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 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
  33 namespace System.Security.Permissions {
  34
  35         [Serializable]
  36         public sealed class KeyContainerPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
  37
  38                 private KeyContainerPermissionAccessEntryCollection _accessEntries;
  39                 private KeyContainerPermissionFlags _flags;
  40
  41                 private const int version = 1;
  42
  43                 // Constructors
  44
  45                 public KeyContainerPermission (PermissionState state)
  46                 {
  47                         if (CheckPermissionState (state, true) == PermissionState.Unrestricted) {
  48                                 _flags = KeyContainerPermissionFlags.AllFlags;
  49                         }
  50                 }
  51
  52                 public KeyContainerPermission (KeyContainerPermissionFlags flags)
  53                 {
  54                         SetFlags (flags);
  55                 }
  56
  57                 public KeyContainerPermission (KeyContainerPermissionFlags flags, KeyContainerPermissionAccessEntry[] accessList)
  58                 {
  59                         SetFlags (flags);
  60                         if (accessList != null) {
  61                                 foreach (KeyContainerPermissionAccessEntry kcpae in accessList) {
  62                                         _accessEntries.Add (kcpae);
  63                                 }
  64                         }
  65                 }
  66
  67                 // Properties
  68
  69                 public KeyContainerPermissionAccessEntryCollection AccessEntries {
  70                         get { return _accessEntries; }
  71                 }
  72
  73                 public KeyContainerPermissionFlags Flags {
  74                         get { return _flags; }
  75                 }
  76
  77                 // Methods
  78
  79                 public override IPermission Copy ()
  80                 {
  81                         if (_accessEntries.Count == 0)
  82                                 return new KeyContainerPermission (_flags);
  83
  84                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [_accessEntries.Count];
  85                         _accessEntries.CopyTo (list, 0);
  86                         return new KeyContainerPermission (_flags, list);
  87                 }
  88
  89                 public override void FromXml (SecurityElement esd)
  90                 {
  91                         // General validation in CodeAccessPermission
  92                         CheckSecurityElement (esd, "esd", version, version);
  93                         // Note: we do not (yet) care about the return value
  94                         // as we only accept version 1 (min/max values)
  95
  96                         if (IsUnrestricted (esd)) {
  97                                 _flags = KeyContainerPermissionFlags.AllFlags;
  98                         }
  99                         else {
 100                                 // ???
 101                                 _flags = (KeyContainerPermissionFlags) Enum.Parse (
 102                                         typeof (KeyContainerPermissionFlags), esd.Attribute ("Flags"));
 103                         }
 104                 }
 105
 106                 [MonoTODO]
 107                 public override IPermission Intersect (IPermission target)
 108                 {
 109                         return null;
 110                 }
 111
 112                 [MonoTODO]
 113                 public override bool IsSubsetOf (IPermission target)
 114                 {
 115                         return false;
 116                 }
 117
 118                 public bool IsUnrestricted ()
 119                 {
 120                         return (_flags == KeyContainerPermissionFlags.AllFlags);
 121                 }
 122
 123                 public override SecurityElement ToXml ()
 124                 {
 125                         SecurityElement e = Element (version);
 126                         if (IsUnrestricted ()) {
 127                                 e.AddAttribute ("Unrestricted", "true");
 128                         }
 129                         else {
 130                                 // TODO
 131                         }
 132                         return e;
 133                 }
 134
 135                 public override IPermission Union (IPermission target)
 136                 {
 137                         KeyContainerPermission kcp = Cast (target);
 138                         if (kcp == null)
 139                                 return Copy ();
 140
 141                         KeyContainerPermissionAccessEntryCollection kcpaec = new KeyContainerPermissionAccessEntryCollection ();
 142                         // copy first group
 143                         foreach (KeyContainerPermissionAccessEntry kcpae in _accessEntries) {
 144                                 kcpaec.Add (kcpae);
 145                         }
 146                         // copy second group...
 147                         foreach (KeyContainerPermissionAccessEntry kcpae in kcp._accessEntries) {
 148                                 // ... but only if not present in first group
 149                                 if (_accessEntries.IndexOf (kcpae) == -1)
 150                                         kcpaec.Add (kcpae);
 151                         }
 152
 153                         if (kcpaec.Count == 0)
 154                                 return new KeyContainerPermission ((_flags | kcp._flags));
 155
 156                         KeyContainerPermissionAccessEntry[] list = new KeyContainerPermissionAccessEntry [kcpaec.Count];
 157                         kcpaec.CopyTo (list, 0);
 158                         return new KeyContainerPermission ((_flags | kcp._flags), list);
 159                 }
 160
 161                 // IBuiltInPermission
 162                 int IBuiltInPermission.GetTokenIndex ()
 163                 {
 164                         return (int) BuiltInToken.KeyContainer;
 165                 }
 166
 167                 // helpers
 168
 169                 private void SetFlags (KeyContainerPermissionFlags flags)
 170                 {
 171                         if ((flags & KeyContainerPermissionFlags.AllFlags) != 0) {
 172                                 string msg = String.Format (Locale.GetText ("Invalid enum {0}"), flags);
 173                                 throw new ArgumentException (msg, "KeyContainerPermissionFlags");
 174                         }
 175                         _flags = flags;
 176                 }
 177
 178                 private KeyContainerPermission Cast (IPermission target)
 179                 {
 180                         if (target == null)
 181                                 return null;
 182
 183                         KeyContainerPermission kcp = (target as KeyContainerPermission);
 184                         if (kcp == null) {
 185                                 ThrowInvalidPermission (target, typeof (KeyContainerPermission));
 186                         }
 187
 188                         return kcp;
 189                 }
 190         }
 191 }
 192
 193 #endif