/
HostPort.java
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/
HostPort.java
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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.util;
/**
* <p>Parse an authority string (in the form {@code host:port}) into
* {@code host} and {@code port}, handling IPv4 and IPv6 host formats
* as defined in https://www.ietf.org/rfc/rfc2732.txt</p>
*/
public class HostPort
{
private final String _host;
private final int _port;
public HostPort(String host, int port)
{
_host = normalizeHost(host);
_port = port;
}
public HostPort(String authority) throws IllegalArgumentException
{
if (authority == null)
throw new IllegalArgumentException("No Authority");
try
{
if (authority.isEmpty())
{
_host = authority;
_port = 0;
}
else if (authority.charAt(0) == '[')
{
// ipv6reference
int close = authority.lastIndexOf(']');
if (close < 0)
throw new IllegalArgumentException("Bad IPv6 host");
_host = authority.substring(0, close + 1);
if (authority.length() > close + 1)
{
if (authority.charAt(close + 1) != ':')
throw new IllegalArgumentException("Bad IPv6 port");
_port = parsePort(authority.substring(close + 2));
}
else
{
_port = 0;
}
}
else
{
// ipv6address or ipv4address or hostname
int c = authority.lastIndexOf(':');
if (c >= 0)
{
// ipv6address
if (c != authority.indexOf(':'))
{
_host = "[" + authority + "]";
_port = 0;
}
else
{
_host = authority.substring(0, c);
_port = parsePort(authority.substring(c + 1));
}
}
else
{
_host = authority;
_port = 0;
}
}
}
catch (IllegalArgumentException iae)
{
throw iae;
}
catch (Exception ex)
{
throw new IllegalArgumentException("Bad HostPort", ex);
}
}
/**
* Get the host.
*
* @return the host
*/
public String getHost()
{
return _host;
}
/**
* Get the port.
*
* @return the port
*/
public int getPort()
{
return _port;
}
/**
* Get the port or the given default port.
*
* @param defaultPort, the default port to return if a port is not specified
* @return the port
*/
public int getPort(int defaultPort)
{
return _port > 0 ? _port : defaultPort;
}
@Override
public String toString()
{
if (_port > 0)
return _host + ":" + _port;
return _host;
}
/**
* Normalizes IPv6 address as per https://tools.ietf.org/html/rfc2732
* and https://tools.ietf.org/html/rfc6874,
* surrounding with square brackets if they are absent.
*
* @param host a host name, IPv4 address, IPv6 address or IPv6 literal
* @return a host name or an IPv4 address or an IPv6 literal (not an IPv6 address)
*/
public static String normalizeHost(String host)
{
// if it is normalized IPv6 or could not be IPv6, return
if (host == null || host.isEmpty() || host.charAt(0) == '[' || host.indexOf(':') < 0)
return host;
// normalize with [ ]
return "[" + host + "]";
}
/**
* Parse a string representing a port validating it is a valid port value.
*
* @param rawPort the port string.
* @return the integer value for the port.
* @throws IllegalArgumentException if the port is invalid
*/
public static int parsePort(String rawPort) throws IllegalArgumentException
{
if (StringUtil.isEmpty(rawPort))
throw new IllegalArgumentException("Bad port");
int port = Integer.parseInt(rawPort);
if (port <= 0 || port > 65535)
throw new IllegalArgumentException("Bad port");
return port;
}
}