mcs/class/System.Web/System.Web/DefaultHttpHandler.cs

   1 //
   2 // System.Web.DefaultHttpHandler
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 //
   8 // Copyright (C) 2006-2009 Novell, Inc (http://www.novell.com)
   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.Collections.Specialized;
  31 using System.Threading;
  32
  33 namespace System.Web
  34 {
  35         public class DefaultHttpHandler : IHttpAsyncHandler
  36         {
  37                 sealed class DefaultHandlerAsyncResult : IAsyncResult
  38                 {
  39                         public object AsyncState {
  40                                 get;
  41                                 private set;
  42                         }
  43
  44                         public WaitHandle AsyncWaitHandle {
  45                                 get { return null; }
  46                         }
  47
  48                         public bool CompletedSynchronously {
  49                                 get { return true; }
  50                         }
  51
  52                         public bool IsCompleted {
  53                                 get { return true; }
  54                         }
  55
  56                         public DefaultHandlerAsyncResult (AsyncCallback callback, object state)
  57                         {
  58                                 this.AsyncState = state;
  59
  60                                 if (callback != null)
  61                                         callback (this);
  62                         }
  63                 }
  64
  65                 NameValueCollection executeUrlHeaders;
  66
  67                 protected HttpContext Context {
  68                         get;
  69                         private set;
  70                 }
  71
  72                 public virtual bool IsReusable {
  73                         get { return false; }
  74                 }
  75
  76                 protected NameValueCollection ExecuteUrlHeaders {
  77                         get {
  78                                 HttpContext context = Context;
  79                                 HttpRequest req = context != null ? context.Request : null;
  80                                 if (req != null && executeUrlHeaders != null)
  81                                         executeUrlHeaders = new NameValueCollection (req.Headers);
  82
  83                                 return executeUrlHeaders;
  84                         }
  85                 }
  86
  87                 public virtual IAsyncResult BeginProcessRequest (HttpContext context, AsyncCallback callback, object state)
  88                 {
  89                         this.Context = context;
  90
  91                         HttpRequest req = context != null ? context.Request : null;
  92                         string filePath = req != null ? req.FilePath : null;
  93
  94                         if (!String.IsNullOrEmpty (filePath) && String.Compare (".asp", VirtualPathUtility.GetExtension (filePath), StringComparison.OrdinalIgnoreCase) == 0)
  95                                 throw new HttpException (String.Format ("Access to file '{0}' is forbidden.", filePath));
  96
  97                         if (req != null && String.Compare ("POST", req.HttpMethod, StringComparison.OrdinalIgnoreCase) == 0)
  98                                 throw new HttpException (String.Format ("Method '{0}' is not allowed when accessing file '{1}'", req.HttpMethod, filePath));
  99
 100                         var sfh = new StaticFileHandler ();
 101                         sfh.ProcessRequest (context);
 102
 103                         return new DefaultHandlerAsyncResult (callback, state);
 104                 }
 105
 106                 public virtual void EndProcessRequest (IAsyncResult result)
 107                 {
 108                         // nothing to do
 109                 }
 110
 111                 public virtual void ProcessRequest (HttpContext context)
 112                 {
 113                         throw new InvalidOperationException ("The ProcessRequest cannot be called synchronously.");
 114                 }
 115
 116                 public virtual void OnExecuteUrlPreconditionFailure ()
 117                 {
 118                         // nothing to do
 119                 }
 120
 121                 public virtual string OverrideExecuteUrlPath ()
 122                 {
 123                         return null;
 124                 }
 125         }
 126 }
 127