97 lines
1.9 KiB
Go
97 lines
1.9 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"flag"
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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"strconv"
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"strings"
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"text/template"
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"time"
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)
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func main() {
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fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
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p := fs.Int("p", 28080, "port")
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t := fs.String("t", "{{ . }}", "template")
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y := fs.String("y", "http://localhost:41912", "target")
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if err := fs.Parse(os.Args[1:]); err != nil {
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panic(err)
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}
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tmpl, err := template.New("").Parse(*t)
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if err != nil {
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panic(err)
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}
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u, err := url.Parse(*y)
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if err != nil {
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panic(err)
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}
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c := &http.Client{
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Timeout: time.Minute,
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Transport: &http.Transport{
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DisableKeepAlives: true,
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},
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}
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handle := func(w http.ResponseWriter, r *http.Request) error {
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var v interface{}
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if err := json.NewDecoder(r.Body).Decode(&v); err != nil {
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return err
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}
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buff := bytes.NewBuffer(nil)
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if err := tmpl.Execute(buff, v); err != nil {
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return err
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}
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log.Printf("%+v => %s => %s", v, buff.Bytes(), u.String())
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req, err := http.NewRequest(r.Method, u.String(), io.NopCloser(buff))
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if err != nil {
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return err
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}
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req = req.WithContext(r.Context())
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for k, v := range r.Header {
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switch strings.ToLower(k) {
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case "content-length":
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default:
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req.Header.Set(k, v[0])
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for _, v := range v[1:] {
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req.Header.Add(k, v)
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}
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}
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}
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resp, err := c.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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for k, v := range resp.Header {
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w.Header().Set(k, v[0])
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for _, v := range v[1:] {
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w.Header().Add(k, v)
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}
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}
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w.WriteHeader(resp.StatusCode)
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io.Copy(w, resp.Body)
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return nil
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}
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log.Println("listening on", *p)
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if err := http.ListenAndServe(":"+strconv.Itoa(*p), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if err := handle(w, r); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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}
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})); err != nil {
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panic(err)
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}
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}
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