SiteIdentityPermission.cs

using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security.Util;

namespace System.Security.Permissions
{
    [Serializable]
    [ComVisible(true)]
    public sealed class SiteIdentityPermission : CodeAccessPermission, IBuiltInPermission
    {
        [OptionalField(VersionAdded = 2)]
        private bool m_unrestricted;

        [OptionalField(VersionAdded = 2)]
        private SiteString[] m_sites;

        [OptionalField(VersionAdded = 2)]
        private string m_serializedPermission;

        private SiteString m_site;

        public string Site
        {
            get
            {
                if (m_sites == null)
                {
                    return "";
                }
                if (m_sites.Length == 1)
                {
                    return m_sites[0].ToString();
                }
                throw new NotSupportedException(Environment.GetResourceString("NotSupported_AmbiguousIdentity"));
            }
            set
            {
                m_unrestricted = false;
                m_sites = new SiteString[1];
                m_sites[0] = new SiteString(value);
            }
        }

        [OnDeserialized]
        private void OnDeserialized(StreamingContext ctx)
        {
            if (m_serializedPermission != null)
            {
                FromXml(SecurityElement.FromString(m_serializedPermission));
                m_serializedPermission = null;
            }
            else if (m_site != null)
            {
                m_unrestricted = false;
                m_sites = new SiteString[1];
                m_sites[0] = m_site;
                m_site = null;
            }
        }

        [OnSerializing]
        private void OnSerializing(StreamingContext ctx)
        {
            if ((ctx.State & ~(StreamingContextStates.Clone | StreamingContextStates.CrossAppDomain)) != 0)
            {
                m_serializedPermission = ToXml().ToString();
                if (m_sites != null && m_sites.Length == 1)
                {
                    m_site = m_sites[0];
                }
            }
        }

        [OnSerialized]
        private void OnSerialized(StreamingContext ctx)
        {
            if ((ctx.State & ~(StreamingContextStates.Clone | StreamingContextStates.CrossAppDomain)) != 0)
            {
                m_serializedPermission = null;
                m_site = null;
            }
        }

        public SiteIdentityPermission(PermissionState state)
        {
            switch (state)
            {
            case PermissionState.Unrestricted:
                m_unrestricted = true;
                break;
            case PermissionState.None:
                m_unrestricted = false;
                break;
            default:
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState"));
            }
        }

        public SiteIdentityPermission(string site)
        {
            Site = site;
        }

        public override IPermission Copy()
        {
            SiteIdentityPermission siteIdentityPermission = new SiteIdentityPermission(PermissionState.None);
            siteIdentityPermission.m_unrestricted = m_unrestricted;
            if (m_sites != null)
            {
                siteIdentityPermission.m_sites = new SiteString[m_sites.Length];
                for (int i = 0; i < m_sites.Length; i++)
                {
                    siteIdentityPermission.m_sites[i] = m_sites[i].Copy();
                }
            }
            return siteIdentityPermission;
        }

        public override bool IsSubsetOf(IPermission target)
        {
            if (target == null)
            {
                if (m_unrestricted)
                {
                    return false;
                }
                if (m_sites == null)
                {
                    return true;
                }
                if (m_sites.Length == 0)
                {
                    return true;
                }
                return false;
            }
            SiteIdentityPermission siteIdentityPermission = target as SiteIdentityPermission;
            if (siteIdentityPermission == null)
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", GetType().FullName));
            }
            if (siteIdentityPermission.m_unrestricted)
            {
                return true;
            }
            if (m_unrestricted)
            {
                return false;
            }
            if (m_sites != null)
            {
                SiteString[] sites = m_sites;
                foreach (SiteString siteString in sites)
                {
                    bool flag = false;
                    if (siteIdentityPermission.m_sites != null)
                    {
                        SiteString[] sites2 = siteIdentityPermission.m_sites;
                        foreach (SiteString operand in sites2)
                        {
                            if (siteString.IsSubsetOf(operand))
                            {
                                flag = true;
                                break;
                            }
                        }
                    }
                    if (!flag)
                    {
                        return false;
                    }
                }
            }
            return true;
        }

        public override IPermission Intersect(IPermission target)
        {
            if (target == null)
            {
                return null;
            }
            SiteIdentityPermission siteIdentityPermission = target as SiteIdentityPermission;
            if (siteIdentityPermission == null)
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", GetType().FullName));
            }
            if (m_unrestricted && siteIdentityPermission.m_unrestricted)
            {
                SiteIdentityPermission siteIdentityPermission2 = new SiteIdentityPermission(PermissionState.None);
                siteIdentityPermission2.m_unrestricted = true;
                return siteIdentityPermission2;
            }
            if (m_unrestricted)
            {
                return siteIdentityPermission.Copy();
            }
            if (siteIdentityPermission.m_unrestricted)
            {
                return Copy();
            }
            if (m_sites == null || siteIdentityPermission.m_sites == null || m_sites.Length == 0 || siteIdentityPermission.m_sites.Length == 0)
            {
                return null;
            }
            List<SiteString> list = new List<SiteString>();
            SiteString[] sites = m_sites;
            foreach (SiteString siteString in sites)
            {
                SiteString[] sites2 = siteIdentityPermission.m_sites;
                foreach (SiteString operand in sites2)
                {
                    SiteString siteString2 = siteString.Intersect(operand);
                    if (siteString2 != null)
                    {
                        list.Add(siteString2);
                    }
                }
            }
            if (list.Count == 0)
            {
                return null;
            }
            SiteIdentityPermission siteIdentityPermission3 = new SiteIdentityPermission(PermissionState.None);
            siteIdentityPermission3.m_sites = list.ToArray();
            return siteIdentityPermission3;
        }

        public override IPermission Union(IPermission target)
        {
            if (target == null)
            {
                if ((m_sites == null || m_sites.Length == 0) && !m_unrestricted)
                {
                    return null;
                }
                return Copy();
            }
            SiteIdentityPermission siteIdentityPermission = target as SiteIdentityPermission;
            if (siteIdentityPermission == null)
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", GetType().FullName));
            }
            if (m_unrestricted || siteIdentityPermission.m_unrestricted)
            {
                SiteIdentityPermission siteIdentityPermission2 = new SiteIdentityPermission(PermissionState.None);
                siteIdentityPermission2.m_unrestricted = true;
                return siteIdentityPermission2;
            }
            if (m_sites == null || m_sites.Length == 0)
            {
                if (siteIdentityPermission.m_sites == null || siteIdentityPermission.m_sites.Length == 0)
                {
                    return null;
                }
                return siteIdentityPermission.Copy();
            }
            if (siteIdentityPermission.m_sites == null || siteIdentityPermission.m_sites.Length == 0)
            {
                return Copy();
            }
            List<SiteString> list = new List<SiteString>();
            SiteString[] sites = m_sites;
            foreach (SiteString item in sites)
            {
                list.Add(item);
            }
            SiteString[] sites2 = siteIdentityPermission.m_sites;
            foreach (SiteString siteString in sites2)
            {
                bool flag = false;
                foreach (SiteString item2 in list)
                {
                    if (siteString.Equals(item2))
                    {
                        flag = true;
                        break;
                    }
                }
                if (!flag)
                {
                    list.Add(siteString);
                }
            }
            SiteIdentityPermission siteIdentityPermission3 = new SiteIdentityPermission(PermissionState.None);
            siteIdentityPermission3.m_sites = list.ToArray();
            return siteIdentityPermission3;
        }

        public override void FromXml(SecurityElement esd)
        {
            m_unrestricted = false;
            m_sites = null;
            CodeAccessPermission.ValidateElement(esd, this);
            string text = esd.Attribute("Unrestricted");
            if (text != null && string.Compare(text, "true", StringComparison.OrdinalIgnoreCase) == 0)
            {
                m_unrestricted = true;
                return;
            }
            string text2 = esd.Attribute("Site");
            List<SiteString> list = new List<SiteString>();
            if (text2 != null)
            {
                list.Add(new SiteString(text2));
            }
            ArrayList children = esd.Children;
            if (children != null)
            {
                foreach (SecurityElement item in children)
                {
                    text2 = item.Attribute("Site");
                    if (text2 != null)
                    {
                        list.Add(new SiteString(text2));
                    }
                }
            }
            if (list.Count != 0)
            {
                m_sites = list.ToArray();
            }
        }

        public override SecurityElement ToXml()
        {
            SecurityElement securityElement = CodeAccessPermission.CreatePermissionElement(this, "System.Security.Permissions.SiteIdentityPermission");
            if (m_unrestricted)
            {
                securityElement.AddAttribute("Unrestricted", "true");
            }
            else if (m_sites != null)
            {
                if (m_sites.Length == 1)
                {
                    securityElement.AddAttribute("Site", m_sites[0].ToString());
                }
                else
                {
                    for (int i = 0; i < m_sites.Length; i++)
                    {
                        SecurityElement securityElement2 = new SecurityElement("Site");
                        securityElement2.AddAttribute("Site", m_sites[i].ToString());
                        securityElement.AddChild(securityElement2);
                    }
                }
            }
            return securityElement;
        }

        int IBuiltInPermission.GetTokenIndex()
        {
            return GetTokenIndex();
        }

        internal static int GetTokenIndex()
        {
            return 11;
        }
    }
}