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metaname.go
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metaname.go
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// Package metaname implements a DNS provider for solving the DNS-01 challenge using Metaname.
package metaname
import (
"context"
"errors"
"fmt"
"sync"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
"github.com/nzdjb/go-metaname"
)
// Environment variables names.
const (
envNamespace = "METANAME_"
EnvAccountReference = envNamespace + "ACCOUNT_REFERENCE"
EnvAPIKey = envNamespace + "API_KEY"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
AccountReference string
APIKey string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
}
// 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),
TTL: env.GetOrDefaultInt(EnvTTL, dns01.DefaultTTL),
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *metaname.MetanameClient
records map[string]string
recordsMu sync.Mutex
}
// NewDNSProvider returns a new DNS provider
// using environment variable METANAME_API_KEY for adding and removing the DNS record.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAccountReference, EnvAPIKey)
if err != nil {
return nil, fmt.Errorf("metaname: %w", err)
}
config := NewDefaultConfig()
config.AccountReference = values[EnvAccountReference]
config.APIKey = values[EnvAPIKey]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Metaname.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("metaname: the configuration of the DNS provider is nil")
}
if config.AccountReference == "" {
return nil, errors.New("metaname: missing account reference")
}
if config.APIKey == "" {
return nil, errors.New("metaname: missing api key")
}
return &DNSProvider{
config: config,
client: metaname.NewMetanameClient(config.AccountReference, config.APIKey),
records: make(map[string]string),
}, nil
}
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("metaname: could not find zone for domain %q (%s): %w", domain, info.EffectiveFQDN, err)
}
authZone = dns01.UnFqdn(authZone)
subDomain, err := dns01.ExtractSubDomain(info.EffectiveFQDN, authZone)
if err != nil {
return fmt.Errorf("metaname: could not extract subDomain: %w", err)
}
ctx := context.Background()
r := metaname.ResourceRecord{
Name: subDomain,
Type: "TXT",
Aux: nil,
Ttl: d.config.TTL,
Data: info.Value,
}
ref, err := d.client.CreateDnsRecord(ctx, authZone, r)
if err != nil {
return fmt.Errorf("metaname: add record: %w", err)
}
d.recordsMu.Lock()
d.records[token] = ref
d.recordsMu.Unlock()
return nil
}
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("metaname: could not find zone for domain %q (%s): %w", domain, info.EffectiveFQDN, err)
}
authZone = dns01.UnFqdn(authZone)
ctx := context.Background()
d.recordsMu.Lock()
ref, ok := d.records[token]
d.recordsMu.Unlock()
if !ok {
return fmt.Errorf("metaname: unknown ref for %s", info.EffectiveFQDN)
}
err = d.client.DeleteDnsRecord(ctx, authZone, ref)
if err != nil {
return fmt.Errorf("metaname: delete record: %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
}