lego/providers/dns/duckdns/duckdns.go
Ludovic Fernandez bba134ce87
Allow to configure TTL, interval and timeout (#634)
* feat: add GetOrDefaultXXX methods.
* refactor: configuration (alidns).
* refactor: configuration (azure).
* refactor: configuration (auroradns).
* refactor: configuration (bluecat).
* refactor: configuration (cloudflare).
* refactor: configuration (digitalocean).
* refactor: configuration (dnsimple).
* refactor: configuration (dnmadeeasy).
* refactor: configuration (dnspod).
* refactor: configuration (duckdns).
* refactor: configuration (dyn).
* refactor: configuration (exoscale).
* refactor: configuration (fastdns).
* refactor: configuration (gandi).
* refactor: configuration (gandiv5).
* refactor: configuration (gcloud).
* refactor: configuration (glesys).
* refactor: configuration (godaddy).
* refactor: configuration (iij).
* refactor: configuration (lightsail).
* refactor: configuration (linode).
* refactor: configuration (namecheap).
* refactor: configuration (namedotcom).
* refactor: configuration (netcup).
* refactor: configuration (nifcloud).
* refactor: configuration (ns1).
* refactor: configuration (otc).
* refactor: configuration (ovh).
* refactor: configuration (pdns).
* refactor: configuration (rackspace).
* refactor: configuration (rfc2136).
* refactor: configuration (route53).
* refactor: configuration (sakuracloud).
* refactor: configuration (vegadns).
* refactor: configuration (vultr).
2018-09-15 19:07:24 +02:00

117 lines
3.6 KiB
Go

// Package duckdns Adds lego support for http://duckdns.org.
// See http://www.duckdns.org/spec.jsp for more info on updating TXT records.
package duckdns
import (
"errors"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/platform/config/env"
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
Token string
PropagationTimeout time.Duration
PollingInterval time.Duration
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
client := acme.HTTPClient
client.Timeout = env.GetOrDefaultSecond("DUCKDNS_HTTP_TIMEOUT", 30*time.Second)
return &Config{
PropagationTimeout: env.GetOrDefaultSecond("DUCKDNS_PROPAGATION_TIMEOUT", acme.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("DUCKDNS_POLLING_INTERVAL", acme.DefaultPollingInterval),
HTTPClient: &client,
}
}
// DNSProvider adds and removes the record for the DNS challenge
type DNSProvider struct {
config *Config
}
// NewDNSProvider returns a new DNS provider using
// environment variable DUCKDNS_TOKEN for adding and removing the DNS record.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("DUCKDNS_TOKEN")
if err != nil {
return nil, fmt.Errorf("duckdns: %v", err)
}
config := NewDefaultConfig()
config.Token = values["DUCKDNS_TOKEN"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderCredentials uses the supplied credentials
// to return a DNSProvider instance configured for http://duckdns.org
// Deprecated
func NewDNSProviderCredentials(token string) (*DNSProvider, error) {
config := NewDefaultConfig()
config.Token = token
return NewDNSProviderConfig(config)
}
// 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")
}
if config.Token == "" {
return nil, errors.New("duckdns: credentials missing")
}
return &DNSProvider{config: config}, nil
}
// Present creates a TXT record to fulfil the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
_, txtRecord, _ := acme.DNS01Record(domain, keyAuth)
return updateTxtRecord(domain, d.config.Token, txtRecord, false)
}
// CleanUp clears DuckDNS TXT record
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
return updateTxtRecord(domain, d.config.Token, "", true)
}
// 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
}
// updateTxtRecord Update the domains TXT record
// To update the TXT record we just need to make one simple get request.
// In DuckDNS you only have one TXT record shared with the domain and all sub domains.
func updateTxtRecord(domain, token, txt string, clear bool) error {
u := fmt.Sprintf("https://www.duckdns.org/update?domains=%s&token=%s&clear=%t&txt=%s", domain, token, clear, txt)
response, err := acme.HTTPClient.Get(u)
if err != nil {
return err
}
defer response.Body.Close()
bodyBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return err
}
body := string(bodyBytes)
if body != "OK" {
return fmt.Errorf("request to change TXT record for DuckDNS returned the following result (%s) this does not match expectation (OK) used url [%s]", body, u)
}
return nil
}