password.go

package util

import (
	"crypto/rand"
	"math/big"
)

const defaultPasswordLength = 20

// GeneratePassword a random password
func GeneratePassword() string {
	return GeneratePasswordWithLength(defaultPasswordLength)
}

// GeneratePasswordWithLength a random password with the given length
func GeneratePasswordWithLength(length int) string {
	var letterRunes = []rune("abcdefghijklmnopqrstuvwxyz0123456789")
	lengthLetterRunes := big.NewInt(int64(len(letterRunes)))
	passwordRunes := make([]rune, length)

	for i := range passwordRunes {
		index, err := rand.Int(rand.Reader, lengthLetterRunes)
		if err != nil {
			panic(err)
		}

		passwordRunes[i] = letterRunes[index.Int64()]
	}

	return string(passwordRunes)
}