package security

import (
	"crypto/rand"
)

// RandomString generates a random string of specified length.
//
// The generated string is cryptographically random and matches
// [A-Za-z0-9]+ (aka. it's transparent to URL-encoding).
func RandomString(length int) string {
	const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

	bytes := make([]byte, length)
	rand.Read(bytes)
	for i, b := range bytes {
		bytes[i] = alphabet[b%byte(len(alphabet))]
	}

	return string(bytes)
}