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// Package dyn implements a DNS provider for solving the DNS-01 challenge using Dyn Managed DNS.
package dyn
import (
"errors"
"fmt"
"net/http"
"strconv"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
)
// Environment variables names.
const (
envNamespace = "DYN_"
EnvCustomerName = envNamespace + "CUSTOMER_NAME"
EnvUserName = envNamespace + "USER_NAME"
EnvPassword = envNamespace + "PASSWORD"
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 {
CustomerName string
UserName string
Password string
HTTPClient *http.Client
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
}
// 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 {
config *Config
token string
}
// NewDNSProvider returns a DNSProvider instance configured for Dyn DNS.
// Credentials must be passed in the environment variables:
// DYN_CUSTOMER_NAME, DYN_USER_NAME and DYN_PASSWORD.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvCustomerName, EnvUserName, EnvPassword)
if err != nil {
return nil, fmt.Errorf("dyn: %w", err)
}
config := NewDefaultConfig()
config.CustomerName = values[EnvCustomerName]
config.UserName = values[EnvUserName]
config.Password = values[EnvPassword]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Dyn DNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("dyn: the configuration of the DNS provider is nil")
}
if config.CustomerName == "" || config.UserName == "" || config.Password == "" {
return nil, errors.New("dyn: credentials missing")
}
return &DNSProvider{config: config}, nil
}
// Present creates a TXT record using the specified parameters.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
err = d.login()
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
data := map[string]interface{}{
"rdata": map[string]string{
"txtdata": value,
},
"ttl": strconv.Itoa(d.config.TTL),
}
resource := fmt.Sprintf("TXTRecord/%s/%s/", authZone, fqdn)
_, err = d.sendRequest(http.MethodPost, resource, data)
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
err = d.publish(authZone, "Added TXT record for ACME dns-01 challenge using lego client")
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
return d.logout()
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
err = d.login()
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
resource := fmt.Sprintf("TXTRecord/%s/%s/", authZone, fqdn)
url := fmt.Sprintf("%s/%s", defaultBaseURL, resource)
req, err := http.NewRequest(http.MethodDelete, url, nil)
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Auth-Token", d.token)
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("dyn: API request failed to delete TXT record HTTP status code %d", resp.StatusCode)
}
err = d.publish(authZone, "Removed TXT record for ACME dns-01 challenge using lego client")
if err != nil {
return fmt.Errorf("dyn: %w", err)
}
return d.logout()
}
// 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
}
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