package com.bcxin.survey.controller.wechat;

import com.bcxin.survey.service.wechat.WechatService;
import com.bcxin.survey.wechat.utils.SignUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.transaction.annotation.Transactional;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;


/**
 * 与微信平台对接servlet
 * @author zhaofei
 *
 */
@Transactional
public class WechatServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long	serialVersionUID	= 1L;
	final static Logger logger = LoggerFactory.getLogger(WechatServlet.class);
	/** 
     * 确认请求来自微信服务器 
     */
	@Override
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// 微信加密签名  
        String signature = request.getParameter("signature");  
        // 时间戳  
        String timestamp = request.getParameter("timestamp");  
        // 随机数  
        String nonce = request.getParameter("nonce");  
        // 随机字符串  
        String echostr = request.getParameter("echostr");  
  
        PrintWriter out = response.getWriter();  
        // 通过检验signature对请求进行校验，若校验成功则原样返回echostr，表示接入成功，否则接入失败  
        if (SignUtil.checkSignature(signature, timestamp, nonce)) {  
            out.print(echostr);  
            logger.info("通过验证接入成功！");
        }  
        out.close();  
        out = null;  
	}

	/** 
     * 处理微信服务器发来的消息 
     */
	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// TODO 消息的接收、处理、响应  
		// 将请求、响应的编码均设置为UTF-8（防止中文乱码）  
        request.setCharacterEncoding("UTF-8");  
        response.setCharacterEncoding("UTF-8");  
  
        // 调用核心业务类接收消息、处理消息  
        String respMessage = WechatService.processRequest(request);  
          
        // 响应消息  
        PrintWriter out = response.getWriter();  
        out.print(respMessage);  
        out.close();  
    }  
 }