traefik/vendor/github.com/xenolf/lego/providers/dns/alidns/alidns.go
Ludovic Fernandez 253060b4f3 Update Lego
2018-09-14 10:06:03 +02:00

166 lines
4.5 KiB
Go

// Package alidns implements a DNS provider for solving the DNS-01 challenge
// using Alibaba Cloud DNS.
package alidns
import (
"fmt"
"os"
"strings"
"github.com/aliyun/alibaba-cloud-sdk-go/sdk/requests"
"github.com/aliyun/alibaba-cloud-sdk-go/services/alidns"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/platform/config/env"
)
const defaultRegionID = "cn-hangzhou"
// DNSProvider is an implementation of the acme.ChallengeProvider interface
type DNSProvider struct {
client *alidns.Client
}
// NewDNSProvider returns a DNSProvider instance configured for Alibaba Cloud DNS.
// Credentials must be passed in the environment variables: ALICLOUD_ACCESS_KEY and ALICLOUD_SECRET_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("ALICLOUD_ACCESS_KEY", "ALICLOUD_SECRET_KEY")
if err != nil {
return nil, fmt.Errorf("AliDNS: %v", err)
}
regionID := os.Getenv("ALICLOUD_REGION_ID")
return NewDNSProviderCredentials(values["ALICLOUD_ACCESS_KEY"], values["ALICLOUD_SECRET_KEY"], regionID)
}
// NewDNSProviderCredentials uses the supplied credentials to return a DNSProvider instance configured for alidns.
func NewDNSProviderCredentials(apiKey, secretKey, regionID string) (*DNSProvider, error) {
if apiKey == "" || secretKey == "" {
return nil, fmt.Errorf("AliDNS: credentials missing")
}
if len(regionID) == 0 {
regionID = defaultRegionID
}
client, err := alidns.NewClientWithAccessKey(regionID, apiKey, secretKey)
if err != nil {
return nil, fmt.Errorf("AliDNS: credentials failed: %v", err)
}
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)
_, zoneName, err := d.getHostedZone(domain)
if err != nil {
return err
}
recordAttributes := d.newTxtRecord(zoneName, fqdn, value, ttl)
_, err = d.client.AddDomainRecord(recordAttributes)
if err != nil {
return fmt.Errorf("AliDNS: 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)
records, err := d.findTxtRecords(domain, fqdn)
if err != nil {
return err
}
_, _, err = d.getHostedZone(domain)
if err != nil {
return err
}
for _, rec := range records {
request := alidns.CreateDeleteDomainRecordRequest()
request.RecordId = rec.RecordId
_, err = d.client.DeleteDomainRecord(request)
if err != nil {
return err
}
}
return nil
}
func (d *DNSProvider) getHostedZone(domain string) (string, string, error) {
request := alidns.CreateDescribeDomainsRequest()
zones, err := d.client.DescribeDomains(request)
if err != nil {
return "", "", fmt.Errorf("AliDNS: API call failed: %v", err)
}
authZone, err := acme.FindZoneByFqdn(acme.ToFqdn(domain), acme.RecursiveNameservers)
if err != nil {
return "", "", err
}
var hostedZone alidns.Domain
for _, zone := range zones.Domains.Domain {
if zone.DomainName == acme.UnFqdn(authZone) {
hostedZone = zone
}
}
if hostedZone.DomainId == "" {
return "", "", fmt.Errorf("AliDNS: zone %s not found in AliDNS for domain %s", authZone, domain)
}
return fmt.Sprintf("%v", hostedZone.DomainId), hostedZone.DomainName, nil
}
func (d *DNSProvider) newTxtRecord(zone, fqdn, value string, ttl int) *alidns.AddDomainRecordRequest {
request := alidns.CreateAddDomainRecordRequest()
request.Type = "TXT"
request.DomainName = zone
request.RR = d.extractRecordName(fqdn, zone)
request.Value = value
request.TTL = requests.NewInteger(600)
return request
}
func (d *DNSProvider) findTxtRecords(domain, fqdn string) ([]alidns.Record, error) {
_, zoneName, err := d.getHostedZone(domain)
if err != nil {
return nil, err
}
request := alidns.CreateDescribeDomainRecordsRequest()
request.DomainName = zoneName
request.PageSize = requests.NewInteger(500)
var records []alidns.Record
result, err := d.client.DescribeDomainRecords(request)
if err != nil {
return records, fmt.Errorf("AliDNS: API call has failed: %v", err)
}
recordName := d.extractRecordName(fqdn, zoneName)
for _, record := range result.DomainRecords.Record {
if record.RR == recordName {
records = append(records, record)
}
}
return records, 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
}