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lego/providers/dns/glesys/glesys.go
2020-09-02 20:38:01 +02:00

158 lines
4.5 KiB
Go

// Package glesys implements a DNS provider for solving the DNS-01 challenge using GleSYS api.
package glesys
import (
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
)
const (
// defaultBaseURL is the GleSYS API endpoint used by Present and CleanUp.
defaultBaseURL = "https://api.glesys.com/domain"
minTTL = 60
)
// Environment variables names.
const (
envNamespace = "GLESYS_"
EnvAPIUser = envNamespace + "API_USER"
EnvAPIKey = envNamespace + "API_KEY"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
APIUser 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(EnvTTL, minTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, 20*time.Minute),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, 20*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 10*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
activeRecords map[string]int
inProgressMu sync.Mutex
}
// NewDNSProvider returns a DNSProvider instance configured for GleSYS.
// Credentials must be passed in the environment variables:
// GLESYS_API_USER and GLESYS_API_KEY.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIUser, EnvAPIKey)
if err != nil {
return nil, fmt.Errorf("glesys: %w", err)
}
config := NewDefaultConfig()
config.APIUser = values[EnvAPIUser]
config.APIKey = values[EnvAPIKey]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for GleSYS.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("glesys: the configuration of the DNS provider is nil")
}
if config.APIUser == "" || config.APIKey == "" {
return nil, errors.New("glesys: incomplete credentials provided")
}
if config.TTL < minTTL {
return nil, fmt.Errorf("glesys: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
}
return &DNSProvider{
config: config,
activeRecords: make(map[string]int),
}, nil
}
// Present creates a TXT record using the specified parameters.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
// find authZone
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return fmt.Errorf("glesys: findZoneByFqdn failure: %w", err)
}
// determine name of TXT record
if !strings.HasSuffix(
strings.ToLower(fqdn), strings.ToLower("."+authZone)) {
return fmt.Errorf("glesys: unexpected authZone %s for fqdn %s", authZone, fqdn)
}
name := fqdn[:len(fqdn)-len("."+authZone)]
// acquire lock and check there is not a challenge already in
// progress for this value of authZone
d.inProgressMu.Lock()
defer d.inProgressMu.Unlock()
// add TXT record into authZone
recordID, err := d.addTXTRecord(domain, dns01.UnFqdn(authZone), name, value, d.config.TTL)
if err != nil {
return err
}
// save data necessary for CleanUp
d.activeRecords[fqdn] = recordID
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)
// acquire lock and retrieve authZone
d.inProgressMu.Lock()
defer d.inProgressMu.Unlock()
if _, ok := d.activeRecords[fqdn]; !ok {
// if there is no cleanup information then just return
return nil
}
recordID := d.activeRecords[fqdn]
delete(d.activeRecords, fqdn)
// delete TXT record from authZone
return d.deleteTXTRecord(domain, recordID)
}
// Timeout returns the values (20*time.Minute, 20*time.Second) which
// are used by the acme package as timeout and check interval values
// when checking for DNS record propagation with GleSYS.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}