UIPermission.cs :  » 2.6.4-mono-.net-core » System.Security » System » Security » Permissions » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Security 
System.Security » System » Security » Permissions » UIPermission.cs
//
// 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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