GCLOUD: Support ALIAS record type (#2225)

Co-authored-by: Tom Limoncelli <tal@whatexit.org>

documentation/providers.md

@@ -31,7 +31,7 @@ If a feature is definitively not supported for whatever reason, we would also li
 | [`EASYNAME`](providers/easyname.md) | ❌ | ❌ | ✅ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❌ | ✅ | ❔ |
 | [`EXOSCALE`](providers/exoscale.md) | ❌ | ✅ | ❌ | ✅ | ✅ | ❔ | ❌ | ❔ | ✅ | ❔ | ✅ | ❔ | ❌ | ❔ | ❌ | ❌ | ✅ | ❔ |
 | [`GANDI_V5`](providers/gandi_v5.md) | ❌ | ✅ | ✅ | ✅ | ✅ | ❔ | ❌ | ❔ | ✅ | ❔ | ✅ | ✅ | ✅ | ❌ | ❔ | ❌ | ❌ | ✅ |
-| [`GCLOUD`](providers/gcloud.md) | ✅ | ✅ | ❌ | ❔ | ✅ | ❔ | ❌ | ❔ | ✅ | ❔ | ✅ | ✅ | ✅ | ❔ | ✅ | ✅ | ✅ | ✅ |
+| [`GCLOUD`](providers/gcloud.md) | ✅ | ✅ | ❌ | ✅ | ✅ | ❔ | ❌ | ❔ | ✅ | ❔ | ✅ | ✅ | ✅ | ❔ | ✅ | ✅ | ✅ | ✅ |
 | [`GCORE`](providers/gcore.md) | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ | ❌ | ❔ | ✅ | ❌ | ❌ | ❌ | ✅ | ✅ | ✅ | ✅ |
 | [`HEDNS`](providers/hedns.md) | ❌ | ✅ | ❌ | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ | ❌ | ✅ | ✅ | ❌ | ❌ | ✅ | ✅ | ✅ | ✅ |
 | [`HETZNER`](providers/hetzner.md) | ❌ | ✅ | ❌ | ❌ | ✅ | ❔ | ❌ | ❔ | ❌ | ❔ | ✅ | ❌ | ✅ | ❌ | ✅ | ✅ | ✅ | ✅ |

pkg/rejectif/label.go

@@ -0,0 +1,18 @@
+package rejectif
+
+import (
+	"fmt"
+
+	"github.com/StackExchange/dnscontrol/v3/models"
+)
+
+// Keep these in alphabetical order.
+
+// LabelNotApex detects use not at apex. Use this when a record type
+// is only permitted at the apex.
+func LabelNotApex(rc *models.RecordConfig) error {
+	if rc.GetLabel() != "@" {
+		return fmt.Errorf("use not at apex")
+	}
+	return nil
+}

providers/gcloud/auditrecords.go

@@ -1,10 +1,17 @@
 package gcloud
 
-import "github.com/StackExchange/dnscontrol/v3/models"
+import (
+	"github.com/StackExchange/dnscontrol/v3/models"
+	"github.com/StackExchange/dnscontrol/v3/pkg/rejectif"
+)
 
 // AuditRecords returns a list of errors corresponding to the records
 // that aren't supported by this provider.  If all records are
 // supported, an empty list is returned.
 func AuditRecords(records []*models.RecordConfig) []error {
-	return nil
+	a := rejectif.Auditor{}
+
+	a.Add("ALIAS", rejectif.LabelNotApex) // Last verified 2023-03-24
+
+	return a.Audit(records)
 }

providers/gcloud/gcloudProvider.go

@@ -23,6 +23,7 @@ import (
 
 var features = providers.DocumentationNotes{
 	providers.CanGetZones:            providers.Can(),
+	providers.CanUseAlias:            providers.Can(),
 	providers.CanUseCAA:              providers.Can(),
 	providers.CanUseDSForChildren:    providers.Can(),
 	providers.CanUseLOC:              providers.Cannot(),