refactoring

pkg/utils/sign.go

@@ -0,0 +1,23 @@
+package utils
+
+import (
+	"encoding/json"
+
+	"gopkg.in/square/go-jose.v2"
+)
+
+func Sign(object interface{}, signer jose.Signer) (string, error) {
+	payload, err := json.Marshal(object)
+	if err != nil {
+		return "", err
+	}
+	return SignPayload(payload, signer)
+}
+
+func SignPayload(payload []byte, signer jose.Signer) (string, error) {
+	result, err := signer.Sign(payload)
+	if err != nil {
+		return "", err
+	}
+	return result.CompactSerialize()
+}