class/System.ServiceModel.Web/System.ServiceModel.Channels/WebMessageEncoder.cs

   1 //
   2 // WebMessageEncoder.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto  <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2008 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System;
  29 using System.IO;
  30 using System.Net.Mime;
  31 using System.Runtime.Serialization.Json;
  32 using System.ServiceModel;
  33 using System.Text;
  34 using System.Xml;
  35
  36 namespace System.ServiceModel.Channels
  37 {
  38         internal class WebMessageEncoder : MessageEncoder
  39         {
  40                 internal const string ScriptPropertyName = "618BC2B0-38AA-21A3-DB4A-404FC87B9B11"; // randomly generated
  41
  42                 WebMessageEncodingBindingElement source;
  43
  44                 public WebMessageEncoder (WebMessageEncodingBindingElement source)
  45                 {
  46                         this.source = source;
  47                 }
  48
  49                 public override string ContentType {
  50 #if NET_2_1
  51                         get { return MediaType; }
  52 #else
  53                         get { return MediaType + "; charset=" + source.WriteEncoding.HeaderName; }
  54 #endif
  55                 }
  56
  57                 // FIXME: find out how it can be customized.
  58                 public override string MediaType {
  59                         get { return "application/xml"; }
  60                 }
  61
  62                 public override MessageVersion MessageVersion {
  63                         get { return MessageVersion.None; }
  64                 }
  65
  66                 public override Message ReadMessage (ArraySegment<byte> buffer, BufferManager bufferManager, string contentType)
  67                 {
  68                         throw new NotImplementedException ();
  69                 }
  70
  71                 public override Message ReadMessage (Stream stream, int maxSizeOfHeaders, string contentType)
  72                 {
  73                         if (stream == null)
  74                                 throw new ArgumentNullException ("stream");
  75                         if (contentType == null)
  76                                 throw new ArgumentNullException ("contentType");
  77
  78                         Encoding enc = Encoding.UTF8;
  79                         ContentType ct = new ContentType (contentType);
  80                         if (ct.CharSet != null)
  81                                 enc = Encoding.GetEncoding (ct.CharSet);
  82
  83                         WebContentFormat fmt = WebContentFormat.Xml;
  84                         if (source.ContentTypeMapper != null)
  85                                 fmt = source.ContentTypeMapper.GetMessageFormatForContentType (contentType);
  86                         else {
  87                                 switch (ct.MediaType) {
  88                                 case "application/json":
  89                                         fmt = WebContentFormat.Json;
  90                                         break;
  91                                 case "application/xml":
  92                                         fmt = WebContentFormat.Xml;
  93                                         break;
  94                                 case "application/octet-stream":
  95                                         fmt = WebContentFormat.Raw;
  96                                         break;
  97                                 }
  98                         }
  99
 100                         Message msg = null;
 101                         WebBodyFormatMessageProperty wp = null;
 102                         switch (fmt) {
 103                         case WebContentFormat.Xml:
 104                                 // FIXME: is it safe/unsafe/required to keep XmlReader open?
 105                                 msg = Message.CreateMessage (MessageVersion.None, null, XmlReader.Create (new StreamReader (stream, enc)));
 106                                 wp = new WebBodyFormatMessageProperty (WebContentFormat.Xml);
 107                                 break;
 108                         case WebContentFormat.Json:
 109                                 // FIXME: is it safe/unsafe/required to keep XmlReader open?
 110 #if NET_2_1
 111                                 msg = Message.CreateMessage (MessageVersion.None, null, JsonReaderWriterFactory.CreateJsonReader (stream, source.ReaderQuotas));
 112 #else
 113                                 msg = Message.CreateMessage (MessageVersion.None, null, JsonReaderWriterFactory.CreateJsonReader (stream, enc, source.ReaderQuotas, null));
 114 #endif
 115                                 wp = new WebBodyFormatMessageProperty (WebContentFormat.Json);
 116                                 break;
 117                         case WebContentFormat.Raw:
 118                                 throw new NotImplementedException ();
 119                         default:
 120                                 throw new SystemException ("INTERNAL ERROR: cannot determine content format");
 121                         }
 122                         if (wp != null)
 123                                 msg.Properties.Add (WebBodyFormatMessageProperty.Name, wp);
 124                         return msg;
 125                 }
 126
 127                 WebContentFormat GetContentFormat (Message message)
 128                 {
 129                         string name = WebBodyFormatMessageProperty.Name;
 130                         if (message.Properties.ContainsKey (name))
 131                                 return ((WebBodyFormatMessageProperty) message.Properties [name]).Format;
 132
 133                         switch (MediaType) {
 134                         case "application/xml":
 135                         case "text/xml":
 136                                 return WebContentFormat.Xml;
 137                         case "application/json":
 138                         case "text/json":
 139                                 return WebContentFormat.Json;
 140                         case "application/octet-stream":
 141                                 return WebContentFormat.Raw;
 142                         default:
 143                                 return WebContentFormat.Default;
 144                         }
 145                 }
 146
 147                 public override void WriteMessage (Message message, Stream stream)
 148                 {
 149                         if (message == null)
 150                                 throw new ArgumentNullException ("message");
 151
 152                         // Handle /js and /jsdebug as the special cases.
 153                         var script = message.Properties [ScriptPropertyName] as string;
 154                         if (script != null) {
 155                                 var bytes = source.WriteEncoding.GetBytes (script);
 156                                 stream.Write (bytes, 0, bytes.Length);
 157                                 return;
 158                         }
 159
 160                         if (!MessageVersion.Equals (message.Version))
 161                                 throw new ProtocolException (String.Format ("MessageVersion {0} is not supported", message.Version));
 162                         if (stream == null)
 163                                 throw new ArgumentNullException ("stream");
 164
 165                         switch (GetContentFormat (message)) {
 166                         case WebContentFormat.Xml:
 167 #if NET_2_1
 168                                 using (XmlWriter w = XmlDictionaryWriter.CreateDictionaryWriter (XmlWriter.Create (new StreamWriter (stream, source.WriteEncoding))))
 169                                         message.WriteMessage (w);
 170 #else
 171                                 using (XmlWriter w = XmlDictionaryWriter.CreateTextWriter (stream, source.WriteEncoding))
 172                                         message.WriteMessage (w);
 173 #endif
 174                                 break;
 175                         case WebContentFormat.Json:
 176                                 using (XmlWriter w = JsonReaderWriterFactory.CreateJsonWriter (stream, source.WriteEncoding))
 177                                         message.WriteMessage (w);
 178                                 break;
 179                         case WebContentFormat.Raw:
 180                                 throw new NotImplementedException ();
 181                         case WebContentFormat.Default:
 182                                 throw new SystemException ("INTERNAL ERROR: cannot determine content format");
 183                         }
 184                 }
 185
 186                 public override ArraySegment<byte> WriteMessage (Message message, int maxMessageSize, BufferManager bufferManager,
 187                                                                  int messageOffset)
 188                 {
 189                         throw new NotImplementedException ();
 190                 }
 191         }
 192 }