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main.go
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main.go
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package main
import (
"bytes"
"compress/gzip"
"context"
"errors"
"flag"
"io/ioutil"
"log"
"net/http"
"net/http/httputil"
"net/url"
)
type Proxy struct {
proxy *httputil.ReverseProxy
host string
original func(*http.Request)
}
func newProxy(u *url.URL) *Proxy {
rp := httputil.NewSingleHostReverseProxy(u)
p := &Proxy{
proxy: rp,
host: u.Host,
original: rp.Director,
}
rp.Director = p.director
return p
}
func (p *Proxy) director(r *http.Request) {
p.original(r)
if p.host != "" {
r.Host = p.host
}
if r.ContentLength == 0 || r.Body == nil {
return
}
switch r.Header.Get("Content-Encoding") {
case "gzip":
b, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Printf("failed to decompress: ioutil.ReadAll(): %s", err)
return
}
dr, err := gzip.NewReader(bytes.NewReader(b))
if err != nil {
log.Printf("failed to decompress: gzip.NewReader(): %s", err)
r.Body = ioutil.NopCloser(bytes.NewReader(b))
return
}
db, err := ioutil.ReadAll(dr)
if err != nil {
log.Printf("failed to decompress: ioutil.ReadAll(decompress): %s", err)
r.Body = ioutil.NopCloser(bytes.NewReader(b))
return
}
r.Body = ioutil.NopCloser(bytes.NewReader(db))
r.ContentLength = int64(len(db))
r.Header.Del("Content-Encoding")
}
}
func (p *Proxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
p.proxy.ServeHTTP(rw, req)
}
var (
optTarget string
optAddr string
)
func run(ctx context.Context) error {
flag.StringVar(&optTarget, "target", "https://httpbin.org/", `reverse proxy target URL`)
flag.StringVar(&optAddr, "addr", ":8000", `reverse proxy server address and port`)
if optTarget == "" {
return errors.New("no targets. check -target")
}
target, err := url.Parse(optTarget)
if err != nil {
return err
}
p := newProxy(target)
srv := &http.Server{
Addr: optAddr,
Handler: p,
}
log.Printf("reveser proxy is listening %s\n", optAddr)
return srv.ListenAndServe()
}
func main() {
err := run(context.Background())
if err != nil {
log.Fatal(err)
}
}