Psr7Middlewares\Middleware\FormTimestamp::__invoke PHP Метод

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next)
    {
        if (Utils\Helpers::getMimeType($response) !== 'text/html') {
            return $next($request, $response);
        }
        if (Utils\Helpers::isPost($request) && !$this->isValid($request)) {
            return $response->withStatus(403);
        }
        $value = $this->encrypt(time());
        $generator = function () use($value) {
            return '<input type="hidden" name="' . $this->inputName . '" value="' . $value . '">';
        };
        if (!$this->autoInsert) {
            $request = self::setAttribute($request, self::KEY_GENERATOR, $generator);
            return $next($request, $response);
        }
        $response = $next($request, $response);
        return $this->insertIntoPostForms($response, function ($match) use($generator) {
            return $match[0] . $generator();
        });
    }