82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Adds lego support for http://duckdns.org .
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//
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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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"io/ioutil"
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"os"
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"github.com/xenolf/lego/acmev2"
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)
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// DNSProvider adds and removes the record for the DNS challenge
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type DNSProvider struct {
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// The duckdns api token
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token string
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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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duckdnsToken := os.Getenv("DUCKDNS_TOKEN")
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return NewDNSProviderCredentials(duckdnsToken)
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}
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// NewDNSProviderCredentials uses the supplied credentials to return a
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// DNSProvider instance configured for http://duckdns.org .
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func NewDNSProviderCredentials(duckdnsToken string) (*DNSProvider, error) {
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if duckdnsToken == "" {
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return nil, errors.New("environment variable DUCKDNS_TOKEN not set")
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}
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return &DNSProvider{token: duckdnsToken}, nil
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}
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// makeDuckdnsURL creates a url to clear the set or unset the TXT record.
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// txt == "" will clear the TXT record.
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func makeDuckdnsURL(domain, token, txt string) string {
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requestBase := fmt.Sprintf("https://www.duckdns.org/update?domains=%s&token=%s", domain, token)
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if txt == "" {
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return requestBase + "&clear=true"
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}
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return requestBase + "&txt=" + txt
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}
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func issueDuckdnsRequest(url string) error {
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response, err := acmev2.HTTPClient.Get(url)
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if err != nil {
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return err
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}
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defer response.Body.Close()
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bodyBytes, err := ioutil.ReadAll(response.Body)
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if err != nil {
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return err
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}
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body := string(bodyBytes)
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if body != "OK" {
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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)
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}
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return nil
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}
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// Present creates a TXT record to fulfil the dns-01 challenge.
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// In duckdns you only have one TXT record shared with
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// the domain and all sub domains.
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//
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// To update the TXT record we just need to make one simple get request.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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_, txtRecord, _ := acmev2.DNS01Record(domain, keyAuth)
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url := makeDuckdnsURL(domain, d.token, txtRecord)
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return issueDuckdnsRequest(url)
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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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url := makeDuckdnsURL(domain, d.token, "")
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return issueDuckdnsRequest(url)
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}
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