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package random
import (
"math/rand"
"os"
"time"
)
var (
PossibleNumbers = "0123456789"
PossibleLowerCase = "abcdefghijklmnopqrstuvwxyz"
PossibleUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
PossibleAlphaNum = PossibleNumbers + PossibleLowerCase + PossibleUpperCase
PossibleAlphaNumLower = PossibleNumbers + PossibleLowerCase
PossibleAlphaNumUpper = PossibleNumbers + PossibleUpperCase
)
var rnd = rand.New(rand.NewSource(time.Now().UnixNano() + int64(os.Getpid())))
func Numbers(length int) string { return String(PossibleNumbers, length) }
func AlphaNum(length int) string { return String(PossibleAlphaNum, length) }
func AlphaNumLower(length int) string { return String(PossibleAlphaNumLower, length) }
func AlphaNumUpper(length int) string { return String(PossibleAlphaNumUpper, length) }
func String(chooseFrom string, length int) (randomString string) {
cflen := len(chooseFrom)
bytes := make([]byte, length)
for i := range bytes {
bytes[i] = chooseFrom[rnd.Intn(cflen)]
}
return string(bytes)
}
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