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package com.btr.proxy.search.java;
import java.net.Proxy;
import java.net.ProxySelector;
import com.btr.proxy.search.ProxySearchStrategy;
import com.btr.proxy.selector.fixed.FixedProxySelector;
import com.btr.proxy.selector.misc.ProtocolDispatchSelector;
import com.btr.proxy.selector.whitelist.ProxyBypassListSelector;
import com.btr.proxy.util.Logger;
import com.btr.proxy.util.Logger.LogLevel;
/*****************************************************************************
* Reads some java system properties and extracts the proxy settings from them.
* The following variables are read:
* <ul>
* <li><i>http.proxyHost</i> (default: none)</li>
* <li><i>http.proxyPort</i> (default: 80 if http.proxyHost specified)</li>
* <li><i>http.nonProxyHosts</i> (default: none)</li>
* </ul>
* <ul>
* <li><i>https.proxyHost</i> (default: none)</li>
* <li><i>https.proxyPort</i> (default: 443 if https.proxyHost specified)</li>
* </ul>
* <ul>
* <li><i>ftp.proxyHost</i> (default: none)</li>
* <li><i>ftp.proxyPort</i> (default: 80 if ftp.proxyHost specified)</li>
* <li><i>ftp.nonProxyHosts</i> (default: none)</li>
* </ul>
* <ul>
* <li><i>socksProxyHost</i></li>
* <li><i>socksProxyPort</i> (default: 1080)</li>
* </ul>
* <p>
* This is based on information found here: <br/>
* http://download.oracle.com/javase/6/docs/technotes/guides/net/proxies.html
* </p>
* If the "http.proxyHost" property is not set then the no proxy selector is setup
* This property is used as marker to signal that the System settings should be used.
*
* @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
****************************************************************************/
public class JavaProxySearchStrategy implements ProxySearchStrategy {
/*************************************************************************
* Constructor
* Will use the default environment variables.
************************************************************************/
public JavaProxySearchStrategy() {
super();
}
/*************************************************************************
* Loads the proxy settings from environment variables.
* @return a configured ProxySelector, null if none is found.
************************************************************************/
public ProxySelector getProxySelector() {
ProtocolDispatchSelector ps = new ProtocolDispatchSelector();
if (!proxyPropertyPresent()) {
return null;
}
Logger.log(getClass(), LogLevel.TRACE, "Using settings from Java System Properties");
setupProxyForProtocol(ps, "http", 80);
setupProxyForProtocol(ps, "https", 443);
setupProxyForProtocol(ps, "ftp", 80);
setupProxyForProtocol(ps, "ftps", 80);
setupSocktProxy(ps);
return ps;
}
/*************************************************************************
* @return true if the http.proxyHost is available as system property.
************************************************************************/
private boolean proxyPropertyPresent() {
return System.getProperty("http.proxyHost") != null
&& System.getProperty("http.proxyHost").trim().length() > 0;
}
/*************************************************************************
* Parse SOCKS settings
* @param ps
* @throws NumberFormatException
************************************************************************/
private void setupSocktProxy(ProtocolDispatchSelector ps) {
String host = System.getProperty("socksProxyHost");
String port = System.getProperty("socksProxyPort", "1080");
if (host != null && host.trim().length() > 0) {
Logger.log(getClass(), LogLevel.TRACE, "Socks proxy {0}:{1} found", host, port);
ps.setSelector("socks", new FixedProxySelector(Proxy.Type.SOCKS, host, Integer.parseInt(port)));
}
}
/*************************************************************************
* Parse properties for the given protocol.
* @param ps
* @param protocol
* @throws NumberFormatException
************************************************************************/
private void setupProxyForProtocol(ProtocolDispatchSelector ps, String protocol, int defaultPort) {
String host = System.getProperty(protocol+".proxyHost");
String port = System.getProperty(protocol+".proxyPort", ""+defaultPort);
String whiteList = System.getProperty(protocol+".nonProxyHosts", "").replace('|', ',');
if ("https".equalsIgnoreCase(protocol)) { // This is dirty but https has no own property for it.
whiteList = System.getProperty("http.nonProxyHosts", "").replace('|', ',');
}
if (host == null || host.trim().length() == 0) {
return;
}
Logger.log(getClass(), LogLevel.TRACE, protocol.toUpperCase()+" proxy {0}:{1} found using whitelist: {2}", host, port, whiteList);
ProxySelector protocolSelector = new FixedProxySelector(Proxy.Type.HTTP, host, Integer.parseInt(port));
if (whiteList.trim().length() > 0) {
protocolSelector = new ProxyBypassListSelector(whiteList, protocolSelector);
}
ps.setSelector(protocol, protocolSelector);
}
}
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