mcs/class/System.Web/System.Web/CapabilitiesLoader.cs

   1 //
   2 // System.Web.CapabilitiesLoader
   3 //
   4 // Loads data from browscap.ini file provided by Gary J. Keith from
   5 // http://www.GaryKeith.com/browsers. Please don't abuse the
   6 // site when updating browscap.ini file. Use the update-browscap.exe tool.
   7 //
   8 // Authors:
   9 //   Gonzalo Paniagua Javier (gonzalo@ximian.com)
  10 //
  11 // (c) 2003 Novell, Inc. (http://www.novell.com)
  12 //
  13
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System;
  36 using System.Collections;
  37 using System.Collections.Specialized;
  38 using System.Globalization;
  39 using System.IO;
  40 using System.Text.RegularExpressions;
  41 using System.Web.Configuration;
  42
  43 namespace System.Web
  44 {
  45         class BrowserData
  46         {
  47                 static char [] wildchars = new char [] {'*', '?'};
  48                 BrowserData parent;
  49                 string text;
  50                 string pattern;
  51                 Regex regex;
  52                 ListDictionary data;
  53
  54                 public BrowserData (string pattern)
  55                 {
  56                         int norx = pattern.IndexOfAny (wildchars);
  57                         if (norx == -1) {
  58                                 text = pattern;
  59                         } else {
  60                                 this.pattern = pattern.Substring (norx);
  61                                 text = pattern.Substring (0, norx);
  62                                 if (text.Length == 0)
  63                                         text = null;
  64
  65                                 this.pattern = this.pattern.Replace (".", "\\.");
  66                                 this.pattern = this.pattern.Replace ("(", "\\(");
  67                                 this.pattern = this.pattern.Replace (")", "\\)");
  68                                 this.pattern = this.pattern.Replace ("[", "\\[");
  69                                 this.pattern = this.pattern.Replace ("]", "\\]");
  70                                 this.pattern = this.pattern.Replace ("?", ".");
  71                                 this.pattern = this.pattern.Replace ("*", ".*");
  72                         }
  73                 }
  74
  75                 public BrowserData Parent {
  76                         get { return parent; }
  77                         set { parent = value; }
  78                 }
  79
  80                 public void Add (string key, string value)
  81                 {
  82                         if (data == null)
  83                                 data = new ListDictionary ();
  84
  85                         data.Add (key, value);
  86                 }
  87
  88                 public Hashtable GetProperties (Hashtable tbl)
  89                 {
  90                         if (parent != null)
  91                                 parent.GetProperties (tbl);
  92
  93                         foreach (string key in data.Keys)
  94                                 tbl [key] = data [key];
  95
  96                         return tbl;
  97                 }
  98
  99                 public string GetParentName ()
 100                 {
 101                         return (string) data ["parent"];
 102                 }
 103
 104                 public string GetAlternateBrowser ()
 105                 {
 106                         return (pattern == null) ? text : null;
 107                 }
 108
 109                 public string GetBrowser ()
 110                 {
 111                         if (pattern == null)
 112                                 return text;
 113
 114                         return (string) data ["browser"];
 115                 }
 116
 117                 public bool IsMatch (string expression)
 118                 {
 119                         if (expression == null || expression.Length == 0)
 120                                 return false;
 121
 122                         if (text != null) {
 123                                 if (text [0] != expression [0] ||
 124                                     String.Compare (text, 1, expression, 1,
 125                                                     text.Length - 1, false,
 126                                                     CultureInfo.InvariantCulture) != 0) {
 127                                         return false;
 128                                 }
 129                                 expression = expression.Substring (text.Length);
 130                         }
 131
 132                         if (pattern == null)
 133                                 return expression.Length == 0;
 134
 135                         lock (this) {
 136                                 if (regex == null)
 137                                         regex = new Regex (pattern);
 138                         }
 139
 140                         return regex.Match (expression).Success;
 141                 }
 142         }
 143
 144         class CapabilitiesLoader : MarshalByRefObject
 145         {
 146                 static volatile bool loaded;
 147                 static ICollection alldata;
 148                 static Hashtable defaultCaps;
 149                 static readonly object lockobj = new object ();
 150                 private CapabilitiesLoader () {}
 151
 152                 static CapabilitiesLoader ()
 153                 {
 154                         defaultCaps = new Hashtable ();
 155                         defaultCaps.Add ("frames", "True");
 156                         defaultCaps.Add ("tables", "True");
 157                 }
 158
 159                 public static Hashtable GetCapabilities (string userAgent)
 160                 {
 161                         Init ();
 162                         if (userAgent != null)
 163                                 userAgent = userAgent.Trim ();
 164
 165                         if (alldata == null || userAgent == null || userAgent == "")
 166                                 return defaultCaps;
 167
 168                         foreach (BrowserData bd in alldata) {
 169                                 if (bd.IsMatch (userAgent))
 170                                         return bd.GetProperties (new Hashtable ());
 171                         }
 172
 173                         return defaultCaps;
 174                 }
 175
 176                 static void Init ()
 177                 {
 178                         if (loaded)
 179                                 return;
 180
 181                         lock (lockobj) {
 182                                 if (loaded)
 183                                         return;
 184 #if TARGET_J2EE
 185                                 string filepath = "browscap.ini";
 186 #else
 187 #if NET_2_0
 188                                 string dir = Path.GetDirectoryName (WebConfigurationManager.OpenMachineConfiguration().FilePath);
 189 #else
 190                                 string dir = Path.GetDirectoryName (WebConfigurationSettings.MachineConfigPath);
 191 #endif
 192                                 string filepath = Path.Combine (dir, "browscap.ini");
 193                                 if (!File.Exists (filepath)) {
 194                                         // try removing the trailing version directory
 195                                         dir = Path.GetDirectoryName (dir);
 196                                         filepath = Path.Combine (dir, "browscap.ini");
 197                                 }
 198 #endif
 199                                 try {
 200                                         LoadFile (filepath);
 201                                 } catch (Exception) { }
 202
 203                                 loaded = true;
 204                         }
 205                 }
 206
 207 #if TARGET_J2EE
 208                 private static TextReader GetJavaTextReader(string filename)
 209                 {
 210                         Stream s;
 211                         try
 212                         {
 213                                 java.lang.ClassLoader cl = (java.lang.ClassLoader)
 214                                         AppDomain.CurrentDomain.GetData("GH_ContextClassLoader");
 215                                 if (cl == null)
 216                                         return null;
 217
 218                                 string custom = String.Concat("browscap/", filename);
 219
 220                                 java.io.InputStream inputStream = cl.getResourceAsStream(custom);
 221                                 if (inputStream == null)
 222                                         inputStream = cl.getResourceAsStream(filename);
 223
 224                                 s = (Stream)vmw.common.IOUtils.getStream(inputStream);
 225                         }
 226                         catch (Exception e)
 227                         {
 228                                 return null;
 229                         }
 230                         return new StreamReader (s);
 231                 }
 232 #endif
 233
 234                 static void LoadFile (string filename)
 235                 {
 236 #if TARGET_J2EE
 237                         TextReader input = GetJavaTextReader(filename);
 238                         if(input == null)
 239                                 return;
 240 #else
 241                         if (!File.Exists (filename))
 242                                 return;
 243
 244                         TextReader input = new StreamReader (File.OpenRead (filename));
 245 #endif
 246                         string str;
 247                         Hashtable allhash = new Hashtable ();
 248                         int aux = 0;
 249                         while ((str = input.ReadLine ()) != null) {
 250                                 if (str.Length == 0 || str [0] == ';')
 251                                         continue;
 252
 253                                 string userAgent = str.Substring (1, str.Length - 2);
 254                                 BrowserData data = new BrowserData (userAgent);
 255                                 ReadCapabilities (input, data);
 256
 257                                 /* Ignore default browser and file version information */
 258                                 if (userAgent == "*" || userAgent == "GJK_Browscap_Version")
 259                                         continue;
 260
 261                                 string key = data.GetBrowser ();
 262                                 if (key == null || allhash.ContainsKey (key)) {
 263                                         allhash.Add (aux++, data);
 264                                 } else {
 265                                         allhash.Add (key, data);
 266                                 }
 267                         }
 268
 269                         alldata = allhash.Values;
 270                         foreach (BrowserData data in alldata) {
 271                                 if (data.Parent != null)
 272                                         continue;
 273
 274                                 string pname = data.GetParentName ();
 275                                 if (pname != null)
 276                                         data.Parent = (BrowserData) allhash [pname];
 277                         }
 278                 }
 279
 280                 static char [] eq = new char []{'='};
 281                 static void ReadCapabilities (TextReader input, BrowserData data)
 282                 {
 283                         string str;
 284                         while ((str = input.ReadLine ()) != null && str.Length != 0) {
 285                                 string [] keyvalue = str.Split (eq, 2);
 286                                 data.Add (keyvalue [0], keyvalue [1]);
 287                         }
 288                 }
 289         }
 290 }
 291