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examples/customization/external-auth-headers/authsvc/Dockerfile

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+FROM alpine:3.5
+MAINTAINER Roman Safronov <electroma@gmail.com>
+COPY authsvc /
+EXPOSE 8080
+ENTRYPOINT ["/authsvc"]

examples/customization/external-auth-headers/authsvc/authsvc.go

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+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"fmt"
+	"math/rand"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+// Sample authentication service returning several HTTP headers in response
+func main() {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if strings.ContainsAny(r.Header.Get("User"), "internal") {
+			w.Header().Add("UserID", strconv.Itoa(rand.Int()))
+			w.Header().Add("UserRole", "admin")
+			w.Header().Add("Other", "not used")
+			fmt.Fprint(w, "ok")
+		} else {
+			rc := http.StatusForbidden
+			if c := r.URL.Query().Get("code"); len(c) > 0 {
+				c, _ := strconv.Atoi(c)
+				if c > 0 && c < 600 {
+					rc = c
+				}
+			}
+
+			w.WriteHeader(rc)
+			fmt.Fprint(w, "unauthorized")
+		}
+	})
+	http.ListenAndServe(":8080", nil)
+}