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/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 2005 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.
*
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
*/
/*
* $Id: DOMURIDereferencer.java,v 1.2 2008/07/24 15:20:32 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
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);
}
}
}
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