| |
| /* |
| * 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 org.apache.xml.security.transforms.implementations; |
| |
| |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| 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 org.apache.xml.security.exceptions.XMLSecurityException; |
| import org.apache.xml.security.signature.XMLSignatureInput; |
| import org.apache.xml.security.transforms.TransformSpi; |
| import org.apache.xml.security.transforms.TransformationException; |
| import org.apache.xml.security.transforms.Transforms; |
| import org.apache.xml.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(); |
| |
| /* |
| * 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); |
| } |
| } |
| } |