adds audit-proxy image for dynamic audit e2e test

test/images/BUILD

@@ -12,6 +12,7 @@ filegroup(
     srcs = [
         ":package-srcs",
         "//test/images/apparmor-loader:all-srcs",
+        "//test/images/audit-proxy:all-srcs",
         "//test/images/crd-conversion-webhook:all-srcs",
         "//test/images/echoserver:all-srcs",
         "//test/images/entrypoint-tester:all-srcs",

test/images/audit-proxy/BUILD

@@ -0,0 +1,35 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["main.go"],
+    importpath = "k8s.io/kubernetes/test/images/audit-proxy",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/runtime/serializer/json:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/apis/audit/install:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/apis/audit/v1:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/audit:go_default_library",
+    ],
+)
+
+go_binary(
+    name = "audit-proxy",
+    embed = [":go_default_library"],
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

test/images/audit-proxy/Dockerfile

@@ -0,0 +1,17 @@
+# Copyright 2018 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.
+
+FROM scratch
+COPY audit-proxy /
+ENTRYPOINT ["/audit-proxy"]

test/images/audit-proxy/Makefile

@@ -0,0 +1,26 @@
+# Copyright 2018 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.
+
+SRCS=audit-proxy
+ARCH ?= amd64
+TARGET ?= $(CURDIR)
+GOARM=7
+GOLANG_VERSION ?= latest
+SRC_DIR = $(notdir $(shell pwd))
+export
+
+bin:
+	../image-util.sh bin $(SRCS)
+
+.PHONY: bin

test/images/audit-proxy/README.md

@@ -0,0 +1,4 @@
+# Audit Proxy
+
+The audit proxy is used to test dynamic auditing. It listens on port 8080 for incoming audit events and 
+writes them in a uniform manner to stdout.

test/images/audit-proxy/VERSION

@@ -0,0 +1 @@
+1.0

test/images/audit-proxy/main.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2019 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 (
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/serializer/json"
+	auditinstall "k8s.io/apiserver/pkg/apis/audit/install"
+	auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
+	"k8s.io/apiserver/pkg/audit"
+)
+
+var (
+	events  = []auditv1.Event{}
+	encoder runtime.Encoder
+	decoder runtime.Decoder
+)
+
+func main() {
+	scheme := runtime.NewScheme()
+	auditinstall.Install(scheme)
+	serializer := json.NewSerializer(json.DefaultMetaFactory, scheme, scheme, false)
+	encoder = audit.Codecs.EncoderForVersion(serializer, auditv1.SchemeGroupVersion)
+	decoder = audit.Codecs.UniversalDecoder(auditv1.SchemeGroupVersion)
+
+	http.HandleFunc("/", handler)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+func handler(w http.ResponseWriter, req *http.Request) {
+	body, err := ioutil.ReadAll(req.Body)
+	if err != nil {
+		log.Fatalf("could not read request body: %v", err)
+	}
+	el := &auditv1.EventList{}
+
+	if err := runtime.DecodeInto(decoder, body, el); err != nil {
+		log.Fatalf("failed decoding buf: %b, apiVersion: %s", body, auditv1.SchemeGroupVersion)
+	}
+	defer req.Body.Close()
+
+	// write events to stdout
+	for _, event := range el.Items {
+		err := encoder.Encode(&event, os.Stdout)
+		if err != nil {
+			log.Fatalf("could not encode audit event: %v", err)
+		}
+	}
+	w.WriteHeader(http.StatusOK)
+	return
+}