SpringUserUtils.java

package eu.europeana.cloud.service.aas.authentication;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;

/**
 * Utility class containing function for spring security usage.
 * 
 * @author Markus Muhr (markus.muhr@theeuropeanlibrary.org)
 */
public final class SpringUserUtils {
    /**
     * @return Name of the currently logged in user
     */
    public static String getUsername() {
        String username = null;
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        if (auth != null) {
            if (auth.getPrincipal() instanceof UserDetails) {
                username = ((UserDetails) auth.getPrincipal()).getUsername();
            } else {
                username = auth.getPrincipal().toString();
            }
        }
        return username;
    }
}