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<?php |
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declare(strict_types=1); |
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namespace Enjoys\Forms\Elements; |
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use Enjoys\Forms\Exception\CsrfAttackDetected; |
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use Enjoys\Forms\Exception\ExceptionRule; |
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use Enjoys\Forms\Form; |
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use Enjoys\Forms\Rules; |
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use Enjoys\Session\Session; |
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/** |
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* Включает защиту от CSRF. |
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* Сross Site Request Forgery — «Подделка межсайтовых запросов», также известен как XSRF |
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*/ |
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class Csrf extends Hidden |
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{ |
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/** |
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* @throws ExceptionRule |
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* @throws \Exception |
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*/ |
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public function __construct(private Session $session) |
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{ |
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$csrfSecret = $this->getCsrfSecret(); |
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$token = $this->getCsrfToken($csrfSecret); |
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parent::__construct(Form::_TOKEN_CSRF_, $token); |
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$this->addRule( |
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Rules::CALLBACK, |
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'CSRF Attack detected', |
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function (string $key) { |
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/** @psalm-suppress PossiblyNullArgument, MixedArgument */ |
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if (password_verify($key, $this->getRequest()->getParsedBody()[Form::_TOKEN_CSRF_] ?? '')) { |
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return true; |
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} |
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throw new CsrfAttackDetected('CSRF Token is invalid'); |
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}, |
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$csrfSecret |
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); |
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} |
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public function prepare(): bool |
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{ |
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if (!in_array($this->getForm()?->getMethod(), ['POST', 'PUT', 'DELETE', 'PATCH'], true)) { |
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//удаляем элемент, если был заранее создан |
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//$this->getForm()->removeElement($this->getForm()->getElement(\Enjoys\Forms\Form::_TOKEN_CSRF_)); |
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$this->getForm()?->removeElement($this); |
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//возвращаем true, чтобы не добавлять элемент. |
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return true; |
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} |
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$this->unsetForm(); |
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return false; |
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} |
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/** |
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* @throws \Exception |
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*/ |
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private function getCsrfSecret(): string |
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{ |
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$secret = (string)$this->session->get('csrf_secret'); |
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if (empty($secret)) { |
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$secret = $this->generateSecret(); |
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} |
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return $secret; |
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} |
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public function getCsrfToken(string $secret): string |
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{ |
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return password_hash($secret, PASSWORD_DEFAULT); |
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} |
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/** |
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* @return string |
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* @throws \Exception |
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*/ |
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private function generateSecret(): string |
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{ |
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$secret = base64_encode(random_bytes(32)); |
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$this->session->set([ |
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'csrf_secret' => $secret |
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]); |
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return $secret; |
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} |
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} |
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