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auroradns.go
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auroradns.go
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// Package auroradns implements a DNS provider for solving the DNS-01 challenge using Aurora DNS.
package auroradns
import (
"errors"
"fmt"
"sync"
"time"
"github.com/go-acme/lego/challenge/dns01"
"github.com/go-acme/lego/platform/config/env"
"github.com/nrdcg/auroradns"
)
const defaultBaseURL = "https://api.auroradns.eu"
// Config is used to configure the creation of the DNSProvider
type Config struct {
BaseURL string
UserID string
Key string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("AURORA_TTL", 300),
PropagationTimeout: env.GetOrDefaultSecond("AURORA_PROPAGATION_TIMEOUT", dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("AURORA_POLLING_INTERVAL", dns01.DefaultPollingInterval),
}
}
// DNSProvider describes a provider for AuroraDNS
type DNSProvider struct {
recordIDs map[string]string
recordIDsMu sync.Mutex
config *Config
client *auroradns.Client
}
// NewDNSProvider returns a DNSProvider instance configured for AuroraDNS.
// Credentials must be passed in the environment variables:
// AURORA_USER_ID and AURORA_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("AURORA_USER_ID", "AURORA_KEY")
if err != nil {
return nil, fmt.Errorf("aurora: %v", err)
}
config := NewDefaultConfig()
config.BaseURL = env.GetOrFile("AURORA_ENDPOINT")
config.UserID = values["AURORA_USER_ID"]
config.Key = values["AURORA_KEY"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for AuroraDNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("aurora: the configuration of the DNS provider is nil")
}
if config.UserID == "" || config.Key == "" {
return nil, errors.New("aurora: some credentials information are missing")
}
if config.BaseURL == "" {
config.BaseURL = defaultBaseURL
}
tr, err := auroradns.NewTokenTransport(config.UserID, config.Key)
if err != nil {
return nil, fmt.Errorf("aurora: %v", err)
}
client, err := auroradns.NewClient(tr.Client(), auroradns.WithBaseURL(config.BaseURL))
if err != nil {
return nil, fmt.Errorf("aurora: %v", err)
}
return &DNSProvider{
config: config,
client: client,
recordIDs: make(map[string]string),
}, nil
}
// Present creates a record with a secret
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(dns01.ToFqdn(domain))
if err != nil {
return fmt.Errorf("aurora: could not determine zone for domain: '%s'. %s", domain, err)
}
// 1. Aurora will happily create the TXT record when it is provided a fqdn,
// but it will only appear in the control panel and will not be
// propagated to DNS servers. Extract and use subdomain instead.
// 2. A trailing dot in the fqdn will cause Aurora to add a trailing dot to
// the subdomain, resulting in _acme-challenge..<domain> rather
// than _acme-challenge.<domain>
subdomain := fqdn[0 : len(fqdn)-len(authZone)-1]
authZone = dns01.UnFqdn(authZone)
zone, err := d.getZoneInformationByName(authZone)
if err != nil {
return fmt.Errorf("aurora: could not create record: %v", err)
}
record := auroradns.Record{
RecordType: "TXT",
Name: subdomain,
Content: value,
TTL: d.config.TTL,
}
newRecord, _, err := d.client.CreateRecord(zone.ID, record)
if err != nil {
return fmt.Errorf("aurora: could not create record: %v", err)
}
d.recordIDsMu.Lock()
d.recordIDs[fqdn] = newRecord.ID
d.recordIDsMu.Unlock()
return nil
}
// CleanUp removes a given record that was generated by Present
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
d.recordIDsMu.Lock()
recordID, ok := d.recordIDs[fqdn]
d.recordIDsMu.Unlock()
if !ok {
return fmt.Errorf("unknown recordID for %q", fqdn)
}
authZone, err := dns01.FindZoneByFqdn(dns01.ToFqdn(domain))
if err != nil {
return fmt.Errorf("could not determine zone for domain: %q. %v", domain, err)
}
authZone = dns01.UnFqdn(authZone)
zone, err := d.getZoneInformationByName(authZone)
if err != nil {
return err
}
_, _, err = d.client.DeleteRecord(zone.ID, recordID)
if err != nil {
return err
}
d.recordIDsMu.Lock()
delete(d.recordIDs, fqdn)
d.recordIDsMu.Unlock()
return nil
}
// 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
}
func (d *DNSProvider) getZoneInformationByName(name string) (auroradns.Zone, error) {
zs, _, err := d.client.ListZones()
if err != nil {
return auroradns.Zone{}, err
}
for _, element := range zs {
if element.Name == name {
return element, nil
}
}
return auroradns.Zone{}, fmt.Errorf("could not find Zone record")
}