AuthenticationUtil.java

package fr.openwide.core.jpa.security.service;

import java.util.Collection;

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

import com.google.common.collect.ImmutableSet;

final class AuthenticationUtil {

	static Authentication getAuthentication() {
		return SecurityContextHolder.getContext().getAuthentication();
	}

	static void setAuthentication(Authentication authentication) {
		SecurityContextHolder.getContext().setAuthentication(authentication);
	}

	static boolean isLoggedIn() {
		return (getUserName() != null);
	}

	static String getUserName() {
		Authentication authentication = getAuthentication();
		if (authentication != null) {
			Object principal = authentication.getPrincipal();
			if (principal instanceof String) {
				return (String) principal;
			} else if (principal instanceof UserDetails) {
				return ((UserDetails) principal).getUsername();
			}
		}
		return null;
	}

	static Collection<? extends GrantedAuthority> getAuthorities() {
		Authentication authentication = getAuthentication();
		return authentication == null ? ImmutableSet.<GrantedAuthority>of() : authentication.getAuthorities();
	}

	private AuthenticationUtil() {
	}

}