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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.shared.security.tls;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.SSLContext;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Set;
import java.util.stream.Collectors;

public abstract class DefaultTLSProtocolProvider {
    // Defaults to TLS protocols that are currently considered secure
    private static final Set SECURE_TLS_PROTOCOLS = ImmutableSet.of("TLSv1.2", "TLSv1.3");

    private static final Logger LOG = LoggerFactory.getLogger(DefaultTLSProtocolProvider.class);
    private static Set defaultSupportedTlsProtocols = null;

    public synchronized static Set getSecureTLSProtocols() {
        if (defaultSupportedTlsProtocols != null) {
            return defaultSupportedTlsProtocols;
        }

        final Set tlsProtocols = Sets.newHashSet(SECURE_TLS_PROTOCOLS);
        final Set supportedProtocols = getAllSupportedTlsProtocols();
        if (tlsProtocols.retainAll(supportedProtocols)) {
            LOG.warn("JRE doesn't support all default TLS protocols. Changing <{}> to <{}>", SECURE_TLS_PROTOCOLS, tlsProtocols);
        }
        defaultSupportedTlsProtocols = tlsProtocols;
        return defaultSupportedTlsProtocols;
    }

    public static Set getAllSupportedTlsProtocols() {
        try {
            // Drop SSLv3, as it's not supported by OpenSSL anymore
            return Arrays.stream(SSLContext.getDefault().createSSLEngine().getSupportedProtocols()).filter(p -> !p.equals("SSLv3")).collect(Collectors.toSet());
        } catch (NoSuchAlgorithmException e) {
            LOG.error("Failed to detect supported TLS protocols. Keeping default <{}>", SECURE_TLS_PROTOCOLS, e);
            return SECURE_TLS_PROTOCOLS;
        }
    }
}