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// Copyright 2015 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package utils
import (
"math/rand"
"sync"
"time"
)
// Can be used as a sane default argument for RandomString
var (
LowerAlpha = []rune("abcdefghijklmnopqrstuvwxyz")
UpperAlpha = []rune("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
Digits = []rune("0123456789")
)
var (
randomStringMu sync.Mutex
randomStringRand *rand.Rand
)
func init() {
randomStringRand = rand.New(
rand.NewSource(time.Now().UnixNano()),
)
}
// RandomString will return a string of length n that will only
// contain runes inside validRunes
func RandomString(n int, validRunes []rune) string {
randomStringMu.Lock()
defer randomStringMu.Unlock()
runes := make([]rune, n)
for i := range runes {
runes[i] = validRunes[randomStringRand.Intn(len(validRunes))]
}
return string(runes)
}
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