mirror of
https://github.com/kubernetes-sigs/external-dns.git
synced 2025-08-06 01:26:59 +02:00
70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package provider
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import (
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"strings"
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log "github.com/sirupsen/logrus"
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"golang.org/x/net/idna"
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)
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type ZoneIDName map[string]string
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func (z ZoneIDName) Add(zoneID, zoneName string) {
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z[zoneID] = zoneName
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}
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// FindZone identifies the most suitable DNS zone for a given hostname.
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// It returns the zone ID and name that best match the hostname.
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//
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// The function processes the hostname by splitting it into labels and
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// converting each label to its Unicode form using IDNA (Internationalized
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// Domain Names for Applications) standards.
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//
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// Labels containing underscores ('_') are skipped during Unicode conversion.
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// This is because underscores are often used in special DNS records (e.g.,
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// SRV records as per RFC 2782, or TXT record for services) that are not
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// IDNA-aware and cannot represent non-ASCII labels. Skipping these labels
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// ensures compatibility with such use cases.
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func (z ZoneIDName) FindZone(hostname string) (suitableZoneID, suitableZoneName string) {
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var name string
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domain_labels := strings.Split(hostname, ".")
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for i, label := range domain_labels {
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if strings.Contains(label, "_") {
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continue
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}
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convertedLabel, err := idna.Lookup.ToUnicode(label)
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if err != nil {
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log.Warnf("Failed to convert label '%s' of hostname '%s' to its Unicode form: %v", label, hostname, err)
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convertedLabel = label
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}
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domain_labels[i] = convertedLabel
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}
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name = strings.Join(domain_labels, ".")
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for zoneID, zoneName := range z {
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if name == zoneName || strings.HasSuffix(name, "."+zoneName) {
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if suitableZoneName == "" || len(zoneName) > len(suitableZoneName) {
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suitableZoneID = zoneID
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suitableZoneName = zoneName
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}
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}
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}
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return
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}
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