Nodejs做整站转发

var b = function (a, b) {
	for (var d = 0; d < b.length - 2; d += 3) {
		var c = b.charAt(d + 2),
			c = "a" <= c ? c.charCodeAt(0) - 87 : Number(c),
			c = "+" == b.charAt(d + 1) ? a >>> c : a << c;
		a = "+" == b.charAt(d) ? a + c & 4294967295 : a ^ c
	}
	return a
}

var gettk =  function (a,TKK) {
	//console.log(a,TKK);
	for (var e = TKK.split("."), h = Number(e[0]) || 0, g = [], d = 0, f = 0; f < a.length; f++) {
		var c = a.charCodeAt(f);
		128 > c ? g[d++] = c : (2048 > c ? g[d++] = c >> 6 | 192 : (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charCodeAt(f + 1) & 64512) ? (c = 65536 + ((c & 1023) << 10) + (a.charCodeAt(++f) & 1023), g[d++] = c >> 18 | 240, g[d++] = c >> 12 & 63 | 128) : g[d++] = c >> 12 | 224, g[d++] = c >> 6 & 63 | 128), g[d++] = c & 63 | 128)
	}
	a = h;
	for (d = 0; d < g.length; d++) a += g[d], a = b(a, "+-a^+6");
	a = b(a, "+-3^+b+-f");
	a ^= Number(e[1]) || 0;
	0 > a && (a = (a & 2147483647) + 2147483648);
	a %= 1E6;
	return a.toString() + "." + (a ^ h)
} 

function getTransRecursive(text,allrs,callback)
{
	console.log(text.length);
	var surplus=text.substring(4000); 
	text=text.substring(0,4000);
	getTrans(text,function(rs){
		allrs+=rs;
		if(surplus.length>0)
		{
			getTransRecursive(surplus,allrs,callback);
		}else{
			callback(allrs);
		}
	});
}
 function getTrans(text,callback)
 { 
	  
	 var tk=gettk(text, "424997.418814026");
	 var url=‘/translate_a/single?client=t&sl=zh-CN&tl=en&hl=zh-CN&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=UTF-8&oe=UTF-8&pc=1&otf=1&ssel=6&tsel=3&kc=0&tk=‘+ tk ; 
	 var options = {    
			hostname: ‘translate.google.cn‘,    
			port: 80,    
			path: url,    
			method: ‘POST‘,
			headers: { // 必选信息,  可以抓包工看一下
				"user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36"
			}		
		 }; 
	 var tbody="";	 
	 var req = http.request(options, function (remoteRes) {   
			remoteRes.setEncoding(‘utf8‘);    
			remoteRes.on(‘data‘, function (chunk) { 
				 tbody+=chunk;
			}); 
			remoteRes.on("end",function(){   
						  try
						  { 
							tbody=eval(tbody);
							tbody=tbody[0];
							var rstext="";
							for(var i in tbody)
							{
								rstext+=tbody[i][0];
							}
							callback(rstext);
						  }
						  catch(err)
						  {
							console.log("transErr1:");
							console.log(err);
							callback(text);
						  } 
				  });			
		});    
		req.on(‘error‘, function (e) {    
			console.log(‘transErr2:‘ + e.message);    
			callback(text);
		}); 
		req.write("q="+ encodeURI(text));
		req.end();		
 } 
 
function handleStr(newhost,url,str,isHtml,callback)
{  
	if(!isHtml||url==""||url=="/")
	{
		callback(str);
		return;
	}
	str= str.replace(/<script (([\s\S])*?)<\/script>/g,"");
	//替换掉所有列表中的网址
	for(var key in hostList){    
		str= str.replace(hostList[key],key); 
	} 
	
	//callback(str); 
	 
	//根据域名进行翻译
	switch(newhost)
	{
		case "www.guancha.cn": 
			var $ = cheerio.load(str);
			var headtitle=$("head>title").text();
			headtitle=unescape(headtitle.replace(/&#x/g,‘%u‘).replace(/;/g,‘‘)); 
			
			var nav=$(".nav").html();
			nav=unescape(nav.replace(/&#x/g,‘%u‘).replace(/;/g,‘‘)); 
			 
			var str = $(‘.all-txt‘).text();
			var title= $(‘.left-main‘).find(‘h3‘).text();
			 
			getTransRecursive(str,"",function(str){
				$(‘.all-txt‘).text(str);
				getTransRecursive(title,"",function(title){
					$(‘.left-main‘).find(‘h3‘).text(title);
					getTransRecursive(headtitle,"",function(head){
						$("head>title").text(title);
						getTransRecursive(nav,"",function(nav){
							$(".nav").html(nav);
							callback($.html());
						});
					});
				});
			}); 
		     
		break;
		default:
			callback(str);
		break;
	}  
}
var hostList={"www.thiscnnews.com":"www.guancha.cn","localhost1:8080":"user.guancha.cn"}
var noCatchList=[‘/?s=dhshouye‘,‘/internation?s=dhguoji‘,‘/military-affairs?s=dhjunshi‘,‘/economy?s=dhcaijing‘,‘/industry-science?s=dhkeji‘,‘/TMT?s=dhtmt‘,‘/car?s=dhqiche‘,‘/thinktank?s=dhzhiku‘,‘/GuanWangKanPian?s=dhshipin‘];

function isInArray3(arr,value){
    if(arr.indexOf&&typeof(arr.indexOf)==‘function‘){
        var index = arr.indexOf(value);
        if(index >= 0){
            return true;
        }
    }
    return false;
}

function getNewHost(host)
{
	if(host in hostList)
	{
		return hostList[host];
	}else{
		return "www.guancha.cn";
	}
}
function getRemote(newhost,url,res,file)
{
	
	var body="";
	var options = {    
			hostname: newhost,    
			port: 80,    
			path:url,    
			method: ‘GET‘    
		};  
	var req = http.request(options, function (remoteRes) {   
			remoteRes.setEncoding(‘utf8‘);    
			remoteRes.on(‘data‘, function (chunk) { 
				 body+=chunk;
			}); 
			remoteRes.on("end",function(){  
					  handleStr(newhost,url,body,remoteRes.headers[‘content-type‘].indexOf("text/html") != -1,function(rs){
						  if(file!=‘‘){
							  fs.writeFile(file, rs, {flag: ‘a‘}, function (err) {
									   if(err) {
											console.error(err);
										}
									});
						  }
						  res.end(rs);
					  }); 
				  });			
		});    
		req.on(‘error‘, function (e) {   
			res.end( e.message);		
			console.log(‘problem with request: ‘ + e.message);    
		});  
		req.end();	
}
var mkdirs = module.exports.mkdirs = function(dirpath, mode, callback) {
    fs.exists(dirpath, function(exists) {
        if(exists) {
                callback(dirpath);
        } else {
                //尝试创建父目录，然后再创建当前目录
                mkdirs(path.dirname(dirpath), mode, function(){
                        fs.mkdir(dirpath, mode, callback);
                });
        }
    });
};


function getCatch(newhost,url,callback)
{
	var file=__dirname+‘/tmp/‘+newhost.replace(‘:‘,‘‘);
	mkdirs(file,777,function(){
		file+=‘/‘+cryptos.md5(url);
		fs.exists(file,function(exists){
			 if(exists)
			 {
				 fs.readFile(file,‘utf-8‘,function(err,data){
					 if(err){
							 callback(false,file);
						 }
						 else{
							 callback(true,file,data); 
						}
				  });  
			 }else{
				callback(false,file); 
			 }
		});
	});  
} 
var useCatch=true;
//html解析器
var cheerio = require(‘cheerio‘);
//文件操作模块
var fs = require(‘fs‘),path = require(‘path‘); 
//加密模块
var cryptos=require("./cryptos"); 
//引入http模块
var http = require("http"); 
//设置主机名
 var hostName = ‘127.0.0.1‘;
//设置端口
var port = 9000;
//创建服务
var server = http.createServer(function(req,res){ 
		var newhost= getNewHost(req.headers.host);
		var url=req.url;
		if(useCatch&&!isInArray3(noCatchList,url))
		{
			getCatch(newhost,url,function(hasData,file,data){
				if(hasData)
				{
					res.end(data);
				}else{
					getRemote(newhost,url,res,file);  
				}
			}); 
		}else{
			getRemote(newhost,url,res,‘‘); 
		}
		
});
server.listen(port,hostName,function(){
    console.log(‘run‘);
});