decodeJson<BodyType, InnerType> method

FutureOr<Response> decodeJson<BodyType, InnerType>(Response response)

Implementation

FutureOr<Response> decodeJson<BodyType, InnerType>(Response response) async {
  final List<String> supportedContentTypes = [jsonHeaders, jsonApiHeaders];

  final String? contentType = response.headers[contentTypeKey];
  var body = response.body;

  if (supportedContentTypes.contains(contentType)) {
    // If we're decoding JSON, there's some ambiguity in https://tools.ietf.org/html/rfc2616
    // about what encoding should be used if the content-type doesn't contain a 'charset'
    // parameter. See https://github.com/dart-lang/http/issues/186. In a nutshell, without
    // an explicit charset, the Dart http library will fall back to using ISO-8859-1, however,
    // https://tools.ietf.org/html/rfc8259 says that JSON must be encoded using UTF-8. So,
    // we're going to explicitly decode using UTF-8... if we don't do this, then we can easily
    // end up with our JSON string containing incorrectly decoded characters.
    body = utf8.decode(response.bodyBytes);
  }

  body = await tryDecodeJson(body);
  if (isTypeOf<BodyType, Iterable<InnerType>>()) {
    body = body.cast<InnerType>();
  } else if (isTypeOf<BodyType, Map<String, InnerType>>()) {
    body = body.cast<String, InnerType>();
  }

  return response.copyWith<BodyType>(body: body);
}