mcs/class/Mono.Http/Mono.Http.Configuration/AcceptEncodingConfig.cs

   1 //
   2 // AcceptEncodingConfig.cs
   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.Collections;
  33 using System.Collections.Specialized;
  34 using System.IO;
  35 using System.Web;
  36
  37 namespace Mono.Http.Configuration
  38 {
  39         public class AcceptEncodingConfig
  40         {
  41                 Hashtable tbl = CollectionsUtil.CreateCaseInsensitiveHashtable ();
  42
  43                 public AcceptEncodingConfig () : this (null)
  44                 {
  45                 }
  46
  47                 public AcceptEncodingConfig (AcceptEncodingConfig parent)
  48                 {
  49                         if (parent == null)
  50                                 return;
  51
  52                         // FIXME: copy parent's config
  53                 }
  54
  55                 public void Add (string encoding, string type)
  56                 {
  57                         tbl [encoding] = Type.GetType (type);
  58                 }
  59
  60                 public bool SetFilter (HttpResponse response, string acceptEncoding)
  61                 {
  62                         if (acceptEncoding == null)
  63                                 return false;
  64
  65                         acceptEncoding = acceptEncoding.Trim ();
  66                         if (acceptEncoding == "")
  67                                 return false;
  68
  69                         string [] parts = null;
  70                         if (acceptEncoding.IndexOf (';') != -1)
  71                                 parts = acceptEncoding.Split (';');
  72                         else
  73                                 parts = acceptEncoding.Split (',');
  74
  75                         string encoding;
  76                         float weight = 0.0f;
  77                         float current = 0.0f;
  78                         Type type = null;
  79                         string name = null;
  80                         int i = 0;
  81                         foreach (string s in parts) {
  82                                 encoding = null;
  83                                 ParseValue (s, ref encoding, ref weight);
  84                                 if (encoding != null && weight > current && tbl.Contains (encoding)) {
  85                                         type = tbl [encoding] as Type;
  86                                         current = weight;
  87                                         name = encoding;
  88                                 }
  89                                 i++;
  90                         }
  91
  92                         if (type == null)
  93                                 return false;
  94
  95                         Stream filter = response.Filter;
  96                         response.Filter = (Stream) Activator.CreateInstance (type, new object [] {filter});
  97                         response.AppendHeader ("Content-Encoding", name);
  98                         return true;
  99                 }
 100
 101                 public void Clear ()
 102                 {
 103                         tbl.Clear ();
 104                 }
 105
 106                 static void ParseValue (string s, ref string encoding, ref float weight)
 107                 {
 108                         //FIXME: make it more spec compliant
 109                         string [] parts = s.Trim ().Split (',');
 110                         if (parts.Length == 1) {
 111                                 encoding = parts [0].Trim ();
 112                                 weight = 1.0f;
 113                         } else if (parts.Length == 2) {
 114                                 encoding = parts [0].Trim ();
 115                                 try {
 116                                         int i = parts [1].IndexOf ('=');
 117                                         if (i != -1)
 118                                                 weight = Convert.ToSingle (parts [1].Substring (i + 1));
 119                                 } catch {
 120                                         weight = 0.0f;
 121                                 }
 122                         } else {
 123                                 //ignore
 124                         }
 125                 }
 126         }
 127 }
 128