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//
// System.Security.Permissions.DataProtectionPermission class
//
// Author:
// 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.Globalization;
namespace System.Security.Permissions {
[Serializable]
public sealed class DataProtectionPermission : CodeAccessPermission, IUnrestrictedPermission {
private const int version = 1;
private DataProtectionPermissionFlags _flags;
public DataProtectionPermission (PermissionState state)
{
if (PermissionHelper.CheckPermissionState (state, true) == PermissionState.Unrestricted)
_flags = DataProtectionPermissionFlags.AllFlags;
}
public DataProtectionPermission (DataProtectionPermissionFlags flag)
{
// reuse validation by the Flags property
Flags = flag;
}
public DataProtectionPermissionFlags Flags {
get { return _flags; }
set {
if ((value & ~DataProtectionPermissionFlags.AllFlags) != 0) {
string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
throw new ArgumentException (msg, "DataProtectionPermissionFlags");
}
_flags = value;
}
}
public bool IsUnrestricted ()
{
return (_flags == DataProtectionPermissionFlags.AllFlags);
}
public override IPermission Copy ()
{
return new DataProtectionPermission (_flags);
}
public override IPermission Intersect (IPermission target)
{
DataProtectionPermission dp = Cast (target);
if (dp == null)
return null;
if (this.IsUnrestricted () && dp.IsUnrestricted ())
return new DataProtectionPermission (PermissionState.Unrestricted);
if (this.IsUnrestricted ())
return dp.Copy ();
if (dp.IsUnrestricted ())
return this.Copy ();
return new DataProtectionPermission (_flags & dp._flags);
}
public override IPermission Union (IPermission target)
{
DataProtectionPermission dp = Cast (target);
if (dp == null)
return this.Copy ();
if (this.IsUnrestricted () || dp.IsUnrestricted ())
return new SecurityPermission (PermissionState.Unrestricted);
return new DataProtectionPermission (_flags | dp._flags);
}
public override bool IsSubsetOf (IPermission target)
{
DataProtectionPermission dp = Cast (target);
if (dp == null)
return (_flags == DataProtectionPermissionFlags.NoFlags);
if (dp.IsUnrestricted ())
return true;
if (this.IsUnrestricted ())
return false;
return ((_flags & ~dp._flags) == 0);
}
public override void FromXml (SecurityElement securityElement)
{
// General validation in CodeAccessPermission
PermissionHelper.CheckSecurityElement (securityElement, "securityElement", version, version);
// Note: we do not (yet) care about the return value
// as we only accept version 1 (min/max values)
_flags = (DataProtectionPermissionFlags) Enum.Parse (
typeof (DataProtectionPermissionFlags), securityElement.Attribute ("Flags"));
}
public override SecurityElement ToXml ()
{
SecurityElement e = PermissionHelper.Element (typeof (DataProtectionPermission), version);
e.AddAttribute ("Flags", _flags.ToString ());
return e;
}
// helpers
private DataProtectionPermission Cast (IPermission target)
{
if (target == null)
return null;
DataProtectionPermission dp = (target as DataProtectionPermission);
if (dp == null) {
PermissionHelper.ThrowInvalidPermission (target, typeof (DataProtectionPermission));
}
return dp;
}
}
}
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