DefaultMetaserver.java

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/*
 * This file is part of JXClient, the Fullscreen Java Crossfire Client.
 *
 * JXClient is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * JXClient is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JXClient; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Copyright (C) 2005-2008 Yann Chachkoff
 * Copyright (C) 2006-2017,2019-2023 Andreas Kirschbaum
 * Copyright (C) 2010-2012,2014-2018,2020-2023 Nicolas Weeger
 */
 
package com.realtime.crossfire.jxclient.metaserver;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collection;
import org.jetbrains.annotations.NotNull;
 
public class DefaultMetaserver implements Metaserver {
 
    @NotNull
    private final String metaserverUrl;
 
    public DefaultMetaserver(@NotNull final String metaserverUrl) {
        this.metaserverUrl = metaserverUrl;
    }
 
    @NotNull
    @Override
    public Collection<MetaserverEntry> queryMetaserver() {
        final MetaserverEntry localhostMetaserverEntry = MetaserverEntryParser.parseEntry(ServerCache.DEFAULT_ENTRY_LOCALHOST);
        assert localhostMetaserverEntry != null;
        final Collection<MetaserverEntry> result = new ArrayList<>();
        result.add(localhostMetaserverEntry);
 
        try {
            final String httpProxy = System.getenv("http_proxy");
            if (httpProxy != null && !httpProxy.isEmpty()) {
                if (httpProxy.regionMatches(true, 0, "http://", 0, 7)) {
                    final String[] tmp = httpProxy.substring(7).replaceAll("/.*", "").split(":", 2);
                    System.setProperty("http.proxyHost", tmp[0]);
                    System.setProperty("http.proxyPort", tmp.length >= 2 ? tmp[1] : "80");
                } else {
                    System.err.println("Warning: unsupported http_proxy protocol: "+httpProxy);
                }
            }
            final URL url = new URL(metaserverUrl);
            final HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            try {
                conn.setRequestMethod("GET");
                conn.setUseCaches(false);
                conn.connect();
                if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                    final InputStream in = conn.getInputStream();
                    try (InputStreamReader isr = new InputStreamReader(in, StandardCharsets.ISO_8859_1)) {
                        try (BufferedReader br = new BufferedReader(isr)) {
                            final MetaserverEntryParser metaserverEntryParser = new MetaserverEntryParser();
                            while (true) {
                                final String line = br.readLine();
                                if (line == null) {
                                    break;
                                }
 
                                final MetaserverEntry metaserverEntry = metaserverEntryParser.parseLine(line);
                                if (metaserverEntry != null) {
                                    result.add(metaserverEntry);
                                }
                            }
                        }
                    }
                }
            } finally {
                conn.disconnect();
            }
        } catch (final IOException ignored) {
            // ignore (but keep already parsed entries)
        }
 
        return result;
    }
 
}