mcs/class/System.Web/System.Web/VirtualPathUtility.cs

   1 //
   2 // System.Web.VirtualPathUtility.cs
   3 //
   4 // Author:
   5 //      Chris Toshok (toshok@ximian.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //
   8
   9 //
  10 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
  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
  33 using System.Web.Util;
  34 using System.Text;
  35
  36 namespace System.Web {
  37
  38 #if NET_2_0
  39         public
  40 #endif
  41         static class VirtualPathUtility
  42         {
  43                 public static string AppendTrailingSlash (string virtualPath)
  44                 {
  45                         if (virtualPath == null)
  46                                 return virtualPath;
  47
  48                         int length = virtualPath.Length;
  49                         if (length == 0 || virtualPath [length - 1] == '/')
  50                                 return virtualPath;
  51
  52                         return virtualPath + "/";
  53                 }
  54
  55                 public static string Combine (string basePath, string relativePath)
  56                 {
  57                         basePath = Normalize (basePath);
  58
  59                         if (IsRooted (relativePath))
  60                                 return Normalize (relativePath);
  61
  62                         if (basePath [basePath.Length - 1] != '/') {
  63                                 if (basePath.Length > 1) {
  64                                         int lastSlash = basePath.LastIndexOf ('/');
  65                                         if (lastSlash >= 0)
  66                                                 basePath = basePath.Substring (0, lastSlash + 1);
  67                                 }
  68                                 else { // "~" only
  69                                         basePath += "/";
  70                                 }
  71                         }
  72
  73                         return Normalize (basePath + relativePath);
  74                 }
  75
  76                 public static string GetDirectory (string virtualPath)
  77                 {
  78                         return GetDirectory (virtualPath, true);
  79                 }
  80
  81                 internal static string GetDirectory (string virtualPath, bool normalize)
  82                 {
  83                         if (normalize)
  84                                 virtualPath = Normalize (virtualPath);
  85
  86                         if (IsAppRelative (virtualPath) && virtualPath.Length < 3) { // "~" or "~/"
  87                                 virtualPath = ToAbsolute (virtualPath);
  88                         }
  89
  90                         if (virtualPath.Length == 1 && virtualPath [0] == '/') { // "/"
  91                                 return null;
  92                         }
  93
  94                         int last = virtualPath.LastIndexOf ('/', virtualPath.Length - 2, virtualPath.Length - 2);
  95                         if (last > 0)
  96                                 return virtualPath.Substring (0, last + 1);
  97                         else
  98                                 return "/";
  99                 }
 100
 101                 public static string GetExtension (string virtualPath)
 102                 {
 103                         if (StrUtils.IsNullOrEmpty (virtualPath))
 104                                 throw new ArgumentNullException ("virtualPath");
 105
 106                         virtualPath = Canonize (virtualPath);
 107
 108                         int dot = virtualPath.LastIndexOf ('.');
 109                         if (dot == -1 || dot == virtualPath.Length - 1 || dot < virtualPath.LastIndexOf ('/'))
 110                                 return String.Empty;
 111
 112                         return virtualPath.Substring (dot);
 113                 }
 114
 115                 public static string GetFileName (string virtualPath)
 116                 {
 117                         virtualPath = Normalize (virtualPath);
 118
 119                         if (IsAppRelative (virtualPath) && virtualPath.Length < 3) { // "~" or "~/"
 120                                 virtualPath = ToAbsolute (virtualPath);
 121                         }
 122
 123                         if (virtualPath.Length == 1 && virtualPath [0] == '/') { // "/"
 124                                 return String.Empty;
 125                         }
 126
 127                         virtualPath = RemoveTrailingSlash (virtualPath);
 128                         int last = virtualPath.LastIndexOf ('/');
 129                         return virtualPath.Substring (last + 1);
 130                 }
 131
 132                 internal static bool IsRooted (string virtualPath)
 133                 {
 134                         return IsAbsolute (virtualPath) || IsAppRelative (virtualPath);
 135                 }
 136
 137                 public static bool IsAbsolute (string virtualPath)
 138                 {
 139                         if (StrUtils.IsNullOrEmpty (virtualPath))
 140                                 throw new ArgumentNullException ("virtualPath");
 141
 142                         return (virtualPath [0] == '/' || virtualPath [0] == '\\');
 143                 }
 144
 145                 public static bool IsAppRelative (string virtualPath)
 146                 {
 147                         if (StrUtils.IsNullOrEmpty (virtualPath))
 148                                 throw new ArgumentNullException ("virtualPath");
 149
 150                         if (virtualPath.Length == 1 && virtualPath [0] == '~')
 151                                 return true;
 152
 153                         if (virtualPath [0] == '~' && (virtualPath [1] == '/' || virtualPath [1] == '\\'))
 154                                 return true;
 155
 156                         return false;
 157                 }
 158
 159                 // MSDN: If the fromPath and toPath parameters are not rooted; that is,
 160                 // they do not equal the root operator (the tilde [~]), do not start with a tilde (~),
 161                 // such as a tilde and a slash mark (~/) or a tilde and a double backslash (~//),
 162                 // or do not start with a slash mark (/), an ArgumentException exception is thrown.
 163                 public static string MakeRelative (string fromPath, string toPath)
 164                 {
 165                         if (fromPath == null || toPath == null)
 166                                 throw new NullReferenceException (); // yeah!
 167
 168                         if (toPath == "")
 169                                 return toPath;
 170
 171                         toPath = ToAbsoluteInternal (toPath);
 172                         fromPath = ToAbsoluteInternal (fromPath);
 173
 174                         if (String.CompareOrdinal (fromPath, toPath) == 0 && fromPath [fromPath.Length - 1] == '/')
 175                                 return "./";
 176
 177                         string [] toPath_parts = toPath.Split ('/');
 178                         string [] fromPath_parts = fromPath.Split ('/');
 179                         int dest = 1;
 180                         while (toPath_parts [dest] == fromPath_parts [dest]) {
 181                                 if (toPath_parts.Length == (dest + 1) || fromPath_parts.Length == (dest + 1)) {
 182                                         break;
 183                                 }
 184                                 dest++;
 185                         }
 186                         StringBuilder res = new StringBuilder();
 187                         for (int i = 1; i < fromPath_parts.Length - dest; i++) {
 188                                 res.Append ("../");
 189                         }
 190                         for (int i = dest; i < toPath_parts.Length; i++) {
 191                                 res.Append (toPath_parts [i]);
 192                                 if (i < toPath_parts.Length - 1)
 193                                         res.Append ('/');
 194                         }
 195                         return res.ToString ();
 196                 }
 197
 198                 private static string ToAbsoluteInternal (string virtualPath)
 199                 {
 200                         if (IsAppRelative (virtualPath))
 201                                 return ToAbsolute (virtualPath, HttpRuntime.AppDomainAppVirtualPath);
 202                         else if (IsAbsolute (virtualPath))
 203                                 return Normalize (virtualPath);
 204
 205                         throw new ArgumentOutOfRangeException ("Specified argument was out of the range of valid values.");
 206                 }
 207
 208                 public static string RemoveTrailingSlash (string virtualPath)
 209                 {
 210                         if (virtualPath == null || virtualPath == "")
 211                                 return null;
 212
 213                         int last = virtualPath.Length - 1;
 214                         if (last == 0 || virtualPath [last] != '/')
 215                                 return virtualPath;
 216
 217                         return virtualPath.Substring (0, last);
 218                 }
 219
 220                 public static string ToAbsolute (string virtualPath)
 221                 {
 222                         return ToAbsolute (virtualPath, true);
 223                 }
 224
 225                 internal static string ToAbsolute (string virtualPath, bool normalize)
 226                 {
 227                         if (IsAbsolute (virtualPath)) {
 228                                 if (normalize)
 229                                         return Normalize (virtualPath);
 230                                 else
 231                                         return virtualPath;
 232                         }
 233
 234                         string apppath = HttpRuntime.AppDomainAppVirtualPath;
 235                         if (apppath == null)
 236                                 throw new HttpException ("The path to the application is not known");
 237
 238                         if (virtualPath.Length == 1 && virtualPath [0] == '~')
 239                                 return apppath;
 240
 241                         return ToAbsolute (virtualPath,apppath);
 242                 }
 243
 244                 // If virtualPath is:
 245                 // Absolute, the ToAbsolute method returns the virtual path with no changes.
 246                 // Application relative, the ToAbsolute method adds applicationPath to the beginning of the virtual path.
 247                 // Not rooted, the ToAbsolute method raises an ArgumentOutOfRangeException exception.
 248                 public static string ToAbsolute (string virtualPath, string applicationPath)
 249                 {
 250                         return ToAbsolute (virtualPath, applicationPath, true);
 251                 }
 252
 253                 public static string ToAbsolute (string virtualPath, string applicationPath, bool normalize)
 254                 {
 255                         if (StrUtils.IsNullOrEmpty (applicationPath))
 256                                 throw new ArgumentNullException ("applicationPath");
 257
 258                         if (StrUtils.IsNullOrEmpty (virtualPath))
 259                                 throw new ArgumentNullException ("virtualPath");
 260
 261                         if (IsAppRelative(virtualPath)) {
 262                                 if (applicationPath [0] != '/')
 263                                         throw new ArgumentException ("appPath is not rooted", "applicationPath");
 264
 265                                 string path = applicationPath + (virtualPath.Length == 1 ? "/" : virtualPath.Substring (1));
 266                                 if (normalize)
 267                                         return Normalize (path);
 268                                 else
 269                                         return path;
 270                         }
 271
 272                         if (virtualPath [0] != '/')
 273                                 throw new ArgumentException (String.Format ("Relative path not allowed: '{0}'", virtualPath));
 274
 275                         if (normalize)
 276                                 return Normalize (virtualPath);
 277                         else
 278                                 return virtualPath;
 279
 280                 }
 281
 282                 public static string ToAppRelative (string virtualPath)
 283                 {
 284                         string apppath = HttpRuntime.AppDomainAppVirtualPath;
 285                         if (apppath == null)
 286                                 throw new HttpException ("The path to the application is not known");
 287
 288                         return ToAppRelative (virtualPath, apppath);
 289                 }
 290
 291                 public static string ToAppRelative (string virtualPath, string applicationPath)
 292                 {
 293 #if DEBUG
 294                         Console.WriteLine ("VirtualPathUtility.ToAppRelative (\"{0}\", \"{1}\")", virtualPath, applicationPath);
 295 #endif
 296                         virtualPath = Normalize (virtualPath);
 297 #if DEBUG
 298                         Console.WriteLine ("\tvirtualPath (normalized): {0}", virtualPath);
 299 #endif
 300                         if (IsAppRelative (virtualPath))
 301                                 return virtualPath;
 302
 303                         if (!IsAbsolute (applicationPath))
 304                                 throw new ArgumentException ("appPath is not absolute", "applicationPath");
 305
 306                         applicationPath = Normalize (applicationPath);
 307
 308                         if (applicationPath.Length == 1)
 309                                 return "~" + virtualPath;
 310
 311                         int appPath_lenght = applicationPath.Length;
 312                         if (String.CompareOrdinal (virtualPath, applicationPath) == 0)
 313                                 return "~/";
 314                         if (String.CompareOrdinal (virtualPath, 0, applicationPath, 0, appPath_lenght) == 0)
 315                                 return "~" + virtualPath.Substring (appPath_lenght);
 316
 317                         return virtualPath;
 318                 }
 319
 320                 static char [] path_sep = { '/' };
 321
 322                 static string Normalize (string path)
 323                 {
 324                         if (!IsRooted (path))
 325                                 throw new ArgumentException (String.Format ("The relative virtual path '{0}' is not allowed here.", path));
 326
 327                         if (path.Length == 1) // '/' or '~'
 328                                 return path;
 329
 330                         path = Canonize (path);
 331
 332                         int dotPos = path.IndexOf ('.');
 333                         while (dotPos >= 0) {
 334                                 if (++dotPos == path.Length)
 335                                         break;
 336
 337                                 char nextChar = path [dotPos];
 338
 339                                 if ((nextChar == '/') || (nextChar == '.'))
 340                                         break;
 341
 342                                 dotPos = path.IndexOf ('.', dotPos);
 343                         }
 344
 345                         if (dotPos < 0)
 346                                 return path;
 347
 348                         bool starts_with_tilda = false;
 349                         bool ends_with_slash = false;
 350                         string [] apppath_parts= null;
 351
 352                         if (path [0] == '~') {
 353                                 if (path.Length == 2) // "~/"
 354                                         return "~/";
 355                                 starts_with_tilda = true;
 356                                 path = path.Substring (1);
 357                         }
 358                         else if (path.Length == 1) { // "/"
 359                                 return "/";
 360                         }
 361
 362                         if (path [path.Length - 1] == '/')
 363                                 ends_with_slash = true;
 364
 365                         string [] parts = StrUtils.SplitRemoveEmptyEntries (path, path_sep);
 366                         int end = parts.Length;
 367
 368                         int dest = 0;
 369
 370                         for (int i = 0; i < end; i++) {
 371                                 string current = parts [i];
 372                                 if (current == ".")
 373                                         continue;
 374
 375                                 if (current == "..") {
 376                                         dest--;
 377
 378                                         if(dest >= 0)
 379                                                 continue;
 380
 381                                         if (starts_with_tilda) {
 382                                                 if (apppath_parts == null) {
 383                                                         string apppath = HttpRuntime.AppDomainAppVirtualPath;
 384                                                         apppath_parts = StrUtils.SplitRemoveEmptyEntries (apppath, path_sep);
 385                                                 }
 386
 387                                                 if ((apppath_parts.Length + dest) >= 0)
 388                                                         continue;
 389                                         }
 390
 391                                         throw new HttpException ("Cannot use a leading .. to exit above the top directory.");
 392                                 }
 393
 394                                 if (dest >= 0)
 395                                         parts [dest] = current;
 396                                 else
 397                                         apppath_parts [apppath_parts.Length + dest] = current;
 398
 399                                 dest++;
 400                         }
 401
 402                         StringBuilder str = new StringBuilder();
 403                         if (apppath_parts != null) {
 404                                 starts_with_tilda = false;
 405                                 int count = apppath_parts.Length;
 406                                 if (dest < 0)
 407                                         count += dest;
 408                                 for (int i = 0; i < count; i++) {
 409                                         str.Append ('/');
 410                                         str.Append (apppath_parts [i]);
 411                                 }
 412                         }
 413                         else if (starts_with_tilda) {
 414                                 str.Append ('~');
 415                         }
 416
 417                         for (int i = 0; i < dest; i++) {
 418                                 str.Append ('/');
 419                                 str.Append (parts [i]);
 420                         }
 421
 422                         if (str.Length > 0) {
 423                                 if (ends_with_slash)
 424                                         str.Append ('/');
 425                         }
 426                         else {
 427                                 return "/";
 428                         }
 429
 430                         return str.ToString ();
 431                 }
 432
 433                 static string Canonize (string path)
 434                 {
 435                         int index = -1;
 436                         for (int i=0; i < path.Length; i++) {
 437                                 if ((path [i] == '\\') || (path [i] == '/' && (i + 1) < path.Length && (path [i + 1] == '/' || path [i + 1] == '\\'))) {
 438                                         index = i;
 439                                         break;
 440                                 }
 441                         }
 442                         if (index < 0)
 443                                 return path;
 444
 445                         StringBuilder sb = new StringBuilder (path.Length);
 446                         sb.Append (path, 0, index);
 447
 448                         for (int i = index; i < path.Length; i++) {
 449                                 if (path [i] == '\\' || path [i] == '/') {
 450                                         int next = i + 1;
 451                                         if (next < path.Length && (path [next] == '\\' || path [next] == '/'))
 452                                                 continue;
 453                                         sb.Append ('/');
 454                                 }
 455                                 else {
 456                                         sb.Append (path [i]);
 457                                 }
 458                         }
 459
 460                         return sb.ToString ();
 461                 }
 462
 463         }
 464 }