/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.core5.http2.ssl;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLParameters;

import org.apache.hc.core5.http.ssl.TLS;
import org.apache.hc.core5.http.ssl.TlsCiphers;
import org.apache.hc.core5.net.NamedEndpoint;
import org.apache.hc.core5.reactor.ssl.SSLSessionInitializer;
import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
import org.apache.hc.core5.reactor.ssl.TlsDetails;
import org.conscrypt.Conscrypt;

/**
 * Conscrypt TLS support methods
 *
 * @since 5.0
 */
public final class ConscryptSupport {

    public static SSLSessionInitializer initialize(
            final Object attachment,
            final SSLSessionInitializer initializer) {
        return new SSLSessionInitializer() {

            @Override
            public void initialize(final NamedEndpoint endpoint, final SSLEngine sslEngine) {
                final SSLParameters sslParameters = sslEngine.getSSLParameters();
                sslParameters.setProtocols(TLS.excludeWeak(sslParameters.getProtocols()));
                sslParameters.setCipherSuites(TlsCiphers.excludeH2Blacklisted(sslParameters.getCipherSuites()));
                H2TlsSupport.setEnableRetransmissions(sslParameters, false);
                final String[] appProtocols = H2TlsSupport.selectApplicationProtocols(attachment);
                if (Conscrypt.isConscrypt(sslEngine)) {
                    sslEngine.setSSLParameters(sslParameters);
                    Conscrypt.setApplicationProtocols(sslEngine, appProtocols);
                } else {
                    H2TlsSupport.setApplicationProtocols(sslParameters, appProtocols);
                    sslEngine.setSSLParameters(sslParameters);
                }
                if (initializer != null) {
                    initializer.initialize(endpoint, sslEngine);
                }
            }

        };
    }

    public static SSLSessionVerifier verify(final SSLSessionVerifier verifier) {
        return new SSLSessionVerifier() {

            @Override
            public TlsDetails verify(final NamedEndpoint endpoint, final SSLEngine sslEngine) throws SSLException {
                TlsDetails tlsDetails = verifier != null ? verifier.verify(endpoint, sslEngine) : null;
                if (tlsDetails == null && Conscrypt.isConscrypt(sslEngine)) {
                    tlsDetails = new TlsDetails(sslEngine.getSession(), Conscrypt.getApplicationProtocol(sslEngine));
                }
                return tlsDetails;
            }

        };
    }

}
