owncloud / contacts

		$response = new JSONResponse();

		$response->setData(array('data' => $addressBook->getMetaData()));

		if (!is_null($lastModified)) {

			$response->addHeader('Cache-Control', 'private, must-revalidate');

			$response->setLastModified(\DateTime::createFromFormat('U', $lastModified) ?: null);

			$etag = md5($lastModified);

			$response->setETag($etag);

		}

		return $response;

	}

		$etag = null;

		$response = new JSONResponse();

		if (!is_null($lastModified)) {

			//$response->addHeader('Cache-Control', 'private, must-revalidate');

			$response->setLastModified(\DateTime::createFromFormat('U', $lastModified) ?: null);

			$etag = md5($lastModified);

			$response->setETag($etag);

		}

		if (!is_null($etag)

			&& $this->request->getHeader('If-None-Match') === '"'.$etag.'"')

		}

		$name = str_replace(' ', '_', $addressBook->getDisplayName()) . '.vcf';

		$response = new TextDownloadResponse($contacts, $name, 'text/directory');

		if(!is_null($lastModified)) {

			$response->addHeader('Cache-Control', 'private, must-revalidate');

			$response->setLastModified(\DateTime::createFromFormat('U', $lastModified) ?: null);

			$response->setETag(md5($lastModified));

		}

		return $response;

	}