StrongNameMembershipCondition.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Policy / StrongNameMembershipCondition.cs / 1305376 / 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;
    using System.Diagnostics.Contracts; 

 
    [Serializable] 
    [System.Runtime.InteropServices.ComVisible(true)]
    sealed public class StrongNameMembershipCondition : IMembershipCondition, IConstantMembershipCondition, IReportMatchMembershipCondition 
    {
        //------------------------------------------------------
        //
        // 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" ) ); 
            Contract.EndContractBlock();
 
            m_publicKeyBlob = blob; 
            m_name = name;
            m_version = version; 
        }

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

        public StrongNamePublicKeyBlob PublicKey 
        {
            set
            {
                if (value == null) 
                    throw new ArgumentNullException( "PublicKey" );
                Contract.EndContractBlock(); 
 
                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 )
        {
            object usedEvidence = null;
            return (this as IReportMatchMembershipCondition).Check(evidence, out usedEvidence); 
        }
 
        bool IReportMatchMembershipCondition.Check(Evidence evidence, out object usedEvidence) 
        {
            usedEvidence = null; 

            if (evidence == null)
                return false;
 
            StrongName name = evidence.GetDelayEvaluatedHostEvidence();
            if (name != null) 
            { 
                bool publicKeyMatch = PublicKey != null && PublicKey.Equals(name.PublicKey);
                bool nameMatch = Name == null || (name.Name != null && StrongName.CompareNames(name.Name, Name)); 
                bool versionMatch = (object)Version == null || ((object)name.Version != null && name.Version.CompareTo(Version) == 0);

                if (publicKeyMatch && nameMatch && versionMatch)
                { 
                    // Note that we explicitly do not want to mark the strong name evidence as used at
                    // this point, since we could be a child code group where our parent provides more 
                    // trust than we do.  For instance, if we're in a setup like this: 
                    //
                    //   AllCode -> FullTrust 
                    //     StrongName -> FullTrust
                    //
                    // the StrongName code group didn't add anything to the final grant set and therefore
                    // does not need to be evaluated. 
                    usedEvidence = name;
                    return true; 
                } 
            }
 
            return false;
        }

        private const String s_tagName = "Name"; 
        private const String s_tagVersion = "AssemblyVersion";
        private const String s_tagPublicKeyBlob = "PublicKeyBlob"; 
 
        public IMembershipCondition Copy()
        { 
            return new StrongNameMembershipCondition( PublicKey,
                                                      Name,
                                                      Version);
        } 

 
        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. 
            Contract.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" ) );
            }
            Contract.EndContractBlock(); 

            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(); 
                }
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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