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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

代理流程

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
web

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
windows
mac 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：

//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。

//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

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

为ajax请求增加跨域头

//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

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

//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

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

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

//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

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原文地址：https://www.cnblogs.com/c-x-a/p/9228737.html