mirror of
https://github.com/kubernetes-sigs/external-dns.git
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31 lines
1.1 KiB
Go
31 lines
1.1 KiB
Go
/*
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Copyright 2025 The Kubernetes Authors.
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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 informers
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import (
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"crypto/sha1"
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"encoding/hex"
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)
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// ToSHA returns the SHA1 hash of the input string as a hex string.
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// Using a SHA1 hash of the label selector string (as in ToSHA(labels.Set(selector).String())) is useful:
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// - It provides a consistent and compact representation of the selector.
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// - It allows for efficient indexing and lookup in Kubernetes informers.
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// - It avoids issues with long label selector strings that could exceed index length limits.
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func ToSHA(s string) string {
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h := sha1.New()
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h.Write([]byte(s))
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return hex.EncodeToString(h.Sum(nil))
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}
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