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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace System.Security.Permissions
{
using System;
using System.IO;
using System.Security.Util;
using System.Text;
using System.Runtime.InteropServices;
using System.Runtime.Remoting;
using System.Security;
using System.Reflection;
using System.Globalization;
using System.Diagnostics.Contracts;
[ComVisible(true)]
[Flags]
[Serializable]
public enum ReflectionPermissionFlag
{
NoFlags = 0x00,
[Obsolete("This API has been deprecated. http://go.microsoft.com/fwlink/?linkid=14202")]
TypeInformation = 0x01,
MemberAccess = 0x02,
[Obsolete("This permission is no longer used by the CLR.")]
ReflectionEmit = 0x04,
[ComVisible(false)]
RestrictedMemberAccess = 0x08,
[Obsolete("This permission has been deprecated. Use PermissionState.Unrestricted to get full access.")]
AllFlags = 0x07
}
[ComVisible(true)]
[Serializable]
sealed public class ReflectionPermission
: CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission
{
// ReflectionPermissionFlag.AllFlags doesn't contain the new value RestrictedMemberAccess,
// but we cannot change its value now because that will break apps that have that old value baked in.
// We should use this const that truely contains "all" flags instead of ReflectionPermissionFlag.AllFlags.
#pragma warning disable 618
internal const ReflectionPermissionFlag AllFlagsAndMore = ReflectionPermissionFlag.AllFlags | ReflectionPermissionFlag.RestrictedMemberAccess;
#pragma warning restore 618
private ReflectionPermissionFlag m_flags;
//
// Public Constructors
//
public ReflectionPermission(PermissionState state)
{
if (state == PermissionState.Unrestricted)
{
SetUnrestricted( true );
}
else if (state == PermissionState.None)
{
SetUnrestricted( false );
}
else
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState"));
}
}
// Parameters:
//
public ReflectionPermission(ReflectionPermissionFlag flag)
{
VerifyAccess(flag);
SetUnrestricted(false);
m_flags = flag;
}
//------------------------------------------------------
//
// PRIVATE AND PROTECTED MODIFIERS
//
//------------------------------------------------------
private void SetUnrestricted(bool unrestricted)
{
if (unrestricted)
{
m_flags = ReflectionPermission.AllFlagsAndMore;
}
else
{
Reset();
}
}
private void Reset()
{
m_flags = ReflectionPermissionFlag.NoFlags;
}
public ReflectionPermissionFlag Flags
{
set
{
VerifyAccess(value);
m_flags = value;
}
get
{
return m_flags;
}
}
#if ZERO // Do not remove this code, useful for debugging
public override String ToString()
{
StringBuilder sb = new StringBuilder();
sb.Append("ReflectionPermission(");
if (IsUnrestricted())
{
sb.Append("Unrestricted");
}
else
{
if (GetFlag(ReflectionPermissionFlag.TypeInformation))
sb.Append("TypeInformation; ");
if (GetFlag(ReflectionPermissionFlag.MemberAccess))
sb.Append("MemberAccess; ");
#pragma warning disable 618
if (GetFlag(ReflectionPermissionFlag.ReflectionEmit))
sb.Append("ReflectionEmit; ");
#pragma warning restore 618
}
sb.Append(")");
return sb.ToString();
}
#endif
//
// CodeAccessPermission implementation
//
public bool IsUnrestricted()
{
return m_flags == ReflectionPermission.AllFlagsAndMore;
}
//
// IPermission implementation
//
public override IPermission Union(IPermission other)
{
if (other == null)
{
return this.Copy();
}
else if (!VerifyType(other))
{
throw new
ArgumentException(
Environment.GetResourceString("Argument_WrongType", this.GetType().FullName)
);
}
ReflectionPermission operand = (ReflectionPermission)other;
if (this.IsUnrestricted() || operand.IsUnrestricted())
{
return new ReflectionPermission( PermissionState.Unrestricted );
}
else
{
ReflectionPermissionFlag flag_union = (ReflectionPermissionFlag)(m_flags | operand.m_flags);
return(new ReflectionPermission(flag_union));
}
}
public override bool IsSubsetOf(IPermission target)
{
if (target == null)
{
return m_flags == ReflectionPermissionFlag.NoFlags;
}
try
{
ReflectionPermission operand = (ReflectionPermission)target;
if (operand.IsUnrestricted())
return true;
else if (this.IsUnrestricted())
return false;
else
return (((int)this.m_flags) & ~((int)operand.m_flags)) == 0;
}
catch (InvalidCastException)
{
throw new
ArgumentException(
Environment.GetResourceString("Argument_WrongType", this.GetType().FullName)
);
}
}
public override IPermission Intersect(IPermission target)
{
if (target == null)
return null;
else if (!VerifyType(target))
{
throw new
ArgumentException(
Environment.GetResourceString("Argument_WrongType", this.GetType().FullName)
);
}
ReflectionPermission operand = (ReflectionPermission)target;
ReflectionPermissionFlag newFlags = operand.m_flags & this.m_flags;
if (newFlags == ReflectionPermissionFlag.NoFlags)
return null;
else
return new ReflectionPermission( newFlags );
}
public override IPermission Copy()
{
if (this.IsUnrestricted())
{
return new ReflectionPermission(PermissionState.Unrestricted);
}
else
{
return new ReflectionPermission((ReflectionPermissionFlag)m_flags);
}
}
//
// IEncodable Interface
private
void VerifyAccess(ReflectionPermissionFlag type)
{
if ((type & ~ReflectionPermission.AllFlagsAndMore) != 0)
throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)type));
Contract.EndContractBlock();
}
/// <internalonly/>
int IBuiltInPermission.GetTokenIndex()
{
return ReflectionPermission.GetTokenIndex();
}
internal static int GetTokenIndex()
{
return BuiltInPermissionIndex.ReflectionPermissionIndex;
}
}
}
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