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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and
asynchronously process the HTTP responses.
/*
* Copyright (c) 2010-2012 Sonatype, Inc. All rights reserved.
*
* This program is licensed to you under the Apache License Version 2.0,
* and you may not use this file except in compliance with the Apache License Version 2.0.
* You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the Apache License Version 2.0 is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
*/
package com.ning.http.util;
import com.ning.http.client.AsyncHttpClientConfig;
import com.ning.http.client.ProxyServer;
import com.ning.http.client.ProxyServer.Protocol;
import com.ning.http.client.uri.Uri;
import com.ning.http.client.ProxyServerSelector;
import com.ning.http.client.Request;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utilities for Proxy handling.
*
* @author cstamas
*/
public final class ProxyUtils {
private final static Logger log = LoggerFactory.getLogger(ProxyUtils.class);
private static final String PROPERTY_PREFIX = "com.ning.http.client.AsyncHttpClientConfig.proxy.";
/**
* The host to use as proxy.
*/
public static final String PROXY_HOST = "http.proxyHost";
/**
* The port to use for the proxy.
*/
public static final String PROXY_PORT = "http.proxyPort";
/**
* The protocol to use. Is mapped to the {@link Protocol} enum.
*/
public static final String PROXY_PROTOCOL = PROPERTY_PREFIX + "protocol";
/**
* A specification of non-proxy hosts. See http://download.oracle.com/javase/1.4.2/docs/guide/net/properties.html
*/
public static final String PROXY_NONPROXYHOSTS = "http.nonProxyHosts";
/**
* The username to use for authentication for the proxy server.
*/
public static final String PROXY_USER = PROPERTY_PREFIX + "user";
/**
* The password to use for authentication for the proxy server.
*/
public static final String PROXY_PASSWORD = PROPERTY_PREFIX + "password";
private ProxyUtils() {
}
/**
* @param config the global config
* @param request the request
* @return the proxy server to be used for this request (can be null)
*/
public static ProxyServer getProxyServer(AsyncHttpClientConfig config, Request request) {
ProxyServer proxyServer = request.getProxyServer();
if (proxyServer == null) {
ProxyServerSelector selector = config.getProxyServerSelector();
if (selector != null) {
proxyServer = selector.select(request.getUri());
}
}
return ProxyUtils.avoidProxy(proxyServer, request) ? null : proxyServer;
}
/**
* @see #avoidProxy(ProxyServer, String)
*/
public static boolean avoidProxy(final ProxyServer proxyServer, final Request request) {
return avoidProxy(proxyServer, request.getUri().getHost());
}
private static boolean matchNonProxyHost(String targetHost, String nonProxyHost) {
if (nonProxyHost.length() > 1) {
if (nonProxyHost.charAt(0) == '*')
return targetHost.regionMatches(true, targetHost.length() - nonProxyHost.length() + 1, nonProxyHost, 1,
nonProxyHost.length() - 1);
else if (nonProxyHost.charAt(nonProxyHost.length() - 1) == '*')
return targetHost.regionMatches(true, 0, nonProxyHost, 0, nonProxyHost.length() - 1);
}
return nonProxyHost.equalsIgnoreCase(targetHost);
}
/**
* Checks whether proxy should be used according to nonProxyHosts settings of it, or we want to go directly to
* target host. If null 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 hostname 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 hostname) {
if (proxyServer != null) {
if (hostname == null)
throw new NullPointerException("hostname");
List nonProxyHosts = proxyServer.getNonProxyHosts();
if (nonProxyHosts != null) {
for (String nonProxyHost : nonProxyHosts) {
if (matchNonProxyHost(hostname, nonProxyHost))
return true;
}
}
return false;
} else {
return true;
}
}
/**
* Creates a proxy server instance from the given properties.
* 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 Networking Properties
* @see #PROXY_HOST
* @see #PROXY_PORT
* @see #PROXY_PROTOCOL
* @see #PROXY_NONPROXYHOSTS
*/
public static ProxyServerSelector createProxyServerSelector(Properties properties) {
String host = properties.getProperty(PROXY_HOST);
if (host != null) {
int port = Integer.valueOf(properties.getProperty(PROXY_PORT, "80"));
Protocol protocol;
try {
protocol = Protocol.valueOf(properties.getProperty(PROXY_PROTOCOL, "HTTP"));
} catch (IllegalArgumentException e) {
protocol = Protocol.HTTP;
}
ProxyServer proxyServer = new ProxyServer(protocol, host, port, properties.getProperty(PROXY_USER),
properties.getProperty(PROXY_PASSWORD));
String nonProxyHosts = properties.getProperty(PROXY_NONPROXYHOSTS);
if (nonProxyHosts != null) {
for (String spec : nonProxyHosts.split("\\|")) {
proxyServer.addNonProxyHost(spec);
}
}
return createProxyServerSelector(proxyServer);
}
return ProxyServerSelector.NO_PROXY_SELECTOR;
}
/**
* Get a proxy server selector based on the JDK default proxy selector.
*
* @return The proxy server selector.
*/
public static ProxyServerSelector getJdkDefaultProxyServerSelector() {
return createProxyServerSelector(ProxySelector.getDefault());
}
/**
* Create a proxy server selector based on the passed in JDK proxy selector.
*
* @param proxySelector The proxy selector to use. Must not be null.
* @return The proxy server selector.
*/
public static ProxyServerSelector createProxyServerSelector(final ProxySelector proxySelector) {
return new ProxyServerSelector() {
public ProxyServer select(Uri uri) {
try {
URI javaUri = uri.toJavaNetURI();
List proxies = proxySelector.select(javaUri);
if (proxies != null) {
// Loop through them until we find one that we know how to use
for (Proxy proxy : proxies) {
switch (proxy.type()) {
case HTTP:
if (!(proxy.address() instanceof InetSocketAddress)) {
log.warn("Don't know how to connect to address " + proxy.address());
return null;
} else {
InetSocketAddress address = (InetSocketAddress) proxy.address();
return new ProxyServer(Protocol.HTTP, address.getHostName(), address.getPort());
}
case DIRECT:
return null;
default:
log.warn("ProxySelector returned proxy type that we don't know how to use: " + proxy.type());
break;
}
}
}
return null;
} catch (URISyntaxException e) {
log.warn(uri + " couldn't be turned into a java.net.URI", e);
return null;
}
}
};
}
/**
* Create a proxy server selector that always selects a single proxy server.
*
* @param proxyServer The proxy server to select.
* @return The proxy server selector.
*/
public static ProxyServerSelector createProxyServerSelector(final ProxyServer proxyServer) {
return new ProxyServerSelector() {
public ProxyServer select(Uri uri) {
return proxyServer;
}
};
}
}
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