tunnel: download pac in java

2 files changed, 38 insertions, 5 deletions

diff --git a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
index c4c8f70a..f66b6cc5 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -65,6 +65,9 @@ import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
 import java.net.InetAddress;
 import java.net.Inet4Address;
 import java.net.Inet6Address;
@@ -296,12 +299,38 @@ public final class GoBackend implements Backend {
         return getState(tunnel);
     }
 
-    private int startHttpProxy(Uri pacFileUrl) {
+    private static String downloadPacFile(Network network, Uri pacFileUrl) {
+        HttpURLConnection urlConnection = null;
+        StringBuffer buf = new StringBuffer();
+        try {
+            URL url = new URL(pacFileUrl.toString());
+            urlConnection = (HttpURLConnection) network.openConnection(url);
+
+            InputStream in = urlConnection.getInputStream();
+            InputStreamReader isw = new InputStreamReader(in);
+
+            int data = isw.read();
+            while (data != -1) {
+                char current = (char) data;
+                data = isw.read();
+                buf.append(current);
+            }
+        } catch (Exception e) {
+        } finally {
+            if (urlConnection != null) {
+                urlConnection.disconnect();
+            }
+        }
+
+        return buf.toString();
+    }
+
+    private int startHttpProxy(String pacFile) {
         LibwgGrpc.LibwgStub asyncStub = LibwgGrpc.newStub(channel);
         LibwgGrpc.LibwgBlockingStub stub = LibwgGrpc.newBlockingStub(channel);
         StartHttpProxyRequest.Builder reqBuilder = StartHttpProxyRequest.newBuilder();
-        if (pacFileUrl != null && pacFileUrl != Uri.EMPTY) {
-            reqBuilder.setPacFileUrl(pacFileUrl.toString());
+        if (pacFile != null && pacFile != "") {
+            reqBuilder.setPacFileContent(pacFile);
         }
 
         Thread streamer = new Thread(new Runnable() {
@@ -538,7 +567,8 @@ public final class GoBackend implements Backend {
 
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
                     if (pacFileUrl != null && pacFileUrl != Uri.EMPTY) {
-                        int listenPort = startHttpProxy(pacFileUrl);
+                        String pacFile = downloadPacFile(activeNetwork, pacFileUrl);
+                        int listenPort = startHttpProxy(pacFile);
                         ProxyInfo localPi = ProxyInfo.buildDirectProxy("localhost", listenPort);
                         builder.setHttpProxy(localPi);
                     } else {
diff --git a/tunnel/src/main/proto/libwg.proto b/tunnel/src/main/proto/libwg.proto
index 90c4f46a..4fa4468b 100644
--- a/tunnel/src/main/proto/libwg.proto
+++ b/tunnel/src/main/proto/libwg.proto
@@ -56,7 +56,10 @@ message VersionResponse {
 }
 
 message StartHttpProxyRequest {
-	string pacFileUrl = 1;
+	oneof pacFile {
+		string pacFileUrl = 1;
+		string pacFileContent = 2;
+        }
 }
 
 message StartHttpProxyResponse {