package com.dhx.bi.utils;

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

import java.lang.reflect.Field;

/**
 * @author adorabled4
 * @className AopUtil
 * @date : 2023/04/10/ 14:33
 **/
public class AopUtil{
    /**
     * 获取一个代理实例的真实对象
     * @param proxy
     * @return
     * @throws Exception
     */
    public static Object getTarget(Object proxy) throws Exception {
        if (!AopUtils.isAopProxy(proxy)) {
            return proxy;
        }
        if (AopUtils.isJdkDynamicProxy(proxy)) {
            /**JDK动态代理*/
            return getJdkDynamicProxyTargetObject(proxy);
        } else if(AopUtils.isCglibProxy(proxy)){
            /**cglib动态代理*/
            return getCglibProxyTargetObject(proxy);
        }
        return proxy;
    }
    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;
    }
}

