object: implement signing payload methods on PutRequest message

object/sign.go

@@ -0,0 +1,45 @@
+package object
+
+// SignedData returns marshaled payload of the Put request.
+//
+// If payload is nil, ErrHeaderNotFound returns.
+func (m PutRequest) SignedData() ([]byte, error) {
+	r := m.GetR()
+	if r == nil {
+		return nil, ErrHeaderNotFound
+	}
+
+	data := make([]byte, r.Size())
+
+	if _, err := r.MarshalTo(data); err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+// ReadSignedData copies marshaled payload of the Put request to passed buffer.
+//
+// If payload is nil, ErrHeaderNotFound returns.
+func (m PutRequest) ReadSignedData(p []byte) error {
+	r := m.GetR()
+	if r == nil {
+		return ErrHeaderNotFound
+	}
+
+	_, err := r.MarshalTo(p)
+
+	return err
+}
+
+// SignedDataSize returns the size of payload of the Put request.
+//
+// If payload is nil, -1 returns.
+func (m PutRequest) SignedDataSize() int {
+	r := m.GetR()
+	if r == nil {
+		return -1
+	}
+
+	return r.Size()
+}