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hetzner.go
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hetzner.go
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// Package hetzner implements a DNS provider for solving the DNS-01 challenge using Hetzner DNS.
package hetzner
import (
"errors"
"fmt"
"net/http"
"strings"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
"github.com/go-acme/lego/v4/providers/dns/hetzner/internal"
)
const minTTL = 600
// Environment variables names.
const (
envNamespace = "HETZNER_"
EnvAPIKey = envNamespace + "API_KEY"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
APIKey string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, minTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 120*time.Second),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 2*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *internal.Client
}
// NewDNSProvider returns a DNSProvider instance configured for hetzner.
// Credentials must be passed in the environment variable: HETZNER_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIKey)
if err != nil {
return nil, fmt.Errorf("hetzner: %w", err)
}
config := NewDefaultConfig()
config.APIKey = values[EnvAPIKey]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for hetzner.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("hetzner: the configuration of the DNS provider is nil")
}
if config.APIKey == "" {
return nil, errors.New("hetzner: credentials missing")
}
if config.TTL < minTTL {
return nil, fmt.Errorf("hetzner: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
}
client := internal.NewClient(config.APIKey)
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{config: config, client: client}, nil
}
// Timeout returns the timeout and interval to use when checking for DNS
// propagation. Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}
// Present creates a TXT record to fulfill the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zone, err := getZone(fqdn)
if err != nil {
return fmt.Errorf("hetzner: failed to find zone: fqdn=%s: %w", fqdn, err)
}
zoneID, err := d.client.GetZoneID(zone)
if err != nil {
return fmt.Errorf("hetzner: %w", err)
}
record := internal.DNSRecord{
Type: "TXT",
Name: extractRecordName(fqdn, zone),
Value: value,
TTL: d.config.TTL,
ZoneID: zoneID,
}
if err := d.client.CreateRecord(record); err != nil {
return fmt.Errorf("hetzner: failed to add TXT record: fqdn=%s, zoneID=%s: %w", fqdn, zoneID, err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zone, err := getZone(fqdn)
if err != nil {
return fmt.Errorf("hetzner: failed to find zone: fqdn=%s: %w", fqdn, err)
}
zoneID, err := d.client.GetZoneID(zone)
if err != nil {
return fmt.Errorf("hetzner: %w", err)
}
recordName := extractRecordName(fqdn, zone)
record, err := d.client.GetTxtRecord(recordName, value, zoneID)
if err != nil {
return fmt.Errorf("hetzner: %w", err)
}
if err := d.client.DeleteRecord(record.ID); err != nil {
return fmt.Errorf("hetzner: failed to delate TXT record: id=%s, name=%s: %w", record.ID, record.Name, err)
}
return nil
}
func extractRecordName(fqdn, zone string) string {
name := dns01.UnFqdn(fqdn)
if idx := strings.Index(name, "."+zone); idx != -1 {
return name[:idx]
}
return name
}
func getZone(fqdn string) (string, error) {
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return "", err
}
return dns01.UnFqdn(authZone), nil
}