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C# File upload with safe filename

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  1. public String Upload()
  2.         {
  3.             var fileName = Path.GetFileNameWithoutExtension(Request.Files[0].FileName);
  4.             string extension = System.IO.Path.GetExtension(Request.Files[0].FileName);
  5.  
  6.             if (Request.Files.Count > 0 && extension == ".pdf")
  7.             {
  8.                 Request.Files[0].SaveAs(Server.MapPath("/Content/userfiles/wholesale/") + FilenameFromTitle(fileName, extension));
  9.                 return "1";
  10.             }
  11.  
  12.             else
  13.             {
  14.                 return "0";
  15.             }  
  16.         }
  17.  
  18.         public static string FilenameFromTitle(string name, string extension)
  19.         {
  20.             DateTime time = DateTime.Now;
  21.             string format = "MMddyy_HHmmss";
  22.             //Console.WriteLine(time.ToString(format));
  23.  
  24.             // first trim the raw string
  25.             string safe = name.Trim();
  26.  
  27.             // replace spaces with hyphens
  28.             safe = safe.Replace(" ", "-").ToLower();
  29.  
  30.             // replace any 'double spaces' with singles
  31.             if(safe.IndexOf("--") > -1)
  32.                 while(safe.IndexOf("--") > -1)
  33.                     safe = safe.Replace("--", "-");
  34.  
  35.             // trim out illegal characters
  36.             safe = Regex.Replace(safe, "[^a-z0-9\\-]", "");
  37.  
  38.  
  39.             // trim the length
  40.             if(safe.Length > 50)
  41.                 safe = safe.Substring(0, 49);
  42.  
  43.             // clean the beginning and end of the filename
  44.             char[] replace = {'-','.'};
  45.             safe = safe.TrimStart(replace);
  46.             safe = safe.TrimEnd(replace);
  47.             safe = safe.ToLower() + "_" + time.ToString(format) + extension;
  48.             //safe = safe.ToLower() + extension;
  49.  
  50.             return safe;
  51.         }

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