bodyFieldValidator<T extends Body> function

Middleware bodyFieldValidator<T extends Body>(String fieldName, bool validator(Object? value))

bodyFieldValidator run validator on the field fieldName if validator failed return BadRequest response

Implementation

Middleware bodyFieldValidator<T extends Body>(
    String fieldName, bool Function(Object? value) validator) {
  return (handler) {
    return (request) {
      Response? checkItem(Map<String, dynamic> item) {
        final value = item[fieldName] as String;
        if (!validator(value)) {
          final bodyResponse = BadRequest(
            'about:blank',
            'Validator doesn\'t accept this value',
            'Field \'$fieldName\' with value \'$value\' is not authorized by this validator',
            400,
            request.requestedUri.path,
            field: fieldName,
          );
          return generateResponse(request, bodyResponse);
        }
        return null;
      }

      final body = request.get<T>();
      final response = _checkData(body.data, checkItem);
      if (response != null) {
        return response;
      }
      return handler(request);
    };
  };
}