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MultipartFormContentProcessor.java
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MultipartFormContentProcessor.java
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/*
* Copyright 2019 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 feign.form;
import static feign.form.ContentType.MULTIPART;
import static lombok.AccessLevel.PRIVATE;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.LinkedList;
import java.util.Map;
import feign.Request;
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import feign.form.multipart.ByteArrayWriter;
import feign.form.multipart.DelegateWriter;
import feign.form.multipart.FormDataWriter;
import feign.form.multipart.ManyFilesWriter;
import feign.form.multipart.ManyParametersWriter;
import feign.form.multipart.Output;
import feign.form.multipart.PojoWriter;
import feign.form.multipart.SingleFileWriter;
import feign.form.multipart.SingleParameterWriter;
import feign.form.multipart.Writer;
import lombok.experimental.FieldDefaults;
import lombok.val;
/**
*
* @author Artem Labazin
*/
@FieldDefaults(level = PRIVATE, makeFinal = true)
public class MultipartFormContentProcessor implements ContentProcessor {
Deque<Writer> writers;
Writer defaultPerocessor;
/**
* Constructor with specific delegate encoder.
*
* @param delegate specific delegate encoder for cases, when this processor couldn't handle request parameter.
*/
public MultipartFormContentProcessor (Encoder delegate) {
writers = new LinkedList<Writer>();
addWriter(new ByteArrayWriter());
addWriter(new FormDataWriter());
addWriter(new SingleFileWriter());
addWriter(new ManyFilesWriter());
addWriter(new SingleParameterWriter());
addWriter(new ManyParametersWriter());
addWriter(new PojoWriter(writers));
defaultPerocessor = new DelegateWriter(delegate);
}
@Override
public void process (RequestTemplate template, Charset charset, Map<String, Object> data) throws EncodeException {
val boundary = Long.toHexString(System.currentTimeMillis());
val output = new Output(charset);
for (val entry : data.entrySet()) {
if (entry == null || entry.getKey() == null || entry.getValue() == null) {
continue;
}
val writer = findApplicableWriter(entry.getValue());
writer.write(output, boundary, entry.getKey(), entry.getValue());
}
output.write("--").write(boundary).write("--").write(CRLF);
val contentTypeHeaderValue = new StringBuilder()
.append(getSupportedContentType().getHeader())
.append("; charset=").append(charset.name())
.append("; boundary=").append(boundary)
.toString();
template.header(CONTENT_TYPE_HEADER, Collections.<String>emptyList()); // reset header
template.header(CONTENT_TYPE_HEADER, contentTypeHeaderValue);
// Feign's clients try to determine binary/string content by charset presence
// so, I set it to null (in spite of availability charset) for backward compatibility.
val bytes = output.toByteArray();
val body = Request.Body.encoded(bytes, null);
template.body(body);
try {
output.close();
} catch (IOException ex) {
throw new EncodeException("Output closing error", ex);
}
}
@Override
public ContentType getSupportedContentType () {
return MULTIPART;
}
/**
* Adds {@link Writer} instance in runtime.
*
* @param writer additional writer.
*/
public final void addWriter (Writer writer) {
writers.add(writer);
}
/**
* Adds {@link Writer} instance in runtime
* at the beginning of writers list.
*
* @param writer additional writer.
*/
public final void addFirstWriter (Writer writer) {
writers.addFirst(writer);
}
/**
* Adds {@link Writer} instance in runtime
* at the end of writers list.
*
* @param writer additional writer.
*/
public final void addLastWriter (Writer writer) {
writers.addLast(writer);
}
/**
* Returns the <b>unmodifiable</b> collection of all writers.
*
* @return writers collection.
*/
public final Collection<Writer> getWriters () {
return Collections.unmodifiableCollection(writers);
}
private Writer findApplicableWriter (Object value) {
for (val writer : writers) {
if (writer.isApplicable(value)) {
return writer;
}
}
return defaultPerocessor;
}
}