extract method

Implementation

@override
Future<Result<String, Rejection>> extract(Request request) async {
  final fromHeader = RequestParts.of(request).headers[header.toLowerCase()];
  if (fromHeader != null && fromHeader.isNotEmpty) return Ok(fromHeader);

  if (allowQuery) {
    final fromQuery = request.url.queryParameters[query];
    if (fromQuery != null && fromQuery.isNotEmpty) return Ok(fromQuery);
  }

  return Err(
    Rejection.unauthorized(
      'expected an API key in the $header header',
      challenge: 'ApiKey',
    ),
  );
}