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

   1 //
   2 // System.Security.Permissions.KeyContainerPermission class
   3 //
   4 // Author
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0
  30
  31 using System.Globalization;
  32 using System.Runtime.InteropServices;
  33
  34 namespace System.Security.Permissions {
  35
  36         [Serializable]
  37         [ComVisible (true)]
  38         public sealed class KeyContainerPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
  39
  40                 private KeyContainerPermissionAccessEntryCollection _accessEntries;
  41                 private KeyContainerPermissionFlags _flags;
  42
  43                 private const int version = 1;
  44
  45                 // Constructors
  46
  47                 public KeyContainerPermission (PermissionState state)
  48                 {
  49                         if (CheckPermissionState (state, true) == PermissionState.Unrestricted) {
  50                                 _flags = KeyContainerPermissionFlags.AllFlags;
  51                         }
  52                 }
  53
  54                 public KeyContainerPermission (KeyContainerPermissionFlags flags)
  55                 {
  56                         SetFlags (flags);
  57                 }
  58
  59                 public KeyContainerPermission (KeyContainerPermissionFlags flags, KeyContainerPermissionAccessEntry[] accessList)
  60                 {
  61                         SetFlags (flags);
  62                         if (accessList != null) {
  63                                 foreach (KeyContainerPermissionAccessEntry kcpae in accessList) {
  64                                         _accessEntries.Add (kcpae);
  65                                 }
  66                         }
  67                 }
  68
  69                 // Properties
  70
  71                 public KeyContainerPermissionAccessEntryCollection AccessEntries {
  72                         get { return _accessEntries; }
  73                 }
  74
  75                 public KeyContainerPermissionFlags Flags {
  76                         get { return _flags; }
  77                 }
  78
  79                 // Methods
  80
  81                 public override IPermission Copy ()
  82                 {
  83                         if (_accessEntries.Count == 0)
  84                                 return new KeyContainerPermission (_flags);
  85
  86                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [_accessEntries.Count];
  87                         _accessEntries.CopyTo (list, 0);
  88                         return new KeyContainerPermission (_flags, list);
  89                 }
  90
  91                 public override void FromXml (SecurityElement esd)
  92                 {
  93                         // General validation in CodeAccessPermission
  94                         CheckSecurityElement (esd, "esd", version, version);
  95                         // Note: we do not (yet) care about the return value
  96                         // as we only accept version 1 (min/max values)
  97
  98                         if (IsUnrestricted (esd)) {
  99                                 _flags = KeyContainerPermissionFlags.AllFlags;
 100                         }
 101                         else {
 102                                 // ???
 103                                 _flags = (KeyContainerPermissionFlags) Enum.Parse (
 104                                         typeof (KeyContainerPermissionFlags), esd.Attribute ("Flags"));
 105                         }
 106                 }
 107
 108                 [MonoTODO]
 109                 public override IPermission Intersect (IPermission target)
 110                 {
 111                         return null;
 112                 }
 113
 114                 [MonoTODO]
 115                 public override bool IsSubsetOf (IPermission target)
 116                 {
 117                         return false;
 118                 }
 119
 120                 public bool IsUnrestricted ()
 121                 {
 122                         return (_flags == KeyContainerPermissionFlags.AllFlags);
 123                 }
 124
 125                 public override SecurityElement ToXml ()
 126                 {
 127                         SecurityElement e = Element (version);
 128                         if (IsUnrestricted ()) {
 129                                 e.AddAttribute ("Unrestricted", "true");
 130                         }
 131                         else {
 132                                 // TODO
 133                         }
 134                         return e;
 135                 }
 136
 137                 public override IPermission Union (IPermission target)
 138                 {
 139                         KeyContainerPermission kcp = Cast (target);
 140                         if (kcp == null)
 141                                 return Copy ();
 142
 143                         KeyContainerPermissionAccessEntryCollection kcpaec = new KeyContainerPermissionAccessEntryCollection ();
 144                         // copy first group
 145                         foreach (KeyContainerPermissionAccessEntry kcpae in _accessEntries) {
 146                                 kcpaec.Add (kcpae);
 147                         }
 148                         // copy second group...
 149                         foreach (KeyContainerPermissionAccessEntry kcpae in kcp._accessEntries) {
 150                                 // ... but only if not present in first group
 151                                 if (_accessEntries.IndexOf (kcpae) == -1)
 152                                         kcpaec.Add (kcpae);
 153                         }
 154
 155                         if (kcpaec.Count == 0)
 156                                 return new KeyContainerPermission ((_flags | kcp._flags));
 157
 158                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [kcpaec.Count];
 159                         kcpaec.CopyTo (list, 0);
 160                         return new KeyContainerPermission ((_flags | kcp._flags), list);
 161                 }
 162
 163                 // IBuiltInPermission
 164                 int IBuiltInPermission.GetTokenIndex ()
 165                 {
 166                         return (int) BuiltInToken.KeyContainer;
 167                 }
 168
 169                 // helpers
 170
 171                 private void SetFlags (KeyContainerPermissionFlags flags)
 172                 {
 173                         if ((flags & KeyContainerPermissionFlags.AllFlags) != 0) {
 174                                 string msg = String.Format (Locale.GetText ("Invalid enum {0}"), flags);
 175                                 throw new ArgumentException (msg, "KeyContainerPermissionFlags");
 176                         }
 177                         _flags = flags;
 178                 }
 179
 180                 private KeyContainerPermission Cast (IPermission target)
 181                 {
 182                         if (target == null)
 183                                 return null;
 184
 185                         KeyContainerPermission kcp = (target as KeyContainerPermission);
 186                         if (kcp == null) {
 187                                 ThrowInvalidPermission (target, typeof (KeyContainerPermission));
 188                         }
 189
 190                         return kcp;
 191                 }
 192         }
 193 }
 194
 195 #endif