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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 StableSort\StableSort; |
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use Stadly\PasswordPolice\Constraint\PositionConstraint; |
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use Stadly\PasswordPolice\HashFunction; |
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use Stadly\PasswordPolice\Password; |
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use Stadly\PasswordPolice\Policy; |
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use Stadly\PasswordPolice\Rule; |
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use Stadly\PasswordPolice\ValidationError; |
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final class NoReuseRule implements Rule |
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{ |
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/** |
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* @var HashFunction Hash function. |
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*/ |
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private $hashFunction; |
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/** |
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* @var PositionConstraint[] Rule constraints. |
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*/ |
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private $constraints; |
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/** |
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* @param HashFunction $hashFunction Hash function to use when comparing passwords. |
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* @param int|null $count Number of former passwords to consider. |
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* @param int $first First former password to consider. |
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* @param int $weight Constraint weight. |
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*/ |
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public function __construct(HashFunction $hashFunction, ?int $count = null, int $first = 0, int $weight = 1) |
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{ |
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$this->hashFunction = $hashFunction; |
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$this->addConstraint($count, $first, $weight); |
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} |
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/** |
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* @param int|null $count Number of former passwords to consider. |
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* @param int $first First former password to consider. |
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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 $count = null, int $first = 0, int $weight = 1): self |
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{ |
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$this->constraints[] = new PositionConstraint($first, $count, $weight); |
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StableSort::usort($this->constraints, static function (PositionConstraint $a, PositionConstraint $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 HashFunction Hash function. |
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*/ |
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public function getHashFunction(): HashFunction |
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{ |
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return $this->hashFunction; |
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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 $weight = 1): bool |
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{ |
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$positions = $this->getPositions($password); |
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$constraint = $this->getViolation($positions, $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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$positions = $this->getPositions($password); |
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$constraint = $this->getViolation($positions); |
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if ($constraint !== null) { |
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return new ValidationError( |
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$this->getMessage($constraint), |
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$password, |
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$this, |
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$constraint->getWeight() |
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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 int[] $positions Positions of former passwords matching the password. |
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* @param int|null $weight Don't consider constraints with lower weights. |
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* @return PositionConstraint|null Constraint violated by the position. |
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*/ |
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private function getViolation(array $positions, ?int $weight = null): ?PositionConstraint |
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{ |
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foreach ($this->constraints as $constraint) { |
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if ($weight !== null && $constraint->getWeight() < $weight) { |
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continue; |
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} |
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foreach ($positions as $position) { |
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if ($constraint->test($position)) { |
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return $constraint; |
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} |
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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 Password|string $password Password to compare with former passwords. |
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* @return int[] Positions of former passwords matching the password. |
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*/ |
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private function getPositions($password): array |
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{ |
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$positions = []; |
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if ($password instanceof Password) { |
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$position = 0; |
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foreach ($password->getFormerPasswords() as $formerPassword) { |
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if ($this->hashFunction->compare((string)$password, (string)$formerPassword)) { |
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$positions[] = $position; |
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} |
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++$position; |
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} |
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} |
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return $positions; |
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} |
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/** |
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* @param PositionConstraint $constraint Constraint that is violated. |
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* @return string Message explaining the violation. |
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*/ |
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private function getMessage(PositionConstraint $constraint): string |
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{ |
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$translator = Policy::getTranslator(); |
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return $translator->trans( |
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'Cannot reuse former passwords.' |
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); |
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} |
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} |
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Stadly /
PasswordPolice
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.