mirror of https://github.com/knative/caching.git
43 lines
1.3 KiB
Go
43 lines
1.3 KiB
Go
/*
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Copyright 2020 The Knative 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 configmap
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import (
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"fmt"
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"hash/crc32"
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"regexp"
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"strings"
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)
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const (
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// ExampleKey signifies a given example configuration in a ConfigMap.
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ExampleKey = "_example"
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// ExampleChecksumAnnotation is the annotation that stores the computed checksum.
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ExampleChecksumAnnotation = "knative.dev/example-checksum"
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)
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// Allows for normalizing by collapsing newlines.
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var sequentialNewlines = regexp.MustCompile("(?:\r?\n)+")
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// Checksum generates a checksum for the example value to be compared against
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// a respective annotation.
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// Leading and trailing spaces are ignored.
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func Checksum(value string) string {
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return fmt.Sprintf("%08x", crc32.ChecksumIEEE([]byte(sequentialNewlines.ReplaceAllString(strings.TrimSpace(value), `\n`))))
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}
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