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// Package cloudflare implements a DNS provider for solving the DNS-01
// challenge using cloudflare DNS.
package cloudflare
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"os"
"time"
"github.com/xenolf/lego/acme"
)
// CloudFlareAPIURL represents the API endpoint to call.
// TODO: Unexport?
const CloudFlareAPIURL = "https://api.cloudflare.com/client/v4"
// DNSProvider is an implementation of the acme.ChallengeProvider interface
type DNSProvider struct {
authEmail string
authKey string
}
// NewDNSProvider returns a DNSProvider instance configured for cloudflare.
// Credentials must be passed in the environment variables: CLOUDFLARE_EMAIL
// and CLOUDFLARE_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
email := os.Getenv("CLOUDFLARE_EMAIL")
key := os.Getenv("CLOUDFLARE_API_KEY")
return NewDNSProviderCredentials(email, key)
}
// NewDNSProviderCredentials uses the supplied credentials to return a
// DNSProvider instance configured for cloudflare.
func NewDNSProviderCredentials(email, key string) (*DNSProvider, error) {
if email == "" || key == "" {
return nil, fmt.Errorf("CloudFlare credentials missing")
}
return &DNSProvider{
authEmail: email,
authKey: key,
}, nil
}
// Timeout returns the timeout and interval to use when checking for DNS
// propagation. Adjusting here to cope with spikes in propagation times.
func (c *DNSProvider) Timeout() (timeout, interval time.Duration) {
return 120 * time.Second, 2 * time.Second
}
// Present creates a TXT record to fulfil the dns-01 challenge
func (c *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
zoneID, err := c.getHostedZoneID(fqdn)
if err != nil {
return err
}
rec := cloudFlareRecord{
Type: "TXT",
Name: acme.UnFqdn(fqdn),
Content: value,
TTL: 120,
}
body, err := json.Marshal(rec)
if err != nil {
return err
}
_, err = c.makeRequest("POST", fmt.Sprintf("/zones/%s/dns_records", zoneID), bytes.NewReader(body))
if err != nil {
return err
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters
func (c *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
record, err := c.findTxtRecord(fqdn)
if err != nil {
return err
}
_, err = c.makeRequest("DELETE", fmt.Sprintf("/zones/%s/dns_records/%s", record.ZoneID, record.ID), nil)
if err != nil {
return err
}
return nil
}
func (c *DNSProvider) getHostedZoneID(fqdn string) (string, error) {
// HostedZone represents a CloudFlare DNS zone
type HostedZone struct {
ID string `json:"id"`
Name string `json:"name"`
}
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return "", err
}
result, err := c.makeRequest("GET", "/zones?name="+acme.UnFqdn(authZone), nil)
if err != nil {
return "", err
}
var hostedZone []HostedZone
err = json.Unmarshal(result, &hostedZone)
if err != nil {
return "", err
}
if len(hostedZone) != 1 {
return "", fmt.Errorf("Zone %s not found in CloudFlare for domain %s", authZone, fqdn)
}
return hostedZone[0].ID, nil
}
func (c *DNSProvider) findTxtRecord(fqdn string) (*cloudFlareRecord, error) {
zoneID, err := c.getHostedZoneID(fqdn)
if err != nil {
return nil, err
}
result, err := c.makeRequest(
"GET",
fmt.Sprintf("/zones/%s/dns_records?per_page=1000&type=TXT&name=%s", zoneID, acme.UnFqdn(fqdn)),
nil,
)
if err != nil {
return nil, err
}
var records []cloudFlareRecord
err = json.Unmarshal(result, &records)
if err != nil {
return nil, err
}
for _, rec := range records {
if rec.Name == acme.UnFqdn(fqdn) {
return &rec, nil
}
}
return nil, fmt.Errorf("No existing record found for %s", fqdn)
}
func (c *DNSProvider) makeRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
// APIError contains error details for failed requests
type APIError struct {
Code int `json:"code,omitempty"`
Message string `json:"message,omitempty"`
ErrorChain []APIError `json:"error_chain,omitempty"`
}
// APIResponse represents a response from CloudFlare API
type APIResponse struct {
Success bool `json:"success"`
Errors []*APIError `json:"errors"`
Result json.RawMessage `json:"result"`
}
req, err := http.NewRequest(method, fmt.Sprintf("%s%s", CloudFlareAPIURL, uri), body)
if err != nil {
return nil, err
}
req.Header.Set("X-Auth-Email", c.authEmail)
req.Header.Set("X-Auth-Key", c.authKey)
//req.Header.Set("User-Agent", userAgent())
client := http.Client{Timeout: 30 * time.Second}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("Error querying Cloudflare API -> %v", err)
}
defer resp.Body.Close()
var r APIResponse
err = json.NewDecoder(resp.Body).Decode(&r)
if err != nil {
return nil, err
}
if !r.Success {
if len(r.Errors) > 0 {
errStr := ""
for _, apiErr := range r.Errors {
errStr += fmt.Sprintf("\t Error: %d: %s", apiErr.Code, apiErr.Message)
for _, chainErr := range apiErr.ErrorChain {
errStr += fmt.Sprintf("<- %d: %s", chainErr.Code, chainErr.Message)
}
}
return nil, fmt.Errorf("Cloudflare API Error \n%s", errStr)
}
return nil, fmt.Errorf("Cloudflare API error")
}
return r.Result, nil
}
// cloudFlareRecord represents a CloudFlare DNS record
type cloudFlareRecord struct {
Name string `json:"name"`
Type string `json:"type"`
Content string `json:"content"`
ID string `json:"id,omitempty"`
TTL int `json:"ttl,omitempty"`
ZoneID string `json:"zone_id,omitempty"`
}
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