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//
// System.Security.Permissions.ReflectionPermission.cs
//
// Authors:
// Tim Coleman <tim@timcoleman.com>
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2002, Tim Coleman
// Portions (C) 2003 Motus Technologies Inc. (http://www.motus.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;
using System.Runtime.InteropServices;
namespace System.Security.Permissions {
#if NET_2_0
[ComVisible (true)]
#endif
[Serializable]
public sealed class ReflectionPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
private const int version = 1;
ReflectionPermissionFlag flags;
public ReflectionPermission (PermissionState state)
{
if (CheckPermissionState (state, true) == PermissionState.Unrestricted)
flags = ReflectionPermissionFlag.AllFlags;
else
flags = ReflectionPermissionFlag.NoFlags;
}
public ReflectionPermission (ReflectionPermissionFlag flag)
{
// reuse validation by the Flags property
Flags = flag;
}
public ReflectionPermissionFlag Flags {
get { return flags; }
set {
if ((value & ReflectionPermissionFlag.AllFlags) != value) {
string msg = String.Format (Locale.GetText ("Invalid flags {0}"), value);
throw new ArgumentException (msg, "ReflectionPermissionFlag");
}
flags = value;
}
}
public override IPermission Copy ()
{
return new ReflectionPermission (flags);
}
public override void FromXml (SecurityElement esd)
{
// General validation in CodeAccessPermission
CheckSecurityElement (esd, "esd", version, version);
// Note: we do not (yet) care about the return value
// as we only accept version 1 (min/max values)
if (IsUnrestricted (esd)) {
flags = ReflectionPermissionFlag.AllFlags;
}
else {
flags = ReflectionPermissionFlag.NoFlags;
string xmlFlags = (esd.Attributes ["Flags"] as string);
if (xmlFlags.IndexOf ("MemberAccess") >= 0)
flags |= ReflectionPermissionFlag.MemberAccess;
if (xmlFlags.IndexOf ("ReflectionEmit") >= 0)
flags |= ReflectionPermissionFlag.ReflectionEmit;
if (xmlFlags.IndexOf ("TypeInformation") >= 0)
flags |= ReflectionPermissionFlag.TypeInformation;
}
}
public override IPermission Intersect (IPermission target)
{
ReflectionPermission rp = Cast (target);
if (rp == null)
return null;
if (IsUnrestricted ()) {
if (rp.Flags == ReflectionPermissionFlag.NoFlags)
return null;
else
return rp.Copy ();
}
if (rp.IsUnrestricted ()) {
if (flags == ReflectionPermissionFlag.NoFlags)
return null;
else
return Copy ();
}
ReflectionPermission p = (ReflectionPermission) rp.Copy ();
p.Flags &= flags;
return ((p.Flags == ReflectionPermissionFlag.NoFlags) ? null : p);
}
public override bool IsSubsetOf (IPermission target)
{
ReflectionPermission rp = Cast (target);
if (rp == null)
return (flags == ReflectionPermissionFlag.NoFlags);
if (IsUnrestricted ())
return rp.IsUnrestricted ();
else if (rp.IsUnrestricted ())
return true;
return ((flags & rp.Flags) == flags);
}
public bool IsUnrestricted ()
{
return (flags == ReflectionPermissionFlag.AllFlags);
}
public override SecurityElement ToXml ()
{
SecurityElement se = Element (version);
if (IsUnrestricted ()) {
se.AddAttribute ("Unrestricted", "true");
}
else {
if (flags == ReflectionPermissionFlag.NoFlags)
se.AddAttribute ("Flags", "NoFlags");
else if ((flags & ReflectionPermissionFlag.AllFlags) == ReflectionPermissionFlag.AllFlags)
se.AddAttribute ("Flags", "AllFlags");
else {
string xmlFlags = "";
if ((flags & ReflectionPermissionFlag.MemberAccess) == ReflectionPermissionFlag.MemberAccess)
xmlFlags = "MemberAccess";
if ((flags & ReflectionPermissionFlag.ReflectionEmit) == ReflectionPermissionFlag.ReflectionEmit) {
if (xmlFlags.Length > 0)
xmlFlags += ", ";
xmlFlags += "ReflectionEmit";
}
if ((flags & ReflectionPermissionFlag.TypeInformation) == ReflectionPermissionFlag.TypeInformation) {
if (xmlFlags.Length > 0)
xmlFlags += ", ";
xmlFlags += "TypeInformation";
}
se.AddAttribute ("Flags", xmlFlags);
}
}
return se;
}
public override IPermission Union (IPermission other)
{
ReflectionPermission rp = Cast (other);
if (other == null)
return Copy ();
if (IsUnrestricted () || rp.IsUnrestricted ())
return new ReflectionPermission (PermissionState.Unrestricted);
ReflectionPermission p = (ReflectionPermission) rp.Copy ();
p.Flags |= flags;
return p;
}
// IBuiltInPermission
int IBuiltInPermission.GetTokenIndex ()
{
return (int) BuiltInToken.Reflection;
}
// helpers
private ReflectionPermission Cast (IPermission target)
{
if (target == null)
return null;
ReflectionPermission rp = (target as ReflectionPermission);
if (rp == null) {
ThrowInvalidPermission (target, typeof (ReflectionPermission));
}
return rp;
}
}
}
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