mcs/class/corlib/System.Security.Policy/UrlMembershipCondition.cs

   1 //
   2 // System.Security.Policy.UrlMembershipCondition.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2003, Ximian Inc.
   9 // (C) 2004 Motus Technologies Inc. (http://www.motus.com)
  10 // Copyright (C) 2004-2005 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.Collections;
  33 using System.Globalization;
  34 using System.Runtime.InteropServices;
  35
  36 using Mono.Security;
  37
  38 namespace System.Security.Policy {
  39
  40         [Serializable]
  41 #if NET_2_0
  42         [ComVisible (true)]
  43 #endif
  44         public sealed class UrlMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  45
  46                 private readonly int version = 1;
  47
  48                 private Url url;
  49                 private string userUrl;
  50
  51                 public UrlMembershipCondition (string url)
  52                 {
  53                         if (url == null)
  54                                 throw new ArgumentNullException ("url");
  55 #if NET_2_0
  56                         CheckUrl (url);
  57                         userUrl = url;
  58                         this.url = new Url (url);
  59 #else
  60                         this.url = new Url (url);
  61                         userUrl = this.url.Value;
  62 #endif
  63                 }
  64
  65                 internal UrlMembershipCondition (Url url, string userUrl)
  66                 {
  67                         // as the Url object has already been validated there's no
  68                         // need to restart the whole process by converting to string
  69                         this.url = (Url) url.Copy ();
  70                         this.userUrl = userUrl;
  71                 }
  72
  73                 // properties
  74
  75                 public string Url {
  76                         get {
  77                                 if (userUrl == null)
  78                                         userUrl = url.Value;
  79                                 return userUrl;
  80                         }
  81                         set { url = new Url (value); }
  82                 }
  83
  84                 // methods
  85
  86                 public bool Check (Evidence evidence)
  87                 {
  88                         if (evidence == null)
  89                                 return false;
  90
  91                         string u = url.Value;
  92                         int wildcard = u.LastIndexOf ("*");     // partial match with a wildcard at the end
  93                         if (wildcard == -1)
  94                                 wildcard = u.Length;            // exact match
  95
  96                         IEnumerator e = evidence.GetHostEnumerator ();
  97                         while (e.MoveNext ()) {
  98                                 if (e.Current is Url) {
  99                                         // note: there shouldn't be more than one Url evidence
 100                                         if (String.Compare (u, 0, (e.Current as Url).Value, 0, wildcard,
 101                                                 true, CultureInfo.InvariantCulture) == 0) {
 102                                                 return true;
 103                                         }
 104                                         // but we must check for all of them!
 105                                 }
 106                         }
 107                         return false;
 108                 }
 109
 110                 public IMembershipCondition Copy ()
 111                 {
 112                         return new UrlMembershipCondition (url, userUrl);
 113                 }
 114
 115                 public override bool Equals (object o)
 116                 {
 117                         UrlMembershipCondition umc = (o as UrlMembershipCondition);
 118                         if (o == null)
 119                                 return false;
 120
 121                         string u = url.Value;
 122                         int length = u.Length; // exact match
 123
 124                         // partial match with a wildcard at the end
 125                         if (u [length - 1] == '*') {
 126                                 length--;
 127                                 // in this case the last / could be ommited
 128                                 if (u [length - 1] == '/')
 129                                         length--;
 130                         }
 131
 132                         return (String.Compare (u, 0, umc.Url, 0, length, true, CultureInfo.InvariantCulture) == 0);
 133                 }
 134
 135                 public void FromXml (SecurityElement element)
 136                 {
 137                         FromXml (element, null);
 138                 }
 139
 140                 public void FromXml (SecurityElement element, PolicyLevel level)
 141                 {
 142                         MembershipConditionHelper.CheckSecurityElement (element, "element", version, version);
 143
 144                         string u = element.Attribute ("Url");
 145 #if NET_2_0
 146                         if (u != null) {
 147                                 CheckUrl (u);
 148                                 url = new Url (u);
 149                         } else {
 150                                 url = null;
 151                         }
 152 #else
 153                         url = (u == null) ? null : new Url (u);
 154 #endif
 155                         userUrl = u;
 156                 }
 157
 158                 public override int GetHashCode ()
 159                 {
 160                         return url.GetHashCode ();
 161                 }
 162
 163                 public override string ToString ()
 164                 {
 165                         return "Url - " + Url;
 166                 }
 167
 168                 public SecurityElement ToXml ()
 169                 {
 170                         return ToXml (null);
 171                 }
 172
 173                 public SecurityElement ToXml (PolicyLevel level)
 174                 {
 175                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 176                         SecurityElement se = MembershipConditionHelper.Element (typeof (UrlMembershipCondition), version);
 177                         se.AddAttribute ("Url", userUrl);
 178                         return se;
 179                 }
 180
 181                 // internal stuff
 182
 183 #if NET_2_0
 184                 internal void CheckUrl (string url)
 185                 {
 186                         // In .NET 1.x Url class checked the validity of the
 187                         // URL but that's no more the case in 2.x - but we
 188                         // still need the check done here
 189                         int protocolPos = url.IndexOf (Uri.SchemeDelimiter);
 190                         string u = (protocolPos < 0) ? "file://" + url : url;
 191
 192                         Uri uri = new Uri (u, false, false);
 193                         // no * except for the "lone star" case
 194                         if (uri.Host.IndexOf ('*') >= 1) {
 195                                 string msg = Locale.GetText ("Invalid * character in url");
 196                                 throw new ArgumentException (msg, "name");
 197                         }
 198                 }
 199 #endif
 200         }
 201 }