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dns.go
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dns.go
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package certmanager
import (
"golang.org/x/crypto/acme"
"time"
"github.com/Cloud-Foundations/golib/pkg/dns"
"github.com/Cloud-Foundations/golib/pkg/log"
)
type dnsResponder struct {
rdw dns.RecordDeleteWriter
logger log.DebugLogger
// Mutable data follow.
records map[string]string
}
func (cm *CertificateManager) respondDNS(domain string,
challenge *acme.Challenge) error {
response, err := cm.acmeClient.DNS01ChallengeRecord(challenge.Token)
if err != nil {
return err
}
return cm.responder.Respond("_acme-challenge."+domain, response)
}
func makeDnsResponder(rdw dns.RecordDeleteWriter,
logger log.DebugLogger) (Responder, error) {
return &dnsResponder{
rdw: rdw,
logger: logger,
records: make(map[string]string),
}, nil
}
func (r *dnsResponder) Cleanup() {
if len(r.records) < 1 {
return
}
for fqdn := range r.records {
if err := r.rdw.DeleteRecords(fqdn, "TXT"); err != nil {
r.logger.Println(err)
} else {
delete(r.records, fqdn)
}
}
}
func (r *dnsResponder) Respond(key, value string) error {
if r.records[key] == value {
return nil
}
r.logger.Debugf(1, "publishing %s TXT=\"%s\"\n", key, value)
err := r.rdw.WriteRecords(key, "TXT", []string{value}, time.Second*15, true)
if err != nil {
return err
}
r.records[key] = value
return nil
}