//
// System.Security.Permissions.PermissionHelper.cs
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004 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{
internal sealed class PermissionHelper {
// snippet moved from FileIOPermission (nickd) to be reused in all derived classes
internal static SecurityElement Element (Type type, int version)
{
SecurityElement se = new SecurityElement ("IPermission");
se.AddAttribute ("class", type.FullName + ", " + type.Assembly.ToString ().Replace ('\"', '\''));
se.AddAttribute ("version", version.ToString ());
return se;
}
internal static PermissionState CheckPermissionState (PermissionState state, bool allowUnrestricted)
{
string msg;
switch (state) {
case PermissionState.None:
break;
case PermissionState.Unrestricted:
if (!allowUnrestricted) {
msg = Locale.GetText ("Unrestricted isn't not allowed for identity permissions.");
throw new ArgumentException (msg, "state");
}
break;
default:
msg = String.Format (Locale.GetText ("Invalid enum {0}"), state);
throw new ArgumentException (msg, "state");
}
return state;
}
internal static int CheckSecurityElement (SecurityElement se, string parameterName, int minimumVersion, int maximumVersion)
{
if (se == null)
throw new ArgumentNullException (parameterName);
if (se.Attribute ("class") == null) {
string msg = Locale.GetText ("Missing 'class' attribute.");
throw new ArgumentException (msg, parameterName);
}
// we assume minimum version if no version number is supplied
int version = minimumVersion;
string v = se.Attribute ("version");
if (v != null) {
try {
version = Int32.Parse (v);
}
catch (Exception e) {
string msg = Locale.GetText ("Couldn't parse version from '{0}'.");
msg = String.Format (msg, v);
throw new ArgumentException (msg, parameterName, e);
}
}
if ((version < minimumVersion) || (version > maximumVersion)) {
string msg = Locale.GetText ("Unknown version '{0}', expected versions between ['{1}','{2}'].");
msg = String.Format (msg, version, minimumVersion, maximumVersion);
throw new ArgumentException (msg, parameterName);
}
return version;
}
// must be called after CheckSecurityElement (i.e. se != null)
internal static bool IsUnrestricted (SecurityElement se)
{
string value = se.Attribute ("Unrestricted");
if (value == null)
return false;
return (String.Compare (value, Boolean.TrueString, true, CultureInfo.InvariantCulture) == 0);
}
internal static void ThrowInvalidPermission (IPermission target, Type expected)
{
string msg = Locale.GetText ("Invalid permission type '{0}', expected type '{1}'.");
msg = String.Format (msg, target.GetType (), expected);
throw new ArgumentException (msg, "target");
}
}
}
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