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 namespace System.Web.Util {
  34
  35         internal class UrlUtils {
  36
  37                 // appRoot + SessionID + vpath
  38                 internal static string InsertSessionId (string id, string path)
  39                 {
  40                         string dir = GetDirectory (path);
  41                         if (!dir.EndsWith ("/"))
  42                                 dir += "/";
  43
  44                         string appvpath = HttpRuntime.AppDomainAppVirtualPath;
  45                         if (!appvpath.EndsWith ("/"))
  46                                 appvpath += "/";
  47
  48                         if (path.StartsWith (appvpath))
  49                                 path = path.Substring (appvpath.Length);
  50
  51                         if (path [0] == '/')
  52                                 path = path.Length > 1 ? path.Substring (1) : "";
  53
  54                         return Canonic (appvpath + "(" + id + ")/" + path);
  55                 }
  56
  57                 internal static string GetSessionId (string path)
  58                 {
  59                         string appvpath = HttpRuntime.AppDomainAppVirtualPath;
  60                         if (path.Length <= appvpath.Length)
  61                                 return null;
  62
  63                         path = path.Substring (appvpath.Length);
  64                         if (path.Length == 0 || path [0] != '/')
  65                                 path = '/' + path;
  66
  67                         int len = path.Length;
  68                         if ((len < SessionId.IdLength + 3) || (path [1] != '(') ||
  69                             (path [SessionId.IdLength + 2] != ')'))
  70                                 return null;
  71
  72                         return path.Substring (2, SessionId.IdLength);
  73                 }
  74
  75                 internal static string RemoveSessionId (string base_path, string file_path)
  76                 {
  77                         // Caller did a GetSessionId first
  78                         int idx = base_path.IndexOf ("/(");
  79                         string dir = base_path.Substring (0, idx + 1);
  80                         if (!dir.EndsWith ("/"))
  81                                 dir += "/";
  82
  83                         idx = base_path.IndexOf (")/");
  84                         if (idx != -1 && base_path.Length > idx + 2) {
  85                                 string dir2 = base_path.Substring (idx + 2);
  86                                 if (!dir2.EndsWith ("/"))
  87                                         dir2 += "/";
  88
  89                                 dir += dir2;
  90                         }
  91
  92                         return Canonic (dir + GetFile (file_path));
  93                 }
  94
  95                 public static string Combine (string basePath, string relPath)
  96                 {
  97                         if (relPath == null)
  98                                 throw new ArgumentNullException ("relPath");
  99
 100                         int rlength = relPath.Length;
 101                         if (rlength == 0)
 102                                 return "";
 103
 104                         relPath = relPath.Replace ("\\", "/");
 105                         if (IsRooted (relPath))
 106                                 return Canonic (relPath);
 107
 108                         char first = relPath [0];
 109                         if (rlength < 3 || first == '~' || first == '/' || first == '\\') {
 110                                 if (basePath == null || (basePath.Length == 1 && basePath [0] == '/'))
 111                                         basePath = String.Empty;
 112
 113                                 string slash = (first == '/') ? "" : "/";
 114                                 if (first == '~') {
 115                                         if (rlength == 1) {
 116                                                 relPath = "";
 117                                         } else if (rlength > 1 && relPath [1] == '/') {
 118                                                 relPath = relPath.Substring (2);
 119                                                 slash = "/";
 120                                         }
 121
 122                                         string appvpath = HttpRuntime.AppDomainAppVirtualPath;
 123                                         if (appvpath.EndsWith ("/"))
 124                                                 slash = "";
 125
 126                                         return Canonic (appvpath + slash + relPath);
 127                                 }
 128
 129                                 return Canonic (basePath + slash + relPath);
 130                         }
 131
 132                         if (basePath == null || basePath == "" || basePath [0] == '~')
 133                                 basePath = HttpRuntime.AppDomainAppVirtualPath;
 134
 135                         if (basePath.Length <= 1)
 136                                 basePath = String.Empty;
 137
 138                         return Canonic (basePath + "/" + relPath);
 139                 }
 140
 141                 static char [] path_sep = {'\\', '/'};
 142
 143                 internal static string Canonic (string path)
 144                 {
 145                         string [] parts = path.Split (path_sep);
 146                         int end = parts.Length;
 147
 148                         int dest = 0;
 149
 150                         for (int i = 0; i < end; i++) {
 151                                 string current = parts [i];
 152                                 if (current == "." )
 153                                         continue;
 154
 155                                 if (current == "..") {
 156                                         if (dest == 0) {
 157                                                 if (i == 1) // see bug 52599
 158                                                         continue;
 159
 160                                                 throw new HttpException ("Invalid path.");
 161                                         }
 162
 163                                         dest --;
 164                                         continue;
 165                                 }
 166
 167                                 parts [dest++] = current;
 168                         }
 169
 170                         if (dest == 0)
 171                                 return "/";
 172
 173                         return String.Join ("/", parts, 0, dest);
 174                 }
 175
 176                 internal static string GetDirectory (string url)
 177                 {
 178                         url = url.Replace('\\','/');
 179                         int last = url.LastIndexOf ('/');
 180                         if (last > 0)
 181                                 return url.Substring (0, last);
 182                         return "/";
 183                 }
 184
 185                 internal static string GetFile (string url)
 186                 {
 187                         url = url.Replace('\\','/');
 188                         int last = url.LastIndexOf ('/');
 189                         if (last >= 0)
 190                                 return url.Substring (last+1);
 191
 192                         throw new Exception (String.Format ("GetFile: `{0}' does not contain a /", url));
 193                 }
 194
 195                 internal static bool IsRooted (string path)
 196                 {
 197                         if (path == null || path == "")
 198                                 return true;
 199
 200                         char c = path [0];
 201                         if (c == '/' || c == '\\')
 202                                 return true;
 203
 204                         return false;
 205                 }
 206
 207                 internal static bool IsRelativeUrl (string path)
 208                 {
 209                         return (path [0] != '/' && path.IndexOf (':') == -1);
 210                 }
 211
 212                 public static string ResolveVirtualPathFromAppAbsolute (string path)
 213                 {
 214                         if (path [0] != '~') return path;
 215
 216                         if (path.Length == 1)
 217                                 return HttpRuntime.AppDomainAppVirtualPath;
 218
 219                         if (path [1] == '/' || path [1] == '\\') {
 220                                 string appPath = HttpRuntime.AppDomainAppVirtualPath;
 221                                 if (appPath.Length > 1)
 222                                         return appPath + "/" + path.Substring (2);
 223                                 return "/" + path.Substring (2);
 224                         }
 225                         return path;
 226                 }
 227
 228                 public static string ResolvePhysicalPathFromAppAbsolute (string path)
 229                 {
 230                         if (path [0] != '~') return path;
 231
 232                         if (path.Length == 1)
 233                                 return HttpRuntime.AppDomainAppPath;
 234
 235                         if (path [1] == '/' || path [1] == '\\') {
 236                                 string appPath = HttpRuntime.AppDomainAppPath;
 237                                 if (appPath.Length > 1)
 238                                         return appPath + "/" + path.Substring (2);
 239                                 return "/" + path.Substring (2);
 240                         }
 241                         return path;
 242                 }
 243         }
 244 }