ref: project structure

application/Auth/Commands/Login.cs

@@ -0,0 +1,34 @@
+using AutoMapper;
+using MediatR;
+using mws.backend.dotnet.application.Common;
+using mws.backend.dotnet.application.Users;
+
+namespace mws.backend.dotnet.application.Auth;
+
+public record LoginCommand(LoginRequest Request) : IRequest<LoginResponse>;
+
+public class LoginHandler(IUnitOfWork uow, IPasswordHasher passwordHasher, ITokenService tokenService, IMapper mapper)
+    : IRequestHandler<LoginCommand, LoginResponse>
+{
+    public async Task<LoginResponse> Handle(LoginCommand command, CancellationToken ct)
+    {
+        var username = command.Request.Username.Trim();
+        var user = await uow.Users.GetByUsernameWithRoleAsync(username, ct);
+
+        if (user is null || !passwordHasher.Verify(command.Request.Password, user.PasswordHash))
+        {
+            throw new UnauthorizedException("Invalid username or password");
+        }
+
+        if (!user.IsActive)
+        {
+            throw new ForbiddenException("Account disabled");
+        }
+
+        return new LoginResponse
+        {
+            Token = tokenService.CreateToken(user.Id, user.Username),
+            User = mapper.Map<UserDto>(user),
+        };
+    }
+}