private function getAuthenticationHeaders(HttpRequest $request) {
		$timestamp = time();
		$version = '1';
		$path = $request->getPath();
		$securedData = $version . '|' . $this->userId . '|' . $timestamp . '|' . $request->getMethod() . '|' . $path;

		$headers = array();
		$headers['x-mac-version'] = $version;
		$headers['x-mac-userid'] = $this->userId;
		$headers['x-mac-timestamp'] = $timestamp;
		$headers['x-mac-value'] = $this->calculateHmac($securedData);
		return $headers;
	}