Add proxy

Author: Vladimir Orekhov

libs/sparkpost-lib/src/main/java/com/sparkpost/Client.java

@@ -1,6 +1,8 @@
 
 package com.sparkpost;
 
+import java.net.InetSocketAddress;
+import java.net.Proxy;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -107,6 +109,16 @@ public int getHttpConnectTimeout() {
         return this.httpConnectTimeout;
     }
 
+    private Proxy proxy = null;
+
+    public void setProxy(String hostname, int port) {
+        proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(hostname, port));
+    }
+
+    public Proxy getProxy() {
+        return this.proxy;
+    }
+
     /**
      * Sets a specified timeout value, in milliseconds, to be used
      * when opening a communications link to the resource referenced

libs/sparkpost-lib/src/main/java/com/sparkpost/transport/RestConnection.java

@@ -115,7 +115,12 @@ private HttpURLConnection createConnectionObject(String path, Method method) thr
             // Retrieve the URLConnection object (but doesn't actually connect):
             // (HttpUrlConnection doesn't connect to the server until we've
             // got one of its streams)
-            conn = (HttpURLConnection) url.openConnection();
+            if(this.client.getProxy() != null) {
+                System.out.println("Using proxy here!");
+                conn = (HttpURLConnection) url.openConnection(this.client.getProxy());
+            } else {
+                conn = (HttpURLConnection) url.openConnection();
+            }
 
             conn.setConnectTimeout(this.client.getHttpConnectTimeout());
             conn.setReadTimeout(this.client.getHttpReadTimeout());