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 // (C) 2003-2009 Novell, Inc (http://novell.com)
   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;
  33 using System.Globalization;
  34 using System.IO;
  35 using System.Web.Util;
  36 using System.Web.Hosting;
  37
  38 namespace System.Web
  39 {
  40         class StaticFileHandler : IHttpHandler
  41         {
  42                 static bool ValidFileName (string fileName)
  43                 {
  44                         if (!RuntimeHelpers.RunningOnWindows)
  45                                 return true;
  46
  47                         if (fileName == null || fileName.Length == 0)
  48                                 return false;
  49
  50                         return (!StrUtils.EndsWith (fileName, " ") && !StrUtils.EndsWith (fileName, "."));
  51                 }
  52
  53                 public void ProcessRequest (HttpContext context)
  54                 {
  55                         HttpRequest request = context.Request;
  56                         HttpResponse response = context.Response;
  57
  58                         if (HostingEnvironment.HaveCustomVPP) {
  59                                 VirtualFile vf = null;
  60                                 VirtualPathProvider vpp = HostingEnvironment.VirtualPathProvider;
  61                                 string vpath = request.FilePath;
  62
  63                                 if (vpp.FileExists (vpath))
  64                                         vf = vpp.GetFile (vpath);
  65
  66                                 if (vf == null)
  67                                         throw new HttpException (404, "Path '" + vpath + "' was not found.", vpath);
  68
  69                                 response.ContentType = MimeTypes.GetMimeType (vpath);
  70                                 response.TransmitFile (vf, true);
  71                                 return;
  72                         }
  73
  74                         string fileName = request.PhysicalPath;
  75                         FileInfo fi = new FileInfo (fileName);
  76                         if (!fi.Exists || !ValidFileName (fileName))
  77                                 throw new HttpException (404, "Path '" + request.FilePath + "' was not found.", request.FilePath);
  78
  79                         if ((fi.Attributes & FileAttributes.Directory) != 0) {
  80                                 response.Redirect (request.Path + '/');
  81                                 return;
  82                         }
  83
  84                         string strHeader = request.Headers ["If-Modified-Since"];
  85                         try {
  86                                 if (strHeader != null) {
  87                                         DateTime dtIfModifiedSince = DateTime.ParseExact (strHeader, "r", null);
  88                                         DateTime ftime;
  89                                         ftime = fi.LastWriteTime.ToUniversalTime ();
  90                                         if (ftime <= dtIfModifiedSince) {
  91                                                 response.ContentType = MimeTypes.GetMimeType (fileName);
  92                                                 response.StatusCode = 304;
  93                                                 return;
  94                                         }
  95                                 }
  96                         } catch { }
  97
  98                         try {
  99                                 DateTime lastWT = fi.LastWriteTime.ToUniversalTime ();
 100                                 response.AddHeader ("Last-Modified", lastWT.ToString ("r"));
 101                                 response.ContentType = MimeTypes.GetMimeType (fileName);
 102                                 response.TransmitFile (fileName, true);
 103                         } catch (Exception) {
 104                                 throw new HttpException (403, "Forbidden.");
 105                         }
 106                 }
 107
 108                 public bool IsReusable {
 109                         get { return true; }
 110                 }
 111         }
 112 }
 113