add HttpURLConnection proxy

library/src/main/java/com/danikula/videocache/Config.java

@@ -6,6 +6,7 @@
 import com.danikula.videocache.sourcestorage.SourceInfoStorage;
 
 import java.io.File;
+import java.net.Proxy;
 
 /**
  * Configuration for proxy cache.
@@ -19,13 +20,15 @@ class Config {
     public final DiskUsage diskUsage;
     public final SourceInfoStorage sourceInfoStorage;
     public final HeaderInjector headerInjector;
+    public final Proxy proxy;
 
-    Config(File cacheRoot, FileNameGenerator fileNameGenerator, DiskUsage diskUsage, SourceInfoStorage sourceInfoStorage, HeaderInjector headerInjector) {
+    Config(File cacheRoot, FileNameGenerator fileNameGenerator, DiskUsage diskUsage, SourceInfoStorage sourceInfoStorage, HeaderInjector headerInjector, Proxy proxy) {
         this.cacheRoot = cacheRoot;
         this.fileNameGenerator = fileNameGenerator;
         this.diskUsage = diskUsage;
         this.sourceInfoStorage = sourceInfoStorage;
         this.headerInjector = headerInjector;
+        this.proxy = proxy;
     }
 
     File generateCacheFile(String url) {

library/src/main/java/com/danikula/videocache/HttpProxyCacheServer.java

@@ -19,6 +19,7 @@
 import java.io.File;
 import java.io.IOException;
 import java.net.InetAddress;
+import java.net.Proxy;
 import java.net.ServerSocket;
 import java.net.Socket;
 import java.net.SocketException;
@@ -353,6 +354,7 @@ public static final class Builder {
         private DiskUsage diskUsage;
         private SourceInfoStorage sourceInfoStorage;
         private HeaderInjector headerInjector;
+        private Proxy proxy;
 
         public Builder(Context context) {
             this.sourceInfoStorage = SourceInfoStorageFactory.newSourceInfoStorage(context);
@@ -441,6 +443,12 @@ public Builder headerInjector(HeaderInjector headerInjector) {
             return this;
         }
 
+
+        public Builder proxy(Proxy proxy) {
+            this.proxy = checkNotNull(proxy);
+            return this;
+        }
+
         /**
          * Builds new instance of {@link HttpProxyCacheServer}.
          *
@@ -452,7 +460,7 @@ public HttpProxyCacheServer build() {
         }
 
         private Config buildConfig() {
-            return new Config(cacheRoot, fileNameGenerator, diskUsage, sourceInfoStorage, headerInjector);
+            return new Config(cacheRoot, fileNameGenerator, diskUsage, sourceInfoStorage, headerInjector, proxy);
         }
 
     }

library/src/main/java/com/danikula/videocache/HttpProxyCacheServerClients.java

@@ -79,7 +79,7 @@ public int getClientsCount() {
     }
 
     private HttpProxyCache newHttpProxyCache() throws ProxyCacheException {
-        HttpUrlSource source = new HttpUrlSource(url, config.sourceInfoStorage, config.headerInjector);
+        HttpUrlSource source = new HttpUrlSource(url, config.sourceInfoStorage, config.headerInjector, config.proxy);
         FileCache cache = new FileCache(config.generateCacheFile(url), config.diskUsage);
         HttpProxyCache httpProxyCache = new HttpProxyCache(source, cache);
         httpProxyCache.registerCacheListener(uiCacheListener);

library/src/main/java/com/danikula/videocache/HttpUrlSource.java

@@ -15,6 +15,7 @@
 import java.io.InputStream;
 import java.io.InterruptedIOException;
 import java.net.HttpURLConnection;
+import java.net.Proxy;
 import java.net.URL;
 import java.util.Map;
 
@@ -38,6 +39,7 @@ public class HttpUrlSource implements Source {
     private static final int MAX_REDIRECTS = 5;
     private final SourceInfoStorage sourceInfoStorage;
     private final HeaderInjector headerInjector;
+    public final Proxy proxy;
     private SourceInfo sourceInfo;
     private HttpURLConnection connection;
     private InputStream inputStream;
@@ -47,12 +49,13 @@ public HttpUrlSource(String url) {
     }
 
     public HttpUrlSource(String url, SourceInfoStorage sourceInfoStorage) {
-        this(url, sourceInfoStorage, new EmptyHeadersInjector());
+        this(url, sourceInfoStorage, new EmptyHeadersInjector(),null);
     }
 
-    public HttpUrlSource(String url, SourceInfoStorage sourceInfoStorage, HeaderInjector headerInjector) {
+    public HttpUrlSource(String url, SourceInfoStorage sourceInfoStorage, HeaderInjector headerInjector, Proxy proxy) {
         this.sourceInfoStorage = checkNotNull(sourceInfoStorage);
         this.headerInjector = checkNotNull(headerInjector);
+        this.proxy = proxy;
         SourceInfo sourceInfo = sourceInfoStorage.get(url);
         this.sourceInfo = sourceInfo != null ? sourceInfo :
                 new SourceInfo(url, Integer.MIN_VALUE, ProxyCacheUtils.getSupposablyMime(url));
@@ -62,6 +65,7 @@ public HttpUrlSource(HttpUrlSource source) {
         this.sourceInfo = source.sourceInfo;
         this.sourceInfoStorage = source.sourceInfoStorage;
         this.headerInjector = source.headerInjector;
+        this.proxy = null;
     }
 
     @Override
@@ -159,7 +163,8 @@ private HttpURLConnection openConnection(long offset, int timeout) throws IOExce
         String url = this.sourceInfo.url;
         do {
             LOG.debug("Open connection " + (offset > 0 ? " with offset " + offset : "") + " to " + url);
-            connection = (HttpURLConnection) new URL(url).openConnection();
+            if (proxy == null)connection = (HttpURLConnection) new URL(url).openConnection();
+            else connection = (HttpURLConnection) new URL(url).openConnection(proxy);
             injectCustomHeaders(connection, url);
             if (offset > 0) {
                 connection.setRequestProperty("Range", "bytes=" + offset + "-");