add files

rights.go

@@ -0,0 +1,18 @@
+package models
+
+type Rights string
+
+const (
+	Read      Rights = "R"
+	Write     Rights = "W"
+	ReadWrite Rights = "RW"
+)
+
+func (r *Rights) GetRights() Rights {
+	if r == nil {
+		return ReadWrite
+	} else if *r == "" {
+		return ReadWrite
+	}
+	return *r
+}