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<?php
namespace MailPoet\Util;
if (!defined('ABSPATH')) exit;
use Exception;
use MailPoet\Entities\NewsletterEntity;
use MailPoet\Entities\SubscriberEntity;
use MailPoet\Newsletter\NewslettersRepository;
use MailPoet\Subscribers\SubscribersRepository;
class Security {
const HASH_LENGTH = 12;
const UNSUBSCRIBE_TOKEN_LENGTH = 15;
/** @var NewslettersRepository */
private $newslettersRepository;
/** @var SubscribersRepository */
private $subscribersRepository;
public function __construct(
NewslettersRepository $newslettersRepository,
SubscribersRepository $subscribersRepository
) {
$this->newslettersRepository = $newslettersRepository;
$this->subscribersRepository = $subscribersRepository;
}
/**
* Generate random lowercase alphanumeric string.
* 1 lowercase alphanumeric character = 6 bits (because log2(36) = 5.17)
* So 3 bytes = 4 characters
* @param int $length Minimal lenght is 5
* @return string
*/
public static function generateRandomString($length = 5): string {
$length = max(5, (int)$length);
$string = base_convert(
bin2hex(
random_bytes( // phpcs:ignore
(int)ceil(3 * $length / 4)
)
),
16,
36
);
$result = substr($string, 0, $length);
if (strlen($result) === $length) return $result;
// in very rare occasions we generate a shorter string when random_bytes generates something starting with 0 let's try again
return self::generateRandomString($length);
}
/**
* @param int $length Maximal length is 32
* @return string
*/
public static function generateHash($length = null) {
$length = ($length) ? $length : self::HASH_LENGTH;
$authKey = self::generateRandomString(64);
if (defined('AUTH_KEY')) {
$authKey = AUTH_KEY;
}
return substr(
hash_hmac('sha512', self::generateRandomString(64), $authKey),
0,
$length
);
}
static public function generateUnsubscribeToken($model) {
do {
$token = self::generateRandomString(self::UNSUBSCRIBE_TOKEN_LENGTH);
$found = $model::whereEqual('unsubscribe_token', $token)->count();
} while ($found > 0);
return $token;
}
public function generateUnsubscribeTokenByEntity($entity): string {
$repository = null;
if ($entity instanceof NewsletterEntity) {
$repository = $this->newslettersRepository;
} elseif ($entity instanceof SubscriberEntity) {
$repository = $this->subscribersRepository;
} else {
throw new Exception('Unsupported Entity type');
}
do {
$token = self::generateRandomString(self::UNSUBSCRIBE_TOKEN_LENGTH);
$found = count($repository->findBy(['unsubscribeToken' => $token]));
} while ($found > 0);
return $token;
}
}