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) 2004-2005 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 using System.Runtime.InteropServices;
  34
  35 namespace System.Security.Policy {
  36
  37         [Serializable]
  38         [ComVisible (true)]
  39         public sealed class ZoneMembershipCondition : IMembershipCondition, IConstantMembershipCondition {
  40
  41                 private readonly int version = 1;
  42
  43                 private SecurityZone zone;
  44
  45                 // so System.Activator.CreateInstance can create an instance...
  46                 internal ZoneMembershipCondition ()
  47                 {
  48                 }
  49
  50                 public ZoneMembershipCondition (SecurityZone zone)
  51                 {
  52                         // we need the validations
  53                         SecurityZone = zone;
  54                 }
  55
  56                 public SecurityZone SecurityZone {
  57                         get { return zone; }
  58                         set {
  59                                 if (!Enum.IsDefined (typeof (SecurityZone), value)) {
  60                                         throw new ArgumentException (Locale.GetText (
  61                                                 "invalid zone"));
  62                                 }
  63                                 if (value == SecurityZone.NoZone) {
  64                                         throw new ArgumentException (Locale.GetText (
  65                                                 "NoZone isn't valid for membership condition"));
  66                                 }
  67
  68                                 zone = value;
  69                         }
  70                 }
  71
  72                 public bool Check (Evidence evidence)
  73                 {
  74                         if (evidence == null)
  75                                 return false;
  76
  77                         IEnumerator e = evidence.GetHostEnumerator ();
  78                         while (e.MoveNext ()) {
  79                                 Zone z = (e.Current as Zone);
  80                                 if (z != null) {
  81                                         if (z.SecurityZone == zone)
  82                                                 return true;
  83                                 }
  84                         }
  85                         return false;
  86                 }
  87
  88                 public IMembershipCondition Copy ()
  89                 {
  90                         return new ZoneMembershipCondition (zone);
  91                 }
  92
  93                 public override bool Equals (object o)
  94                 {
  95                         ZoneMembershipCondition zmc = (o as ZoneMembershipCondition);
  96                         if (zmc == null)
  97                                 return false;
  98                         return (zmc.SecurityZone == zone);
  99                 }
 100
 101                 public void FromXml (SecurityElement e)
 102                 {
 103                         FromXml (e, null);
 104                 }
 105
 106                 public void FromXml (SecurityElement e, PolicyLevel level)
 107                 {
 108                         MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
 109
 110                         string z = e.Attribute ("Zone");
 111                         if (z != null) {
 112                                 zone = (SecurityZone) Enum.Parse (typeof (SecurityZone), z);
 113                         }
 114                 }
 115
 116                 public override int GetHashCode ()
 117                 {
 118                         return zone.GetHashCode ();
 119                 }
 120
 121                 public override string ToString ()
 122                 {
 123                         return "Zone - " + zone;
 124                 }
 125
 126                 public SecurityElement ToXml ()
 127                 {
 128                         return ToXml (null);
 129                 }
 130
 131                 public SecurityElement ToXml (PolicyLevel level)
 132                 {
 133                         // PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
 134                         SecurityElement se = MembershipConditionHelper.Element (typeof (ZoneMembershipCondition), version);
 135                         se.AddAttribute ("Zone", zone.ToString ());
 136                         return se;
 137                 }
 138         }
 139 }