forked from kubernetes-retired/go-open-service-broker-client
/
uuid.go
38 lines (30 loc) · 1.08 KB
/
uuid.go
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/*
Copyright 2019 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 generator
import (
"fmt"
)
// IDFrom generates a UUID according to RFC 4122 based off a seed.
func IDFrom(seed string) string {
uuid := make([]byte, 16)
// Push the seed into the UUID.
seedBytes := []byte(seed)
for i := 0; i < 16; i++ {
uuid[i] = seedBytes[i%len(seedBytes)]
}
// variant bits; see section 4.1.1
uuid[8] = uuid[8]&^0xc0 | 0x80
// version 4 (pseudo-random); see section 4.1.3
uuid[6] = uuid[6]&^0xf0 | 0x40
return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:])
}