lego/providers/dns/cloudflare/client.go

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package cloudflare
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"github.com/xenolf/lego/acme"
)
// defaultBaseURL represents the API endpoint to call.
const defaultBaseURL = "https://api.cloudflare.com/client/v4"
// 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"`
}
// TxtRecord represents a Cloudflare DNS record
type TxtRecord 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"`
}
// HostedZone represents a Cloudflare DNS zone
type HostedZone struct {
ID string `json:"id"`
Name string `json:"name"`
}
// Client Cloudflare API client
type Client struct {
authEmail string
authKey string
BaseURL string
HTTPClient *http.Client
}
// NewClient create a Cloudflare API client
func NewClient(authEmail string, authKey string) (*Client, error) {
if authEmail == "" {
return nil, errors.New("cloudflare: some credentials information are missing: email")
}
if authKey == "" {
return nil, errors.New("cloudflare: some credentials information are missing: key")
}
return &Client{
authEmail: authEmail,
authKey: authKey,
BaseURL: defaultBaseURL,
HTTPClient: http.DefaultClient,
}, nil
}
// GetHostedZoneID get hosted zone
func (c *Client) GetHostedZoneID(fqdn string) (string, error) {
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return "", err
}
result, err := c.doRequest(http.MethodGet, "/zones?name="+acme.UnFqdn(authZone), nil)
if err != nil {
return "", err
}
var hostedZone []HostedZone
err = json.Unmarshal(result, &hostedZone)
if err != nil {
return "", fmt.Errorf("cloudflare: HostedZone unmarshaling error: %v", err)
}
count := len(hostedZone)
if count == 0 {
return "", fmt.Errorf("cloudflare: zone %s not found for domain %s", authZone, fqdn)
} else if count > 1 {
return "", fmt.Errorf("cloudflare: zone %s cannot be find for domain %s: too many hostedZone: %v", authZone, fqdn, hostedZone)
}
return hostedZone[0].ID, nil
}
// FindTxtRecord Find a TXT record
func (c *Client) FindTxtRecord(zoneID, fqdn string) (*TxtRecord, error) {
result, err := c.doRequest(
http.MethodGet,
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 []TxtRecord
err = json.Unmarshal(result, &records)
if err != nil {
return nil, fmt.Errorf("cloudflare: record unmarshaling error: %v", err)
}
for _, rec := range records {
fmt.Println(rec.Name, acme.UnFqdn(fqdn))
if rec.Name == acme.UnFqdn(fqdn) {
return &rec, nil
}
}
return nil, fmt.Errorf("cloudflare: no existing record found for %s", fqdn)
}
// AddTxtRecord add a TXT record
func (c *Client) AddTxtRecord(fqdn string, record TxtRecord) error {
zoneID, err := c.GetHostedZoneID(fqdn)
if err != nil {
return err
}
body, err := json.Marshal(record)
if err != nil {
return fmt.Errorf("cloudflare: record marshaling error: %v", err)
}
_, err = c.doRequest(http.MethodPost, fmt.Sprintf("/zones/%s/dns_records", zoneID), bytes.NewReader(body))
return err
}
// RemoveTxtRecord Remove a TXT record
func (c *Client) RemoveTxtRecord(fqdn string) error {
zoneID, err := c.GetHostedZoneID(fqdn)
if err != nil {
return err
}
record, err := c.FindTxtRecord(zoneID, fqdn)
if err != nil {
return err
}
_, err = c.doRequest(http.MethodDelete, fmt.Sprintf("/zones/%s/dns_records/%s", record.ZoneID, record.ID), nil)
return err
}
func (c *Client) doRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
req, err := http.NewRequest(method, fmt.Sprintf("%s%s", c.BaseURL, uri), body)
if err != nil {
return nil, err
}
req.Header.Set("X-Auth-Email", c.authEmail)
req.Header.Set("X-Auth-Key", c.authKey)
resp, err := c.HTTPClient.Do(req)
if err != nil {
return nil, fmt.Errorf("cloudflare: error querying API: %v", err)
}
defer resp.Body.Close()
content, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("cloudflare: %s", toUnreadableBodyMessage(req, content))
}
var r APIResponse
err = json.Unmarshal(content, &r)
if err != nil {
return nil, fmt.Errorf("cloudflare: APIResponse unmarshaling error: %v: %s", err, toUnreadableBodyMessage(req, content))
}
if !r.Success {
if len(r.Errors) > 0 {
return nil, fmt.Errorf("cloudflare: error \n%s", toError(r))
}
return nil, fmt.Errorf("cloudflare: %s", toUnreadableBodyMessage(req, content))
}
return r.Result, nil
}
func toUnreadableBodyMessage(req *http.Request, rawBody []byte) string {
return fmt.Sprintf("the request %s sent a response with a body which is an invalid format: %q", req.URL, string(rawBody))
}
func toError(r APIResponse) error {
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 fmt.Errorf("cloudflare: error \n%s", errStr)
}