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/*
 * Licensed to 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. Apache Software Foundation (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.
 */

package org.apache.eventmesh.runtime.boot;

import org.apache.eventmesh.runtime.configuration.EventMeshHTTPConfiguration;
import org.apache.eventmesh.runtime.constants.EventMeshConstants;

import org.apache.commons.lang3.StringUtils;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SSLContextFactory {
    private static String protocol = "TLSv1.1";

    private static String fileName;

    private static String password;

    public static SSLContext getSslContext(final EventMeshHTTPConfiguration eventMeshHttpConfiguration)
            throws NoSuchAlgorithmException, KeyStoreException, CertificateException, IOException,
            UnrecoverableKeyException, KeyManagementException {
        SSLContext sslContext;

        try (InputStream inputStream = Files.newInputStream(Paths.get(EventMeshConstants.EVENTMESH_CONF_HOME
                + File.separator
                + fileName), StandardOpenOption.READ)) {
            protocol = eventMeshHttpConfiguration.eventMeshServerSSLProtocol;
            fileName = eventMeshHttpConfiguration.eventMeshServerSSLCer;
            password = eventMeshHttpConfiguration.eventMeshServerSSLPass;

            char[] filePass = StringUtils.isNotBlank(password) ? password.toCharArray() : new char[0];
            final KeyStore keyStore = KeyStore.getInstance("JKS");
            keyStore.load(inputStream, filePass);
            final KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(keyStore, filePass);

            sslContext = SSLContext.getInstance(protocol);
            sslContext.init(kmf.getKeyManagers(), null, null);
        }

        return sslContext;
    }
}