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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package dnssec
import (
"fmt"
"strings"
"github.com/miekg/dns"
)
func splitToZones(fqZoneName string) ([]string, error) {
if fqZoneName == "" || !dns.IsFqdn(fqZoneName) {
return nil, fmt.Errorf("%s is not FQDN", fqZoneName)
}
if fqZoneName == "." {
return []string{"."}, nil
}
components := strings.Split(fqZoneName, ".")
l := len(components) // always >= 2
result := make([]string, 0, l)
result = append(result, ".")
var zone string
for i := l - 2; i >= 0; i-- {
zone = components[i] + "." + zone
result = append(result, zone)
}
return result, nil
}
func getParentZone(fqZoneName string) (string, error) {
zones, err := splitToZones(fqZoneName)
if err != nil {
return "", err
}
if len(zones) < 2 {
return "", fmt.Errorf("No parent zone for %s", fqZoneName)
}
return zones[len(zones)-2], nil
}
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