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