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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.xml.security.stax.ext.XMLSecurityConstants;
import org.apache.xml.security.stax.ext.stax.XMLSecEndElement;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.ext.stax.XMLSecStartElement;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import java.io.InputStream;
/**
* @author $Author: giger $
* @version $Revision: 1367437 $ $Date: 2012-07-31 08:20:29 +0100 (Tue, 31 Jul 2012) $
*/
public class TransformEnvelopedSignature extends TransformIdentity {
private int curLevel = 0;
private int sigElementLevel = -1;
@Override
public XMLSecurityConstants.TransformMethod getPreferredTransformMethod(XMLSecurityConstants.TransformMethod forInput) {
switch (forInput) {
case XMLSecEvent:
return XMLSecurityConstants.TransformMethod.XMLSecEvent;
case InputStream:
return XMLSecurityConstants.TransformMethod.XMLSecEvent;
default:
throw new IllegalArgumentException("Unsupported class " + forInput.name());
}
}
@Override
public void transform(XMLSecEvent xmlSecEvent) throws XMLStreamException {
switch (xmlSecEvent.getEventType()) {
case XMLStreamConstants.START_ELEMENT:
curLevel++;
XMLSecStartElement xmlSecStartElement = xmlSecEvent.asStartElement();
if (XMLSecurityConstants.TAG_dsig_Signature.equals(xmlSecStartElement.getName())) {
sigElementLevel = curLevel;
return;
}
break;
case XMLStreamConstants.END_ELEMENT:
XMLSecEndElement xmlSecEndElement = xmlSecEvent.asEndElement();
if (sigElementLevel == curLevel && XMLSecurityConstants.TAG_dsig_Signature.equals(xmlSecEndElement.getName())) {
sigElementLevel = -1;
return;
}
curLevel--;
}
if (sigElementLevel == -1) {
super.transform(xmlSecEvent);
}
}
@Override
public void transform(InputStream inputStream) throws XMLStreamException {
//there is no use case at the moment but can be implemented if needed
throw new UnsupportedOperationException("transform(InputStream) not supported");
}
}