102 lines
3.2 KiB
Go
102 lines
3.2 KiB
Go
// Package duckdns implements a DNS provider for solving the DNS-01 challenge using DuckDNS.
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// See http://www.duckdns.org/spec.jsp for more info on updating TXT records.
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package duckdns
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import (
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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/v3/challenge/dns01"
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"github.com/go-acme/lego/v3/platform/config/env"
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)
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// Environment variables names.
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const (
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envNamespace = "DUCKDNS_"
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EnvToken = envNamespace + "TOKEN"
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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"
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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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Token string
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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SequenceInterval time.Duration
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HTTPClient *http.Client
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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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SequenceInterval: env.GetOrDefaultSecond(EnvSequenceInterval, dns01.DefaultPropagationTimeout),
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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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}
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// NewDNSProvider returns a new DNS provider using
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// environment variable DUCKDNS_TOKEN for adding and removing the DNS record.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get(EnvToken)
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if err != nil {
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return nil, fmt.Errorf("duckdns: %w", err)
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}
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config := NewDefaultConfig()
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config.Token = values[EnvToken]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for DuckDNS.
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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("duckdns: the configuration of the DNS provider is nil")
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}
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if config.Token == "" {
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return nil, errors.New("duckdns: credentials missing")
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}
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return &DNSProvider{config: config}, 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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_, txtRecord := dns01.GetRecord(domain, keyAuth)
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return d.updateTxtRecord(domain, d.config.Token, txtRecord, false)
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}
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// CleanUp clears DuckDNS TXT record.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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return d.updateTxtRecord(domain, d.config.Token, "", true)
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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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// Sequential All DNS challenges for this provider will be resolved sequentially.
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// Returns the interval between each iteration.
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func (d *DNSProvider) Sequential() time.Duration {
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return d.config.SequenceInterval
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}
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