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solver.go
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solver.go
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package dns
import (
"context"
"fmt"
"github.com/cert-manager/cert-manager/pkg/acme/webhook/apis/acme/v1alpha1"
golangsdk "github.com/opentelekomcloud/gophertelekomcloud"
"github.com/opentelekomcloud/gophertelekomcloud/openstack/dns/v2/recordsets"
"github.com/pkg/errors"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
)
const (
solverReferenceName string = "opentelekomcloud"
verbosity = klog.Level(4)
)
// OpenTelekomCloudDnsProviderSolver implements the provider-specific logic needed to
// 'present' an ACME challenge TXT record for your own DNS provider.
// To do so, it must implement the `github.com/cert-manager/cert-manager/pkg/acme/webhook.Solver`
// interface.
type OpenTelekomCloudDnsProviderSolver struct {
context context.Context
name string
k8sClient *kubernetes.Clientset
dnsClient *golangsdk.ServiceClient
}
func NewOpenTelekomCloudDnsProviderSolver(ctx context.Context) *OpenTelekomCloudDnsProviderSolver {
return &OpenTelekomCloudDnsProviderSolver{
context: ctx,
name: solverReferenceName,
}
}
// Name is used as the name for this DNS solver when referencing it on the ACME
// Issuer resource.
// This should be unique **within the group name**, i.e. you can have two
// solvers configured with the same Name() **so long as they do not co-exist
// within a single webhook deployment**.
// For example, `cloudflare` may be used as the name of a solver.
func (s *OpenTelekomCloudDnsProviderSolver) Name() string {
return s.name
}
// Present is responsible for actually presenting the DNS record with the
// DNS provider.
// This method should tolerate being called multiple times with the same value.
// cert-manager itself will later perform a self check to ensure that the
// solver has correctly configured the DNS provider.
func (s *OpenTelekomCloudDnsProviderSolver) Present(ch *v1alpha1.ChallengeRequest) error {
klog.InfoS("starting challenge request present", "dnsName", ch.DNSName, "zone", ch.ResolvedZone, "fqdn", ch.ResolvedFQDN)
err := s.setOpenTelekomCloudDnsServiceClient(ch)
if err != nil {
return errors.Wrap(err, "present failed")
}
zone, err := s.getResolvedZone(ch)
if err != nil {
return errors.Wrap(err, "present failed")
}
recordSets, err := s.getTxtRecordSetsByZone(ch, zone)
if err != nil {
return errors.Wrap(err, "present failed")
}
if len(recordSets) > 0 {
var updateOpts recordsets.UpdateOpts
updateOpts.Records = []string{getQuotedString(ch.Key)}
_, err = recordsets.Update(s.dnsClient, zone.ID, recordSets[0].ID, updateOpts).Extract()
if err != nil {
return errors.Wrap(err, "present failed")
}
return nil
}
var createOpts recordsets.CreateOpts
createOpts.Name = ch.ResolvedFQDN
createOpts.Type = txtRecordSetType
createOpts.Records = []string{getQuotedString(ch.Key)}
_, err = recordsets.Create(s.dnsClient, zone.ID, createOpts).Extract()
if err != nil {
return errors.Wrap(err, "present failed")
}
klog.InfoS("completed challenge request present", "dnsName", ch.DNSName, "zone", ch.ResolvedZone, "fqdn", ch.ResolvedFQDN)
return nil
}
// CleanUp should delete the relevant TXT record from the DNS provider console.
// If multiple TXT records exist with the same record name (e.g.
// _acme-challenge.example.com) then **only** the record with the same `key`
// value provided on the ChallengeRequest should be cleaned up.
// This is in order to facilitate multiple DNS validations for the same domain
// concurrently.
func (s *OpenTelekomCloudDnsProviderSolver) CleanUp(ch *v1alpha1.ChallengeRequest) error {
klog.InfoS("starting challenge request cleanup", "zone", ch.ResolvedZone, "fqdn", ch.ResolvedFQDN)
err := s.setOpenTelekomCloudDnsServiceClient(ch)
if err != nil {
return errors.Wrap(err, "clean up failed")
}
zone, err := s.getResolvedZone(ch)
if err != nil {
return errors.Wrap(err, "clean up failed")
}
recordSets, err := s.getTxtRecordSetsByZone(ch, zone)
if err != nil {
return errors.Wrap(err, "clean up failed")
}
if len(recordSets) == 0 {
klog.V(verbosity).Info(
fmt.Sprintf("clean up skipped: found 0 recordsets matching %s in zone %s",
ch.ResolvedFQDN,
ch.ResolvedZone),
)
return nil
}
err = recordsets.Delete(s.dnsClient, zone.ID, recordSets[0].ID).ExtractErr()
if err != nil {
return errors.Wrap(err, "clean up failed")
}
klog.InfoS("completed challenge request cleanup", "zone", ch.ResolvedZone, "fqdn", ch.ResolvedFQDN)
return nil
}
// Initialize will be called when the webhook first starts.
// This method can be used to instantiate the webhook, i.e. initialising
// connections or warming up caches.
// Typically, the kubeClientConfig parameter is used to build a Kubernetes
// client that can be used to fetch resources from the Kubernetes API, e.g.
// Secret resources containing credentials used to authenticate with DNS
// provider accounts.
// The stopCh can be used to handle early termination of the webhook, in cases
// where a SIGTERM or similar signal is sent to the webhook process.
func (s *OpenTelekomCloudDnsProviderSolver) Initialize(kubeClientConfig *rest.Config, stopCh <-chan struct{}) error {
klog.V(verbosity).Info(fmt.Sprintf("initializing cert-manager-webhook-%s", solverReferenceName))
initializeErr := fmt.Errorf(fmt.Sprintf(
"initializing cert-manager-webhook-%s failed",
solverReferenceName,
))
select {
case <-s.context.Done():
return s.context.Err()
case <-stopCh:
return errors.Wrap(fmt.Errorf("early termination signal"), initializeErr.Error())
default:
}
client, err := kubernetes.NewForConfig(kubeClientConfig)
if err != nil {
return errors.Wrap(err, initializeErr.Error())
}
s.k8sClient = client
klog.V(verbosity).Info(fmt.Sprintf("initialized cert-manager-webhook-%s", solverReferenceName))
return nil
}