/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* $Id: DOMURIDereferencer.java,v 1.19 2005/09/23 20:09:34 mullan Exp $
*/
package org.jcp.xml.dsig.internal.dom;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import com.sun.org.apache.xml.internal.security.Init;
import com.sun.org.apache.xml.internal.security.utils.IdResolver;
import com.sun.org.apache.xml.internal.security.utils.resolver.ResourceResolver;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import javax.xml.crypto.*;
import javax.xml.crypto.dom.*;
import javax.xml.crypto.dsig.*;
/**
* DOM-based implementation of URIDereferencer.
*
* @author Sean Mullan
*/
public class DOMURIDereferencer implements URIDereferencer {
static final URIDereferencer INSTANCE = new DOMURIDereferencer();
private DOMURIDereferencer() {
// need to call com.sun.org.apache.xml.internal.security.Init.init()
// before calling any apache security code
Init.init();
}
public Data dereference(URIReference uriRef, XMLCryptoContext context)
throws URIReferenceException {
if (uriRef == null) {
throw new NullPointerException("uriRef cannot be null");
}
if (context == null) {
throw new NullPointerException("context cannot be null");
}
DOMURIReference domRef = (DOMURIReference) uriRef;
Attr uriAttr = (Attr) domRef.getHere();
String uri = uriRef.getURI();
DOMCryptoContext dcc = (DOMCryptoContext) context;
// Check if same-document URI and register ID
if (uri != null && uri.length() != 0 && uri.charAt(0) == '#') {
String id = uri.substring(1);
if (id.startsWith("xpointer(id(")) {
int i1 = id.indexOf('\'');
int i2 = id.indexOf('\'', i1+1);
id = id.substring(i1+1, i2);
}
// this is a bit of a hack to check for registered
// IDRefs and manually register them with Apache's IdResolver
// map which includes builtin schema knowledge of DSig/Enc IDs
if (context instanceof XMLSignContext) {
Node referencedElem = dcc.getElementById(id);
if (referencedElem != null) {
IdResolver.registerElementById((Element) referencedElem, id);
}
}
}
try {
String baseURI = context.getBaseURI();
ResourceResolver apacheResolver =
ResourceResolver.getInstance(uriAttr, baseURI);
XMLSignatureInput in = apacheResolver.resolve(uriAttr, baseURI);
if (in.isOctetStream()) {
return new ApacheOctetStreamData(in);
} else {
return new ApacheNodeSetData(in);
}
} catch (Exception e) {
throw new URIReferenceException(e);
}
}
}