rancher-partner-charts/charts/tetrate-istio/istiod-tid/templates/mutatingwebhook.yaml

{{- /* Core defines the common configuration used by all webhook segments */}}
{{- define "core" }}
{{- /* Kubernetes unfortunately requires a unique name for the webhook in some newer versions, so we assign
a unique prefix to each. */}}
- name: {{.Prefix}}sidecar-injector.istio.io
  clientConfig:
    {{- if .Values.istiodRemote.injectionURL }}
    url: "{{ .Values.istiodRemote.injectionURL }}"
    {{- else }}
    service:
      name: istiod{{- if not (eq .Values.revision "") }}-{{ .Values.revision }}{{- end }}
      namespace: {{ .Release.Namespace }}
      path: "{{ .Values.istiodRemote.injectionPath }}"
      port: 443
    {{- end }}
    caBundle: ""
  sideEffects: None
  rules:
  - operations: [ "CREATE" ]
    apiGroups: [""]
    apiVersions: ["v1"]
    resources: ["pods"]
  failurePolicy: Fail
  admissionReviewVersions: ["v1beta1", "v1"]
{{- end }}
{{- /* Installed for each revision - not installed for cluster resources ( cluster roles, bindings, crds) */}}
{{- if not .Values.global.operatorManageWebhooks }}
apiVersion: admissionregistration.k8s.io/v1
kind: MutatingWebhookConfiguration
metadata:
{{- if eq .Release.Namespace "istio-system"}}
  name: istio-sidecar-injector{{- if not (eq .Values.revision "") }}-{{ .Values.revision }}{{- end }}
{{- else }}
  name: istio-sidecar-injector{{- if not (eq .Values.revision "") }}-{{ .Values.revision }}{{- end }}-{{ .Release.Namespace }}
{{- end }}
  labels:
    istio.io/rev: {{ .Values.revision | default "default" }}
    install.operator.istio.io/owning-resource: {{ .Values.ownerName | default "unknown" }}
    operator.istio.io/component: "Pilot"
    app: sidecar-injector
    release: {{ .Release.Name }}
webhooks:
{{- /* Set up the selectors. First section is for revision, rest is for "default" revision */}}

{{- /* Case 1: namespace selector matches, and object doesn't disable */}}
{{- /* Note: if both revision and legacy selector, we give precedence to the legacy one */}}
{{- include "core" (mergeOverwrite (deepCopy .) (dict "Prefix" "rev.namespace.") ) }}
  namespaceSelector:
    matchExpressions:
    - key: istio.io/rev
      operator: In
      values:
      {{- if (eq .Values.revision "") }}
      - "default"
      {{- else }}
      - "{{ .Values.revision }}"
      {{- end }}
    - key: istio-injection
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: NotIn
      values:
      - "false"

{{- /* Case 2: No namespace selector, but object selects our revision (and doesn't disable) */}}
{{- include "core" (mergeOverwrite (deepCopy .) (dict "Prefix" "rev.object.") ) }}
  namespaceSelector:
    matchExpressions:
    - key: istio.io/rev
      operator: DoesNotExist
    - key: istio-injection
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: NotIn
      values:
      - "false"
    - key: istio.io/rev
      operator: In
      values:
      {{- if (eq .Values.revision "") }}
      - "default"
      {{- else }}
      - "{{ .Values.revision }}"
      {{- end }}


{{- /* Webhooks for default revision */}}
{{- if (eq .Values.revision "") }}

{{- /* Case 1: Namespace selector enabled, and object selector is not injected */}}
{{- include "core" (mergeOverwrite (deepCopy .) (dict "Prefix" "namespace.") ) }}
  namespaceSelector:
    matchExpressions:
    - key: istio-injection
      operator: In
      values:
      - enabled
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: NotIn
      values:
      - "false"

{{- /* Case 2: no namespace label, but object selector is enabled (and revision label is not, which has priority) */}}
{{- include "core" (mergeOverwrite (deepCopy .) (dict "Prefix" "object.") ) }}
  namespaceSelector:
    matchExpressions:
    - key: istio-injection
      operator: DoesNotExist
    - key: istio.io/rev
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: In
      values:
      - "true"
    - key: istio.io/rev
      operator: DoesNotExist

{{- if .Values.sidecarInjectorWebhook.enableNamespacesByDefault }}
{{- /* Special case 3: no labels at all */}}
{{- include "core" (mergeOverwrite (deepCopy .) (dict "Prefix" "auto.") ) }}
  namespaceSelector:
    matchExpressions:
    - key: istio-injection
      operator: DoesNotExist
    - key: istio.io/rev
      operator: DoesNotExist
  objectSelector:
    matchExpressions:
    - key: sidecar.istio.io/inject
      operator: DoesNotExist
    - key: istio.io/rev
      operator: DoesNotExist
{{- end }}

{{- end }}
{{- end }}