/*
* Copyright 2002-2017 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.ReactiveAdapter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.codec.multipart.Part;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.ValueConstants;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.ServerWebInputException;
/**
* Resolver for method arguments annotated with @{@link RequestPart}.
*
* @author Sebastien Deleuze
* @author Rossen Stoyanchev
* @since 5.0
*/
public class RequestPartMethodArgumentResolver extends AbstractNamedValueArgumentResolver {
/**
* Class constructor with a default resolution mode flag.
* @param registry for checking reactive type wrappers
*/
public RequestPartMethodArgumentResolver(ReactiveAdapterRegistry registry) {
super(null, registry);
}
@Override
public boolean supportsParameter(MethodParameter parameter) {
return parameter.hasParameterAnnotation(RequestPart.class);
}
@Override
protected NamedValueInfo createNamedValueInfo(MethodParameter parameter) {
RequestPart ann = parameter.getParameterAnnotation(RequestPart.class);
return (ann != null ? new RequestPartNamedValueInfo(ann) : new RequestPartNamedValueInfo());
}
@Override
protected Mono<Object> resolveName(String name, MethodParameter param, ServerWebExchange exchange) {
Mono<Object> partsMono = exchange.getMultipartData()
.filter(map -> !CollectionUtils.isEmpty(map.get(name)))
.map(map -> {
List<Part> parts = map.get(name);
return parts.size() == 1 ? parts.get(0) : parts;
});
ReactiveAdapter adapter = getAdapterRegistry().getAdapter(param.getParameterType());
return (adapter != null ? Mono.just(adapter.fromPublisher(partsMono)) : partsMono);
}
@Override
protected void handleMissingValue(String name, MethodParameter param, ServerWebExchange exchange) {
String type = param.getNestedParameterType().getSimpleName();
String reason = "Required " + type + " parameter '" + name + "' is not present";
throw new ServerWebInputException(reason, param);
}
private static class RequestPartNamedValueInfo extends NamedValueInfo {
RequestPartNamedValueInfo() {
super("", false, ValueConstants.DEFAULT_NONE);
}
RequestPartNamedValueInfo(RequestPart annotation) {
super(annotation.name(), annotation.required(), ValueConstants.DEFAULT_NONE);
}
}
}