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// Package ns1 implements a DNS provider for solving the DNS-01 challenge
// using NS1 DNS.
package ns1
import (
"fmt"
"net/http"
"os"
"time"
"github.com/xenolf/lego/acme"
"gopkg.in/ns1/ns1-go.v2/rest"
"gopkg.in/ns1/ns1-go.v2/rest/model/dns"
)
// DNSProvider is an implementation of the acme.ChallengeProvider interface.
type DNSProvider struct {
client *rest.Client
}
// NewDNSProvider returns a DNSProvider instance configured for NS1.
// Credentials must be passed in the environment variables: NS1_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
key := os.Getenv("NS1_API_KEY")
if key == "" {
return nil, fmt.Errorf("NS1 credentials missing")
}
return NewDNSProviderCredentials(key)
}
// NewDNSProviderCredentials uses the supplied credentials to return a
// DNSProvider instance configured for NS1.
func NewDNSProviderCredentials(key string) (*DNSProvider, error) {
if key == "" {
return nil, fmt.Errorf("NS1 credentials missing")
}
httpClient := &http.Client{Timeout: time.Second * 10}
client := rest.NewClient(httpClient, rest.SetAPIKey(key))
return &DNSProvider{client}, nil
}
// Present creates a TXT record to fulfil the dns-01 challenge.
func (c *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value, ttl := acme.DNS01Record(domain, keyAuth)
zone, err := c.getHostedZone(domain)
if err != nil {
return err
}
record := c.newTxtRecord(zone, fqdn, value, ttl)
_, err = c.client.Records.Create(record)
if err != nil && err != rest.ErrRecordExists {
return err
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (c *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
zone, err := c.getHostedZone(domain)
if err != nil {
return err
}
name := acme.UnFqdn(fqdn)
_, err = c.client.Records.Delete(zone.Zone, name, "TXT")
return err
}
func (c *DNSProvider) getHostedZone(domain string) (*dns.Zone, error) {
zone, _, err := c.client.Zones.Get(domain)
if err != nil {
return nil, err
}
return zone, nil
}
func (c *DNSProvider) newTxtRecord(zone *dns.Zone, fqdn, value string, ttl int) *dns.Record {
name := acme.UnFqdn(fqdn)
return &dns.Record{
Type: "TXT",
Zone: zone.Zone,
Domain: name,
TTL: ttl,
Answers: []*dns.Answer{
{Rdata: []string{value}},
},
}
}
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