143 lines
4 KiB
Go
143 lines
4 KiB
Go
// Package ipv64 implements a DNS provider for solving the DNS-01 challenge using IPv64.
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// See https://ipv64.net/healthcheck_updater_api for more info on updating TXT records.
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package ipv64
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"time"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/go-acme/lego/v4/platform/config/env"
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"github.com/go-acme/lego/v4/providers/dns/ipv64/internal"
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"github.com/miekg/dns"
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)
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// Environment variables names.
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const (
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envNamespace = "IPV64_"
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EnvAPIKey = envNamespace + "API_KEY"
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EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
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EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
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EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
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EnvSequenceInterval = envNamespace + "SEQUENCE_INTERVAL" // Deprecated: unused, will be removed in v5.
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)
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// Config is used to configure the creation of the DNSProvider.
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type Config struct {
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APIKey string
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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HTTPClient *http.Client
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SequenceInterval time.Duration // Deprecated: unused, will be removed in v5.
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}
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// NewDefaultConfig returns a default configuration for the DNSProvider.
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func NewDefaultConfig() *Config {
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return &Config{
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PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
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PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
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},
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}
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}
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// DNSProvider implements the challenge.Provider interface.
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type DNSProvider struct {
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config *Config
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client *internal.Client
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}
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// NewDNSProvider returns a new DNS provider using
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// environment variable IPV64_TOKEN for adding and removing the DNS record.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get(EnvAPIKey)
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if err != nil {
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return nil, fmt.Errorf("ipv64: %w", err)
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}
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config := NewDefaultConfig()
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config.APIKey = values[EnvAPIKey]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for IPv64.
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func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
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if config == nil {
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return nil, errors.New("ipv64: the configuration of the DNS provider is nil")
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}
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if config.APIKey == "" {
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return nil, errors.New("ipv64: credentials missing")
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}
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client := internal.NewClient(internal.OAuthStaticAccessToken(config.HTTPClient, config.APIKey))
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if config.HTTPClient != nil {
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client.HTTPClient = config.HTTPClient
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}
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return &DNSProvider{config: config, client: client}, nil
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}
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// Present creates a TXT record to fulfill the dns-01 challenge.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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info := dns01.GetChallengeInfo(domain, keyAuth)
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sub, root, err := splitDomain(dns01.UnFqdn(info.EffectiveFQDN))
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if err != nil {
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return fmt.Errorf("ipv64: %w", err)
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}
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err = d.client.AddRecord(context.Background(), root, sub, "TXT", info.Value)
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if err != nil {
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return fmt.Errorf("ipv64: %w", err)
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}
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return nil
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}
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// CleanUp clears IPv64 TXT record.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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info := dns01.GetChallengeInfo(domain, keyAuth)
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sub, root, err := splitDomain(dns01.UnFqdn(info.EffectiveFQDN))
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if err != nil {
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return fmt.Errorf("ipv64: %w", err)
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}
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err = d.client.DeleteRecord(context.Background(), root, sub, "TXT", info.Value)
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if err != nil {
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return fmt.Errorf("ipv64: %w", err)
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}
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return nil
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}
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// Timeout returns the timeout and interval to use when checking for DNS propagation.
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// Adjusting here to cope with spikes in propagation times.
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func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
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return d.config.PropagationTimeout, d.config.PollingInterval
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}
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func splitDomain(full string) (string, string, error) {
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split := dns.Split(full)
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if len(split) < 3 {
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return "", "", fmt.Errorf("unsupported domain: %s", full)
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}
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if len(split) == 3 {
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return "", full, nil
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}
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domain := full[split[len(split)-3]:]
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subDomain := full[:split[len(split)-3]-1]
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return subDomain, domain, nil
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}
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