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luadns.go
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luadns.go
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// Package luadns implements a DNS provider for solving the DNS-01 challenge using LuaDNS.
package luadns
import (
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/simonmittag/lego/v4/challenge/dns01"
"github.com/simonmittag/lego/v4/platform/config/env"
"github.com/simonmittag/lego/v4/providers/dns/luadns/internal"
)
const minTTL = 300
// Environment variables names.
const (
envNamespace = "LUADNS_"
EnvAPIUsername = envNamespace + "API_USERNAME"
EnvAPIToken = envNamespace + "API_TOKEN"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
APIUsername string
APIToken string
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(EnvTTL, minTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 120*time.Second),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 2*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *internal.Client
recordsMu sync.Mutex
records map[string]*internal.DNSRecord
}
// NewDNSProvider returns a DNSProvider instance configured for LuaDNS.
// Credentials must be passed in the environment variables:
// LUADNS_API_USERNAME and LUADNS_API_TOKEN.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIUsername, EnvAPIToken)
if err != nil {
return nil, fmt.Errorf("luadns: %w", err)
}
config := NewDefaultConfig()
config.APIUsername = values[EnvAPIUsername]
config.APIToken = values[EnvAPIToken]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for LuaDNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("luadns: the configuration of the DNS provider is nil")
}
if config.APIUsername == "" || config.APIToken == "" {
return nil, errors.New("luadns: credentials missing")
}
if config.TTL < minTTL {
return nil, fmt.Errorf("luadns: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
}
client := internal.NewClient(config.APIUsername, config.APIToken)
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{
config: config,
client: client,
recordsMu: sync.Mutex{},
records: make(map[string]*internal.DNSRecord),
}, 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
}
// Present creates a TXT record using the specified parameters.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zones, err := d.client.ListZones()
if err != nil {
return fmt.Errorf("luadns: failed to get zones: %w", err)
}
zone := findZone(zones, domain)
if zone == nil {
return fmt.Errorf("luadns: no matching zone found for domain %s", domain)
}
newRecord := internal.DNSRecord{
Name: fqdn,
Type: "TXT",
Content: value,
TTL: d.config.TTL,
}
record, err := d.client.CreateRecord(*zone, newRecord)
if err != nil {
return fmt.Errorf("luadns: failed to create record: %w", err)
}
d.recordsMu.Lock()
d.records[token] = record
d.recordsMu.Unlock()
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
d.recordsMu.Lock()
record, ok := d.records[token]
d.recordsMu.Unlock()
if !ok {
return fmt.Errorf("luadns: unknown record ID for '%s'", fqdn)
}
err := d.client.DeleteRecord(record)
if err != nil {
return fmt.Errorf("luadns: failed to delete record: %w", err)
}
// Delete record from map
d.recordsMu.Lock()
delete(d.records, token)
d.recordsMu.Unlock()
return nil
}
func findZone(zones []internal.DNSZone, domain string) *internal.DNSZone {
var result *internal.DNSZone
for _, zone := range zones {
zone := zone
if zone.Name != "" && strings.HasSuffix(domain, zone.Name) {
if result == nil || len(zone.Name) > len(result.Name) {
result = &zone
}
}
}
return result
}