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//
// System.Web.AspNetHostingPermission.cs
//
// Authors:
// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Security;
using System.Security.Permissions;
namespace System.Web {
[Serializable]
public sealed class AspNetHostingPermission : CodeAccessPermission, IUnrestrictedPermission {
private const int version = 1;
private AspNetHostingPermissionLevel _level;
public AspNetHostingPermission (AspNetHostingPermissionLevel level)
{
// use the property to get the enum validation
Level = level;
}
public AspNetHostingPermission (PermissionState state)
{
if (PermissionHelper.CheckPermissionState (state, true) == PermissionState.Unrestricted)
_level = AspNetHostingPermissionLevel.Unrestricted;
else
_level = AspNetHostingPermissionLevel.None;
}
public AspNetHostingPermissionLevel Level {
get { return _level; }
set {
if ((value < AspNetHostingPermissionLevel.None) || (value > AspNetHostingPermissionLevel.Unrestricted)) {
string msg = Locale.GetText ("Invalid enum {0}.");
throw new ArgumentException (String.Format (msg, value), "Level");
}
_level = value;
}
}
public bool IsUnrestricted ()
{
return (_level == AspNetHostingPermissionLevel.Unrestricted);
}
public override IPermission Copy ()
{
// note: no need to handle unrestricted here
return new AspNetHostingPermission (_level);
}
public override void FromXml (SecurityElement securityElement)
{
PermissionHelper.CheckSecurityElement (securityElement, "securityElement", version, version);
if (securityElement.Tag != "IPermission") {
string msg = Locale.GetText ("Invalid tag '{0}' for permission.");
throw new ArgumentException (String.Format (msg, securityElement.Tag), "securityElement");
}
if (securityElement.Attribute ("version") == null) {
string msg = Locale.GetText ("Missing version attribute.");
throw new ArgumentException (msg, "securityElement");
}
if (PermissionHelper.IsUnrestricted (securityElement)) {
// in case it's get fixed later...
_level = AspNetHostingPermissionLevel.Unrestricted;
}
else {
string level = securityElement.Attribute ("Level");
if (level != null) {
_level = (AspNetHostingPermissionLevel) Enum.Parse (
typeof (AspNetHostingPermissionLevel), level);
}
else
_level = AspNetHostingPermissionLevel.None;
}
}
public override SecurityElement ToXml ()
{
SecurityElement se = PermissionHelper.Element (typeof (AspNetHostingPermission), version);
if (IsUnrestricted ())
se.AddAttribute ("Unrestricted", "true"); // FDBK15156 fixed in 2.0 RC
se.AddAttribute ("Level", _level.ToString ());
return se;
}
public override IPermission Intersect (IPermission target)
{
AspNetHostingPermission anhp = Cast (target);
if (anhp == null)
return null;
return new AspNetHostingPermission ((_level <= anhp.Level) ? _level : anhp.Level);
}
public override bool IsSubsetOf (IPermission target)
{
AspNetHostingPermission anhp = Cast (target);
if (anhp == null)
return IsEmpty ();
return (_level <= anhp._level);
}
public override IPermission Union (IPermission target)
{
AspNetHostingPermission anhp = Cast (target);
if (anhp == null)
return Copy ();
return new AspNetHostingPermission ((_level > anhp.Level) ? _level : anhp.Level);
}
// Internal helpers methods
private bool IsEmpty ()
{
return (_level == AspNetHostingPermissionLevel.None);
}
private AspNetHostingPermission Cast (IPermission target)
{
if (target == null)
return null;
AspNetHostingPermission anhp = (target as AspNetHostingPermission);
if (anhp == null) {
PermissionHelper.ThrowInvalidPermission (target, typeof (AspNetHostingPermission));
}
return anhp;
}
}
}
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