lego/providers/dns/vultr/vultr.go
2019-07-17 21:01:50 +02:00

178 lines
4.9 KiB
Go

// Package vultr implements a DNS provider for solving the DNS-01 challenge using the Vultr DNS.
// See https://www.vultr.com/api/#dns
package vultr
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net/http"
"strconv"
"strings"
"time"
"github.com/go-acme/lego/challenge/dns01"
"github.com/go-acme/lego/platform/config/env"
"github.com/vultr/govultr"
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
APIKey string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("VULTR_TTL", dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond("VULTR_PROPAGATION_TIMEOUT", dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("VULTR_POLLING_INTERVAL", dns01.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("VULTR_HTTP_TIMEOUT", 0),
// from Vultr Client
Transport: &http.Transport{
TLSNextProto: make(map[string]func(string, *tls.Conn) http.RoundTripper),
},
},
}
}
// DNSProvider is an implementation of the acme.ChallengeProvider interface.
type DNSProvider struct {
config *Config
client *govultr.Client
}
// NewDNSProvider returns a DNSProvider instance with a configured Vultr client.
// Authentication uses the VULTR_API_KEY environment variable.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("VULTR_API_KEY")
if err != nil {
return nil, fmt.Errorf("vultr: %v", err)
}
config := NewDefaultConfig()
config.APIKey = values["VULTR_API_KEY"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Vultr.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("vultr: the configuration of the DNS provider is nil")
}
if config.APIKey == "" {
return nil, fmt.Errorf("vultr: credentials missing")
}
client := govultr.NewClient(config.HTTPClient, config.APIKey)
return &DNSProvider{client: client, config: config}, nil
}
// Present creates a TXT record to fulfill the DNS-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zoneDomain, err := d.getHostedZone(domain)
if err != nil {
return fmt.Errorf("vultr: %v", err)
}
name := d.extractRecordName(fqdn, zoneDomain)
err = d.client.DNSRecord.Create(context.Background(), zoneDomain, name, "TXT", value, d.config.TTL, 0)
if err != nil {
return fmt.Errorf("vultr: 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, _ := dns01.GetRecord(domain, keyAuth)
zoneDomain, records, err := d.findTxtRecords(domain, fqdn)
if err != nil {
return fmt.Errorf("vultr: %v", err)
}
var allErr []string
for _, rec := range records {
err := d.client.DNSRecord.Delete(context.Background(), zoneDomain, strconv.Itoa(rec.RecordID))
if err != nil {
allErr = append(allErr, err.Error())
}
}
if len(allErr) > 0 {
return errors.New(strings.Join(allErr, ": "))
}
return nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}
func (d *DNSProvider) getHostedZone(domain string) (string, error) {
domains, err := d.client.DNSDomain.List(context.Background())
if err != nil {
return "", fmt.Errorf("API call failed: %v", err)
}
var hostedDomain govultr.DNSDomain
for _, dom := range domains {
if strings.HasSuffix(domain, dom.Domain) {
if len(dom.Domain) > len(hostedDomain.Domain) {
hostedDomain = dom
}
}
}
if hostedDomain.Domain == "" {
return "", fmt.Errorf("no matching Vultr domain found for domain %s", domain)
}
return hostedDomain.Domain, nil
}
func (d *DNSProvider) findTxtRecords(domain, fqdn string) (string, []govultr.DNSRecord, error) {
zoneDomain, err := d.getHostedZone(domain)
if err != nil {
return "", nil, err
}
var records []govultr.DNSRecord
result, err := d.client.DNSRecord.List(context.Background(), zoneDomain)
if err != nil {
return "", records, fmt.Errorf("API call has failed: %v", err)
}
recordName := d.extractRecordName(fqdn, zoneDomain)
for _, record := range result {
if record.Type == "TXT" && record.Name == recordName {
records = append(records, record)
}
}
return zoneDomain, records, nil
}
func (d *DNSProvider) extractRecordName(fqdn, domain string) string {
name := dns01.UnFqdn(fqdn)
if idx := strings.Index(name, "."+domain); idx != -1 {
return name[:idx]
}
return name
}