/*
* 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 com.sun.org.apache.xml.internal.security.utils.resolver.implementations;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import com.sun.org.apache.xml.internal.security.utils.IdResolver;
import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolverException;
import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolverSpi;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
/**
* Handles barename XPointer Reference URIs.
* <BR />
* To retain comments while selecting an element by an identifier ID,
* use the following full XPointer: URI='#xpointer(id('ID'))'.
* <BR />
* To retain comments while selecting the entire document,
* use the following full XPointer: URI='#xpointer(/)'.
* This XPointer contains a simple XPath expression that includes
* the root node, which the second to last step above replaces with all
* nodes of the parse tree (all descendants, plus all attributes,
* plus all namespaces nodes).
*
* @author $Author: dims $
*/
public class ResolverXPointer extends ResourceResolverSpi {
/** {@link java.util.logging} logging facility */
static java.util.logging.Logger log =
java.util.logging.Logger.getLogger(
ResolverXPointer.class.getName());
/**
* @inheritDoc
*/
public XMLSignatureInput engineResolve(Attr uri, String BaseURI)
throws ResourceResolverException {
Node resultNode = null;
Document doc = uri.getOwnerElement().getOwnerDocument();
String uriStr=uri.getNodeValue();
if (isXPointerSlash(uriStr)) {
resultNode = doc;
} else if (isXPointerId(uriStr)) {
String id = getXPointerId(uriStr);
resultNode =IdResolver.getElementById(doc, id);
// if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "Use #xpointer(id('" + id + "')) on element " + selectedElem);
if (resultNode == null) {
Object exArgs[] = { id };
throw new ResourceResolverException(
"signature.Verification.MissingID", exArgs, uri, BaseURI);
}
/*
resultNodes =
cXPathAPI
.selectNodeList(selectedElem, Canonicalizer
.XPATH_C14N_WITH_COMMENTS_SINGLE_NODE);*/
}
XMLSignatureInput result = new XMLSignatureInput(resultNode);
result.setMIMEType("text/xml");
if (BaseURI != null && BaseURI.length() > 0) {
result.setSourceURI(BaseURI.concat(uri.getNodeValue()));
} else {
result.setSourceURI(uri.getNodeValue());
}
return result;
}
/**
* @inheritDoc
*/
public boolean engineCanResolve(Attr uri, String BaseURI) {
if (uri == null) {
return false;
}
String uriStr =uri.getNodeValue();
if (isXPointerSlash(uriStr) || isXPointerId(uriStr)) {
return true;
}
return false;
}
/**
* Method isXPointerSlash
*
* @param uri
* @return true if begins with xpointer
*/
private static boolean isXPointerSlash(String uri) {
if (uri.equals("#xpointer(/)")) {
return true;
}
return false;
}
private static final String XP="#xpointer(id(";
private static final int XP_LENGTH=XP.length();
/**
* Method isXPointerId
*
* @param uri
* @return it it has an xpointer id
*
*/
private static boolean isXPointerId(String uri) {
if (uri.startsWith(XP)
&& uri.endsWith("))")) {
String idPlusDelim = uri.substring(XP_LENGTH,
uri.length()
- 2);
// if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "idPlusDelim=" + idPlusDelim);
int idLen=idPlusDelim.length() -1;
if (((idPlusDelim.charAt(0) == '"') && (idPlusDelim
.charAt(idLen) == '"')) || ((idPlusDelim
.charAt(0) == '\'') && (idPlusDelim
.charAt(idLen) == '\''))) {
if (true)
if (log.isLoggable(java.util.logging.Level.FINE)) log.log(java.util.logging.Level.FINE, "Id="
+ idPlusDelim.substring(1, idLen));
return true;
}
}
return false;
}
/**
* Method getXPointerId
*
* @param uri
* @return xpointerId to search.
*/
private static String getXPointerId(String uri) {
if (uri.startsWith(XP)
&& uri.endsWith("))")) {
String idPlusDelim = uri.substring(XP_LENGTH,uri.length()
- 2);
int idLen=idPlusDelim.length() -1;
if (((idPlusDelim.charAt(0) == '"') && (idPlusDelim
.charAt(idLen) == '"')) || ((idPlusDelim
.charAt(0) == '\'') && (idPlusDelim
.charAt(idLen) == '\''))) {
return idPlusDelim.substring(1, idLen);
}
}
return null;
}
}