StrongNameMembershipCondition.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 / Policy / StrongNameMembershipCondition.cs / 1 / StrongNameMembershipCondition.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//  StrongNameMembershipCondition.cs
// 
//  Implementation of membership condition for zones 
//
 
namespace System.Security.Policy {
    using System.Text;
    using System.Configuration.Assemblies;
    using System; 
    using SecurityManager = System.Security.SecurityManager;
    using StrongNamePublicKeyBlob = System.Security.Permissions.StrongNamePublicKeyBlob; 
    using PermissionSet = System.Security.PermissionSet; 
    using SecurityElement = System.Security.SecurityElement;
    using System.Collections; 
    using System.Globalization;


    [Serializable] 
[System.Runtime.InteropServices.ComVisible(true)]
    sealed public class StrongNameMembershipCondition : IMembershipCondition, IConstantMembershipCondition 
    { 
        //------------------------------------------------------
        // 
        // PRIVATE STATE DATA
        //
        //-----------------------------------------------------
 
        private StrongNamePublicKeyBlob m_publicKeyBlob;
        private String m_name; 
        private Version m_version; 
        private SecurityElement m_element;
 
        //-----------------------------------------------------
        //
        // PUBLIC CONSTRUCTORS
        // 
        //-----------------------------------------------------
 
        internal StrongNameMembershipCondition() 
        {
        } 

        public StrongNameMembershipCondition( StrongNamePublicKeyBlob blob,
                                              String name,
                                              Version version ) 
        {
            if (blob == null) 
                throw new ArgumentNullException( "blob" ); 

            if (name != null && name.Equals( "" )) 
                throw new ArgumentException( Environment.GetResourceString( "Argument_EmptyStrongName" ) );

            m_publicKeyBlob = blob;
            m_name = name; 
            m_version = version;
        } 
 
        //------------------------------------------------------
        // 
        // PUBLIC ACCESSOR METHODS
        //
        //-----------------------------------------------------
 
        public StrongNamePublicKeyBlob PublicKey
        { 
            set 
            {
                if (value == null) 
                    throw new ArgumentNullException( "PublicKey" );

                m_publicKeyBlob = value;
            } 

            get 
            { 
                if (m_publicKeyBlob == null && m_element != null)
                    ParseKeyBlob(); 

                return m_publicKeyBlob;
            }
        } 

        public String Name 
        { 
            set
            { 
                if (value == null)
                {
                    if (m_publicKeyBlob == null && m_element != null)
                        ParseKeyBlob(); 

                    if ((Object) m_version == null && m_element != null) 
                        ParseVersion(); 

                    m_element = null; 
                }
                else if (value.Length == 0)
                    throw new ArgumentException( Environment.GetResourceString("Argument_EmptyName" ));
 
                m_name = value;
            } 
 
            get
            { 
                if (m_name == null && m_element != null)
                    ParseName();

                return m_name; 
            }
        } 
 
        public Version Version
        { 
            set
            {
                if (value == null)
                { 
                    if (m_name == null && m_element != null)
                        ParseName(); 
 
                    if (m_publicKeyBlob == null && m_element != null)
                        ParseKeyBlob(); 

                    m_element = null;
                }
 
                m_version = value;
            } 
 
            get
            { 
                if ((Object) m_version == null && m_element != null)
                    ParseVersion();

                return m_version; 
            }
        } 
 
        //------------------------------------------------------
        // 
        // IMEMBERSHIPCONDITION IMPLEMENTATION
        //
        //------------------------------------------------------
 
        public bool Check( Evidence evidence )
        { 
            if (evidence == null) 
                return false;
 
            IEnumerator enumerator = evidence.GetHostEnumerator();
            while (enumerator.MoveNext())
            {
                if (enumerator.Current is StrongName) 
                {
                    StrongName name = (StrongName)enumerator.Current; 
 
                    if (( this.PublicKey != null && this.PublicKey.Equals( name.PublicKey ) ) &&
                        ( this.Name == null || (name.Name != null && StrongName.CompareNames( name.Name, this.Name ) )) && 
                        ( (Object) this.Version == null || ((Object) name.Version != null && name.Version.CompareTo( this.Version ) == 0 )))
                    {
                        return true;
                    } 
                }
            } 
            return false; 
        }
 
        public IMembershipCondition Copy()
        {
            return new StrongNameMembershipCondition( PublicKey,
                                                      Name, 
                                                      Version);
        } 
 
        private const String s_tagName = "Name";
        private const String s_tagVersion = "AssemblyVersion"; 
        private const String s_tagPublicKeyBlob = "PublicKeyBlob";

        public SecurityElement ToXml()
        { 
            return ToXml( null );
        } 
 
        public void FromXml( SecurityElement e )
        { 
            FromXml( e, null );
        }

        public SecurityElement ToXml( PolicyLevel level ) 
        {
            SecurityElement root = new SecurityElement( "IMembershipCondition" ); 
            System.Security.Util.XMLUtil.AddClassAttribute( root, this.GetType(), "System.Security.Policy.StrongNameMembershipCondition" ); 
            // If you hit this assert then most likely you are trying to change the name of this class.
            // This is ok as long as you change the hard coded string above and change the assert below. 
            BCLDebug.Assert( this.GetType().FullName.Equals( "System.Security.Policy.StrongNameMembershipCondition" ), "Class name changed!" );

            root.AddAttribute( "version", "1" );
 
            if (PublicKey != null)
                root.AddAttribute( s_tagPublicKeyBlob, System.Security.Util.Hex.EncodeHexString( PublicKey.PublicKey ) ); 
 
            if (Name != null)
                root.AddAttribute( s_tagName, Name ); 

            if ((Object) Version != null)
                root.AddAttribute( s_tagVersion, Version.ToString() );
 
            return root;
 
        } 

        public void FromXml( SecurityElement e, PolicyLevel level ) 
        {
            if (e == null)
                throw new ArgumentNullException("e");
 
            if (!e.Tag.Equals( "IMembershipCondition" ))
            { 
                throw new ArgumentException( Environment.GetResourceString( "Argument_MembershipConditionElement" ) ); 
            }
 
            lock (this)
            {
                m_name = null;
                m_publicKeyBlob = null; 
                m_version = null;
                m_element = e; 
            } 
        }
 

        private void ParseName()
        {
            lock (this) 
            {
                if (m_element == null) 
                    return; 

                String elSite = m_element.Attribute( s_tagName ); 
                m_name = elSite == null ? null : elSite;

                if ((Object) m_version != null && m_name != null && m_publicKeyBlob != null)
                { 
                    m_element = null;
                } 
            } 
        }
 
        private void ParseKeyBlob()
        {
            lock (this)
            { 
                if (m_element == null)
                    return; 
 
                String elBlob = m_element.Attribute( s_tagPublicKeyBlob );
                StrongNamePublicKeyBlob publicKeyBlob = new StrongNamePublicKeyBlob(); 

                if (elBlob != null)
                    publicKeyBlob.PublicKey = System.Security.Util.Hex.DecodeHexString( elBlob );
                else 
                    throw new ArgumentException( Environment.GetResourceString( "Argument_BlobCannotBeNull" ) );
 
                m_publicKeyBlob = publicKeyBlob; 

                if ((Object) m_version != null && m_name != null && m_publicKeyBlob != null) 
                {
                    m_element = null;
                }
            } 
        }
 
        private void ParseVersion() 
        {
            lock (this) 
            {
                if (m_element == null)
                    return;
 
                String elVersion = m_element.Attribute( s_tagVersion );
                m_version = elVersion == null ? null : new Version( elVersion ); 
 
                if ((Object) m_version != null && m_name != null && m_publicKeyBlob != null)
                { 
                    m_element = null;
                }
            }
        } 

        public override String ToString() 
        { 
            String sName = "";
            String sVersion = ""; 

            if (Name != null)
                sName = " " + String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "StrongName_Name" ), Name );
 
            if ((Object) Version != null)
                sVersion = " " + String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "StrongName_Version" ), Version ); 
 
            return String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString( "StrongName_ToString" ), System.Security.Util.Hex.EncodeHexString( PublicKey.PublicKey ), sName, sVersion );
        } 

        public override bool Equals( Object o )
        {
            StrongNameMembershipCondition that = (o as StrongNameMembershipCondition); 

            if (that != null) 
            { 
                if (this.m_publicKeyBlob == null && this.m_element != null)
                    this.ParseKeyBlob(); 
                if (that.m_publicKeyBlob == null && that.m_element != null)
                    that.ParseKeyBlob();

                if (Equals( this.m_publicKeyBlob, that.m_publicKeyBlob )) 
                {
                    if (this.m_name == null && this.m_element != null) 
                        this.ParseName(); 
                    if (that.m_name == null && that.m_element != null)
                        that.ParseName(); 

                    if (Equals( this.m_name, that.m_name ))
                    {
                        if (this.m_version == null && this.m_element != null) 
                            this.ParseVersion();
                        if (that.m_version == null && that.m_element != null) 
                            that.ParseVersion(); 

                        if ( Equals( this.m_version, that.m_version )) 
                        {
                            return true;
                        }
                    } 
                }
            } 
            return false; 
        }
 
        public override int GetHashCode()
        {
            if (m_publicKeyBlob == null && m_element != null)
                ParseKeyBlob(); 

            if (m_publicKeyBlob != null) 
            { 
                return m_publicKeyBlob.GetHashCode();
            } 
            else
            {
                if (m_name == null && m_element != null)
                    ParseName(); 
                if (m_version == null && m_element != null)
                    ParseVersion(); 
 
                if (m_name != null || m_version != null)
                { 
                    return (m_name == null ? 0 : m_name.GetHashCode()) + (m_version == null ? 0 : m_version.GetHashCode());
                }
                else
                { 
                    return typeof( StrongNameMembershipCondition ).GetHashCode();
                } 
            } 
        }
    } 
}

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