class/Mono.Http/Mono.Http/GZipWebRequest.cs

   1 //
   2 // Mono.Http.GzipWebRequest
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (c) 2003 Ximian, Inc. (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Net;
  33 using System.Collections;
  34 using System.IO;
  35 using System.Runtime.Serialization;
  36 using ICSharpCode.SharpZipLib.GZip;
  37
  38 namespace Mono.Http
  39 {
  40         [Serializable]
  41         public class GZipWebRequest : WebRequest, ISerializable
  42         {
  43                 WebRequest request;
  44                 bool enabled;
  45
  46                 public GZipWebRequest (WebRequest request)
  47                 {
  48                         if (request == null)
  49                                 throw new ArgumentNullException ("request");
  50
  51                         this.request = request;
  52                         enabled = true;
  53                 }
  54
  55                 protected GZipWebRequest (SerializationInfo serializationInfo, StreamingContext streamingContext)
  56                 {
  57                         SerializationInfo info = serializationInfo;
  58                         request = (WebRequest) info.GetValue ("request", typeof (WebRequest));
  59                         enabled = info.GetBoolean ("enabled");
  60                 }
  61
  62                 public override string ConnectionGroupName {
  63                         get { return request.ConnectionGroupName; }
  64                         set { request.ConnectionGroupName = value; }
  65                 }
  66
  67                 public override long ContentLength {
  68                         get { return request.ContentLength; }
  69                         set { request.ContentLength = value; }
  70                 }
  71
  72                 public override string ContentType {
  73                         get { return request.ContentType; }
  74                         set { request.ContentType = value; }
  75                 }
  76
  77                 public override ICredentials Credentials {
  78                         get { return request.Credentials; }
  79                         set { request.Credentials = value; }
  80                 }
  81
  82                 public override WebHeaderCollection Headers {
  83                         get { return request.Headers; }
  84                         set { request.Headers = value; }
  85                 }
  86
  87                 public override string Method {
  88                         get { return request.Method; }
  89                         set { request.Method = value; }
  90                 }
  91
  92                 public override bool PreAuthenticate {
  93                         get { return request.PreAuthenticate; }
  94                         set { request.PreAuthenticate = value; }
  95                 }
  96
  97                 public override IWebProxy Proxy {
  98                         get { return request.Proxy; }
  99                         set { request.Proxy = value; }
 100                 }
 101
 102                 public override Uri RequestUri {
 103                         get { return request.RequestUri; }
 104                 }
 105
 106                 public override int Timeout {
 107                         get { return request.Timeout; }
 108                         set { request.Timeout = value; }
 109                 }
 110
 111                 public WebRequest RealRequest {
 112                         get { return request; }
 113                 }
 114
 115                 public bool EnableCompression {
 116                         get { return enabled; }
 117                         set { enabled = value; }
 118                 }
 119
 120                 void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
 121                 {
 122                         info.AddValue ("request", request, typeof (WebRequest));
 123                         info.AddValue ("enabled", enabled);
 124                 }
 125
 126                 public override void Abort ()
 127                 {
 128                         request.Abort ();
 129                 }
 130
 131                 public override IAsyncResult BeginGetRequestStream (AsyncCallback callback, object state)
 132                 {
 133                         CheckHeader ();
 134                         return request.BeginGetRequestStream (callback, state);
 135                 }
 136
 137                 public override Stream EndGetRequestStream (IAsyncResult asyncResult)
 138                 {
 139                         return request.EndGetRequestStream (asyncResult);
 140                 }
 141
 142                 public override Stream GetRequestStream ()
 143                 {
 144                         CheckHeader ();
 145                         return request.GetRequestStream ();
 146                 }
 147
 148                 void CheckHeader ()
 149                 {
 150                         if (!enabled)
 151                                 return;
 152
 153                         string accept = request.Headers ["Accept-Encoding"];
 154                         if (accept == null || accept == "")
 155                                 request.Headers ["Accept-Encoding"] = "gzip; q=1.0, identity";
 156                 }
 157
 158                 public override IAsyncResult BeginGetResponse (AsyncCallback callback, object state)
 159                 {
 160                         CheckHeader ();
 161                         return request.BeginGetResponse (callback, state);
 162                 }
 163
 164                 public override WebResponse EndGetResponse (IAsyncResult asyncResult)
 165                 {
 166                         WebResponse response = request.EndGetResponse (asyncResult);
 167                         bool compressed = (String.Compare (response.Headers ["Content-Encoding"], "gzip", true) == 0);
 168                         if (!compressed)
 169                                 return response;
 170
 171                         return new GZipWebResponse (response, compressed);
 172                 }
 173
 174                 public override WebResponse GetResponse ()
 175                 {
 176                         IAsyncResult result = BeginGetResponse (null, null);
 177                         return EndGetResponse (result);
 178                 }
 179         }
 180 }
 181