org.apache.xml.security.stax.impl.transformer.TransformIdentity Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of xmlsec Show documentation
Show all versions of xmlsec Show documentation
Apache XML Security for Java supports XML-Signature Syntax and Processing,
W3C Recommendation 12 February 2002, and XML Encryption Syntax and
Processing, W3C Recommendation 10 December 2002. As of version 1.4,
the library supports the standard Java API JSR-105: XML Digital Signature APIs.
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.xml.security.stax.impl.transformer;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.Transformer;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;
import org.apache.xml.security.stax.ext.XMLSecurityUtils;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.impl.processor.input.XMLEventReaderInputProcessor;
import org.apache.xml.security.stax.impl.util.UnsynchronizedByteArrayInputStream;
import org.apache.xml.security.stax.impl.util.UnsynchronizedByteArrayOutputStream;
import javax.xml.stream.*;
import java.io.*;
import java.util.Map;
/**
* @author $Author: $
* @version $Revision: $ $Date: $
*/
public class TransformIdentity implements Transformer {
private static XMLOutputFactory xmlOutputFactory;
private static XMLInputFactory xmlInputFactory;
private OutputStream outputStream;
private XMLEventWriter xmlEventWriterForOutputStream;
private Transformer transformer;
private ChildOutputMethod childOutputMethod;
protected static XMLOutputFactory getXmlOutputFactory() {
synchronized(TransformIdentity.class) {
if (xmlOutputFactory == null) {
xmlOutputFactory = XMLOutputFactory.newInstance();
}
}
return xmlOutputFactory;
}
public static XMLInputFactory getXmlInputFactory() {
synchronized(TransformIdentity.class) {
if (xmlInputFactory == null) {
xmlInputFactory = XMLInputFactory.newInstance();
}
}
return xmlInputFactory;
}
@Override
public void setOutputStream(OutputStream outputStream) throws XMLSecurityException {
this.outputStream = outputStream;
}
protected OutputStream getOutputStream() {
return this.outputStream;
}
protected XMLEventWriter getXmlEventWriterForOutputStream() throws XMLStreamException {
if (this.xmlEventWriterForOutputStream != null) {
return this.xmlEventWriterForOutputStream;
}
if (this.outputStream != null) {
return this.xmlEventWriterForOutputStream = getXmlOutputFactory().createXMLEventWriter(new FilterOutputStream(outputStream) {
@Override
public void close() throws IOException {
//do not close the parent output stream!
super.flush();
}
});
}
return null;
}
@Override
public void setTransformer(Transformer transformer) throws XMLSecurityException {
this.transformer = transformer;
}
protected Transformer getTransformer() {
return transformer;
}
@Override
public void setProperties(Map properties) throws XMLSecurityException {
throw new UnsupportedOperationException("no properties supported");
}
@Override
public XMLSecurityConstants.TransformMethod getPreferredTransformMethod(XMLSecurityConstants.TransformMethod forInput) {
switch (forInput) {
case XMLSecEvent:
return XMLSecurityConstants.TransformMethod.XMLSecEvent;
case InputStream:
return XMLSecurityConstants.TransformMethod.InputStream;
default:
throw new IllegalArgumentException("Unsupported class " + forInput.name());
}
}
@Override
public void transform(XMLSecEvent xmlSecEvent) throws XMLStreamException {
if (getXmlEventWriterForOutputStream() != null) {
//we have an output stream
getXmlEventWriterForOutputStream().add(xmlSecEvent);
} else {
//we have a child transformer
if (childOutputMethod == null) {
final XMLSecurityConstants.TransformMethod preferredChildTransformMethod =
getTransformer().getPreferredTransformMethod(XMLSecurityConstants.TransformMethod.XMLSecEvent);
switch (preferredChildTransformMethod) {
case XMLSecEvent: {
childOutputMethod = new ChildOutputMethod() {
@Override
public void transform(Object object) throws XMLStreamException {
getTransformer().transform((XMLSecEvent) object);
}
@Override
public void doFinal() throws XMLStreamException {
getTransformer().doFinal();
}
};
break;
}
case InputStream: {
childOutputMethod = new ChildOutputMethod() {
private UnsynchronizedByteArrayOutputStream baos;
private XMLEventWriter xmlEventWriter;
@Override
public void transform(Object object) throws XMLStreamException {
if (xmlEventWriter == null) {
baos = new UnsynchronizedByteArrayOutputStream();
xmlEventWriter = getXmlOutputFactory().createXMLEventWriter(baos);
}
xmlEventWriter.add((XMLSecEvent) object);
}
@Override
public void doFinal() throws XMLStreamException {
xmlEventWriter.close();
getTransformer().transform(new UnsynchronizedByteArrayInputStream(baos.toByteArray()));
getTransformer().doFinal();
}
};
break;
}
}
}
childOutputMethod.transform(xmlSecEvent);
}
}
@Override
public void transform(final InputStream inputStream) throws XMLStreamException {
if (getOutputStream() != null) {
//we have an output stream
try {
XMLSecurityUtils.copy(inputStream, getOutputStream());
} catch (IOException e) {
throw new XMLStreamException(e);
}
} else {
//we have a child transformer
if (childOutputMethod == null) {
final XMLSecurityConstants.TransformMethod preferredChildTransformMethod =
getTransformer().getPreferredTransformMethod(XMLSecurityConstants.TransformMethod.InputStream);
switch (preferredChildTransformMethod) {
case XMLSecEvent: {
childOutputMethod = new ChildOutputMethod() {
private XMLEventReaderInputProcessor xmlEventReaderInputProcessor;
@Override
public void transform(Object object) throws XMLStreamException {
if (xmlEventReaderInputProcessor == null) {
xmlEventReaderInputProcessor = new XMLEventReaderInputProcessor(
null,
getXmlInputFactory().createXMLStreamReader(inputStream)
);
}
try {
XMLSecEvent xmlSecEvent;
do {
xmlSecEvent = xmlEventReaderInputProcessor.processNextEvent(null);
getTransformer().transform(xmlSecEvent);
} while (xmlSecEvent.getEventType() != XMLStreamConstants.END_DOCUMENT);
} catch (XMLSecurityException e) {
throw new XMLStreamException(e);
}
}
@Override
public void doFinal() throws XMLStreamException {
getTransformer().doFinal();
}
};
break;
}
case InputStream: {
childOutputMethod = new ChildOutputMethod() {
@Override
public void transform(Object object) throws XMLStreamException {
getTransformer().transform(inputStream);
}
@Override
public void doFinal() throws XMLStreamException {
getTransformer().doFinal();
}
};
break;
}
}
}
childOutputMethod.transform(inputStream);
}
}
@Override
public void doFinal() throws XMLStreamException {
if (xmlEventWriterForOutputStream != null) {
xmlEventWriterForOutputStream.close();
}
if (childOutputMethod != null) {
childOutputMethod.doFinal();
} else if (transformer != null) {
transformer.doFinal();
}
}
interface ChildOutputMethod {
void transform(Object object) throws XMLStreamException;
void doFinal() throws XMLStreamException;
}
}