Add flux create secret receiver command

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

cmd/flux/create_secret_receiver.go

@@ -0,0 +1,131 @@
+/*
+Copyright 2026 The Flux authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/spf13/cobra"
+	corev1 "k8s.io/api/core/v1"
+	"sigs.k8s.io/yaml"
+
+	notificationv1 "github.com/fluxcd/notification-controller/api/v1"
+
+	"github.com/fluxcd/flux2/v2/internal/flags"
+	"github.com/fluxcd/flux2/v2/internal/utils"
+	"github.com/fluxcd/flux2/v2/pkg/manifestgen/sourcesecret"
+)
+
+var createSecretReceiverCmd = &cobra.Command{
+	Use:   "receiver [name]",
+	Short: "Create or update a Kubernetes secret for a Receiver webhook",
+	Long: `The create secret receiver command generates a Kubernetes secret with
+the token used for webhook payload validation and an annotation with the
+computed webhook URL.`,
+	Example: `  # Create a receiver secret for a GitHub webhook
+  flux create secret receiver github-receiver \
+    --namespace=my-namespace \
+    --type=github \
+    --hostname=flux.example.com \
+    --export
+
+  # Create a receiver secret for GCR with email claim
+  flux create secret receiver gcr-receiver \
+    --namespace=my-namespace \
+    --type=gcr \
+    --hostname=flux.example.com \
+    --email-claim=sa@project.iam.gserviceaccount.com \
+    --export`,
+	RunE: createSecretReceiverCmdRun,
+}
+
+type secretReceiverFlags struct {
+	receiverType flags.ReceiverType
+	token        string
+	hostname     string
+	emailClaim   string
+}
+
+var secretReceiverArgs secretReceiverFlags
+
+func init() {
+	createSecretReceiverCmd.Flags().Var(&secretReceiverArgs.receiverType, "type", secretReceiverArgs.receiverType.Description())
+	createSecretReceiverCmd.Flags().StringVar(&secretReceiverArgs.token, "token", "", "webhook token used for payload validation and URL computation, auto-generated if not specified")
+	createSecretReceiverCmd.Flags().StringVar(&secretReceiverArgs.hostname, "hostname", "", "hostname for the webhook URL e.g. flux.example.com")
+	createSecretReceiverCmd.Flags().StringVar(&secretReceiverArgs.emailClaim, "email-claim", "", "IAM service account email, required for gcr type")
+
+	createSecretCmd.AddCommand(createSecretReceiverCmd)
+}
+
+func createSecretReceiverCmdRun(cmd *cobra.Command, args []string) error {
+	name := args[0]
+
+	if secretReceiverArgs.receiverType == "" {
+		return fmt.Errorf("--type is required")
+	}
+
+	if secretReceiverArgs.hostname == "" {
+		return fmt.Errorf("--hostname is required")
+	}
+
+	if secretReceiverArgs.receiverType.String() == notificationv1.GCRReceiver && secretReceiverArgs.emailClaim == "" {
+		return fmt.Errorf("--email-claim is required for gcr receiver type")
+	}
+
+	labels, err := parseLabels()
+	if err != nil {
+		return err
+	}
+
+	opts := sourcesecret.Options{
+		Name:         name,
+		Namespace:    *kubeconfigArgs.Namespace,
+		Labels:       labels,
+		ReceiverType: secretReceiverArgs.receiverType.String(),
+		Token:        secretReceiverArgs.token,
+		Hostname:     secretReceiverArgs.hostname,
+		EmailClaim:   secretReceiverArgs.emailClaim,
+	}
+
+	secret, err := sourcesecret.GenerateReceiver(opts)
+	if err != nil {
+		return err
+	}
+
+	if createArgs.export {
+		rootCmd.Println(secret.Content)
+		return nil
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), rootArgs.timeout)
+	defer cancel()
+	kubeClient, err := utils.KubeClient(kubeconfigArgs, kubeclientOptions)
+	if err != nil {
+		return err
+	}
+	var s corev1.Secret
+	if err := yaml.Unmarshal([]byte(secret.Content), &s); err != nil {
+		return err
+	}
+	if err := upsertSecret(ctx, kubeClient, s); err != nil {
+		return err
+	}
+
+	logger.Actionf("receiver secret '%s' created in '%s' namespace", name, *kubeconfigArgs.Namespace)
+	return nil
+}