traefik/vendor/github.com/go-acme/lego/providers/dns/duckdns/duckdns.go

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// Package duckdns implements a DNS provider for solving the DNS-01 challenge using DuckDNS.
// See http://www.duckdns.org/spec.jsp for more info on updating TXT records.
package duckdns
import (
"errors"
"fmt"
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"net/http"
"time"
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"github.com/go-acme/lego/challenge/dns01"
"github.com/go-acme/lego/platform/config/env"
)
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// Config is used to configure the creation of the DNSProvider
type Config struct {
Token string
PropagationTimeout time.Duration
PollingInterval time.Duration
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SequenceInterval time.Duration
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HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
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PropagationTimeout: env.GetOrDefaultSecond("DUCKDNS_PROPAGATION_TIMEOUT", dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("DUCKDNS_POLLING_INTERVAL", dns01.DefaultPollingInterval),
SequenceInterval: env.GetOrDefaultSecond("DUCKDNS_SEQUENCE_INTERVAL", dns01.DefaultPropagationTimeout),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("DUCKDNS_HTTP_TIMEOUT", 30*time.Second),
},
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}
}
// DNSProvider adds and removes the record for the DNS challenge
type DNSProvider struct {
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config *Config
}
// NewDNSProvider returns a new DNS provider using
// environment variable DUCKDNS_TOKEN for adding and removing the DNS record.
func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get("DUCKDNS_TOKEN")
if err != nil {
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return nil, fmt.Errorf("duckdns: %v", err)
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}
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config := NewDefaultConfig()
config.Token = values["DUCKDNS_TOKEN"]
return NewDNSProviderConfig(config)
}
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// NewDNSProviderConfig return a DNSProvider instance configured for DuckDNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("duckdns: the configuration of the DNS provider is nil")
}
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if config.Token == "" {
return nil, errors.New("duckdns: credentials missing")
}
return &DNSProvider{config: config}, nil
}
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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)
return d.updateTxtRecord(domain, d.config.Token, txtRecord, false)
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}
// CleanUp clears DuckDNS TXT record
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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}
// 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
}
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// Sequential All DNS challenges for this provider will be resolved sequentially.
// Returns the interval between each iteration.
func (d *DNSProvider) Sequential() time.Duration {
return d.config.SequenceInterval
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}