseUri = baseUri;
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35 }
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36
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37 #endregion
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38
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39 #region Public Properties
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40
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41 private X509Certificate _certificate;
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42 public X509Certificate Certificate
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43 {
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44 get { return _certificate; }
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45 set { _certificate = value; }
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46 }
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47
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48 private string _baseUri;
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49 public string BaseUri
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50 {
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51 get { return _baseUri; }
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52 set { _baseUri = value; }
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53 }
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54
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55 private string _previousUri;
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56 public string PreviousUri
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57 {
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58 get { return _previousUri; }
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59 set { _previousUri = value; }
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60 }
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61
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62 private CookieContainer _cookieContainer = new CookieContainer();
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63 public CookieContainer CookieContainer
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64 {
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65 get { return _cookieContainer; }
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66 set { _cookieContainer = value; }
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67 }
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68
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69 private string _userAgent = @"HttpReader";
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70 public string UserAgent
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71 {
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72 get { return _userAgent; }
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73 set { _userAgent = value; }
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74 }
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75
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76 private string _accept =
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77 @"image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*";
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78 public string Accept
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79 {
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80 get { return _accept; }
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81 set { _accept = value; }
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82 }
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83
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84 private Uri _requestUri;
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85 public Uri RequestUri
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86 {
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87 get { return _requestUri; }
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88 set { _requestUri = value; }
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89 }
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90
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91 private string _contentType = string.Empty;
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92 public string ContentType
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93 {
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94 get { return _contentType; }
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95 set { _contentType = value; }
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96 }
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97
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98 private IWebProxy _proxy = new WebProxy();
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99 public IWebProxy Proxy
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100 {
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101 get { return _proxy; }
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102 set { _proxy = value; }
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103 }
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104
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105 private ICredentials _credentials = CredentialCache.DefaultCredentials;
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106 public ICredentials Credentials
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107 {
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108 get { return _credentials; }
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109 set { _credentials = value; }
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110 }
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111
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112 private string _html;
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113 public string Html
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114 {
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115 get { return _html; }
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116 }
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117
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118 private readonly Hashtable _headers = new Hashtable();
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119 public Hashtable Headers
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120 {
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121 get { return _headers; }
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122 }
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123
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124 private string _location;
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125 public string Location
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126 {
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127 get { return _location; }
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128 }
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129
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130 private bool _sendReferer = true;
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131 public bool SendReferer
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132 {
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133 get { return _sendReferer; }
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134 set { _sendReferer = value; }
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135 }
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136
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137 private HttpStatusCode _statusCode;
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138 public HttpStatusCode StatusCode
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139 {
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140 get { return _statusCode; }
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141 }
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142
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143 private int _timeout;
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144 public int Timeout
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145 {
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146 get { return _timeout; }
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147 set { _timeout = value; }
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148 }
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149
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150 #endregion
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151
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152 #region Public Methods
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153
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154 public void LoadCertificate(string fileName)
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155 {
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156 Certificate = X509Certificate.CreateFromCertFile(fileName);
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157 }
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158
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159 #endregion
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160
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161 #region Request Methods
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162
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163 private HttpWebRequest PrepareRequest(string method, string requestUri, ProcessStream requestStreamProcessor)
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164 {
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165 _html = "";
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166
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167 string uri = BaseUri;
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168
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169 if (method != "SOAP")
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170 uri += requestUri;
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171
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172 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
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173
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174 if (Proxy != null) request.Proxy = Proxy;
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175 if (Credentials != null) request.Credentials = Credentials;
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176
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177 request.CookieContainer = CookieContainer;
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178 request.UserAgent = UserAgent;
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179 request.Accept = Accept;
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180 request.Method = method == "SOAP"? "POST" : method;
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181 request.KeepAlive = true;
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182
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183 if (SendReferer)
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184 request.Referer = PreviousUri ?? uri;
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185
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186 foreach (string key in Headers.Keys)
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187 request.Headers.Add(key, Headers[key].ToString());
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188
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189 if (method == "POST")
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190 {
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191 request.ContentType = "application/x-www-form-urlencoded";
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192 request.AllowAutoRedirect = false;
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193 }
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194 else if (method == "SOAP")
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195 {
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196 request.ContentType = "text/xml; charset=utf-8";
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197 request.AllowAutoRedirect = false;
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198
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199 request.Headers.Add("SOAPAction", requestUri);
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200 }
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201 else
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202 {
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203 request.ContentType = ContentType;
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204 request.AllowAutoRedirect = true;
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205 }
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206
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207 PreviousUri = uri;
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208 RequestUri = request.RequestUri;
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209
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210 if (Certificate != null)
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211 request.ClientCertificates.Add(Certificate);
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212
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213 if (Timeout != 0)
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214 request.Timeout = Timeout;
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215
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216 if (requestStreamProcessor != null)
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217 using (Stream st = request.GetRequestStream())
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218 requestStreamProcessor(st);
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219
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220 return request;
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221 }
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222
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223 public HttpStatusCode Request(
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224 string requestUri,
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225 string method,
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226 ProcessStream requestStreamProcessor,
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227 ProcessStream responseStreamProcessor)
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228 {
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229 HttpWebRequest request = PrepareRequest(method, requestUri, requestStreamProcessor);
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230
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231 using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse())
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232 using (Stream sm = resp.GetResponseStream())
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233 {
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234 _statusCode = resp.StatusCode;
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235 _location = resp.Headers["Location"];
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236
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237 if (resp.ResponseUri.AbsoluteUri.StartsWith(BaseUri) == false)
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238 BaseUri = resp.ResponseUri.Scheme + "://" + resp.ResponseUri.Host;
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239
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240 CookieCollection cc = request.CookieContainer.GetCookies(request.RequestUri);
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241
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242 // This code fixes the situation when a server sets a cookie without the 'path'.
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243 // IE takes this as the root ('/') value,
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244 // the HttpWebRequest class as the RequestUri.AbsolutePath value.
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245 //
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246 foreach (Cookie c in cc)
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247 if (c.Path == request.RequestUri.AbsolutePath)
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248 CookieContainer.Add(new Cookie(c.Name, c.Value, "/", c.Domain));
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249
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250 if (responseStreamProcessor != null)
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251 responseStreamProcessor(sm);
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252 }
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253
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254 return StatusCode;
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255 }
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256
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257 public IEnumerable<string> Request(
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258 string requestUri,
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259 string method,
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260 ProcessStream requestStreamProcessor)
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261 {
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262 HttpWebRequest request = PrepareRequest(method, requestUri, requestStreamProcessor);
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263
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264 using (HttpWebResponse resp = (HttpWebResponse)request.GetResponse())
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265 using (Stream sm = resp.GetResponseStream())
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266 using (StreamReader sr = new StreamReader(sm, Encoding.Default))
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267 {
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268 _statusCode = resp.StatusCode;
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269 _location = resp.Headers["Location"];
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270
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271 if (resp.ResponseUri.AbsoluteUri.StartsWith(BaseUri) == false)
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272 BaseUri = resp.ResponseUri.Scheme + "://" + resp.ResponseUri.Host;
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273
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274 CookieCollection cc = request.CookieContainer.GetCookies(request.RequestUri);
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275
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276 // This code fixes the case when a server sets a cookie without the 'path'.
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277 // IE takes this as the root ('/') value,
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278 // the HttpWebRequest class as the RequestUri.AbsolutePath value.
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279 //
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280 foreach (Cookie c in cc)
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281 if (c.Path == request.RequestUri.AbsolutePath)
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282 CookieContainer.Add(new Cookie(c.Name, c.Value, "/", c.Domain));
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283
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284 while (true)
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285 {
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286 string str = sr.ReadLine();
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287
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288 if (str == null)
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289 break;
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290
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291 yield return str;
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292 }
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293 }
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294 }
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295
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296 class DefaultRequestStreamProcessor
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297 {
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298 public DefaultRequestStreamProcessor(string data)
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299 {
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300 _data = data;
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301 }
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302
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303 readonly string _data;
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304
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305 public void Process(Stream stream)
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306 {
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307 byte[] bytes = Encoding.ASCII.GetBytes(_data);
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308 stream.Write(bytes, 0, bytes.Length);
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309 }
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310 }
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311
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312 class DefaultResponseStreamProcessor
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313 {
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314 public DefaultResponseStreamProcessor(HttpReader reader)
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315 {
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316 _reader = reader;
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317 }
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318
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319 readonly HttpReader _reader;
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320
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321 public void Process(Stream stream)
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322 {
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323 using (StreamReader sr = new StreamReader(stream, Encoding.Default))
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324 _reader._html = sr.ReadToEnd();
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325 }
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326 }
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327
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328 public HttpStatusCode Get(string requestUri)
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329 {
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330 DefaultResponseStreamProcessor rp = new DefaultResponseStreamProcessor(this);
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331
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332 return Request(requestUri, "GET", null, rp.Process);
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333 }
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334
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335 public HttpStatusCode Get(string requestUri, ProcessStream responseStreamProcessor)
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336 {
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337 return Request(requestUri, "GET", null, responseStreamProcessor);
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338 }
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339
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340 public HttpStatusCode Post(
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341 string requestUri,
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342 string postData)
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343 {
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344 return Post(
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345 requestUri,
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346 new DefaultRequestStreamProcessor(postData).Process,
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347 new DefaultResponseStreamProcessor(this).Process);
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348 }
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349
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350 public HttpStatusCode Post(
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351 string requestUri,
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352 ProcessStream requestStreamProcessor)
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353 {
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354 return Post(
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355 requestUri,
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356 requestStreamProcessor,
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357 new DefaultResponseStreamProcessor(this).Process);
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358 }
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359
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360 public HttpStatusCode Post(
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361 string requestUri,
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362 string postData,
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363 ProcessStream responseStreamProcessor)
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364 {
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365 return Post(
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366 requestUri,
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367 new ProcessStream(new DefaultRequestStreamProcessor(postData).Process),
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368 responseStreamProcessor);
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369 }
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370
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371 public HttpStatusCode Post(
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372 string requestUri,
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373 ProcessStream requestStreamProcessor,
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374 ProcessStream responseStreamProcessor)
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375 {
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376 Request(requestUri, "POST", requestStreamProcessor, responseStreamProcessor);
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377
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378 for (int i = 0; i < 10; i++)
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379 {
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380 bool post = false;
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381
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382 switch (StatusCode)
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383 {
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384 case HttpStatusCode.MultipleChoices: // 300
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385 case HttpStatusCode.MovedPermanently: // 301
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386 case HttpStatusCode.Found: // 302
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387 case HttpStatusCode.SeeOther: // 303
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388 break;
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389
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390 case HttpStatusCode.TemporaryRedirect: // 307
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391 post = true;
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392 break;
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393
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394 default:
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395 return StatusCode;
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396 }
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397
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398 if (Location == null)
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399 break;
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400
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401 Uri uri = new Uri(new Uri(PreviousUri), Location);
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402
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403 BaseUri = uri.Scheme + "://" + uri.Host;
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404 requestUri = uri.AbsolutePath + uri.Query;
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405
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406 Request(
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407 requestUri,
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408 post? "POST": "GET",
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409 post? requestStreamProcessor: null,
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410 responseStreamProcessor);
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411 }
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412
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413 return StatusCode;
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414 }
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415
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416 private HttpStatusCode Soap(
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417 string soapAction,
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418 ProcessStream inputStreamProcessor,
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419 ProcessStream outputStreamProcessor)
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420 {
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421 return Request("\"" + soapAction + "\"", "SOAP", inputStreamProcessor, outputStreamProcessor);
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422 }
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423
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424 public HttpStatusCode Soap(string soapAction, string postData)
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425 {
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426 return Soap(soapAction,
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427 new DefaultRequestStreamProcessor(postData).Process,
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428 new DefaultResponseStreamProcessor(this).Process);
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429 }
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430
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431 public HttpStatusCode Soap(string soapAction, string postData, ProcessStream outputStreamProcessor)
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432 {
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433 return Soap(
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434 soapAction,
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435 new DefaultRequestStreamProcessor(postData).Process,
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436 outputStreamProcessor);
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437 }
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438
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439 public IEnumerable<string> SoapEx(string soapAction, string postData)
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440 {
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441 return Request("\"" + soapAction + "\"", "SOAP", new DefaultRequestStreamProcessor(postData).Process);
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442 }
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443
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444 #endregion
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445
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446 #region Download
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447
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448 public void Download(string requestUri, string fileName)
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449 {
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450 string uri = BaseUri + requestUri;
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451
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452 WebClient request = new WebClient();
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453
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454 if (Proxy != null) request.Proxy = Proxy;
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455 if (Credentials != null) request.Credentials = Credentials;
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456
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457 foreach (string key in Headers.Keys)
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458 request.Headers.Add(key, Headers[key].ToString());
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459
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460 request.DownloadFile(uri, fileName);
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461 }
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462
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463 #endregion
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464 }
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465 }
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