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solver_utils.go
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/
solver_utils.go
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package dns
import (
"fmt"
"github.com/caarlos0/env/v10"
"github.com/cert-manager/cert-manager/pkg/acme/webhook/apis/acme/v1alpha1"
golangsdk "github.com/opentelekomcloud/gophertelekomcloud"
"github.com/opentelekomcloud/gophertelekomcloud/openstack"
"github.com/opentelekomcloud/gophertelekomcloud/openstack/dns/v2/recordsets"
"github.com/opentelekomcloud/gophertelekomcloud/openstack/dns/v2/zones"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog/v2"
"math/rand"
"strconv"
"strings"
)
const (
primaryDnsIpAddress string = "100.125.4.25"
secondaryDnsIpAddress string = "100.125.129.199"
authUrl string = "https://iam.%s.otc.t-systems.com:443/v3"
txtRecordSetType string = "TXT"
)
var (
OpenTelekomCloudDnsServers = []string{primaryDnsIpAddress, secondaryDnsIpAddress}
)
func GetOpenTelekomCloudDnsServerAddress() string {
idx := rand.Intn(len(OpenTelekomCloudDnsServers))
dnsServerAddress := OpenTelekomCloudDnsServers[idx]
klog.V(verbosity).Info(fmt.Sprintf("opentelekomcloud nameserver %s will be used", dnsServerAddress))
return dnsServerAddress
}
func (s *OpenTelekomCloudDnsProviderSolver) setOpenTelekomCloudDnsServiceClient(ch *v1alpha1.ChallengeRequest) error {
if s.dnsClient != nil {
return nil
}
config, err := loadConfig(ch.Config)
if err != nil {
return errors.Wrap(err, "loading challenge-request config failed")
}
klog.V(verbosity).Info("loaded challenge request config")
inCluster := false
secret := &OpenTelekomCloudDnsProviderSecrets{}
err = env.Parse(secret)
if err != nil {
klog.V(verbosity).Info(fmt.Sprintf("no ak/sk pair found in env variables, falling back to kubernetes secrets"))
inCluster = true
}
if inCluster {
secret, err = s.getOpenTelekomCloudDnsProviderSecrets(config, ch)
if err != nil {
return errors.Wrap(err, "failed to load access and secret keys")
}
}
authOpts := golangsdk.AKSKAuthOptions{
IdentityEndpoint: fmt.Sprintf(authUrl, config.Region),
AccessKey: secret.AccessKey,
SecretKey: secret.SecretKey,
}
endpointOpts := golangsdk.EndpointOpts{
Region: config.Region,
}
providerClient, err := openstack.AuthenticatedClient(authOpts)
if err != nil {
return errors.Wrap(err, "creating an opentelekomcloud provider client failed")
}
dnsServiceClient, err := openstack.NewDNSV2(providerClient, endpointOpts)
if err != nil {
return errors.Wrap(err, "creating an opentelekomcloud dns service client failed")
}
klog.V(verbosity).Info("created an opentelekomcloud dns service client")
s.dnsClient = dnsServiceClient
return nil
}
func (s *OpenTelekomCloudDnsProviderSolver) getOpenTelekomCloudDnsProviderSecrets(
config OpenTelekomCloudDnsProviderConfig,
ch *v1alpha1.ChallengeRequest,
) (*OpenTelekomCloudDnsProviderSecrets, error) {
ak, err := s.getSecret(ch.ResourceNamespace, config.AccessKeySecretRef)
if err != nil {
return nil, err
}
sk, err := s.getSecret(ch.ResourceNamespace, config.SecretKeySecretRef)
if err != nil {
return nil, err
}
secret := OpenTelekomCloudDnsProviderSecrets{
AccessKey: ak,
SecretKey: sk,
}
return &secret, nil
}
func (s *OpenTelekomCloudDnsProviderSolver) getSecret(namespace string, secretKeyRef *corev1.SecretKeySelector) (string, error) {
secret, err := s.k8sClient.CoreV1().Secrets(namespace).Get(s.context, secretKeyRef.Name, metav1.GetOptions{})
if err != nil {
return "", fmt.Errorf("could not fetch secret %s: %w", secretKeyRef.Name, err)
}
data, ok := secret.Data[secretKeyRef.Key]
if !ok {
return "", fmt.Errorf("could not get key %s in secret %s", secretKeyRef.Key, secretKeyRef.Name)
}
klog.V(verbosity).Info(fmt.Sprintf("fetched secret: %s", secretKeyRef.Name))
return string(data), nil
}
func (s *OpenTelekomCloudDnsProviderSolver) getResolvedZone(ch *v1alpha1.ChallengeRequest) (*zones.Zone, error) {
action := strings.ToLower(string(ch.Action))
listOpts := zones.ListOpts{
Name: ch.ResolvedZone,
}
allPages, err := zones.List(s.dnsClient, listOpts).AllPages()
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("%s up failed", action))
}
allZones, err := zones.ExtractZones(allPages)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("%s up failed", strings.ToLower(string(ch.Action))))
}
if len(allZones) != 1 {
return nil, fmt.Errorf("%s failed: found %v while expecting 1 for zone %s", action, len(allZones), ch.ResolvedZone)
}
return &allZones[0], nil
}
func (s *OpenTelekomCloudDnsProviderSolver) getTxtRecordSetsByZone(ch *v1alpha1.ChallengeRequest, zone *zones.Zone) ([]recordsets.RecordSet, error) {
action := strings.ToLower(string(ch.Action))
recordsetsListOpts := recordsets.ListOpts{
Name: ch.ResolvedFQDN,
Type: txtRecordSetType,
Data: getQuotedString(ch.Key),
}
allRecordPages, err := recordsets.ListByZone(s.dnsClient, zone.ID, recordsetsListOpts).AllPages()
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("%s failed", action))
}
allRecordSets, err := recordsets.ExtractRecordSets(allRecordPages)
if err != nil {
return nil, errors.Wrap(err, fmt.Sprintf("%s failed", action))
}
return allRecordSets, nil
}
func getQuotedString(s string) string {
if strings.HasPrefix(s, "\"") && strings.HasSuffix(s, "\"") {
return s
} else {
return strconv.Quote(s)
}
}