lego/providers/dns/pdns/pdns.go

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// Package pdns implements a DNS provider for solving the DNS-01 challenge using PowerDNS nameserver.
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package pdns
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import (
"bytes"
"encoding/json"
"errors"
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"fmt"
"net/http"
"net/url"
"time"
"github.com/go-acme/lego/v3/challenge/dns01"
"github.com/go-acme/lego/v3/log"
"github.com/go-acme/lego/v3/platform/config/env"
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)
// Config is used to configure the creation of the DNSProvider
type Config struct {
APIKey string
Host *url.URL
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("PDNS_TTL", dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond("PDNS_PROPAGATION_TIMEOUT", 120*time.Second),
PollingInterval: env.GetOrDefaultSecond("PDNS_POLLING_INTERVAL", 2*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("PDNS_HTTP_TIMEOUT", 30*time.Second),
},
}
}
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// DNSProvider is an implementation of the acme.ChallengeProvider interface
type DNSProvider struct {
apiVersion int
config *Config
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}
// NewDNSProvider returns a DNSProvider instance configured for pdns.
// Credentials must be passed in the environment variable:
// PDNS_API_URL and PDNS_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("PDNS_API_KEY", "PDNS_API_URL")
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if err != nil {
return nil, fmt.Errorf("pdns: %v", err)
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}
hostURL, err := url.Parse(values["PDNS_API_URL"])
if err != nil {
return nil, fmt.Errorf("pdns: %v", err)
}
config := NewDefaultConfig()
config.Host = hostURL
config.APIKey = values["PDNS_API_KEY"]
return NewDNSProviderConfig(config)
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}
// NewDNSProviderConfig return a DNSProvider instance configured for pdns.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("pdns: the configuration of the DNS provider is nil")
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}
if config.APIKey == "" {
return nil, fmt.Errorf("pdns: API key missing")
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}
if config.Host == nil || config.Host.Host == "" {
return nil, fmt.Errorf("pdns: API URL missing")
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}
d := &DNSProvider{config: config}
apiVersion, err := d.getAPIVersion()
if err != nil {
log.Warnf("pdns: failed to get API version %v", err)
}
d.apiVersion = apiVersion
return d, nil
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}
// Timeout returns the timeout and interval to use when checking for DNS
// propagation. Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
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}
// Present creates a TXT record to fulfill the dns-01 challenge
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zone, err := d.getHostedZone(fqdn)
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if err != nil {
return fmt.Errorf("pdns: %v", err)
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}
name := fqdn
// pre-v1 API wants non-fqdn
if d.apiVersion == 0 {
name = dns01.UnFqdn(fqdn)
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}
rec := Record{
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Content: "\"" + value + "\"",
Disabled: false,
// pre-v1 API
Type: "TXT",
Name: name,
TTL: d.config.TTL,
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}
// Look for existing records.
existingRrSet, err := d.findTxtRecord(fqdn)
if err != nil {
return fmt.Errorf("pdns: %v", err)
}
// merge the existing and new records
var records []Record
if existingRrSet != nil {
records = existingRrSet.Records
}
records = append(records, rec)
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rrsets := rrSets{
RRSets: []rrSet{
{
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Name: name,
ChangeType: "REPLACE",
Type: "TXT",
Kind: "Master",
TTL: d.config.TTL,
Records: records,
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},
},
}
body, err := json.Marshal(rrsets)
if err != nil {
return fmt.Errorf("pdns: %v", err)
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}
_, err = d.sendRequest(http.MethodPatch, zone.URL, bytes.NewReader(body))
if err != nil {
return fmt.Errorf("pdns: %v", err)
}
return nil
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}
// CleanUp removes the TXT record matching the specified parameters
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
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zone, err := d.getHostedZone(fqdn)
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if err != nil {
return fmt.Errorf("pdns: %v", err)
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}
set, err := d.findTxtRecord(fqdn)
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if err != nil {
return fmt.Errorf("pdns: %v", err)
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}
if set == nil {
return fmt.Errorf("pdns: no existing record found for %s", fqdn)
}
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rrsets := rrSets{
RRSets: []rrSet{
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{
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Name: set.Name,
Type: set.Type,
ChangeType: "DELETE",
},
},
}
body, err := json.Marshal(rrsets)
if err != nil {
return fmt.Errorf("pdns: %v", err)
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}
_, err = d.sendRequest(http.MethodPatch, zone.URL, bytes.NewReader(body))
if err != nil {
return fmt.Errorf("pdns: %v", err)
}
return nil
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}