Sanitize availability zone name

Co-authored-by: stoney-cloud <info@stepping-stone.ch>

pkg/openstack/instancesv2.go

@@ -27,6 +27,7 @@ import (
 	cloudprovider "k8s.io/cloud-provider"
 	"k8s.io/cloud-provider-openstack/pkg/client"
 	"k8s.io/cloud-provider-openstack/pkg/metrics"
+	"k8s.io/cloud-provider-openstack/pkg/util"
 	"k8s.io/cloud-provider-openstack/pkg/util/errors"
 	"k8s.io/klog/v2"
 )
@@ -133,11 +134,13 @@ func (i *InstancesV2) InstanceMetadata(ctx context.Context, node *v1.Node) (*clo
 		return nil, err
 	}
 
+	availabilityZone := util.SanitizeLabel(server.AvailabilityZone)
+
 	return &cloudprovider.InstanceMetadata{
 		ProviderID:    i.makeInstanceID(&server),
 		InstanceType:  instanceType,
 		NodeAddresses: addresses,
-		Zone:          server.AvailabilityZone,
+		Zone:          availabilityZone,
 		Region:        i.region,
 	}, nil
 }

pkg/util/metadata/metadata.go

@@ -306,7 +306,7 @@ func (m *metadataService) GetAvailabilityZone() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return md.AvailabilityZone, nil
+	return util.SanitizeLabel(md.AvailabilityZone), nil
 }
 
 func CheckMetadataSearchOrder(order string) error {

pkg/util/util.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"regexp"
 	"strings"
 	"time"
 
@@ -167,3 +168,19 @@ func GetAZFromTopology(topologyKey string, requirement *csi.TopologyRequirement)
 
 	return zone
 }
+
+func SanitizeLabel(input string) string {
+	// Replace non-alphanumeric characters (except '-', '_', '.') with '-'
+	reg := regexp.MustCompile(`[^-a-zA-Z0-9_.]+`)
+	sanitized := reg.ReplaceAllString(input, "-")
+
+	// Ensure the label starts and ends with an alphanumeric character
+	sanitized = strings.Trim(sanitized, "-_.")
+
+	// Ensure the label is not longer than 63 characters
+	if len(sanitized) > 63 {
+		sanitized = sanitized[:63]
+	}
+
+	return sanitized
+}