256 lines
7.1 KiB
Go
256 lines
7.1 KiB
Go
// Package gandiv5 implements a DNS provider for solving the DNS-01
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// challenge using Gandi LiveDNS api.
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package gandiv5
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import (
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"errors"
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"fmt"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/xenolf/lego/acme"
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"github.com/xenolf/lego/log"
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"github.com/xenolf/lego/platform/config/env"
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)
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// Gandi API reference: http://doc.livedns.gandi.net/
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const (
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// defaultBaseURL endpoint is the Gandi API endpoint used by Present and CleanUp.
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defaultBaseURL = "https://dns.api.gandi.net/api/v5"
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minTTL = 300
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)
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// findZoneByFqdn determines the DNS zone of an fqdn.
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// It is overridden during tests.
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var findZoneByFqdn = acme.FindZoneByFqdn
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// inProgressInfo contains information about an in-progress challenge
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type inProgressInfo struct {
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fieldName string
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authZone string
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}
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// Config is used to configure the creation of the DNSProvider
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type Config struct {
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BaseURL string
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APIKey string
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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TTL int
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HTTPClient *http.Client
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}
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// NewDefaultConfig returns a default configuration for the DNSProvider
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func NewDefaultConfig() *Config {
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return &Config{
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TTL: env.GetOrDefaultInt("GANDIV5_TTL", minTTL),
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PropagationTimeout: env.GetOrDefaultSecond("GANDIV5_PROPAGATION_TIMEOUT", 20*time.Minute),
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PollingInterval: env.GetOrDefaultSecond("GANDIV5_POLLING_INTERVAL", 20*time.Second),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond("GANDIV5_HTTP_TIMEOUT", 10*time.Second),
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},
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}
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}
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// DNSProvider is an implementation of the
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// acme.ChallengeProviderTimeout interface that uses Gandi's LiveDNS
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// API to manage TXT records for a domain.
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type DNSProvider struct {
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config *Config
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inProgressFQDNs map[string]inProgressInfo
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inProgressMu sync.Mutex
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}
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// NewDNSProvider returns a DNSProvider instance configured for Gandi.
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// Credentials must be passed in the environment variable: GANDIV5_API_KEY.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get("GANDIV5_API_KEY")
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if err != nil {
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return nil, fmt.Errorf("gandi: %v", err)
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}
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config := NewDefaultConfig()
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config.APIKey = values["GANDIV5_API_KEY"]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderCredentials uses the supplied credentials
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// to return a DNSProvider instance configured for Gandi.
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// Deprecated
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func NewDNSProviderCredentials(apiKey string) (*DNSProvider, error) {
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config := NewDefaultConfig()
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config.APIKey = apiKey
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for Gandi.
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func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
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if config == nil {
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return nil, errors.New("gandiv5: the configuration of the DNS provider is nil")
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}
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if config.APIKey == "" {
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return nil, fmt.Errorf("gandiv5: no API Key given")
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}
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if config.BaseURL == "" {
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config.BaseURL = defaultBaseURL
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}
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return &DNSProvider{
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config: config,
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inProgressFQDNs: make(map[string]inProgressInfo),
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}, nil
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}
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// Present creates a TXT record using the specified parameters.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
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fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
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if d.config.TTL < minTTL {
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d.config.TTL = minTTL // 300 is gandi minimum value for ttl
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}
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// find authZone
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authZone, err := findZoneByFqdn(fqdn, acme.RecursiveNameservers)
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if err != nil {
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return fmt.Errorf("gandiv5: findZoneByFqdn failure: %v", err)
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}
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// determine name of TXT record
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if !strings.HasSuffix(
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strings.ToLower(fqdn), strings.ToLower("."+authZone)) {
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return fmt.Errorf("gandiv5: unexpected authZone %s for fqdn %s", authZone, fqdn)
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}
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name := fqdn[:len(fqdn)-len("."+authZone)]
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// acquire lock and check there is not a challenge already in
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// progress for this value of authZone
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d.inProgressMu.Lock()
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defer d.inProgressMu.Unlock()
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// add TXT record into authZone
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err = d.addTXTRecord(acme.UnFqdn(authZone), name, value, d.config.TTL)
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if err != nil {
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return err
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}
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// save data necessary for CleanUp
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d.inProgressFQDNs[fqdn] = inProgressInfo{
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authZone: authZone,
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fieldName: name,
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}
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return nil
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}
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// CleanUp removes the TXT record matching the specified parameters.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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fqdn, _, _ := acme.DNS01Record(domain, keyAuth)
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// acquire lock and retrieve authZone
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d.inProgressMu.Lock()
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defer d.inProgressMu.Unlock()
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if _, ok := d.inProgressFQDNs[fqdn]; !ok {
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// if there is no cleanup information then just return
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return nil
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}
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fieldName := d.inProgressFQDNs[fqdn].fieldName
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authZone := d.inProgressFQDNs[fqdn].authZone
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delete(d.inProgressFQDNs, fqdn)
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// delete TXT record from authZone
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err := d.deleteTXTRecord(acme.UnFqdn(authZone), fieldName)
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if err != nil {
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return fmt.Errorf("gandiv5: %v", err)
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}
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return nil
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}
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// Timeout returns the values (20*time.Minute, 20*time.Second) which
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// are used by the acme package as timeout and check interval values
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// when checking for DNS record propagation with Gandi.
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func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
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return d.config.PropagationTimeout, d.config.PollingInterval
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}
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// functions to perform API actions
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func (d *DNSProvider) addTXTRecord(domain string, name string, value string, ttl int) error {
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// Get exiting values for the TXT records
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// Needed to create challenges for both wildcard and base name domains
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txtRecord, err := d.getTXTRecord(domain, name)
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if err != nil {
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return err
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}
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values := []string{value}
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if len(txtRecord.RRSetValues) > 0 {
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values = append(values, txtRecord.RRSetValues...)
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}
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target := fmt.Sprintf("domains/%s/records/%s/TXT", domain, name)
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newRecord := &Record{RRSetTTL: ttl, RRSetValues: values}
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req, err := d.newRequest(http.MethodPut, target, newRecord)
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if err != nil {
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return err
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}
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message := &apiResponse{}
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err = d.do(req, message)
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if err != nil {
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return fmt.Errorf("unable to create TXT record for domain %s and name %s: %v", domain, name, err)
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}
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if message != nil && len(message.Message) > 0 {
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log.Infof("API response: %s", message.Message)
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}
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return nil
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}
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func (d *DNSProvider) getTXTRecord(domain, name string) (*Record, error) {
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target := fmt.Sprintf("domains/%s/records/%s/TXT", domain, name)
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// Get exiting values for the TXT records
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// Needed to create challenges for both wildcard and base name domains
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req, err := d.newRequest(http.MethodGet, target, nil)
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if err != nil {
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return nil, err
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}
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txtRecord := &Record{}
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err = d.do(req, txtRecord)
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if err != nil {
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return nil, fmt.Errorf("unable to get TXT records for domain %s and name %s: %v", domain, name, err)
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}
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return txtRecord, nil
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}
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func (d *DNSProvider) deleteTXTRecord(domain string, name string) error {
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target := fmt.Sprintf("domains/%s/records/%s/TXT", domain, name)
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req, err := d.newRequest(http.MethodDelete, target, nil)
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if err != nil {
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return err
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}
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message := &apiResponse{}
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err = d.do(req, message)
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if err != nil {
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return fmt.Errorf("unable to delete TXT record for domain %s and name %s: %v", domain, name, err)
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}
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if message != nil && len(message.Message) > 0 {
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log.Infof("API response: %s", message.Message)
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}
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return nil
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}
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