var util = require('util'),
    colors = require('colors'),
    http = require('http'),
    httpProxy = require('./node_modules/http-proxy'),
    fs = require("fs");

var welcome = [
    '#    # ##### ##### #####        #####  #####   ####  #    # #   #',
    '#    #   #     #   #    #       #    # #    # #    #  #  #   # # ',
    '######   #     #   #    # ##### #    # #    # #    #   ##     #  ',
    '#    #   #     #   #####        #####  #####  #    #   ##     #  ',
    '#    #   #     #   #            #      #   #  #    #  #  #    #  ',
    '#    #   #     #   #            #      #    #  ####  #    #   #   '
].join('\n');

Date.prototype.Format = function(fmt) { //author: meizz
    var o = {
        "M+": this.getMonth() + 1, //月份
        "d+": this.getDate(), //日
        "h+": this.getHours(), //小时
        "m+": this.getMinutes(), //分
        "s+": this.getSeconds(), //秒
        "S": this.getMilliseconds() //毫秒
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
}

String.prototype.startWith=function(str){
    var reg=new RegExp("^"+str);
    return reg.test(this);
}

// 非法字符
var re = /php|exe|cmd|shell|select|union|delete|update|truncate|insert|eval|function/;
/** 这里配置转发
 */
var proxyPassConfig = {
    "/test": 'http://127.0.0.1:8080/hello',
    "/": "http://www.qingmiaokeji.cn/"
}

/**
 * ip 频繁访问限制策略
 * 2秒之内访问次数超过100，加入黑名单。
 * 可能存在并发问题
 * @constructor
 */
 function IPPolicy () {
    this.cache = {};
    this.blackIpList=[];
    var $this = this;
     setInterval (function () {
         var nowTime = new Date().getTime();
         for(ip in $this.cache){
            var item = $this.cache[ip];
            var timeDif = nowTime - item.visitTime;
            if(timeDif<2000 && item.count>100 ){
                $this.blackIpList.push(ip)
                delete  $this.cache[ip];
            }else{
                item.count = 0;
            }
         }
     },1000)
}
IPPolicy.prototype.addVisitIp = function (ip) {
    if(this.cache[ip]){
        this.cache[ip].count =  this.cache[ip].count+1;
        this.cache[ip].visitTime =new Date().getTime();
    }else{
        this.cache[ip] ={"ip":ip,"count":1,"visitTime":new Date().getTime()}
    }
}



var iPPolicy = new IPPolicy();


var logRootPath ="d:/httpproxy/";

console.log(welcome.rainbow.bold);





//
// Basic Http Proxy Server
//
var proxy = httpProxy.createProxyServer({});
var server = http.createServer(function (req, res) {
    appendLog(req)

    var ip = getClientIp(req)
    if(iPPolicy.blackIpList.indexOf(ip)>=0){
        console.log("ip在黑名单");
        backIpHandler(res)
        return
    }
    iPPolicy.addVisitIp(ip);


    var postData