SAMLMetadataUtil.java

/*
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 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * 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, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.picketlink.identity.federation.core.saml.v2.util;

import java.security.cert.X509Certificate;

import org.picketlink.identity.federation.core.exceptions.ConfigurationException;
import org.picketlink.identity.federation.core.exceptions.ProcessingException;
import org.picketlink.identity.federation.core.saml.v2.constants.JBossSAMLURIConstants;
import org.picketlink.identity.federation.core.util.XMLSignatureUtil;
import org.picketlink.identity.federation.saml.v2.metadata.KeyDescriptorType;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Deals with SAML2 Metadata
 *
 * @author Anil.Saldhana@redhat.com
 * @since Jan 31, 2011
 */
public class SAMLMetadataUtil {
    /**
     * Get the {@link X509Certificate} from the KeyInfo
     *
     * @param keyDescriptor
     * @return
     * @throws ProcessingException
     * @throws ConfigurationException
     */
    public static X509Certificate getCertificate(KeyDescriptorType keyDescriptor) throws ConfigurationException,
            ProcessingException {
        X509Certificate cert = null;
        Element keyInfo = keyDescriptor.getKeyInfo();
        if (keyInfo != null) {
            NodeList x509DataNodes = keyInfo.getElementsByTagName("X509Data");
            if (x509DataNodes == null || x509DataNodes.getLength() == 0) {
                x509DataNodes = keyInfo.getElementsByTagNameNS(JBossSAMLURIConstants.XMLDSIG_NSURI.get(), "X509Data");
            }

            if (x509DataNodes == null || x509DataNodes.getLength() == 0) {
                x509DataNodes = keyInfo.getElementsByTagName("ds:X509Data");
            }

            if (x509DataNodes != null && x509DataNodes.getLength() > 0) {
                // Choose the first one
                Node x509DataNode = x509DataNodes.item(0);
                NodeList children = x509DataNode.getChildNodes();
                int len = children != null ? children.getLength() : 0;
                for (int i = 0; i < len; i++) {
                    Node nl = children.item(i);
                    if (nl.getNodeName().contains("X509Certificate")) {
                        Node certNode = nl.getFirstChild();
                        String certNodeValue = certNode.getNodeValue();
                        cert = XMLSignatureUtil.getX509CertificateFromKeyInfoString(certNodeValue.replaceAll("\\s", ""));
                        break;
                    }
                }
            }
        }
        return cert;
    }
}