/*-
 * ============LICENSE_START=======================================================
 * Copyright (C) 2019 Ericsson. All rights reserved.
 * ================================================================================
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * ============LICENSE_END=========================================================
 */

package org.onap.appc.listener.util;

import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
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 java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.onap.appc.exceptions.APPCException;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;

@SuppressWarnings("deprecation")
public class HttpClientUtil {
  
  private static final EELFLogger log = EELFManager.getInstance().getLogger(HttpClientUtil.class);

  public static HttpClient getHttpClient(String protocol) throws APPCException {
    HttpClient client;
    if ("https".equals(protocol)) {
      try {
        KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
        trustStore.load(null, null);
        MySSLSocketFactory sf = new MySSLSocketFactory(trustStore);
        sf.setHostnameVerifier(MySSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, HTTP.UTF_8);

        SchemeRegistry registry = new SchemeRegistry();
        registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
        registry.register(new Scheme("https", sf, 443));
        registry.register(new Scheme("https", sf, 8443));
        registry.register(new Scheme("http", sf, 8181));

        ClientConnectionManager ccm = new ThreadSafeClientConnManager(params, registry);
        client = new DefaultHttpClient(ccm, params);
      } catch (Exception e) {
        log.info("Creating Default Http Client with no params " + e.getMessage(), e);
        client = new DefaultHttpClient();
      }
    } else if ("http".equals(protocol)) {
      client = new DefaultHttpClient();
    } else {
      throw new APPCException(
          "The provider.topology.url property is invalid. The url did not start with http[s]");
    }
    return client;
  }

  private static class MySSLSocketFactory extends SSLSocketFactory {
    private SSLContext sslContext = SSLContext.getInstance("TLS");

    public MySSLSocketFactory(KeyStore truststore) throws NoSuchAlgorithmException,
        KeyManagementException, KeyStoreException, UnrecoverableKeyException {
      super(truststore);

      TrustManager tm = new X509TrustManager() {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType)
            throws CertificateException {}

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType)
            throws CertificateException {}

        @Override
        public X509Certificate[] getAcceptedIssuers() {
          return null;
        }
      };

      sslContext.init(null, new TrustManager[] {tm}, null);
    }

    @Override
    public Socket createSocket(Socket socket, String host, int port, boolean autoClose)
        throws IOException, UnknownHostException {
      return sslContext.getSocketFactory().createSocket(socket, host, port, autoClose);
    }

    @Override
    public Socket createSocket() throws IOException {
      return sslContext.getSocketFactory().createSocket();
    }
  }
}