velocity-pay-springboot/src/main/java/zw/qantra/tm/exceptions/RestTemplateResponseErrorHandler.java

package zw.qantra.tm.exceptions;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.client.ResponseErrorHandler;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.Collectors;

@Component
public class RestTemplateResponseErrorHandler
        implements ResponseErrorHandler {
    private Logger logger = LoggerFactory.getLogger(this.getClass().toString());

    @Override
    public boolean hasError(ClientHttpResponse httpResponse)
            throws IOException {
        return (
                httpResponse.getStatusCode().is5xxServerError()
                        || httpResponse.getStatusCode().is4xxClientError());
    }

    @Override
    public void handleError(ClientHttpResponse httpResponse)
            throws IOException {

        logger.info("Rest error code: " + httpResponse.getStatusCode());

        if (httpResponse.getStatusCode()
                .is5xxServerError()) {
            // handle SERVER_ERROR
            logger.info("Server Error");
        } else if (httpResponse.getStatusCode().is4xxClientError()) {
            // handle CLIENT_ERROR
            logger.info("Client Error");
            BufferedReader reader = new BufferedReader(new InputStreamReader(httpResponse.getBody()));
            String httpBodyResponse = reader.lines().collect(Collectors.joining(""));

            throw new RestException(httpBodyResponse, "Client Error: " + httpResponse.getStatusCode());
        }
    }
}