mcs/class/System/System.Net/GlobalProxySelection.cs

   1 //
   2 // System.Net.GlobalProxySelection
   3 //
   4 // Author:
   5 //   Lawrence Pit (loz@cable.a2000.nl)
   6 //
   7
   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
  29 using System;
  30 using System.Collections;
  31 using System.Configuration;
  32 using System.IO;
  33 using System.Runtime.Serialization;
  34 #if NET_2_0
  35 using System.Net.Configuration;
  36 #endif
  37
  38 namespace System.Net
  39 {
  40 #if NET_2_0
  41         [ObsoleteAttribute("Use WebRequest.DefaultProxy instead")]
  42 #endif
  43         public class GlobalProxySelection
  44         {
  45                 // Constructors
  46                 public GlobalProxySelection() { }
  47
  48                 // Properties
  49
  50 #if !NET_2_0
  51                 volatile static IWebProxy proxy;
  52                 static readonly object lockobj = new object ();
  53
  54                 static IWebProxy GetProxy ()
  55                 {
  56                         lock (lockobj) {
  57                                 if (proxy != null)
  58                                         return proxy;
  59
  60                                 object p = ConfigurationSettings.GetConfig ("system.net/defaultProxy");
  61                                 if (p == null)
  62                                         p = new EmptyWebProxy ();
  63                                 proxy = (IWebProxy) p;
  64                         }
  65
  66                         return proxy;
  67                 }
  68 #endif
  69
  70                 public static IWebProxy Select {
  71 #if NET_2_0
  72                         get { return WebRequest.DefaultWebProxy; }
  73                         set { WebRequest.DefaultWebProxy = value; }
  74 #else
  75                         get { return GetProxy (); }
  76                         set {
  77                                 if (value == null)
  78                                         throw new ArgumentNullException ("GlobalProxySelection.Select",
  79                                                         "null IWebProxy not allowed. Use GetEmptyWebProxy ()");
  80                                 proxy = value;
  81                         }
  82 #endif
  83                 }
  84
  85                 // Methods
  86
  87                 public static IWebProxy GetEmptyWebProxy()
  88                 {
  89                         // must return a new one each time, as the credentials
  90                         // can be set
  91                         return new EmptyWebProxy ();
  92                 }
  93
  94                 // Internal Classes
  95
  96                 internal class EmptyWebProxy : IWebProxy {
  97                         private ICredentials credentials = null;
  98
  99                         internal EmptyWebProxy () { }
 100
 101                         public ICredentials Credentials {
 102                                 get { return credentials; }
 103                                 set { credentials = value; }
 104                         }
 105
 106                         public Uri GetProxy (Uri destination)
 107                         {
 108                                 return destination;
 109                         }
 110
 111                         public bool IsBypassed (Uri host)
 112                         {
 113                                 return true; // pass directly to host
 114                         }
 115                 }
 116         }
 117 }