chore: backport 20260527

.github/workflows/codespell.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@a5ad31d6a139d249332a2605b85202e8c0b78450 # v2.19.1
+        uses: step-security/harden-runner@9ca718d3bf646d6534007c269a635b3e54cadf99 # v2.19.2
         with:
           egress-policy: audit
 

pkg/admissionpolicymanager/commons.go

@@ -0,0 +1,84 @@
+/*
+Copyright 2026 The KubeFleet 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 admissionpolicymanager
+
+import (
+	"context"
+	"regexp"
+	"strings"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	"go.goms.io/fleet/pkg/utils/errors"
+)
+
+const (
+	// illegalCELStringChars is a string of characters that should not be used in CEL string literals.
+	illegalCELStringChars = `'"\`
+)
+
+var (
+	// reservedNamespacePrefixRegexp matches valid namespace prefix characters (DNS label subset).
+	reservedNamespacePrefixRegexp = regexp.MustCompile(`^[a-z0-9-]+$`)
+)
+
+var (
+	managedByAndPartOfKubeFleetLabelSelector = client.MatchingLabels{
+		VAPManagedByKubeFleetLabelKey: VAPManagedByKubeFleetLabelValue,
+		VAPPartOfKubeFleetLabelKey:    VAPPartOfKubeFleetLabelValue,
+		VAPComponentKubeFleetLabelKey: VAPComponentAdmissionPolicyManagerLabelValue,
+	}
+)
+
+var (
+	// buildRetryUnlessCtxErr returns a function that is used with retry.OnError to stop
+	// retrying if the parent context has been cancelled or is erred.
+	buildRetryUnlessCtxErr = func(ctx context.Context) func(error) bool {
+		return func(err error) bool {
+			if err := ctx.Err(); err != nil {
+				return false
+			}
+			return true
+		}
+	}
+)
+
+// addManagedByPartOfAndComponentLabels adds labels to the given object to indicate that it is managed by
+// KubeFleet and belongs to the admission policy manager component.
+func addManagedByPartOfAndComponentLabels(obj metav1.Object) {
+	labels := obj.GetLabels()
+	if labels == nil {
+		labels = make(map[string]string)
+	}
+
+	labels[VAPManagedByKubeFleetLabelKey] = VAPManagedByKubeFleetLabelValue
+	labels[VAPPartOfKubeFleetLabelKey] = VAPPartOfKubeFleetLabelValue
+	labels[VAPComponentKubeFleetLabelKey] = VAPComponentAdmissionPolicyManagerLabelValue
+	obj.SetLabels(labels)
+}
+
+// validateCELStringLiterals checks if any of the provided strings contains characters that are illegal
+// in CEL string literals (e.g., backslash, double quotes, and single quotes).
+func validateCELStringLiterals(strs ...string) error {
+	for _, str := range strs {
+		if strings.ContainsAny(str, illegalCELStringChars) {
+			return errors.NewUserError(nil, "string literal contains illegal characters for a CEL expression", "value", str)
+		}
+	}
+	return nil
+}

pkg/admissionpolicymanager/configs.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2026 The KubeFleet 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 admissionpolicymanager
+
+import (
+	"go.goms.io/fleet/pkg/utils"
+)
+
+// PolicyGeneratorConfigs holds the configurations for all available admission policy
+// generators.
+//
+// This type is exposed so that users can provide a configuration object (in its serialized form)
+// that specifies individual configurations for each generator.
+type PolicyGeneratorConfigs struct {
+	PodsAndReplicaSetsVAPGeneratorConfig          *PodsAndReplicaSetsValidatingAdmissionPolicyGenerator              `json:"denyPodsAndReplicaSetsOutsideReservedNamespaces,omitempty"`
+	SvcAccountsAndTokenRequestsVAPGeneratorConfig *ServiceAccountsAndTokenRequestsValidatingAdmissionPolicyGenerator `json:"denyServiceAccountsAndTokenRequestsInReservedNamespaces,omitempty"`
+}
+
+// DefaultPolicyGeneratorConfigs is the default configuration for all available admission policy generators.
+var DefaultPolicyGeneratorConfigs = &PolicyGeneratorConfigs{
+	PodsAndReplicaSetsVAPGeneratorConfig: &PodsAndReplicaSetsValidatingAdmissionPolicyGenerator{
+		ReservedNamespacePrefixes: []string{utils.FleetNSNamePrefix, utils.KubeNSNamePrefix},
+	},
+	SvcAccountsAndTokenRequestsVAPGeneratorConfig: &ServiceAccountsAndTokenRequestsValidatingAdmissionPolicyGenerator{
+		ReservedNamespacePrefixes: []string{utils.FleetNSNamePrefix, utils.KubeNSNamePrefix},
+	},
+}