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// Package safedns implements a DNS provider for solving the DNS-01 challenge using UKFast SafeDNS.
package safedns
import (
"errors"
"fmt"
"net/http"
"sync"
"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/safedns/internal"
)
// Environment variables.
const (
envNamespace = "SAFEDNS_"
EnvAuthToken = envNamespace + "AUTH_TOKEN"
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 {
AuthToken string
TTL int
PropagationTimeout time.Duration
PollingInterval time.Duration
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, 30*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *internal.Client
recordIDs map[string]int
recordIDsMu sync.Mutex
}
// NewDNSProvider returns a DNSProvider instance.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAuthToken)
if err != nil {
return nil, fmt.Errorf("safedns: %w", err)
}
config := NewDefaultConfig()
config.AuthToken = values[EnvAuthToken]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for UKFast SafeDNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("safedns: supplied configuration was nil")
}
if config.AuthToken == "" {
return nil, errors.New("safedns: credentials missing")
}
client := internal.NewClient(config.AuthToken)
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{
config: config,
client: client,
recordIDs: make(map[string]int),
}, 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 := dns01.FindZoneByFqdn(dns01.ToFqdn(fqdn))
if err != nil {
return fmt.Errorf("safedns: could not determine zone for domain: %q: %w", fqdn, err)
}
record := internal.Record{
Name: dns01.UnFqdn(fqdn),
Type: "TXT",
Content: fmt.Sprintf("%q", value),
TTL: d.config.TTL,
}
resp, err := d.client.AddRecord(zone, record)
if err != nil {
return fmt.Errorf("safedns: %w", err)
}
d.recordIDsMu.Lock()
d.recordIDs[token] = resp.Data.ID
d.recordIDsMu.Unlock()
return nil
}
// CleanUp removes the TXT record previously created.
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("safedns: %w", err)
}
d.recordIDsMu.Lock()
recordID, ok := d.recordIDs[token]
d.recordIDsMu.Unlock()
if !ok {
return fmt.Errorf("safedns: unknown record ID for '%s'", fqdn)
}
err = d.client.RemoveRecord(authZone, recordID)
if err != nil {
return fmt.Errorf("safedns: %w", err)
}
d.recordIDsMu.Lock()
delete(d.recordIDs, token)
d.recordIDsMu.Unlock()
return nil
}
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