From 32d17447a258188b2d534bcb0bf65a659ba7b7d0 Mon Sep 17 00:00:00 2001 From: mcentner Date: Fri, 29 Aug 2008 12:11:34 +0000 Subject: Initial import. git-svn-id: https://joinup.ec.europa.eu/svn/mocca/trunk@1 8a26b1a7-26f0-462f-b9ef-d0e30c41f5a4 --- .../egiz/bku/slcommands/impl/xsect/DataObject.java | 1006 ++++++++++++++++++++ 1 file changed, 1006 insertions(+) create mode 100644 bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/DataObject.java (limited to 'bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/DataObject.java') diff --git a/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/DataObject.java b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/DataObject.java new file mode 100644 index 00000000..d25f2526 --- /dev/null +++ b/bkucommon/src/main/java/at/gv/egiz/bku/slcommands/impl/xsect/DataObject.java @@ -0,0 +1,1006 @@ +/* +* Copyright 2008 Federal Chancellery Austria and +* Graz University of Technology +* +* 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 at.gv.egiz.bku.slcommands.impl.xsect; + +import iaik.xml.crypto.dom.DOMCryptoContext; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.SequenceInputStream; +import java.io.StringWriter; +import java.io.UnsupportedEncodingException; +import java.net.URISyntaxException; +import java.nio.charset.Charset; +import java.security.InvalidAlgorithmParameterException; +import java.security.NoSuchAlgorithmException; +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import javax.xml.crypto.MarshalException; +import javax.xml.crypto.dom.DOMStructure; +import javax.xml.crypto.dsig.CanonicalizationMethod; +import javax.xml.crypto.dsig.DigestMethod; +import javax.xml.crypto.dsig.Reference; +import javax.xml.crypto.dsig.Transform; +import javax.xml.crypto.dsig.XMLObject; +import javax.xml.crypto.dsig.spec.TransformParameterSpec; +import javax.xml.crypto.dsig.spec.XPathFilter2ParameterSpec; +import javax.xml.crypto.dsig.spec.XPathType; + +import org.apache.commons.logging.Log; +import org.apache.commons.logging.LogFactory; +import org.w3c.dom.DOMConfiguration; +import org.w3c.dom.DOMException; +import org.w3c.dom.Document; +import org.w3c.dom.DocumentFragment; +import org.w3c.dom.Element; +import org.w3c.dom.Node; +import org.w3c.dom.Text; +import org.w3c.dom.bootstrap.DOMImplementationRegistry; +import org.w3c.dom.ls.DOMImplementationLS; +import org.w3c.dom.ls.LSException; +import org.w3c.dom.ls.LSInput; +import org.w3c.dom.ls.LSOutput; +import org.w3c.dom.ls.LSParser; +import org.w3c.dom.ls.LSSerializer; + +import at.buergerkarte.namespaces.securitylayer._1.Base64XMLLocRefOptRefContentType; +import at.buergerkarte.namespaces.securitylayer._1.DataObjectInfoType; +import at.buergerkarte.namespaces.securitylayer._1.MetaInfoType; +import at.buergerkarte.namespaces.securitylayer._1.TransformsInfoType; +import at.gv.egiz.bku.binding.HttpUtil; +import at.gv.egiz.bku.slexceptions.SLCommandException; +import at.gv.egiz.bku.slexceptions.SLRequestException; +import at.gv.egiz.bku.slexceptions.SLRuntimeException; +import at.gv.egiz.bku.utils.urldereferencer.StreamData; +import at.gv.egiz.bku.utils.urldereferencer.URLDereferencer; +import at.gv.egiz.dom.DOMUtils; +import at.gv.egiz.slbinding.impl.XMLContentType; + +/** + * This class represents a DataObject of an XML-Signature + * created by the security layer command CreateXMLSignature. + * + * @author mcentner + */ +public class DataObject { + + /** + * Logging facility. + */ + private static Log log = LogFactory.getLog(DataObject.class); + + /** + * DOM Implementation. + */ + private static final String DOM_LS_3_0 = "LS 3.0"; + + /** + * The array of the default preferred MIME type order. + */ + private static final String[] DEFAULT_PREFFERED_MIME_TYPES = + new String[] { + "application/xhtml+xml", + "text/plain" + }; + + /** + * The DOM implementation used. + */ + private DOMImplementationLS domImplLS; + + /** + * The signature context. + */ + private SignatureContext ctx; + + /** + * The Reference for this DataObject. + */ + private XSECTReference reference; + + /** + * The XMLObject for this DataObject. + */ + private XMLObject xmlObject; + + /** + * The MIME-Type of the digest input. + */ + private String mimeType; + + /** + * An optional description of the digest input. + */ + private String description; + + /** + * Creates a new instance. + * + * @param document the document of the target signature + */ + public DataObject(SignatureContext signatureContext) { + this.ctx = signatureContext; + + DOMImplementationRegistry registry; + try { + registry = DOMImplementationRegistry.newInstance(); + } catch (Exception e) { + log.error("Failed to get DOMImplementationRegistry.", e); + throw new SLRuntimeException("Failed to get DOMImplementationRegistry."); + } + + domImplLS = (DOMImplementationLS) registry.getDOMImplementation(DOM_LS_3_0); + if (domImplLS == null) { + log.error("Failed to get DOMImplementation " + DOM_LS_3_0); + throw new SLRuntimeException("Failed to get DOMImplementation " + DOM_LS_3_0); + } + + } + + /** + * @return the reference + */ + public Reference getReference() { + return reference; + } + + /** + * @return the xmlObject + */ + public XMLObject getXmlObject() { + return xmlObject; + } + + /** + * @return the mimeType + */ + public String getMimeType() { + return mimeType; + } + + /** + * @return the description + */ + public String getDescription() { + return description; + } + + /** + * Configures this DataObject with the information provided within the given + * sl:DataObjectInfo. + * + * @param dataObjectInfo + * the sl:DataObjectInfo + * + * @throws SLCommandException + * if configuring this DataObject with the information provided in + * the sl:DataObjectInfo fails. + * @throws SLRequestException + * if the information provided in the sl:DataObjectInfo + * does not conform to the security layer specification. + * @throws NullPointerException + * if dataObjectInfo is null + */ + public void setDataObjectInfo(DataObjectInfoType dataObjectInfo) throws SLCommandException, SLRequestException { + + Base64XMLLocRefOptRefContentType dataObject = dataObjectInfo.getDataObject(); + String structure = dataObjectInfo.getStructure(); + + // select and unmarshal an appropriate transformation path if provided + // and set the final data meta information + XSECTTransforms transforms = createTransformsAndSetFinalDataMetaInfo(dataObjectInfo.getTransformsInfo()); + + if ("enveloping".equals(structure)) { + + // configure this DataObject as an enveloped DataObject + setEnvelopedDataObject(dataObject, transforms); + + } else if ("detached".equals(structure)) { + + // configure this DataObject as an detached DataObject + setDetachedDataObject(dataObject, transforms); + + } + // other values are not allowed by the schema and are therefore ignored + + } + + /** + * Configures this DataObject as an enveloped DataObject with the information + * provided within the given sl:DataObject. + * + * @param dataObject + * the sl:DataObject + * @param transforms + * an optional Transforms element (may be + * null) + * + * @throws SLCommandException + * if configuring this DataObject with the information provided in + * the sl:DataObject fails. + * @throws SLRequestException + * if the information provided in the sl:DataObject + * does not conform to the security layer specification. + * @throws NullPointerException + * if dataObject is null + */ + private void setEnvelopedDataObject( + Base64XMLLocRefOptRefContentType dataObject, XSECTTransforms transforms) + throws SLCommandException, SLRequestException { + + String reference = dataObject.getReference(); + if (reference == null) { + // + // case A + // + // The Reference attribute is not used; the content of sl:DataObject represents the data object. + // If the data object is XML-coded (the sl:XMLContent element is used in sl:DataObject), then it + // must be incorporated in the signature structure as parsed XML. + // + + if (dataObject.getBase64Content() != null) { + + log.debug("Adding DataObject (Base64Content) without a reference URI."); + + // create XMLObject + XMLObject xmlObject = createXMLObject(new ByteArrayInputStream(dataObject.getBase64Content())); + + setXMLObjectAndReferenceBase64(xmlObject, transforms); + + } else if (dataObject.getXMLContent() != null) { + + log.debug("Adding DataObject (XMLContent) without a reference URI."); + + // create XMLObject + DocumentFragment content = parseDataObject((XMLContentType) dataObject.getXMLContent()); + XMLObject xmlObject = createXMLObject(content); + + setXMLObjectAndReferenceXML(xmlObject, transforms); + + } else if (dataObject.getLocRefContent() != null) { + + log.debug("Adding DataObject (LocRefContent) without a reference URI."); + + setEnvelopedDataObject(dataObject.getLocRefContent(), transforms); + + } else { + + // not allowed + log.info("XML structure of the command request contains an " + + "invalid combination of optional elements or attributes. " + + "DataObject of structure='enveloped' without a reference must contain content."); + throw new SLRequestException(3003); + + } + + } else { + + if (dataObject.getBase64Content() == null && + dataObject.getXMLContent() == null && + dataObject.getLocRefContent() == null) { + + // + // case B + // + // The Reference attribute contains a URI that must be resolved by the + // Citizen Card Environment to obtain the data object. + // The content of sl:DataObject remains empty + // + + log.debug("Adding DataObject from reference URI '" + reference + "'."); + + setEnvelopedDataObject(reference, transforms); + + } else { + + // not allowed + log.info("XML structure of the command request contains an " + + "invalid combination of optional elements or attributes. " + + "DataObject of structure='enveloped' with reference must not contain content."); + throw new SLRequestException(3003); + + } + + + } + + } + + /** + * Configures this DataObject as an enveloped DataObject with the content to + * be dereferenced from the given reference. + * + * @param reference + * the reference URI + * @param transforms + * an optional Transforms element (may be + * null) + * + * @throws SLCommandException + * if dereferencing the given reference fails, or if + * configuring this DataObject with the data dereferenced from the + * given reference fails. + * @throws NullPointerException + * if reference is null + */ + private void setEnvelopedDataObject(String reference, XSECTTransforms transforms) throws SLCommandException { + + if (reference == null) { + throw new NullPointerException("Argument 'reference' must not be null."); + } + + // dereference URL + URLDereferencer dereferencer = URLDereferencer.getInstance(); + + StreamData streamData; + try { + streamData = dereferencer.dereference(reference, ctx.getDereferencerContext()); + } catch (IOException e) { + log.info("Failed to dereference XMLObject from '" + reference + "'.", e); + throw new SLCommandException(4110); + } + + Node childNode; + + String contentType = streamData.getContentType(); + if (contentType.startsWith("text/xml")) { + + // If content type is text/xml parse content. + String charset = HttpUtil.getCharset(contentType, true); + + Document doc = parseDataObject(streamData.getStream(), charset); + + childNode = doc.getDocumentElement(); + + if (childNode == null) { + log.info("Failed to parse XMLObject from '" + reference + "'."); + throw new SLCommandException(4111); + } + + XMLObject xmlObject = createXMLObject(childNode); + + setXMLObjectAndReferenceXML(xmlObject, transforms); + + } else { + + // Include content Base64 encoded. + XMLObject xmlObject = createXMLObject(streamData.getStream()); + + setXMLObjectAndReferenceBase64(xmlObject, transforms); + + } + + } + + /** + * Configures this DataObject as an detached DataObject with the information + * provided in the given sl:DataObject and optionally + * transforms. + * + * @param dataObject + * the sl:DataObject + * @param transforms + * an optional Transforms object, may be null + * + * @throws SLCommandException + * if configuring this DataObject with the information provided in + * the sl:DataObject fails. + * @throws SLRequestException + * if the information provided in the sl:DataObject + * does not conform to the security layer specification. + * @throws NullPointerException + * if dataObject is null + */ + private void setDetachedDataObject( + Base64XMLLocRefOptRefContentType dataObject, XSECTTransforms transforms) + throws SLCommandException, SLRequestException { + + String referenceURI = dataObject.getReference(); + + if (referenceURI == null) { + + // not allowed + log.info("XML structure of the command request contains an " + + "invalid combination of optional elements or attributes. " + + "DataObject of structure='detached' must contain a reference."); + throw new SLRequestException(3003); + + } else { + + DigestMethod dm; + try { + dm = ctx.getAlgorithmMethodFactory().createDigestMethod(ctx); + } catch (NoSuchAlgorithmException e) { + log.error("Failed to get DigestMethod.", e); + throw new SLCommandException(4006); + } catch (InvalidAlgorithmParameterException e) { + log.error("Failed to get DigestMethod.", e); + throw new SLCommandException(4006); + } + + String idValue = ctx.getIdValueFactory().createIdValue("Reference"); + + reference = new XSECTReference(referenceURI, dm, transforms, null, idValue); + + // case D: + // + // The Reference attribute contains a URI that is used by the Citizen Card + // Environment to code the reference to the data object as part of the XML + // signature (attribute URI in the dsig:Reference) element. The content of + // sl:DataObject represents the data object. + + if (dataObject.getLocRefContent() != null) { + String locRef = dataObject.getLocRefContent(); + try { + this.reference.setDereferencer(new LocRefDereferencer(ctx.getDereferencerContext(), locRef)); + } catch (URISyntaxException e) { + log.info("Invalid URI '" + locRef + "' in DataObject.", e); + throw new SLCommandException(4003); + } catch (IllegalArgumentException e) { + log.info("LocRef URI of '" + locRef + "' not supported in DataObject. ", e); + throw new SLCommandException(4003); + } + } else if (dataObject.getBase64Content() != null) { + byte[] base64Content = dataObject.getBase64Content(); + this.reference.setDereferencer(new ByteArrayDereferencer(base64Content)); + } else if (dataObject.getXMLContent() != null) { + XMLContentType xmlContent = (XMLContentType) dataObject.getXMLContent(); + byte[] bytes = xmlContent.getRedirectedStream().toByteArray(); + this.reference.setDereferencer(new ByteArrayDereferencer(bytes)); + } else { + + // case C: + // + // The Reference attribute contains a URI that must be resolved by the + // Citizen Card Environment to obtain the data object. The Reference + // attribute contains a URI that is used by the Citizen Card Environment + // to code the reference to the data object as part of the XML signature + // (attribute URI in the dsig:Reference) element. The content of + // sl:DataObject remains empty. + + } + + } + } + + /** + * Returns the preferred sl:TransformInfo from the given list of + * transformInfos, or null if none of the given + * transformInfos is preferred over the others. + * + * @param transformsInfos + * a list of sl:TransformInfos + * + * @return the selected sl:TransformInfo or null, if + * none is preferred over the others + */ + private TransformsInfoType selectPreferredTransformsInfo(List transformsInfos) { + + Map mimeTypes = new HashMap(); + + StringBuilder debugString = null; + if (log.isDebugEnabled()) { + debugString = new StringBuilder(); + debugString.append("Got " + transformsInfos.size() + " TransformsInfo(s):"); + } + + for (TransformsInfoType transformsInfoType : transformsInfos) { + MetaInfoType finalDataMetaInfo = transformsInfoType.getFinalDataMetaInfo(); + String mimeType = finalDataMetaInfo.getMimeType(); + String description = finalDataMetaInfo.getDescription(); + mimeTypes.put(mimeType, transformsInfoType); + if (debugString != null) { + debugString.append("\n FinalDataMetaInfo: MIME-Type="); + debugString.append(mimeType); + if (description != null) { + debugString.append(" "); + debugString.append(description); + } + } + } + + if (debugString != null) { + log.debug(debugString); + } + + // look for preferred transform + for (String mimeType : DEFAULT_PREFFERED_MIME_TYPES) { + if (mimeTypes.containsKey(mimeType)) { + return mimeTypes.get(mimeType); + } + } + + // no preferred transform + return null; + + } + + /** + * Create an instance of ds:Transforms from the given + * sl:TransformsInfo. + * + * @param transformsInfo + * the sl:TransformsInfo + * + * @return a corresponding unmarshalled ds:Transforms, or + * null if the given sl:TransformsInfo does + * not contain a dsig:Transforms element + * + * @throws SLRequestException + * if the ds:Transforms in the given + * transformsInfo are not valid or cannot be parsed. + * + * @throws MarshalException + * if the ds:Transforms in the given + * transformsInfo cannot be unmarshalled. + */ + private XSECTTransforms createTransforms(TransformsInfoType transformsInfo) throws SLRequestException, MarshalException { + + ByteArrayOutputStream redirectedStream = ((at.gv.egiz.slbinding.impl.TransformsInfoType) transformsInfo).getRedirectedStream(); + byte[] transformBytes = (redirectedStream != null) ? redirectedStream.toByteArray() : null; + + if (transformBytes != null && transformBytes.length > 0) { + + // debug + if (log.isTraceEnabled()) { + StringBuilder sb = new StringBuilder(); + sb.append("Trying to parse transforms:\n"); + sb.append(new String(transformBytes, Charset.forName("UTF-8"))); + log.trace(sb); + } + + DOMImplementationLS domImplLS = DOMUtils.getDOMImplementationLS(); + LSInput input = domImplLS.createLSInput(); + input.setByteStream(new ByteArrayInputStream(transformBytes)); + + LSParser parser = domImplLS.createLSParser( + DOMImplementationLS.MODE_SYNCHRONOUS, null); + DOMConfiguration domConfig = parser.getDomConfig(); + SimpleDOMErrorHandler errorHandler = new SimpleDOMErrorHandler(); + domConfig.setParameter("error-handler", errorHandler); + domConfig.setParameter("validate", Boolean.FALSE); + + Document document; + try { + document = parser.parse(input); + } catch (DOMException e) { + log.info("Failed to parse dsig:Transforms.", e); + throw new SLRequestException(3002); + } catch (LSException e) { + log.info("Failed to parse dsig:Transforms.", e); + throw new SLRequestException(3002); + } + + // adopt ds:Transforms + Element documentElement = document.getDocumentElement(); + Node adoptedTransforms = ctx.getDocument().adoptNode(documentElement); + + DOMCryptoContext context = new DOMCryptoContext(); + + // unmarshall ds:Transforms + return new XSECTTransforms(context, adoptedTransforms); + + } else { + return null; + } + + } + + /** + * Sets the mimeType and the description value + * for this DataObject. + * + * @param metaInfoType the sl:FinalMetaDataInfo + * + * @throws NullPointerException if metaInfoType is null + */ + private void setFinalDataMetaInfo(MetaInfoType metaInfoType) { + + this.mimeType = metaInfoType.getMimeType(); + this.description = metaInfoType.getDescription(); + + } + + /** + * Selects an appropriate transformation path (if present) from the given list + * of sl:TransformInfos, sets the corresponding final data meta info and + * returns the corresponding unmarshalled ds:Transforms. + * + * @param transformsInfos the sl:TransformInfos + * + * @return the unmarshalled ds:Transforms, or null if + * no transformation path has been selected. + * + * @throws SLRequestException if the given list ds:TransformsInfo contains + * an invalid ds:Transforms element, or no suitable transformation path + * can be found. + */ + private XSECTTransforms createTransformsAndSetFinalDataMetaInfo( + List transformsInfos) throws SLRequestException { + + TransformsInfoType preferredTransformsInfo = selectPreferredTransformsInfo(transformsInfos); + // try preferred transform + if (preferredTransformsInfo != null) { + + try { + XSECTTransforms transforms = createTransforms(preferredTransformsInfo); + setFinalDataMetaInfo(preferredTransformsInfo.getFinalDataMetaInfo()); + return transforms; + } catch (MarshalException e) { + + String mimeType = preferredTransformsInfo.getFinalDataMetaInfo().getMimeType(); + log.info("Failed to unmarshal preferred transformation path (MIME-Type=" + + mimeType + ").", e); + + } + + } + + // look for another suitable transformation path + for (TransformsInfoType transformsInfoType : transformsInfos) { + + try { + XSECTTransforms transforms = createTransforms(transformsInfoType); + setFinalDataMetaInfo(transformsInfoType.getFinalDataMetaInfo()); + return transforms; + } catch (MarshalException e) { + + String mimeType = transformsInfoType.getFinalDataMetaInfo().getMimeType(); + log.info("Failed to unmarshal transformation path (MIME-Type=" + + mimeType + ").", e); + } + + } + + // no suitable transformation path found + throw new SLRequestException(3003); + + } + + /** + * Create an XMLObject with the Base64 encoding of the given + * content. + * + * @param content + * the to-be Base64 encoded content + * @return an XMLObject with the Base64 encoded content + */ + private XMLObject createXMLObject(InputStream content) { + + Text textNode; + try { + textNode = at.gv.egiz.dom.DOMUtils.createBase64Text(content, ctx.getDocument()); + } catch (IOException e) { + log.error(e); + throw new SLRuntimeException(e); + } + + DOMStructure structure = new DOMStructure(textNode); + + String idValue = ctx.getIdValueFactory().createIdValue("Object"); + + return ctx.getSignatureFactory().newXMLObject(Collections.singletonList(structure), idValue, null, null); + + } + + /** + * Create an XMLObject with the given content node. + * + * @param content the content node + * + * @return an XMLObject with the given content + */ + private XMLObject createXMLObject(Node content) { + + String idValue = ctx.getIdValueFactory().createIdValue("Object"); + + List structures = Collections.singletonList(new DOMStructure(content)); + + return ctx.getSignatureFactory().newXMLObject(structures, idValue, null, null); + + } + + /** + * Sets the given xmlObject and creates and sets a corresponding + * Reference. + *

+ * A transform to Base64-decode the xmlObject's content is inserted at the top + * of to the optional transforms if given, or to a newly created + * Transforms element if transforms is + * null. + * + * @param xmlObject + * the XMLObject + * @param transforms + * an optional Transforms element (may be + * null) + * + * @throws SLCommandException + * if creating the Reference fails + * @throws NullPointerException + * if xmlObject is null + */ + private void setXMLObjectAndReferenceBase64(XMLObject xmlObject, XSECTTransforms transforms) throws SLCommandException { + + // create reference URI + // + // NOTE: the ds:Object can be referenced directly, as the Base64 transform + // operates on the text() of the input nodelist. + // + String referenceURI = "#" + xmlObject.getId(); + + // create Base64 Transform + Transform transform; + try { + transform = ctx.getSignatureFactory().newTransform(Transform.BASE64, (TransformParameterSpec) null); + } catch (NoSuchAlgorithmException e) { + // algorithm must be present + throw new SLRuntimeException(e); + } catch (InvalidAlgorithmParameterException e) { + // algorithm does not take parameters + throw new SLRuntimeException(e); + } + + if (transforms == null) { + transforms = new XSECTTransforms(Collections.singletonList(transform)); + } else { + transforms.insertTransform(transform); + } + + DigestMethod dm; + try { + dm = ctx.getAlgorithmMethodFactory().createDigestMethod(ctx); + } catch (NoSuchAlgorithmException e) { + log.error("Failed to get DigestMethod.", e); + throw new SLCommandException(4006); + } catch (InvalidAlgorithmParameterException e) { + log.error("Failed to get DigestMethod.", e); + throw new SLCommandException(4006); + } + String id = ctx.getIdValueFactory().createIdValue("Reference"); + + this.xmlObject = xmlObject; + this.reference = new XSECTReference(referenceURI, dm, transforms, null, id); + + } + + /** + * Sets the given xmlObject and creates and sets a corresponding + * Reference. + *

+ * A transform to select the xmlObject's content is inserted at the top of to + * the optional transforms if given, or to a newly created + * Transforms element if transforms is + * null. + *

+ * + * @param xmlObject + * the XMLObject + * @param transforms + * an optional Transforms element (may be + * null) + * + * @throws SLCommandException + * if creating the Reference fails + * @throws NullPointerException + * if xmlObject is null + */ + private void setXMLObjectAndReferenceXML(XMLObject xmlObject, XSECTTransforms transforms) throws SLCommandException { + + // create reference URI + String referenceURI = "#" + xmlObject.getId(); + + // create Transform to select ds:Object's children + Transform xpathTransform; + Transform c14nTransform; + try { + + XPathType xpath = new XPathType("id(\"" + xmlObject.getId() + "\")/node()", XPathType.Filter.INTERSECT); + List xpaths = Collections.singletonList(xpath); + XPathFilter2ParameterSpec params = new XPathFilter2ParameterSpec(xpaths); + + xpathTransform = ctx.getSignatureFactory().newTransform(Transform.XPATH2, params); + + // add exclusive canonicalization to avoid signing the namespace context of the ds:Object + c14nTransform = ctx.getSignatureFactory().newTransform(CanonicalizationMethod.EXCLUSIVE, (TransformParameterSpec) null); + + } catch (NoSuchAlgorithmException e) { + // algorithm must be present + throw new SLRuntimeException(e); + } catch (InvalidAlgorithmParameterException e) { + // params must be appropriate + throw new SLRuntimeException(e); + } + + if (transforms == null) { + List newTransfroms = new ArrayList(); + newTransfroms.add(xpathTransform); + newTransfroms.add(c14nTransform); + transforms = new XSECTTransforms(newTransfroms); + } else { + transforms.insertTransform(xpathTransform); + } + + DigestMethod dm; + try { + dm = ctx.getAlgorithmMethodFactory().createDigestMethod(ctx); + } catch (NoSuchAlgorithmException e) { + log.error("Failed to get DigestMethod.", e); + throw new SLCommandException(4006); + } catch (InvalidAlgorithmParameterException e) { + log.error("Failed to get DigestMethod.", e); + throw new SLCommandException(4006); + } + String id = ctx.getIdValueFactory().createIdValue("Reference"); + + this.xmlObject = xmlObject; + this.reference = new XSECTReference(referenceURI, dm, transforms, null, id); + + } + + /** + * Parses the given xmlContent and returns a corresponding + * document fragment. + * + *

+ * The to-be parsed content is surrounded by ... elements to + * allow for mixed (e.g. Text and Element) content in XMLContent. + *

+ * + * @param xmlContent + * the XMLContent to-be parsed + * + * @return a document fragment containing the parsed nodes + * + * @throws SLCommandException + * if parsing the given xmlContent fails + * + * @throws NullPointerException + * if xmlContent is null + */ + private DocumentFragment parseDataObject(XMLContentType xmlContent) throws SLCommandException { + + ByteArrayOutputStream redirectedStream = xmlContent.getRedirectedStream(); + + // Note: We can assume a fixed character encoding of UTF-8 for the + // content of the redirect stream as the content has already been parsed + // and serialized again to the redirect stream. + + List inputStreams = new ArrayList(); + try { + // dummy start element + inputStreams.add(new ByteArrayInputStream("".getBytes("UTF-8"))); + + // content + inputStreams.add(new ByteArrayInputStream(redirectedStream.toByteArray())); + + // dummy end element + inputStreams.add(new ByteArrayInputStream("".getBytes("UTF-8"))); + } catch (UnsupportedEncodingException e) { + throw new SLRuntimeException(e); + } + + SequenceInputStream inputStream = new SequenceInputStream(Collections.enumeration(inputStreams)); + + // parse DataObject + Document doc = parseDataObject(inputStream, "UTF-8"); + + Element documentElement = doc.getDocumentElement(); + + if (documentElement == null || + !"dummy".equals(documentElement.getLocalName())) { + log.info("Failed to parse DataObject XMLContent."); + throw new SLCommandException(4111); + } + + DocumentFragment fragment = doc.createDocumentFragment(); + while (documentElement.getFirstChild() != null) { + fragment.appendChild(documentElement.getFirstChild()); + } + + // log parsed document + if (log.isTraceEnabled()) { + + StringWriter writer = new StringWriter(); + + writer.write("DataObject:\n"); + + LSOutput output = domImplLS.createLSOutput(); + output.setCharacterStream(writer); + output.setEncoding("UTF-8"); + LSSerializer serializer = domImplLS.createLSSerializer(); + serializer.getDomConfig().setParameter("xml-declaration", Boolean.FALSE); + serializer.write(fragment, output); + + log.trace(writer.toString()); + } + + return fragment; + + } + + /** + * Parses the given inputStream using the given + * encoding and returns the parsed document. + * + * @param inputStream + * the to-be parsed input + * + * @param encoding + * the encoding to be used for parsing the given + * inputStream + * + * @return the parsed document + * + * @throws SLCommandException + * if parsing the inputStream fails. + * + * @throws NullPointerException + * if inputStram is null + */ + private Document parseDataObject(InputStream inputStream, String encoding) throws SLCommandException { + + LSInput input = domImplLS.createLSInput(); + input.setByteStream(inputStream); + + if (encoding != null) { + input.setEncoding(encoding); + } + + LSParser parser = domImplLS.createLSParser(DOMImplementationLS.MODE_SYNCHRONOUS, null); + DOMConfiguration domConfig = parser.getDomConfig(); + SimpleDOMErrorHandler errorHandler = new SimpleDOMErrorHandler(); + domConfig.setParameter("error-handler", errorHandler); + domConfig.setParameter("validate", Boolean.FALSE); + + Document doc; + try { + doc = parser.parse(input); + } catch (DOMException e) { + log.info("Existing XML document cannot be parsed.", e); + throw new SLCommandException(4111); + } catch (LSException e) { + log.info("Existing XML document cannot be parsed. ", e); + throw new SLCommandException(4111); + } + + if (errorHandler.hasErrors()) { + // log errors + if (log.isInfoEnabled()) { + List errorMessages = errorHandler.getErrorMessages(); + StringBuffer sb = new StringBuffer(); + for (String errorMessage : errorMessages) { + sb.append(" "); + sb.append(errorMessage); + } + log.info("Existing XML document cannot be parsed. " + sb.toString()); + } + throw new SLCommandException(4111); + } + + return doc; + + } + + +} -- cgit v1.2.3