/
dyn.go
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/
dyn.go
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// Package dyn implements a DNS provider for solving the DNS-01 challenge
// using Dyn Managed DNS.
package dyn
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
"strconv"
"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 {
CustomerName string
UserName string
Password string
HTTPClient *http.Client
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("DYN_TTL", 120),
PropagationTimeout: env.GetOrDefaultSecond("DYN_PROPAGATION_TIMEOUT", acme.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("DYN_POLLING_INTERVAL", acme.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("DYN_HTTP_TIMEOUT", 10*time.Second),
},
}
}
// DNSProvider is an implementation of the acme.ChallengeProvider interface that uses
// Dyn's Managed DNS API to manage TXT records for a domain.
type DNSProvider struct {
config *Config
token string
}
// NewDNSProvider returns a DNSProvider instance configured for Dyn DNS.
// Credentials must be passed in the environment variables:
// DYN_CUSTOMER_NAME, DYN_USER_NAME and DYN_PASSWORD.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("DYN_CUSTOMER_NAME", "DYN_USER_NAME", "DYN_PASSWORD")
if err != nil {
return nil, fmt.Errorf("dyn: %v", err)
}
config := NewDefaultConfig()
config.CustomerName = values["DYN_CUSTOMER_NAME"]
config.UserName = values["DYN_USER_NAME"]
config.Password = values["DYN_PASSWORD"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderCredentials uses the supplied credentials
// to return a DNSProvider instance configured for Dyn DNS.
// Deprecated
func NewDNSProviderCredentials(customerName, userName, password string) (*DNSProvider, error) {
config := NewDefaultConfig()
config.CustomerName = customerName
config.UserName = userName
config.Password = password
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Dyn DNS
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("dyn: the configuration of the DNS provider is nil")
}
if config.CustomerName == "" || config.UserName == "" || config.Password == "" {
return nil, fmt.Errorf("dyn: credentials missing")
}
return &DNSProvider{config: config}, nil
}
// Present creates a TXT record using the specified parameters
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
err = d.login()
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
data := map[string]interface{}{
"rdata": map[string]string{
"txtdata": value,
},
"ttl": strconv.Itoa(d.config.TTL),
}
resource := fmt.Sprintf("TXTRecord/%s/%s/", authZone, fqdn)
_, err = d.sendRequest(http.MethodPost, resource, data)
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
err = d.publish(authZone, "Added TXT record for ACME dns-01 challenge using lego client")
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
return d.logout()
}
// CleanUp removes the TXT record matching the specified parameters
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
err = d.login()
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
resource := fmt.Sprintf("TXTRecord/%s/%s/", authZone, fqdn)
url := fmt.Sprintf("%s/%s", defaultBaseURL, resource)
req, err := http.NewRequest(http.MethodDelete, url, nil)
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Auth-Token", d.token)
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("dyn: API request failed to delete TXT record HTTP status code %d", resp.StatusCode)
}
err = d.publish(authZone, "Removed TXT record for ACME dns-01 challenge using lego client")
if err != nil {
return fmt.Errorf("dyn: %v", err)
}
return d.logout()
}
// 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
}
// Starts a new Dyn API Session. Authenticates using customerName, userName,
// password and receives a token to be used in for subsequent requests.
func (d *DNSProvider) login() error {
payload := &creds{Customer: d.config.CustomerName, User: d.config.UserName, Pass: d.config.Password}
dynRes, err := d.sendRequest(http.MethodPost, "Session", payload)
if err != nil {
return err
}
var s session
err = json.Unmarshal(dynRes.Data, &s)
if err != nil {
return err
}
d.token = s.Token
return nil
}
// Destroys Dyn Session
func (d *DNSProvider) logout() error {
if len(d.token) == 0 {
// nothing to do
return nil
}
url := fmt.Sprintf("%s/Session", defaultBaseURL)
req, err := http.NewRequest(http.MethodDelete, url, nil)
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Auth-Token", d.token)
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return err
}
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("API request failed to delete session with HTTP status code %d", resp.StatusCode)
}
d.token = ""
return nil
}
func (d *DNSProvider) publish(zone, notes string) error {
pub := &publish{Publish: true, Notes: notes}
resource := fmt.Sprintf("Zone/%s/", zone)
_, err := d.sendRequest(http.MethodPut, resource, pub)
return err
}
func (d *DNSProvider) sendRequest(method, resource string, payload interface{}) (*dynResponse, error) {
url := fmt.Sprintf("%s/%s", defaultBaseURL, resource)
body, err := json.Marshal(payload)
if err != nil {
return nil, err
}
req, err := http.NewRequest(method, url, bytes.NewReader(body))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
if len(d.token) > 0 {
req.Header.Set("Auth-Token", d.token)
}
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 500 {
return nil, fmt.Errorf("API request failed with HTTP status code %d", resp.StatusCode)
}
var dynRes dynResponse
err = json.NewDecoder(resp.Body).Decode(&dynRes)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("API request failed with HTTP status code %d: %s", resp.StatusCode, dynRes.Messages)
} else if resp.StatusCode == 307 {
// TODO add support for HTTP 307 response and long running jobs
return nil, fmt.Errorf("API request returned HTTP 307. This is currently unsupported")
}
if dynRes.Status == "failure" {
// TODO add better error handling
return nil, fmt.Errorf("API request failed: %s", dynRes.Messages)
}
return &dynRes, nil
}