CurrentUserUtil.java

/**
 * Copyright 2012-2013 Maciej Jaworski, Mariusz Kapcia, Paweł Kędzia, Mateusz Kubuszok
 *
 * <p>Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at</p> 
 * 
 * <p>http://www.apache.org/licenses/LICENSE-2.0</p>
 *
 * <p>Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.</p>
 */
package com.autoupdater.server.utils.authentication;

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

/**
 * Utility helpful in dealing with current user's authentication.
 */
public class CurrentUserUtil {
    /**
     * Returns current user's name or null if none authenticated;
     * 
     * @return username if available, null otherwise
     */
    public static String getUsername() {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        return authentication != null ? (String) authentication.getPrincipal() : null;
    }
}