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<?php |
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declare(strict_types=1); |
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namespace Stadly\PasswordPolice\Rule; |
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use InvalidArgumentException; |
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use StableSort\StableSort; |
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use Stadly\PasswordPolice\Constraint\Count; |
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use Stadly\PasswordPolice\Password; |
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use Stadly\PasswordPolice\ValidationError; |
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abstract class CharacterClass implements RuleInterface |
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{ |
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/** |
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* @var string Characters matched by the rule. |
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*/ |
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protected $characters; |
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/** |
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* @var Count[] Rule constraints. |
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*/ |
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private $constraints; |
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/** |
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* @param string $characters Characters matched by the rule. |
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* @param int $min Minimum number of characters matching the rule. |
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* @param int|null $max Maximum number of characters matching the rule. |
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* @param int $weight Constraint weight. |
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*/ |
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public function __construct(string $characters, int $min = 1, ?int $max = null, int $weight = 1) |
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{ |
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if ($characters === '') { |
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throw new InvalidArgumentException('At least one character must be specified.'); |
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} |
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$this->characters = $characters; |
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$this->addConstraint($min, $max, $weight); |
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} |
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/** |
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* @param int $min Minimum number of characters matching the rule. |
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* @param int|null $max Maximum number of characters matching the rule. |
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* @param int $weight Constraint weight. |
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* @return $this |
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*/ |
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public function addConstraint(int $min = 1, ?int $max = null, int $weight = 1): self |
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{ |
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$this->constraints[] = new Count($min, $max, $weight); |
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StableSort::usort($this->constraints, function (Count $a, Count $b): int { |
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return $b->getWeight() <=> $a->getWeight(); |
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}); |
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return $this; |
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} |
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/** |
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* @return string Characters matched by the rule. |
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*/ |
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public function getCharacters(): string |
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{ |
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return $this->characters; |
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} |
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/** |
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* Check whether a password is in compliance with the rule. |
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* |
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* @param Password|string $password Password to check. |
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* @param int|null $weight Don't consider constraints with lower weights. |
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* @return bool Whether the password is in compliance with the rule. |
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*/ |
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public function test($password, ?int $weight = 1): bool |
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{ |
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$count = $this->getCount((string)$password); |
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$constraint = $this->getViolation($count, $weight); |
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return $constraint === null; |
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} |
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/** |
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* Validate that a password is in compliance with the rule. |
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* |
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* @param Password|string $password Password to validate. |
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* @return ValidationError|null Validation error describing why the password is not in compliance with the rule. |
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*/ |
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public function validate($password): ?ValidationError |
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{ |
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$count = $this->getCount((string)$password); |
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$constraint = $this->getViolation($count); |
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if ($constraint !== null) { |
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return new ValidationError($this, $constraint->getWeight(), $this->getMessage($constraint, $count)); |
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} |
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return null; |
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} |
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/** |
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* @param int $count Number of characters matching the rule. |
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* @param int|null $weight Don't consider constraints with lower weights. |
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* @return Count|null Constraint violated by the count. |
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*/ |
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private function getViolation(int $count, ?int $weight = null): ?Count |
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{ |
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foreach ($this->constraints as $constraint) { |
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if ($weight !== null && $constraint->getWeight() < $weight) { |
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continue; |
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} |
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if (!$constraint->test($count)) { |
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return $constraint; |
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} |
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} |
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return null; |
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} |
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/** |
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* @param string $password Password to count characters in. |
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* @return int Number of characters matching the rule. |
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*/ |
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private function getCount(string $password): int |
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{ |
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$escapedCharacters = preg_quote($this->characters); |
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$count = preg_match_all('{['.$escapedCharacters.']}u', $password); |
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assert(false !== $count); |
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return $count; |
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} |
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/** |
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* @param Count $constraint Constraint that is violated. |
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* @param int $count Count that violates the constraint. |
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* @return string Message explaining the violation. |
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*/ |
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abstract protected function getMessage(Count $constraint, int $count): string; |
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} |
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Stadly /
PasswordPolice
