k8s.io/apiserver@v0.31.1/plugin/pkg/audit/webhook/webhook_test.go (about)

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package webhook
    18  
    19  import (
    20  	stdjson "encoding/json"
    21  	"fmt"
    22  	"io"
    23  	"io/ioutil"
    24  	"net/http"
    25  	"net/http/httptest"
    26  	"os"
    27  	"reflect"
    28  	"testing"
    29  	"time"
    30  
    31  	"github.com/stretchr/testify/assert"
    32  	"github.com/stretchr/testify/require"
    33  
    34  	"k8s.io/apimachinery/pkg/runtime"
    35  	"k8s.io/apimachinery/pkg/runtime/schema"
    36  	"k8s.io/apimachinery/pkg/runtime/serializer/json"
    37  	"k8s.io/apimachinery/pkg/util/wait"
    38  	auditinternal "k8s.io/apiserver/pkg/apis/audit"
    39  	auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
    40  	"k8s.io/apiserver/pkg/audit"
    41  	"k8s.io/client-go/tools/clientcmd/api/v1"
    42  )
    43  
    44  // newWebhookHandler returns a handler which receives webhook events and decodes the
    45  // request body. The caller passes a callback which is called on each webhook POST.
    46  // The object passed to cb is of the same type as list.
    47  func newWebhookHandler(t *testing.T, list runtime.Object, cb func(events runtime.Object)) http.Handler {
    48  	s := json.NewSerializer(json.DefaultMetaFactory, audit.Scheme, audit.Scheme, false)
    49  	return &testWebhookHandler{
    50  		t:          t,
    51  		list:       list,
    52  		onEvents:   cb,
    53  		serializer: s,
    54  	}
    55  }
    56  
    57  type testWebhookHandler struct {
    58  	t *testing.T
    59  
    60  	list     runtime.Object
    61  	onEvents func(events runtime.Object)
    62  
    63  	serializer runtime.Serializer
    64  }
    65  
    66  func (t *testWebhookHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    67  	err := func() error {
    68  		body, err := ioutil.ReadAll(r.Body)
    69  		if err != nil {
    70  			return fmt.Errorf("read webhook request body: %v", err)
    71  		}
    72  
    73  		obj, _, err := t.serializer.Decode(body, nil, t.list.DeepCopyObject())
    74  		if err != nil {
    75  			return fmt.Errorf("decode request body: %v", err)
    76  		}
    77  		if reflect.TypeOf(obj).Elem() != reflect.TypeOf(t.list).Elem() {
    78  			return fmt.Errorf("expected %T, got %T", t.list, obj)
    79  		}
    80  		t.onEvents(obj)
    81  		return nil
    82  	}()
    83  
    84  	if err == nil {
    85  		io.WriteString(w, "{}")
    86  		return
    87  	}
    88  	// In a goroutine, can't call Fatal.
    89  	assert.NoError(t.t, err, "failed to read request body")
    90  	http.Error(w, err.Error(), http.StatusInternalServerError)
    91  }
    92  
    93  func newWebhook(t *testing.T, endpoint string, groupVersion schema.GroupVersion) *backend {
    94  	config := v1.Config{
    95  		Clusters: []v1.NamedCluster{
    96  			{Cluster: v1.Cluster{Server: endpoint, InsecureSkipTLSVerify: true}},
    97  		},
    98  	}
    99  	f, err := ioutil.TempFile("", "k8s_audit_webhook_test_")
   100  	require.NoError(t, err, "creating temp file")
   101  
   102  	defer func() {
   103  		f.Close()
   104  		os.Remove(f.Name())
   105  	}()
   106  
   107  	// NOTE(ericchiang): Do we need to use a proper serializer?
   108  	require.NoError(t, stdjson.NewEncoder(f).Encode(config), "writing kubeconfig")
   109  
   110  	retryBackoff := wait.Backoff{
   111  		Duration: 500 * time.Millisecond,
   112  		Factor:   1.5,
   113  		Jitter:   0.2,
   114  		Steps:    5,
   115  	}
   116  	b, err := NewBackend(f.Name(), groupVersion, retryBackoff, nil)
   117  	require.NoError(t, err, "initializing backend")
   118  
   119  	return b.(*backend)
   120  }
   121  
   122  func TestWebhook(t *testing.T) {
   123  	versions := []schema.GroupVersion{auditv1.SchemeGroupVersion}
   124  	for _, version := range versions {
   125  		gotEvents := false
   126  
   127  		s := httptest.NewServer(newWebhookHandler(t, &auditv1.EventList{}, func(events runtime.Object) {
   128  			gotEvents = true
   129  		}))
   130  		defer s.Close()
   131  
   132  		backend := newWebhook(t, s.URL, auditv1.SchemeGroupVersion)
   133  
   134  		// Ensure this doesn't return a serialization error.
   135  		event := &auditinternal.Event{}
   136  		require.NoError(t, backend.processEvents(event), fmt.Sprintf("failed to send events, apiVersion: %s", version))
   137  		require.True(t, gotEvents, fmt.Sprintf("no events received, apiVersion: %s", version))
   138  	}
   139  }