// Package namesilo implements a DNS provider for solving the DNS-01 challenge using namesilo DNS. package namesilo import ( "errors" "fmt" "strings" "time" "github.com/go-acme/lego/v4/challenge/dns01" "github.com/go-acme/lego/v4/platform/config/env" "github.com/nrdcg/namesilo" ) const ( defaultTTL = 3600 maxTTL = 2592000 ) // Environment variables names. const ( envNamespace = "NAMESILO_" 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 { APIKey string 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, defaultTTL), PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout), PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval), } } // DNSProvider implements the challenge.Provider interface. type DNSProvider struct { client *namesilo.Client config *Config } // NewDNSProvider returns a DNSProvider instance configured for namesilo. // API_KEY must be passed in the environment variables: NAMESILO_API_KEY. // // See: https://www.namesilo.com/api_reference.php func NewDNSProvider() (*DNSProvider, error) { values, err := env.Get(EnvAPIKey) if err != nil { return nil, fmt.Errorf("namesilo: %w", err) } config := NewDefaultConfig() config.APIKey = values[EnvAPIKey] return NewDNSProviderConfig(config) } // NewDNSProviderConfig return a DNSProvider instance configured for Namesilo. func NewDNSProviderConfig(config *Config) (*DNSProvider, error) { if config == nil { return nil, errors.New("namesilo: the configuration of the DNS provider is nil") } if config.TTL < defaultTTL || config.TTL > maxTTL { return nil, fmt.Errorf("namesilo: TTL should be in [%d, %d]", defaultTTL, maxTTL) } transport, err := namesilo.NewTokenTransport(config.APIKey) if err != nil { return nil, fmt.Errorf("namesilo: %w", err) } return &DNSProvider{client: namesilo.NewClient(transport.Client()), config: config}, nil } // 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) zoneName, err := getZoneNameByDomain(fqdn) if err != nil { return fmt.Errorf("namesilo: %w", err) } _, err = d.client.DnsAddRecord(&namesilo.DnsAddRecordParams{ Domain: zoneName, Type: "TXT", Host: getRecordName(fqdn, zoneName), Value: value, TTL: d.config.TTL, }) if err != nil { return fmt.Errorf("namesilo: failed to add record %w", err) } return nil } // CleanUp removes the TXT record matching the specified parameters. func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error { fqdn, _ := dns01.GetRecord(domain, keyAuth) zoneName, err := getZoneNameByDomain(fqdn) if err != nil { return fmt.Errorf("namesilo: %w", err) } resp, err := d.client.DnsListRecords(&namesilo.DnsListRecordsParams{Domain: zoneName}) if err != nil { return fmt.Errorf("namesilo: %w", err) } var lastErr error name := getRecordName(fqdn, zoneName) for _, r := range resp.Reply.ResourceRecord { if r.Type == "TXT" && (r.Host == name || r.Host == dns01.UnFqdn(fqdn)) { _, err := d.client.DnsDeleteRecord(&namesilo.DnsDeleteRecordParams{Domain: zoneName, ID: r.RecordID}) if err != nil { lastErr = fmt.Errorf("namesilo: %w", err) } } } return lastErr } // 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 getZoneNameByDomain(domain string) (string, error) { zone, err := dns01.FindZoneByFqdn(domain) if err != nil { return "", fmt.Errorf("failed to find zone for domain: %s, %w", domain, err) } return dns01.UnFqdn(zone), nil } func getRecordName(domain, zone string) string { return strings.TrimSuffix(dns01.ToFqdn(domain), "."+dns01.ToFqdn(zone)) }