//
// System.Security.Permissions.UIPermission.cs
//
// Author
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2003 Motus Technologies. 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{
[ComVisible (true)]
[Serializable]
public sealed class UIPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
private UIPermissionWindow _window; // Note: this (looks like) but isn't a [Flags]
private UIPermissionClipboard _clipboard; // Note: this (looks like) but isn't a [Flags]
private const int version = 1;
// Constructors
public UIPermission (PermissionState state)
{
if (CheckPermissionState (state, true) == PermissionState.Unrestricted) {
_clipboard = UIPermissionClipboard.AllClipboard;
_window = UIPermissionWindow.AllWindows;
}
}
public UIPermission (UIPermissionClipboard clipboardFlag)
{
// reuse validation by the Clipboard property
Clipboard = clipboardFlag;
}
public UIPermission (UIPermissionWindow windowFlag)
{
// reuse validation by the Window property
Window = windowFlag;
}
public UIPermission (UIPermissionWindow windowFlag, UIPermissionClipboard clipboardFlag)
{
// reuse validation by the Clipboard and Window properties
Clipboard = clipboardFlag;
Window = windowFlag;
}
// Properties
public UIPermissionClipboard Clipboard {
get { return _clipboard; }
set {
if (!Enum.IsDefined (typeof (UIPermissionClipboard), value)) {
string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
throw new ArgumentException (msg, "UIPermissionClipboard");
}
_clipboard = value;
}
}
public UIPermissionWindow Window {
get { return _window; }
set {
if (!Enum.IsDefined (typeof (UIPermissionWindow), value)) {
string msg = String.Format (Locale.GetText ("Invalid enum {0}"), value);
throw new ArgumentException (msg, "UIPermissionWindow");
}
_window = value;
}
}
// Methods
public override IPermission Copy ()
{
return new UIPermission (_window, _clipboard);
}
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)) {
_window = UIPermissionWindow.AllWindows;
_clipboard = UIPermissionClipboard.AllClipboard;
}
else {
string w = esd.Attribute ("Window");
if (w == null)
_window = UIPermissionWindow.NoWindows;
else
_window = (UIPermissionWindow) Enum.Parse (typeof (UIPermissionWindow), w);
string c = esd.Attribute ("Clipboard");
if (c == null)
_clipboard = UIPermissionClipboard.NoClipboard;
else
_clipboard = (UIPermissionClipboard) Enum.Parse (typeof (UIPermissionClipboard), c);
}
}
public override IPermission Intersect (IPermission target)
{
UIPermission uip = Cast (target);
if (uip == null)
return null;
// there are not [Flags] so we can't use boolean operators
UIPermissionWindow w = ((_window < uip._window) ? _window : uip._window);
UIPermissionClipboard c = ((_clipboard < uip._clipboard) ? _clipboard : uip._clipboard);
if (IsEmpty (w, c))
return null;
return new UIPermission (w, c);
}
public override bool IsSubsetOf (IPermission target)
{
UIPermission uip = Cast (target);
if (uip == null)
return IsEmpty (_window, _clipboard);
if (uip.IsUnrestricted ())
return true;
// there are not [Flags] so we can't use boolean operators
return ((_window <= uip._window) && (_clipboard <= uip._clipboard));
}
public bool IsUnrestricted ()
{
return ((_window == UIPermissionWindow.AllWindows) &&
(_clipboard == UIPermissionClipboard.AllClipboard));
}
public override SecurityElement ToXml ()
{
SecurityElement e = Element (version);
if (_window == UIPermissionWindow.AllWindows && _clipboard == UIPermissionClipboard.AllClipboard) {
e.AddAttribute ("Unrestricted", "true");
}
else {
if (_window != UIPermissionWindow.NoWindows)
e.AddAttribute ("Window", _window.ToString ());
if (_clipboard != UIPermissionClipboard.NoClipboard)
e.AddAttribute ("Clipboard", _clipboard.ToString ());
}
return e;
}
public override IPermission Union (IPermission target)
{
UIPermission uip = Cast (target);
if (uip == null)
return Copy ();
// there are not [Flags] so we can't use boolean operators
UIPermissionWindow w = ((_window > uip._window) ? _window : uip._window);
UIPermissionClipboard c = ((_clipboard > uip._clipboard) ? _clipboard : uip._clipboard);
if (IsEmpty (w, c))
return null;
return new UIPermission (w, c);
}
// IBuiltInPermission
int IBuiltInPermission.GetTokenIndex ()
{
return (int) BuiltInToken.UI;
}
// helpers
private bool IsEmpty (UIPermissionWindow w, UIPermissionClipboard c)
{
return ((w == UIPermissionWindow.NoWindows) && (c == UIPermissionClipboard.NoClipboard));
}
private UIPermission Cast (IPermission target)
{
if (target == null)
return null;
UIPermission uip = (target as UIPermission);
if (uip == null) {
ThrowInvalidPermission (target, typeof (UIPermission));
}
return uip;
}
}
}
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