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

//
// System.Security.Permissions.PermissionSetAttribute.cs
//
// Authors
//  Duncan Mak <duncan@ximian.com>
//  Sebastien Pouliot  <sebastien@ximian.com>
//
// (C) 2002 Ximian, Inc. http://www.ximian.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.IO;
using System.Runtime.InteropServices;
using System.Security.Policy;
using System.Text;

using Mono.Security.Cryptography;
using Mono.Xml;

namespace System.Security.Permissions{

  [ComVisible (true)]
  [AttributeUsage (AttributeTargets.Assembly | AttributeTargets.Class |
       AttributeTargets.Struct | AttributeTargets.Constructor |
       AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
  [Serializable]
  public sealed class PermissionSetAttribute : CodeAccessSecurityAttribute {

    // Fields
    private string file;
    private string name;
    private bool isUnicodeEncoded;
    private string xml;
    private string hex;
    
    // Constructor
    public PermissionSetAttribute (SecurityAction action)
      : base (action)
    {
    }
    
    // Properties
    public string File {
      get { return file; }
      set { file = value; }
    }
    public string Hex {
      get { return hex; }
      set { hex = value; }
    }
    public string Name {
      get { return name; }
      set { name = value; }
    }

    public bool UnicodeEncoded {
      get { return isUnicodeEncoded; }
      set { isUnicodeEncoded = value; }
    }

    public string XML {
      get { return xml; }
      set { xml = value; }
    }
    
    // Methods
    public override IPermission CreatePermission ()
    {
      return null;     // Not used, used for inheritance from SecurityAttribute
    }

    private PermissionSet CreateFromXml (string xml) 
    {
#if !NET_2_1
      SecurityParser sp = new SecurityParser ();
      try {
        sp.LoadXml (xml);
      }
      catch (Mono.Xml.SmallXmlParserException xe) {
        throw new XmlSyntaxException (xe.Line, xe.ToString ());
      }
      SecurityElement se = sp.ToXml ();

      string className = se.Attribute ("class");
      if (className == null)
        return null;

      PermissionState state = PermissionState.None;
      if (CodeAccessPermission.IsUnrestricted (se))
        state = PermissionState.Unrestricted;

      if (className.EndsWith ("NamedPermissionSet")) {
        NamedPermissionSet nps = new NamedPermissionSet (se.Attribute ("Name"), state);
        nps.FromXml (se);
        return (PermissionSet) nps;
      }
      else if (className.EndsWith ("PermissionSet")) {
        PermissionSet ps = new PermissionSet (state);
        ps.FromXml (se);
        return ps;
      }
#endif
      return null;
    }

    public PermissionSet CreatePermissionSet ()
    {
      PermissionSet pset = null;
#if !NET_2_1
      if (this.Unrestricted)
        pset = new PermissionSet (PermissionState.Unrestricted);
      else {
        pset = new PermissionSet (PermissionState.None);
        if (name != null) {
          return PolicyLevel.CreateAppDomainLevel ().GetNamedPermissionSet (name);
        }
        else if (file != null) {
          Encoding e = ((isUnicodeEncoded) ? System.Text.Encoding.Unicode : System.Text.Encoding.ASCII);
          using (StreamReader sr = new StreamReader (file, e)) {
            pset = CreateFromXml (sr.ReadToEnd ());
          }
        }
        else if (xml != null) {
          pset = CreateFromXml (xml);
        }
        else if (hex != null) {
          // Unicode isn't supported
          //Encoding e = ((isUnicodeEncoded) ? System.Text.Encoding.Unicode : System.Text.Encoding.ASCII);
          Encoding e = System.Text.Encoding.ASCII;
          byte[] bin = CryptoConvert.FromHex (hex);
          pset = CreateFromXml (e.GetString (bin, 0, bin.Length));
        }
      }
#endif
      return pset;
    }
  }
}