/
PartHttpMessageWriter.java
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/
PartHttpMessageWriter.java
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/*
* Copyright 2002-2022 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
*
* https://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.Map;
import org.reactivestreams.Publisher;
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.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ReactiveHttpOutputMessage;
import org.springframework.http.codec.HttpMessageWriter;
import org.springframework.lang.Nullable;
/**
* {@link HttpMessageWriter} for writing with {@link Part}. This can be useful
* on the server side to write a {@code Flux<Part>} received from a client to
* some remote service.
*
* @author Rossen Stoyanchev
* @since 5.3
*/
public class PartHttpMessageWriter extends MultipartWriterSupport implements HttpMessageWriter<Part> {
public PartHttpMessageWriter() {
super(MultipartHttpMessageReader.MIME_TYPES);
}
@Override
public boolean canWrite(ResolvableType elementType, @Nullable MediaType mediaType) {
if (Part.class.isAssignableFrom(elementType.toClass())) {
if (mediaType == null) {
return true;
}
for (MediaType supportedMediaType : getWritableMediaTypes()) {
if (supportedMediaType.isCompatibleWith(mediaType)) {
return true;
}
}
}
return false;
}
@Override
public Mono<Void> write(Publisher<? extends Part> parts,
ResolvableType elementType, @Nullable MediaType mediaType, ReactiveHttpOutputMessage outputMessage,
Map<String, Object> hints) {
byte[] boundary = generateMultipartBoundary();
mediaType = getMultipartMediaType(mediaType, boundary);
outputMessage.getHeaders().setContentType(mediaType);
if (logger.isDebugEnabled()) {
logger.debug(Hints.getLogPrefix(hints) + "Encoding Publisher<Part>");
}
Flux<DataBuffer> body = Flux.from(parts)
.concatMap(part -> encodePart(boundary, part, outputMessage.bufferFactory()))
.concatWith(generateLastLine(boundary, outputMessage.bufferFactory()))
.doOnDiscard(DataBuffer.class, DataBufferUtils::release);
if (logger.isDebugEnabled()) {
body = body.doOnNext(buffer -> Hints.touchDataBuffer(buffer, hints, logger));
}
return outputMessage.writeWith(body);
}
private <T> Flux<DataBuffer> encodePart(byte[] boundary, Part part, DataBufferFactory bufferFactory) {
HttpHeaders headers = new HttpHeaders(part.headers());
String name = part.name();
if (!headers.containsKey(HttpHeaders.CONTENT_DISPOSITION)) {
headers.setContentDispositionFormData(name,
(part instanceof FilePart filePart ? filePart.filename() : null));
}
return Flux.concat(
generateBoundaryLine(boundary, bufferFactory),
generatePartHeaders(headers, bufferFactory),
part.content(),
generateNewLine(bufferFactory));
}
}