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/*
 * ====================================================================
 * 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
 * .
 *
 */

package org.apache.http.ssl;

import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;

import javax.net.ssl.SSLContext;

/**
 * {@link javax.net.ssl.SSLContext} factory methods.
 *
 * @since 4.4
 */
public class SSLContexts {

    /**
     * Creates default factory based on the standard JSSE trust material
     * ({@code cacerts} file in the security properties directory). System properties
     * are not taken into consideration.
     *
     * @return the default SSL socket factory
     */
    public static SSLContext createDefault() throws SSLInitializationException {
        try {
            final SSLContext sslContext = SSLContext.getInstance(SSLContextBuilder.TLS);
            sslContext.init(null, null, null);
            return sslContext;
        } catch (final NoSuchAlgorithmException ex) {
            throw new SSLInitializationException(ex.getMessage(), ex);
        } catch (final KeyManagementException ex) {
            throw new SSLInitializationException(ex.getMessage(), ex);
        }
    }

    /**
     * Creates default SSL context based on system properties. This method obtains
     * default SSL context by calling {@code SSLContext.getInstance("Default")}.
     * Please note that {@code Default} algorithm is supported as of Java 6.
     * This method will fall back onto {@link #createDefault()} when
     * {@code Default} algorithm is not available.
     *
     * @return default system SSL context
     */
    public static SSLContext createSystemDefault() throws SSLInitializationException {
        try {
            return SSLContext.getDefault();
        } catch (final NoSuchAlgorithmException ex) {
            return createDefault();
        }
    }

    /**
     * Creates custom SSL context.
     *
     * @return default system SSL context
     */
    public static SSLContextBuilder custom() {
        return SSLContextBuilder.create();
    }

}