mcs/class/System.XML/System.Xml/XmlUrlResolver.cs

   1 // System.Xml.XmlUrlResolver.cs
   2 //
   3 // Author: Duncan Mak (duncan@ximian.com)
   4 //         Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
   5 //
   6 // (C) Ximian, Inc.
   7 //
   8
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Net;
  31 using System.IO;
  32 using System.Text;
  33
  34 namespace System.Xml
  35 {
  36         public class XmlUrlResolver : XmlResolver
  37         {
  38                 // Field
  39                 ICredentials credential;
  40                 WebClient webClientInternal;
  41                 WebClient webClient {
  42                         get {
  43                                 if (webClientInternal == null)
  44                                         webClientInternal = new WebClient ();
  45                                 return webClientInternal;
  46                         }
  47                 }
  48
  49                 // Constructor
  50                 public XmlUrlResolver ()
  51                         : base ()
  52                 {
  53                 }
  54
  55                 // Properties
  56                 public override ICredentials Credentials
  57                 {
  58                         set { credential = value; }
  59                 }
  60
  61                 // Methods
  62                 public override object GetEntity (Uri absoluteUri, string role, Type ofObjectToReturn)
  63                 {
  64                         if (ofObjectToReturn == null)
  65                                 ofObjectToReturn = typeof (Stream);
  66                         if (ofObjectToReturn != typeof (Stream))
  67                                 throw new XmlException ("This object type is not supported.");
  68
  69                         if (absoluteUri.Scheme == "file") {
  70                                 if (absoluteUri.AbsolutePath == String.Empty)
  71                                         throw new ArgumentException ("uri must be absolute.", "absoluteUri");
  72                                 return new FileStream (UnescapeRelativeUriBody (absoluteUri.LocalPath), FileMode.Open, FileAccess.Read, FileShare.Read);
  73                         }
  74
  75                         // (MS documentation says) parameter role isn't used yet.
  76                         Stream s = null;
  77                         using (s) {
  78                                 WebClient wc = new WebClient ();
  79                                 wc.Credentials = credential;
  80                                 byte [] data = wc.DownloadData (absoluteUri.ToString ());
  81                                 wc.Dispose ();
  82                                 return new MemoryStream (data, 0, data.Length);
  83                         }
  84                 }
  85
  86                 // see also XmlResolver.EscapeRelativeUriBody().
  87                 private string UnescapeRelativeUriBody (string src)
  88                 {
  89                         return src.Replace ("%3C", "<")
  90                                 .Replace ("%3E", ">")
  91                                 .Replace ("%23", "#")
  92                                 .Replace ("%25", "%")
  93                                 .Replace ("%22", "\"");
  94                 }
  95         }
  96 }