/
client.go
227 lines (180 loc) · 4.67 KB
/
client.go
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package internal
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
"github.com/miekg/dns"
)
// Client the PowerDNS API client.
type Client struct {
serverName string
apiKey string
apiVersion int
Host *url.URL
HTTPClient *http.Client
}
// NewClient creates a new Client.
func NewClient(host *url.URL, serverName string, apiKey string) *Client {
return &Client{
serverName: serverName,
apiKey: apiKey,
Host: host,
HTTPClient: &http.Client{Timeout: 5 * time.Second},
}
}
func (c *Client) APIVersion() int {
return c.apiVersion
}
func (c *Client) SetAPIVersion(ctx context.Context) error {
var err error
c.apiVersion, err = c.getAPIVersion(ctx)
return err
}
func (c *Client) getAPIVersion(ctx context.Context) (int, error) {
endpoint := c.joinPath("/", "api")
req, err := newJSONRequest(ctx, http.MethodGet, endpoint, nil)
if err != nil {
return 0, err
}
result, err := c.do(req)
if err != nil {
return 0, err
}
var versions []apiVersion
err = json.Unmarshal(result, &versions)
if err != nil {
return 0, err
}
latestVersion := 0
for _, v := range versions {
if v.Version > latestVersion {
latestVersion = v.Version
}
}
return latestVersion, err
}
func (c *Client) GetHostedZone(ctx context.Context, authZone string) (*HostedZone, error) {
endpoint := c.joinPath("/", "servers", c.serverName, "zones", dns.Fqdn(authZone))
req, err := newJSONRequest(ctx, http.MethodGet, endpoint, nil)
if err != nil {
return nil, err
}
result, err := c.do(req)
if err != nil {
return nil, err
}
var zone HostedZone
err = json.Unmarshal(result, &zone)
if err != nil {
return nil, err
}
// convert pre-v1 API result
if len(zone.Records) > 0 {
zone.RRSets = []RRSet{}
for _, record := range zone.Records {
set := RRSet{
Name: record.Name,
Type: record.Type,
Records: []Record{record},
}
zone.RRSets = append(zone.RRSets, set)
}
}
return &zone, nil
}
func (c *Client) UpdateRecords(ctx context.Context, zone *HostedZone, sets RRSets) error {
endpoint := c.joinPath("/", zone.URL)
req, err := newJSONRequest(ctx, http.MethodPatch, endpoint, sets)
if err != nil {
return err
}
_, err = c.do(req)
if err != nil {
return err
}
return nil
}
func (c *Client) Notify(ctx context.Context, zone *HostedZone) error {
if c.apiVersion < 1 || zone.Kind != "Master" && zone.Kind != "Slave" {
return nil
}
endpoint := c.joinPath("/", zone.URL, "/notify")
req, err := newJSONRequest(ctx, http.MethodPut, endpoint, nil)
if err != nil {
return err
}
_, err = c.do(req)
if err != nil {
return err
}
return nil
}
func (c *Client) joinPath(elem ...string) *url.URL {
p := path.Join(elem...)
if p != "/api" && c.apiVersion > 0 && !strings.HasPrefix(p, "/api/v") {
p = path.Join("/api", "v"+strconv.Itoa(c.apiVersion), p)
}
return c.Host.JoinPath(p)
}
func (c *Client) do(req *http.Request) (json.RawMessage, error) {
req.Header.Set("X-API-Key", c.apiKey)
resp, err := c.HTTPClient.Do(req)
if err != nil {
return nil, errutils.NewHTTPDoError(req, err)
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != http.StatusUnprocessableEntity && (resp.StatusCode < 200 || resp.StatusCode >= 300) {
return nil, errutils.NewUnexpectedResponseStatusCodeError(req, resp)
}
var msg json.RawMessage
err = json.NewDecoder(resp.Body).Decode(&msg)
if err != nil {
if errors.Is(err, io.EOF) {
// empty body
return nil, nil
}
// other error
return nil, err
}
// check for PowerDNS error message
if len(msg) > 0 && msg[0] == '{' {
var errInfo apiError
err = json.Unmarshal(msg, &errInfo)
if err != nil {
return nil, errutils.NewUnmarshalError(req, resp.StatusCode, msg, err)
}
if errInfo.ShortMsg != "" {
return nil, fmt.Errorf("error talking to PDNS API: %w", errInfo)
}
}
return msg, nil
}
func newJSONRequest(ctx context.Context, method string, endpoint *url.URL, payload any) (*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, strings.TrimSuffix(endpoint.String(), "/"), buf)
if err != nil {
return nil, fmt.Errorf("unable to create request: %w", err)
}
req.Header.Set("Accept", "application/json")
// PowerDNS doesn't follow HTTP convention about the "Content-Type" header.
if method != http.MethodGet && method != http.MethodDelete {
req.Header.Set("Content-Type", "application/json")
}
return req, nil
}