From 2b6963e2da92465d45299816e630c0e925879e53 Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Fri, 24 Feb 2023 23:55:03 +0100
Subject: tunnel: download pac in java

---
 .../com/wireguard/android/backend/GoBackend.java   | 38 +++++++++++++++++++---
 tunnel/src/main/proto/libwg.proto                  |  5 ++-
 tunnel/tools/libwg-go/http-proxy.go                | 14 ++++++++
 tunnel/tools/libwg-go/service.go                   | 23 ++++++++-----
 4 files changed, 67 insertions(+), 13 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 183687f7..2a97f1f8 100644
--- a/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
+++ b/tunnel/src/main/java/com/wireguard/android/backend/GoBackend.java
@@ -67,6 +67,9 @@ 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;
@@ -307,12 +310,38 @@ 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() {
@@ -549,7 +578,8 @@ 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 {
diff --git a/tunnel/tools/libwg-go/http-proxy.go b/tunnel/tools/libwg-go/http-proxy.go
index a44aaac6..9c457286 100644
--- a/tunnel/tools/libwg-go/http-proxy.go
+++ b/tunnel/tools/libwg-go/http-proxy.go
@@ -454,6 +454,20 @@ func (p *HttpProxy) SetPacFileUrl(pacFileUrl *url.URL) error {
 	return nil
 }
 
+func (p *HttpProxy) SetPacFileContent(pacFile string) error {
+	ctx := newPacBodyCtx(pacFile, p.logger)
+
+	for _, handler := range(p.handlers) {
+		handler.setPacCtx(ctx)
+	}
+
+	if p.ctx != nil {
+		p.ctx.Destroy()
+	}
+	p.ctx = ctx
+	return nil
+}
+
 func (p *HttpProxy) Start() (listen_port uint16, err error) {
 	p.logger.Verbosef("HttpProxy.Start()")
 	listen_port = 0
diff --git a/tunnel/tools/libwg-go/service.go b/tunnel/tools/libwg-go/service.go
index e49081e7..f5460486 100644
--- a/tunnel/tools/libwg-go/service.go
+++ b/tunnel/tools/libwg-go/service.go
@@ -121,14 +121,21 @@ func (e *LibwgServiceImpl) StartHttpProxy(ctx context.Context, req *gen.StartHtt
 		listenPort = e.httpProxy.GetAddrPort().Port()
 	}
 
-	pacFileUrl, err := url.Parse(req.PacFileUrl)
-	if err != nil {
-		return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, req.PacFileUrl))
-	}
-
-	err = e.httpProxy.SetPacFileUrl(pacFileUrl)
-	if err != nil {
-		return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", req.PacFileUrl))
+	content := req.GetPacFileContent()
+	if content != "" {
+		err := e.httpProxy.SetPacFileContent(content)
+		if err != nil {
+			return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileContent: %v (%s)", content))
+		}
+	} else {
+		pacFileUrl, err := url.Parse(req.GetPacFileUrl())
+		if err != nil {
+			return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, req.GetPacFileUrl()))
+		}
+		err = e.httpProxy.SetPacFileUrl(pacFileUrl)
+		if err != nil {
+			return buildStartHttpProxyError(fmt.Sprintf("Bad pacFileUrl: %v (%s)", err, pacFileUrl))
+		}
 	}
 
 	r := &gen.StartHttpProxyResponse{
-- 
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