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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Utils; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use RuntimeException; |
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use Exception; |
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/** |
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* Middleware to span protection using the timestamp value in forms. |
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*/ |
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class FormTimestamp |
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{ |
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use Utils\FormTrait; |
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use Utils\CryptTrait; |
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const KEY_GENERATOR = 'FORM_TIMESTAMP_GENERATOR'; |
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/** |
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* @var string The honeypot input name |
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*/ |
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private $inputName = 'hpt_time'; |
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/** |
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* @var int Minimum seconds to determine whether the request is a bot |
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*/ |
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private $min = 3; |
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/** |
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* @var int Max seconds to expire the form. Zero to do not expire |
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*/ |
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private $max = 0; |
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/** |
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* Returns a callable to generate the inputs. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return callable|null |
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*/ |
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public static function getGenerator(ServerRequestInterface $request) |
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{ |
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return Middleware::getAttribute($request, self::KEY_GENERATOR); |
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} |
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/** |
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* Set the field name. |
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* |
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* @param string $inputName |
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* |
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* @return self |
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*/ |
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public function inputName($inputName) |
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{ |
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$this->inputName = $inputName; |
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return $this; |
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} |
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/** |
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* Minimum time required. |
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* |
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* @param int $seconds |
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* |
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* @return self |
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*/ |
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public function min($seconds) |
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{ |
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$this->min = $seconds; |
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return $this; |
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} |
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/** |
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* Max time before expire the form. |
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* |
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* @param int $seconds |
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* |
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* @return self |
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*/ |
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public function max($seconds) |
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{ |
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$this->max = $seconds; |
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return $this; |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param ServerRequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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if (!Middleware::hasAttribute($request, FormatNegotiator::KEY)) { |
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throw new RuntimeException('FormTimestamp middleware needs FormatNegotiator executed before'); |
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} |
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if (FormatNegotiator::getFormat($request) !== 'html') { |
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return $next($request, $response); |
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} |
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if (Utils\Helpers::isPost($request) && !$this->isValid($request)) { |
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return $response->withStatus(403); |
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} |
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$value = $this->encrypt(time()); |
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$generator = function () use ($value) { |
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return '<input type="hidden" name="'.$this->inputName.'" value="'.$value.'">'; |
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}; |
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$response = $next($request, $response); |
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return $this->insertIntoPostForms($response, function ($match) use ($generator) { |
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return $match[0].$generator(); |
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}); |
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} |
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/** |
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* Check whether the request is valid. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return bool |
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*/ |
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private function isValid(ServerRequestInterface $request) |
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{ |
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$data = $request->getParsedBody(); |
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//value does not exists |
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if (empty($data[$this->inputName])) { |
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return false; |
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} |
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try { |
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$time = $this->decrypt($data[$this->inputName]); |
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} catch (Exception $e) { |
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return false; |
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} |
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//value is not valid |
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if (!is_numeric($time)) { |
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return false; |
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} |
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$now = time(); |
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//sent from future |
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if ($now < $time) { |
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return false; |
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} |
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$diff = $now - $time; |
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//check min |
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if ($diff < $this->min) { |
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return false; |
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} |
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//check max |
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if ($this->max && $diff > $this->max) { |
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return false; |
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} |
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return true; |
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} |
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} |
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oscarotero /
psr7-middlewares
