admission_test.go

Documentation: k8s.io/kubernetes/plugin/pkg/admission/network/denyserviceexternalips

     1  /*
     2  Copyright 2020 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 denyserviceexternalips
    18  
    19  import (
    20  	"context"
    21  	"testing"
    22  
    23  	corev1 "k8s.io/api/core/v1"
    24  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    25  	"k8s.io/apimachinery/pkg/runtime"
    26  	"k8s.io/apiserver/pkg/admission"
    27  	"k8s.io/kubernetes/pkg/apis/core"
    28  )
    29  
    30  func makeSvc(externalIPs ...string) *core.Service {
    31  	svc := &core.Service{}
    32  	svc.Namespace = "test-ns"
    33  	svc.Name = "test-svc"
    34  	svc.Spec.ExternalIPs = externalIPs
    35  	return svc
    36  }
    37  
    38  func TestAdmission(t *testing.T) {
    39  	testCases := []struct {
    40  		name   string
    41  		newSvc *core.Service
    42  		oldSvc *core.Service
    43  		fail   bool
    44  	}{{
    45  		name:   "create: without externalIPs",
    46  		newSvc: makeSvc(),
    47  	}, {
    48  		name:   "create: with externalIPs",
    49  		newSvc: makeSvc("1.1.1.1"),
    50  		fail:   true,
    51  	}, {
    52  		name:   "update: same externalIPs",
    53  		newSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    54  		oldSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    55  	}, {
    56  		name:   "update: reorder externalIPs",
    57  		newSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    58  		oldSvc: makeSvc("2.2.2.2", "1.1.1.1"),
    59  	}, {
    60  		name:   "update: change externalIPs",
    61  		newSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    62  		oldSvc: makeSvc("1.1.1.1", "3.3.3.3"),
    63  		fail:   true,
    64  	}, {
    65  		name:   "update: add externalIPs",
    66  		newSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    67  		oldSvc: makeSvc("1.1.1.1"),
    68  		fail:   true,
    69  	}, {
    70  		name:   "update: erase externalIPs",
    71  		newSvc: makeSvc(),
    72  		oldSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    73  	}, {
    74  		name:   "update: reduce externalIPs from back",
    75  		newSvc: makeSvc("1.1.1.1"),
    76  		oldSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    77  	}, {
    78  		name:   "update: reduce externalIPs from front",
    79  		newSvc: makeSvc("2.2.2.2"),
    80  		oldSvc: makeSvc("1.1.1.1", "2.2.2.2"),
    81  	}}
    82  
    83  	for _, tc := range testCases {
    84  		t.Run(tc.name, func(t *testing.T) {
    85  			ctrl := newPlugin()
    86  
    87  			var op admission.Operation
    88  			var opt runtime.Object
    89  			if tc.oldSvc == nil {
    90  				op = admission.Create
    91  				opt = &metav1.CreateOptions{}
    92  			} else {
    93  				op = admission.Update
    94  				opt = &metav1.UpdateOptions{}
    95  			}
    96  
    97  			attrs := admission.NewAttributesRecord(
    98  				tc.newSvc, // new object
    99  				tc.oldSvc, // old object
   100  				core.Kind("Service").WithVersion("version"),
   101  				tc.newSvc.Namespace,
   102  				tc.newSvc.Name,
   103  				corev1.Resource("services").WithVersion("version"),
   104  				"", // subresource
   105  				op,
   106  				opt,
   107  				false, // dryRun
   108  				nil,   // userInfo
   109  			)
   110  
   111  			err := ctrl.Validate(context.TODO(), attrs, nil)
   112  			if err != nil && !tc.fail {
   113  				t.Errorf("Unexpected failure: %v", err)
   114  			}
   115  			if err == nil && tc.fail {
   116  				t.Errorf("Unexpected success")
   117  			}
   118  		})
   119  	}
   120  }
   121
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