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package com.webapp.utils.spring;

import java.lang.reflect.Field;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

public class AopTargetUtils {

    /*
     * 获取 目标对象
     * @param proxy 代理对象
     * @return -
     * @throws Exception
     */
    public static Object getTarget(Object proxy) {

        if(!AopUtils.isAopProxy(proxy)) {
            return proxy;//不是代理对象
        }
        try {
	        if(AopUtils.isJdkDynamicProxy(proxy)) {
				return getJdkDynamicProxyTargetObject(proxy);
	        } else { //cglib
	            return getCglibProxyTargetObject(proxy);
	        }
        } catch (Exception e) {
			e.printStackTrace();
		}
        return null;
    }

    private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
        Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
        h.setAccessible(true);
        Object dynamicAdvisedInterceptor = h.get(proxy);

        Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
        advised.setAccessible(true);

        Object target = ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();

        return target;
    }


    private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
        Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
        h.setAccessible(true);
        AopProxy aopProxy = (AopProxy) h.get(proxy);

        Field advised = aopProxy.getClass().getDeclaredField("advised");
        advised.setAccessible(true);

        Object target = ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();

        return target;
    }

}