// Server returns the whois server and optional URL for a given query.
// Returns an error if it cannot resolve query to any known host.
func Server(query string) (string, string, error) {
// Queries on TLDs always against IANA
if strings.Index(query, ".") < 0 {
return IANA, "", nil
}
z := zonedb.PublicZone(query)
if z == nil {
return "", "", fmt.Errorf("no public zone found for %s", query)
}
host := z.WhoisServer()
wu := z.WhoisURL()
if host != "" {
return host, wu, nil
}
u, err := url.Parse(wu)
if err == nil && u.Host != "" {
return u.Host, wu, nil
}
return "", "", fmt.Errorf("no whois server found for %s", query)
}
// lookupWhoisServer digs into zonedb to find the whois server for the given
// tld. If no server is found (or domain is invalid) an error will be returned.
func lookupWhoisServer(domain string) (string, error) {
_, err := url.Parse(domain)
if err != nil {
return "", err
}
split := strings.Split(domain, ".")
// We assume there's at least a 'google' and 'com'
if len(split) < 2 {
return "", fmt.Errorf("Unable to parse domain (and find tld) for %s (split = %s)", domain, split)
}
zone := zonedb.PublicZone(domain)
if zone == nil {
return "", fmt.Errorf("unable to find zone for domain = %s", domain)
}
host := zone.WhoisServer()
if host != "" {
return host, nil
}
return "", fmt.Errorf("error finding whois server (empty host) for domain %s", domain)
}