spring-security/samples/chat-jc/src/main/java/sample/security/CurrentUser.java

/*
 * Copyright 2002-2013 the original author or authors.
 *
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */
package sample.security;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

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

/**
 * Annotate Spring MVC method arguments with this annotation to indicate you
 * wish to specify the argument with the value of the current
 * {@link Authentication#getPrincipal()} found on the
 * {@link SecurityContextHolder}.
 *
 * <p>
 * Creating your own annotation that uses {@link AuthenticationPrincipal} as a
 * meta annotation creates a layer of indirection between your code and Spring
 * Security's. For simplicity, you could instead use the
 * {@link AuthenticationPrincipal} directly.
 * </p>
 *
 * @author Rob Winch
 *
 */
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@AuthenticationPrincipal
public @interface CurrentUser {

}