com.sun.jersey.multipart.impl.MultiPartWriter Maven / Gradle / Ivy
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package com.sun.jersey.multipart.impl;
import com.sun.jersey.multipart.Boundary;
import com.sun.jersey.multipart.BodyPart;
import com.sun.jersey.multipart.BodyPartEntity;
import com.sun.jersey.multipart.MultiPart;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
import java.util.Map;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;
/**
* {@link Provider} {@link MessageBodyWriter} implementation for
* {@link MultiPart} entities.
*/
//@Provider
@Produces("multipart/*")
public class MultiPartWriter implements MessageBodyWriter {
private static final Annotation[] EMPTY_ANNOTATIONS = new Annotation[0];
/**
* Injectable helper to look up appropriate {@link Provider}s
* for our body parts.
*/
private final Providers providers;
public MultiPartWriter(@Context Providers providers) {
this.providers = providers;
}
@Override
public long getSize(MultiPart entity, Class type, Type genericType,
Annotation[] annotations, MediaType mediaType) {
return -1;
}
@Override
public boolean isWriteable(Class type, Type genericType,
Annotation[] annotations, MediaType mediaType) {
return MultiPart.class.isAssignableFrom(type);
}
/**
* Write the entire list of body parts to the output stream, using the
* appropriate provider implementation to serialize each body part's entity.
*
* @param entity The {@link MultiPart} instance to write
* @param type The class of the object to be written (i.e. {@link MultiPart}.class)
* @param genericType The type of object to be written
* @param annotations Annotations on the resource method that returned this object
* @param mediaType Media type (multipart/*) of this entity
* @param headers Mutable map of HTTP headers for the entire response
* @param stream Output stream to which the entity should be written
*
* @throws java.io.IOException if an I/O error occurs
* @throws javax.ws.rs.WebApplicationException if an HTTP error response
* needs to be produced (only effective if the response is not committed yet)
*/
@Override
public void writeTo(MultiPart entity, Class type, Type genericType,
Annotation[] annotations, MediaType mediaType,
MultivaluedMap headers,
OutputStream stream) throws IOException, WebApplicationException {
// Verify that there is at least one body part
if ((entity.getBodyParts() == null) || (entity.getBodyParts().size() < 1)) {
throw new WebApplicationException(new IllegalArgumentException("Must specify at least one body part"));
}
// If our entity is not nested, make sure the MIME-Version header is set
if (entity.getParent() == null) {
Object value = headers.getFirst("MIME-Version");
if (value == null) {
headers.putSingle("MIME-Version", "1.0");
}
}
// Initialize local variables we need
final Writer writer = new BufferedWriter(new OutputStreamWriter(stream)); // FIXME - charset???
// Determine the boundary string to be used, creating one if needed
final MediaType boundaryMediaType = Boundary.addBoundary(mediaType);
if (boundaryMediaType != mediaType) {
headers.putSingle(HttpHeaders.CONTENT_TYPE, boundaryMediaType);
}
final String boundaryString = boundaryMediaType.getParameters().get("boundary");
// Iterate through the body parts for this message
boolean isFirst = true;
for (final BodyPart bodyPart : entity.getBodyParts()) {
// Write the leading boundary string
if (isFirst) {
isFirst = false;
writer.write("--");
} else {
writer.write("\r\n--");
}
writer.write(boundaryString);
writer.write("\r\n");
// Write the headers for this body part
final MediaType bodyMediaType = bodyPart.getMediaType();
if (bodyMediaType == null) {
throw new WebApplicationException(new IllegalArgumentException("Missing body part media type"));
}
final MultivaluedMap bodyHeaders = bodyPart.getHeaders();
bodyHeaders.putSingle("Content-Type", bodyMediaType.toString());
if (bodyHeaders.getFirst("Content-Disposition") == null
&& bodyPart.getContentDisposition() != null) {
bodyHeaders.putSingle("Content-Disposition", bodyPart.getContentDisposition().toString());
}
// Iterate for the nested body parts
for (final Map.Entry> entry : bodyHeaders.entrySet()) {
// Write this header and its value(s)
writer.write(entry.getKey());
writer.write(':');
boolean first = true;
for (String value : entry.getValue()) {
if (first) {
writer.write(' ');
first = false;
} else {
writer.write(',');
}
writer.write(value);
}
writer.write("\r\n");
}
// Mark the end of the headers for this body part
writer.write("\r\n");
writer.flush();
// Write the entity for this body part
Object bodyEntity = bodyPart.getEntity();
if (bodyEntity == null) {
throw new WebApplicationException(
new IllegalArgumentException("Missing body part entity of type '" + bodyMediaType + "'"));
}
Class bodyClass = bodyEntity.getClass();
if (bodyEntity instanceof BodyPartEntity) {
bodyClass = InputStream.class;
bodyEntity = ((BodyPartEntity) bodyEntity).getInputStream();
}
final MessageBodyWriter bodyWriter = providers.getMessageBodyWriter(
bodyClass,
bodyClass,
EMPTY_ANNOTATIONS,
bodyMediaType);
if (bodyWriter == null) {
throw new WebApplicationException(
new IllegalArgumentException(
"No MessageBodyWriter for body part of type '" +
bodyEntity.getClass().getName() + "' and media type '" +
bodyMediaType + "'"));
}
bodyWriter.writeTo(
bodyEntity,
bodyClass,
bodyClass,
EMPTY_ANNOTATIONS,
bodyMediaType,
bodyHeaders,
stream);
}
// Write the final boundary string
writer.write("\r\n--");
writer.write(boundaryString);
writer.write("--\r\n");
writer.flush();
}
}
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