lego/providers/dns/sakuracloud/sakuracloud.go
2018-06-21 21:24:45 +02:00

144 lines
4 KiB
Go

// Package sakuracloud implements a DNS provider for solving the DNS-01 challenge
// using sakuracloud DNS.
package sakuracloud
import (
"errors"
"fmt"
"net/http"
"strings"
"github.com/sacloud/libsacloud/api"
"github.com/sacloud/libsacloud/sacloud"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/platform/config/env"
)
// DNSProvider is an implementation of the acme.ChallengeProvider interface.
type DNSProvider struct {
client *api.Client
}
// 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("SAKURACLOUD_ACCESS_TOKEN", "SAKURACLOUD_ACCESS_TOKEN_SECRET")
if err != nil {
return nil, fmt.Errorf("SakuraCloud: %v", err)
}
return NewDNSProviderCredentials(values["SAKURACLOUD_ACCESS_TOKEN"], values["SAKURACLOUD_ACCESS_TOKEN_SECRET"])
}
// NewDNSProviderCredentials uses the supplied credentials to return a
// DNSProvider instance configured for sakuracloud.
func NewDNSProviderCredentials(token, secret string) (*DNSProvider, error) {
if token == "" {
return nil, errors.New("SakuraCloud AccessToken is missing")
}
if secret == "" {
return nil, errors.New("SakuraCloud AccessSecret is missing")
}
client := api.NewClient(token, secret, "tk1a")
client.UserAgent = acme.UserAgent
return &DNSProvider{client: client}, nil
}
// Present creates a TXT record to fulfil the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
zone, err := d.getHostedZone(domain)
if err != nil {
return err
}
name := d.extractRecordName(fqdn, zone.Name)
zone.AddRecord(zone.CreateNewRecord(name, "TXT", value, ttl))
_, err = d.client.GetDNSAPI().Update(zone.ID, zone)
if err != nil {
return fmt.Errorf("SakuraCloud API call failed: %v", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
zone, err := d.getHostedZone(domain)
if err != nil {
return err
}
records, err := d.findTxtRecords(fqdn, zone)
if err != nil {
return err
}
for _, record := range records {
var updRecords []sacloud.DNSRecordSet
for _, r := range zone.Settings.DNS.ResourceRecordSets {
if !(r.Name == record.Name && r.Type == record.Type && r.RData == record.RData) {
updRecords = append(updRecords, r)
}
}
zone.Settings.DNS.ResourceRecordSets = updRecords
}
_, err = d.client.GetDNSAPI().Update(zone.ID, zone)
if err != nil {
return fmt.Errorf("SakuraCloud API call failed: %v", err)
}
return nil
}
func (d *DNSProvider) getHostedZone(domain string) (*sacloud.DNS, error) {
authZone, err := acme.FindZoneByFqdn(acme.ToFqdn(domain), acme.RecursiveNameservers)
if err != nil {
return nil, err
}
zoneName := acme.UnFqdn(authZone)
res, err := d.client.GetDNSAPI().WithNameLike(zoneName).Find()
if err != nil {
if notFound, ok := err.(api.Error); ok && notFound.ResponseCode() == http.StatusNotFound {
return nil, fmt.Errorf("zone %s not found on SakuraCloud DNS: %v", zoneName, err)
}
return nil, fmt.Errorf("SakuraCloud API call failed: %v", err)
}
for _, zone := range res.CommonServiceDNSItems {
if zone.Name == zoneName {
return &zone, nil
}
}
return nil, fmt.Errorf("zone %s not found on SakuraCloud DNS", zoneName)
}
func (d *DNSProvider) findTxtRecords(fqdn string, zone *sacloud.DNS) ([]sacloud.DNSRecordSet, error) {
recordName := d.extractRecordName(fqdn, zone.Name)
var res []sacloud.DNSRecordSet
for _, record := range zone.Settings.DNS.ResourceRecordSets {
if record.Name == recordName && record.Type == "TXT" {
res = append(res, record)
}
}
return res, nil
}
func (d *DNSProvider) extractRecordName(fqdn, domain string) string {
name := acme.UnFqdn(fqdn)
if idx := strings.Index(name, "."+domain); idx != -1 {
return name[:idx]
}
return name
}