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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 org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.util.Assert;
/**
* Default implementations of {@link PartEvent} and subtypes.
*
* @author Arjen Poutsma
* @since 6.0
*/
abstract class DefaultPartEvents {
public static FormPartEvent form(HttpHeaders headers) {
Assert.notNull(headers, "Headers must not be null");
return new DefaultFormFieldPartEvent(headers);
}
public static FormPartEvent form(HttpHeaders headers, String value) {
Assert.notNull(headers, "Headers must not be null");
Assert.notNull(value, "Value must not be null");
return new DefaultFormFieldPartEvent(headers, value);
}
public static FilePartEvent file(HttpHeaders headers, DataBuffer dataBuffer, boolean isLast) {
Assert.notNull(headers, "Headers must not be null");
Assert.notNull(dataBuffer, "DataBuffer must not be null");
return new DefaultFilePartEvent(headers, dataBuffer, isLast);
}
public static FilePartEvent file(HttpHeaders headers) {
Assert.notNull(headers, "Headers must not be null");
return new DefaultFilePartEvent(headers);
}
public static PartEvent create(HttpHeaders headers, DataBuffer dataBuffer, boolean isLast) {
Assert.notNull(headers, "Headers must not be null");
Assert.notNull(dataBuffer, "DataBuffer must not be null");
if (headers.getContentDisposition().getFilename() != null) {
return file(headers, dataBuffer, isLast);
}
else {
return new DefaultPartEvent(headers, dataBuffer, isLast);
}
}
public static PartEvent create(HttpHeaders headers) {
Assert.notNull(headers, "Headers must not be null");
if (headers.getContentDisposition().getFilename() != null) {
return file(headers);
}
else {
return new DefaultPartEvent(headers);
}
}
private static abstract class AbstractPartEvent implements PartEvent {
private final HttpHeaders headers;
protected AbstractPartEvent(HttpHeaders headers) {
this.headers = HttpHeaders.readOnlyHttpHeaders(headers);
}
@Override
public HttpHeaders headers() {
return this.headers;
}
}
/**
* Default implementation of {@link PartEvent}.
*/
private static class DefaultPartEvent extends AbstractPartEvent {
private static final DataBuffer EMPTY = DefaultDataBufferFactory.sharedInstance.allocateBuffer(0);
private final DataBuffer content;
private final boolean last;
public DefaultPartEvent(HttpHeaders headers) {
this(headers, EMPTY, true);
}
public DefaultPartEvent(HttpHeaders headers, DataBuffer content, boolean last) {
super(headers);
this.content = content;
this.last = last;
}
@Override
public DataBuffer content() {
return this.content;
}
@Override
public boolean isLast() {
return this.last;
}
}
/**
* Default implementation of {@link FormPartEvent}.
*/
private static final class DefaultFormFieldPartEvent extends AbstractPartEvent implements FormPartEvent {
private static final String EMPTY = "";
private final String value;
public DefaultFormFieldPartEvent(HttpHeaders headers) {
this(headers, EMPTY);
}
public DefaultFormFieldPartEvent(HttpHeaders headers, String value) {
super(headers);
this.value = value;
}
@Override
public String value() {
return this.value;
}
@Override
public DataBuffer content() {
byte[] bytes = this.value.getBytes(MultipartUtils.charset(headers()));
return DefaultDataBufferFactory.sharedInstance.wrap(bytes);
}
@Override
public boolean isLast() {
return true;
}
}
/**
* Default implementation of {@link FilePartEvent}.
*/
private static class DefaultFilePartEvent extends DefaultPartEvent implements FilePartEvent {
public DefaultFilePartEvent(HttpHeaders headers) {
super(headers);
}
public DefaultFilePartEvent(HttpHeaders headers, DataBuffer content, boolean last) {
super(headers, content, last);
}
}
}