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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| Copyright 2021 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 labels contains functions to validate and compare values used in Kubernetes labels. | ||
| package labels | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "hash/fnv" | ||
|
|
||
| "k8s.io/apimachinery/pkg/util/validation" | ||
| ) | ||
|
|
||
| // MustFormatValue returns the passed inputLabelValue if it meets the standards for a Kubernetes label value. | ||
| // If the name is not a valid label value this function returns a hash which meets the requirements. | ||
| func MustFormatValue(str string) string { | ||
| // a valid Kubernetes label value must: | ||
| // - be less than 64 characters long. | ||
| // - be an empty string OR consist of alphanumeric characters, '-', '_' or '.'. | ||
| // - start and end with an alphanumeric character | ||
| if len(validation.IsValidLabelValue(str)) == 0 { | ||
| return str | ||
| } | ||
| hasher := fnv.New32a() | ||
| _, err := hasher.Write([]byte(str)) | ||
| if err != nil { | ||
| // At time of writing the implementation of fnv's Write function can never return an error. | ||
| // If this changes in a future go version this function will panic. | ||
| panic(err) | ||
| } | ||
| return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(hasher.Sum(nil)) | ||
| } | ||
|
|
||
| // MustEqualValue returns true if the actualLabelValue equals either the inputLabelValue or the hashed | ||
| // value of the inputLabelValue. | ||
| func MustEqualValue(str, labelValue string) bool { | ||
| expectedLabelValue := MustFormatValue(str) | ||
| if labelValue == expectedLabelValue { | ||
| return true | ||
| } | ||
| hasher := fnv.New32a() | ||
| // The Write function should never return an error. | ||
| _, err := hasher.Write([]byte(labelValue)) | ||
| if err != nil { | ||
| // At time of writing the implementation of fnv's Write function can never return an error. | ||
| // If this changes in a future go version this function will panic. | ||
| panic(err) | ||
| } | ||
| return expectedLabelValue == base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(hasher.Sum(nil)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| Copyright 2021 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 labels | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/onsi/gomega" | ||
| ) | ||
|
|
||
| func TestNameLabelValue(t *testing.T) { | ||
| g := gomega.NewWithT(t) | ||
| tests := []struct { | ||
| name string | ||
| machineSetName string | ||
| want string | ||
| }{ | ||
| { | ||
| name: "return the name if it's less than 63 characters", | ||
| machineSetName: "machineSetName", | ||
| want: "machineSetName", | ||
| }, | ||
| { | ||
| name: "return for a name with more than 63 characters", | ||
| machineSetName: "machineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetName", | ||
| want: "FR_ghQ", | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| got := MustFormatValue(tt.machineSetName) | ||
| g.Expect(got).To(gomega.Equal(tt.want)) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| func TestMustMatchLabelValueForName(t *testing.T) { | ||
| g := gomega.NewWithT(t) | ||
| tests := []struct { | ||
| name string | ||
| machineSetName string | ||
| labelValue string | ||
| want bool | ||
| }{ | ||
| { | ||
| name: "match labels when MachineSet name is short", | ||
| machineSetName: "ms1", | ||
| labelValue: "ms1", | ||
| want: true, | ||
| }, | ||
| { | ||
| name: "don't match different labels when MachineSet name is short", | ||
| machineSetName: "ms1", | ||
| labelValue: "notMS1", | ||
| want: false, | ||
| }, | ||
| { | ||
| name: "don't match labels when MachineSet name is long", | ||
| machineSetName: "machineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetName", | ||
| labelValue: "Nx4RdE", | ||
| want: false, | ||
| }, | ||
| { | ||
| name: "match labels when MachineSet name is long", | ||
| machineSetName: "machineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetNamemachineSetName", | ||
| labelValue: "FR_ghQ", | ||
| want: true, | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| got := MustEqualValue(tt.machineSetName, tt.labelValue) | ||
| g.Expect(got).To(gomega.Equal(tt.want)) | ||
| }) | ||
| } | ||
| } |