lego/providers/dns/gandi/gandi.go

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// Package gandi implements a DNS provider for solving the DNS-01 challenge using Gandi DNS.
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package gandi
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import (
"errors"
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"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/go-acme/lego/v3/challenge/dns01"
"github.com/go-acme/lego/v3/platform/config/env"
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)
// Gandi API reference: http://doc.rpc.gandi.net/index.html
// Gandi API domain examples: http://doc.rpc.gandi.net/domain/faq.html
const (
// defaultBaseURL Gandi XML-RPC endpoint used by Present and CleanUp
defaultBaseURL = "https://rpc.gandi.net/xmlrpc/"
minTTL = 300
)
// Config is used to configure the creation of the DNSProvider
type Config struct {
BaseURL string
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("GANDI_TTL", minTTL),
PropagationTimeout: env.GetOrDefaultSecond("GANDI_PROPAGATION_TIMEOUT", 40*time.Minute),
PollingInterval: env.GetOrDefaultSecond("GANDI_POLLING_INTERVAL", 60*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("GANDI_HTTP_TIMEOUT", 60*time.Second),
},
}
}
// inProgressInfo contains information about an in-progress challenge
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type inProgressInfo struct {
zoneID int // zoneID of gandi zone to restore in CleanUp
newZoneID int // zoneID of temporary gandi zone containing TXT record
authZone string // the domain name registered at gandi with trailing "."
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}
// DNSProvider is an implementation of the
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// challenge.ProviderTimeout interface that uses Gandi's XML-RPC
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// API to manage TXT records for a domain.
type DNSProvider struct {
inProgressFQDNs map[string]inProgressInfo
inProgressAuthZones map[string]struct{}
inProgressMu sync.Mutex
config *Config
// findZoneByFqdn determines the DNS zone of an fqdn. It is overridden during tests.
findZoneByFqdn func(fqdn string) (string, error)
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}
// NewDNSProvider returns a DNSProvider instance configured for Gandi.
// Credentials must be passed in the environment variable: GANDI_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get("GANDI_API_KEY")
if err != nil {
return nil, fmt.Errorf("gandi: %v", err)
}
config := NewDefaultConfig()
config.APIKey = values["GANDI_API_KEY"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Gandi.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("gandi: the configuration of the DNS provider is nil")
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}
if config.APIKey == "" {
return nil, fmt.Errorf("gandi: no API Key given")
}
if config.BaseURL == "" {
config.BaseURL = defaultBaseURL
}
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return &DNSProvider{
config: config,
inProgressFQDNs: make(map[string]inProgressInfo),
inProgressAuthZones: make(map[string]struct{}),
findZoneByFqdn: dns01.FindZoneByFqdn,
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}, nil
}
// Present creates a TXT record using the specified parameters. It
// does this by creating and activating a new temporary Gandi DNS
// zone. This new zone contains the TXT record.
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func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
if d.config.TTL < minTTL {
d.config.TTL = minTTL // 300 is gandi minimum value for ttl
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}
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// find authZone and Gandi zone_id for fqdn
authZone, err := d.findZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("gandi: findZoneByFqdn failure: %v", err)
}
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zoneID, err := d.getZoneID(authZone)
if err != nil {
return fmt.Errorf("gandi: %v", err)
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}
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// determine name of TXT record
if !strings.HasSuffix(
strings.ToLower(fqdn), strings.ToLower("."+authZone)) {
return fmt.Errorf("gandi: unexpected authZone %s for fqdn %s", authZone, fqdn)
}
name := fqdn[:len(fqdn)-len("."+authZone)]
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// acquire lock and check there is not a challenge already in
// progress for this value of authZone
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d.inProgressMu.Lock()
defer d.inProgressMu.Unlock()
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if _, ok := d.inProgressAuthZones[authZone]; ok {
return fmt.Errorf("gandi: challenge already in progress for authZone %s", authZone)
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}
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// perform API actions to create and activate new gandi zone
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// containing the required TXT record
newZoneName := fmt.Sprintf("%s [ACME Challenge %s]", dns01.UnFqdn(authZone), time.Now().Format(time.RFC822Z))
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newZoneID, err := d.cloneZone(zoneID, newZoneName)
if err != nil {
return err
}
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newZoneVersion, err := d.newZoneVersion(newZoneID)
if err != nil {
return fmt.Errorf("gandi: %v", err)
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}
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err = d.addTXTRecord(newZoneID, newZoneVersion, name, value, d.config.TTL)
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if err != nil {
return fmt.Errorf("gandi: %v", err)
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}
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err = d.setZoneVersion(newZoneID, newZoneVersion)
if err != nil {
return fmt.Errorf("gandi: %v", err)
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}
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err = d.setZone(authZone, newZoneID)
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if err != nil {
return fmt.Errorf("gandi: %v", err)
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}
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// save data necessary for CleanUp
d.inProgressFQDNs[fqdn] = inProgressInfo{
zoneID: zoneID,
newZoneID: newZoneID,
authZone: authZone,
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}
d.inProgressAuthZones[authZone] = struct{}{}
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return nil
}
// CleanUp removes the TXT record matching the specified
// parameters. It does this by restoring the old Gandi DNS zone and
// removing the temporary one created by Present.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, _ := dns01.GetRecord(domain, keyAuth)
// acquire lock and retrieve zoneID, newZoneID and authZone
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d.inProgressMu.Lock()
defer d.inProgressMu.Unlock()
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if _, ok := d.inProgressFQDNs[fqdn]; !ok {
// if there is no cleanup information then just return
return nil
}
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zoneID := d.inProgressFQDNs[fqdn].zoneID
newZoneID := d.inProgressFQDNs[fqdn].newZoneID
authZone := d.inProgressFQDNs[fqdn].authZone
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delete(d.inProgressFQDNs, fqdn)
delete(d.inProgressAuthZones, authZone)
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// perform API actions to restore old gandi zone for authZone
err := d.setZone(authZone, zoneID)
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if err != nil {
return fmt.Errorf("gandi: %v", err)
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}
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return d.deleteZone(newZoneID)
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}
// Timeout returns the values (40*time.Minute, 60*time.Second) which
// are used by the acme package as timeout and check interval values
// when checking for DNS record propagation with Gandi.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
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}