/**
* Creates a proxy server instance from the given properties.
*
* <p>Currently the default http.* proxy properties are supported as well as properties specific
* for AHC.
*
* @param properties the properties to evaluate. Must not be null.
* @return a ProxyServer instance or null, if no valid properties were set.
* @see <a
* href="http://download.oracle.com/javase/1.4.2/docs/guide/net/properties.html">Networking
* Properties</a>
* @see #PROXY_HOST
* @see #PROXY_PORT
* @see #PROXY_PROTOCOL
* @see #PROXY_NONPROXYHOSTS
*/
public static ProxyServer createProxy(Properties properties) {
String host = System.getProperty(PROXY_HOST);
if (host != null) {
int port = Integer.valueOf(System.getProperty(PROXY_PORT, "80"));
Protocol protocol;
try {
protocol = Protocol.valueOf(System.getProperty(PROXY_PROTOCOL, "HTTP"));
} catch (IllegalArgumentException e) {
protocol = Protocol.HTTP;
}
ProxyServer proxyServer =
new ProxyServer(
protocol,
host,
port,
System.getProperty(PROXY_USER),
System.getProperty(PROXY_PASSWORD));
String nonProxyHosts = System.getProperties().getProperty(PROXY_NONPROXYHOSTS);
if (nonProxyHosts != null) {
for (String spec : nonProxyHosts.split("\\|")) {
proxyServer.addNonProxyHost(spec);
}
}
return proxyServer;
}
return null;
}
/**
* Checks whether proxy should be used according to nonProxyHosts settings of it, or we want to go
* directly to target host. If <code>null</code> proxy is passed in, this method returns true --
* since there is NO proxy, we should avoid to use it. Simple hostname pattern matching using "*"
* are supported, but only as prefixes. See
* http://download.oracle.com/javase/1.4.2/docs/guide/net/properties.html
*
* @param proxyServer
* @param target the hostname
* @return true if we have to avoid proxy use (obeying non-proxy hosts settings), false otherwise.
*/
public static boolean avoidProxy(final ProxyServer proxyServer, final String target) {
if (proxyServer != null) {
final String targetHost = target.toLowerCase();
List<String> nonProxyHosts = proxyServer.getNonProxyHosts();
if (nonProxyHosts != null && nonProxyHosts.size() > 0) {
for (String nonProxyHost : nonProxyHosts) {
if (nonProxyHost.startsWith("*")
&& nonProxyHost.length() > 1
&& targetHost.endsWith(nonProxyHost.substring(1).toLowerCase())) {
return true;
} else if (nonProxyHost.equalsIgnoreCase(targetHost)) {
return true;
}
}
}
return false;
} else {
return true;
}
}