forked from TrueCloudLab/lego
134 lines
3.3 KiB
Go
134 lines
3.3 KiB
Go
package internal
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"golang.org/x/time/rate"
|
|
)
|
|
|
|
const defaultBaseURL = "https://dyn.dns.he.net/nic/update"
|
|
|
|
const (
|
|
codeGood = "good"
|
|
codeNoChg = "nochg"
|
|
codeAbuse = "abuse"
|
|
codeBadAgent = "badagent"
|
|
codeBadAuth = "badauth"
|
|
codeInterval = "interval"
|
|
codeNoHost = "nohost"
|
|
codeNotFqdn = "notfqdn"
|
|
)
|
|
|
|
const defaultBurst = 5
|
|
|
|
// Client the Hurricane Electric client.
|
|
type Client struct {
|
|
HTTPClient *http.Client
|
|
rateLimiters sync.Map
|
|
|
|
baseURL string
|
|
|
|
credentials map[string]string
|
|
credMu sync.Mutex
|
|
}
|
|
|
|
// NewClient Creates a new Client.
|
|
func NewClient(credentials map[string]string) *Client {
|
|
return &Client{
|
|
HTTPClient: &http.Client{Timeout: 5 * time.Second},
|
|
baseURL: defaultBaseURL,
|
|
credentials: credentials,
|
|
}
|
|
}
|
|
|
|
// UpdateTxtRecord updates a TXT record.
|
|
func (c *Client) UpdateTxtRecord(ctx context.Context, domain string, txt string) error {
|
|
hostname := fmt.Sprintf("_acme-challenge.%s", domain)
|
|
|
|
c.credMu.Lock()
|
|
token, ok := c.credentials[domain]
|
|
c.credMu.Unlock()
|
|
|
|
if !ok {
|
|
return fmt.Errorf("hurricane: Domain %s not found in credentials, check your credentials map", domain)
|
|
}
|
|
|
|
data := url.Values{}
|
|
data.Set("password", token)
|
|
data.Set("hostname", hostname)
|
|
data.Set("txt", txt)
|
|
|
|
rl, _ := c.rateLimiters.LoadOrStore(hostname, rate.NewLimiter(limit(defaultBurst), defaultBurst))
|
|
|
|
err := rl.(*rate.Limiter).Wait(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
resp, err := c.HTTPClient.PostForm(c.baseURL, data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
defer func() { _ = resp.Body.Close() }()
|
|
|
|
bodyBytes, err := io.ReadAll(resp.Body)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
body := string(bytes.TrimSpace(bodyBytes))
|
|
|
|
if resp.StatusCode != http.StatusOK {
|
|
return fmt.Errorf("%d: attempt to change TXT record %s returned %s", resp.StatusCode, hostname, body)
|
|
}
|
|
|
|
return evaluateBody(body, hostname)
|
|
}
|
|
|
|
func evaluateBody(body string, hostname string) error {
|
|
words := strings.SplitN(body, " ", 2)
|
|
|
|
switch words[0] {
|
|
case codeGood:
|
|
return nil
|
|
case codeNoChg:
|
|
log.Printf("%s: unchanged content written to TXT record %s", body, hostname)
|
|
return nil
|
|
case codeAbuse:
|
|
return fmt.Errorf("%s: blocked hostname for abuse: %s", body, hostname)
|
|
case codeBadAgent:
|
|
return fmt.Errorf("%s: user agent not sent or HTTP method not recognized; open an issue on go-acme/lego on Github", body)
|
|
case codeBadAuth:
|
|
return fmt.Errorf("%s: wrong authentication token provided for TXT record %s", body, hostname)
|
|
case codeInterval:
|
|
return fmt.Errorf("%s: TXT records update exceeded API rate limit", body)
|
|
case codeNoHost:
|
|
return fmt.Errorf("%s: the record provided does not exist in this account: %s", body, hostname)
|
|
case codeNotFqdn:
|
|
return fmt.Errorf("%s: the record provided isn't an FQDN: %s", body, hostname)
|
|
default:
|
|
// This is basically only server errors.
|
|
return fmt.Errorf("attempt to change TXT record %s returned %s", hostname, body)
|
|
}
|
|
}
|
|
|
|
// limit computes the rate based on burst.
|
|
// The API rate limit per-record is 10 reqs / 2 minutes.
|
|
//
|
|
// 10 reqs / 2 minutes = freq 1/12 (burst = 1)
|
|
// 6 reqs / 2 minutes = freq 1/20 (burst = 5)
|
|
//
|
|
// https://github.com/go-acme/lego/issues/1415
|
|
func limit(burst int) rate.Limit {
|
|
return 1 / rate.Limit(120/(10-burst+1))
|
|
}
|