/*
* Copyright (c) 2007-2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
/**
* 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 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.Transform;
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;
static final String XSLTSpecNS = "http://www.w3.org/1999/XSL/Transform";
static final String defaultXSLTSpecNSprefix = "xslt";
static final String XSLTSTYLESHEET = "stylesheet";
private static java.util.logging.Logger log =
java.util.logging.Logger.getLogger(TransformXSLT.class.getName());
/**
* Method engineGetURI
*
* @inheritDoc
*/
protected String engineGetURI() {
return implementedTransformURI;
}
protected XMLSignatureInput enginePerformTransform(
XMLSignatureInput input, OutputStream baos, Transform transformObject
) throws IOException, TransformationException {
try {
Element transformElement = 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, Boolean.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);
// Force Xalan to use \n as line separator on all OSes. This
// avoids OS specific signature validation failures due to line
// separator differences in the transformed output. Unfortunately,
// this is not a standard JAXP property so will not work with non-Xalan
// implementations.
try {
transformer.setOutputProperty("{http://xml.apache.org/xalan}line-separator", "\n");
} catch (Exception e) {
log.log(java.util.logging.Level.WARNING, "Unable to set Xalan line-separator property: " + e.getMessage());
}
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);
}
}
}