mcs/class/System.Web/System.Web.Util/UrlUtils.cs

   1 //
   2 // System.Web.UrlUtils.cs
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua (gonzalo@ximian.com)
   6 //      Jackson Harper   (jackson@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 using System.Web.SessionState;
  33 using System.Text;
  34 namespace System.Web.Util {
  35
  36 #if VISUAL_STUDIO
  37         public
  38 #else
  39         internal
  40 #endif
  41         class UrlUtils {
  42
  43                 // appRoot + SessionID + vpath
  44                 public static string InsertSessionId (string id, string path)
  45                 {
  46                         string dir = GetDirectory (path);
  47                         if (!dir.EndsWith ("/"))
  48                                 dir += "/";
  49
  50                         string appvpath = HttpRuntime.AppDomainAppVirtualPath;
  51                         if (!appvpath.EndsWith ("/"))
  52                                 appvpath += "/";
  53
  54                         if (path.StartsWith (appvpath))
  55                                 path = path.Substring (appvpath.Length);
  56
  57                         if (path.StartsWith("/"))
  58                                 path = path.Length > 1 ? path.Substring (1) : "";
  59
  60                         return Canonic (appvpath + "(" + id + ")/" + path);
  61                 }
  62
  63                 public static string GetSessionId (string path)
  64                 {
  65 #if TARGET_DOTNET
  66                         return null;
  67 #else
  68                         if (path == null)
  69                                 return null;
  70
  71                         string appvpath = HttpRuntime.AppDomainAppVirtualPath;
  72                         int appvpathlen = appvpath.Length;
  73
  74                         if (path.Length <= appvpathlen)
  75                                 return null;
  76
  77                         path = path.Substring (appvpathlen);
  78
  79                         int len = path.Length;
  80                         if (len == 0 || path [0] != '/') {
  81                                 path = '/' + path;
  82                                 len++;
  83                         }
  84
  85                         if ((len < SessionId.IdLength + 3) || (path [1] != '(') ||
  86                             (path [SessionId.IdLength + 2] != ')'))
  87                                 return null;
  88
  89                         return path.Substring (2, SessionId.IdLength);
  90 #endif
  91                 }
  92
  93                 public static bool HasSessionId (string path)
  94                 {
  95                         if (path == null || path.Length < 5)
  96                                 return false;
  97
  98                         return (StrUtils.StartsWith (path, "/(") && path.IndexOf (")/") > 2);
  99                 }
 100
 101                 public static string RemoveSessionId (string base_path, string file_path)
 102                 {
 103                         // Caller did a GetSessionId first
 104                         int idx = base_path.IndexOf ("/(");
 105                         string dir = base_path.Substring (0, idx + 1);
 106                         if (!dir.EndsWith ("/"))
 107                                 dir += "/";
 108
 109                         idx = base_path.IndexOf (")/");
 110                         if (idx != -1 && base_path.Length > idx + 2) {
 111                                 string dir2 = base_path.Substring (idx + 2);
 112                                 if (!dir2.EndsWith ("/"))
 113                                         dir2 += "/";
 114
 115                                 dir += dir2;
 116                         }
 117
 118                         return Canonic (dir + GetFile (file_path));
 119                 }
 120
 121                 public static string Combine (string basePath, string relPath)
 122                 {
 123                         if (relPath == null)
 124                                 throw new ArgumentNullException ("relPath");
 125
 126                         int rlength = relPath.Length;
 127                         if (rlength == 0)
 128                                 return "";
 129
 130                         relPath = relPath.Replace ('\\', '/');
 131                         if (IsRooted (relPath))
 132                                 return Canonic (relPath);
 133
 134                         char first = relPath [0];
 135                         if (rlength < 3 || first == '~' || first == '/' || first == '\\') {
 136                                 if (basePath == null || (basePath.Length == 1 && basePath [0] == '/'))
 137                                         basePath = String.Empty;
 138
 139                                 string slash = (first == '/') ? "" : "/";
 140                                 if (first == '~') {
 141                                         if (rlength == 1) {
 142                                                 relPath = "";
 143                                         } else if (rlength > 1 && relPath [1] == '/') {
 144                                                 relPath = relPath.Substring (2);
 145                                                 slash = "/";
 146                                         }
 147
 148                                         string appvpath = HttpRuntime.AppDomainAppVirtualPath;
 149                                         if (appvpath.EndsWith ("/"))
 150                                                 slash = "";
 151
 152                                         return Canonic (appvpath + slash + relPath);
 153                                 }
 154
 155                                 return Canonic (basePath + slash + relPath);
 156                         }
 157
 158                         if (basePath == null || basePath.Length == 0 || basePath [0] == '~')
 159                                 basePath = HttpRuntime.AppDomainAppVirtualPath;
 160
 161                         if (basePath.Length <= 1)
 162                                 basePath = String.Empty;
 163
 164                         return Canonic (basePath + "/" + relPath);
 165                 }
 166
 167                 static char [] path_sep = {'\\', '/'};
 168
 169                 public static string Canonic (string path)
 170                 {
 171                         bool isRooted = IsRooted(path);
 172                         bool endsWithSlash = path.EndsWith("/");
 173                         string [] parts = path.Split (path_sep);
 174                         int end = parts.Length;
 175
 176                         int dest = 0;
 177
 178                         for (int i = 0; i < end; i++) {
 179                                 string current = parts [i];
 180
 181                                 if (current.Length == 0)
 182                                         continue;
 183
 184                                 if (current == "." )
 185                                         continue;
 186
 187                                 if (current == "..") {
 188                                         dest --;
 189                                         continue;
 190                                 }
 191                                 if (dest < 0)
 192                                         if (!isRooted)
 193                                                 throw new HttpException ("Invalid path.");
 194                                         else
 195                                                 dest = 0;
 196
 197                                 parts [dest++] = current;
 198                         }
 199                         if (dest < 0)
 200                                 throw new HttpException ("Invalid path.");
 201
 202                         if (dest == 0)
 203                                 return "/";
 204
 205                         string str = String.Join ("/", parts, 0, dest);
 206                         str = RemoveDoubleSlashes (str);
 207                         if (isRooted)
 208                                 str = "/" + str;
 209                         if (endsWithSlash)
 210                                 str = str + "/";
 211
 212                         return str;
 213                 }
 214
 215                 public static string GetDirectory (string url)
 216                 {
 217                         url = url.Replace('\\','/');
 218                         int last = url.LastIndexOf ('/');
 219
 220                         if (last > 0) {
 221                                 if (last < url.Length)
 222                                         last++;
 223                                 return RemoveDoubleSlashes (url.Substring (0, last));
 224                         }
 225
 226                         return "/";
 227                 }
 228
 229                 public static string RemoveDoubleSlashes (string input)
 230                 {
 231                         // MS VirtualPathUtility removes duplicate '/'
 232
 233                         int index = -1;
 234                         for (int i = 1; i < input.Length; i++)
 235                                 if (input [i] == '/' && input [i - 1] == '/') {
 236                                         index = i - 1;
 237                                         break;
 238                                 }
 239
 240                         if (index == -1) // common case optimization
 241                                 return input;
 242
 243                         StringBuilder sb = new StringBuilder (input.Length);
 244                         sb.Append (input, 0, index);
 245
 246                         for (int i = index; i < input.Length; i++) {
 247                                 if (input [i] == '/') {
 248                                         int next = i + 1;
 249                                         if (next < input.Length && input [next] == '/')
 250                                                 continue;
 251                                         sb.Append ('/');
 252                                 }
 253                                 else {
 254                                         sb.Append (input [i]);
 255                                 }
 256                         }
 257
 258                         return sb.ToString ();
 259                 }
 260
 261                 public static string GetFile (string url)
 262                 {
 263                         url = url.Replace('\\','/');
 264                         int last = url.LastIndexOf ('/');
 265                         if (last >= 0) {
 266                                 if (url.Length == 1) // Empty file name instead of ArgumentOutOfRange
 267                                         return "";
 268                                 return url.Substring (last+1);
 269                         }
 270
 271                         throw new ArgumentException (String.Format ("GetFile: `{0}' does not contain a /", url));
 272                 }
 273
 274                 public static bool IsRooted (string path)
 275                 {
 276                         if (path == null || path.Length == 0)
 277                                 return true;
 278
 279                         char c = path [0];
 280                         if (c == '/' || c == '\\')
 281                                 return true;
 282
 283                         return false;
 284                 }
 285
 286                 public static bool IsRelativeUrl (string path)
 287                 {
 288                         return (path [0] != '/' && path.IndexOf (':') == -1);
 289                 }
 290
 291                 public static string ResolveVirtualPathFromAppAbsolute (string path)
 292                 {
 293                         if (path [0] != '~') return path;
 294
 295                         if (path.Length == 1)
 296                                 return HttpRuntime.AppDomainAppVirtualPath;
 297
 298                         if (path [1] == '/' || path [1] == '\\') {
 299                                 string appPath = HttpRuntime.AppDomainAppVirtualPath;
 300                                 if (appPath.Length > 1)
 301                                         return appPath + "/" + path.Substring (2);
 302                                 return "/" + path.Substring (2);
 303                         }
 304                         return path;
 305                 }
 306
 307                 public static string ResolvePhysicalPathFromAppAbsolute (string path)
 308                 {
 309                         if (path [0] != '~') return path;
 310
 311                         if (path.Length == 1)
 312                                 return HttpRuntime.AppDomainAppPath;
 313
 314                         if (path [1] == '/' || path [1] == '\\') {
 315                                 string appPath = HttpRuntime.AppDomainAppPath;
 316                                 if (appPath.Length > 1)
 317                                         return appPath + "/" + path.Substring (2);
 318                                 return "/" + path.Substring (2);
 319                         }
 320                         return path;
 321                 }
 322         }
 323 }