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Code responsible for parsing the Neo4j configuration.
There is a newer version: 5.26.0
/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see .
 */
package org.neo4j.configuration.helpers;

import java.net.URI;
import java.util.function.BiFunction;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static java.lang.Integer.parseInt;
import static java.lang.String.format;

public class SocketAddressParser
{
    private static final Pattern hostnamePortPatternExt = Pattern.compile( "\\[(?[^\\s]+)]:(?\\d+)" );
    private static final Pattern hostnamePortPattern = Pattern.compile( "(?[^\\s]*([^:\\s]|::)):(?\\d+)" );
    // hostnamePattern matches if there are no colons (most usage) or if there are 2 or more colons (raw IPv6 address)
    // the lookahead needs to include the end of string anchor ($) to ensure it matches the whole string - although the main regex does not need the trailing $
    private static final Pattern hostnamePattern = Pattern.compile( "(?=([^:]+:?|[^:^\\s]*:[^:^\\s]*:[^\\s]*)$)(?[^\\s]+)" );
    private static final Pattern portPattern = Pattern.compile( ":(?\\d+)" );

    public static  T deriveSocketAddress(
            String settingName, String settingValue, String defaultHostname, int defaultPort,
            BiFunction constructor )
    {
        if ( settingValue == null )
        {
            return constructor.apply( defaultHostname, defaultPort );
        }

        settingValue = settingValue.trim();

        T socketAddress;
        if ( (socketAddress = matchHostnamePort( settingValue, constructor )) != null )
        {
            return socketAddress;
        }

        if ( (socketAddress = matchPort( settingValue, defaultHostname, constructor )) != null )
        {
            return socketAddress;
        }

        throw new IllegalArgumentException( format(
                "Setting \"%s\" must be in the format " +
                "\"hostname:port\" or \":port\". \"%s\" does not conform to these formats",
                settingName, settingValue ) );
    }

    public static  T socketAddress( URI uri, int defaultPort,
                                                             BiFunction constructor )
    {
        int port = uri.getPort();
        return constructor.apply( uri.getHost(), port > 0 ? port : defaultPort );
    }

    public static  T socketAddress( String settingValue,
                                                             BiFunction constructor )
    {
        return socketAddress( settingValue, -1, constructor );
    }

    public static  T socketAddress( String settingValue, int defaultPort,
                                                             BiFunction constructor )
    {
        if ( settingValue == null )
        {
            throw new IllegalArgumentException( "Cannot parse socket address from null" );
        }

        if ( settingValue.contains( "://" ) )
        {
            throw new IllegalArgumentException( format(
                    "Configured socket address seems to be an URI. The socket address must be in the format " +
                    "\"hostname:port\", \"hostname\" or \":port\". \"%s\" does not conform to these formats", settingValue ) );
        }

        settingValue = settingValue.trim();

        T socketAddress;
        if ( (socketAddress = matchHostnamePort( settingValue, constructor )) != null )
        {
            return socketAddress;
        }

        if ( (socketAddress = matchPort( settingValue, null, constructor )) != null )
        {
            return socketAddress;
        }

        if ( (socketAddress = matchHostname( settingValue, defaultPort, constructor )) != null )
        {
            return socketAddress;
        }

        throw new IllegalArgumentException( format(
                "Configured socket address must be in the format " +
                "\"hostname:port\", \"hostname\" or \":port\". \"%s\" does not conform to these formats", settingValue ) );
    }

    private static  T matchHostname( String settingValue, int defaultPort, BiFunction constructor )
    {
        Matcher hostnameMatcher = hostnamePattern.matcher( settingValue );
        if ( hostnameMatcher.matches() )
        {
            String hostname = hostnameMatcher.group( "hostname" );
            return constructor.apply( hostname, defaultPort );
        }
        return null;
    }

    private static  T matchHostnamePort( String settingValue,
                                                                  BiFunction constructor )
    {
        Matcher hostnamePortWithBracketsMatcher = hostnamePortPatternExt.matcher( settingValue );
        if ( hostnamePortWithBracketsMatcher.matches() )
        {
            String hostname = hostnamePortWithBracketsMatcher.group( "hostname" );
            int port = parseInt( hostnamePortWithBracketsMatcher.group( "port" ) );
            return constructor.apply( hostname, port );
        }

        Matcher hostnamePortMatcher = hostnamePortPattern.matcher( settingValue );
        if ( hostnamePortMatcher.matches() )
        {
            String hostname = hostnamePortMatcher.group( "hostname" );
            int port = parseInt( hostnamePortMatcher.group( "port" ) );
            return constructor.apply( hostname, port );
        }

        return null;
    }

    private static  T matchPort( String settingValue, String defaultHostname,
                                                          BiFunction constructor )
    {
        Matcher portMatcher = portPattern.matcher( settingValue );
        if ( portMatcher.matches() )
        {
            int port = parseInt( portMatcher.group( "port" ) );
            return constructor.apply( defaultHostname, port );
        }

        return null;
    }
}