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MultipartWriterSupport.java
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MultipartWriterSupport.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.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import reactor.core.publisher.Mono;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.codec.LoggingCodecSupport;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.util.MimeTypeUtils;
/**
* Support class for multipart HTTP message writers.
*
* @author Rossen Stoyanchev
* @since 5.3
*/
public class MultipartWriterSupport extends LoggingCodecSupport {
/** THe default charset used by the writer. */
public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
private final List<MediaType> supportedMediaTypes;
private Charset charset = DEFAULT_CHARSET;
/**
* Constructor with the list of supported media types.
*/
protected MultipartWriterSupport(List<MediaType> supportedMediaTypes) {
this.supportedMediaTypes = supportedMediaTypes;
}
/**
* Return the configured charset for part headers.
*/
public Charset getCharset() {
return this.charset;
}
/**
* Set the character set to use for part headers such as
* "Content-Disposition" (and its filename parameter).
* <p>By default this is set to "UTF-8". If changed from this default,
* the "Content-Type" header will have a "charset" parameter that specifies
* the character set used.
*/
public void setCharset(Charset charset) {
Assert.notNull(charset, "Charset must not be null");
this.charset = charset;
}
public List<MediaType> getWritableMediaTypes() {
return this.supportedMediaTypes;
}
/**
* Generate a multipart boundary.
* <p>By default delegates to {@link MimeTypeUtils#generateMultipartBoundary()}.
*/
protected byte[] generateMultipartBoundary() {
return MimeTypeUtils.generateMultipartBoundary();
}
/**
* Prepare the {@code MediaType} to use by adding "boundary" and "charset"
* parameters to the given {@code mediaType} or "multipart/form-data"
* otherwise by default.
*/
protected MediaType getMultipartMediaType(@Nullable MediaType mediaType, byte[] boundary) {
Map<String, String> params = new HashMap<>();
if (mediaType != null) {
params.putAll(mediaType.getParameters());
}
params.put("boundary", new String(boundary, StandardCharsets.US_ASCII));
Charset charset = getCharset();
if (!charset.equals(StandardCharsets.UTF_8) &&
!charset.equals(StandardCharsets.US_ASCII) ) {
params.put("charset", charset.name());
}
mediaType = (mediaType != null ? mediaType : MediaType.MULTIPART_FORM_DATA);
mediaType = new MediaType(mediaType, params);
return mediaType;
}
protected Mono<DataBuffer> generateBoundaryLine(byte[] boundary, DataBufferFactory bufferFactory) {
return Mono.fromCallable(() -> {
DataBuffer buffer = bufferFactory.allocateBuffer(boundary.length + 4);
buffer.write((byte)'-');
buffer.write((byte)'-');
buffer.write(boundary);
buffer.write((byte)'\r');
buffer.write((byte)'\n');
return buffer;
});
}
protected Mono<DataBuffer> generateNewLine(DataBufferFactory bufferFactory) {
return Mono.fromCallable(() -> {
DataBuffer buffer = bufferFactory.allocateBuffer(2);
buffer.write((byte)'\r');
buffer.write((byte)'\n');
return buffer;
});
}
protected Mono<DataBuffer> generateLastLine(byte[] boundary, DataBufferFactory bufferFactory) {
return Mono.fromCallable(() -> {
DataBuffer buffer = bufferFactory.allocateBuffer(boundary.length + 6);
buffer.write((byte)'-');
buffer.write((byte)'-');
buffer.write(boundary);
buffer.write((byte)'-');
buffer.write((byte)'-');
buffer.write((byte)'\r');
buffer.write((byte)'\n');
return buffer;
});
}
protected Mono<DataBuffer> generatePartHeaders(HttpHeaders headers, DataBufferFactory bufferFactory) {
return Mono.fromCallable(() -> {
@SuppressWarnings("resource")
FastByteArrayOutputStream bos = new FastByteArrayOutputStream();
for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
byte[] headerName = entry.getKey().getBytes(getCharset());
for (String headerValueString : entry.getValue()) {
byte[] headerValue = headerValueString.getBytes(getCharset());
bos.write(headerName);
bos.write((byte)':');
bos.write((byte)' ');
bos.write(headerValue);
bos.write((byte)'\r');
bos.write((byte)'\n');
}
}
bos.write((byte)'\r');
bos.write((byte)'\n');
byte[] bytes = bos.toByteArrayUnsafe();
return bufferFactory.wrap(bytes);
});
}
}