2019-03-11 18:56:48 +02:00
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package pdns
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2018-12-06 23:50:17 +02:00
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"strconv"
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"strings"
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2019-07-30 21:19:32 +02:00
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"github.com/go-acme/lego/v3/challenge/dns01"
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2018-12-06 23:50:17 +02:00
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)
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type Record struct {
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Content string `json:"content"`
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Disabled bool `json:"disabled"`
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// pre-v1 API
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Name string `json:"name"`
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Type string `json:"type"`
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TTL int `json:"ttl,omitempty"`
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}
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type hostedZone struct {
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ID string `json:"id"`
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Name string `json:"name"`
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URL string `json:"url"`
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RRSets []rrSet `json:"rrsets"`
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// pre-v1 API
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Records []Record `json:"records"`
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}
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type rrSet struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Kind string `json:"kind"`
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ChangeType string `json:"changetype"`
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Records []Record `json:"records"`
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TTL int `json:"ttl,omitempty"`
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}
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type rrSets struct {
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RRSets []rrSet `json:"rrsets"`
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}
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type apiError struct {
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ShortMsg string `json:"error"`
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}
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func (a apiError) Error() string {
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return a.ShortMsg
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}
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type apiVersion struct {
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URL string `json:"url"`
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Version int `json:"version"`
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}
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func (d *DNSProvider) getHostedZone(fqdn string) (*hostedZone, error) {
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var zone hostedZone
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authZone, err := dns01.FindZoneByFqdn(fqdn)
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if err != nil {
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return nil, err
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}
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u := "/servers/localhost/zones"
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result, err := d.sendRequest(http.MethodGet, u, nil)
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if err != nil {
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return nil, err
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}
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var zones []hostedZone
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err = json.Unmarshal(result, &zones)
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if err != nil {
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return nil, err
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}
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u = ""
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for _, zone := range zones {
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if dns01.UnFqdn(zone.Name) == dns01.UnFqdn(authZone) {
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u = zone.URL
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break
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}
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}
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result, err = d.sendRequest(http.MethodGet, u, nil)
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if err != nil {
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return nil, err
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}
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err = json.Unmarshal(result, &zone)
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if err != nil {
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return nil, err
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}
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// convert pre-v1 API result
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if len(zone.Records) > 0 {
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zone.RRSets = []rrSet{}
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for _, record := range zone.Records {
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set := rrSet{
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Name: record.Name,
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Type: record.Type,
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Records: []Record{record},
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}
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zone.RRSets = append(zone.RRSets, set)
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}
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}
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return &zone, nil
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}
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func (d *DNSProvider) findTxtRecord(fqdn string) (*rrSet, error) {
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zone, err := d.getHostedZone(fqdn)
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if err != nil {
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return nil, err
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}
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_, err = d.sendRequest(http.MethodGet, zone.URL, nil)
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if err != nil {
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return nil, err
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}
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for _, set := range zone.RRSets {
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if (set.Name == dns01.UnFqdn(fqdn) || set.Name == fqdn) && set.Type == "TXT" {
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return &set, nil
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}
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}
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2019-03-21 16:46:21 +02:00
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return nil, nil
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2018-12-06 23:50:17 +02:00
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}
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func (d *DNSProvider) getAPIVersion() (int, error) {
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result, err := d.sendRequest(http.MethodGet, "/api", nil)
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if err != nil {
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return 0, err
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}
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var versions []apiVersion
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err = json.Unmarshal(result, &versions)
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if err != nil {
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return 0, err
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}
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latestVersion := 0
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for _, v := range versions {
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if v.Version > latestVersion {
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latestVersion = v.Version
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}
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}
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return latestVersion, err
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}
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func (d *DNSProvider) sendRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
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req, err := d.makeRequest(method, uri, body)
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if err != nil {
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return nil, err
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}
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resp, err := d.config.HTTPClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("error talking to PDNS API -> %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusUnprocessableEntity && (resp.StatusCode < 200 || resp.StatusCode >= 300) {
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return nil, fmt.Errorf("unexpected HTTP status code %d when fetching '%s'", resp.StatusCode, req.URL)
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}
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var msg json.RawMessage
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err = json.NewDecoder(resp.Body).Decode(&msg)
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if err != nil {
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if err == io.EOF {
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// empty body
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return nil, nil
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}
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// other error
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return nil, err
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}
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// check for PowerDNS error message
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if len(msg) > 0 && msg[0] == '{' {
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var errInfo apiError
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err = json.Unmarshal(msg, &errInfo)
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if err != nil {
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return nil, err
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}
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if errInfo.ShortMsg != "" {
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return nil, fmt.Errorf("error talking to PDNS API -> %v", errInfo)
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}
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}
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return msg, nil
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}
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func (d *DNSProvider) makeRequest(method, uri string, body io.Reader) (*http.Request, error) {
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var path = ""
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if d.config.Host.Path != "/" {
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path = d.config.Host.Path
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}
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if !strings.HasPrefix(uri, "/") {
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uri = "/" + uri
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}
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if d.apiVersion > 0 && !strings.HasPrefix(uri, "/api/v") {
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uri = "/api/v" + strconv.Itoa(d.apiVersion) + uri
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}
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u := d.config.Host.Scheme + "://" + d.config.Host.Host + path + uri
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req, err := http.NewRequest(method, u, body)
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if err != nil {
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return nil, err
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}
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req.Header.Set("X-API-Key", d.config.APIKey)
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return req, nil
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}
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