/*
* 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.CachedXPathAPIHolder;
import org.apache.xml.security.utils.IdResolver;
import org.apache.xml.security.utils.resolver.ResourceResolverSpi;
import org.apache.xml.utils.URI;
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: raul $
* @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)
{
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 (log.isDebugEnabled())
log.debug("Try to catch an Element with ID " + id + " and Element was " + selectedElem);
}
//Set resultSet = dereferenceSameDocumentURI(selectedElem);
XMLSignatureInput result = new XMLSignatureInput(selectedElem,new CachedXPathAPIHolder());
result.setExcludeComments(true);
//log.debug("We return a nodeset with " + resultSet.size() + " nodes");
result.setMIMEType("text/xml");
try {
URI uriNew = new URI(new URI(BaseURI), uri.getNodeValue());
result.setSourceURI(uriNew.toString());
} catch (URI.MalformedURIException ex) {
result.setSourceURI(BaseURI);
}
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.startsWith("#")
&&!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;
}
}