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sakuracloud.go
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sakuracloud.go
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// Package sakuracloud implements a DNS provider for solving the DNS-01 challenge using SakuraCloud DNS.
package sakuracloud
import (
"errors"
"fmt"
"net/http"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
client "github.com/sacloud/api-client-go"
"github.com/sacloud/iaas-api-go"
"github.com/sacloud/iaas-api-go/helper/api"
)
// Environment variables names.
const (
envNamespace = "SAKURACLOUD_"
EnvAccessToken = envNamespace + "ACCESS_TOKEN"
EnvAccessTokenSecret = envNamespace + "ACCESS_TOKEN_SECRET"
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 {
Token string
Secret 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, dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 10*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client iaas.DNSAPI
}
// NewDNSProvider returns a DNSProvider instance configured for SakuraCloud.
// Credentials must be passed in the environment variables:
// SAKURACLOUD_ACCESS_TOKEN & SAKURACLOUD_ACCESS_TOKEN_SECRET.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAccessToken, EnvAccessTokenSecret)
if err != nil {
return nil, fmt.Errorf("sakuracloud: %w", err)
}
config := NewDefaultConfig()
config.Token = values[EnvAccessToken]
config.Secret = values[EnvAccessTokenSecret]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for SakuraCloud.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("sakuracloud: the configuration of the DNS provider is nil")
}
if config.Token == "" {
return nil, errors.New("sakuracloud: AccessToken is missing")
}
if config.Secret == "" {
return nil, errors.New("sakuracloud: AccessSecret is missing")
}
defaultOption, err := api.DefaultOption()
if err != nil {
return nil, fmt.Errorf("sakuracloud: %w", err)
}
options := &api.CallerOptions{
Options: &client.Options{
AccessToken: config.Token,
AccessTokenSecret: config.Secret,
HttpClient: config.HTTPClient,
UserAgent: fmt.Sprintf("go-acme/lego %s", iaas.DefaultUserAgent),
},
}
return &DNSProvider{
client: iaas.NewDNSOp(api.NewCallerWithOptions(api.MergeOptions(defaultOption, options))),
config: config,
}, nil
}
// 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)
err := d.addTXTRecord(info.EffectiveFQDN, info.Value, d.config.TTL)
if err != nil {
return fmt.Errorf("sakuracloud: %w", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
err := d.cleanupTXTRecord(info.EffectiveFQDN, info.Value)
if err != nil {
return fmt.Errorf("sakuracloud: %w", err)
}
return 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
}