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// Package stackpath implements a DNS provider for solving the DNS-01 challenge using Stackpath DNS.
// https://developer.stackpath.com/en/api/dns/
package stackpath
import (
"context"
"errors"
"fmt"
"net/http"
"net/url"
"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"
"golang.org/x/oauth2/clientcredentials"
)
const (
defaultBaseURL = "https://gateway.stackpath.com/dns/v1/stacks/"
defaultAuthURL = "https://gateway.stackpath.com/identity/v1/oauth2/token"
)
// Environment variables names.
const (
envNamespace = "STACKPATH_"
EnvClientID = envNamespace + "CLIENT_ID"
EnvClientSecret = envNamespace + "CLIENT_SECRET"
EnvStackID = envNamespace + "STACK_ID"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
ClientID string
ClientSecret string
StackID string
TTL int
PropagationTimeout time.Duration
PollingInterval time.Duration
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, 120),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
BaseURL *url.URL
client *http.Client
config *Config
}
// NewDNSProvider returns a DNSProvider instance configured for Stackpath.
// Credentials must be passed in the environment variables:
// STACKPATH_CLIENT_ID, STACKPATH_CLIENT_SECRET, and STACKPATH_STACK_ID.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvClientID, EnvClientSecret, EnvStackID)
if err != nil {
return nil, fmt.Errorf("stackpath: %w", err)
}
config := NewDefaultConfig()
config.ClientID = values[EnvClientID]
config.ClientSecret = values[EnvClientSecret]
config.StackID = values[EnvStackID]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Stackpath.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("stackpath: the configuration of the DNS provider is nil")
}
if config.ClientID == "" || config.ClientSecret == "" {
return nil, errors.New("stackpath: credentials missing")
}
if config.StackID == "" {
return nil, errors.New("stackpath: stack id missing")
}
baseURL, _ := url.Parse(defaultBaseURL)
return &DNSProvider{
BaseURL: baseURL,
client: getOathClient(config),
config: config,
}, nil
}
func getOathClient(config *Config) *http.Client {
oathConfig := &clientcredentials.Config{
TokenURL: defaultAuthURL,
ClientID: config.ClientID,
ClientSecret: config.ClientSecret,
}
return oathConfig.Client(context.Background())
}
// 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.getZones(fqdn)
if err != nil {
return fmt.Errorf("stackpath: %w", err)
}
record := Record{
Name: extractRecordName(fqdn, zone.Domain),
Type: "TXT",
TTL: d.config.TTL,
Data: value,
}
return d.createZoneRecord(zone, record)
}
// 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.getZones(fqdn)
if err != nil {
return fmt.Errorf("stackpath: %w", err)
}
recordName := extractRecordName(fqdn, zone.Domain)
records, err := d.getZoneRecords(recordName, zone)
if err != nil {
return err
}
for _, record := range records {
err = d.deleteZoneRecord(zone, record)
if err != nil {
log.Printf("stackpath: failed to delete TXT record: %v", 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 extractRecordName(fqdn, zone string) string {
name := dns01.UnFqdn(fqdn)
if idx := strings.Index(name, "."+zone); idx != -1 {
return name[:idx]
}
return name
}
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