org.springframework.http.codec.multipart.MultipartHttpMessageReader Maven / Gradle / Ivy
/*
* 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.http.codec.multipart;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.ResolvableType;
import org.springframework.core.codec.Hints;
import org.springframework.core.log.LogFormatUtils;
import org.springframework.http.MediaType;
import org.springframework.http.ReactiveHttpInputMessage;
import org.springframework.http.codec.HttpMessageReader;
import org.springframework.http.codec.LoggingCodecSupport;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* {@code HttpMessageReader} for reading {@code "multipart/form-data"} requests
* into a {@code MultiValueMap}.
*
* Note that this reader depends on access to an
* {@code HttpMessageReader} for the actual parsing of multipart content.
* The purpose of this reader is to collect the parts into a map.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public class MultipartHttpMessageReader extends LoggingCodecSupport
implements HttpMessageReader> {
private static final ResolvableType MULTIPART_VALUE_TYPE = ResolvableType.forClassWithGenerics(
MultiValueMap.class, String.class, Part.class);
private final HttpMessageReader partReader;
public MultipartHttpMessageReader(HttpMessageReader partReader) {
Assert.notNull(partReader, "'partReader' is required");
this.partReader = partReader;
}
@Override
public List getReadableMediaTypes() {
return Collections.singletonList(MediaType.MULTIPART_FORM_DATA);
}
@Override
public boolean canRead(ResolvableType elementType, @Nullable MediaType mediaType) {
return MULTIPART_VALUE_TYPE.isAssignableFrom(elementType) &&
(mediaType == null || MediaType.MULTIPART_FORM_DATA.isCompatibleWith(mediaType));
}
@Override
public Flux> read(ResolvableType elementType,
ReactiveHttpInputMessage message, Map hints) {
return Flux.from(readMono(elementType, message, hints));
}
@Override
public Mono> readMono(ResolvableType elementType,
ReactiveHttpInputMessage inputMessage, Map hints) {
Map allHints = Hints.merge(hints, Hints.SUPPRESS_LOGGING_HINT, true);
return this.partReader.read(elementType, inputMessage, allHints)
.collectMultimap(Part::name)
.doOnNext(map -> {
LogFormatUtils.traceDebug(logger, traceOn -> Hints.getLogPrefix(hints) + "Parsed " +
(isEnableLoggingRequestDetails() ?
LogFormatUtils.formatValue(map, !traceOn) :
"parts " + map.keySet() + " (content masked)"));
})
.map(this::toMultiValueMap);
}
private LinkedMultiValueMap toMultiValueMap(Map> map) {
return new LinkedMultiValueMap<>(map.entrySet().stream()
.collect(Collectors.toMap(Map.Entry::getKey, e -> toList(e.getValue()))));
}
private List toList(Collection collection) {
return collection instanceof List ? (List) collection : new ArrayList<>(collection);
}
}