package fr.ifremer.quadrige3.synchro.server.security;
   
   /*-
    * #%L
    * Quadrige3 Core :: Quadrige3 Synchro server
    * $Id:$
    * $HeadURL:$
    * %%
    * Copyright (C) 2017 Ifremer
   * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   * #L%
   */
  
  import org.springframework.security.core.Authentication;
  import org.springframework.security.core.context.SecurityContextHolder;
  
  public class SecurityContextHelper {
  
  	public static final String USER_ANONYMOUS = "anonymousUser";
  
  	public static final int USER_ID_ANONYMOUS = -1;
  
  	public static String getPrincipalUsername() {
  		QuadrigeUserDetails userDetails = getPrincipal();
  		if (userDetails == null) {
  			return null;
  		}
  		String username = userDetails.getUsername();
  		if (USER_ANONYMOUS.equals(username)) {
  			return null;
  		}
  		return username;
  	}
  
  	public static QuadrigeUserDetails getPrincipal() {
  		Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
  		if (authentication == null || authentication.getPrincipal() == null) {
  			return null;
  		}
  		Object principal = authentication.getPrincipal();
  		if (principal instanceof QuadrigeUserDetails) {
  			return (QuadrigeUserDetails) principal;
  		} else {
  			return null;
  		}
  	}
  
  	public static int getPrincipalUserId() {
  		QuadrigeUserDetails userDetails = getPrincipal();
  		if (userDetails != null) {
  			if (USER_ANONYMOUS.equals(userDetails.getUsername())) {
  				return USER_ID_ANONYMOUS;
  			}
  			return userDetails.getUserId();
  		}
  		return USER_ID_ANONYMOUS;
  	}
  
  	/**
  	 * @return true if user is authenticated not anonymously.
  	 */
  	public static boolean isAuthenticateNotAnonymous() {
  		return getPrincipalUsername() != null;
  	}
  
  	/**
  	 * @return true if user is authenticated.
  	 */
  	public static boolean isAuthenticate() {
  		return getPrincipal() != null;
  	}
  
  
  	/**
  	 * @return true if user is authenticated anonymously.
  	 */
  	public static boolean isAuthenticateAnonymous() {
  		return getPrincipalUserId() == USER_ID_ANONYMOUS;
  	}
  
  	public static boolean isAuthenticateAsAdmin() {
  		return isAuthenticate() && getPrincipal().isAdmin();
  	}
  }