Unique Ingress Host and Path

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: unique-ingress-host-and-path
  annotations:
    policies.kyverno.io/title: Unique Ingress Host and Path
    policies.kyverno.io/category: Sample
    policies.kyverno.io/severity: medium
    policies.kyverno.io/subject: Ingress
    kyverno.io/kyverno-version: 1.7.0
    policies.kyverno.io/minversion: 1.6.0
    kyverno.io/kubernetes-version: "1.23"
    policies.kyverno.io/description: Similar to the ability to check the uniqueness of hosts and paths independently, it is possible to check for uniqueness of them both together across a cluster. This policy ensures that no Ingress can be created or updated unless it is globally unique with respect to host plus path combination.
spec:
  validationFailureAction: Audit
  background: false
  rules:
    - name: check-host-path-combo
      match:
        any:
          - resources:
              kinds:
                - Ingress
      preconditions:
        all:
          - key: "{{ request.operation || 'BACKGROUND' }}"
            operator: NotEquals
            value: DELETE
      context:
        - name: rules
          apiCall:
            urlPath: /apis/networking.k8s.io/v1/ingresses
            jmesPath: items[].spec.rules[]
      validate:
        message: The Ingress host and path combination must be unique across the cluster.
        foreach:
          - list: request.object.spec.rules[]
            deny:
              conditions:
                all:
                  - key: "{{ element.http.paths[].path }}"
                    operator: AnyIn
                    value: "{{ rules[?host=='{{element.host}}'][].http.paths[].path }}"