smtppermission.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / smtppermission.cs / 1 / smtppermission.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Net.Mail { 
 
    using System.Collections;
    using System.Security; 
    using System.Security.Permissions;
    using System.Globalization;
    using System.Threading;
 
    /// 
    public enum SmtpAccess { None = 0, Connect = 1, ConnectToUnrestrictedPort = 2}; 
 

    ///  
    [   AttributeUsage( AttributeTargets.Method | AttributeTargets.Constructor |
                        AttributeTargets.Class  | AttributeTargets.Struct      |
                        AttributeTargets.Assembly,
                        AllowMultiple = true, Inherited = false )] 

    [Serializable] 
    public sealed class SmtpPermissionAttribute: CodeAccessSecurityAttribute 
    {
        private const string strAccess     = "Access"; 
        private string  access = null;


        ///  
        public SmtpPermissionAttribute(SecurityAction action): base( action )
        { 
        } 

 
        public string Access {
            get{
                return access;
            } 
            set{
                access = value; 
            } 
        }
 
        /// 
        public override IPermission CreatePermission()
        {
            SmtpPermission perm = null; 
            if (Unrestricted) {
                perm = new SmtpPermission(PermissionState.Unrestricted); 
            } 
            else {
                perm = new SmtpPermission(PermissionState.None); 
                if (access != null) {
                    if (0 == string.Compare(access, "Connect", StringComparison.OrdinalIgnoreCase)) {
                        perm.AddPermission(SmtpAccess.Connect);
                    } 
                    else if (0 == string.Compare(access, "ConnectToUnrestrictedPort", StringComparison.OrdinalIgnoreCase)) {
                        perm.AddPermission(SmtpAccess.ConnectToUnrestrictedPort); 
                    } 
                    else if (0 == string.Compare(access, "None", StringComparison.OrdinalIgnoreCase)) {
                        perm.AddPermission(SmtpAccess.None); 
                    }
                    else {
                        throw new ArgumentException(SR.GetString(SR.net_perm_invalid_val, strAccess, access));
                    } 
                }
            } 
            return perm; 
        }
 
    }


 
    /// 
    [Serializable] 
    public sealed class SmtpPermission: CodeAccessPermission, IUnrestrictedPermission { 

        SmtpAccess access; 
        private bool unrestricted;

        /// 
        public SmtpPermission(PermissionState state) { 
            if (state == PermissionState.Unrestricted){
                access = SmtpAccess.ConnectToUnrestrictedPort; 
                unrestricted = true; 
            }
            else{ 
                access = SmtpAccess.None;
            }
        }
 
        public SmtpPermission(bool unrestricted) {
            if (unrestricted){ 
                access = SmtpAccess.ConnectToUnrestrictedPort; 
                this.unrestricted = true;
            } 
            else{
                access = SmtpAccess.None;
            }
        } 

 
 
        /// 
        public SmtpPermission(SmtpAccess access) { 
            this.access = access;
        }

        public SmtpAccess Access { 
            get{
                return access; 
            } 
        }
 
        /// 
        public void AddPermission(SmtpAccess access) {
            if (access > this.access)
                this.access = access; 
        }
 
        ///  
        public bool IsUnrestricted() {
            return unrestricted; 
        }

        /// 
        public override IPermission Copy() { 
            if(unrestricted){
                return new SmtpPermission(true); 
            } 
            return new SmtpPermission(access);
        } 

        /// 
        public override IPermission Union(IPermission target) {
            if (target==null) { 
                return this.Copy();
            } 
            SmtpPermission other = target as SmtpPermission; 
            if(other == null) {
                throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); 
            }

            if(unrestricted || other.IsUnrestricted()){
                return new SmtpPermission(true); 
            }
 
            return new SmtpPermission(this.access > other.access ? this.access : other.access); 
        }
 
        /// 
        public override IPermission Intersect(IPermission target) {
            if (target == null) {
                return null; 
            }
 
            SmtpPermission other = target as SmtpPermission; 
            if(other == null) {
                throw new ArgumentException(SR.GetString(SR.net_perm_target), "target"); 
            }

            if(IsUnrestricted() && other.IsUnrestricted()){
                return new SmtpPermission(true); 
            }
 
            return new SmtpPermission(this.access < other.access ? this.access : other.access); 
        }
 
        /// 
        public override bool IsSubsetOf(IPermission target) {
            // Pattern suggested by security engine
            if (target == null) { 
                return (access == SmtpAccess.None);
            } 
 
            SmtpPermission other = target as SmtpPermission;
            if (other == null) { 
                throw new ArgumentException(SR.GetString(SR.net_perm_target), "target");
            }

            if(unrestricted && !other.IsUnrestricted()){ 
                return false;
            } 
 
            return (other.access >= access);
        } 

        /// 
        public override void FromXml(SecurityElement securityElement) {
            if (securityElement == null) { 
               throw new ArgumentNullException("securityElement");
            } 
            if (!securityElement.Tag.Equals("IPermission")) { 
                throw new ArgumentException(SR.GetString(SR.net_not_ipermission), "securityElement");
            } 

            string className = securityElement.Attribute("class");

            if (className == null) { 
                throw new ArgumentException(SR.GetString(SR.net_no_classname), "securityElement");
            } 
            if (className.IndexOf(this.GetType().FullName) < 0) { 
                throw new ArgumentException(SR.GetString(SR.net_no_typename), "securityElement");
            } 

            String str = securityElement.Attribute("Unrestricted");
            if (str != null) {
                if (0 == string.Compare( str, "true", StringComparison.OrdinalIgnoreCase)){ 
                    access = SmtpAccess.ConnectToUnrestrictedPort;
                    unrestricted = true; 
                    return; 
                }
            } 

            str = securityElement.Attribute("Access");
            if (str != null) {
               if(0 == string.Compare(str, "Connect", StringComparison.OrdinalIgnoreCase)){ 
                   access = SmtpAccess.Connect;
               } 
               else if(0 == string.Compare(str, "ConnectToUnrestrictedPort", StringComparison.OrdinalIgnoreCase)){ 
                   access = SmtpAccess.ConnectToUnrestrictedPort;
               } 
               else if(0 == string.Compare(str, "None", StringComparison.OrdinalIgnoreCase)){
                   access = SmtpAccess.None;
               }
               else{ 
                   throw new ArgumentException(SR.GetString(SR.net_perm_invalid_val_in_element), "Access");
               } 
            } 
        }
 
        /// 
        public override SecurityElement ToXml() {

            SecurityElement securityElement = new SecurityElement( "IPermission" ); 

            securityElement.AddAttribute("class", this.GetType().FullName + ", " + this.GetType().Module.Assembly.FullName.Replace( '\"', '\'' )); 
            securityElement.AddAttribute("version", "1"); 

            if(unrestricted){ 
                securityElement.AddAttribute("Unrestricted", "true");
                return securityElement;
            }
 
            if (access == SmtpAccess.Connect) {
                securityElement.AddAttribute("Access", "Connect"); 
            } 
            else if (access == SmtpAccess.ConnectToUnrestrictedPort) {
                securityElement.AddAttribute("Access", "ConnectToUnrestrictedPort"); 
            }
            return securityElement;
        }
    }// class SmtpPermission 

 
} // namespace System.Net
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smtppermission.cs source code in C# .NET

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