package fr.plil.sio.web.mvc;
  
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;

  import org.springframework.security.core.Authentication;

  import org.springframework.security.core.context.SecurityContextHolder;
  import org.springframework.security.core.userdetails.UserDetails;
  import org.springframework.stereotype.Service;
  
  @Service
  public class SecurityServiceImpl implements SecurityService{
  
      private static final Logger logger = LoggerFactory.getLogger(SecurityServiceImpl.class);
  
      @Override
      public String findLoggedInUsername() {

          Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
  
          if(authentication == null) {
              return null;

          }

  
          Object principal = authentication.getPrincipal();
  
          if (principal instanceof UserDetails) {
              return ((UserDetails)principal).getUsername();
          }
  

          logger.warn("cannot find logged user");

          return null;
      }
  }