81 lines
2.4 KiB
Go
81 lines
2.4 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"
|
|
"os"
|
|
|
|
"github.com/xenolf/lego/acme"
|
|
)
|
|
|
|
// DNSProvider adds and removes the record for the DNS challenge
|
|
type DNSProvider struct {
|
|
// The duckdns api token
|
|
token string
|
|
}
|
|
|
|
// NewDNSProvider returns a new DNS provider using
|
|
// environment variable DUCKDNS_TOKEN for adding and removing the DNS record.
|
|
func NewDNSProvider() (*DNSProvider, error) {
|
|
duckdnsToken := os.Getenv("DUCKDNS_TOKEN")
|
|
|
|
return NewDNSProviderCredentials(duckdnsToken)
|
|
}
|
|
|
|
// NewDNSProviderCredentials uses the supplied credentials to return a
|
|
// DNSProvider instance configured for http://duckdns.org .
|
|
func NewDNSProviderCredentials(duckdnsToken string) (*DNSProvider, error) {
|
|
if duckdnsToken == "" {
|
|
return nil, errors.New("environment variable DUCKDNS_TOKEN not set")
|
|
}
|
|
|
|
return &DNSProvider{token: duckdnsToken}, nil
|
|
}
|
|
|
|
// makeDuckdnsURL creates a url to clear the set or unset the TXT record.
|
|
// txt == "" will clear the TXT record.
|
|
func makeDuckdnsURL(domain, token, txt string) string {
|
|
requestBase := fmt.Sprintf("https://www.duckdns.org/update?domains=%s&token=%s", domain, token)
|
|
if txt == "" {
|
|
return requestBase + "&clear=true"
|
|
}
|
|
return requestBase + "&txt=" + txt
|
|
}
|
|
|
|
func issueDuckdnsRequest(url string) error {
|
|
response, err := acme.HTTPClient.Get(url)
|
|
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, url)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Present creates a TXT record to fulfil the dns-01 challenge.
|
|
// In duckdns you only have one TXT record shared with
|
|
// the domain and all sub domains.
|
|
//
|
|
// To update the TXT record we just need to make one simple get request.
|
|
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
|
|
_, txtRecord, _ := acme.DNS01Record(domain, keyAuth)
|
|
url := makeDuckdnsURL(domain, d.token, txtRecord)
|
|
return issueDuckdnsRequest(url)
|
|
}
|
|
|
|
// CleanUp clears duckdns TXT record
|
|
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
|
|
url := makeDuckdnsURL(domain, d.token, "")
|
|
return issueDuckdnsRequest(url)
|
|
}
|