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https://github.com/vmware-tanzu/velero.git
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4e12b08953
Velero should handle cases when the label length exceeds 63 characters. - if the length of the backup/restore name is <= 63 characters, use it as the value of the label - if it's > 63 characters, take the SHA256 hash of the name. the value of the label will be the first 57 characters of the backup/restore name plus the first six characters of the SHA256 hash. Fixes heptio#1021 Signed-off-by: Anshul Chandra <anshulc@vmware.com>
46 lines
1.7 KiB
Go
46 lines
1.7 KiB
Go
/*
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Copyright 2019 the Velero contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package label
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import (
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"crypto/sha256"
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"fmt"
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"k8s.io/apimachinery/pkg/util/validation"
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)
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// GetValidName converts an input string to valid kubernetes label string in accordance to rfc1035 DNS Label spec
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// (https://github.com/kubernetes/community/blob/master/contributors/design-proposals/architecture/identifiers.md)
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// Length of the label is adjusted basis the DNS1035LabelMaxLength (defined at k8s.io/apimachinery/pkg/util/validation)
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// If length exceeds, we trim the label name to contain only max allowed characters
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// Additionally, the last 6 characters of the label name are replaced by the first 6 characters of the sha256 of original label
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func GetValidName(label string) string {
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if len(label) <= validation.DNS1035LabelMaxLength {
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return label
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}
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sha := sha256.Sum256([]byte(label))
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strSha := fmt.Sprintf("%x", sha)
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charsFromLabel := validation.DNS1035LabelMaxLength - 6
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if charsFromLabel < 0 {
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// Derive the label name from sha hash in case the DNS1035LabelMaxLength is less than 6
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return string(strSha[validation.DNS1035LabelMaxLength])
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}
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return label[:charsFromLabel] + strSha[:6]
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}
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