URLIdentityPermission.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Permissions / URLIdentityPermission.cs / 1 / URLIdentityPermission.cs

                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// UrlIdentityPermission.cs
// 
 
namespace System.Security.Permissions
{ 
    using System;
    using SecurityElement = System.Security.SecurityElement;
    using System.Security.Util;
    using System.IO; 
    using System.Text;
    using System.Collections; 
    using System.Globalization; 
    using System.Runtime.Serialization;
 
[System.Runtime.InteropServices.ComVisible(true)]
    [Serializable] sealed public class UrlIdentityPermission : CodeAccessPermission, IBuiltInPermission
    {
        //------------------------------------------------------ 
        //
        // PRIVATE STATE DATA 
        // 
        //-----------------------------------------------------
 
        [OptionalField(VersionAdded = 2)]
        private bool m_unrestricted;
        [OptionalField(VersionAdded = 2)]
        private URLString[] m_urls; 

        // This field will be populated only for non X-AD scenarios where we create a XML-ised string of the Permission 
        [OptionalField(VersionAdded = 2)] 
        private String m_serializedPermission;
 
        //  This field is legacy info from v1.x and is never used in v2.0 and beyond: purely for serialization purposes
        private URLString m_url;

 
        [OnDeserialized]
        private void OnDeserialized(StreamingContext ctx) 
        { 
            // v2.0 and beyond XML case
            if (m_serializedPermission != null) 
            {
                FromXml(SecurityElement.FromString(m_serializedPermission));
                m_serializedPermission = null;
            } 
            else if (m_url != null) //v1.x case where we read the m_site value
            { 
                m_unrestricted = false; 
                m_urls = new URLString[1];
                m_urls[0] = m_url; 
                m_url = null;
            }

        } 

        [OnSerializing] 
        private void OnSerializing(StreamingContext ctx) 
        {
 
            if ((ctx.State & ~(StreamingContextStates.Clone|StreamingContextStates.CrossAppDomain)) != 0)
            {
                m_serializedPermission = ToXml().ToString(); //for the v2 and beyond case
                if (m_urls != null && m_urls.Length == 1) // for the v1.x case 
                    m_url = m_urls[0];
 
            } 
        }
        [OnSerialized] 
        private void OnSerialized(StreamingContext ctx)
        {
            if ((ctx.State & ~(StreamingContextStates.Clone|StreamingContextStates.CrossAppDomain)) != 0)
            { 
                m_serializedPermission = null;
                m_url = null; 
            } 
        }
 

        //-----------------------------------------------------
        //
        // PUBLIC CONSTRUCTORS 
        //
        //----------------------------------------------------- 
 

        public UrlIdentityPermission(PermissionState state) 
        {
            if (state == PermissionState.Unrestricted)
            {
                if(CodeAccessSecurityEngine.DoesFullTrustMeanFullTrust()) 
                    m_unrestricted = true;
                else 
                    throw new ArgumentException(Environment.GetResourceString("Argument_UnrestrictedIdentityPermission")); 
            }
            else if (state == PermissionState.None) 
            {
                m_unrestricted = false;
            }
            else 
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState")); 
            } 
        }
 
        public UrlIdentityPermission( String site )
        {
            if (site == null)
                throw new ArgumentNullException( "site" ); 
            Url = site;
        } 
 
        internal UrlIdentityPermission( URLString site )
        { 
            m_unrestricted = false;
            m_urls = new URLString[1];
            m_urls[0] = site;
        } 

        //------------------------------------------------------ 
        // 
        // PUBLIC ACCESSOR METHODS
        // 
        //-----------------------------------------------------

        public String Url
        { 
            set
            { 
                m_unrestricted = false; 
                if(value == null || value.Length == 0)
                    m_urls = null; 
                else
                {
                    m_urls = new URLString[1];
                    m_urls[0] = new URLString( value ); 
                }
            } 
 
            get
            { 
                if(m_urls == null)
                    return "";
                if(m_urls.Length == 1)
                    return m_urls[0].ToString(); 
                throw new NotSupportedException(Environment.GetResourceString("NotSupported_AmbiguousIdentity"));
            } 
        } 

        //------------------------------------------------------ 
        //
        // PRIVATE AND PROTECTED HELPERS FOR ACCESSORS AND CONSTRUCTORS
        //
        //------------------------------------------------------ 

        //----------------------------------------------------- 
        // 
        // CODEACCESSPERMISSION IMPLEMENTATION
        // 
        //------------------------------------------------------

        //-----------------------------------------------------
        // 
        // IPERMISSION IMPLEMENTATION
        // 
        //----------------------------------------------------- 

 
        public override IPermission Copy()
        {
            UrlIdentityPermission perm = new UrlIdentityPermission( PermissionState.None );
            perm.m_unrestricted = this.m_unrestricted; 
            if (this.m_urls != null)
            { 
                perm.m_urls = new URLString[this.m_urls.Length]; 
                int n;
                for(n = 0; n < this.m_urls.Length; n++) 
                    perm.m_urls[n] = (URLString)this.m_urls[n].Copy();
            }
            return perm;
        } 

        public override bool IsSubsetOf(IPermission target) 
        { 
            if (target == null)
            { 
                if(m_unrestricted)
                    return false;
                if(m_urls == null)
                    return true; 
                if(m_urls.Length == 0)
                    return true; 
                return false; 
            }
            UrlIdentityPermission that = target as UrlIdentityPermission; 
            if(that == null)
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName));
            if(that.m_unrestricted)
                return true; 
            if(m_unrestricted)
                return false; 
            if(this.m_urls != null) 
            {
                foreach(URLString usThis in this.m_urls) 
                {
                    bool bOK = false;
                    if(that.m_urls != null)
                    { 
                        foreach(URLString usThat in that.m_urls)
                        { 
                            if(usThis.IsSubsetOf(usThat)) 
                            {
                                bOK = true; 
                                break;
                            }
                        }
                    } 
                    if(!bOK)
                        return false; 
                } 
            }
            return true; 
        }

        public override IPermission Intersect(IPermission target)
        { 
            if (target == null)
                return null; 
            UrlIdentityPermission that = target as UrlIdentityPermission; 
            if(that == null)
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName)); 
            if(this.m_unrestricted && that.m_unrestricted)
            {
                UrlIdentityPermission res = new UrlIdentityPermission(PermissionState.None);
                res.m_unrestricted = true; 
                return res;
            } 
            if(this.m_unrestricted) 
                return that.Copy();
            if(that.m_unrestricted) 
                return this.Copy();
            if(this.m_urls == null || that.m_urls == null || this.m_urls.Length == 0 || that.m_urls.Length == 0)
                return null;
            ArrayList alUrls = new ArrayList(); 
            foreach(URLString usThis in this.m_urls)
            { 
                foreach(URLString usThat in that.m_urls) 
                {
                    URLString usInt = (URLString)usThis.Intersect(usThat); 
                    if(usInt != null)
                        alUrls.Add(usInt);
                }
            } 
            if(alUrls.Count == 0)
                return null; 
            UrlIdentityPermission result = new UrlIdentityPermission(PermissionState.None); 
            result.m_urls = (URLString[])alUrls.ToArray(typeof(URLString));
            return result; 
        }

        public override IPermission Union(IPermission target)
        { 
            if (target == null)
            { 
                if((this.m_urls == null || this.m_urls.Length == 0) && !this.m_unrestricted) 
                    return null;
                return this.Copy(); 
            }
            UrlIdentityPermission that = target as UrlIdentityPermission;
            if(that == null)
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName)); 
            if(this.m_unrestricted || that.m_unrestricted)
            { 
                UrlIdentityPermission res = new UrlIdentityPermission(PermissionState.None); 
                res.m_unrestricted = true;
                return res; 
            }
            if (this.m_urls == null || this.m_urls.Length == 0)
            {
                if(that.m_urls == null || that.m_urls.Length == 0) 
                    return null;
                return that.Copy(); 
            } 
            if(that.m_urls == null || that.m_urls.Length == 0)
                return this.Copy(); 
            ArrayList alUrls = new ArrayList();
            foreach(URLString usThis in this.m_urls)
                alUrls.Add(usThis);
            foreach(URLString usThat in that.m_urls) 
            {
                bool bDupe = false; 
                foreach(URLString us in alUrls) 
                {
                    if(usThat.Equals(us)) 
                    {
                        bDupe = true;
                        break;
                    } 
                }
                if(!bDupe) 
                    alUrls.Add(usThat); 
            }
            UrlIdentityPermission result = new UrlIdentityPermission(PermissionState.None); 
            result.m_urls = (URLString[])alUrls.ToArray(typeof(URLString));
            return result;
        }
 
        public override void FromXml(SecurityElement esd)
        { 
            m_unrestricted = false; 
            m_urls = null;
            CodeAccessPermission.ValidateElement( esd, this ); 
            String unr = esd.Attribute( "Unrestricted" );
            if(unr != null && String.Compare(unr, "true", StringComparison.OrdinalIgnoreCase) == 0)
            {
                m_unrestricted = true; 
                return;
            } 
            String elem = esd.Attribute( "Url" ); 
            ArrayList al = new ArrayList();
            if(elem != null) 
                al.Add(new URLString( elem, true ));
            ArrayList alChildren = esd.Children;
            if(alChildren != null)
            { 
                foreach(SecurityElement child in alChildren)
                { 
                    elem = child.Attribute( "Url" ); 
                    if(elem != null)
                        al.Add(new URLString( elem, true )); 
                }
            }
            if(al.Count != 0)
                m_urls = (URLString[])al.ToArray(typeof(URLString)); 
        }
 
        public override SecurityElement ToXml() 
        {
            SecurityElement esd = CodeAccessPermission.CreatePermissionElement( this, "System.Security.Permissions.UrlIdentityPermission" ); 
            if (m_unrestricted)
                esd.AddAttribute( "Unrestricted", "true" );
            else if (m_urls != null)
            { 
                if (m_urls.Length == 1)
                    esd.AddAttribute( "Url", m_urls[0].ToString() ); 
                else 
                {
                    int n; 
                    for(n = 0; n < m_urls.Length; n++)
                    {
                        SecurityElement child = new SecurityElement("Url");
                        child.AddAttribute( "Url", m_urls[n].ToString() ); 
                        esd.AddChild(child);
                    } 
                } 
            }
            return esd; 
        }

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

        internal static int GetTokenIndex() 
        {
            return BuiltInPermissionIndex.UrlIdentityPermissionIndex;
        }
    } 
}
                        

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