Function processDNSValue

command/ca/init.go:827–847

processDNSValue reads DNS names from user supplied DNS value and transforms it into DNS names and IP addresses.

(dnsValue string)

// processDNSValue reads DNS names from user supplied DNS value
// and transforms it into DNS names and IP addresses.
func processDNSValue(dnsValue string) ([]string, error) {
	var (
		dnsValidator = ui.DNS()
		dnsNames     []string
	)
	dnsValue = strings.ReplaceAll(dnsValue, " ", ",")
	parts := strings.Split(dnsValue, ",")
	if allEmpty(parts) {
		return nil, stderrors.New("dns must not be empty")
	}
	for _, name := range parts {
		if name == "" { // skip empty name
			continue
		}
		if err := dnsValidator(name); err != nil {
			return nil, err
		}
		dnsNames = append(dnsNames, normalize(strings.TrimSpace(name)))
	}
	return dnsNames, nil
}

// normalize ensures an IPv6 hostname (i.e. [::1]) representation is
// converted to its IP representation (::1).