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lego/providers/dns/selfhostde/selfhostde.go
2024-11-15 23:21:21 +01:00

187 lines
5.1 KiB
Go

// Package selfhostde implements a DNS provider for solving the DNS-01 challenge using SelfHost.(de|eu).
package selfhostde
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/go-acme/lego/v4/challenge"
"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/selfhostde/internal"
)
// Environment variables.
const (
envNamespace = "SELFHOSTDE_"
EnvUsername = envNamespace + "USERNAME"
EnvPassword = envNamespace + "PASSWORD"
EnvRecordsMapping = envNamespace + "RECORDS_MAPPING"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
var _ challenge.ProviderTimeout = (*DNSProvider)(nil)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
Username string
Password string
RecordsMapping map[string]*Seq
recordsMappingMu sync.Mutex
TTL int
PropagationTimeout time.Duration
PollingInterval time.Duration
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 4*time.Minute),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 30*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
},
}
}
func (c *Config) getSeqNext(domain string) (string, error) {
effectiveDomain := strings.TrimPrefix(domain, "_acme-challenge.")
c.recordsMappingMu.Lock()
defer c.recordsMappingMu.Unlock()
seq, ok := c.RecordsMapping[effectiveDomain]
if !ok {
// fallback
seq, ok = c.RecordsMapping[domain]
if !ok {
return "", fmt.Errorf("record mapping not found for %q", effectiveDomain)
}
}
return seq.Next(), nil
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *internal.Client
recordIDs map[string]string
recordIDsMu sync.Mutex
}
// NewDNSProvider returns a DNSProvider instance configured for SelfHost.(de|eu).
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvUsername, EnvPassword, EnvRecordsMapping)
if err != nil {
return nil, fmt.Errorf("selfhostde: %w", err)
}
config := NewDefaultConfig()
config.Username = values[EnvUsername]
config.Password = values[EnvPassword]
mapping, err := parseRecordsMapping(values[EnvRecordsMapping])
if err != nil {
return nil, fmt.Errorf("selfhostde: malformed records mapping: %w", err)
}
config.RecordsMapping = mapping
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for SelfHost.(de|eu).
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("selfhostde: supplied configuration is nil")
}
if config.Username == "" || config.Password == "" {
return nil, errors.New("selfhostde: credentials missing")
}
if len(config.RecordsMapping) == 0 {
return nil, errors.New("selfhostde: missing record mapping")
}
for domain, seq := range config.RecordsMapping {
if seq == nil || len(seq.ids) == 0 {
return nil, fmt.Errorf("selfhostde: missing record ID for %q", domain)
}
}
client := internal.NewClient(config.Username, config.Password)
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{
config: config,
client: client,
recordIDs: make(map[string]string),
}, 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 the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
recordID, err := d.config.getSeqNext(dns01.UnFqdn(info.EffectiveFQDN))
if err != nil {
return fmt.Errorf("selfhostde: %w", err)
}
err = d.client.UpdateTXTRecord(context.Background(), recordID, info.Value)
if err != nil {
return fmt.Errorf("selfhostde: update DNS TXT record (id=%s): %w", recordID, err)
}
d.recordIDsMu.Lock()
d.recordIDs[token] = recordID
d.recordIDsMu.Unlock()
return nil
}
// CleanUp removes the TXT record previously created.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
d.recordIDsMu.Lock()
recordID, ok := d.recordIDs[token]
d.recordIDsMu.Unlock()
if !ok {
return fmt.Errorf("selfhostde: unknown record ID for %q", dns01.UnFqdn(info.EffectiveFQDN))
}
err := d.client.UpdateTXTRecord(context.Background(), recordID, "empty")
if err != nil {
return fmt.Errorf("selfhostde: emptied DNS TXT record (id=%s): %w", recordID, err)
}
return nil
}