/*
* 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 java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.xml.XMLConstants;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
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.XMLUtils;
import org.w3c.dom.Element;
/**
* Class TransformXSLT
*
* Implements the <CODE>http://www.w3.org/TR/1999/REC-xslt-19991116</CODE>
* transform.
*
* @author Christian Geuer-Pollmann
*/
public class TransformXSLT extends TransformSpi {
/** Field implementedTransformURI */
public static final String implementedTransformURI =
Transforms.TRANSFORM_XSLT;
//J-
static final String XSLTSpecNS = "http://www.w3.org/1999/XSL/Transform";
static final String defaultXSLTSpecNSprefix = "xslt";
static final String XSLTSTYLESHEET = "stylesheet";
/**
* Method engineGetURI
*
* @inheritDoc
*/
protected String engineGetURI() {
return implementedTransformURI;
}
/**
* Method enginePerformTransform
*
* @param input the input for this transform
* @return the result of this Transform
* @throws IOException
* @throws TransformationException
*/
protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input)
throws IOException,
TransformationException {
return enginePerformTransform(input,null);
}
protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input,OutputStream baos)
throws IOException,
TransformationException {
try {
Element transformElement = this._transformObject.getElement();
Element _xsltElement =
XMLUtils.selectNode(transformElement.getFirstChild(),
XSLTSpecNS,"stylesheet", 0);
if (_xsltElement == null) {
Object exArgs[] = { "xslt:stylesheet", "Transform" };
throw new TransformationException("xml.WrongContent", exArgs);
}
TransformerFactory tFactory = TransformerFactory.newInstance();
// Process XSLT stylesheets in a secure manner
tFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
/*
* This transform requires an octet stream as input. If the actual
* input is an XPath node-set, then the signature application should
* attempt to convert it to octets (apply Canonical XML]) as described
* in the Reference Processing Model (section 4.3.3.2).
*/
Source xmlSource =
new StreamSource(new ByteArrayInputStream(input.getBytes()));
Source stylesheet;
/*
* This complicated transformation of the stylesheet itself is necessary
* because of the need to get the pure style sheet. If we simply say
* Source stylesheet = new DOMSource(this._xsltElement);
* whereby this._xsltElement is not the rootElement of the Document,
* this causes problems;
* so we convert the stylesheet to byte[] and use this as input stream
*/
{
ByteArrayOutputStream os = new ByteArrayOutputStream();
Transformer transformer = tFactory.newTransformer();
DOMSource source = new DOMSource(_xsltElement);
StreamResult result = new StreamResult(os);
transformer.transform(source, result);
stylesheet =
new StreamSource(new ByteArrayInputStream(os.toByteArray()));
}
Transformer transformer = tFactory.newTransformer(stylesheet);
if (baos==null) {
ByteArrayOutputStream baos1 = new ByteArrayOutputStream();
StreamResult outputTarget = new StreamResult(baos1);
transformer.transform(xmlSource, outputTarget);
return new XMLSignatureInput(baos1.toByteArray());
}
StreamResult outputTarget = new StreamResult(baos);
transformer.transform(xmlSource, outputTarget);
XMLSignatureInput output=new XMLSignatureInput((byte[])null);
output.setOutputStream(baos);
return output;
} catch (XMLSecurityException ex) {
Object exArgs[] = { ex.getMessage() };
throw new TransformationException("generic.EmptyMessage", exArgs, ex);
} catch (TransformerConfigurationException ex) {
Object exArgs[] = { ex.getMessage() };
throw new TransformationException("generic.EmptyMessage", exArgs, ex);
} catch (TransformerException ex) {
Object exArgs[] = { ex.getMessage() };
throw new TransformationException("generic.EmptyMessage", exArgs, ex);
}
}
}