mcs/class/System.Web/System.Web/HttpServerUtility.cs

   1 //
   2 // System.Web.HttpRequest.cs
   3 //
   4 //
   5 // Author:
   6 //      Miguel de Icaza (miguel@novell.com)
   7 //      Gonzalo Paniagua Javier (gonzalo@novell.com)
   8 //
   9
  10 //
  11 // Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.IO;
  34 using System.Web.UI;
  35 using System.Web.Util;
  36 using System.Collections.Specialized;
  37 using System.Security.Permissions;
  38 using System.Text;
  39 using System.Threading;
  40 using System.Web.Configuration;
  41 using System.Web.SessionState;
  42
  43 namespace System.Web
  44 {
  45         //
  46         // Methods exposed through HttpContext.Server property
  47         //
  48
  49         // CAS - no InheritanceDemand here as the class is sealed
  50         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  51         public sealed class HttpServerUtility {
  52                 HttpContext context;
  53
  54                 internal HttpServerUtility (HttpContext context)
  55                 {
  56                         this.context = context;
  57                 }
  58
  59                 public void ClearError ()
  60                 {
  61                         context.ClearError ();
  62                 }
  63
  64                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  65                 public object CreateObject (string progID)
  66                 {
  67                         throw new HttpException (500, "COM is not supported");
  68                 }
  69
  70                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  71                 public object CreateObject (Type type)
  72                 {
  73                         throw new HttpException (500, "COM is not supported");
  74                 }
  75
  76                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  77                 public object CreateObjectFromClsid (string clsid)
  78                 {
  79                         throw new HttpException (500, "COM is not supported");
  80                 }
  81
  82                 public void Execute (string path)
  83                 {
  84                         Execute (path, null, true);
  85                 }
  86
  87                 public void Execute (string path, TextWriter writer)
  88                 {
  89                         Execute (path, writer, true);
  90                 }
  91
  92                 public void Execute (string path, bool preserveForm)
  93                 {
  94                         Execute (path, null, preserveForm);
  95                 }
  96
  97                 public void Execute (string path, TextWriter writer, bool preserveForm)
  98                 {
  99                         Execute (path, writer, preserveForm, false);
 100                 }
 101
 102                 void Execute (string path, TextWriter writer, bool preserveForm, bool isTransfer)
 103                 {
 104                         if (path == null)
 105                                 throw new ArgumentNullException ("path");
 106
 107                         if (path.IndexOf (':') != -1)
 108                                 throw new ArgumentException ("Invalid path.");
 109
 110                         string queryString = null;
 111                         int qmark = path.IndexOf ('?');
 112                         if (qmark != -1) {
 113                                 queryString = path.Substring (qmark + 1);
 114                                 path = path.Substring (0, qmark);
 115                         }
 116
 117                         string exePath = UrlUtils.Combine (context.Request.BaseVirtualDir, path);
 118                         bool cookieless = false;
 119                         SessionStateSection config = WebConfigurationManager.GetWebApplicationSection ("system.web/sessionState") as SessionStateSection;
 120                         cookieless = SessionStateModule.IsCookieLess (context, config);
 121
 122                         if (cookieless)
 123                                 exePath = UrlUtils.RemoveSessionId (VirtualPathUtility.GetDirectory (exePath), exePath);
 124
 125                         IHttpHandler handler = context.ApplicationInstance.GetHandler (context, exePath, true);
 126                         Execute (handler, writer, preserveForm, exePath, queryString, isTransfer, true);
 127                 }
 128
 129                 internal void Execute (IHttpHandler handler, TextWriter writer, bool preserveForm, string exePath, string queryString, bool isTransfer, bool isInclude)
 130                 {
 131                         // If the target handler is not Page, the transfer must not occur.
 132                         // InTransit == true means we're being called from Transfer
 133                         bool is_static = (handler is StaticFileHandler);
 134                         if (isTransfer && !(handler is Page) && !is_static)
 135                                 throw new HttpException ("Transfer is only allowed to .aspx and static files");
 136
 137                         HttpRequest request = context.Request;
 138                         string oldQuery = request.QueryStringRaw;
 139                         if (queryString != null) {
 140                                 request.QueryStringRaw = queryString;
 141                         } else if (!preserveForm) {
 142                                 request.QueryStringRaw = String.Empty;
 143                         }
 144
 145                         HttpResponse response = context.Response;
 146                         WebROCollection oldForm = request.Form as WebROCollection;
 147                         if (!preserveForm) {
 148                                 request.SetForm (new WebROCollection ());
 149                         }
 150
 151                         TextWriter output = writer;
 152                         if (output == null)
 153                                 output = response.Output;
 154
 155                         TextWriter previous = response.SetTextWriter (output);
 156                         string oldExePath = request.CurrentExecutionFilePath;
 157                         bool oldIsInclude = context.IsProcessingInclude;
 158                         try {
 159                                 context.PushHandler (handler);
 160                                 if (is_static) // Not sure if this should apply to Page too
 161                                         request.SetFilePath (exePath);
 162
 163                                 request.SetCurrentExePath (exePath);
 164                                 context.IsProcessingInclude = isInclude;
 165
 166                                 if (!(handler is IHttpAsyncHandler)) {
 167                                         handler.ProcessRequest (context);
 168                                 } else {
 169                                         IHttpAsyncHandler asyncHandler = (IHttpAsyncHandler) handler;
 170                                         IAsyncResult ar = asyncHandler.BeginProcessRequest (context, null, null);
 171                                         WaitHandle asyncWaitHandle = ar != null ? ar.AsyncWaitHandle : null;
 172                                         if (asyncWaitHandle != null)
 173                                                 asyncWaitHandle.WaitOne ();
 174                                         asyncHandler.EndProcessRequest (ar);
 175                                 }
 176                         } finally {
 177                                 if (oldQuery != request.QueryStringRaw) {
 178                                         if (oldQuery != null && oldQuery.Length > 0) {
 179                                                 oldQuery = oldQuery.Substring (1); // Ignore initial '?'
 180                                                 request.QueryStringRaw = oldQuery; // which is added here.
 181                                         } else
 182                                                 request.QueryStringRaw = String.Empty;
 183                                 }
 184
 185                                 response.SetTextWriter (previous);
 186                                 if (!preserveForm)
 187                                         request.SetForm (oldForm);
 188
 189                                 context.PopHandler ();
 190                                 request.SetCurrentExePath (oldExePath);
 191                                 context.IsProcessingInclude = oldIsInclude;
 192                         }
 193                 }
 194
 195                 public Exception GetLastError ()
 196                 {
 197                         if (context == null)
 198                                 return HttpContext.Current.Error;
 199                         return context.Error;
 200                 }
 201
 202                 public string HtmlDecode (string s)
 203                 {
 204                         return HttpUtility.HtmlDecode (s);
 205                 }
 206
 207                 public void HtmlDecode (string s, TextWriter output)
 208                 {
 209                         HttpUtility.HtmlDecode (s, output);
 210                 }
 211
 212                 public string HtmlEncode (string s)
 213                 {
 214                         return HttpUtility.HtmlEncode (s);
 215                 }
 216
 217                 public void HtmlEncode (string s, TextWriter output)
 218                 {
 219                         HttpUtility.HtmlEncode (s, output);
 220                 }
 221
 222                 public string MapPath (string path)
 223                 {
 224                         return context.Request.MapPath (path);
 225                 }
 226
 227
 228                 public void TransferRequest (string path)
 229                 {
 230                         TransferRequest (path, false, null, null);
 231                 }
 232
 233                 public void TransferRequest (string path, bool preserveForm)
 234                 {
 235                         TransferRequest (path, preserveForm, null, null);
 236                 }
 237
 238                 [MonoTODO ("Always throws PlatformNotSupportedException.")]
 239                 public void TransferRequest (string path, bool preserveForm, string method, NameValueCollection headers)
 240                 {
 241                         throw new PlatformNotSupportedException ();
 242                 }
 243
 244                 public void Transfer (string path)
 245                 {
 246                         Transfer (path, true);
 247                 }
 248
 249                 public void Transfer (string path, bool preserveForm) {
 250                         Execute (path, null, preserveForm, true);
 251                         context.Response.End ();
 252                 }
 253
 254                 public void Transfer (IHttpHandler handler, bool preserveForm)
 255                 {
 256                         if (handler == null)
 257                                 throw new ArgumentNullException ("handler");
 258
 259                         // TODO: see the MS doc and search for "enableViewStateMac": this method is not
 260                         // allowed for pages when preserveForm is true and the page IsCallback property
 261                         // is true.
 262                         Execute (handler, null, preserveForm, context.Request.CurrentExecutionFilePath, null, true, true);
 263                         context.Response.End ();
 264                 }
 265
 266                 public void Execute (IHttpHandler handler, TextWriter writer, bool preserveForm)
 267                 {
 268                         if (handler == null)
 269                                 throw new ArgumentNullException ("handler");
 270
 271                         Execute (handler, writer, preserveForm, context.Request.CurrentExecutionFilePath, null, false, true);
 272                 }
 273
 274                 public static byte[] UrlTokenDecode (string input)
 275                 {
 276                         if (input == null)
 277                                 throw new ArgumentNullException ("input");
 278                         if (input.Length < 1)
 279                                 return new byte[0];
 280                         byte[] bytes = Encoding.ASCII.GetBytes (input);
 281                         int inputLength = input.Length - 1;
 282                         int equalsCount = (int)(((char)bytes[inputLength]) - 0x30);
 283                         char[] ret = new char[inputLength + equalsCount];
 284                         int i = 0;
 285                         for (; i < inputLength; i++) {
 286                                 switch ((char)bytes[i]) {
 287                                         case '-':
 288                                                 ret[i] = '+';
 289                                                 break;
 290
 291                                         case '_':
 292                                                 ret[i] = '/';
 293                                                 break;
 294
 295                                         default:
 296                                                 ret[i] = (char)bytes[i];
 297                                                 break;
 298                                 }
 299                         }
 300                         while (equalsCount > 0) {
 301                                 ret[i++] = '=';
 302                                 equalsCount--;
 303                         }
 304
 305                         return Convert.FromBase64CharArray (ret, 0, ret.Length);
 306                 }
 307
 308                 public static string UrlTokenEncode (byte[] input)
 309                 {
 310                         if (input == null)
 311                                 throw new ArgumentNullException ("input");
 312                         if (input.Length < 1)
 313                                 return String.Empty;
 314                         string base64 = Convert.ToBase64String (input);
 315                         int retlen;
 316                         if (base64 == null || (retlen = base64.Length) == 0)
 317                                 return String.Empty;
 318
 319                         // MS.NET implementation seems to process the base64
 320                         // string before returning. It replaces the chars:
 321                         //
 322                         //  + with -
 323                         //  / with _
 324                         //
 325                         // Then removes trailing ==, which may appear in the
 326                         // base64 string, and replaces them with a single digit
 327                         // that's the count of removed '=' characters (0 if none
 328                         // were removed)
 329                         int equalsCount = 0x30;
 330                         while (retlen > 0 && base64[retlen - 1] == '=') {
 331                                 equalsCount++;
 332                                 retlen--;
 333                         }
 334                         char[] chars = new char[retlen + 1];
 335                         chars[retlen] = (char)equalsCount;
 336                         for (int i = 0; i < retlen; i++) {
 337                                 switch (base64[i]) {
 338                                         case '+':
 339                                                 chars[i] = '-';
 340                                                 break;
 341
 342                                         case '/':
 343                                                 chars[i] = '_';
 344                                                 break;
 345
 346                                         default:
 347                                                 chars[i] = base64[i];
 348                                                 break;
 349                                 }
 350                         }
 351                         return new string (chars);
 352                 }
 353
 354                 public string UrlDecode (string s)
 355                 {
 356                         HttpRequest request = context.Request;
 357                         if(request != null)
 358                                 return HttpUtility.UrlDecode (s, request.ContentEncoding);
 359                         else
 360                                 return HttpUtility.UrlDecode (s);
 361                 }
 362
 363                 public void UrlDecode (string s, TextWriter output)
 364                 {
 365                         if (s != null)
 366                                 output.Write (UrlDecode (s));
 367                 }
 368
 369                 public string UrlEncode (string s)
 370                 {
 371                         HttpResponse response = context.Response;
 372                         if (response != null)
 373                                 return HttpUtility.UrlEncode (s, response.ContentEncoding);
 374                         else
 375                                 return HttpUtility.UrlEncode (s);
 376                 }
 377
 378                 public void UrlEncode (string s, TextWriter output)
 379                 {
 380                         if (s != null)
 381                                 output.Write (UrlEncode (s));
 382                 }
 383
 384                 public string UrlPathEncode (string s)
 385                 {
 386                         if (s == null)
 387                                 return null;
 388
 389                         int idx = s.IndexOf ('?');
 390                         string s2 = null;
 391                         if (idx != -1) {
 392                                 s2 = s.Substring (0, idx);
 393                                 s2 = HttpUtility.UrlEncode (s2) + s.Substring (idx);
 394                         } else {
 395                                 s2 = HttpUtility.UrlEncode (s);
 396                         }
 397
 398                         return s2;
 399                 }
 400
 401                 public string MachineName {
 402                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 403                         // Medium doesn't look heavy enough to replace this... reported as
 404                         [SecurityPermission (SecurityAction.Assert, UnmanagedCode = true)]
 405                         [EnvironmentPermission (SecurityAction.Assert, Read = "COMPUTERNAME")]
 406                         get { return Environment.MachineName; }
 407                 }
 408
 409                 public int ScriptTimeout {
 410                         get { return (int) context.ConfigTimeout.TotalSeconds; }
 411                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 412                         set { context.ConfigTimeout = TimeSpan.FromSeconds (value); }
 413                 }
 414         }
 415 }