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Apache HttpComponents Client
/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
* The following parameters can be used to customize the behavior of this
* class:
*
* - {@link org.apache.http.conn.params.ConnRoutePNames#LOCAL_ADDRESS}
* - {@link org.apache.http.conn.params.ConnRoutePNames#FORCED_ROUTE}
*
*
* @since 4.0
*
* @deprecated (4.3) use {@link SystemDefaultRoutePlanner}
*/
@Deprecated
public class ProxySelectorRoutePlanner implements HttpRoutePlanner {
/** The scheme registry. */
protected final SchemeRegistry schemeRegistry; // @Contract(threading = ThreadingBehavior.SAFE)
/** The proxy selector to use, or {@code null} for system default. */
protected ProxySelector proxySelector;
/**
* Creates a new proxy selector route planner.
*
* @param schreg the scheme registry
* @param prosel the proxy selector, or
* {@code null} for the system default
*/
public ProxySelectorRoutePlanner(final SchemeRegistry schreg,
final ProxySelector prosel) {
Args.notNull(schreg, "SchemeRegistry");
schemeRegistry = schreg;
proxySelector = prosel;
}
/**
* Obtains the proxy selector to use.
*
* @return the proxy selector, or {@code null} for the system default
*/
public ProxySelector getProxySelector() {
return this.proxySelector;
}
/**
* Sets the proxy selector to use.
*
* @param prosel the proxy selector, or
* {@code null} to use the system default
*/
public void setProxySelector(final ProxySelector prosel) {
this.proxySelector = prosel;
}
@Override
public HttpRoute determineRoute(final HttpHost target,
final HttpRequest request,
final HttpContext context)
throws HttpException {
Args.notNull(request, "HTTP request");
// If we have a forced route, we can do without a target.
HttpRoute route =
ConnRouteParams.getForcedRoute(request.getParams());
if (route != null) {
return route;
}
// If we get here, there is no forced route.
// So we need a target to compute a route.
Asserts.notNull(target, "Target host");
final InetAddress local =
ConnRouteParams.getLocalAddress(request.getParams());
final HttpHost proxy = determineProxy(target, request, context);
final Scheme schm =
this.schemeRegistry.getScheme(target.getSchemeName());
// as it is typically used for TLS/SSL, we assume that
// a layered scheme implies a secure connection
final boolean secure = schm.isLayered();
if (proxy == null) {
route = new HttpRoute(target, local, secure);
} else {
route = new HttpRoute(target, local, proxy, secure);
}
return route;
}
/**
* Determines a proxy for the given target.
*
* @param target the planned target, never {@code null}
* @param request the request to be sent, never {@code null}
* @param context the context, or {@code null}
*
* @return the proxy to use, or {@code null} for a direct route
*
* @throws HttpException
* in case of system proxy settings that cannot be handled
*/
protected HttpHost determineProxy(final HttpHost target,
final HttpRequest request,
final HttpContext context)
throws HttpException {
// the proxy selector can be 'unset', so we better deal with null here
ProxySelector psel = this.proxySelector;
if (psel == null) {
psel = ProxySelector.getDefault();
}
if (psel == null) {
return null;
}
URI targetURI = null;
try {
targetURI = new URI(target.toURI());
} catch (final URISyntaxException usx) {
throw new HttpException
("Cannot convert host to URI: " + target, usx);
}
final List proxies = psel.select(targetURI);
final Proxy p = chooseProxy(proxies, target, request, context);
HttpHost result = null;
if (p.type() == Proxy.Type.HTTP) {
// convert the socket address to an HttpHost
if (!(p.address() instanceof InetSocketAddress)) {
throw new HttpException
("Unable to handle non-Inet proxy address: "+p.address());
}
final InetSocketAddress isa = (InetSocketAddress) p.address();
// assume default scheme (http)
result = new HttpHost(getHost(isa), isa.getPort());
}
return result;
}
/**
* Obtains a host from an {@link InetSocketAddress}.
*
* @param isa the socket address
*
* @return a host string, either as a symbolic name or
* as a literal IP address string
*
* (TODO: determine format for IPv6 addresses, with or without [brackets])
*
*/
protected String getHost(final InetSocketAddress isa) {
//@@@ Will this work with literal IPv6 addresses, or do we
//@@@ need to wrap these in [] for the string representation?
//@@@ Having it in this method at least allows for easy workarounds.
return isa.isUnresolved() ?
isa.getHostName() : isa.getAddress().getHostAddress();
}
/**
* Chooses a proxy from a list of available proxies.
* The default implementation just picks the first non-SOCKS proxy
* from the list. If there are only SOCKS proxies,
* {@link Proxy#NO_PROXY Proxy.NO_PROXY} is returned.
* Derived classes may implement more advanced strategies,
* such as proxy rotation if there are multiple options.
*
* @param proxies the list of proxies to choose from,
* never {@code null} or empty
* @param target the planned target, never {@code null}
* @param request the request to be sent, never {@code null}
* @param context the context, or {@code null}
*
* @return a proxy type
*/
protected Proxy chooseProxy(final List proxies,
final HttpHost target,
final HttpRequest request,
final HttpContext context) {
Args.notEmpty(proxies, "List of proxies");
Proxy result = null;
// check the list for one we can use
for (int i=0; (result == null) && (i < proxies.size()); i++) {
final Proxy p = proxies.get(i);
switch (p.type()) {
case DIRECT:
case HTTP:
result = p;
break;
case SOCKS:
// SOCKS hosts are not handled on the route level.
// The socket may make use of the SOCKS host though.
break;
}
}
if (result == null) {
//@@@ log as warning or info that only a socks proxy is available?
// result can only be null if all proxies are socks proxies
// socks proxies are not handled on the route planning level
result = Proxy.NO_PROXY;
}
return result;
}
}