/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
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* modification, are permitted provided that the following conditions
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* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
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* not be used to endorse or promote products derived from this
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Institute for
* Data Communications Systems, <http://www.nue.et-inf.uni-siegen.de/>.
* The development of this software was partly funded by the European
* Commission in the <WebSig> project in the ISIS Programme.
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package org.apache.xml.security.utils.resolver.implementations;
import java.io.*;
import java.net.URL;
import org.w3c.dom.*;
import org.apache.xml.utils.URI;
import org.apache.xml.security.utils.resolver.ResourceResolverException;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.utils.resolver.ResourceResolverSpi;
/**
* A simple ResourceResolver for requests into the local filesystem.
*
* @author $Author: geuerp $
*/
public class ResolverLocalFilesystem extends ResourceResolverSpi {
/** {@link org.apache.log4j} logging facility */
static org.apache.log4j.Category cat =
org.apache.log4j.Category
.getInstance(ResolverLocalFilesystem.class.getName());
/**
* Method resolve
*
* @param uri
* @param BaseURI
* @return
* @throws ResourceResolverException
* @todo calculate the correct URI from the attribute and the BaseURI
*/
public XMLSignatureInput engineResolve(Attr uri, String BaseURI)
throws ResourceResolverException {
try {
URI uriNew = new URI(new URI(BaseURI), uri.getNodeValue());
// if the URI contains a fragment, ignore it
URI uriNewNoFrag = new URI(uriNew);
uriNewNoFrag.setFragment(null);
String fileName =
ResolverLocalFilesystem
.translateUriToFilename(uriNewNoFrag.toString());
FileInputStream inputStream = new FileInputStream(fileName);
XMLSignatureInput result = new XMLSignatureInput(inputStream);
result.setSourceURI(uriNew.toString());
return result;
} catch (Exception e) {
throw new ResourceResolverException("generic.EmptyMessage", e, uri,
BaseURI);
}
}
/**
* Method translateUriToFilename
*
* @param uri
* @return
*/
private static String translateUriToFilename(String uri) {
String subStr = uri.substring("file:/".length());
subStr.replace('/', java.io.File.separatorChar);
if (subStr.charAt(1) == ':') {
// we're running M$ Windows, so this works fine
return subStr;
} else {
// we're running some UNIX, so we have to prepend a slash
return "/" + subStr;
}
}
/**
* Method engineCanResolve
*
* @param uri
* @param BaseURI
* @return
*/
public boolean engineCanResolve(Attr uri, String BaseURI) {
if (uri == null) {
return false;
}
String uriNodeValue = uri.getNodeValue();
if (uriNodeValue.equals("") || uriNodeValue.startsWith("#")) {
return false;
}
try {
URI uriNew = new URI(new URI(BaseURI), uri.getNodeValue());
cat.debug("I was asked whether I can resolve " + uriNew.toString());
if (uriNew.getScheme().equals("file")) {
cat.debug("I state that I can resolve " + uriNew.toString());
return true;
}
} catch (Exception e) {}
cat.debug("But I can't");
return false;
}
}