#!/usr/bin/env bash

source .utils

set -e
WEBHOOK_TYPE="mutating"

print_usage() {
  blue "kube-disable-webhook - Disabled a webhook by modifying the namespace selector"
  echo " "
  underline "Usage:"
  echo "kube-disable-webhook [options] NAME"
  echo " "
  underline "Options:"
  echo "-h, --help            show this help text"
  echo "-t, --type            the type of webhook [mutating (default), validating]"
}

while test $# -gt 0; do
  case "$1" in
    -t|--type)
      shift
      WEBHOOK_TYPE=$1
      shift
      ;;
    -h|--help)
      print_usage
      exit 0
      ;;
    *)
      break
      ;;
  esac
done

NAME=${1}

FAKE_SELECTOR='"namespaceSelector":{"matchExpressions":[{"key":"disabled","operator":"In","values":["webhook"]}]}'

if [[ "${WEBHOOK_TYPE}" == "mutating" ]]; then
  printf "🚫 Disabling mutating webhook ${NAME}..."
  kubectl annotate mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} previous-state="$(kubectl get mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o json)" &>/dev/null
  HOOKS=$(kubectl get mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o go-template='{{range .webhooks}}{{.name}}{{"\n"}}{{end}}')
  for HOOK in ${HOOKS}
  do
    kubectl patch mutatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -p '{"webhooks": [{"name": "'${HOOK}'", '${FAKE_SELECTOR}'}]}' 1>/dev/null
  done
  printf " ✅  Done"
elif [[ "${WEBHOOK_TYPE}" == "validating" ]]; then
  printf "🚫 Disabling validating webhook ${NAME}..."
  kubectl annotate validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} previous-state="$(kubectl get validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o json)" &>/dev/null
  HOOKS=$(kubectl get validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -o go-template='{{range .webhooks}}{{.name}}{{"\n"}}{{end}}')
  for HOOK in ${HOOKS}
  do
    kubectl patch validatingwebhookconfigurations.admissionregistration.k8s.io ${NAME} -p '{"webhooks": [{"name": "'${HOOK}'", '${FAKE_SELECTOR}'}]}' 1>/dev/null
  done
  printf " ✅  Done"
else
  echo "Unknown webhook type"
  exit 1
fi