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 using System.Security;
  31 using System.Security.Permissions;
  32
  33 namespace System.Web {
  34
  35         [Serializable]
  36         public sealed class AspNetHostingPermission : CodeAccessPermission, IUnrestrictedPermission {
  37
  38                 private const int version = 1;
  39
  40                 private AspNetHostingPermissionLevel _level;
  41
  42                 public AspNetHostingPermission (AspNetHostingPermissionLevel level)
  43                 {
  44                         // use the property to get the enum validation
  45                         Level = level;
  46                 }
  47
  48                 public AspNetHostingPermission (PermissionState state)
  49                 {
  50                         if (PermissionHelper.CheckPermissionState (state, true) == PermissionState.Unrestricted)
  51                                 _level = AspNetHostingPermissionLevel.Unrestricted;
  52                         else
  53                                 _level = AspNetHostingPermissionLevel.None;
  54                 }
  55
  56                 public AspNetHostingPermissionLevel Level {
  57                         get { return _level; }
  58                         set {
  59                                 if ((value < AspNetHostingPermissionLevel.None) || (value > AspNetHostingPermissionLevel.Unrestricted)) {
  60                                         string msg = Locale.GetText ("Invalid enum {0}.");
  61                                         throw new ArgumentException (String.Format (msg, value), "Level");
  62                                 }
  63                                 _level = value;
  64                         }
  65                 }
  66
  67                 public bool IsUnrestricted ()
  68                 {
  69                         return (_level == AspNetHostingPermissionLevel.Unrestricted);
  70                 }
  71
  72                 public override IPermission Copy ()
  73                 {
  74                         // note: no need to handle unrestricted here
  75                         return new AspNetHostingPermission (_level);
  76                 }
  77
  78                 public override void FromXml (SecurityElement securityElement)
  79                 {
  80                         PermissionHelper.CheckSecurityElement (securityElement, "securityElement", version, version);
  81                         if (securityElement.Tag != "IPermission") {
  82                                 string msg = Locale.GetText ("Invalid tag '{0}' for permission.");
  83                                 throw new ArgumentException (String.Format (msg, securityElement.Tag), "securityElement");
  84                         }
  85                         if (securityElement.Attribute ("version") == null) {
  86                                 string msg = Locale.GetText ("Missing version attribute.");
  87                                 throw new ArgumentException (msg, "securityElement");
  88                         }
  89
  90                         if (PermissionHelper.IsUnrestricted (securityElement)) {
  91                                 // in case it's get fixed later...
  92                                 _level = AspNetHostingPermissionLevel.Unrestricted;
  93                         }
  94                         else {
  95                                 string level = securityElement.Attribute ("Level");
  96                                 if (level != null) {
  97                                         _level = (AspNetHostingPermissionLevel) Enum.Parse (
  98                                                 typeof (AspNetHostingPermissionLevel), level);
  99                                 }
 100                                 else
 101                                         _level = AspNetHostingPermissionLevel.None;
 102                         }
 103                 }
 104
 105                 public override SecurityElement ToXml ()
 106                 {
 107                         SecurityElement se = PermissionHelper.Element (typeof (AspNetHostingPermission), version);
 108                         if (IsUnrestricted ())
 109                                 se.AddAttribute ("Unrestricted", "true"); // FDBK15156 fixed in 2.0 RC
 110                         se.AddAttribute ("Level", _level.ToString ());
 111                         return se;
 112                 }
 113
 114                 public override IPermission Intersect (IPermission target)
 115                 {
 116                         AspNetHostingPermission anhp = Cast (target);
 117                         if (anhp == null)
 118                                 return null;
 119
 120                         return new AspNetHostingPermission ((_level <= anhp.Level) ? _level : anhp.Level);
 121                 }
 122
 123                 public override bool IsSubsetOf (IPermission target)
 124                 {
 125                         AspNetHostingPermission anhp = Cast (target);
 126                         if (anhp == null)
 127                                 return IsEmpty ();
 128                         return (_level <= anhp._level);
 129                 }
 130
 131                 public override IPermission Union (IPermission target)
 132                 {
 133                         AspNetHostingPermission anhp = Cast (target);
 134                         if (anhp == null)
 135                                 return Copy ();
 136                         return new AspNetHostingPermission ((_level > anhp.Level) ? _level : anhp.Level);
 137                 }
 138
 139                 // Internal helpers methods
 140
 141                 private bool IsEmpty ()
 142                 {
 143                         return (_level == AspNetHostingPermissionLevel.None);
 144                 }
 145
 146                 private AspNetHostingPermission Cast (IPermission target)
 147                 {
 148                         if (target == null)
 149                                 return null;
 150
 151                         AspNetHostingPermission anhp = (target as AspNetHostingPermission);
 152                         if (anhp == null) {
 153                                 PermissionHelper.ThrowInvalidPermission (target, typeof (AspNetHostingPermission));
 154                         }
 155
 156                         return anhp;
 157                 }
 158         }
 159 }