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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.commons.codec.binary.Base64InputStream;
import org.apache.commons.codec.binary.Base64OutputStream;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;
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.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import java.io.*;
/**
* @author $Author: giger $
* @version $Revision: 1395267 $ $Date: 2012-10-07 11:02:46 +0100 (Sun, 07 Oct 2012) $
*/
public class TransformBase64Decode extends TransformIdentity {
private ChildOutputMethod childOutputMethod;
@Override
public void setOutputStream(OutputStream outputStream) throws XMLSecurityException {
super.setOutputStream(new Base64OutputStream(
new FilterOutputStream(outputStream) {
@Override
public void close() throws IOException {
//do not close the parent output stream!
super.flush();
}
},
false)
);
}
@Override
public XMLSecurityConstants.TransformMethod getPreferredTransformMethod(XMLSecurityConstants.TransformMethod forInput) {
switch (forInput) {
case XMLSecEvent:
return XMLSecurityConstants.TransformMethod.InputStream;
case InputStream:
return XMLSecurityConstants.TransformMethod.InputStream;
default:
throw new IllegalArgumentException("Unsupported class " + forInput.name());
}
}
@Override
public void transform(XMLSecEvent xmlSecEvent) throws XMLStreamException {
int eventType = xmlSecEvent.getEventType();
switch (eventType) {
case XMLStreamConstants.CHARACTERS:
if (getOutputStream() != null) {
//we have an output stream
//encoding shouldn't matter here, because the data is Base64 encoded and is therefore in the ASCII range.
try {
getOutputStream().write(xmlSecEvent.asCharacters().getData().getBytes());
} catch (IOException e) {
throw new XMLStreamException(e);
}
} 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() {
private UnsynchronizedByteArrayOutputStream byteArrayOutputStream;
private Base64OutputStream base64OutputStream;
@Override
public void transform(Object object) throws XMLStreamException {
if (base64OutputStream == null) {
byteArrayOutputStream = new UnsynchronizedByteArrayOutputStream();
base64OutputStream = new Base64OutputStream(byteArrayOutputStream, false);
}
try {
base64OutputStream.write(((byte[]) object));
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
@Override
public void doFinal() throws XMLStreamException {
try {
base64OutputStream.close();
} catch (IOException e) {
throw new XMLStreamException(e);
}
XMLEventReaderInputProcessor xmlEventReaderInputProcessor
= new XMLEventReaderInputProcessor(
null,
getXmlInputFactory().createXMLStreamReader(new UnsynchronizedByteArrayInputStream(byteArrayOutputStream.toByteArray()))
);
try {
XMLSecEvent xmlSecEvent;
do {
xmlSecEvent = xmlEventReaderInputProcessor.processNextEvent(null);
getTransformer().transform(xmlSecEvent);
} while (xmlSecEvent.getEventType() != XMLStreamConstants.END_DOCUMENT);
} catch (XMLSecurityException e) {
throw new XMLStreamException(e);
}
getTransformer().doFinal();
}
};
break;
}
case InputStream: {
childOutputMethod = new ChildOutputMethod() {
private UnsynchronizedByteArrayOutputStream byteArrayOutputStream;
private Base64OutputStream base64OutputStream;
@Override
public void transform(Object object) throws XMLStreamException {
if (base64OutputStream == null) {
byteArrayOutputStream = new UnsynchronizedByteArrayOutputStream();
base64OutputStream = new Base64OutputStream(byteArrayOutputStream, false);
}
try {
base64OutputStream.write(((byte[]) object));
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
@Override
public void doFinal() throws XMLStreamException {
try {
base64OutputStream.close();
} catch (IOException e) {
throw new XMLStreamException(e);
}
getTransformer().transform(new UnsynchronizedByteArrayInputStream(byteArrayOutputStream.toByteArray()));
getTransformer().doFinal();
}
};
break;
}
}
}
childOutputMethod.transform(xmlSecEvent.asCharacters().getData().getBytes());
}
break;
}
}
@Override
public void transform(InputStream inputStream) throws XMLStreamException {
if (getOutputStream() != null) {
super.transform(inputStream);
} else {
super.transform(new Base64InputStream(inputStream, false));
}
}
@Override
public void doFinal() throws XMLStreamException {
if (getOutputStream() != null) {
try {
getOutputStream().close();
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
if (childOutputMethod != null) {
childOutputMethod.doFinal();
} else if (getTransformer() != null) {
getTransformer().doFinal();
}
}
}