From df3b738330e8b23669fd51bad118791540c5a040 Mon Sep 17 00:00:00 2001
From: joshvanl <me@joshvanl.dev>
Date: Wed, 18 Oct 2023 21:18:29 +0100
Subject: [PATCH] Delete injector mutating webhook on downgrade from 1.12 to
 1.11

Signed-off-by: joshvanl <me@joshvanl.dev>
---
 cmd/upgrade.go            |  3 ++-
 pkg/kubernetes/upgrade.go | 51 ++++++++++++++++++++++++++++++++++++---
 2 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/cmd/upgrade.go b/cmd/upgrade.go
index ee54a7e47..c01714635 100644
--- a/cmd/upgrade.go
+++ b/cmd/upgrade.go
@@ -14,6 +14,7 @@ limitations under the License.
 package cmd
 
 import (
+	"context"
 	"os"
 	"strings"
 
@@ -57,7 +58,7 @@ dapr upgrade -k
 			print.FailureStatusEvent(os.Stderr, err.Error())
 			os.Exit(1)
 		}
-		err = kubernetes.Upgrade(kubernetes.UpgradeConfig{
+		err = kubernetes.Upgrade(context.Background(), kubernetes.UpgradeConfig{
 			RuntimeVersion:   upgradeRuntimeVersion,
 			DashboardVersion: upgradeDashboardVersion,
 			Args:             values,
diff --git a/pkg/kubernetes/upgrade.go b/pkg/kubernetes/upgrade.go
index f2c944ce7..69dc8696d 100644
--- a/pkg/kubernetes/upgrade.go
+++ b/pkg/kubernetes/upgrade.go
@@ -14,17 +14,21 @@ limitations under the License.
 package kubernetes
 
 import (
+	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"os"
 	"time"
 
+	"github.com/hashicorp/go-version"
 	helm "helm.sh/helm/v3/pkg/action"
 	"helm.sh/helm/v3/pkg/chart"
+	admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/helm/pkg/strvals"
 
-	"github.com/hashicorp/go-version"
-
 	"github.com/dapr/cli/pkg/print"
 	"github.com/dapr/cli/utils"
 )
@@ -56,7 +60,7 @@ type UpgradeConfig struct {
 	ImageVariant     string
 }
 
-func Upgrade(conf UpgradeConfig) error {
+func Upgrade(ctx context.Context, conf UpgradeConfig) error {
 	helmRepo := utils.GetEnv("DAPR_HELM_REPO_URL", daprHelmRepo)
 	status, err := GetDaprResourcesStatus()
 	if err != nil {
@@ -166,7 +170,31 @@ func Upgrade(conf UpgradeConfig) error {
 		return err
 	}
 
+	client, err := Client()
+	if err != nil {
+		return err
+	}
+
+	var mutatingWebhookConf *admissionregistrationv1.MutatingWebhookConfiguration
+	if is12to11Downgrade(conf.RuntimeVersion, daprVersion) {
+		print.InfoStatusEvent(os.Stdout, "Downgrade from 1.12 to 1.11 detected, temporarily deleting injector mutating webhook...")
+
+		mutatingWebhookConf, err = client.AdmissionregistrationV1().MutatingWebhookConfigurations().Get(ctx, "dapr-sidecar-injector", metav1.GetOptions{})
+		if err != nil && !apierrors.IsNotFound(err) {
+			return err
+		}
+
+		err = client.AdmissionregistrationV1().MutatingWebhookConfigurations().Delete(ctx, "dapr-sidecar-injector", metav1.DeleteOptions{})
+		if err != nil && !apierrors.IsNotFound(err) {
+			return err
+		}
+	}
+
 	if _, err = upgradeClient.Run(chart, controlPlaneChart, vals); err != nil {
+		if mutatingWebhookConf != nil {
+			_, merr := client.AdmissionregistrationV1().MutatingWebhookConfigurations().Create(ctx, mutatingWebhookConf, metav1.CreateOptions{})
+			return errors.Join(err, merr)
+		}
 		return err
 	}
 
@@ -264,3 +292,20 @@ func isDowngrade(targetVersion, existingVersion string) bool {
 	}
 	return target.LessThan(existing)
 }
+
+func is12to11Downgrade(targetVersion, existingVersion string) bool {
+	target, _ := version.NewVersion(targetVersion)
+	existing, _ := version.NewVersion(existingVersion)
+	if target == nil || existing == nil {
+		return false
+	}
+
+	tset := target.Segments()
+	eset := existing.Segments()
+
+	if len(eset) < 2 || len(tset) < 2 {
+		return false
+	}
+
+	return eset[0] == 1 && eset[1] == 12 && tset[0] == 1 && tset[1] == 11
+}