lego/providers/dns/glesys/glesys.go
2018-10-11 15:49:33 +02:00

222 lines
6.4 KiB
Go

// Package glesys implements a DNS provider for solving the DNS-01
// challenge using GleSYS api.
package glesys
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/xenolf/lego/acme"
"github.com/xenolf/lego/log"
"github.com/xenolf/lego/platform/config/env"
)
// GleSYS API reference: https://github.com/GleSYS/API/wiki/API-Documentation
const (
// defaultBaseURL is the GleSYS API endpoint used by Present and CleanUp.
defaultBaseURL = "https://api.glesys.com/domain"
minTTL = 60
)
// 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("GLESYS_TTL", minTTL),
PropagationTimeout: env.GetOrDefaultSecond("GLESYS_PROPAGATION_TIMEOUT", 20*time.Minute),
PollingInterval: env.GetOrDefaultSecond("GLESYS_POLLING_INTERVAL", 20*time.Second),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond("GLESYS_HTTP_TIMEOUT", 10*time.Second),
},
}
}
// DNSProvider is an implementation of the
// acme.ChallengeProviderTimeout interface that uses GleSYS
// API to manage TXT records for a domain.
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("GLESYS_API_USER", "GLESYS_API_KEY")
if err != nil {
return nil, fmt.Errorf("glesys: %v", err)
}
config := NewDefaultConfig()
config.APIUser = values["GLESYS_API_USER"]
config.APIKey = values["GLESYS_API_KEY"]
return NewDNSProviderConfig(config)
}
// NewDNSProviderCredentials uses the supplied credentials
// to return a DNSProvider instance configured for GleSYS.
// Deprecated
func NewDNSProviderCredentials(apiUser string, apiKey string) (*DNSProvider, error) {
config := NewDefaultConfig()
config.APIUser = apiUser
config.APIKey = apiKey
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, fmt.Errorf("glesys: incomplete credentials provided")
}
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, _ := acme.DNS01Record(domain, keyAuth)
if d.config.TTL < minTTL {
d.config.TTL = minTTL // 60 is GleSYS minimum value for ttl
}
// find authZone
authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
if err != nil {
return fmt.Errorf("glesys: findZoneByFqdn failure: %v", 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, acme.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, _, _ := acme.DNS01Record(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
}
func (d *DNSProvider) sendRequest(method string, resource string, payload interface{}) (*responseStruct, error) {
url := fmt.Sprintf("%s/%s", defaultBaseURL, resource)
body, err := json.Marshal(payload)
if err != nil {
return nil, err
}
req, err := http.NewRequest(method, url, bytes.NewReader(body))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.SetBasicAuth(d.config.APIUser, d.config.APIKey)
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return nil, fmt.Errorf("request failed with HTTP status code %d", resp.StatusCode)
}
var response responseStruct
err = json.NewDecoder(resp.Body).Decode(&response)
return &response, err
}
// functions to perform API actions
func (d *DNSProvider) addTXTRecord(fqdn string, domain string, name string, value string, ttl int) (int, error) {
response, err := d.sendRequest(http.MethodPost, "addrecord", addRecordRequest{
DomainName: domain,
Host: name,
Type: "TXT",
Data: value,
TTL: ttl,
})
if response != nil && response.Response.Status.Code == http.StatusOK {
log.Infof("[%s]: Successfully created record id %d", fqdn, response.Response.Record.RecordID)
return response.Response.Record.RecordID, nil
}
return 0, err
}
func (d *DNSProvider) deleteTXTRecord(fqdn string, recordid int) error {
response, err := d.sendRequest(http.MethodPost, "deleterecord", deleteRecordRequest{
RecordID: recordid,
})
if response != nil && response.Response.Status.Code == 200 {
log.Infof("[%s]: Successfully deleted record id %d", fqdn, recordid)
}
return err
}