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From rola...@apache.org
Subject svn commit: r606452 - /httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java
Date Sat, 22 Dec 2007 14:08:57 GMT
Author: rolandw
Date: Sat Dec 22 06:08:56 2007
New Revision: 606452

URL: http://svn.apache.org/viewvc?rev=606452&view=rev
Log:
HTTPCLIENT-723: initial implementation, completely untested

Added:
    httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java
  (with props)

Added: httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java
URL: http://svn.apache.org/viewvc/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java?rev=606452&view=auto
==============================================================================
--- httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java
(added)
+++ httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java
Sat Dec 22 06:08:56 2007
@@ -0,0 +1,262 @@
+/*
+ * $HeadURL$
+ * $Revision$
+ * $Date$
+ *
+ * ====================================================================
+ * 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
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.http.impl.conn;
+
+
+import java.net.InetAddress;
+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 org.apache.http.HttpException;
+import org.apache.http.HttpHost;
+import org.apache.http.HttpRequest;
+import org.apache.http.protocol.HttpContext;
+
+import org.apache.http.conn.ClientConnectionManager;
+import org.apache.http.conn.HttpRoute;
+import org.apache.http.conn.HttpRoutePlanner;
+import org.apache.http.conn.Scheme;
+
+import org.apache.http.conn.params.ConnRoutePNames;
+
+
+/**
+ * Default implementation of an {@link HttpRoutePlanner}.
+ * This implementation is based on {@link java.net.ProxySelector}.
+ * By default, it will pick up the proxy settings of the JVM, either
+ * from system properties or from the browser running the application.
+ * Additionally, it interprets some {@link ConnRoutePNames parameters},
+ * though not the {@link ConnRoutePNames#DEFAULT_PROXY DEFAULT_PROXY}.
+ */
+public class ProxySelectorRoutePlanner implements HttpRoutePlanner {
+    
+    private ClientConnectionManager connectionManager;
+    
+    public ProxySelectorRoutePlanner(ClientConnectionManager aConnManager) {
+        setConnectionManager(aConnManager);
+    }
+
+
+    // default constructor
+
+    
+    public void setConnectionManager(ClientConnectionManager aConnManager) {
+        this.connectionManager = aConnManager;
+    }
+
+
+    // non-javadoc, see interface HttpRoutePlanner
+    public HttpRoute determineRoute(HttpHost target,
+                                    HttpRequest request,
+                                    HttpContext context)
+        throws HttpException {
+
+        if (request == null) {
+            throw new IllegalStateException
+                ("Request must not be null.");
+        }
+
+        // If we have a forced route, we can do without a target.
+        // Check the context first, it might have been set by a retry handler.
+        HttpRoute route = null;
+        if (context != null) {
+            route = (HttpRoute)
+                context.getAttribute(ConnRoutePNames.FORCED_ROUTE);
+        }
+        if (route == null) {
+            route = (HttpRoute)
+                request.getParams().getParameter(ConnRoutePNames.FORCED_ROUTE);
+        }
+
+        if (route != null)
+            return route;
+
+        // If we get here, there is no forced route.
+        // So we need a target to compute a route.
+
+        if (target == null) {
+            throw new IllegalStateException
+                ("Target host must not be null.");
+        }
+
+        final InetAddress local = (InetAddress)
+            request.getParams().getParameter(ConnRoutePNames.LOCAL_ADDRESS);
+        final HttpHost proxy = determineProxy(target, request, context);
+
+        final Scheme schm = this.connectionManager.getSchemeRegistry().
+            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</code>
+     * @param request   the request to be sent, never <code>null</code>
+     * @param context   the context, or <code>null</code>
+     *
+     * @return  the proxy to use, or <code>null</code> for a direct route
+     *
+     * @throws HttpException
+     *         in case of system proxy settings that cannot be handled
+     */
+    protected HttpHost determineProxy(HttpHost    target,
+                                      HttpRequest request,
+                                      HttpContext context)
+        throws HttpException {
+
+        // the proxy selector can be 'unset', so we better deal with null here
+        final ProxySelector psel = ProxySelector.getDefault();
+        if (psel == null)
+            return null;
+
+        URI targetURI = null;
+        try {
+            targetURI = new URI(target.toURI());
+        } catch (URISyntaxException usx) {
+            throw new HttpException
+                ("Cannot convert host to URI: " + target, usx);
+        }
+        List<Proxy> proxies = psel.select(targetURI);
+
+        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
+     * <br/>
+     * (TODO: determine format for IPv6 addresses, with or without [brackets])
+     */
+    protected String getHost(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</code> or empty
+     * @param target    the planned target, never <code>null</code>
+     * @param request   the request to be sent, never <code>null</code>
+     * @param context   the context, or <code>null</code>
+     *
+     * @return  a proxy of type {@link Proxy.Type#DIRECT DIRECT}
+     *          or {@link Proxy.Type#HTTP HTTP}, never <code>null</code>
+     */
+    protected Proxy chooseProxy(List<Proxy> proxies,
+                                HttpHost    target,
+                                HttpRequest request,
+                                HttpContext context) {
+
+        if ((proxies == null) || proxies.isEmpty()) {
+            throw new IllegalArgumentException
+                ("Proxy list must not be empty.");
+        }
+
+        Proxy result = null;
+
+        // check the list for one we can use
+        for (int i=0; (result == null) && (i < proxies.size()); i++) {
+
+            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;
+    }
+
+} // class ProxySelectorRoutePlanner
+

Propchange: httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/conn/ProxySelectorRoutePlanner.java
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