private static HttpClient createV4SigningClient()

in src/main/java/software/aws/neptune/sparql/SparqlQueryExecutor.java [137:175]
35 lines of code
4 McCabe index (conditional complexity)

    private static HttpClient createV4SigningClient(final SparqlConnectionProperties properties) throws SQLException {
        final AWSCredentialsProvider awsCredentialsProvider = new DefaultAWSCredentialsProviderChain();
        final NeptuneApacheHttpSigV4Signer v4Signer;
        final HttpClient v4SigningClient;

        try {
            v4Signer = new NeptuneApacheHttpSigV4Signer(properties.getServiceRegion(), awsCredentialsProvider);
            v4SigningClient =
                    HttpClientBuilder.create().addInterceptorLast(new HttpRequestInterceptor() {

                        @SneakyThrows
                        @Override
                        public void process(final HttpRequest req, final HttpContext ctx) {
                            if (req instanceof HttpUriRequest) {
                                final HttpUriRequest httpUriReq = (HttpUriRequest) req;
                                try {
                                    v4Signer.signRequest(httpUriReq);
                                } catch (final NeptuneSigV4SignerException e) {
                                    throw SqlError.createSQLException(LOGGER,
                                            SqlState.INVALID_AUTHORIZATION_SPECIFICATION,
                                            SqlError.CONN_FAILED, e);
                                }
                            } else {
                                throw SqlError.createSQLException(LOGGER,
                                        SqlState.INVALID_AUTHORIZATION_SPECIFICATION,
                                        SqlError.UNSUPPORTED_REQUEST, "Not an HttpUriRequest");
                            }
                        }

                    }).build();

        } catch (final NeptuneSigV4SignerException e) {
            throw SqlError.createSQLException(
                    LOGGER,
                    SqlState.INVALID_AUTHORIZATION_SPECIFICATION,
                    SqlError.CONN_FAILED, e);
        }
        return v4SigningClient;
    }