90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
// Package proxy...
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//
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// Description : 正向代理的实现
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//
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// Author : go_developer@163.com<白茶清欢>
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//
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// Date : 2021-08-06 2:07 下午
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package proxy
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import (
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"compress/gzip"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"strings"
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"git.zhangdeman.cn/zhangdeman/gopkg/safe"
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)
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// Forward 正向代理的实现
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//
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// Author : go_developer@163.com<白茶清欢>
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//
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// Date : 2:08 下午 2021/8/6
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func Forward(rw http.ResponseWriter, req *http.Request, serverConfig *Server) {
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fmt.Printf("Received request %s %s %s\n", req.Method, req.Host, req.RemoteAddr)
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transport := http.DefaultTransport
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// step 1
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outReq := new(http.Request)
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*outReq = *req // this only does shallow copies of maps
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if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
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if prior, ok := outReq.Header["X-Forwarded-For"]; ok {
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clientIP = strings.Join(prior, ", ") + ", " + clientIP
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}
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outReq.Header.Set("X-Forwarded-For", clientIP)
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}
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// 写入重写的请求Header
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for k, v := range serverConfig.RewriteRequestHeader {
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outReq.Header.Set(k, v)
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}
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// 重写请求地址
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outReq.Host = serverConfig.Host
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outReq.URL.Path = serverConfig.URI
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outReq.URL.Scheme = serverConfig.Scheme
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outReq.URL.Host = serverConfig.Host
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// step 2
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res, err := transport.RoundTrip(outReq)
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if err != nil {
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rw.WriteHeader(http.StatusBadGateway)
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return
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}
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// step 3
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for key, value := range res.Header {
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for _, v := range value {
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rw.Header().Add(key, v)
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}
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}
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rw.WriteHeader(res.StatusCode)
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// 重写请求header
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for k, v := range serverConfig.RewriteResponseHeader {
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rw.Header().Set(k, v)
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}
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// 重写响应数据
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if !strings.Contains(strings.ToLower(res.Header.Get("Content-Type")), "application/json") || nil == serverConfig.RewriteResponseData || len(serverConfig.RewriteResponseData) == 0 {
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io.Copy(rw, res.Body)
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} else {
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var responseData []byte
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var gzipData io.Reader
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gzipData, err = gzip.NewReader(res.Body)
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responseData, err = ioutil.ReadAll(gzipData)
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fmt.Println(string(responseData), err)
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formatData, _ := safe.Filter(responseData, serverConfig.RewriteResponseData)
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rw.Write(formatData)
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}
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res.Body.Close()
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}
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