package dns

import "strings"

// Extract the username from the domain name @domain that we're processing
// at the moment.
func ExtractUsername(pagesDomain, domain string) string {
	suffixlessDomain := strings.TrimSuffix(domain, "."+pagesDomain)
	usernameParts := strings.Split(suffixlessDomain, ".")
	if len(usernameParts) == 1 {
		return usernameParts[0]
	}

	return strings.Join(usernameParts, ".")
}