mcs/class/corlib/System.Security.Permissions/ZoneIdentityPermission.cs

   1 //
   2 // System.Security.Permissions.ZoneIdentityPermission
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // (C) 2002 Ximian, Inc (http://www.ximian.com)
   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;
  32 using System.Globalization;
  33 using System.Security;
  34
  35 namespace System.Security.Permissions {
  36
  37         [Serializable]
  38         public sealed class ZoneIdentityPermission : CodeAccessPermission, IBuiltInPermission {
  39
  40                 private SecurityZone zone;
  41
  42                 public ZoneIdentityPermission (PermissionState state)
  43                 {
  44                         switch (state) {
  45                                 case PermissionState.None:
  46                                         zone = SecurityZone.NoZone;
  47                                         break;
  48                                 case PermissionState.Unrestricted:
  49                                         throw new ArgumentException (Locale.GetText (
  50                                                 "unrestricted not allowed"));
  51                                 default:
  52                                         throw new ArgumentException (Locale.GetText (
  53                                                 "invalid state"));
  54                         }
  55                 }
  56
  57                 public ZoneIdentityPermission (SecurityZone zone)
  58                 {
  59                         // also needs the validations
  60                         SecurityZone = zone;
  61                 }
  62
  63                 public override IPermission Copy ()
  64                 {
  65                         return new ZoneIdentityPermission (zone);
  66                 }
  67
  68                 public override bool IsSubsetOf (IPermission target)
  69                 {
  70                         if (target == null)
  71                                 return zone == SecurityZone.NoZone;
  72
  73                         ZoneIdentityPermission zip = (target as ZoneIdentityPermission);
  74                         if (zip == null) {
  75                                 throw new ArgumentException (Locale.GetText (
  76                                         "Invalid permission"));
  77                         }
  78
  79                         return (zone == zip.zone);
  80                 }
  81
  82                 public override IPermission Union (IPermission target)
  83                 {
  84                         if (target == null)
  85                                 return (zone == SecurityZone.NoZone) ? null : Copy ();
  86
  87                         ZoneIdentityPermission zip = (target as ZoneIdentityPermission);
  88                         if (zip == null) {
  89                                 throw new ArgumentException (Locale.GetText (
  90                                         "Invalid permission"));
  91                         }
  92
  93                         if (zone == zip.zone || zip.zone == SecurityZone.NoZone)
  94                                 return Copy ();
  95
  96                         if (zone == SecurityZone.NoZone)
  97                                 return zip.Copy ();
  98 #if NET_2_0
  99                         throw new ArgumentException (Locale.GetText (
 100                                 "Union impossible"));
 101 #else
 102                         return null;
 103 #endif
 104                 }
 105
 106                 public override IPermission Intersect (IPermission target)
 107                 {
 108                         if (target == null || zone == SecurityZone.NoZone)
 109                                 return null;
 110
 111                         ZoneIdentityPermission zip = (target as ZoneIdentityPermission);
 112                         if (zip == null) {
 113                                 throw new ArgumentException (Locale.GetText (
 114                                         "Invalid permission"));
 115                         }
 116
 117                         if (zone == zip.zone)
 118                                 return Copy ();
 119
 120                         return null;
 121                 }
 122
 123                 public override void FromXml (SecurityElement esd)
 124                 {
 125                         if (esd == null)
 126                                 throw new ArgumentException ("esd");
 127
 128                         if (esd.Attribute ("version") != "1") {
 129                                 throw new ArgumentException (Locale.GetText (
 130                                         "version attributte is wrong"));
 131                         }
 132
 133                         string zoneName = esd.Attribute ("Zone");
 134                         zone = (SecurityZone) Enum.Parse (typeof (SecurityZone), zoneName);
 135                 }
 136
 137                 public override SecurityElement ToXml ()
 138                 {
 139                         SecurityElement se = new SecurityElement ("IPermission");
 140                         Type t = GetType ();
 141                         se.AddAttribute ("class", t.FullName + ", " + t.Module.Assembly.FullName);
 142                         se.AddAttribute ("version", "1");
 143                         se.AddAttribute ("Zone", zone.ToString ());
 144
 145                         return se;
 146                 }
 147
 148                 public SecurityZone SecurityZone {
 149                         get { return zone; }
 150                         set {
 151                                 if (!Enum.IsDefined (typeof (SecurityZone), value)) {
 152                                         throw new ArgumentException (Locale.GetText (
 153                                                 "invalid zone"));
 154                                 }
 155                                 zone = value;
 156                         }
 157                 }
 158
 159                 // IBuiltInPermission
 160                 int IBuiltInPermission.GetTokenIndex ()
 161                 {
 162                         return 13;
 163                 }
 164         }
 165 }
 166