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：

//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