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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* SPDX-License-Identifier: GPL-2.0-or-later
*/
package com.wireguard.android.activity;
import android.content.Intent;
import android.databinding.CallbackRegistry;
import android.databinding.CallbackRegistry.NotifierCallback;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import com.wireguard.android.Application;
import com.wireguard.android.backend.GoBackend;
import com.wireguard.android.model.Tunnel;
import com.wireguard.android.model.TunnelManager;
import com.wireguard.android.util.Topic;
import java.lang.reflect.Field;
import java.util.Objects;
/**
* Base class for activities that need to remember the currently-selected tunnel.
*/
public abstract class BaseActivity extends AppCompatActivity implements Topic.Subscriber {
private static final String TAG = "WireGuard/" + BaseActivity.class.getSimpleName();
private static final String KEY_SELECTED_TUNNEL = "selected_tunnel";
private final SelectionChangeRegistry selectionChangeRegistry = new SelectionChangeRegistry();
private Tunnel selectedTunnel;
public void addOnSelectedTunnelChangedListener(
final OnSelectedTunnelChangedListener listener) {
selectionChangeRegistry.add(listener);
}
public Tunnel getSelectedTunnel() {
return selectedTunnel;
}
@Override
protected void onCreate(final Bundle savedInstanceState) {
subscribeTopics();
// Restore the saved tunnel if there is one; otherwise grab it from the arguments.
String savedTunnelName = null;
if (savedInstanceState != null)
savedTunnelName = savedInstanceState.getString(KEY_SELECTED_TUNNEL);
else if (getIntent() != null)
savedTunnelName = getIntent().getStringExtra(KEY_SELECTED_TUNNEL);
if (savedTunnelName != null) {
final TunnelManager tunnelManager = Application.getComponent().getTunnelManager();
selectedTunnel = tunnelManager.getTunnels().get(savedTunnelName);
}
// The selected tunnel must be set before the superclass method recreates fragments.
super.onCreate(savedInstanceState);
if (Application.getComponent().getBackendType() == GoBackend.class) {
final Intent intent = GoBackend.VpnService.prepare(this);
if (intent != null) {
startActivityForResult(intent, 0);
}
}
}
@Override
protected void onDestroy() {
unsubscribeTopics();
super.onDestroy();
}
@Override
protected void onSaveInstanceState(final Bundle outState) {
if (selectedTunnel != null)
outState.putString(KEY_SELECTED_TUNNEL, selectedTunnel.getName());
super.onSaveInstanceState(outState);
}
protected abstract void onSelectedTunnelChanged(Tunnel oldTunnel, Tunnel newTunnel);
public void removeOnSelectedTunnelChangedListener(
final OnSelectedTunnelChangedListener listener) {
selectionChangeRegistry.remove(listener);
}
public void setSelectedTunnel(final Tunnel tunnel) {
final Tunnel oldTunnel = selectedTunnel;
if (Objects.equals(oldTunnel, tunnel))
return;
selectedTunnel = tunnel;
onSelectedTunnelChanged(oldTunnel, tunnel);
selectionChangeRegistry.notifyCallbacks(oldTunnel, 0, tunnel);
}
public interface OnSelectedTunnelChangedListener {
void onSelectedTunnelChanged(Tunnel oldTunnel, Tunnel newTunnel);
}
private static final class SelectionChangeNotifier
extends NotifierCallback<OnSelectedTunnelChangedListener, Tunnel, Tunnel> {
@Override
public void onNotifyCallback(final OnSelectedTunnelChangedListener listener,
final Tunnel oldTunnel, final int ignored,
final Tunnel newTunnel) {
listener.onSelectedTunnelChanged(oldTunnel, newTunnel);
}
}
private static final class SelectionChangeRegistry
extends CallbackRegistry<OnSelectedTunnelChangedListener, Tunnel, Tunnel> {
private SelectionChangeRegistry() {
super(new SelectionChangeNotifier());
}
}
@Override
public void onTopicPublished(Topic topic) {
try {
Field f = getResources().getClass().getDeclaredField("mResourcesImpl");
f.setAccessible(true);
Object o = f.get(getResources());
f = o.getClass().getDeclaredField("mDrawableCache");
f.setAccessible(true);
o = f.get(o);
f = o.getClass().getSuperclass().getDeclaredField("mThemedEntries");
f.setAccessible(true);
o = f.get(o);
o.getClass().getMethod("clear").invoke(o);
} catch (Exception e) {
Log.e(TAG, "Failed to flush icon cache", e);
}
recreate();
}
@Override
public Topic[] getSubscription() {
return new Topic[] { Application.getComponent().getThemeChangeTopic() };
}
}
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