Cherry pick v1.7 into master

vendor/github.com/xenolf/lego/providers/dns/inwx/inwx.go

@@ -0,0 +1,166 @@
+// Package inwx implements a DNS provider for solving the DNS-01 challenge using inwx dom robot
+package inwx
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/smueller18/goinwx"
+	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/log"
+	"github.com/xenolf/lego/platform/config/env"
+)
+
+// Config is used to configure the creation of the DNSProvider
+type Config struct {
+	Username           string
+	Password           string
+	Sandbox            bool
+	PropagationTimeout time.Duration
+	PollingInterval    time.Duration
+	TTL                int
+}
+
+// NewDefaultConfig returns a default configuration for the DNSProvider
+func NewDefaultConfig() *Config {
+	return &Config{
+		PropagationTimeout: env.GetOrDefaultSecond("INWX_PROPAGATION_TIMEOUT", acme.DefaultPropagationTimeout),
+		PollingInterval:    env.GetOrDefaultSecond("INWX_POLLING_INTERVAL", acme.DefaultPollingInterval),
+		TTL:                env.GetOrDefaultInt("INWX_TTL", 300),
+		Sandbox:            env.GetOrDefaultBool("INWX_SANDBOX", false),
+	}
+}
+
+// DNSProvider is an implementation of the acme.ChallengeProvider interface
+type DNSProvider struct {
+	config *Config
+	client *goinwx.Client
+}
+
+// NewDNSProvider returns a DNSProvider instance configured for Dyn DNS.
+// Credentials must be passed in the environment variables:
+// INWX_USERNAME and INWX_PASSWORD.
+func NewDNSProvider() (*DNSProvider, error) {
+	values, err := env.Get("INWX_USERNAME", "INWX_PASSWORD")
+	if err != nil {
+		return nil, fmt.Errorf("inwx: %v", err)
+	}
+
+	config := NewDefaultConfig()
+	config.Username = values["INWX_USERNAME"]
+	config.Password = values["INWX_PASSWORD"]
+
+	return NewDNSProviderConfig(config)
+}
+
+// NewDNSProviderConfig return a DNSProvider instance configured for Dyn DNS
+func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
+	if config == nil {
+		return nil, errors.New("inwx: the configuration of the DNS provider is nil")
+	}
+
+	if config.Username == "" || config.Password == "" {
+		return nil, fmt.Errorf("inwx: credentials missing")
+	}
+
+	if config.Sandbox {
+		log.Infof("inwx: sandbox mode is enabled")
+	}
+
+	client := goinwx.NewClient(config.Username, config.Password, &goinwx.ClientOptions{Sandbox: config.Sandbox})
+
+	return &DNSProvider{config: config, client: client}, 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)
+
+	authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
+	if err != nil {
+		return fmt.Errorf("inwx: %v", err)
+	}
+
+	err = d.client.Account.Login()
+	if err != nil {
+		return fmt.Errorf("inwx: %v", err)
+	}
+
+	defer func() {
+		errL := d.client.Account.Logout()
+		if errL != nil {
+			log.Infof("inwx: failed to logout: %v", errL)
+		}
+	}()
+
+	var request = &goinwx.NameserverRecordRequest{
+		Domain:  acme.UnFqdn(authZone),
+		Name:    acme.UnFqdn(fqdn),
+		Type:    "TXT",
+		Content: value,
+		Ttl:     d.config.TTL,
+	}
+
+	_, err = d.client.Nameservers.CreateRecord(request)
+	if err != nil {
+		switch err.(type) {
+		case *goinwx.ErrorResponse:
+			if err.(*goinwx.ErrorResponse).Message == "Object exists" {
+				return nil
+			}
+			return fmt.Errorf("inwx: %v", err)
+		default:
+			return fmt.Errorf("inwx: %v", err)
+		}
+	}
+
+	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)
+
+	authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
+	if err != nil {
+		return fmt.Errorf("inwx: %v", err)
+	}
+
+	err = d.client.Account.Login()
+	if err != nil {
+		return fmt.Errorf("inwx: %v", err)
+	}
+
+	defer func() {
+		errL := d.client.Account.Logout()
+		if errL != nil {
+			log.Infof("inwx: failed to logout: %v", errL)
+		}
+	}()
+
+	response, err := d.client.Nameservers.Info(&goinwx.NameserverInfoRequest{
+		Domain: acme.UnFqdn(authZone),
+		Name:   acme.UnFqdn(fqdn),
+		Type:   "TXT",
+	})
+	if err != nil {
+		return fmt.Errorf("inwx: %v", err)
+	}
+
+	var lastErr error
+	for _, record := range response.Records {
+		err = d.client.Nameservers.DeleteRecord(record.Id)
+		if err != nil {
+			lastErr = fmt.Errorf("inwx: %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
+}