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Проверку пароля должен выполнять сервис (это избавит вас от необходимости два раза ходить в БД)

//store not encoded password bad practice, but it simple case for learning other things
if (userRepository.containsUser(orderRequestDto.getUserName(), orderRequestDto.getPassword())) {
//we already check existing of record, but of course that case has the meaning
user = userRepository.findByUserName(orderRequestDto.getUserName())
.orElseThrow(ItemNotFoundException::new);

Пользователь может посмотреть/отменить только свои запросы? Или все?

@Override
public OrderStatusResponseDto cancel(OrderStatusRequestDto orderStatusRequestDto) {
if (!userRepository.containsUser(orderStatusRequestDto.getUserName(), orderStatusRequestDto.getPassword())) {
throw new UserNotFoundException();
}
Order order = findById(orderStatusRequestDto.getOrderId());
order.setOrderStatus(OrderStatuses.CANCELLED);
Order updated = orderRepository.save(order)
.orElseThrow(ItemNotFoundException::new);
return OrderMapper.toOrderStatusResponseDto(updated);
}
@Override
public OrderStatusResponseDto getOrderStatus(OrderStatusRequestDto orderStatusRequestDto) {
return OrderMapper.toOrderStatusResponseDto(
findById(orderStatusRequestDto.getOrderId())
);
}

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