add helm chart

.gitignore

@@ -10,3 +10,6 @@
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+
+helm/ssl
+admitCtlr

Dockerfile

@@ -0,0 +1,7 @@
+FROM alpine:3.10
+
+RUN apk update --no-cache && apk add ca-certificates
+
+COPY admitCtlr /admitCtlr
+
+ENTRYPOINT ["/admitCtlr"]

Makefile

@@ -0,0 +1,34 @@
+# Makefile
+
+APPNAME=admitCtlr
+IMAGE_NAME=liangrog/admission-webhook-server
+
+DOCKERFILE=Dockerfile
+
+VERSION_TAG=`git describe 2>/dev/null | cut -f 1 -d '-' 2>/dev/null`
+COMMIT_HASH=`git rev-parse --short=8 HEAD 2>/dev/null`
+BUILD_TIME=`date +%FT%T%z`
+LDFLAGS=-ldflags "-s -w \
+    -X main.CommitHash=${COMMIT_HASH} \
+    -X main.BuildTime=${BUILD_TIME} \
+    -X main.Tag=${VERSION_TAG}"
+
+all: clean test fast
+
+test:
+	go test -v ./...
+
+clean:
+	go clean
+	rm -r ./$(APPNAME) || true
+
+fast:
+	go build -o ${APPNAME} ${LDFLAGS}
+
+docker_binary:
+	CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o $(APPNAME) ${LDFLAGS} .
+
+docker_build:
+	docker build . -f $(DOCKERFILE) -t $(IMAGE_NAME) --no-cache
+
+docker: docker_binary docker_build

go.mod

@@ -0,0 +1,8 @@
+module github.com/liangrog/admission-webhook-server
+
+go 1.13
+
+require (
+	k8s.io/api v0.0.0-20191121015604-11707872ac1c
+	k8s.io/apimachinery v0.0.0-20191123233150-4c4803ed55e3
+)

go.sum

@@ -0,0 +1,102 @@
+github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
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helm/Chart.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+name: admission-webhook-server
+version: 0.0.1
+appVersion: 0.0.1
+description: 
+keywords:
+- admission controller
+- webhook
+home: https://github.com/liangrog/admission-webhook-server
+sources:
+- https://github.com/liangrog/admission-webhook-server
+engine: gotpl

helm/templates/_helpers.tpl

@@ -0,0 +1,32 @@
+{{/* vim: set filetype=mustache: */}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+*/}}
+{{- define "helper.fullname" -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Shared labels
+*/}}
+{{- define "helper.labels" }}
+app: "{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}"
+chart: "{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}"
+release: "{{ .Release.Name }}"
+heritage: "{{ .Release.Service }}"
+{{- end }}
+
+{{/*
+webhook server name
+*/}}
+{{- define "helper.webhook-server-name" }}
+{{- template "helper.fullname" . }}.{{ .Release.Namespace }}.svc
+{{- end }}
+

helm/templates/deployment.yaml

@@ -0,0 +1,43 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ template "helper.fullname" . }}
+  labels:
+{{- include "helper.labels" . | indent 4 }}
+spec:
+  replicas: {{ .Values.replicas }}
+  strategy:
+{{ toYaml .Values.strategy | indent 4 }}
+  selector:
+    matchLabels:
+{{- include "helper.labels" . | indent 6 }}
+  template:
+    metadata:
+      labels:
+{{- include "helper.labels" . | indent 8 }}
+    spec:
+      containers:
+      - name: {{ template "helper.fullname" . }}
+        image: "{{ .Values.image }}:{{ .Values.imageTag }}"
+        env:
+        {{- if .Values.basePathOverride }}
+        - name: BASE_PATH
+          value: {{ .Values.basePathOverride | quote }}
+        {{- end }}
+        {{- if .Values.podNodesSelectorPathOverride }}
+        - name: POD_NODES_SELECTOR_PATH
+          value: {{ .Values.podNodesSelectorPathOverride | quote }}
+        {{- end }}
+        - name: ENV_POD_NODES_SELECTOR_CONFIG
+          value: {{ .Values.podNodesSelectorConfig | quote}}
+        ports:
+        - name: https
+          containerPort: 8443
+        volumeMounts:
+        - name: tls
+          mountPath: /run/secrets/tls
+          readOnly: true
+      volumes:
+      - name: tls
+        secret:
+          secretName: {{ template "helper.fullname" . }}-tls

helm/templates/mutating-webhook-configuration.yaml

@@ -0,0 +1,24 @@
+---
+apiVersion: admissionregistration.k8s.io/v1beta1
+kind: MutatingWebhookConfiguration 
+metadata:
+  name: {{ template "helper.fullname" . }}
+  labels:
+{{- include "helper.labels" . | indent 4 }}
+webhooks:
+- name: {{ template "helper.webhook-server-name" . }} 
+  clientConfig: 
+    service:
+      namespace: {{ .Release.Namespace }}
+      name: {{ template "helper.fullname" . }}
+      path: '/{{ default "mutate" .Values.basePathOverride }}/{{ default "pod-nodes-selector" .Values.podNodesSelectorPathOverride }}' 
+    caBundle: '{{ .Files.Get "ssl/ca.crt" | b64enc }}'
+  rules: 
+  - operations: 
+    - CREATE
+    apiGroups:
+    - ""
+    apiVersions:
+    - "*"
+    resources:
+    - pods

helm/templates/secrets.yaml

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ template "helper.fullname" . }}-tls
+  labels:
+{{- include "helper.labels" . | indent 4}}
+type: kubernetes.io/tls
+data:
+  tls.crt: {{ .Files.Get "ssl/tls.crt" | b64enc }}
+  tls.key: {{ .Files.Get "ssl/tls.key" | b64enc }}

helm/templates/service.yaml

@@ -0,0 +1,20 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Values.service.name }}
+  labels:
+{{- include "helper.labels" . | indent 4}}
+{{- with .Values.service.annotations }}
+  annotations:
+{{ tpl (toYaml .) $ | indent 4 }}
+{{- end }}
+spec:
+  selector:
+{{- include "helper.labels" . | indent 4}}
+  type: {{ default "ClusterIP" .Values.service.type }}
+  ports:
+  - name: https
+    port: 443
+    targetPort: https
+

helm/values.yaml

@@ -0,0 +1,20 @@
+
+#nameOverride
+
+basePathOverride:
+podNodesSelectorPathOverride: 
+podNodesSelectorConfig:
+
+
+service:
+  name: mutate-webhook-server
+  #type: 
+  annotations: {}
+
+replicas: 1  
+
+strategy: 
+  type: RollingUpdate
+
+image: liangrog/admission-webhook-server
+imageTag: latest

main.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 
 	"github.com/liangrog/admission-webhook-server/pkg/admission/podnodesselector"
+	"github.com/liangrog/admission-webhook-server/pkg/utils"
 )
 
 // TLS secrets
@@ -36,7 +37,7 @@ func main() {
 	}
 
 	// Serve
-	log.Fatal(server.ListenAndServeTLS(certPath, keyPath))
+	log.Fatal(server.ListenAndServeTLS(cert, key))
 }
 
 // Register all admission handlers

pkg/admission/admit/admit.go

@@ -53,7 +53,7 @@ func isKubeNamespace(ns string) bool {
 // doServeAdmitFunc parses the HTTP request for an admission controller webhook, and -- in case of a well-formed
 // request -- delegates the admission control logic to the given admitFunc. The response body is then returned as raw
 // bytes.
-func doServeAdmitFunc(w http.ResponseWriter, r *http.Request, adm admitFunc) ([]byte, error) {
+func doServeAdmitFunc(w http.ResponseWriter, r *http.Request, adm AdmitFunc) ([]byte, error) {
 	// Step 1: Request validation. Only handle POST requests with a body and json content type.
 
 	if r.Method != http.MethodPost {
@@ -126,7 +126,7 @@ func doServeAdmitFunc(w http.ResponseWriter, r *http.Request, adm admitFunc) ([]
 }
 
 // serveAdmitFunc is a wrapper around doServeAdmitFunc that adds error handling and logging.
-func serveAdmitFunc(w http.ResponseWriter, r *http.Request, adm admitFunc) {
+func serveAdmitFunc(w http.ResponseWriter, r *http.Request, adm AdmitFunc) {
 	log.Print("Handling webhook request ...")
 
 	var writeErr error
@@ -145,7 +145,7 @@ func serveAdmitFunc(w http.ResponseWriter, r *http.Request, adm admitFunc) {
 }
 
 // admitFuncHandler takes an admitFunc and wraps it into a http.Handler by means of calling serveAdmitFunc.
-func AdmitFuncHandler(adm admitFunc) http.Handler {
+func AdmitFuncHandler(adm AdmitFunc) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		serveAdmitFunc(w, r, adm)
 	})