/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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
*
* 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 com.sun.org.apache.xml.internal.security.transforms.implementations;
import com.sun.org.apache.xml.internal.security.signature.NodeFilter;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import com.sun.org.apache.xml.internal.security.transforms.TransformSpi;
import com.sun.org.apache.xml.internal.security.transforms.TransformationException;
import com.sun.org.apache.xml.internal.security.transforms.Transforms;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Implements the <CODE>http://www.w3.org/2000/09/xmldsig#enveloped-signature</CODE>
* transform.
*
* @author Christian Geuer-Pollmann
*/
public class TransformEnvelopedSignature extends TransformSpi {
/** Field implementedTransformURI */
public static final String implementedTransformURI =
Transforms.TRANSFORM_ENVELOPED_SIGNATURE;
/**
* Method engineGetURI
*
* @inheritDoc
*/
protected String engineGetURI() {
return implementedTransformURI;
}
/**
* @inheritDoc
*/
protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input)
throws TransformationException {
/**
* If the actual input is an octet stream, then the application MUST
* convert the octet stream to an XPath node-set suitable for use by
* Canonical XML with Comments. (A subsequent application of the
* REQUIRED Canonical XML algorithm would strip away these comments.)
*
* ...
*
* The evaluation of this expression includes all of the document's nodes
* (including comments) in the node-set representing the octet stream.
*/
/*
if (input.isOctetStream()) {
input.setNodesetXPath(Canonicalizer.XPATH_C14N_WITH_COMMENTS);
}
*/
Element transformElement = this._transformObject.getElement();
Node signatureElement = transformElement;
signatureElement = searchSignatureElement(signatureElement);
input.setExcludeNode(signatureElement);
input.addNodeFilter(new EnvelopedNodeFilter(signatureElement));
return input;
//
}
/**
* @param signatureElement
* @return the node that is the signature
* @throws TransformationException
*/
private static Node searchSignatureElement(Node signatureElement) throws TransformationException {
boolean found=false;
while (true) {
if ((signatureElement == null)
|| (signatureElement.getNodeType() == Node.DOCUMENT_NODE)) {
break;
}
Element el=(Element)signatureElement;
if (el.getNamespaceURI().equals(Constants.SignatureSpecNS)
&&
el.getLocalName().equals(Constants._TAG_SIGNATURE)) {
found = true;
break;
}
signatureElement = signatureElement.getParentNode();
}
if (!found) {
throw new TransformationException(
"envelopedSignatureTransformNotInSignatureElement");
}
return signatureElement;
}
class EnvelopedNodeFilter implements NodeFilter {
Node exclude;
EnvelopedNodeFilter(Node n) {
exclude=n;
}
/**
* @see com.sun.org.apache.xml.internal.security.signature.NodeFilter#isNodeInclude(org.w3c.dom.Node)
*/
public boolean isNodeInclude(Node n) {
// TODO Optimize me.
return !XMLUtils.isDescendantOrSelf(exclude,n);
}
}
}