lego/providers/dns/pdns/client.go
2020-03-20 22:53:09 +01:00

220 lines
4.4 KiB
Go

package pdns
import (
"encoding/json"
"fmt"
"io"
"net/http"
"strconv"
"strings"
"github.com/go-acme/lego/v3/challenge/dns01"
)
type Record struct {
Content string `json:"content"`
Disabled bool `json:"disabled"`
// pre-v1 API
Name string `json:"name"`
Type string `json:"type"`
TTL int `json:"ttl,omitempty"`
}
type hostedZone struct {
ID string `json:"id"`
Name string `json:"name"`
URL string `json:"url"`
RRSets []rrSet `json:"rrsets"`
// pre-v1 API
Records []Record `json:"records"`
}
type rrSet struct {
Name string `json:"name"`
Type string `json:"type"`
Kind string `json:"kind"`
ChangeType string `json:"changetype"`
Records []Record `json:"records"`
TTL int `json:"ttl,omitempty"`
}
type rrSets struct {
RRSets []rrSet `json:"rrsets"`
}
type apiError struct {
ShortMsg string `json:"error"`
}
func (a apiError) Error() string {
return a.ShortMsg
}
type apiVersion struct {
URL string `json:"url"`
Version int `json:"version"`
}
func (d *DNSProvider) getHostedZone(fqdn string) (*hostedZone, error) {
var zone hostedZone
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return nil, err
}
u := "/servers/localhost/zones"
result, err := d.sendRequest(http.MethodGet, u, nil)
if err != nil {
return nil, err
}
var zones []hostedZone
err = json.Unmarshal(result, &zones)
if err != nil {
return nil, err
}
u = ""
for _, zone := range zones {
if dns01.UnFqdn(zone.Name) == dns01.UnFqdn(authZone) {
u = zone.URL
break
}
}
result, err = d.sendRequest(http.MethodGet, u, nil)
if err != nil {
return nil, err
}
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 (d *DNSProvider) findTxtRecord(fqdn string) (*rrSet, error) {
zone, err := d.getHostedZone(fqdn)
if err != nil {
return nil, err
}
_, err = d.sendRequest(http.MethodGet, zone.URL, nil)
if err != nil {
return nil, err
}
for _, set := range zone.RRSets {
if (set.Name == dns01.UnFqdn(fqdn) || set.Name == fqdn) && set.Type == "TXT" {
return &set, nil
}
}
return nil, nil
}
func (d *DNSProvider) getAPIVersion() (int, error) {
result, err := d.sendRequest(http.MethodGet, "/api", nil)
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 (d *DNSProvider) sendRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
req, err := d.makeRequest(method, uri, body)
if err != nil {
return nil, err
}
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return nil, fmt.Errorf("error talking to PDNS API: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusUnprocessableEntity && (resp.StatusCode < 200 || resp.StatusCode >= 300) {
return nil, fmt.Errorf("unexpected HTTP status code %d when fetching '%s'", resp.StatusCode, req.URL)
}
var msg json.RawMessage
err = json.NewDecoder(resp.Body).Decode(&msg)
if err != nil {
if 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, err
}
if errInfo.ShortMsg != "" {
return nil, fmt.Errorf("error talking to PDNS API: %w", errInfo)
}
}
return msg, nil
}
func (d *DNSProvider) makeRequest(method, uri string, body io.Reader) (*http.Request, error) {
var path = ""
if d.config.Host.Path != "/" {
path = d.config.Host.Path
}
if !strings.HasPrefix(uri, "/") {
uri = "/" + uri
}
if d.apiVersion > 0 && !strings.HasPrefix(uri, "/api/v") {
uri = "/api/v" + strconv.Itoa(d.apiVersion) + uri
}
u := d.config.Host.Scheme + "://" + d.config.Host.Host + path + uri
req, err := http.NewRequest(method, u, body)
if err != nil {
return nil, err
}
req.Header.Set("X-API-Key", d.config.APIKey)
return req, nil
}