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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.processor.output;
import java.util.ArrayList;
import java.util.List;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.OutputProcessorChain;
import org.apache.xml.security.stax.ext.SecurePart;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;
import org.apache.xml.security.stax.ext.stax.XMLSecAttribute;
import org.apache.xml.security.stax.ext.stax.XMLSecEvent;
import org.apache.xml.security.stax.ext.stax.XMLSecStartElement;
import org.apache.xml.security.stax.impl.SignaturePartDef;
import org.apache.xml.security.stax.impl.util.IDGenerator;
/**
* An OutputProcessor for XML Signature.
*/
public class XMLSignatureOutputProcessor extends AbstractSignatureOutputProcessor {
private static final transient Logger logger = LoggerFactory.getLogger(XMLSignatureOutputProcessor.class);
public XMLSignatureOutputProcessor() throws XMLSecurityException {
super();
}
@Override
public void init(OutputProcessorChain outputProcessorChain) throws XMLSecurityException {
super.init(outputProcessorChain);
XMLSignatureEndingOutputProcessor signatureEndingOutputProcessor = new XMLSignatureEndingOutputProcessor(this);
signatureEndingOutputProcessor.setXMLSecurityProperties(getSecurityProperties());
signatureEndingOutputProcessor.setAction(getAction());
signatureEndingOutputProcessor.init(outputProcessorChain);
}
@Override
public void processEvent(XMLSecEvent xmlSecEvent, OutputProcessorChain outputProcessorChain) throws XMLStreamException, XMLSecurityException {
if (xmlSecEvent.getEventType() == XMLStreamConstants.START_ELEMENT) {
XMLSecStartElement xmlSecStartElement = xmlSecEvent.asStartElement();
//avoid double signature when child elements matches too
if (getActiveInternalSignatureOutputProcessor() == null) {
SecurePart securePart = securePartMatches(xmlSecStartElement, outputProcessorChain, XMLSecurityConstants.SIGNATURE_PARTS);
if (securePart != null) {
logger.debug("Matched securePart for signature");
InternalSignatureOutputProcessor internalSignatureOutputProcessor = null;
SignaturePartDef signaturePartDef = new SignaturePartDef();
signaturePartDef.setSecurePart(securePart);
signaturePartDef.setTransforms(securePart.getTransforms());
if (signaturePartDef.getTransforms() == null) {
signaturePartDef.setTransforms(new String[]{XMLSecurityConstants.NS_C14N_EXCL_OMIT_COMMENTS});
}
signaturePartDef.setExcludeVisibleC14Nprefixes(true);
signaturePartDef.setDigestAlgo(securePart.getDigestMethod());
if (signaturePartDef.getDigestAlgo() == null) {
signaturePartDef.setDigestAlgo(getSecurityProperties().getSignatureDigestAlgorithm());
}
if (securePart.getIdToSign() == null) {
signaturePartDef.setGenerateXPointer(securePart.isGenerateXPointer());
signaturePartDef.setSigRefId(IDGenerator.generateID(null));
Attribute attribute = xmlSecStartElement.getAttributeByName(XMLSecurityConstants.ATT_NULL_Id);
if (attribute != null) {
signaturePartDef.setSigRefId(attribute.getValue());
} else {
List attributeList = new ArrayList(1);
attributeList.add(createAttribute(XMLSecurityConstants.ATT_NULL_Id, signaturePartDef.getSigRefId()));
xmlSecEvent = addAttributes(xmlSecStartElement, attributeList);
}
} else {
signaturePartDef.setSigRefId(securePart.getIdToSign());
}
getSignaturePartDefList().add(signaturePartDef);
internalSignatureOutputProcessor = new InternalSignatureOutputProcessor(signaturePartDef, xmlSecStartElement);
internalSignatureOutputProcessor.setXMLSecurityProperties(getSecurityProperties());
internalSignatureOutputProcessor.setAction(getAction());
internalSignatureOutputProcessor.addAfterProcessor(XMLSignatureOutputProcessor.class.getName());
internalSignatureOutputProcessor.addBeforeProcessor(XMLSignatureEndingOutputProcessor.class.getName());
internalSignatureOutputProcessor.init(outputProcessorChain);
setActiveInternalSignatureOutputProcessor(internalSignatureOutputProcessor);
}
}
}
outputProcessorChain.processEvent(xmlSecEvent);
}
}