可以高度定制的代理服务器anyproxy

简介

anyproxy是一款可以高度定制的代理服务器,基于nodejs。

特征

支持https明文代理 支持低网速模拟 支持二次开发,可以用javascript控制代理的全部流程,搭建前端个性化调试环境 提供web版界面,观测请求情况

设计

anyproxy把http通信过程中的各个阶段进行抽离,分解成三个阶段:

收到来自客户端请求之后,允许开发者直接从本地提供返回 在转发请求到服务器前,允许开发者对发送的请求进行修改 在收到服务器响应之后,允许开发者对响应内容进行修改,再返回给客户端

对于上述每个阶段,anyproxy都提供了API接口,引入开发者编写自己的规则代码,实时干预通信过程,以此满足各类自定义需求。

具体地,我们提供的接口包括:

收到用户请求之后

shouldUseLocalResponse ,是否在本地直接发送响应(不再向服务器发出请求) dealLocalResponse 如果shouldUseLocalResponse返回true,会调用这个函数来获取本地响应内容(异步接口) 向服务端发出请求之前

replaceRequestProtocol 替换向服务器发出的请求协议,支持http和https的替换 replaceRequestOption 替换向服务器发出的请求参数,即nodeJS中的 request option replaceRequestData 替换请求的body 向用户返回服务端的响应之前

replaceResponseStatusCode 替换服务器响应的http状态码 replaceResponseHeader 替换服务器响应的http头 replaceServerResDataAsync 替换服务器响应的数据(异步接口) pauseBeforeSendingResponse 在请求返回给用户前的延迟时间

快速开始

安装

安装Nodejs npm install -g anyproxy,有可能需要sudo python可选安装

启动

默认启动anyproxy 定制启动端口anyproxy --port 8001 使用某个规则文件anyproxy --rule ./rule_sample/rule_allow_CORS.js 代理https请求anyproxy --intercept(需要安装证书,详情见下文) 其他命令可以通过anyproxy -h查看

加载网页界面

访问https://127.0.0.1:8002,你会在浏览器里看到实时的请求。 要确保是现代浏览器

HTTPS相关教程

生成RootCA

命令行执行 sudo anyproxy –root 找到RootCA文件

方法一: 执行完成之后,会打开证书的安装路径,即可看到 rootCA.crt 文件 方法二: 启动anyproxy,浏览器打开 https://localhost:8002/fetchCrtFile ,也能获取rootCA.crt文件 方法三:启动anyproxy,https://localhost:8002/qr_root 可以获取证书路径的二维码,移动端安装时会比较便捷 打开上述rootCA.crt文件 根据操作系统提示,信任rootCA

其他

如果在访问时出现UNAUTHORIZED_CERTIFICATE一类的安全警告,请重新检查证书的安装情况 证书只需生成一次,使用前每个终端都需要信任它

明文解析HTTPS

需要解析HTTPS时,用intercept参数来启动anyproxy anyproxy --intercept 为终端设置代理,在UI界面就能看到明文的HTTPS请求数据了,带把小锁的就是HTTPS请求

进阶 - 用rule来手动处理https请求(如:代理文件到本地)

AnyProxy默认不会解析https请求,你需要引入shouldInterceptHttpsReq这个函数来显式指定解析哪个请求。具体可以参照这份sample : rule_intercept_some_https_requests.js

其他

anyproxy --clear可以清除所有已生成的证书。清除后,各终端需要重新安装证书。 日常开发中,不要使用anyproxy --type https来调试。AnyProxy使用https over http的方法来进行代理,而这条命令启动的是一个https代理服务器,两者使用场景完全不同。

AnyProxy规则文件样例

修改请求头:防止CDN返回304

以“防止CDN返回304”这个需求为例,最直接的方案是拦截请求,在发送到CDN前删除header中的if-modified-since字段。在AnyProxy中,配置replaceRequestOption接口,3行代码就能实现这个自定义功能:

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// rule file
module.exports = {
   //在向服务器发出请求前,AnyProxy会调用这个接口,可以在此时修改发送请求的参数
   replaceRequestOption : function (req, option ){
       var newOption = option ;
       delete newOption.headers[ 'if-modified-since' ];
       return newOption;
   }
};

修改响应数据

再举个例子,如果你想修改响应数据,在所有html文件最后加个”Hello World”,就需要调用replaceServerResDataAsync接口,并结合content-type字段来进行修改,大约需要8行代码。

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// rule file
module.exports = {
     replaceServerResDataAsync: function (req,res,serverResData,callback){
         //append "hello world" to all web pages
         if(/html/i.test(res.headers[ 'content-type' ])){
             var newDataStr = serverResData.toString();
             newDataStr += "hello world!" ;
             callback(newDataStr);
         } else {
             callback(serverResData);
         }
     }
};

把所有的响应延迟1500毫秒

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module.exports = {
 
     pauseBeforeSendingResponse : function (req,res){
         //delay all the response for 1500ms
         return 1500;
     }
 
};

为ajax请求增加跨域头

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// rule scheme :
// Ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
 
module.exports = {
     shouldUseLocalResponse : function (req,reqBody){
         //intercept all options request
         if(req.method == "OPTIONS" ){
             return true ;
         } else {
             return false ;
         }
     },
 
     dealLocalResponse : function (req,reqBody,callback){
         if(req.method == "OPTIONS" ){
             callback(200,mergeCORSHeader(req.headers), "" );
         }
     },
 
     replaceResponseHeader: function (req,res,header){
         return mergeCORSHeader(req.headers, header);
     }
 
};
 
function mergeCORSHeader(reqHeader,originHeader){
     var targetObj = originHeader || {};
 
     delete targetObj[ "Access-Control-Allow-Credentials" ];
     delete targetObj[ "Access-Control-Allow-Origin" ];
     delete targetObj[ "Access-Control-Allow-Methods" ];
     delete targetObj[ "Access-Control-Allow-Headers" ];
 
     targetObj[ "access-control-allow-credentials" ] = "true" ;
     targetObj[ "access-control-allow-origin" ]      = reqHeader[ 'origin' ] || "-___-||" ;
     targetObj[ "access-control-allow-methods" ]     = "GET, POST, PUT" ;
     targetObj[ "access-control-allow-headers" ]     = reqHeader[ 'access-control-request-headers' ] || "-___-||" ;
 
     return targetObj;
}

截获github.com的https请求,再在最后加点文字

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module.exports = {
 
 
     replaceServerResDataAsync: function (req,res,serverResData,callback){
         // add "hello github" to all github pages
         if(req.headers.host == "github.com" ){
             serverResData += "hello github" ;
         }
         callback(serverResData);
     },
 
     shouldInterceptHttpsReq : function (req){
         //intercept https://github.com/
         //otherwise, all the https traffic will not go through this proxy
 
         // return true ;
         if(req.headers.host == "github.com" ){
             return true ;
         } else {
             return false ;
         }
     }
};

去除响应头里缓存相关的头

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// rule scheme :
 
module.exports = {
   replaceRequestOption : function (req, option ){
       var newOption = option ;
       delete newOption.headers[ 'if-none-match' ];
       delete newOption.headers[ 'if-modified-since' ];
 
       return newOption;
   },
 
     replaceResponseHeader: function (req,res,header){
         header = header || {};
         header[ "Cache-Control" ]                    = "no-cache, no-store, must-revalidate" ;
         header[ "Pragma" ]                           = "no-cache" ;
         header[ "Expires" ]                          = 0;
 
         return header;
     }
};

在请求发送到服务端前对参数做一些调整

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module.exports = {
 
     replaceRequestOption : function (req, option ){
         // replace request towards https://www.taobao.com
         //                     to https://www.taobao.com/about/
 
         /*
         option scheme:
         {
             hostname : "www.taobao.com"
             port     : 80
             path     : "/"
             method   : "GET"
             headers  : {cookie:""}
         }
         */
         if( option .hostname == "www.taobao.com" && option .path == "/" ){
             option .path = "/about/" ;
         }
     }
};

改变服务端响应的http状态码

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module.exports = {
 
     replaceResponseStatusCode: function (req,res,statusCode){
         //redirect requests toward https://www.taobao.com/*
         //                      to https://www.etao.com
         //using 302
 
         if(req.headers.host == "www.taobao.com" ){
             statusCode = 302;
         }
 
         return statusCode;
     },
 
     replaceResponseHeader: function (req,res,header){
         if(req.headers.host == "www.taobao.com" ){
             header.location = "https://www.etao.com" ;
         }
 
         return header;
     }
};

把响应映射到本地

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// replace all the images with local one
var fs      = require( "fs" );
 
var LOCAL_IMAGE = "/Users/path/to/image.png" ;
 
module.exports = {
 
     summary: function (){
         return "replace all the images with local one" ;
     },
 
     //mark if use local response
     shouldUseLocalResponse : function (req,reqBody){
         if(/\.(png|gif|jpg|jpeg)$/.test(req.url)){
             req.replaceLocalFile = true ;
             return true ;
         } else {
             return false ;
         }
     },
 
     dealLocalResponse : function (req,reqBody,callback){
         if(req.replaceLocalFile){
             callback(200, { "content-type" : "image/png" }, fs.readFileSync(LOCAL_IMAGE) );
         }
     }
};

整体结构

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/*
read the following wiki before using rule file
https://github.com/alibaba/anyproxy/wiki/What-is-rule-file-and-how-to-write-one
*/
module.exports = {
   /*
   These functions will overwrite the default ones, write your own when necessary.
     Comments in Chinese are nothing but a translation of key points. Be relax if you dont understand.
     致中文用户:中文注释都是只摘要,必要时请参阅英文文档。欢迎提出修改建议。
   */
     summary: function (){
         return "this is a blank rule for AnyProxy" ;
     },
 
 
 
 
     //=======================
     // when getting a request from user
     //收到用户请求之后
     //=======================
 
     //是否截获https请求
     //should intercept https request, or it will be forwarded to real server
     shouldInterceptHttpsReq : function (req){
         return false ;
     },
 
     //是否在本地直接发送响应(不再向服务器发出请求)
   //whether to intercept this request by local logic
   //if the return value is true , anyproxy will call dealLocalResponse to get response data and will not send request to remote server anymore
     //req is the user 's request sent to the proxy server
   shouldUseLocalResponse : function(req,reqBody){
         return false;
   },
 
     //如果shouldUseLocalResponse返回true,会调用这个函数来获取本地响应内容
     //you may deal the response locally instead of sending it to server
     //this function be called when shouldUseLocalResponse returns true
     //callback(statusCode,resHeader,responseData)
     //e.g. callback(200,{"content-type":"text/html"},"hello world")
   dealLocalResponse : function(req,reqBody,callback){
         callback(statusCode,resHeader,responseData)
   },
 
 
 
     //=======================
     //when ready to send a request to server
     //向服务端发出请求之前
     //=======================
 
     //替换向服务器发出的请求协议(http和https的替换)
     //replace the request protocol when sending to the real server
     //protocol : "http" or "https"
     replaceRequestProtocol:function(req,protocol){
       var newProtocol = protocol;
       return newProtocol;
     },
 
     //替换向服务器发出的请求参数(option)
     //option is the configuration of the http request sent to remote server. You may refers to https://nodejs.org/api/http.html#http_http_request_options_callback
     //you may return a customized option to replace the original one
     //you should not overwrite content-length header in options, since anyproxy will handle it for you
     replaceRequestOption : function(req,option){
         var newOption = option;
         return newOption;
     },
 
     //替换请求的body
     //replace the request body
     replaceRequestData: function(req,data){
         return data;
     },
 
 
 
     //=======================
     //when ready to send the response to user after receiving response from server
     //向用户返回服务端的响应之前
     //=======================
 
     //替换服务器响应的http状态码
     //replace the statusCode before it' s sent to the user
     replaceResponseStatusCode: function (req,res,statusCode){
       var newStatusCode = statusCode;
       return newStatusCode;
     },
 
     //替换服务器响应的http头
     // replace the httpHeader before it 's sent to the user
     //Here header == res.headers
     replaceResponseHeader: function(req,res,header){
       var newHeader = header;
       return newHeader;
     },
 
     //替换服务器响应的数据
     //replace the response from the server before it' s sent to the user
     //you may return either a Buffer or a string
     //serverResData is a Buffer. for those non-unicode reponse , serverResData.toString() should not be your first choice.
     replaceServerResDataAsync: function (req,res,serverResData,callback){
         callback(serverResData);
     },
 
     //Deprecated
     // replaceServerResData: function (req,res,serverResData){
     //     return serverResData;
     // },
 
     //在请求返回给用户前的延迟时间
     // add a pause before sending response to user
     pauseBeforeSendingResponse : function (req,res){
       var timeInMS = 1; //delay all requests for 1ms
       return timeInMS;
     }
 
};

AnyProxy其他特性

支持Https的中间人(man-in-the-middle)代理,同时提供便捷的根证书安装路径,方便移动端导入证书 低网速网速模拟,协助调试2G/3G下的表现 可以导出所有请求记录,供后期数据分析使用 可以进行模块化调用,做二次封装,合并到现有的前端集成开发环境中,个性化搭建自己的调试环境

文档和支持

HTTPS相关配置的中文文档

What is rule file and how to write one

代理服务器的新轮子:anyproxy

 

转载:https://www.2cto.com/kf/201707/654139.html

转载于:https://www.cnblogs.com/c-x-a/p/9228737.html

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