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 using System;
  11 using System.IO;
  12
  13 namespace System.Web
  14 {
  15         class StaticFileHandler : IHttpHandler
  16         {
  17                 public void ProcessRequest (HttpContext context)
  18                 {
  19                         HttpRequest request = context.Request;
  20                         HttpResponse response = context.Response;
  21                         string fileName = request.PhysicalPath;
  22                         FileInfo fi = new FileInfo (fileName);
  23                         if (!fi.Exists)
  24                                 throw new HttpException (404, "File '" + fileName + "' does not exist");
  25
  26                         if ((fi.Attributes & FileAttributes.Directory) != 0) {
  27                                 response.Redirect (request.Path + '/');
  28                                 return;
  29                         }
  30
  31                         string strHeader = request.Headers ["If-Modified-Since"];
  32                         try {
  33                                 if (strHeader != null) {
  34                                         DateTime dtIfModifiedSince = DateTime.ParseExact (strHeader, "r", null);
  35                                         DateTime ftime = fi.LastWriteTime.ToUniversalTime ();
  36                                         if (ftime <= dtIfModifiedSince) {
  37                                                 response.StatusCode = 304;
  38                                                 return;
  39                                         }
  40                                 }
  41                         } catch { }
  42
  43                         try {
  44                                 DateTime lastWT = fi.LastWriteTime.ToUniversalTime ();
  45                                 response.AddHeader ("Last-Modified", lastWT.ToString ("r"));
  46
  47                                 response.WriteFile (fileName);
  48                                 response.ContentType = MimeTypes.GetMimeType (fileName);
  49                         } catch (Exception e) {
  50                                 throw new HttpException (401, "Forbidden");
  51                         }
  52                 }
  53
  54                 public bool IsReusable
  55                 {
  56                         get {
  57                                 return true;
  58                         }
  59                 }
  60         }
  61 }
  62