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servercow.go
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servercow.go
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// Package servercow implements a DNS provider for solving the DNS-01 challenge using Servercow DNS.
package servercow
import (
"context"
"errors"
"fmt"
"net/http"
"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/servercow/internal"
)
// Environment variables names.
const (
envNamespace = "SERVERCOW_"
EnvUsername = envNamespace + "USERNAME"
EnvPassword = envNamespace + "PASSWORD"
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 {
Username string
Password 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, 120),
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
}
// NewDNSProvider returns a DNSProvider instance.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvUsername, EnvPassword)
if err != nil {
return nil, fmt.Errorf("servercow: %w", err)
}
config := NewDefaultConfig()
config.Username = values[EnvUsername]
config.Password = values[EnvPassword]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Servercow.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config.Username == "" || config.Password == "" {
return nil, errors.New("servercow: incomplete credentials, missing username and/or password")
}
client := internal.NewClient(config.Username, config.Password)
if config.HTTPClient == nil {
client.HTTPClient = config.HTTPClient
}
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 the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := getAuthZone(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("servercow: %w", err)
}
ctx := context.Background()
records, err := d.client.GetRecords(ctx, authZone)
if err != nil {
return fmt.Errorf("servercow: %w", err)
}
recordName, err := dns01.ExtractSubDomain(info.EffectiveFQDN, authZone)
if err != nil {
return fmt.Errorf("servercow: %w", err)
}
record := findRecords(records, recordName)
// TXT record entry already existing
if record != nil {
if containsValue(record, info.Value) {
return nil
}
request := internal.Record{
Name: record.Name,
TTL: record.TTL,
Type: record.Type,
Content: append(record.Content, info.Value),
}
_, err = d.client.CreateUpdateRecord(ctx, authZone, request)
if err != nil {
return fmt.Errorf("servercow: failed to update TXT records: %w", err)
}
return nil
}
request := internal.Record{
Type: "TXT",
Name: recordName,
TTL: d.config.TTL,
Content: internal.Value{info.Value},
}
_, err = d.client.CreateUpdateRecord(ctx, authZone, request)
if err != nil {
return fmt.Errorf("servercow: failed to create TXT record %s: %w", info.EffectiveFQDN, err)
}
return nil
}
// CleanUp removes the TXT record previously created.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := getAuthZone(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("servercow: %w", err)
}
ctx := context.Background()
records, err := d.client.GetRecords(ctx, authZone)
if err != nil {
return fmt.Errorf("servercow: failed to get TXT records: %w", err)
}
recordName, err := dns01.ExtractSubDomain(info.EffectiveFQDN, authZone)
if err != nil {
return fmt.Errorf("servercow: %w", err)
}
record := findRecords(records, recordName)
if record == nil {
return nil
}
if !containsValue(record, info.Value) {
return nil
}
// only 1 record value, the whole record must be deleted.
if len(record.Content) == 1 {
_, err = d.client.DeleteRecord(ctx, authZone, *record)
if err != nil {
return fmt.Errorf("servercow: failed to delete TXT records: %w", err)
}
return nil
}
request := internal.Record{
Name: record.Name,
Type: record.Type,
TTL: record.TTL,
}
for _, val := range record.Content {
if val != info.Value {
request.Content = append(request.Content, val)
}
}
_, err = d.client.CreateUpdateRecord(ctx, authZone, request)
if err != nil {
return fmt.Errorf("servercow: failed to update TXT records: %w", err)
}
return nil
}
func getAuthZone(domain string) (string, error) {
authZone, err := dns01.FindZoneByFqdn(domain)
if err != nil {
return "", fmt.Errorf("could not find zone for FQDN %q: %w", domain, err)
}
zoneName := dns01.UnFqdn(authZone)
return zoneName, nil
}
func findRecords(records []internal.Record, name string) *internal.Record {
for _, r := range records {
if r.Type == "TXT" && r.Name == name {
return &r
}
}
return nil
}
func containsValue(record *internal.Record, value string) bool {
for _, val := range record.Content {
if val == value {
return true
}
}
return false
}