103 lines
2.6 KiB
Go
103 lines
2.6 KiB
Go
package internal
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
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"github.com/miekg/dns"
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)
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const defaultBaseURL = "https://www.duckdns.org/update"
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// Client the DuckDNS API client.
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type Client struct {
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token string
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HTTPClient *http.Client
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}
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// NewClient Creates a new Client.
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func NewClient(token string) *Client {
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return &Client{
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token: token,
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HTTPClient: &http.Client{Timeout: 5 * time.Second},
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}
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}
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func (c Client) AddTXTRecord(ctx context.Context, domain, value string) error {
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return c.UpdateTxtRecord(ctx, domain, value, false)
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}
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func (c Client) RemoveTXTRecord(ctx context.Context, domain string) error {
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return c.UpdateTxtRecord(ctx, domain, "", true)
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}
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// UpdateTxtRecord Update the domains TXT record
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// To update the TXT record we just need to make one simple get request.
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// In DuckDNS you only have one TXT record shared with the domain and all subdomains.
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func (c Client) UpdateTxtRecord(ctx context.Context, domain, txt string, clearRecord bool) error {
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endpoint, _ := url.Parse(defaultBaseURL)
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mainDomain := getMainDomain(domain)
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if mainDomain == "" {
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return fmt.Errorf("unable to find the main domain for: %s", domain)
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}
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query := endpoint.Query()
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query.Set("domains", mainDomain)
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query.Set("token", c.token)
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query.Set("clear", strconv.FormatBool(clearRecord))
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query.Set("txt", txt)
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endpoint.RawQuery = query.Encode()
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint.String(), http.NoBody)
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if err != nil {
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return fmt.Errorf("unable to create request: %w", err)
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}
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resp, err := c.HTTPClient.Do(req)
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if err != nil {
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return errutils.NewHTTPDoError(req, err)
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}
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defer func() { _ = resp.Body.Close() }()
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raw, err := io.ReadAll(resp.Body)
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if err != nil {
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return errutils.NewReadResponseError(req, resp.StatusCode, err)
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}
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body := string(raw)
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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, endpoint)
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}
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return nil
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}
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// DuckDNS only lets you write to your subdomain.
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// It must be in format subdomain.duckdns.org,
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// not in format subsubdomain.subdomain.duckdns.org.
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// So strip off everything that is not top 3 levels.
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func getMainDomain(domain string) string {
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domain = dns01.UnFqdn(domain)
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split := dns.Split(domain)
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if strings.HasSuffix(strings.ToLower(domain), "duckdns.org") {
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if len(split) < 3 {
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return ""
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}
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firstSubDomainIndex := split[len(split)-3]
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return domain[firstSubDomainIndex:]
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}
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return domain[split[len(split)-1]:]
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}
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