92 lines
3.2 KiB
PHP
92 lines
3.2 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Validator\Constraints;
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use Symfony\Component\Validator\Constraint;
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use Symfony\Component\Validator\ConstraintValidator;
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use Symfony\Component\Validator\Exception\UnexpectedTypeException;
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use Symfony\Component\Validator\Exception\UnexpectedValueException;
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final class PasswordStrengthValidator extends ConstraintValidator
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{
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/**
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* @param (\Closure(string):PasswordStrength::STRENGTH_*)|null $passwordStrengthEstimator
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*/
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public function __construct(
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private readonly ?\Closure $passwordStrengthEstimator = null,
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) {
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}
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public function validate(#[\SensitiveParameter] mixed $value, Constraint $constraint): void
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{
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if (!$constraint instanceof PasswordStrength) {
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throw new UnexpectedTypeException($constraint, PasswordStrength::class);
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}
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if (null === $value) {
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return;
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}
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if (!\is_string($value) && !$value instanceof \Stringable) {
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throw new UnexpectedValueException($value, 'string');
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}
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$passwordStrengthEstimator = $this->passwordStrengthEstimator ?? self::estimateStrength(...);
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$strength = $passwordStrengthEstimator((string) $value);
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if ($strength < $constraint->minScore) {
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$this->context->buildViolation($constraint->message)
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->setCode(PasswordStrength::PASSWORD_STRENGTH_ERROR)
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->setParameter('{{ strength }}', $strength)
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->addViolation();
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}
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}
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/**
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* Returns the estimated strength of a password.
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*
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* The higher the value, the stronger the password.
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*
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* @return PasswordStrength::STRENGTH_*
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*/
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private static function estimateStrength(#[\SensitiveParameter] string $password): int
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{
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if (!$length = \strlen($password)) {
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return PasswordStrength::STRENGTH_VERY_WEAK;
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}
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$password = count_chars($password, 1);
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$chars = \count($password);
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$control = $digit = $upper = $lower = $symbol = $other = 0;
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foreach ($password as $chr => $count) {
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match (true) {
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$chr < 32 || 127 === $chr => $control = 33,
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48 <= $chr && $chr <= 57 => $digit = 10,
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65 <= $chr && $chr <= 90 => $upper = 26,
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97 <= $chr && $chr <= 122 => $lower = 26,
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128 <= $chr => $other = 128,
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default => $symbol = 33,
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};
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}
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$pool = $lower + $upper + $digit + $symbol + $control + $other;
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$entropy = $chars * log($pool, 2) + ($length - $chars) * log($chars, 2);
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return match (true) {
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$entropy >= 120 => PasswordStrength::STRENGTH_VERY_STRONG,
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$entropy >= 100 => PasswordStrength::STRENGTH_STRONG,
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$entropy >= 80 => PasswordStrength::STRENGTH_MEDIUM,
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$entropy >= 60 => PasswordStrength::STRENGTH_WEAK,
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default => PasswordStrength::STRENGTH_VERY_WEAK,
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};
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}
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}
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