CLI: Add lua encode command for inline scripts

common/lua/encode.go

@@ -0,0 +1,29 @@
+package lua
+
+import (
+	"bytes"
+	"compress/gzip"
+	"encoding/base64"
+
+	"github.com/xtls/xray-core/common/errors"
+)
+
+// Encode returns an inline script, optionally compressed with gzip at the highest level.
+func Encode(code []byte, zip bool) (string, error) {
+	if !zip {
+		return "base64:" + base64.StdEncoding.EncodeToString(code), nil
+	}
+
+	var data bytes.Buffer
+	writer, err := gzip.NewWriterLevel(&data, gzip.BestCompression)
+	if err != nil {
+		return "", errors.New("failed to compress gzip").Base(err)
+	}
+	if _, err := writer.Write(code); err != nil {
+		return "", errors.New("failed to compress gzip").Base(err)
+	}
+	if err := writer.Close(); err != nil {
+		return "", errors.New("failed to compress gzip").Base(err)
+	}
+	return "base64+gzip:" + base64.StdEncoding.EncodeToString(data.Bytes()), nil
+}