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lego/providers/dns/selectel/selectel.go

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// Package selectel implements a DNS provider for solving the DNS-01 challenge using Selectel Domains API.
// Selectel Domain API reference: https://kb.selectel.com/23136054.html
// Token: https://my.selectel.ru/profile/apikeys
package selectel
import (
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"context"
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"errors"
"fmt"
"net/http"
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"net/url"
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"time"
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"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
"github.com/go-acme/lego/v4/providers/dns/internal/selectel"
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)
const minTTL = 60
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// Environment variables names.
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const (
envNamespace = "SELECTEL_"
EnvBaseURL = envNamespace + "BASE_URL"
EnvAPIToken = envNamespace + "API_TOKEN"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
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)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
BaseURL string
Token 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{
BaseURL: env.GetOrDefaultString(EnvBaseURL, selectel.DefaultSelectelBaseURL),
TTL: env.GetOrDefaultInt(EnvTTL, minTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 120*time.Second),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 2*time.Second),
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HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
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},
}
}
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// DNSProvider implements the challenge.Provider interface.
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type DNSProvider struct {
config *Config
client *selectel.Client
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}
// NewDNSProvider returns a DNSProvider instance configured for Selectel Domains API.
// API token must be passed in the environment variable SELECTEL_API_TOKEN.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIToken)
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if err != nil {
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return nil, fmt.Errorf("selectel: %w", err)
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}
config := NewDefaultConfig()
config.Token = values[EnvAPIToken]
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return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for selectel.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("selectel: the configuration of the DNS provider is nil")
}
if config.Token == "" {
return nil, errors.New("selectel: credentials missing")
}
if config.TTL < minTTL {
return nil, fmt.Errorf("selectel: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
}
client := selectel.NewClient(config.Token)
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if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
var err error
client.BaseURL, err = url.Parse(config.BaseURL)
if err != nil {
return nil, fmt.Errorf("selectel: %w", err)
}
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return &DNSProvider{config: config, client: client}, 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 to fulfill DNS-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
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ctx := context.Background()
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// TODO(ldez) replace domain by FQDN to follow CNAME.
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domainObj, err := d.client.GetDomainByName(ctx, domain)
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if err != nil {
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return fmt.Errorf("selectel: %w", err)
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}
txtRecord := selectel.Record{
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Type: "TXT",
TTL: d.config.TTL,
Name: info.EffectiveFQDN,
Content: info.Value,
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}
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_, err = d.client.AddRecord(ctx, domainObj.ID, txtRecord)
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if err != nil {
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return fmt.Errorf("selectel: %w", err)
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}
return nil
}
// CleanUp removes a TXT record used for DNS-01 challenge.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
recordName := dns01.UnFqdn(info.EffectiveFQDN)
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ctx := context.Background()
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// TODO(ldez) replace domain by FQDN to follow CNAME.
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domainObj, err := d.client.GetDomainByName(ctx, domain)
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if err != nil {
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return fmt.Errorf("selectel: %w", err)
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}
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records, err := d.client.ListRecords(ctx, domainObj.ID)
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if err != nil {
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return fmt.Errorf("selectel: %w", err)
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}
// Delete records with specific FQDN
var lastErr error
for _, record := range records {
if record.Name == recordName {
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err = d.client.DeleteRecord(ctx, domainObj.ID, record.ID)
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if err != nil {
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lastErr = fmt.Errorf("selectel: %w", err)
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}
}
}
return lastErr
}