org.bouncycastle.cert.dane.DANECertificateFetcher Maven / Gradle / Ivy

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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cert.dane;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.bouncycastle.operator.DigestCalculator;

/**
 * A single shot fetcher for a certificate which will only request the specific DNS record if the
 * DANEEntryFetcher used on construction supports it.
 */
public class DANECertificateFetcher
{
    private final DANEEntryFetcherFactory fetcherFactory;
    private final DANEEntrySelectorFactory selectorFactory;

    /**
     * Base constructor.
     *
     * @param fetcherFactory the fetcher to use for resolving requests.
     * @param digestCalculator the digest calculator to use for calculating sub-domains.
     */
    public DANECertificateFetcher(DANEEntryFetcherFactory fetcherFactory, DigestCalculator digestCalculator)
    {
        this.fetcherFactory = fetcherFactory;
        this.selectorFactory= new DANEEntrySelectorFactory(digestCalculator);
    }

    /**
     * Fetch the certificates associated with the passed in email address if any exists.
     *
     * @param emailAddress the email address of interest.
     * @return a list of X509CertificateHolder objects, or an empty list if none present.
     * @throws DANEException in case of an underlying DNS or record parsing problem.
     */
    public List fetch(String emailAddress)
        throws DANEException
    {
        DANEEntrySelector daneSelector = selectorFactory.createSelector(emailAddress);

        List matches = fetcherFactory.build(daneSelector.getDomainName()).getEntries();
        List certs = new ArrayList(matches.size());

        for (Iterator it = matches.iterator(); it.hasNext();)
        {
            DANEEntry next = (DANEEntry)it.next();
            if (daneSelector.match(next))
            {
                certs.add(next.getCertificate());
            }
        }

        return Collections.unmodifiableList(certs);
    }
}