authentication result update

IdentityServer.Application/CommandHandlers/AuthenticateUserHandler.cs

@@ -1,7 +1,9 @@
 using AutoMapper;
 using IdentityServer.Application.Commands;
 using IdentityServer.Application.Services;
+using IdentityServer.PublishedLanguage.Constants;
 using IdentityServer.PublishedLanguage.Dto;
+using IdentityServer.PublishedLanguage.Events;
 using MediatR;
 using Microsoft.Extensions.Logging;
 using System.Threading;
@@ -9,7 +11,7 @@ using System.Threading.Tasks;
 
 namespace IdentityServer.Application.CommandHandlers
 {
-    public class AuthenticateUserHandler : IRequestHandler<AuthenticateUser, Token>
+    public class AuthenticateUserHandler : IRequestHandler<AuthenticateUser, AuthenticateUserResult>
     {
         private readonly IUserService _userService;
         private readonly IMapper _mapper;
@@ -22,18 +24,19 @@ namespace IdentityServer.Application.CommandHandlers
             _logger = logger;
         }
 
-        public async Task<Token> Handle(AuthenticateUser command, CancellationToken cancellationToken)
+        public async Task<AuthenticateUserResult> Handle(AuthenticateUser command, CancellationToken cancellationToken)
         {
             var internalToken = await _userService.Authenticate(command.UserName, command.Password);
             if (internalToken == null)
             {
                 _logger.LogDebug($"Authentication failed for user '{command.UserName}'.");
-                return null;
+                return new AuthenticateUserResult() { Status = AuthenticationStatus.BAD_CREDENTIALS };
             }
 
             _logger.LogDebug($"Authentication succeeded for user '{command.UserName}'.");
             var token = _mapper.Map<Token>(internalToken);
-            return token;
+
+            return new AuthenticateUserResult() { Token = token, Status = AuthenticationStatus.SUCCESS };
         }
     }
 }

IdentityServer.Application/Commands/AuthenticateUser.cs

@@ -1,9 +1,9 @@
-using IdentityServer.PublishedLanguage.Dto;
+using IdentityServer.PublishedLanguage.Events;
 using NDB.Application.DataContracts;
 
 namespace IdentityServer.Application.Commands
 {
-    public class AuthenticateUser : Command<Token>
+    public class AuthenticateUser : Command<AuthenticateUserResult>
     {
         public string UserName { get; set; }
         public string Password { get; set; }

IdentityServer.PublishedLanguage/Constants/AuthenticationStatus.cs

@@ -0,0 +1,9 @@
+namespace IdentityServer.PublishedLanguage.Constants
+{
+    public struct AuthenticationStatus
+    {
+        public const string
+            SUCCESS = "SUCCESS",
+            BAD_CREDENTIALS = "BAD_CREDENTIALS";
+    }
+}

IdentityServer.PublishedLanguage/Events/AuthenticateUserResult.cs

@@ -0,0 +1,10 @@
+using IdentityServer.PublishedLanguage.Dto;
+
+namespace IdentityServer.PublishedLanguage.Events
+{
+    public class AuthenticateUserResult
+    {
+        public Token Token { get; set; }
+        public string Status { get; set; }
+    }
+}