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package com.btr.proxy.util;
import java.net.Proxy;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.btr.proxy.selector.fixed.FixedProxySelector;
import com.btr.proxy.selector.pac.PacProxySelector;
import com.btr.proxy.selector.pac.PacScriptSource;
import com.btr.proxy.selector.pac.UrlPacScriptSource;
import com.btr.proxy.util.Logger.LogLevel;
/*****************************************************************************
* Small helper class for some common utility methods.
*
* @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
****************************************************************************/
public class ProxyUtil {
public static final int DEFAULT_PROXY_PORT = 80;
private static List<Proxy> noProxyList;
private static Pattern pattern = Pattern.compile("\\w*?:?/*([^:/]+):?(\\d*)/?");
/*************************************************************************
* Parse host and port out of a proxy variable.
*
* @param proxyVar the proxy string. example: http://192.168.10.9:8080/
* @return a FixedProxySelector using this settings, null on parse error.
************************************************************************/
public static FixedProxySelector parseProxySettings(String proxyVar) {
if (proxyVar == null || proxyVar.trim().length() == 0) {
return null;
}
Matcher matcher = pattern.matcher(proxyVar);
if (matcher.matches()) {
String host = matcher.group(1);
int port;
if (!"".equals(matcher.group(2))) {
port = Integer.parseInt(matcher.group(2));
} else {
port = DEFAULT_PROXY_PORT;
}
return new FixedProxySelector(host.trim(), port);
} else {
return null;
}
}
/*************************************************************************
* Gets an unmodifiable proxy list that will have as it's only entry an
* DIRECT proxy.
*
* @return a list with a DIRECT proxy in it.
************************************************************************/
public static synchronized List<Proxy> noProxyList() {
if (noProxyList == null) {
ArrayList<Proxy> list = new ArrayList<Proxy>(1);
list.add(Proxy.NO_PROXY);
noProxyList = Collections.unmodifiableList(list);
}
return noProxyList;
}
/*************************************************************************
* Build a PAC proxy selector for the given URL.
*
* @param url to fetch the PAC script from.
* @return a PacProxySelector or null if it is not possible to build a
* working
* selector.
************************************************************************/
public static PacProxySelector buildPacSelectorForUrl(final String url) {
Logger.log(ProxyUtil.class, LogLevel.TRACE, "Fetching PAC script from {0}", url);
final AtomicReference<PacProxySelector> result = new AtomicReference<>();
Thread t = new Thread() {
@Override
public void run() {
PacScriptSource pacSource = new UrlPacScriptSource(url);
if (pacSource.isScriptValid()) {
result.set(new PacProxySelector(pacSource));
}
}
};
t.start();
try {
t.join(2500);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
return result.get();
}
}
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