DefaultProxyDataFactory.java

/*
 * 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;
        }
    }
}