# Copyright 2018 The Kubernetes Authors.
# Copyright 2024 Google LLC
#
# 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
#
#     https://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.

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: "gcsfuse-sidecar-validator.csi.storage.gke.io"
spec:
  matchConstraints:
    resourceRules:
    - apiGroups: [""]
      apiVersions: ["v1"]
      resources: ["pods"]
      operations: ["CREATE"]
  matchConditions:
  - name: "include-pods-with-gcsfuse-volumes"
    expression: 'object.metadata.?annotations["gke-gcsfuse/volumes"].orValue("") == "true"'
  - name: "include-pods-with-native-sidecar"
    expression: 'has(object.spec.initContainers) && object.spec.initContainers.exists(c, c.name == "gke-gcsfuse-sidecar")'
  variables:
  - name: "sidecar"
    expression: 'object.spec.initContainers.filter(c, c.name == "gke-gcsfuse-sidecar")[0]'
  validations:
  - messageExpression: '"the native gcsfuse sidecar init container must have restartPolicy:Always."'
    reason: Invalid
    expression: |-
      has(variables.sidecar.restartPolicy) &&
      variables.sidecar.restartPolicy == "Always"
  - messageExpression: '"the native gcsfuse sidecar init container must have env var NATIVE_SIDECAR with value TRUE."'
    reason: Invalid
    expression: |-
      has(variables.sidecar.env) &&
      variables.sidecar.env.exists(e, e.name == "NATIVE_SIDECAR" && e.value == "TRUE")
---
apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicyBinding
metadata:
  name: "gcsfuse-sidecar-validator-binding.csi.storage.gke.io"
spec:
  policyName: "gcsfuse-sidecar-validator.csi.storage.gke.io"
  validationActions: [Deny]
