CustomAuthentication.cs

using CustomLogonXPOWeb.Module.BusinessObjects;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Security;
using DevExpress.Persistent.Base.Security;
using System;
using System.Collections.Generic;

namespace CustomLogonXPOWeb.Module.Security {
    public class CustomAuthentication : AuthenticationBase, IAuthenticationStandard {
        private CustomLogonParameters customLogonParameters;
        public CustomAuthentication() {
            customLogonParameters = new CustomLogonParameters();
        }
        public override void Logoff() {
            base.Logoff();
            customLogonParameters = new CustomLogonParameters();
        }
        public override void ClearSecuredLogonParameters() {
            customLogonParameters.Password = "";
            base.ClearSecuredLogonParameters();
        }
        public override object Authenticate(IObjectSpace objectSpace) {

            ApplicationUser applicationUser = objectSpace.FirstOrDefault<ApplicationUser>(e => e.UserName == customLogonParameters.UserName);

            if(applicationUser == null)
                throw new ArgumentNullException("ApplicationUser");

            if(!((IAuthenticationStandardUser)applicationUser).ComparePassword(customLogonParameters.Password))
                throw new AuthenticationException(
                    applicationUser.UserName, "Password mismatch.");

            return applicationUser;
        }

        public override void SetLogonParameters(object logonParameters) {
            this.customLogonParameters = (CustomLogonParameters)logonParameters;
        }

        public override IList<Type> GetBusinessClasses() {
            return new Type[] { typeof(CustomLogonParameters) };
        }
        public override bool AskLogonParametersViaUI {
            get { return true; }
        }
        public override object LogonParameters {
            get { return customLogonParameters; }
        }
        public override bool IsLogoffEnabled {
            get { return true; }
        }
    }
}