be.fedict.eid.dss.document.zip.ZIPResourceResolver.java Source code

Introduction

Here is the source code for be.fedict.eid.dss.document.zip.ZIPResourceResolver.java

Source

/*
 * eID Digital Signature Service Project.
 * Copyright (C) 2011 Frank Cornelis.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version
 * 3.0 as published by the Free Software Foundation.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, see 
 * http://www.gnu.org/licenses/.
 */

package be.fedict.eid.dss.document.zip;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.utils.resolver.ResourceResolverException;
import org.apache.xml.security.utils.resolver.ResourceResolverSpi;
import org.w3c.dom.Attr;

public class ZIPResourceResolver extends ResourceResolverSpi {

    private static final Log LOG = LogFactory.getLog(ZIPResourceResolver.class);

    private final byte[] document;

    public ZIPResourceResolver(byte[] document) {
        this.document = document;
    }

    @Override
    public boolean engineCanResolve(Attr uri, String baseUri) {
        LOG.debug("engineCanResolve: " + uri.getValue());
        try {
            if (null != findZIPEntry(uri)) {
                return true;
            }
        } catch (IOException e) {
            LOG.error("IO error: " + e.getMessage(), e);
            return false;
        }
        /*
         * We claim we can resolve em all.
         */
        return true;
    }

    @Override
    public XMLSignatureInput engineResolve(Attr uri, String baseUri) throws ResourceResolverException {
        LOG.debug("engineResolve: " + uri.getValue());
        InputStream inputStream;
        try {
            inputStream = findZIPEntry(uri);
        } catch (IOException e) {
            throw new ResourceResolverException("IO error: " + e.getMessage(), e, uri, baseUri);
        }
        XMLSignatureInput signatureInput = new XMLSignatureInput(inputStream);
        return signatureInput;
    }

    private InputStream findZIPEntry(Attr dsReferenceUri) throws IOException {
        String entryName = dsReferenceUri.getValue();
        ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(this.document));
        ZipEntry zipEntry;
        while (null != (zipEntry = zipInputStream.getNextEntry())) {
            if (entryName.equals(zipEntry.getName())) {
                return zipInputStream;
            }
        }
        return null;
    }
}