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ipv64.go
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ipv64.go
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// Package ipv64 implements a DNS provider for solving the DNS-01 challenge using IPv64.
// See https://ipv64.net/healthcheck_updater_api for more info on updating TXT records.
package ipv64
import (
"context"
"errors"
"fmt"
"net/http"
"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/ipv64/internal"
"github.com/miekg/dns"
)
// Environment variables names.
const (
envNamespace = "IPV64_"
EnvAPIKey = envNamespace + "API_KEY"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
EnvSequenceInterval = envNamespace + "SEQUENCE_INTERVAL" // Deprecated: unused, will be removed in v5.
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
APIKey string
PropagationTimeout time.Duration
PollingInterval time.Duration
HTTPClient *http.Client
SequenceInterval time.Duration // Deprecated: unused, will be removed in v5.
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
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
}
// NewDNSProvider returns a new DNS provider using
// environment variable IPV64_TOKEN for adding and removing the DNS record.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIKey)
if err != nil {
return nil, fmt.Errorf("ipv64: %w", err)
}
config := NewDefaultConfig()
config.APIKey = values[EnvAPIKey]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for IPv64.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("ipv64: the configuration of the DNS provider is nil")
}
if config.APIKey == "" {
return nil, errors.New("ipv64: credentials missing")
}
client := internal.NewClient(internal.OAuthStaticAccessToken(config.HTTPClient, config.APIKey))
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{config: config, client: client}, nil
}
// Present creates a TXT record to fulfill the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
sub, root, err := splitDomain(dns01.UnFqdn(info.EffectiveFQDN))
if err != nil {
return fmt.Errorf("ipv64: %w", err)
}
err = d.client.AddRecord(context.Background(), root, sub, "TXT", info.Value)
if err != nil {
return fmt.Errorf("ipv64: %w", err)
}
return nil
}
// CleanUp clears IPv64 TXT record.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
sub, root, err := splitDomain(dns01.UnFqdn(info.EffectiveFQDN))
if err != nil {
return fmt.Errorf("ipv64: %w", err)
}
err = d.client.DeleteRecord(context.Background(), root, sub, "TXT", info.Value)
if err != nil {
return fmt.Errorf("ipv64: %w", 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 splitDomain(full string) (string, string, error) {
split := dns.Split(full)
if len(split) < 3 {
return "", "", fmt.Errorf("unsupported domain: %s", full)
}
if len(split) == 3 {
return "", full, nil
}
domain := full[split[len(split)-3]:]
subDomain := full[:split[len(split)-3]-1]
return subDomain, domain, nil
}