traefik/vendor/github.com/go-acme/lego/providers/dns/dnsimple/dnsimple.go
2019-03-14 11:04:04 +01:00

211 lines
5.6 KiB
Go

// Package dnsimple implements a DNS provider for solving the DNS-01 challenge using dnsimple DNS.
package dnsimple
import (
"context"
"errors"
"fmt"
"strconv"
"strings"
"time"
"github.com/dnsimple/dnsimple-go/dnsimple"
"github.com/go-acme/lego/challenge/dns01"
"github.com/go-acme/lego/platform/config/env"
"golang.org/x/oauth2"
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
AccessToken string
BaseURL string
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
}
// NewDefaultConfig returns a default configuration for the DNSProvider
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt("DNSIMPLE_TTL", dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond("DNSIMPLE_PROPAGATION_TIMEOUT", dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond("DNSIMPLE_POLLING_INTERVAL", dns01.DefaultPollingInterval),
}
}
// DNSProvider is an implementation of the acme.ChallengeProvider interface.
type DNSProvider struct {
config *Config
client *dnsimple.Client
}
// NewDNSProvider returns a DNSProvider instance configured for dnsimple.
// Credentials must be passed in the environment variables: DNSIMPLE_OAUTH_TOKEN.
//
// See: https://developer.dnsimple.com/v2/#authentication
func NewDNSProvider() (*DNSProvider, error) {
config := NewDefaultConfig()
config.AccessToken = env.GetOrFile("DNSIMPLE_OAUTH_TOKEN")
config.BaseURL = env.GetOrFile("DNSIMPLE_BASE_URL")
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for DNSimple.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("dnsimple: the configuration of the DNS provider is nil")
}
if config.AccessToken == "" {
return nil, fmt.Errorf("dnsimple: OAuth token is missing")
}
ts := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: config.AccessToken})
client := dnsimple.NewClient(oauth2.NewClient(context.Background(), ts))
if config.BaseURL != "" {
client.BaseURL = config.BaseURL
}
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)
zoneName, err := d.getHostedZone(domain)
if err != nil {
return fmt.Errorf("dnsimple: %v", err)
}
accountID, err := d.getAccountID()
if err != nil {
return fmt.Errorf("dnsimple: %v", err)
}
recordAttributes := newTxtRecord(zoneName, fqdn, value, d.config.TTL)
_, err = d.client.Zones.CreateRecord(accountID, zoneName, recordAttributes)
if err != nil {
return fmt.Errorf("dnsimple: 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)
records, err := d.findTxtRecords(domain, fqdn)
if err != nil {
return fmt.Errorf("dnsimple: %v", err)
}
accountID, err := d.getAccountID()
if err != nil {
return fmt.Errorf("dnsimple: %v", err)
}
var lastErr error
for _, rec := range records {
_, err := d.client.Zones.DeleteRecord(accountID, rec.ZoneID, rec.ID)
if err != nil {
lastErr = fmt.Errorf("dnsimple: %v", err)
}
}
return lastErr
}
// 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) {
authZone, err := dns01.FindZoneByFqdn(dns01.ToFqdn(domain))
if err != nil {
return "", err
}
accountID, err := d.getAccountID()
if err != nil {
return "", err
}
zoneName := dns01.UnFqdn(authZone)
zones, err := d.client.Zones.ListZones(accountID, &dnsimple.ZoneListOptions{NameLike: zoneName})
if err != nil {
return "", fmt.Errorf("API call failed: %v", err)
}
var hostedZone dnsimple.Zone
for _, zone := range zones.Data {
if zone.Name == zoneName {
hostedZone = zone
}
}
if hostedZone.ID == 0 {
return "", fmt.Errorf("zone %s not found in DNSimple for domain %s", authZone, domain)
}
return hostedZone.Name, nil
}
func (d *DNSProvider) findTxtRecords(domain, fqdn string) ([]dnsimple.ZoneRecord, error) {
zoneName, err := d.getHostedZone(domain)
if err != nil {
return nil, err
}
accountID, err := d.getAccountID()
if err != nil {
return nil, err
}
recordName := extractRecordName(fqdn, zoneName)
result, err := d.client.Zones.ListRecords(accountID, zoneName, &dnsimple.ZoneRecordListOptions{Name: recordName, Type: "TXT", ListOptions: dnsimple.ListOptions{}})
if err != nil {
return nil, fmt.Errorf("API call has failed: %v", err)
}
return result.Data, nil
}
func newTxtRecord(zoneName, fqdn, value string, ttl int) dnsimple.ZoneRecord {
name := extractRecordName(fqdn, zoneName)
return dnsimple.ZoneRecord{
Type: "TXT",
Name: name,
Content: value,
TTL: ttl,
}
}
func extractRecordName(fqdn, domain string) string {
name := dns01.UnFqdn(fqdn)
if idx := strings.Index(name, "."+domain); idx != -1 {
return name[:idx]
}
return name
}
func (d *DNSProvider) getAccountID() (string, error) {
whoamiResponse, err := d.client.Identity.Whoami()
if err != nil {
return "", err
}
if whoamiResponse.Data.Account == nil {
return "", fmt.Errorf("user tokens are not supported, please use an account token")
}
return strconv.FormatInt(whoamiResponse.Data.Account.ID, 10), nil
}