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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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/** |
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* Middleware to span protection using the honeypot technique. |
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*/ |
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class Honeypot |
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{ |
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use Utils\FormTrait; |
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const KEY_GENERATOR = 'HONEYPOT_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_name'; |
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/** |
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* @var string The honeypot class name |
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*/ |
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private $inputClass = 'hpt_input'; |
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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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* Set the field class. |
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* |
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* @param string $inputClass |
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* |
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* @return self |
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*/ |
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public function inputClass($inputClass) |
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{ |
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$this->inputClass = $inputClass; |
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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('Honeypot 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 $response->withStatus(403); |
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} |
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$generator = function () { |
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return '<input type="text" name="'.$this->inputName.'" class="'.$this->inputClass.'">'; |
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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 = $request->getParsedBody(); |
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return isset($data[$this->inputName]) && $data[$this->inputName] === ''; |
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} |
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} |
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oscarotero /
psr7-middlewares
