com.helger.peppol.as2client.AS2ClientHelper.java Source code

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Here is the source code for com.helger.peppol.as2client.AS2ClientHelper.java

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/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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.
 */
package com.helger.peppol.as2client;

import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;

import org.bouncycastle.asn1.x500.RDN;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.style.BCStyle;
import org.bouncycastle.asn1.x500.style.IETFUtils;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;

import com.helger.commons.ValueEnforcer;

/**
 * Common functionality for AS2 clients
 *
 * @author Philip Helger
 */
@Immutable
public final class AS2ClientHelper {
    private AS2ClientHelper() {
    }

    /**
     * @param aCert
     *        Source certificate. May not be <code>null</code>.
     * @return The common name of the certificate subject
     * @throws CertificateEncodingException
     *         In case of an internal error
     */
    @Nonnull
    public static String getSubjectCommonName(@Nonnull final X509Certificate aCert)
            throws CertificateEncodingException {
        ValueEnforcer.notNull(aCert, "Certificate");
        final X500Name x500name = new JcaX509CertificateHolder(aCert).getSubject();
        final RDN cn = x500name.getRDNs(BCStyle.CN)[0];
        return IETFUtils.valueToString(cn.getFirst().getValue());
    }
}