/*
 * Copyright 2020 The Apache Software Foundation.
 *
 * Licensed 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.activemq.artemis.spi.core.remoting.ssl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import javax.net.ssl.SSLContext;

/**
 * Provider that loads the SSLContextFactory services and return the one with the highest priority.
 * This is only used to provide SSLContext, so it doesn't support OpenSSL.
 */
public class SSLContextFactoryProvider {
   private static final SSLContextFactory factory;
   static {
      ServiceLoader<SSLContextFactory> loader = ServiceLoader.load(SSLContextFactory.class, SSLContextFactoryProvider.class.getClassLoader());
      final List<SSLContextFactory> factories = new ArrayList<>();
      loader.forEach(factories::add);
      if (factories.isEmpty()) {
         factory = new SSLContextFactory() {
            @Override
            public SSLContext getSSLContext(Map<String, Object> configuration,
                  String keystoreProvider, String keystoreType, String keystorePath, String keystorePassword,
                  String truststoreProvider, String truststoreType, String truststorePath, String truststorePassword,
                  String crlPath, String trustManagerFactoryPlugin, boolean trustAll) throws Exception {
               return SSLContext.getDefault();
            }

            @Override
            public int getPriority() {
               return -1;
            }
         };
      } else {
         Collections.sort(factories);
         factory = factories.get(factories.size() - 1);
      }
   }
   /**
    * @return the SSLContextFactory with the higher priority.
    */
   public static SSLContextFactory getSSLContextFactory() {
      return factory;
   }
}
