 public List<Proxy> select(URI uri) {
if (uri == null) {
throw new IllegalArgumentException("URI can't be null.");
}
String protocol = uri.getScheme();
String host = uri.getHost();
int port = uri.getPort();
if (host == null) {
// This is a hack to ensure backward compatibility in two
// cases: 1. hostnames contain non-ascii characters,
// internationalized domain names. in which case, URI will
// return null, see BugID 4957669; 2. Some hostnames can
// contain '_' chars even though it's not supposed to be
// legal, in which case URI will return null for getHost,
// but not for getAuthority() See BugID 4913253
String auth = uri.getAuthority();
if (auth != null) {
int i;
i = auth.indexOf('@');
if (i >= 0) {
auth = auth.substring(i+1);
}
i = auth.lastIndexOf(':');
if (i >= 0) {
try {
port = Integer.parseInt(auth.substring(i+1));
} catch (NumberFormatException e) {
port = -1;
}
auth = auth.substring(0,i);
}
host = auth;
}
}
if (protocol == null || host == null) {
throw new IllegalArgumentException("protocol = "+protocol+" host = "+host);
}
List< Proxy > proxyl = new ArrayList< Proxy >(1);
// special case localhost and loopback addresses to
// not go through proxy
if (isLoopback(host)) {
proxyl.add(Proxy.NO_PROXY);
return proxyl;
}
NonProxyInfo pinfo = null;
if ("http".equalsIgnoreCase(protocol)) {
pinfo = httpNonProxyInfo;
} else if ("https".equalsIgnoreCase(protocol)) {
// HTTPS uses the same property as HTTP, for backward
// compatibility
pinfo = httpNonProxyInfo;
} else if ("ftp".equalsIgnoreCase(protocol)) {
pinfo = ftpNonProxyInfo;
}
/**
* Let's check the System properties for that protocol
*/
final String proto = protocol;
final NonProxyInfo nprop = pinfo;
final String urlhost = host.toLowerCase();
/**
* This is one big doPrivileged call, but we're trying to optimize
* the code as much as possible. Since we're checking quite a few
* System properties it does help having only 1 call to doPrivileged.
* Be mindful what you do in here though!
*/
Proxy p = (Proxy) AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
int i, j;
String phost = null;
int pport = 0;
String nphosts = null;
InetSocketAddress saddr = null;
// Then let's walk the list of protocols in our array
for (i=0; i< props.length; i++) {
if (props[i][0].equalsIgnoreCase(proto)) {
for (j = 1; j < props[i].length; j++) {
/* System.getProp() will give us an empty
* String, "" for a defined but "empty"
* property.
*/
phost = NetProperties.get(props[i][j]+"Host");
if (phost != null && phost.length() != 0)
break;
}
if (phost == null || phost.length() == 0) {
/**
* No system property defined for that
* protocol. Let's check System Proxy
* settings (Gnome & Windows) if we were
* instructed to.
*/
if (hasSystemProxies) {
String sproto;
if (proto.equalsIgnoreCase("socket"))
sproto = "socks";
else
sproto = proto;
Proxy sproxy = getSystemProxy(sproto, urlhost);
if (sproxy != null) {
return sproxy;
}
}
return Proxy.NO_PROXY;
}
// If a Proxy Host is defined for that protocol
// Let's get the NonProxyHosts property
if (nprop != null) {
nphosts = NetProperties.get(nprop.property);
synchronized (nprop) {
if (nphosts == null) {
nprop.hostsSource = null;
nprop.hostsPool = null;
} else {
if (!nphosts.equals(nprop.hostsSource)) {
RegexpPool pool = new RegexpPool();
StringTokenizer st = new StringTokenizer(nphosts, "|", false);
try {
while (st.hasMoreTokens()) {
pool.add(st.nextToken().toLowerCase(), Boolean.TRUE);
}
} catch (sun.misc.REException ex) {
}
nprop.hostsPool = pool;
nprop.hostsSource = nphosts;
}
}
if (nprop.hostsPool != null &&
nprop.hostsPool.match(urlhost) != null) {
return Proxy.NO_PROXY;
}
}
}
// We got a host, let's check for port
pport = NetProperties.getInteger(props[i][j]+"Port", 0).intValue();
if (pport == 0 && j < (props[i].length - 1)) {
// Can't find a port with same prefix as Host
// AND it's not a SOCKS proxy
// Let's try the other prefixes for that proto
for (int k = 1; k < (props[i].length - 1); k++) {
if ((k != j) && (pport == 0))
pport = NetProperties.getInteger(props[i][k]+"Port", 0).intValue();
}
}
// Still couldn't find a port, let's use default
if (pport == 0) {
if (j == (props[i].length - 1)) // SOCKS
pport = defaultPort("socket");
else
pport = defaultPort(proto);
}
// We did find a proxy definition.
// Let's create the address, but don't resolve it
// as this will be done at connection time
saddr = InetSocketAddress.createUnresolved(phost, pport);
// Socks is *always* the last on the list.
if (j == (props[i].length - 1)) {
return new Proxy(Proxy.Type.SOCKS, saddr);
} else {
return new Proxy(Proxy.Type.HTTP, saddr);
}
}
}
return Proxy.NO_PROXY;
}});
proxyl.add(p);
/*
* If no specific property was set for that URI, we should be
* returning an iterator to an empty List.
*/
return proxyl;
}
select() method. Where all the hard work is done.
Build a list of proxies depending on URI.
Since we're only providing compatibility with the system properties
from previous releases (see list above), that list will always
contain 1 single proxy, default being NO_PROXY. | java.net.ProxySelector
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