code: /**
   * This file is part of Eclipse Steady.
   *
   * 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
   * SPDX-FileCopyrightText: Copyright (c) 2018-2020 SAP SE or an SAP affiliate company and Eclipse Steady contributors
   */
  package org.eclipse.steady.patcha;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.Proxy;
  import java.net.ProxySelector;
  import java.net.SocketAddress;
  import java.net.URI;
  import java.util.Arrays;
  import java.util.List;
  
  import org.apache.commons.configuration.Configuration;
  import org.apache.logging.log4j.Logger;
  import org.eclipse.steady.shared.util.StringList;
  import org.eclipse.steady.shared.util.VulasConfiguration;
  import org.eclipse.steady.shared.util.StringList.CaseSensitivity;
  import org.eclipse.steady.shared.util.StringList.ComparisonMode;
  
  /**
   * <p>VulasProxySelector class.</p>
   */
  public class VulasProxySelector extends ProxySelector {
  
    private static final Logger log = org.apache.logging.log4j.LogManager.getLogger();
  
    private static ProxySelector instance = new VulasProxySelector();
  
    /**
     * <p>registerAsDefault.</p>
     */
    public static void registerAsDefault() {
      ProxySelector.setDefault(VulasProxySelector.instance);
    }
  
    private Proxy httpProxy = null;
  
    private Configuration cfg = null;
  
    // private Set<String> noProxyHosts = new HashSet<String>();
  
    private StringList noProxyHosts = new StringList();
  
    ProxySelector def = null;
  
    /**
     * <p>Constructor for VulasProxySelector.</p>
     */
    public VulasProxySelector() {
  
      // Remember current default (fallback solution)
      this.def = ProxySelector.getDefault();
  
      // Read configuration
      this.cfg = VulasConfiguration.getGlobal().getConfiguration();
  
      // No proxy for the following hosts
      noProxyHosts.addAll(this.cfg.getString("http.nonProxyHosts", ""), "\\|", true);
      // String[] no_proxy_hosts = this.cfg.getString("http.nonProxyHosts", "").split("\\|");
      // for(int i=0; i<no_proxy_hosts.length; i++) this.noProxyHosts.add(no_proxy_hosts[i]);
  
      // Create HTTP proxy
      if (this.cfg.getString("http.proxyHost") != null
          && !this.cfg.getString("http.proxyHost").equals("")
          && this.cfg.getString("http.proxyPort") != null
          && !this.cfg.getString("http.proxyPort").equals("")) {
        this.httpProxy =
            new Proxy(
                Proxy.Type.HTTP,
                new InetSocketAddress(
                    this.cfg.getString("http.proxyHost"), this.cfg.getInt("http.proxyPort")));
        VulasProxySelector.log.info(
            "Proxy selector configuration: ["
                + this.cfg.getString("http.proxyHost")
                + ":"
                + this.cfg.getInt("http.proxyPort")
                + ", non proxy hosts: "
                + this.noProxyHosts.toString()
                + "]");
      } else {
        VulasProxySelector.log.info("Proxy selector configuration: None");
      }
    }
  
    /** {@inheritDoc} */
    @Override
    public List<Proxy> select(URI uri) {
      List<Proxy> l = null;
      if (this.noProxyHosts.contains(
          uri.getHost(), ComparisonMode.PATTERN, CaseSensitivity.CASE_INSENSITIVE)) {
        VulasProxySelector.log.info("No proxy for URL [" + uri + "]");
        l = Arrays.asList(Proxy.NO_PROXY);
      } else {
        if (this.httpProxy != null
            && (uri.getScheme().equalsIgnoreCase("http")
                || uri.getScheme().equalsIgnoreCase("https"))) {
          VulasProxySelector.log.info("Using proxy [" + this.httpProxy + "] for URL [" + uri + "]");
          l = Arrays.asList(this.httpProxy);
        } else {
          l = this.def.select(uri);
        }
      }
      return l;
    }
  
    /** {@inheritDoc} */
    @Override
    public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {
      if (uri == null || sa == null || ioe == null) {
        throw new IllegalArgumentException("Arguments can not be null.");
      }
    }
  }
  