class/System.Runtime.Remoting/System.Runtime.Remoting.Channels.Http/HttpRemotingHandlerFactory.cs

   1 //
   2 // System.Runtime.Remoting.Channels.Http.HttpRemotingHandlerFactory
   3 //
   4 // Authors:
   5 //      Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //      Lluis Sanchez Gual (lluis@ximian.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Web;
  33 using System.IO;
  34 using System.Runtime.Remoting;
  35 using System.Runtime.Remoting.Channels;
  36
  37 namespace System.Runtime.Remoting.Channels.Http
  38 {
  39         public class HttpRemotingHandlerFactory : IHttpHandlerFactory
  40         {
  41                 static bool webConfigLoaded = false;
  42                 static HttpServerTransportSink transportSink = null;
  43
  44                 public HttpRemotingHandlerFactory ()
  45                 {
  46                 }
  47
  48                 public IHttpHandler GetHandler (HttpContext context,
  49                                                 string verb,
  50                                                 string url,
  51                                                 string filePath)
  52                 {
  53                         if (!webConfigLoaded)
  54                                 ConfigureHttpChannel (context);
  55
  56                         return new HttpRemotingHandler (transportSink);
  57                 }
  58
  59                 void ConfigureHttpChannel (HttpContext context)
  60                 {
  61                         lock (GetType())
  62                         {
  63                                 if (webConfigLoaded) return;
  64
  65                                 string appConfig = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;
  66                                 if (File.Exists (appConfig))
  67                                         RemotingConfiguration.Configure (appConfig);
  68
  69                                 // Look for a channel that wants to receive http request
  70                                 IChannelReceiverHook chook = null;
  71                                 foreach (IChannel channel in ChannelServices.RegisteredChannels)
  72                                 {
  73                                         chook = channel as IChannelReceiverHook;
  74                                         if (chook == null) continue;
  75
  76                                         if (chook.ChannelScheme != "http")
  77                                                 throw new RemotingException ("Only http channels are allowed when hosting remoting objects in a web server");
  78
  79                                         if (!chook.WantsToListen)
  80                                         {
  81                                                 chook = null;
  82                                                 continue;
  83                                         }
  84
  85                                         //found chook
  86                                         break;
  87                                 }
  88
  89                                 if (chook == null)
  90                                 {
  91                                         HttpChannel chan = new HttpChannel();
  92                                         ChannelServices.RegisterChannel(chan);
  93                                         chook = chan;
  94                                 }
  95
  96                                 // Register the uri for the channel. The channel uri includes the scheme, the
  97                                 // host and the application path
  98
  99                                 string channelUrl = context.Request.Url.GetLeftPart(UriPartial.Authority);
 100                                 channelUrl += context.Request.ApplicationPath;
 101                                 chook.AddHookChannelUri (channelUrl);
 102
 103                                 transportSink = new HttpServerTransportSink (chook.ChannelSinkChain);
 104                                 webConfigLoaded = true;
 105                         }
 106                 }
 107
 108                 public void ReleaseHandler (IHttpHandler handler)
 109                 {
 110                 }
 111         }
 112 }