Refactor IP parsing to use appendIfNotExcluded for exclusion validation and error handling

parser/pkg.go

@@ -0,0 +1,16 @@
+package parser
+
+func appendIfNotExcluded(ip string, ips []string, validator IPValidator) ([]string, error) {
+	if exclude, listIP, err := validator.IsExcluded(ip); err != nil {
+		return ips, err
+	} else if exclude {
+		if listIP == nil || len(listIP) == 0 {
+			return ips, nil
+		}
+		ips = append(ips, listIP...)
+		return ips, nil
+	}
+
+	ips = append(ips, ip)
+	return ips, nil
+}