Generates a kubeconfig using the current context. Purpose is use static token instead of certificate files in kubeconfig

generate_kubeconfig_with_static_token

#! /bin/sh

kubectl -n kube-system create serviceaccount cluster-admin

cat <<EOF | kubectl apply -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: cluster-admin
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: cluster-admin
  namespace: kube-system
EOF

export USER_TOKEN_NAME=$(kubectl -n kube-system get serviceaccount cluster-admin -o=jsonpath='{.secrets[0].name}')
export USER_TOKEN_VALUE=$(kubectl -n kube-system get secret/${USER_TOKEN_NAME} -o=go-template='{{.data.token}}' | base64 --decode)
export CURRENT_CONTEXT=$(kubectl config current-context)
export CURRENT_CLUSTER=$(kubectl config view --raw -o=go-template='{{range .contexts}}{{if eq .name "'''${CURRENT_CONTEXT}'''"}}{{ index .context "cluster" }}{{end}}{{end}}')
export CLUSTER_SERVER=$(kubectl config view --raw -o=go-template='{{range .clusters}}{{if eq .name "'''${CURRENT_CLUSTER}'''"}}{{ .cluster.server }}{{end}}{{ end }}')

export CLUSTER_CA=$(kubectl config view --raw -o=go-template='{{range .clusters}}{{if eq .name "'''${CURRENT_CLUSTER}'''"}}{{with index .cluster "certificate-authority-data" }}{{.}}{{end}}{{ end }}{{ end }}')

if [ -z $CLUSTER_CA ]; then
  export CLUSTER_CA_FILE=$(kubectl config view --raw -o=go-template='{{range .clusters}}{{if eq .name "'''${CURRENT_CLUSTER}'''"}}{{with index .cluster "certificate-authority" }}{{.}}{{end}}{{ end }}{{ end }}')
  export CLUSTER_CA=$(cat $CLUSTER_CA_FILE | base64)
fi

cat <<EOF >cluster-admin-config
apiVersion: v1
kind: Config
current-context: ${CURRENT_CONTEXT}
contexts:
- name: ${CURRENT_CONTEXT}
  context:
    cluster: ${CURRENT_CONTEXT}
    user: cluster-admin
    namespace: kube-system
clusters:
- name: ${CURRENT_CONTEXT}
  cluster:
    certificate-authority-data: ${CLUSTER_CA}
    server: ${CLUSTER_SERVER}
users:
- name: cluster-admin
  user:
    token: ${USER_TOKEN_VALUE}
EOF

kubectl --kubeconfig $(pwd)/cluster-admin-config get po -A