support gzip/deflate encoding

main.go

@@ -3,6 +3,8 @@ package main
 import (
 	"bufio"
 	"bytes"
+	"compress/flate"
+	"compress/gzip"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -476,6 +478,24 @@ func (that *GlobalBackfeedManager) HandleLegacy(res http.ResponseWriter, req *ht
 	if len(splitter.Delimiter) == 0 {
 		splitter.Delimiter = []byte{0x00}
 	}
+	var body io.ReadCloser
+	switch req.Header.Get("Content-Encoding") {
+	case "":
+		body = req.Body
+	case "gzip":
+		var err error
+		body, err = gzip.NewReader(req.Body)
+		if err != nil {
+			WriteResponse(res, http.StatusBadRequest, err)
+			return
+		}
+		defer body.Close()
+	case "deflate":
+		body = flate.NewReader(req.Body)
+		defer body.Close()
+	default:
+		WriteResponse(res, http.StatusBadRequest, fmt.Errorf("unsupported Content-Encoding: %s", req.Header.Get("Content-Encoding")))
+	}
 	scanner := bufio.NewScanner(req.Body)
 	scanner.Split(splitter.Split)