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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\Position; |
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use Stadly\PasswordPolice\FormerPassword; |
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use Stadly\PasswordPolice\Password; |
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use Stadly\PasswordPolice\Policy; |
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use Stadly\PasswordPolice\HashFunction\HashFunctionInterface; |
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final class NoReuse implements RuleInterface |
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{ |
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/** |
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* @var HashFunctionInterface Hash function. |
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*/ |
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private $hashFunction; |
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/** |
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* @var Position[] Rule constraints. |
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*/ |
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private $constraints; |
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/** |
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* @param HashFunctionInterface $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( |
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HashFunctionInterface $hashFunction, |
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?int $count = null, |
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int $first = 0, |
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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 Position($first, $count, $weight); |
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StableSort::usort($this->constraints, function (Position $a, Position $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 HashFunctionInterface Hash function. |
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*/ |
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public function getHashFunction(): HashFunctionInterface |
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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 $password Password to check. |
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* @return bool Whether the password is in compliance with the rule. |
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*/ |
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public function test($password): bool |
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{ |
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$positions = $this->getPositions($password); |
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$constraint = $this->getViolation(...$positions); |
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return $constraint === null; |
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} |
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/** |
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* Enforce that a password is in compliance with the rule. |
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* |
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* @param Password|string $password Password that must adhere to the rule. |
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* @throws RuleException If the password does not adhrere to the rule. |
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*/ |
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public function enforce($password): void |
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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 ($constraint !== null) { |
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throw new RuleException($this, $this->getMessage($constraint)); |
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} |
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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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* @return Position|null Constraint violated by the position. |
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*/ |
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private function getViolation(int... $positions): ?Position |
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{ |
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foreach ($this->constraints as $constraint) { |
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foreach ($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 Position $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(Position $constraint): string |
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{ |
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$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
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