package com.fgkj.Filters;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.omg.CORBA.Request;

import com.fgkj.actions.ActionUtil;
import com.fgkj.dto.ServiceModel;

public class CrossDomainLimitFilter implements Filter{
	public static final int max_connect_count = 10;
	
	public final static String CROSS_DOMAIN_KEY	= "44c4a294cb66d13727c14b065dbe8548";		//跨域请求 key
		
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest)req;
		HttpServletResponse response =(HttpServletResponse)resp;
		String URL=request.getRequestURI();
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=utf-8");
		//检测跨域访问的请求
		if(URL != null && URL.endsWith("_ky") && false){
			String key = req.getParameter("key");										//获取校验码
			ServiceModel model = new ServiceModel();									
			boolean isAlowVisit = false;												//是否允许访问
			//System.out.println(key+"=="+CROSS_DOMAIN_KEY);
			if(key != null && CROSS_DOMAIN_KEY.equals(key)){
				isAlowCrossDomain(response);
				//System.out.println("开始休眠500毫秒秒");
				try {
					Thread.sleep(500);
				} catch (InterruptedException e) {
					e.printStackTrace();
				} finally{
					//System.out.println("休眠结束.....");
				}
				SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
				System.out.println("跨域访问域名或ip:"+request.getRemoteHost()+" At "+sdf.format(new Date()));
				
				isAlowVisit = true;
			}else{
				model.setMsg("校验码发送失败,key:"+key);
			}			
			if(isAlowVisit){
				//通过请求
				chain.doFilter(request, response);		//允许跨域
			}else{
				//不能放行的请求
				PrintWriter out = response.getWriter();
				out.write(ActionUtil.getGson().toJson(model));
				out.flush();
				out.close();
			}
		}else{
			//非跨域请求
			chain.doFilter(request, response);
			//SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			//System.out.println("非跨域请求不允许放行"+request.getRemoteHost()+" At "+sdf.format(new Date()));
		}
		
	}

	public void init(FilterConfig arg0) throws ServletException {
		
	}

	public void destroy() {
		
	}
	
	/**
	 * 允许跨域访问
	 * @param response
	 */
	public void isAlowCrossDomain(HttpServletResponse response){
		response.setHeader("Access-Control-Allow-Origin", "*");				//允许跨域访问
		response.setHeader("Access-Control-Allow-Headers", "X-Requested-With,content-type,token");
		response.setHeader("Access-Control-Allow-Methods", "GET, HEAD, POST, PUT, DELETE, TRACE, OPTIONS, PATCH");
	}
	
	public static void main(String[] args) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		System.out.println(sdf.format(new Date()));
	}
}