001/*
002 * Copyright 2002-2019 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.web.reactive.result.method.annotation;
018
019import java.util.List;
020
021import reactor.core.publisher.Mono;
022
023import org.springframework.core.MethodParameter;
024import org.springframework.core.ReactiveAdapterRegistry;
025import org.springframework.http.codec.HttpMessageReader;
026import org.springframework.util.Assert;
027import org.springframework.web.bind.annotation.RequestBody;
028import org.springframework.web.reactive.BindingContext;
029import org.springframework.web.server.ServerWebExchange;
030import org.springframework.web.server.ServerWebInputException;
031
032/**
033 * Resolves method arguments annotated with {@code @RequestBody} by reading the
034 * body of the request through a compatible {@code HttpMessageReader}.
035 *
036 * <p>An {@code @RequestBody} method argument is also validated if it is
037 * annotated with {@code @javax.validation.Valid} or
038 * {@link org.springframework.validation.annotation.Validated}. Validation
039 * failure results in an {@link ServerWebInputException}.
040 *
041 * @author Sebastien Deleuze
042 * @author Stephane Maldini
043 * @author Rossen Stoyanchev
044 * @since 5.2
045 */
046public class RequestBodyMethodArgumentResolver extends AbstractMessageReaderArgumentResolver {
047
048        public RequestBodyMethodArgumentResolver(List<HttpMessageReader<?>> readers, ReactiveAdapterRegistry registry) {
049                super(readers, registry);
050        }
051
052
053        @Override
054        public boolean supportsParameter(MethodParameter parameter) {
055                return parameter.hasParameterAnnotation(RequestBody.class);
056        }
057
058        @Override
059        public Mono<Object> resolveArgument(
060                        MethodParameter param, BindingContext bindingContext, ServerWebExchange exchange) {
061
062                RequestBody ann = param.getParameterAnnotation(RequestBody.class);
063                Assert.state(ann != null, "No RequestBody annotation");
064                return readBody(param, ann.required(), bindingContext, exchange);
065        }
066
067}