mcs/class/System/System.Web/AspNetHostingPermission.cs

   1 //
   2 // System.Web.AspNetHostingPermission.cs
   3 //
   4 // Authors:
   5 //      Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   6 //      Sebastien Pouliot  <sebastien@ximian.com>
   7 //
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 #if NET_1_1
  31
  32 using System.Security;
  33 using System.Security.Permissions;
  34
  35 namespace System.Web {
  36
  37         [Serializable]
  38         public sealed class AspNetHostingPermission : CodeAccessPermission, IUnrestrictedPermission {
  39
  40                 private const int version = 1;
  41
  42                 private AspNetHostingPermissionLevel _level;
  43
  44                 public AspNetHostingPermission (AspNetHostingPermissionLevel level)
  45                 {
  46                         // use the property to get the enum validation
  47                         Level = level;
  48                 }
  49
  50                 public AspNetHostingPermission (PermissionState state)
  51                 {
  52                         if (PermissionHelper.CheckPermissionState (state, true) == PermissionState.Unrestricted)
  53                                 _level = AspNetHostingPermissionLevel.Unrestricted;
  54                         else
  55                                 _level = AspNetHostingPermissionLevel.None;
  56                 }
  57
  58                 public AspNetHostingPermissionLevel Level {
  59                         get { return _level; }
  60                         set {
  61                                 if ((value < AspNetHostingPermissionLevel.None) || (value > AspNetHostingPermissionLevel.Unrestricted)) {
  62                                         string msg = Locale.GetText ("Invalid enum {0}.");
  63                                         throw new ArgumentException (String.Format (msg, value), "Level");
  64                                 }
  65                                 _level = value;
  66                         }
  67                 }
  68
  69                 public bool IsUnrestricted ()
  70                 {
  71                         return (_level == AspNetHostingPermissionLevel.Unrestricted);
  72                 }
  73
  74                 public override IPermission Copy ()
  75                 {
  76                         // note: no need to handle unrestricted here
  77                         return new AspNetHostingPermission (_level);
  78                 }
  79
  80                 public override void FromXml (SecurityElement securityElement)
  81                 {
  82                         PermissionHelper.CheckSecurityElement (securityElement, "securityElement", version, version);
  83                         if (securityElement.Tag != "IPermission") {
  84                                 string msg = Locale.GetText ("Invalid tag '{0}' for permission.");
  85                                 throw new ArgumentException (String.Format (msg, securityElement.Tag), "securityElement");
  86                         }
  87                         if (securityElement.Attribute ("version") == null) {
  88                                 string msg = Locale.GetText ("Missing version attribute.");
  89                                 throw new ArgumentException (msg, "securityElement");
  90                         }
  91
  92                         if (PermissionHelper.IsUnrestricted (securityElement)) {
  93                                 // in case it's get fixed later...
  94                                 _level = AspNetHostingPermissionLevel.Unrestricted;
  95                         }
  96                         else {
  97                                 string level = securityElement.Attribute ("Level");
  98                                 if (level != null) {
  99                                         _level = (AspNetHostingPermissionLevel) Enum.Parse (
 100                                                 typeof (AspNetHostingPermissionLevel), level);
 101                                 }
 102                                 else
 103                                         _level = AspNetHostingPermissionLevel.None;
 104                         }
 105                 }
 106
 107                 public override SecurityElement ToXml ()
 108                 {
 109                         SecurityElement se = PermissionHelper.Element (typeof (AspNetHostingPermission), version);
 110 #if NET_2_0
 111                         if (IsUnrestricted ())
 112                                 se.AddAttribute ("Unrestricted", "true"); // FDBK15156 fixed in 2.0 RC
 113 #endif
 114                         se.AddAttribute ("Level", _level.ToString ());
 115                         return se;
 116                 }
 117
 118                 public override IPermission Intersect (IPermission target)
 119                 {
 120                         AspNetHostingPermission anhp = Cast (target);
 121                         if (anhp == null)
 122                                 return null;
 123
 124                         return new AspNetHostingPermission ((_level <= anhp.Level) ? _level : anhp.Level);
 125                 }
 126
 127                 public override bool IsSubsetOf (IPermission target)
 128                 {
 129                         AspNetHostingPermission anhp = Cast (target);
 130                         if (anhp == null)
 131                                 return IsEmpty ();
 132                         return (_level <= anhp._level);
 133                 }
 134
 135                 public override IPermission Union (IPermission target)
 136                 {
 137                         AspNetHostingPermission anhp = Cast (target);
 138                         if (anhp == null)
 139                                 return Copy ();
 140                         return new AspNetHostingPermission ((_level > anhp.Level) ? _level : anhp.Level);
 141                 }
 142
 143                 // Internal helpers methods
 144
 145                 private bool IsEmpty ()
 146                 {
 147                         return (_level == AspNetHostingPermissionLevel.None);
 148                 }
 149
 150                 private AspNetHostingPermission Cast (IPermission target)
 151                 {
 152                         if (target == null)
 153                                 return null;
 154
 155                         AspNetHostingPermission anhp = (target as AspNetHostingPermission);
 156                         if (anhp == null) {
 157                                 PermissionHelper.ThrowInvalidPermission (target, typeof (AspNetHostingPermission));
 158                         }
 159
 160                         return anhp;
 161                 }
 162         }
 163 }
 164
 165 #endif