001/*
002 * Copyright 2015-2020 the original author or authors
003 *
004 * This software is licensed under the Apache License, Version 2.0,
005 * the GNU Lesser General Public License version 2 or later ("LGPL")
006 * and the WTFPL.
007 * You may choose either license to govern your use of this software only
008 * upon the condition that you accept all of the terms of either
009 * the Apache License 2.0, the LGPL 2.1+ or the WTFPL.
010 */
011package org.minidns.dane;
012
013import java.security.KeyStore;
014import java.security.KeyStoreException;
015import java.security.NoSuchAlgorithmException;
016
017import javax.net.ssl.TrustManager;
018import javax.net.ssl.TrustManagerFactory;
019import javax.net.ssl.X509TrustManager;
020
021public class X509TrustManagerUtil {
022
023    public static X509TrustManager getDefault() {
024        return getDefault(null);
025    }
026
027    public static X509TrustManager getDefault(KeyStore keyStore) {
028        String defaultAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
029        TrustManagerFactory trustManagerFactory;
030        try {
031            trustManagerFactory = TrustManagerFactory.getInstance(defaultAlgorithm);
032            trustManagerFactory.init(keyStore);
033        } catch (NoSuchAlgorithmException | KeyStoreException e) {
034            throw new AssertionError(e);
035        }
036
037        for (TrustManager trustManager : trustManagerFactory.getTrustManagers()) {
038            if (trustManager instanceof X509TrustManager) {
039                return (X509TrustManager) trustManager;
040            }
041        }
042        throw new AssertionError("No trust manager for the default algorithm " + defaultAlgorithm + " found");
043    }
044}