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// Package tencentcloud implements a DNS provider for solving the DNS-01 challenge using Tencent Cloud DNS.
package tencentcloud
import (
"errors"
"fmt"
"math"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
"github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common"
"github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/profile"
dnspod "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/dnspod/v20210323"
)
// Environment variables names.
const (
envNamespace = "TENCENTCLOUD_"
EnvSecretID = envNamespace + "SECRET_ID"
EnvSecretKey = envNamespace + "SECRET_KEY"
EnvRegion = envNamespace + "REGION"
EnvSessionToken = envNamespace + "SESSION_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 {
SecretID string
SecretKey string
Region string
SessionToken string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPTimeout time.Duration
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, 600),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
HTTPTimeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *dnspod.Client
}
// NewDNSProvider returns a DNSProvider instance configured for Tencent Cloud DNS.
// Credentials must be passed in the environment variable: TENCENTCLOUD_SECRET_ID, TENCENTCLOUD_SECRET_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvSecretID, EnvSecretKey)
if err != nil {
return nil, fmt.Errorf("tencentcloud: %w", err)
}
config := NewDefaultConfig()
config.SecretID = values[EnvSecretID]
config.SecretKey = values[EnvSecretKey]
config.Region = env.GetOrDefaultString(EnvRegion, "")
config.SessionToken = env.GetOrDefaultString(EnvSessionToken, "")
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Tencent Cloud DNS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("tencentcloud: the configuration of the DNS provider is nil")
}
var credential *common.Credential
switch {
case config.SecretID != "" && config.SecretKey != "" && config.SessionToken != "":
credential = common.NewTokenCredential(config.SecretID, config.SecretKey, config.SessionToken)
case config.SecretID != "" && config.SecretKey != "":
credential = common.NewCredential(config.SecretID, config.SecretKey)
default:
return nil, errors.New("tencentcloud: credentials missing")
}
cpf := profile.NewClientProfile()
cpf.HttpProfile.Endpoint = "dnspod.tencentcloudapi.com"
cpf.HttpProfile.ReqTimeout = int(math.Round(config.HTTPTimeout.Seconds()))
client, err := dnspod.NewClient(credential, config.Region, cpf)
if err != nil {
return nil, fmt.Errorf("tencentcloud: %w", err)
}
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 {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zone, err := d.getHostedZone(fqdn)
if err != nil {
return fmt.Errorf("tencentcloud: failed to get hosted zone: %w", err)
}
recordName, err := extractRecordName(fqdn, *zone.Name)
if err != nil {
return fmt.Errorf("tencentcloud: failed to extract record name: %w", err)
}
request := dnspod.NewCreateRecordRequest()
request.Domain = zone.Name
request.DomainId = zone.DomainId
request.SubDomain = common.StringPtr(recordName)
request.RecordType = common.StringPtr("TXT")
request.RecordLine = common.StringPtr("默认")
request.Value = common.StringPtr(value)
request.TTL = common.Uint64Ptr(uint64(d.config.TTL))
_, err = d.client.CreateRecord(request)
if err != nil {
return fmt.Errorf("dnspod: API call failed: %w", err)
}
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)
zone, err := d.getHostedZone(fqdn)
if err != nil {
return fmt.Errorf("tencentcloud: failed to get hosted zone: %w", err)
}
records, err := d.findTxtRecords(zone, fqdn)
if err != nil {
return fmt.Errorf("tencentcloud: failed to find TXT records: %w", err)
}
for _, record := range records {
request := dnspod.NewDeleteRecordRequest()
request.Domain = zone.Name
request.DomainId = zone.DomainId
request.RecordId = record.RecordId
_, err := d.client.DeleteRecord(request)
if err != nil {
return fmt.Errorf("tencentcloud: delete record failed: %w", err)
}
}
return nil
}
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