/*
* Copyright 2002-2016 the original author or authors.
*
* 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.
*/
package org.springframework.web.reactive.result.method.annotation;
import java.util.List;
import reactor.core.publisher.Mono;
import org.springframework.core.MethodParameter;
import org.springframework.core.ResolvableType;
import org.springframework.core.convert.ConversionService;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.RequestEntity;
import org.springframework.http.converter.reactive.HttpMessageConverter;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.ui.ModelMap;
import org.springframework.validation.Validator;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolver;
import org.springframework.web.server.ServerWebExchange;
/**
* Resolves method arguments of type {@link HttpEntity} or {@link RequestEntity}
* by reading the body of the request through a compatible
* {@code HttpMessageConverter}.
*
* @author Rossen Stoyanchev
*/
public class HttpEntityArgumentResolver extends AbstractMessageConverterArgumentResolver
implements HandlerMethodArgumentResolver {
/**
* Constructor with message converters and a ConversionService.
* @param converters converters for reading the request body with
* @param service for converting to other reactive types from Flux and Mono
*/
public HttpEntityArgumentResolver(List<HttpMessageConverter<?>> converters,
ConversionService service) {
this(converters, service, null);
}
/**
* Constructor with message converters and a ConversionService.
* @param converters converters for reading the request body with
* @param service for converting to other reactive types from Flux and Mono
* @param validator validator to validate decoded objects with
*/
public HttpEntityArgumentResolver(List<HttpMessageConverter<?>> converters,
ConversionService service, Validator validator) {
super(converters, service, validator);
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
Class<?> clazz = parameter.getParameterType();
return (HttpEntity.class.equals(clazz) || RequestEntity.class.equals(clazz));
}
@Override
public Mono<Object> resolveArgument(MethodParameter param, ModelMap model, ServerWebExchange exchange) {
ResolvableType entityType;
MethodParameter bodyParameter;
if (getConversionService().canConvert(Mono.class, param.getParameterType())) {
entityType = ResolvableType.forMethodParameter(param).getGeneric(0);
bodyParameter = new MethodParameter(param);
bodyParameter.increaseNestingLevel();
bodyParameter.increaseNestingLevel();
}
else {
entityType = ResolvableType.forMethodParameter(param);
bodyParameter = new MethodParameter(param);
bodyParameter.increaseNestingLevel();
}
return readBody(bodyParameter, false, exchange)
.map(body -> createHttpEntity(body, entityType, exchange))
.defaultIfEmpty(createHttpEntity(null, entityType, exchange));
}
private Object createHttpEntity(Object body, ResolvableType entityType,
ServerWebExchange exchange) {
ServerHttpRequest request = exchange.getRequest();
HttpHeaders headers = request.getHeaders();
if (RequestEntity.class == entityType.getRawClass()) {
return new RequestEntity<>(body, headers, request.getMethod(), request.getURI());
}
else {
return new HttpEntity<>(body, headers);
}
}
}