/*
    * Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  package org.eclipse.jgit.transport.sshd;
  
  import java.net.InetSocketAddress;
  import java.net.Proxy;
  import java.net.ProxySelector;
  import java.net.SocketAddress;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.List;
  
  /**
   * A default implementation of a {@link ProxyDataFactory} based on the standard
   * {@link java.net.ProxySelector}.
   *
   * @since 5.2
   */
  public class DefaultProxyDataFactory implements ProxyDataFactory {
  
  	@Override
  	public ProxyData get(InetSocketAddress remoteAddress) {
  		try {
  			List<Proxy> proxies = ProxySelector.getDefault()
  					.select(new URI(
  							"socket://" + remoteAddress.getHostString())); //$NON-NLS-1$
  			ProxyData data = getData(proxies, Proxy.Type.SOCKS);
  			if (data == null) {
  				proxies = ProxySelector.getDefault()
  						.select(new URI(Proxy.Type.HTTP.name(),
  								"//" + remoteAddress.getHostString(), //$NON-NLS-1$
  								null));
  				data = getData(proxies, Proxy.Type.HTTP);
  			}
  			return data;
  		} catch (URISyntaxException e) {
  			return null;
  		}
  	}
  
  	private ProxyData getData(List<Proxy> proxies, Proxy.Type type) {
  		Proxy proxy = proxies.stream().filter(p -> type == p.type()).findFirst()
  				.orElse(null);
  		if (proxy == null) {
  			return null;
  		}
  		SocketAddress address = proxy.address();
  		if (!(address instanceof InetSocketAddress)) {
  			return null;
  		}
  		switch (type) {
  		case HTTP:
  			return new ProxyData(proxy);
  		case SOCKS:
  			return new ProxyData(proxy);
  		default:
  			return null;
  		}
  	}
  }