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 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.Web.Configuration;
  40 using System.Web.SessionState;
  41
  42 namespace System.Web {
  43
  44         //
  45         // Methods exposed through HttpContext.Server property
  46         //
  47
  48         // CAS - no InheritanceDemand here as the class is sealed
  49         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  50         public sealed class HttpServerUtility {
  51                 HttpContext context;
  52
  53                 internal HttpServerUtility (HttpContext context)
  54                 {
  55                         this.context = context;
  56                 }
  57
  58                 public void ClearError ()
  59                 {
  60                         context.ClearError ();
  61                 }
  62
  63                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  64                 public object CreateObject (string progID)
  65                 {
  66                         throw new HttpException (500, "COM is not supported");
  67                 }
  68
  69                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  70                 public object CreateObject (Type type)
  71                 {
  72                         throw new HttpException (500, "COM is not supported");
  73                 }
  74
  75                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
  76                 public object CreateObjectFromClsid (string clsid)
  77                 {
  78                         throw new HttpException (500, "COM is not supported");
  79                 }
  80
  81                 public void Execute (string path)
  82                 {
  83                         Execute (path, null, true);
  84                 }
  85
  86                 public void Execute (string path, TextWriter writer)
  87                 {
  88                         Execute (path, writer, true);
  89                 }
  90
  91 #if NET_2_0
  92                 public void Execute (string path, bool preserveForm)
  93                 {
  94                         Execute (path, null, preserveForm);
  95                 }
  96 #endif
  97
  98 #if NET_2_0
  99                 public
 100 #else
 101                 internal
 102 #endif
 103                 void Execute (string path, TextWriter writer, bool preserveForm)
 104                 {
 105                         Execute (path, writer, preserveForm, false);
 106                 }
 107
 108                 void Execute (string path, TextWriter writer, bool preserveForm, bool isTransfer)
 109                 {
 110                         if (path == null)
 111                                 throw new ArgumentNullException ("path");
 112
 113                         if (path.IndexOf (':') != -1)
 114                                 throw new ArgumentException ("Invalid path.");
 115
 116                         string queryString = null;
 117                         int qmark = path.IndexOf ('?');
 118                         if (qmark != -1) {
 119                                 queryString = path.Substring (qmark + 1);
 120                                 path = path.Substring (0, qmark);
 121                         }
 122
 123                         string exePath = UrlUtils.Combine (context.Request.BaseVirtualDir, path);
 124                         bool cookieless = false;
 125
 126 #if NET_2_0
 127                         SessionStateSection config = WebConfigurationManager.GetWebApplicationSection ("system.web/sessionState") as SessionStateSection;
 128                         cookieless = SessionStateModule.IsCookieLess (context, config);
 129 #else
 130                         SessionConfig config = HttpContext.GetAppConfig ("system.web/sessionState") as SessionConfig;
 131                         cookieless = config.CookieLess;
 132 #endif
 133                         if (cookieless)
 134                                 exePath = UrlUtils.RemoveSessionId (VirtualPathUtility.GetDirectory (exePath), exePath);
 135
 136                         IHttpHandler handler = context.ApplicationInstance.GetHandler (context, exePath, true);
 137                         Execute (handler, writer, preserveForm, exePath, queryString, isTransfer, true);
 138                 }
 139
 140                 internal void Execute (IHttpHandler handler, TextWriter writer, bool preserveForm, string exePath, string queryString, bool isTransfer, bool isInclude) {
 141 #if NET_2_0 && !TARGET_J2EE
 142                         // If the target handler is not Page, the transfer must not occur.
 143                         // InTransit == true means we're being called from Transfer
 144                         bool is_static = (handler is StaticFileHandler);
 145                         if (isTransfer && !(handler is Page) && !is_static)
 146                                 throw new HttpException ("Transfer is only allowed to .aspx and static files");
 147 #endif
 148
 149                         HttpRequest request = context.Request;
 150                         string oldQuery = request.QueryStringRaw;
 151                         if (queryString != null) {
 152                                 request.QueryStringRaw = queryString;
 153                         } else if (!preserveForm) {
 154                                 request.QueryStringRaw = String.Empty;
 155                         }
 156
 157                         HttpResponse response = context.Response;
 158                         WebROCollection oldForm = request.Form as WebROCollection;
 159                         if (!preserveForm) {
 160                                 request.SetForm (new WebROCollection ());
 161                         }
 162
 163                         TextWriter output = writer;
 164                         if (output == null)
 165                                 output = response.Output;
 166
 167                         TextWriter previous = response.SetTextWriter (output);
 168                         string oldExePath = request.CurrentExecutionFilePath;
 169                         bool oldIsInclude = context.IsProcessingInclude;
 170                         try {
 171 #if NET_2_0
 172                                 context.PushHandler (handler);
 173                                 if (is_static) // Not sure if this should apply to Page too
 174                                         request.SetFilePath (exePath);
 175 #endif
 176                                 request.SetCurrentExePath (exePath);
 177                                 context.IsProcessingInclude = isInclude;
 178
 179                                 if (!(handler is IHttpAsyncHandler)) {
 180                                         handler.ProcessRequest (context);
 181                                 } else {
 182                                         IHttpAsyncHandler asyncHandler = (IHttpAsyncHandler) handler;
 183                                         IAsyncResult ar = asyncHandler.BeginProcessRequest (context, null, null);
 184                                         ar.AsyncWaitHandle.WaitOne ();
 185                                         asyncHandler.EndProcessRequest (ar);
 186                                 }
 187                         } finally {
 188                                 if (oldQuery != request.QueryStringRaw) {
 189                                         if (oldQuery != null && oldQuery.Length > 0) {
 190                                                 oldQuery = oldQuery.Substring (1); // Ignore initial '?'
 191                                                 request.QueryStringRaw = oldQuery; // which is added here.
 192                                         } else
 193                                                 request.QueryStringRaw = String.Empty;
 194                                 }
 195
 196                                 response.SetTextWriter (previous);
 197                                 if (!preserveForm)
 198                                         request.SetForm (oldForm);
 199 #if NET_2_0
 200                                 context.PopHandler ();
 201 #endif
 202                                 request.SetCurrentExePath (oldExePath);
 203                                 context.IsProcessingInclude = oldIsInclude;
 204                         }
 205                 }
 206
 207                 public Exception GetLastError ()
 208                 {
 209                         if (context == null)
 210                                 return HttpContext.Current.Error;
 211                         return context.Error;
 212                 }
 213
 214                 public string HtmlDecode (string s)
 215                 {
 216                         return HttpUtility.HtmlDecode (s);
 217                 }
 218
 219                 public void HtmlDecode (string s, TextWriter output)
 220                 {
 221                         HttpUtility.HtmlDecode (s, output);
 222                 }
 223
 224                 public string HtmlEncode (string s)
 225                 {
 226                         return HttpUtility.HtmlEncode (s);
 227                 }
 228
 229                 public void HtmlEncode (string s, TextWriter output)
 230                 {
 231                         HttpUtility.HtmlEncode (s, output);
 232                 }
 233
 234                 public string MapPath (string path)
 235                 {
 236                         return context.Request.MapPath (path);
 237                 }
 238
 239                 public void Transfer (string path)
 240                 {
 241                         Transfer (path, true);
 242                 }
 243
 244                 public void Transfer (string path, bool preserveForm) {
 245                         Execute (path, null, preserveForm, true);
 246                         context.Response.End ();
 247                 }
 248 #if NET_2_0
 249                 public void Transfer (IHttpHandler handler, bool preserveForm)
 250                 {
 251                         if (handler == null)
 252                                 throw new ArgumentNullException ("handler");
 253
 254                         // TODO: see the MS doc and search for "enableViewStateMac": this method is not
 255                         // allowed for pages when preserveForm is true and the page IsCallback property
 256                         // is true.
 257                         Execute (handler, null, preserveForm, context.Request.CurrentExecutionFilePath, null, true, true);
 258                         context.Response.End ();
 259                 }
 260
 261                 public void Execute (IHttpHandler handler, TextWriter writer, bool preserveForm)
 262                 {
 263                         if (handler == null)
 264                                 throw new ArgumentNullException ("handler");
 265
 266                         Execute (handler, writer, preserveForm, context.Request.CurrentExecutionFilePath, null, false, true);
 267                 }
 268
 269                 public static byte[] UrlTokenDecode (string input)
 270                 {
 271                         if (input == null)
 272                                 throw new ArgumentNullException ("input");
 273                         if (input.Length < 1)
 274                                 return new byte[0];
 275                         byte[] bytes = Encoding.ASCII.GetBytes (input);
 276                         int inputLength = input.Length - 1;
 277                         int equalsCount = (int)(((char)bytes[inputLength]) - 0x30);
 278                         char[] ret = new char[inputLength + equalsCount];
 279                         int i = 0;
 280                         for (; i < inputLength; i++) {
 281                                 switch ((char)bytes[i]) {
 282                                         case '-':
 283                                                 ret[i] = '+';
 284                                                 break;
 285
 286                                         case '_':
 287                                                 ret[i] = '/';
 288                                                 break;
 289
 290                                         default:
 291                                                 ret[i] = (char)bytes[i];
 292                                                 break;
 293                                 }
 294                         }
 295                         while (equalsCount > 0) {
 296                                 ret[i++] = '=';
 297                                 equalsCount--;
 298                         }
 299
 300                         return Convert.FromBase64CharArray (ret, 0, ret.Length);
 301                 }
 302
 303                 public static string UrlTokenEncode (byte[] input)
 304                 {
 305                         if (input == null)
 306                                 throw new ArgumentNullException ("input");
 307                         if (input.Length < 1)
 308                                 return String.Empty;
 309                         string base64 = Convert.ToBase64String (input);
 310                         int retlen;
 311                         if (base64 == null || (retlen = base64.Length) == 0)
 312                                 return String.Empty;
 313
 314                         // MS.NET implementation seems to process the base64
 315                         // string before returning. It replaces the chars:
 316                         //
 317                         //  + with -
 318                         //  / with _
 319                         //
 320                         // Then removes trailing ==, which may appear in the
 321                         // base64 string, and replaces them with a single digit
 322                         // that's the count of removed '=' characters (0 if none
 323                         // were removed)
 324                         int equalsCount = 0x30;
 325                         while (retlen > 0 && base64[retlen - 1] == '=') {
 326                                 equalsCount++;
 327                                 retlen--;
 328                         }
 329                         char[] chars = new char[retlen + 1];
 330                         chars[retlen] = (char)equalsCount;
 331                         for (int i = 0; i < retlen; i++) {
 332                                 switch (base64[i]) {
 333                                         case '+':
 334                                                 chars[i] = '-';
 335                                                 break;
 336
 337                                         case '/':
 338                                                 chars[i] = '_';
 339                                                 break;
 340
 341                                         default:
 342                                                 chars[i] = base64[i];
 343                                                 break;
 344                                 }
 345                         }
 346                         return new string (chars);
 347                 }
 348 #endif
 349
 350                 public string UrlDecode (string s)
 351                 {
 352                         HttpRequest request = context.Request;
 353                         if(request != null)
 354                                 return HttpUtility.UrlDecode (s, request.ContentEncoding);
 355                         else
 356                                 return HttpUtility.UrlDecode (s);
 357                 }
 358
 359                 public void UrlDecode (string s, TextWriter output)
 360                 {
 361                         if (s != null)
 362                                 output.Write (UrlDecode (s));
 363                 }
 364
 365                 public string UrlEncode (string s)
 366                 {
 367                         HttpResponse response = context.Response;
 368                         if (response != null)
 369                                 return HttpUtility.UrlEncode (s, response.ContentEncoding);
 370                         else
 371                                 return HttpUtility.UrlEncode (s);
 372                 }
 373
 374                 public void UrlEncode (string s, TextWriter output)
 375                 {
 376                         if (s != null)
 377                                 output.Write (UrlEncode (s));
 378                 }
 379
 380                 public string UrlPathEncode (string s)
 381                 {
 382                         if (s == null)
 383                                 return null;
 384
 385                         int idx = s.IndexOf ('?');
 386                         string s2 = null;
 387                         if (idx != -1) {
 388                                 s2 = s.Substring (0, idx);
 389                                 s2 = HttpUtility.UrlEncode (s2) + s.Substring (idx);
 390                         } else {
 391                                 s2 = HttpUtility.UrlEncode (s);
 392                         }
 393
 394                         return s2;
 395                 }
 396
 397                 public string MachineName {
 398                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 399                         // Medium doesn't look heavy enough to replace this... reported as
 400                         [SecurityPermission (SecurityAction.Assert, UnmanagedCode = true)]
 401                         [EnvironmentPermission (SecurityAction.Assert, Read = "COMPUTERNAME")]
 402                         get { return Environment.MachineName; }
 403                 }
 404
 405                 public int ScriptTimeout {
 406                         get { return (int) context.ConfigTimeout.TotalSeconds; }
 407                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 408                         set { context.ConfigTimeout = TimeSpan.FromSeconds (value); }
 409                 }
 410         }
 411 }