package org.marker.weixin.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 处理微信服务器请求的Servlet URL地址：http://xxx/weixin/dealwith.do
 * 
 * @author marker
 * @blog www.yl-blog.com
 * @weibo http://t.qq.com/wuweiit
 */
public class WinXinServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static Log log = LogFactory.getLog(WinXinServlet.class);

	// TOKEN 是你在微信平台开发模式中设置的字符串
	public static final String TOKEN = "YourToken";

	/**
	 * 处理微信服务器验证
	 * http://wallimn.iteye.com, 2014-09-11
	 */
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		String signature = request.getParameter("signature");// 微信加密签名
		String timestamp = request.getParameter("timestamp");// 时间戳
		String nonce = request.getParameter("nonce");// 随机数
		String echostr = request.getParameter("echostr");// 随机字符串
		Writer out = response.getWriter();
		System.out.println("收到验证请求：");
		System.out.println("　　signature="+signature);
		System.out.println("　　timestamp="+timestamp);
		System.out.println("　　nonce="+nonce);
		System.out.println("　　echostr="+echostr);
		if(signature==null || timestamp==null || nonce==null || echostr==null){
			//这几个参数为空时，排序会报错。
			out.write("parameter is null!");
		}
		else{
			// 重写totring方法，得到三个参数的拼接字符串
			List<String> list = new ArrayList<String>(3) {
				private static final long serialVersionUID = 2621444383666420433L;
				public String toString() {
					return this.get(0) + this.get(1) + this.get(2);
				}
			};
			list.add(TOKEN);
			list.add(timestamp);
			list.add(nonce);
			Collections.sort(list);// 排序
			String tmpStr = new MySecurity().encode(list.toString(),
					MySecurity.SHA_1);// SHA-1加密
			if (signature.equals(tmpStr)) {
				out.write(echostr);// 请求验证成功，返回随机码
			} else {
				out.write("check error!");
			}
		}
		out.flush();
		out.close();
	}

	
	/**
	 * 处理微信服务器发过来的各种消息，包括：文本、图片、地理位置、音乐等等
	 * http://wallimn.iteye.com, 2014-09-11
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		log.info("收到POST请求："+(new Date()));
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html; charset=utf-8");
		InputStream is = request.getInputStream();
		OutputStream os = response.getOutputStream();
		//TODO:写微信平台推送过来的各种信息的处理逻辑
	}
}