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

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