traefik/vendor/github.com/xenolf/lego/providers/dns/namecheap/namecheap.go

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// Package namecheap implements a DNS provider for solving the DNS-01
// challenge using namecheap DNS.
package namecheap
import (
"encoding/xml"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"strings"
"time"
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"github.com/xenolf/lego/acme"
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)
// Notes about namecheap's tool API:
// 1. Using the API requires registration. Once registered, use your account
// name and API key to access the API.
// 2. There is no API to add or modify a single DNS record. Instead you must
// read the entire list of records, make modifications, and then write the
// entire updated list of records. (Yuck.)
// 3. Namecheap's DNS updates can be slow to propagate. I've seen them take
// as long as an hour.
// 4. Namecheap requires you to whitelist the IP address from which you call
// its APIs. It also requires all API calls to include the whitelisted IP
// address as a form or query string value. This code uses a namecheap
// service to query the client's IP address.
var (
debug = false
defaultBaseURL = "https://api.namecheap.com/xml.response"
getIPURL = "https://dynamicdns.park-your-domain.com/getip"
httpClient = http.Client{Timeout: 60 * time.Second}
)
// DNSProvider is an implementation of the ChallengeProviderTimeout interface
// that uses Namecheap's tool API to manage TXT records for a domain.
type DNSProvider struct {
baseURL string
apiUser string
apiKey string
clientIP string
}
// NewDNSProvider returns a DNSProvider instance configured for namecheap.
// Credentials must be passed in the environment variables: NAMECHEAP_API_USER
// and NAMECHEAP_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
apiUser := os.Getenv("NAMECHEAP_API_USER")
apiKey := os.Getenv("NAMECHEAP_API_KEY")
return NewDNSProviderCredentials(apiUser, apiKey)
}
// NewDNSProviderCredentials uses the supplied credentials to return a
// DNSProvider instance configured for namecheap.
func NewDNSProviderCredentials(apiUser, apiKey string) (*DNSProvider, error) {
if apiUser == "" || apiKey == "" {
return nil, fmt.Errorf("Namecheap credentials missing")
}
clientIP, err := getClientIP()
if err != nil {
return nil, err
}
return &DNSProvider{
baseURL: defaultBaseURL,
apiUser: apiUser,
apiKey: apiKey,
clientIP: clientIP,
}, nil
}
// Timeout returns the timeout and interval to use when checking for DNS
// propagation. Namecheap can sometimes take a long time to complete an
// update, so wait up to 60 minutes for the update to propagate.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return 60 * time.Minute, 15 * time.Second
}
// host describes a DNS record returned by the Namecheap DNS gethosts API.
// Namecheap uses the term "host" to refer to all DNS records that include
// a host field (A, AAAA, CNAME, NS, TXT, URL).
type host struct {
Type string `xml:",attr"`
Name string `xml:",attr"`
Address string `xml:",attr"`
MXPref string `xml:",attr"`
TTL string `xml:",attr"`
}
// apierror describes an error record in a namecheap API response.
type apierror struct {
Number int `xml:",attr"`
Description string `xml:",innerxml"`
}
// getClientIP returns the client's public IP address. It uses namecheap's
// IP discovery service to perform the lookup.
func getClientIP() (addr string, err error) {
resp, err := httpClient.Get(getIPURL)
if err != nil {
return "", err
}
defer resp.Body.Close()
clientIP, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
if debug {
fmt.Println("Client IP:", string(clientIP))
}
return string(clientIP), nil
}
// A challenge repesents all the data needed to specify a dns-01 challenge
// to lets-encrypt.
type challenge struct {
domain string
key string
keyFqdn string
keyValue string
tld string
sld string
host string
}
// newChallenge builds a challenge record from a domain name, a challenge
// authentication key, and a map of available TLDs.
func newChallenge(domain, keyAuth string, tlds map[string]string) (*challenge, error) {
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domain = acme.UnFqdn(domain)
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parts := strings.Split(domain, ".")
// Find the longest matching TLD.
longest := -1
for i := len(parts); i > 0; i-- {
t := strings.Join(parts[i-1:], ".")
if _, found := tlds[t]; found {
longest = i - 1
}
}
if longest < 1 {
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return nil, fmt.Errorf("invalid domain name %q", domain)
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}
tld := strings.Join(parts[longest:], ".")
sld := parts[longest-1]
var host string
if longest >= 1 {
host = strings.Join(parts[:longest-1], ".")
}
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key, keyValue, _ := acme.DNS01Record(domain, keyAuth)
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return &challenge{
domain: domain,
key: "_acme-challenge." + host,
keyFqdn: key,
keyValue: keyValue,
tld: tld,
sld: sld,
host: host,
}, nil
}
// setGlobalParams adds the namecheap global parameters to the provided url
// Values record.
func (d *DNSProvider) setGlobalParams(v *url.Values, cmd string) {
v.Set("ApiUser", d.apiUser)
v.Set("ApiKey", d.apiKey)
v.Set("UserName", d.apiUser)
v.Set("ClientIp", d.clientIP)
v.Set("Command", cmd)
}
// getTLDs requests the list of available TLDs from namecheap.
func (d *DNSProvider) getTLDs() (tlds map[string]string, err error) {
values := make(url.Values)
d.setGlobalParams(&values, "namecheap.domains.getTldList")
reqURL, _ := url.Parse(d.baseURL)
reqURL.RawQuery = values.Encode()
resp, err := httpClient.Get(reqURL.String())
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("getHosts HTTP error %d", resp.StatusCode)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
type GetTldsResponse struct {
XMLName xml.Name `xml:"ApiResponse"`
Errors []apierror `xml:"Errors>Error"`
Result []struct {
Name string `xml:",attr"`
} `xml:"CommandResponse>Tlds>Tld"`
}
var gtr GetTldsResponse
if err := xml.Unmarshal(body, &gtr); err != nil {
return nil, err
}
if len(gtr.Errors) > 0 {
return nil, fmt.Errorf("Namecheap error: %s [%d]",
gtr.Errors[0].Description, gtr.Errors[0].Number)
}
tlds = make(map[string]string)
for _, t := range gtr.Result {
tlds[t.Name] = t.Name
}
return tlds, nil
}
// getHosts reads the full list of DNS host records using the Namecheap API.
func (d *DNSProvider) getHosts(ch *challenge) (hosts []host, err error) {
values := make(url.Values)
d.setGlobalParams(&values, "namecheap.domains.dns.getHosts")
values.Set("SLD", ch.sld)
values.Set("TLD", ch.tld)
reqURL, _ := url.Parse(d.baseURL)
reqURL.RawQuery = values.Encode()
resp, err := httpClient.Get(reqURL.String())
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("getHosts HTTP error %d", resp.StatusCode)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
type GetHostsResponse struct {
XMLName xml.Name `xml:"ApiResponse"`
Status string `xml:"Status,attr"`
Errors []apierror `xml:"Errors>Error"`
Hosts []host `xml:"CommandResponse>DomainDNSGetHostsResult>host"`
}
var ghr GetHostsResponse
if err = xml.Unmarshal(body, &ghr); err != nil {
return nil, err
}
if len(ghr.Errors) > 0 {
return nil, fmt.Errorf("Namecheap error: %s [%d]",
ghr.Errors[0].Description, ghr.Errors[0].Number)
}
return ghr.Hosts, nil
}
// setHosts writes the full list of DNS host records using the Namecheap API.
func (d *DNSProvider) setHosts(ch *challenge, hosts []host) error {
values := make(url.Values)
d.setGlobalParams(&values, "namecheap.domains.dns.setHosts")
values.Set("SLD", ch.sld)
values.Set("TLD", ch.tld)
for i, h := range hosts {
ind := fmt.Sprintf("%d", i+1)
values.Add("HostName"+ind, h.Name)
values.Add("RecordType"+ind, h.Type)
values.Add("Address"+ind, h.Address)
values.Add("MXPref"+ind, h.MXPref)
values.Add("TTL"+ind, h.TTL)
}
resp, err := httpClient.PostForm(d.baseURL, values)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return fmt.Errorf("setHosts HTTP error %d", resp.StatusCode)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
type SetHostsResponse struct {
XMLName xml.Name `xml:"ApiResponse"`
Status string `xml:"Status,attr"`
Errors []apierror `xml:"Errors>Error"`
Result struct {
IsSuccess string `xml:",attr"`
} `xml:"CommandResponse>DomainDNSSetHostsResult"`
}
var shr SetHostsResponse
if err := xml.Unmarshal(body, &shr); err != nil {
return err
}
if len(shr.Errors) > 0 {
return fmt.Errorf("Namecheap error: %s [%d]",
shr.Errors[0].Description, shr.Errors[0].Number)
}
if shr.Result.IsSuccess != "true" {
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return fmt.Errorf("Namecheap setHosts failed")
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}
return nil
}
// addChallengeRecord adds a DNS challenge TXT record to a list of namecheap
// host records.
func (d *DNSProvider) addChallengeRecord(ch *challenge, hosts *[]host) {
host := host{
Name: ch.key,
Type: "TXT",
Address: ch.keyValue,
MXPref: "10",
TTL: "120",
}
// If there's already a TXT record with the same name, replace it.
for i, h := range *hosts {
if h.Name == ch.key && h.Type == "TXT" {
(*hosts)[i] = host
return
}
}
// No record was replaced, so add a new one.
*hosts = append(*hosts, host)
}
// removeChallengeRecord removes a DNS challenge TXT record from a list of
// namecheap host records. Return true if a record was removed.
func (d *DNSProvider) removeChallengeRecord(ch *challenge, hosts *[]host) bool {
// Find the challenge TXT record and remove it if found.
for i, h := range *hosts {
if h.Name == ch.key && h.Type == "TXT" {
*hosts = append((*hosts)[:i], (*hosts)[i+1:]...)
return true
}
}
return false
}
// Present installs a TXT record for the DNS challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
tlds, err := d.getTLDs()
if err != nil {
return err
}
ch, err := newChallenge(domain, keyAuth, tlds)
if err != nil {
return err
}
hosts, err := d.getHosts(ch)
if err != nil {
return err
}
d.addChallengeRecord(ch, &hosts)
if debug {
for _, h := range hosts {
fmt.Printf(
"%-5.5s %-30.30s %-6s %-70.70s\n",
h.Type, h.Name, h.TTL, h.Address)
}
}
return d.setHosts(ch, hosts)
}
// CleanUp removes a TXT record used for a previous DNS challenge.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
tlds, err := d.getTLDs()
if err != nil {
return err
}
ch, err := newChallenge(domain, keyAuth, tlds)
if err != nil {
return err
}
hosts, err := d.getHosts(ch)
if err != nil {
return err
}
if removed := d.removeChallengeRecord(ch, &hosts); !removed {
return nil
}
return d.setHosts(ch, hosts)
}