mcs/class/System.Web/System.Web/StaticFileHandler.cs

   1 //
   2 // System.Web.StaticFileHandler
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2002 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.IO;
  33
  34 namespace System.Web
  35 {
  36         class StaticFileHandler : IHttpHandler
  37         {
  38                 public void ProcessRequest (HttpContext context)
  39                 {
  40                         HttpRequest request = context.Request;
  41                         HttpResponse response = context.Response;
  42                         string fileName = request.PhysicalPath;
  43                         FileInfo fi = new FileInfo (fileName);
  44                         if (!fi.Exists)
  45                                 throw new HttpException (404, "File '" + request.FilePath + "' not found.");
  46
  47                         if ((fi.Attributes & FileAttributes.Directory) != 0) {
  48                                 response.Redirect (request.Path + '/');
  49                                 return;
  50                         }
  51
  52                         string strHeader = request.Headers ["If-Modified-Since"];
  53                         try {
  54                                 if (strHeader != null) {
  55                                         DateTime dtIfModifiedSince = DateTime.ParseExact (strHeader, "r", null);
  56                                         DateTime ftime = fi.LastWriteTime.ToUniversalTime ();
  57                                         if (ftime <= dtIfModifiedSince) {
  58                                                 response.StatusCode = 304;
  59                                                 return;
  60                                         }
  61                                 }
  62                         } catch { }
  63
  64                         try {
  65                                 DateTime lastWT = fi.LastWriteTime.ToUniversalTime ();
  66                                 response.AddHeader ("Last-Modified", lastWT.ToString ("r"));
  67
  68                                 response.ContentType = MimeTypes.GetMimeType (fileName);
  69                                 response.WriteFile (fileName);
  70                         } catch (Exception) {
  71                                 throw new HttpException (403, "Forbidden.");
  72                         }
  73                 }
  74
  75                 public bool IsReusable {
  76                         get { return true; }
  77                 }
  78         }
  79 }
  80