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/*
*
* Copyright (c) 2022. Deutsche Telekom AG
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
*
*
*/
package org.onap.portalng.history.configuration;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.onap.portalng.history.exception.ProblemException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import org.zalando.problem.Problem;
import org.zalando.problem.Status;
import reactor.core.publisher.Mono;
@Component
public class Errorhandler implements ErrorWebExceptionHandler {
@Autowired
ObjectMapper objectMapper;
/**
* Override the handle methode to implement custom error handling
* Set response status code to BAD REQUEST, set header content-type and fill the body with the Problem object along the API model
*/
@Override
public Mono<Void> handle(ServerWebExchange exchange, Throwable ex) {
ServerHttpResponse httpResponse = exchange.getResponse();
setResponseStatus(httpResponse, ex);
httpResponse.getHeaders().add("Content-Type", "application/problem+json");
return httpResponse.writeWith(Mono.fromSupplier(() -> {
DataBufferFactory bufferFactory = httpResponse.bufferFactory();
try {
return
(httpResponse.getStatusCode() == HttpStatus.INTERNAL_SERVER_ERROR)
? httpResponse.bufferFactory().wrap(objectMapper.writeValueAsBytes(setProblemException(httpResponse, ex.getMessage())))
: httpResponse.bufferFactory().wrap(objectMapper.writeValueAsBytes(ex));
} catch (JsonProcessingException e) {
return bufferFactory.wrap(new byte[0]);
}
}));
}
/**
* Set the response status
* @param httpResponse response which status code should be set
* @param ex throwable exception to identify the Problem class
*/
private void setResponseStatus(ServerHttpResponse httpResponse, Throwable ex) {
if (ex instanceof Problem) {
httpResponse.setStatusCode(HttpStatus.BAD_REQUEST);
} else {
httpResponse.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
}
}
/**
* Build a problem exception and set the response status code to BAD REQUEST for every response
* @param httpResponse response which status code should be set
* @param message for the detail of the problem exception
* @return problem exception instance
*/
private ProblemException setProblemException(ServerHttpResponse httpResponse, String message){
httpResponse.setStatusCode(HttpStatus.BAD_REQUEST);
return ProblemException.builder()
.status(Status.INTERNAL_SERVER_ERROR)
.title(Status.INTERNAL_SERVER_ERROR.getReasonPhrase())
.detail(message)
.build();
}
}
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