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// Package hosttech implements a DNS provider for solving the DNS-01 challenge using hosttech.
package hosttech
import (
"errors"
"fmt"
"net/http"
"strconv"
"strings"
"sync"
"time"
"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/hosttech/internal"
)
// Environment variables names.
const (
envNamespace = "HOSTTECH_"
EnvAPIKey = envNamespace + "API_KEY"
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 {
APIKey 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, 3600),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *internal.Client
recordIDs map[string]int
recordIDsMu sync.Mutex
}
// NewDNSProvider returns a DNSProvider instance configured for hosttech.
// Credentials must be passed in the environment variable: HOSTTECH_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIKey)
if err != nil {
return nil, fmt.Errorf("hosttech: %w", err)
}
config := NewDefaultConfig()
config.APIKey = values[EnvAPIKey]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for hosttech.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("hosttech: the configuration of the DNS provider is nil")
}
if config.APIKey == "" {
return nil, errors.New("hosttech: missing credentials")
}
client := internal.NewClient(config.APIKey)
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{
config: config,
client: client,
recordIDs: map[string]int{},
}, 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)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("hosttech: could not determine zone for domain %q: %w", domain, err)
}
zone, err := d.client.GetZone(dns01.UnFqdn(authZone))
if err != nil {
return fmt.Errorf("hosttech: could not find zone for domain %q (%s): %w", domain, authZone, err)
}
record := internal.Record{
Type: "TXT",
Name: dns01.UnFqdn(strings.TrimSuffix(fqdn, authZone)),
Text: value,
TTL: d.config.TTL,
}
newRecord, err := d.client.AddRecord(strconv.Itoa(zone.ID), record)
if err != nil {
return fmt.Errorf("hosttech: %w", err)
}
d.recordIDsMu.Lock()
d.recordIDs[token] = newRecord.ID
d.recordIDsMu.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)
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("hosttech: could not determine zone for domain %q: %w", domain, err)
}
zone, err := d.client.GetZone(dns01.UnFqdn(authZone))
if err != nil {
return fmt.Errorf("hosttech: could not find zone for domain %q (%s): %w", domain, authZone, err)
}
// gets the record's unique ID from when we created it
d.recordIDsMu.Lock()
recordID, ok := d.recordIDs[token]
d.recordIDsMu.Unlock()
if !ok {
return fmt.Errorf("hosttech: unknown record ID for '%s' '%s'", fqdn, token)
}
err = d.client.DeleteRecord(strconv.Itoa(zone.ID), strconv.Itoa(recordID))
if err != nil {
return fmt.Errorf("hosttech: %w", err)
}
return nil
}
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