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// Package ns1 implements a DNS provider for solving the DNS-01 challenge using NS1 DNS.
package ns1
import (
"errors"
"fmt"
"net/http"
"strings"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/log"
"github.com/go-acme/lego/v4/platform/config/env"
"gopkg.in/ns1/ns1-go.v2/rest"
"gopkg.in/ns1/ns1-go.v2/rest/model/dns"
)
// Environment variables names.
const (
envNamespace = "NS1_"
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, dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 10*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
client *rest.Client
config *Config
}
// NewDNSProvider returns a DNSProvider instance configured for NS1.
// Credentials must be passed in the environment variables: NS1_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIKey)
if err != nil {
return nil, fmt.Errorf("ns1: %w", err)
}
config := NewDefaultConfig()
config.APIKey = values[EnvAPIKey]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for NS1.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("ns1: the configuration of the DNS provider is nil")
}
if config.APIKey == "" {
return nil, errors.New("ns1: credentials missing")
}
client := rest.NewClient(config.HTTPClient, rest.SetAPIKey(config.APIKey))
return &DNSProvider{client: client, config: config}, nil
}
// 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 := d.getHostedZone(fqdn)
if err != nil {
return fmt.Errorf("ns1: %w", err)
}
record, _, err := d.client.Records.Get(zone.Zone, dns01.UnFqdn(fqdn), "TXT")
// Create a new record
if errors.Is(err, rest.ErrRecordMissing) || record == nil {
log.Infof("Create a new record for [zone: %s, fqdn: %s, domain: %s]", zone.Zone, fqdn, domain)
record = dns.NewRecord(zone.Zone, dns01.UnFqdn(fqdn), "TXT")
record.TTL = d.config.TTL
record.Answers = []*dns.Answer{{Rdata: []string{value}}}
_, err = d.client.Records.Create(record)
if err != nil {
return fmt.Errorf("ns1: failed to create record [zone: %q, fqdn: %q]: %w", zone.Zone, fqdn, err)
}
return nil
}
if err != nil {
return fmt.Errorf("ns1: failed to get the existing record: %w", err)
}
// Update the existing records
record.Answers = append(record.Answers, &dns.Answer{Rdata: []string{value}})
log.Infof("Update an existing record for [zone: %s, fqdn: %s, domain: %s]", zone.Zone, fqdn, domain)
_, err = d.client.Records.Update(record)
if err != nil {
return fmt.Errorf("ns1: failed to update record [zone: %q, fqdn: %q]: %w", zone.Zone, fqdn, err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
zone, err := d.getHostedZone(fqdn)
if err != nil {
return fmt.Errorf("ns1: %w", err)
}
name := dns01.UnFqdn(fqdn)
_, err = d.client.Records.Delete(zone.Zone, name, "TXT")
if err != nil {
return fmt.Errorf("ns1: failed to delete record [zone: %q, domain: %q]: %w", zone.Zone, name, err)
}
return 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
}
func (d *DNSProvider) getHostedZone(fqdn string) (*dns.Zone, error) {
authZone, err := getAuthZone(fqdn)
if err != nil {
return nil, fmt.Errorf("failed to extract auth zone from fqdn %q: %w", fqdn, err)
}
zone, _, err := d.client.Zones.Get(authZone)
if err != nil {
return nil, fmt.Errorf("failed to get zone [authZone: %q, fqdn: %q]: %w", authZone, fqdn, err)
}
return zone, nil
}
func getAuthZone(fqdn string) (string, error) {
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return "", err
}
return strings.TrimSuffix(authZone, "."), nil
}
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