Fix: gcloud wildcard (#643)

* fix: gcloud wildcard.

* refactor: minor changes.

acme/client.go

@@ -593,7 +593,7 @@ func (c *Client) solveChallengeForAuthz(authorizations []authorization) error {
 		}
 	}
 
-	// for all valid presolvers, first submit the challenges so they have max time to propigate
+	// for all valid presolvers, first submit the challenges so they have max time to propagate
 	for _, item := range authSolvers {
 		authz := item.authz
 		i := item.challengeIndex

acme/dns_challenge.go

@@ -30,6 +30,9 @@ const (
 
 	// DefaultPollingInterval default polling interval
 	DefaultPollingInterval = 2 * time.Second
+
+	// DefaultTTL default TTL
+	DefaultTTL = 120
 )
 
 var defaultNameservers = []string{
@@ -67,7 +70,7 @@ func DNS01Record(domain, keyAuth string) (fqdn string, value string, ttl int) {
 	keyAuthShaBytes := sha256.Sum256([]byte(keyAuth))
 	// base64URL encoding without padding
 	value = base64.RawURLEncoding.EncodeToString(keyAuthShaBytes[:sha256.Size])
-	ttl = 120
+	ttl = DefaultTTL
 	fqdn = fmt.Sprintf("_acme-challenge.%s.", domain)
 	return
 }
@@ -149,6 +152,7 @@ func checkDNSPropagation(fqdn, value string) (bool, error) {
 	if err != nil {
 		return false, err
 	}
+
 	if r.Rcode == dns.RcodeSuccess {
 		// If we see a CNAME here then use the alias
 		for _, rr := range r.Answer {

providers/dns/gcloud/googlecloud.go

@@ -131,26 +131,33 @@ func (d *DNSProvider) Present(domain, token, keyAuth string) error {
 		return fmt.Errorf("googlecloud: %v", err)
 	}
 
+	// Look for existing records.
+	existing, err := d.findTxtRecords(zone, fqdn)
+	if err != nil {
+		return fmt.Errorf("googlecloud: %v", err)
+	}
+
 	rec := &dns.ResourceRecordSet{
 		Name:    fqdn,
 		Rrdatas: []string{value},
 		Ttl:     int64(d.config.TTL),
 		Type:    "TXT",
 	}
-	change := &dns.Change{
-		Additions: []*dns.ResourceRecordSet{rec},
-	}
 
-	// Look for existing records.
-	existing, err := d.findTxtRecords(zone, fqdn)
-	if err != nil {
-		return fmt.Errorf("googlecloud: %v", err)
-	}
+	change := &dns.Change{}
+
 	if len(existing) > 0 {
 		// Attempt to delete the existing records when adding our new one.
 		change.Deletions = existing
+
+		// Append existing TXT record data to the new TXT record data
+		for _, value := range existing {
+			rec.Rrdatas = append(rec.Rrdatas, value.Rrdatas...)
+		}
 	}
 
+	change.Additions = []*dns.ResourceRecordSet{rec}
+
 	chg, err := d.client.Changes.Create(d.config.Project, zone, change).Do()
 	if err != nil {
 		return fmt.Errorf("googlecloud: %v", err)

providers/dns/gcloud/googlecloud_test.go

@@ -5,11 +5,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"golang.org/x/net/context"
 	"golang.org/x/oauth2/google"
 	"google.golang.org/api/dns/v1"
-
-	"github.com/stretchr/testify/assert"
 )
 
 var (