| /* |
| * 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.utils.resolver.implementations; |
| |
| |
| |
| import org.apache.xml.security.signature.XMLSignatureInput; |
| import org.apache.xml.security.utils.IdResolver; |
| import org.apache.xml.security.utils.resolver.ResourceResolverException; |
| import org.apache.xml.security.utils.resolver.ResourceResolverSpi; |
| import org.w3c.dom.Attr; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| |
| |
| /** |
| * This resolver is used for resolving same-document URIs like URI="" of URI="#id". |
| * |
| * @author $Author$ |
| * @see <A HREF="http://www.w3.org/TR/xmldsig-core/#sec-ReferenceProcessingModel">The Reference processing model in the XML Signature spec</A> |
| * @see <A HREF="http://www.w3.org/TR/xmldsig-core/#sec-Same-Document">Same-Document URI-References in the XML Signature spec</A> |
| * @see <A HREF="http://www.ietf.org/rfc/rfc2396.txt">Section 4.2 of RFC 2396</A> |
| */ |
| public class ResolverFragment extends ResourceResolverSpi { |
| |
| /** {@link org.apache.commons.logging} logging facility */ |
| static org.apache.commons.logging.Log log = |
| org.apache.commons.logging.LogFactory.getLog( |
| ResolverFragment.class.getName()); |
| |
| /** |
| * Method engineResolve |
| * |
| * Wird das gleiche Dokument referenziert? |
| * Wird ein anderes Dokument referenziert? |
| * @inheritDoc |
| * @param uri |
| * @param BaseURI |
| * |
| */ |
| public XMLSignatureInput engineResolve(Attr uri, String BaseURI) |
| throws ResourceResolverException |
| { |
| |
| String uriNodeValue = uri.getNodeValue(); |
| Document doc = uri.getOwnerElement().getOwnerDocument(); |
| |
| |
| Node selectedElem = null; |
| if (uriNodeValue.equals("")) { |
| |
| /* |
| * Identifies the node-set (minus any comment nodes) of the XML |
| * resource containing the signature |
| */ |
| |
| log.debug("ResolverFragment with empty URI (means complete document)"); |
| selectedElem = doc; |
| } else { |
| |
| /* |
| * URI="#chapter1" |
| * Identifies a node-set containing the element with ID attribute |
| * value 'chapter1' of the XML resource containing the signature. |
| * XML Signature (and its applications) modify this node-set to |
| * include the element plus all descendents including namespaces and |
| * attributes -- but not comments. |
| */ |
| String id = uriNodeValue.substring(1); |
| |
| // Element selectedElem = doc.getElementById(id); |
| selectedElem = IdResolver.getElementById(doc, id); |
| if (selectedElem==null) { |
| Object exArgs[] = { id }; |
| throw new ResourceResolverException( |
| "signature.Verification.MissingID", exArgs, uri, BaseURI); |
| } |
| if (log.isDebugEnabled()) |
| log.debug("Try to catch an Element with ID " + id + " and Element was " + selectedElem); |
| } |
| |
| XMLSignatureInput result = new XMLSignatureInput(selectedElem); |
| result.setExcludeComments(true); |
| |
| //log.debug("We return a nodeset with " + resultSet.size() + " nodes"); |
| result.setMIMEType("text/xml"); |
| result.setSourceURI((BaseURI != null) ? BaseURI.concat(uri.getNodeValue()) : |
| uri.getNodeValue()); |
| return result; |
| } |
| |
| /** |
| * Method engineCanResolve |
| * @inheritDoc |
| * @param uri |
| * @param BaseURI |
| * |
| */ |
| public boolean engineCanResolve(Attr uri, String BaseURI) { |
| |
| if (uri == null) { |
| log.debug("Quick fail for null uri"); |
| return false; |
| } |
| |
| String uriNodeValue = uri.getNodeValue(); |
| |
| if (uriNodeValue.equals("") |
| || ((uriNodeValue.charAt(0)=='#') |
| &&!uriNodeValue.startsWith("#xpointer("))) { |
| if (log.isDebugEnabled()) |
| log.debug("State I can resolve reference: \"" + uriNodeValue + "\""); |
| return true; |
| } |
| if (log.isDebugEnabled()) |
| log.debug("Do not seem to be able to resolve reference: \"" + uriNodeValue + "\""); |
| return false; |
| } |
| |
| } |