94 lines
2.8 KiB
Go
94 lines
2.8 KiB
Go
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package acme
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import (
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"fmt"
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"github.com/mitchellh/goamz/aws"
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"github.com/mitchellh/goamz/route53"
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"math"
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"strings"
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)
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// DNSProviderRoute53 is an implementation of the DNSProvider interface
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type DNSProviderRoute53 struct {
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client *route53.Route53
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}
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// NewDNSProviderRoute53 returns a DNSProviderRoute53 instance with a configured route53 client.
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// Authentication is either done using the passed credentials or - when empty -
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// using the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.
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func NewDNSProviderRoute53(awsAccessKey, awsSecretKey, awsRegionName string) (*DNSProviderRoute53, error) {
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region, ok := aws.Regions[awsRegionName]
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if !ok {
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return nil, fmt.Errorf("Invalid AWS region name %s", awsRegionName)
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}
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var auth aws.Auth
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// First try passed in credentials
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if awsAccessKey != "" && awsSecretKey != "" {
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auth = aws.Auth{awsAccessKey, awsSecretKey, ""}
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} else {
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// try getting credentials from environment
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envAuth, err := aws.EnvAuth()
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if err != nil {
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return nil, fmt.Errorf("AWS credentials missing")
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}
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auth = envAuth
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}
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client := route53.New(auth, region)
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return &DNSProviderRoute53{client: client}, nil
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}
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// CreateTXTRecord creates a TXT record using the specified parameters
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func (r *DNSProviderRoute53) CreateTXTRecord(fqdn, value string, ttl int) error {
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return r.changeRecord("UPSERT", fqdn, value, ttl)
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}
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// RemoveTXTRecord removes the TXT record matching the specified parameters
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func (r *DNSProviderRoute53) RemoveTXTRecord(fqdn, value string, ttl int) error {
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return r.changeRecord("DELETE", fqdn, value, ttl)
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}
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func (r *DNSProviderRoute53) changeRecord(action, fqdn, value string, ttl int) error {
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hostedZoneID, err := r.getHostedZoneID(fqdn)
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if err != nil {
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return err
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}
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recordSet := newTXTRecordSet(fqdn, value, ttl)
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update := route53.Change{action, recordSet}
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changes := []route53.Change{update}
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req := route53.ChangeResourceRecordSetsRequest{Comment: "Created by Lego", Changes: changes}
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_, err = r.client.ChangeResourceRecordSets(hostedZoneID, &req)
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return err
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}
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func (r *DNSProviderRoute53) getHostedZoneID(fqdn string) (string, error) {
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zoneResp, err := r.client.ListHostedZones("", math.MaxInt64)
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if err != nil {
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return "", err
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}
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var hostedZone route53.HostedZone
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for _, zone := range zoneResp.HostedZones {
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//if strings.HasSuffix(domain, strings.Trim(zone.Name, ".")) {
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if strings.HasSuffix(fqdn, zone.Name) {
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if len(zone.Name) > len(hostedZone.Name) {
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hostedZone = zone
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}
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}
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}
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if hostedZone.ID == "" {
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return "", fmt.Errorf("No Route53 zone found for domain %s", fqdn)
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}
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return hostedZone.ID, nil
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}
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func newTXTRecordSet(fqdn, value string, ttl int) route53.ResourceRecordSet {
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return route53.ResourceRecordSet{
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Name: fqdn,
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Type: "TXT",
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Records: []string{value},
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TTL: ttl,
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}
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}
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