mvp

go.mod

@@ -0,0 +1,3 @@
+module gitea/json-adapter
+
+go 1.22.3

main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"flag"
+	"io"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"os"
+	"strconv"
+	"text/template"
+)
+
+func main() {
+	fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
+	p := fs.Int("p", 28080, "port")
+	t := fs.String("t", "{{ . }}", "template")
+	y := fs.String("y", "http://localhost:41912", "target")
+	if err := fs.Parse(os.Args[1:]); err != nil {
+		panic(err)
+	}
+
+	tmpl, err := template.New("").Parse(*t)
+	if err != nil {
+		panic(err)
+	}
+
+	u, err := url.Parse(*y)
+	if err != nil {
+		panic(err)
+	}
+	proxy := httputil.NewSingleHostReverseProxy(u)
+
+	handle := func(w http.ResponseWriter, r *http.Request) error {
+		var v interface{}
+		if err := json.NewDecoder(r.Body).Decode(&v); err != nil {
+			return err
+		}
+		buff := bytes.NewBuffer(nil)
+		if err := tmpl.Execute(buff, v); err != nil {
+			return err
+		}
+		r.Body = io.NopCloser(buff)
+		r.ContentLength = int64(len(buff.Bytes()))
+		proxy.ServeHTTP(w, r)
+		return nil
+	}
+	log.Println("listening on", *p)
+	if err := http.ListenAndServe(":"+strconv.Itoa(*p), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if err := handle(w, r); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+		}
+	})); err != nil {
+		panic(err)
+	}
+}