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

//
// System.Security.Policy.FileCodeGroup
//
// Author(s):
//   Nick Drochak (ndrochak@gol.com)
//
// (C) 2001 Nick Drochak, All rights reserved.
// 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.Collections;
using System.Runtime.InteropServices;
using System.Security.Permissions;

namespace System.Security.Policy{

  [Serializable]
  [ComVisible (true)]
  public sealed class FileCodeGroup : CodeGroup {

    private FileIOPermissionAccess m_access;

    public FileCodeGroup (IMembershipCondition membershipCondition, FileIOPermissionAccess access) 
      : base (membershipCondition, null)
    {
      // note: FileIOPermissionAccess is a [Flag]
      m_access = access;
    }

    // for PolicyLevel (to avoid validation duplication)
    internal FileCodeGroup (SecurityElement e, PolicyLevel level)
      : base (e, level)
    {
    }

    public override CodeGroup Copy ()
    {
      FileCodeGroup copy = new FileCodeGroup (MembershipCondition, m_access);
      copy.Name = this.Name;
      copy.Description = this.Description;
      foreach (CodeGroup child in Children) {
        copy.AddChild (child.Copy ());  // deep copy
      }
      return copy;
    }
    
    public override string MergeLogic {
      get { return "Union";}
    }

    public override PolicyStatement Resolve (Evidence evidence)
    {
      if (null == evidence)
        throw new ArgumentNullException("evidence");

      if (!MembershipCondition.Check (evidence))
        return null;

      PermissionSet ps = null;
      if (this.PolicyStatement == null)
        ps = new PermissionSet (PermissionState.None);
      else
        ps = this.PolicyStatement.PermissionSet.Copy ();

      if (this.Children.Count > 0) {
        foreach (CodeGroup child_cg in this.Children) {
          PolicyStatement child_pst = child_cg.Resolve (evidence);
          if (child_pst != null) {
            ps = ps.Union (child_pst.PermissionSet);
          }
        }
      }

      PolicyStatement pst = null;
      if (this.PolicyStatement != null)
        pst = this.PolicyStatement.Copy ();
      else
        pst = PolicyStatement.Empty ();
      pst.PermissionSet = ps;
      return pst;
    }

    public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence)
    {
      if (null == evidence)
        throw new ArgumentNullException("evidence");

      if (!MembershipCondition.Check (evidence))
        return null;

      FileCodeGroup matchRoot = new FileCodeGroup (MembershipCondition, m_access);

      foreach (CodeGroup child in Children) {
        CodeGroup childMatchingCodeGroup = child.ResolveMatchingCodeGroups (evidence);
        if (childMatchingCodeGroup != null)
          matchRoot.AddChild (childMatchingCodeGroup);
      }

      return matchRoot;
    }

    public override string AttributeString {
      get { return null; }
    }

    public override string PermissionSetName {
      get { return "Same directory FileIO - " + m_access.ToString (); }
    }

    public override bool Equals (object o)
    {
      if (!(o is FileCodeGroup))
        return false;

      if (this.m_access != ((FileCodeGroup)o).m_access)
        return false;

      return Equals((CodeGroup)o, false);
    }

    public override int GetHashCode ()
    {
      return m_access.GetHashCode ();
    }

    protected override void ParseXml (SecurityElement e, PolicyLevel level)
    {
      string a = e.Attribute ("Access");
      if (a != null)
        m_access = (FileIOPermissionAccess) Enum.Parse (typeof (FileIOPermissionAccess), a, true);
      else
        m_access = FileIOPermissionAccess.NoAccess;
    }
    
    protected override void CreateXml (SecurityElement element, PolicyLevel level)
    {
      element.AddAttribute ("Access", m_access.ToString ());
    }
  }
}