Support connecting through an HTTP Proxy

Author: Ed Hillmann

core/azure-core/src/main/java/com/microsoft/windowsazure/Configuration.java

@@ -45,6 +45,18 @@ public class Configuration {
      */
     public static final String PROPERTY_LOG_HTTP_REQUESTS = "com.microsoft.windowsazure.Configuration.logHttpRequests";
 
+    /**
+     * Property name to control whether the Rest client uses a Proxy connection to the remote resources.  Defines the host
+     * of the proxy to use
+     */
+    public static final String PROPERTY_HTTP_PROXY_HOST = "http.proxyHost";
+    
+    /**
+     * Property name to control whether the Rest client uses a Proxy connection to the remote resources.  Defines the port
+     * of the proxy to use
+     */
+    public static final String PROPERTY_HTTP_PROXY_PORT = "http.proxyPort";
+    
     /**
      * The configuration instance.
      */

core/azure-core/src/main/java/com/microsoft/windowsazure/core/pipeline/jersey/Exports.java

@@ -24,6 +24,7 @@
 import java.util.Map;
 
 import static com.microsoft.windowsazure.core.utils.ExportUtils.getPropertyIfExists;
+import com.sun.jersey.client.urlconnection.URLConnectionClientHandler;
 
 public class Exports implements Builder.Exports {
 
@@ -69,7 +70,18 @@ public <S> Client create(String profile, Class<S> service,
                         ClientConfig.class, properties);
                 ClientConfigSettings settings = builder.build(profile, service,
                         ClientConfigSettings.class, properties);
-                Client client = Client.create(clientConfig);
+                Client client;
+                String proxyHost = (String) getPropertyIfExists(profile,
+                        properties, Configuration.PROPERTY_HTTP_PROXY_HOST);
+                Integer proxyPort = (Integer) getPropertyIfExists(profile,
+                        properties, Configuration.PROPERTY_HTTP_PROXY_PORT);
+                if ((proxyHost != null) && (proxyPort != null)) {
+                    URLConnectionClientHandler clientHandler = new URLConnectionClientHandler(
+                        new ProxyConnectionFactory(proxyHost, proxyPort));
+                    client = new Client(clientHandler, clientConfig);
+                } else {
+                    client = Client.create(clientConfig);
+                }
                 settings.applyConfig(client);
                 return client;
             }

core/azure-core/src/main/java/com/microsoft/windowsazure/core/pipeline/jersey/ProxyConnectionFactory.java

@@ -0,0 +1,46 @@
+/*
+ * Licensed 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.
+ */
+package com.microsoft.windowsazure.core.pipeline.jersey;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.InetSocketAddress;
+import java.net.Proxy;
+import java.net.URL;
+
+import com.sun.jersey.client.urlconnection.HttpURLConnectionFactory;
+
+/**
+ * Extends <code>HttpURLConnectionFactory</code> so that an HTTP Proxy can be used when connecting to the
+ * remote resource.
+ *
+ * @author Ed Hillmann
+ */
+public class ProxyConnectionFactory implements HttpURLConnectionFactory {
+
+    private final String proxyHost;
+    private final int proxyPort;
+    
+    public ProxyConnectionFactory(String proxyHost, int proxyPort) {
+        this.proxyHost = proxyHost;
+        this.proxyPort = proxyPort;
+    }
+    
+    @Override
+    public HttpURLConnection getHttpURLConnection(URL url) throws IOException {
+        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
+        return (HttpURLConnection) url.openConnection(proxy);
+    }
+
+}