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	public function downloadFile($source, $fileName){
		$httpResponse = $this->context->getService('httpResponse');
		$httpResponse->setHeader('Pragma', "public");
		$httpResponse->setHeader('Expires', 0);
		$httpResponse->setHeader('Cache-Control', "must-revalidate, post-check=0, pre-check=0");
		$httpResponse->setHeader('Content-Transfer-Encoding', "binary");
		$httpResponse->setHeader('Content-Description', "File Transfer");
		$httpResponse->setHeader('Content-Length', filesize($source));
		$this->sendResponse(new FileResponse($source, $fileName));
	}
	
	
		public function handleQrCodeDownload($hash, $id)
	{
		$user = $this->model->find($id);

		if ($hash !== sha1($user->id . $user->slug))
		{
			$this->error();
		}

		// lepsi cesta k souboru? http://forum.nette.org/cs/21269-fileresponse-soubor-neexistuje#p145741
		$userWebalize = Nette\Utils\Strings::webalize($user->firstname . '-' . $user->lastname);
		$response = new Nette\Application\Responses\FileResponse(WWW_DIR.'/storage/images/200x200/'.$hash.'.png', 'qr-'.$userWebalize.'.png');
		$this->sendResponse($response);
 	}
 	
 	
 	
 	// https://forum.nette.org/cs/21269-fileresponse-soubor-neexistuje#p145741