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client.go
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client.go
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package internal
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
)
type Client struct {
token string
baseURL *url.URL
HTTPClient *http.Client
}
func NewClient(endpoint string, token string) (*Client, error) {
baseURL, err := url.Parse(endpoint)
if err != nil {
return nil, err
}
return &Client{
token: token,
baseURL: baseURL,
HTTPClient: &http.Client{Timeout: 5 * time.Second},
}, nil
}
// AddRecord Adds one record to a specified domain.
// https://docs.rackspace.com/docs/cloud-dns/v1/api-reference/records#add-records
func (c *Client) AddRecord(ctx context.Context, zoneID string, record Record) error {
endpoint := c.baseURL.JoinPath("domains", zoneID, "records")
records := Records{Records: []Record{record}}
req, err := newJSONRequest(ctx, http.MethodPost, endpoint, records)
if err != nil {
return err
}
err = c.do(req, nil)
if err != nil {
return err
}
return nil
}
// DeleteRecord Deletes a record from the domain.
// https://docs.rackspace.com/docs/cloud-dns/v1/api-reference/records#delete-records
func (c *Client) DeleteRecord(ctx context.Context, zoneID, recordID string) error {
endpoint := c.baseURL.JoinPath("domains", zoneID, "records")
query := endpoint.Query()
query.Set("id", recordID)
endpoint.RawQuery = query.Encode()
req, err := newJSONRequest(ctx, http.MethodDelete, endpoint, nil)
if err != nil {
return err
}
err = c.do(req, nil)
if err != nil {
return err
}
return nil
}
// GetHostedZoneID performs a lookup to get the DNS zone which needs modifying for a given FQDN.
func (c *Client) GetHostedZoneID(ctx context.Context, fqdn string) (string, error) {
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return "", fmt.Errorf("could not find zone for FQDN %q: %w", fqdn, err)
}
zoneSearchResponse, err := c.listDomainsByName(ctx, dns01.UnFqdn(authZone))
if err != nil {
return "", err
}
// If nothing was returned, or for whatever reason more than 1 was returned (the search uses exact match, so should not occur)
if zoneSearchResponse.TotalEntries != 1 {
return "", fmt.Errorf("found %d zones for %s in Rackspace for domain %s", zoneSearchResponse.TotalEntries, authZone, fqdn)
}
return zoneSearchResponse.HostedZones[0].ID, nil
}
// listDomainsByName Filters domains by domain name.
// https://docs.rackspace.com/docs/cloud-dns/v1/api-reference/domains#list-domains-by-name
func (c *Client) listDomainsByName(ctx context.Context, domain string) (*ZoneSearchResponse, error) {
endpoint := c.baseURL.JoinPath("domains")
query := endpoint.Query()
query.Set("name", domain)
endpoint.RawQuery = query.Encode()
req, err := newJSONRequest(ctx, http.MethodGet, endpoint, nil)
if err != nil {
return nil, err
}
var zoneSearchResponse ZoneSearchResponse
err = c.do(req, &zoneSearchResponse)
if err != nil {
return nil, err
}
return &zoneSearchResponse, nil
}
// FindTxtRecord searches a DNS zone for a TXT record with a specific name.
func (c *Client) FindTxtRecord(ctx context.Context, fqdn string, zoneID string) (*Record, error) {
records, err := c.searchRecords(ctx, zoneID, dns01.UnFqdn(fqdn), "TXT")
if err != nil {
return nil, err
}
switch len(records.Records) {
case 1:
case 0:
return nil, fmt.Errorf("no TXT record found for %s", fqdn)
default:
return nil, fmt.Errorf("more than 1 TXT record found for %s", fqdn)
}
return &records.Records[0], nil
}
// https://docs.rackspace.com/docs/cloud-dns/v1/api-reference/records#search-records
func (c *Client) searchRecords(ctx context.Context, zoneID, recordName, recordType string) (*Records, error) {
endpoint := c.baseURL.JoinPath("domains", zoneID, "records")
query := endpoint.Query()
query.Set("type", recordType)
query.Set("name", recordName)
endpoint.RawQuery = query.Encode()
req, err := newJSONRequest(ctx, http.MethodGet, endpoint, nil)
if err != nil {
return nil, err
}
var records Records
err = c.do(req, &records)
if err != nil {
return nil, err
}
return &records, nil
}
func (c *Client) do(req *http.Request, result any) error {
req.Header.Set("X-Auth-Token", c.token)
resp, err := c.HTTPClient.Do(req)
if err != nil {
return errutils.NewHTTPDoError(req, err)
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusAccepted {
return errutils.NewUnexpectedResponseStatusCodeError(req, resp)
}
if result == nil {
return nil
}
raw, err := io.ReadAll(resp.Body)
if err != nil {
return errutils.NewReadResponseError(req, resp.StatusCode, err)
}
err = json.Unmarshal(raw, result)
if err != nil {
return errutils.NewUnmarshalError(req, resp.StatusCode, raw, err)
}
return nil
}
func newJSONRequest[T string | *url.URL](ctx context.Context, method string, endpoint T, payload interface{}) (*http.Request, error) {
buf := new(bytes.Buffer)
if payload != nil {
err := json.NewEncoder(buf).Encode(payload)
if err != nil {
return nil, fmt.Errorf("failed to create request JSON body: %w", err)
}
}
req, err := http.NewRequestWithContext(ctx, method, fmt.Sprintf("%s", endpoint), buf)
if err != nil {
return nil, fmt.Errorf("unable to create request: %w", err)
}
req.Header.Set("Accept", "application/json")
if payload != nil {
req.Header.Set("Content-Type", "application/json")
}
return req, nil
}