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                 [MonoTODO ("(2.0) missing support for AccessEntries")]
  92                 public override void FromXml (SecurityElement esd)
  93                 {
  94                         // General validation in CodeAccessPermission
  95                         CheckSecurityElement (esd, "esd", version, version);
  96                         // Note: we do not (yet) care about the return value
  97                         // as we only accept version 1 (min/max values)
  98
  99                         if (IsUnrestricted (esd)) {
 100                                 _flags = KeyContainerPermissionFlags.AllFlags;
 101                         }
 102                         else {
 103                                 // ???
 104                                 _flags = (KeyContainerPermissionFlags) Enum.Parse (
 105                                         typeof (KeyContainerPermissionFlags), esd.Attribute ("Flags"));
 106                         }
 107                 }
 108
 109                 [MonoTODO ("(2.0)")]
 110                 public override IPermission Intersect (IPermission target)
 111                 {
 112                         return null;
 113                 }
 114
 115                 [MonoTODO ("(2.0)")]
 116                 public override bool IsSubsetOf (IPermission target)
 117                 {
 118                         return false;
 119                 }
 120
 121                 public bool IsUnrestricted ()
 122                 {
 123                         return (_flags == KeyContainerPermissionFlags.AllFlags);
 124                 }
 125
 126                 [MonoTODO ("(2.0) missing support for AccessEntries")]
 127                 public override SecurityElement ToXml ()
 128                 {
 129                         SecurityElement e = Element (version);
 130                         if (IsUnrestricted ()) {
 131                                 e.AddAttribute ("Unrestricted", "true");
 132                         } else {
 133                                 // ...
 134                         }
 135                         return e;
 136                 }
 137
 138                 public override IPermission Union (IPermission target)
 139                 {
 140                         KeyContainerPermission kcp = Cast (target);
 141                         if (kcp == null)
 142                                 return Copy ();
 143
 144                         KeyContainerPermissionAccessEntryCollection kcpaec = new KeyContainerPermissionAccessEntryCollection ();
 145                         // copy first group
 146                         foreach (KeyContainerPermissionAccessEntry kcpae in _accessEntries) {
 147                                 kcpaec.Add (kcpae);
 148                         }
 149                         // copy second group...
 150                         foreach (KeyContainerPermissionAccessEntry kcpae in kcp._accessEntries) {
 151                                 // ... but only if not present in first group
 152                                 if (_accessEntries.IndexOf (kcpae) == -1)
 153                                         kcpaec.Add (kcpae);
 154                         }
 155
 156                         if (kcpaec.Count == 0)
 157                                 return new KeyContainerPermission ((_flags | kcp._flags));
 158
 159                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [kcpaec.Count];
 160                         kcpaec.CopyTo (list, 0);
 161                         return new KeyContainerPermission ((_flags | kcp._flags), list);
 162                 }
 163
 164                 // IBuiltInPermission
 165                 int IBuiltInPermission.GetTokenIndex ()
 166                 {
 167                         return (int) BuiltInToken.KeyContainer;
 168                 }
 169
 170                 // helpers
 171
 172                 private void SetFlags (KeyContainerPermissionFlags flags)
 173                 {
 174                         if ((flags & KeyContainerPermissionFlags.AllFlags) != 0) {
 175                                 string msg = String.Format (Locale.GetText ("Invalid enum {0}"), flags);
 176                                 throw new ArgumentException (msg, "KeyContainerPermissionFlags");
 177                         }
 178                         _flags = flags;
 179                 }
 180
 181                 private KeyContainerPermission Cast (IPermission target)
 182                 {
 183                         if (target == null)
 184                                 return null;
 185
 186                         KeyContainerPermission kcp = (target as KeyContainerPermission);
 187                         if (kcp == null) {
 188                                 ThrowInvalidPermission (target, typeof (KeyContainerPermission));
 189                         }
 190
 191                         return kcp;
 192                 }
 193         }
 194 }
 195
 196 #endif