helm: add new ingressClass resource (#6882)

* helm: add new ingressClass resource

* add ingress parameters support

This commit adds ingress parameters support.
Credits go to Ariel Vinas: ariel@craftech.io

charts/ingress-nginx/templates/_helpers.tpl

@@ -122,3 +122,13 @@ Check the ingress controller version tag is at most three versions behind the la
 {{- fail "Controller container image tag should be 0.27.0 or higher" -}}
 {{- end -}}
 {{- end -}}
+
+{{/*
+IngressClass parameters.
+*/}}
+{{- define "ingressClass.parameters" -}}
+  {{- if .Values.controller.ingressClassResource.parameters -}}
+          parameters:
+{{ toYaml .Values.controller.ingressClassResource.parameters | indent 4}}
+  {{ end }}
+{{- end -}}

charts/ingress-nginx/templates/controller-ingressclass.yaml

@@ -0,0 +1,23 @@
+{{- if and (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) (.Values.controller.ingressClassResource.enabled) -}}
+{{- if and (semverCompare "=1.18-0" .Capabilities.KubeVersion.GitVersion)  }}
+apiVersion: networking.k8s.io/v1beta1
+{{- else }}
+apiVersion: networking.k8s.io/v1
+{{- end }}
+kind: IngressClass
+metadata:
+  labels:
+    {{- include "ingress-nginx.labels" . | nindent 4 }}
+    app.kubernetes.io/component: controller
+    {{- with .Values.controller.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+  name: {{ .Values.controller.ingressClass }}
+{{- if .Values.controller.ingressClassResource.default }}
+  annotations:
+    ingressclass.kubernetes.io/is-default-class: "true"
+{{- end }}
+spec:
+  controller: k8s.io/ingress-nginx
+  {{ template "ingressClass.parameters" . }}
+{{- end }}

charts/ingress-nginx/values.yaml

@@ -80,6 +80,17 @@ controller:
   ##
   ingressClass: nginx
 
+  # This section refers to the creation of the IngressClass resource
+  # IngressClass resources are supported since k8s >= 1.18
+  ingressClassResource:
+    enabled: false
+    default: false
+
+    # Parameters is a link to a custom resource containing additional
+    # configuration for the controller. This is optional if the controller
+    # does not require extra parameters.
+    parameters: {}
+
   # labels to add to the pod container metadata
   podLabels: {}
   #  key: value