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

   1 //
   2 // System.Security.Policy.ZoneMembershipCondition.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2003, Ximian Inc.
   9 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Globalization;
  33
  34 namespace System.Security.Policy {
  35
  36         [Serializable]
  37         public sealed class ZoneMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  38
  39                 private readonly int version = 1;
  40
  41                 private SecurityZone zone;
  42
  43                 // so System.Activator.CreateInstance can create an instance...
  44                 internal ZoneMembershipCondition ()
  45                 {
  46                 }
  47
  48                 public ZoneMembershipCondition (SecurityZone zone)
  49                 {
  50                         // we need the validations
  51                         SecurityZone = zone;
  52                 }
  53
  54                 public SecurityZone SecurityZone {
  55                         get { return zone; }
  56                         set {
  57                                 if (!Enum.IsDefined (typeof (SecurityZone), value)) {
  58                                         throw new ArgumentException (Locale.GetText (
  59                                                 "invalid zone"));
  60                                 }
  61                                 if (value == SecurityZone.NoZone) {
  62                                         throw new ArgumentException (Locale.GetText (
  63                                                 "NoZone isn't valid for membership condition"));
  64                                 }
  65
  66                                 zone = value;
  67                         }
  68                 }
  69
  70                 public bool Check (Evidence evidence)
  71                 {
  72                         if (evidence == null)
  73                                 return false;
  74
  75                         IEnumerator e = evidence.GetHostEnumerator ();
  76                         while (e.MoveNext ()) {
  77                                 Zone z = (e.Current as Zone);
  78                                 if (z != null) {
  79                                         if (z.SecurityZone == zone)
  80                                                 return true;
  81                                 }
  82                         }
  83                         return false;
  84                 }
  85
  86                 public IMembershipCondition Copy ()
  87                 {
  88                         return new ZoneMembershipCondition (zone);
  89                 }
  90
  91                 public override bool Equals (Object o)
  92                 {
  93                         if (o is ZoneMembershipCondition == false)
  94                                 return false;
  95                         else
  96                                 return ((ZoneMembershipCondition) o).SecurityZone == zone;
  97                 }
  98
  99                 public void FromXml (SecurityElement element)
 100                 {
 101                         FromXml (element, null);
 102                 }
 103
 104                 public void FromXml (SecurityElement element, PolicyLevel level)
 105                 {
 106                         MembershipConditionHelper.CheckSecurityElement (element, "element", version, version);
 107
 108                         string z = element.Attribute ("Zone");
 109                         if (z != null) {
 110                                 zone = (SecurityZone) Enum.Parse (typeof (SecurityZone), z);
 111                         }
 112                 }
 113
 114                 public override int GetHashCode ()
 115                 {
 116                         return zone.GetHashCode ();
 117                 }
 118
 119                 public override string ToString ()
 120                 {
 121                         return "Zone - " + zone;
 122                 }
 123
 124                 public SecurityElement ToXml ()
 125                 {
 126                         return ToXml (null);
 127                 }
 128
 129                 public SecurityElement ToXml (PolicyLevel level)
 130                 {
 131                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 132                         SecurityElement se = MembershipConditionHelper.Element (typeof (ZoneMembershipCondition), version);
 133                         se.AddAttribute ("Zone", zone.ToString ());
 134                         return se;
 135                 }
 136         }
 137 }