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mapping.go
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mapping.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package dns
import (
"strings"
)
////////////////////////////////////////////////////////////////////////////////
// Text Record ObjectName Mapping
////////////////////////////////////////////////////////////////////////////////
var TxtPrefix = "comment-"
func AlignHostname(host string) string {
if strings.HasSuffix(host, ".") {
return host
}
return host + "."
}
func NormalizeHostname(host string) string {
if strings.HasPrefix(host, "\\052.") {
host = "*" + host[4:]
}
if strings.HasSuffix(host, ".") {
return host[:len(host)-1]
}
return host
}
func MapToProvider(rtype string, dnsset *DNSSet, base string) (DNSSetName, *RecordSet) {
dnsName := dnsset.Name.DNSName
rs := dnsset.Sets[rtype]
if rtype == RS_META {
prefix := dnsset.GetMetaAttr(ATTR_PREFIX)
if prefix == "" {
prefix = TxtPrefix
dnsset.SetMetaAttr(ATTR_PREFIX, prefix)
}
metaName := calcMetaRecordDomainName(dnsName, prefix, base)
new := *dnsset.Sets[rtype]
new.Type = RS_TXT
return dnsset.Name.WithDNSName(metaName), &new
}
return dnsset.Name, rs
}
func calcMetaRecordDomainName(name, prefix, base string) string {
add := ""
if name == base {
prefix += "-base."
} else if strings.HasPrefix(name, "*.") {
add = "*."
name = name[2:]
if name == base {
prefix += "-base."
}
} else if strings.HasPrefix(name, "@.") {
// special case: allow apex label for Azure
name = name[2:]
prefix += "---at."
}
return add + prefix + name
}
// CalcMetaRecordDomainNameForValidation returns domain name of metadata TXT DNS record if globally defined prefix is used.
// As it does not consider the zone, it may be wrong for the zone base domain.
func CalcMetaRecordDomainNameForValidation(name string) string {
return calcMetaRecordDomainName(name, TxtPrefix, "")
}
func MapFromProvider(name DNSSetName, rs *RecordSet) (DNSSetName, *RecordSet) {
dns := name.DNSName
if rs.Type == RS_TXT {
prefix := rs.GetAttr(ATTR_PREFIX)
if prefix != "" {
add := ""
if strings.HasPrefix(dns, "*.") {
add = "*."
dns = dns[2:]
}
if strings.HasPrefix(dns, prefix) {
new := *rs
new.Type = RS_META
dns = dns[len(prefix):]
if strings.HasPrefix(dns, "-base.") {
dns = dns[6:]
} else if strings.HasPrefix(dns, "---at.") {
dns = dns[6:]
add = "@."
} else {
// for backwards compatibility of form *.comment-.basedomain
dns = strings.TrimPrefix(dns, ".")
}
return name.WithDNSName(add + dns), &new
} else {
return name.WithDNSName(add + dns), rs
}
}
}
return name.WithDNSName(dns), rs
}