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package utils
import (
"crypto/rand"
"encoding/base64"
"errors"
"strconv"
"strings"
"time"
)
func GenerateRandomString(len int) (string, error) {
bin := make([]byte, len)
_, err := rand.Read(bin)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(bin), nil
}
func ParseNumber(s string) (int64, error) {
s = strings.TrimSpace(s)
if len(s) == 0 {
s = "0"
}
return strconv.ParseInt(s, 10, 64)
}
func ParseDuration(value string) (time.Duration, error) {
const nullDuration = time.Duration(0)
if len(value) == 0 {
return nullDuration, errors.New("Empty duration string")
}
var unit time.Duration
switch value[len(value)-1] {
case 's':
unit = time.Second
case 'm':
unit = time.Minute
case 'h':
unit = time.Hour
case 'd':
unit = time.Duration(24) * time.Hour
case 'w':
unit = time.Duration(24*7) * time.Hour
default:
return nullDuration, errors.New("Invalid duration format")
}
amount, err := strconv.ParseInt(value[0:len(value)-1], 10, 64)
if err != nil || amount < 0 {
return nullDuration, errors.New("Invalid duration value")
}
return time.Duration(amount) * unit, nil
}
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