Fix a bug where Aegis would forcibly pop up after unlocking the device

app/src/main/java/com/beemdevelopment/aegis/AegisApplication.java

@@ -13,19 +13,23 @@ import android.os.Build;
 import com.beemdevelopment.aegis.db.DatabaseManager;
 import com.beemdevelopment.aegis.ui.MainActivity;
 
+import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 
 import androidx.annotation.RequiresApi;
 
 public class AegisApplication extends Application {
     private DatabaseManager _manager;
     private Preferences _prefs;
+    private List<LockListener> _lockListeners;
 
     @Override
     public void onCreate() {
         super.onCreate();
         _manager = new DatabaseManager(this);
         _prefs = new Preferences(this);
+        _lockListeners = new ArrayList<>();
 
         // listen for SCREEN_OFF events
         ScreenOffReceiver receiver = new ScreenOffReceiver();
@@ -44,6 +48,25 @@ public class AegisApplication extends Application {
         return _prefs;
     }
 
+    public boolean isAutoLockEnabled() {
+        return _prefs.isAutoLockEnabled() && _manager.isLoaded() && _manager.isEncryptionEnabled() && !_manager.isLocked();
+    }
+
+    public void registerLockListener(LockListener listener) {
+        _lockListeners.add(listener);
+    }
+
+    public void unregisterLockListener(LockListener listener) {
+        _lockListeners.remove(listener);
+    }
+
+    public void lock() {
+        _manager.lock();
+        for (LockListener listener : _lockListeners) {
+            listener.onLocked();
+        }
+    }
+
     @RequiresApi(api = Build.VERSION_CODES.N_MR1)
     private void initAppShortcuts() {
         ShortcutManager shortcutManager = getSystemService(ShortcutManager.class);
@@ -65,19 +88,16 @@ public class AegisApplication extends Application {
         shortcutManager.setDynamicShortcuts(Collections.singletonList(shortcut));
     }
 
-    public boolean isAutoLockEnabled() {
-        return _prefs.isAutoLockEnabled() && _manager.isLoaded() && _manager.isEncryptionEnabled() && !_manager.isLocked();
-    }
-
     private class ScreenOffReceiver extends BroadcastReceiver {
         @Override
         public void onReceive(Context context, Intent intent) {
             if (isAutoLockEnabled()) {
-                _manager.lock();
+                lock();
-                Intent newIntent = new Intent(getApplicationContext(), MainActivity.class);
-                newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
-                startActivity(newIntent);
             }
         }
     }
+
+    public interface LockListener {
+        void onLocked();
+    }
 }

app/src/main/java/com/beemdevelopment/aegis/ui/AegisActivity.java

@@ -13,9 +13,10 @@ import com.beemdevelopment.aegis.Preferences;
 import com.beemdevelopment.aegis.R;
 import com.beemdevelopment.aegis.Theme;
 
+import androidx.annotation.CallSuper;
 import androidx.appcompat.app.AppCompatActivity;
 
-public abstract class AegisActivity extends AppCompatActivity {
+public abstract class AegisActivity extends AppCompatActivity implements AegisApplication.LockListener {
     private AegisApplication _app;
 
     @Override
@@ -27,11 +28,10 @@ public abstract class AegisActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
 
         // if the app was killed, relaunch MainActivity and close everything else
-        if (!(this instanceof MainActivity) && !(this instanceof AuthActivity) && _app.getDatabaseManager().isLocked()) {
+        if (savedInstanceState != null && isOrphan()) {
             Intent intent = new Intent(this, MainActivity.class);
             intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
             startActivity(intent);
-            finish();
             return;
         }
 
@@ -42,6 +42,24 @@ public abstract class AegisActivity extends AppCompatActivity {
 
         // apply a dirty hack to make progress bars work even if animations are disabled
         setGlobalAnimationDurationScale();
+
+        // register a callback to listen for lock events
+        _app.registerLockListener(this);
+    }
+
+    @Override
+    protected void onDestroy() {
+        _app.unregisterLockListener(this);
+        super.onDestroy();
+    }
+
+    @CallSuper
+    @Override
+    public void onLocked() {
+        if (isOrphan()) {
+            setResult(RESULT_CANCELED, null);
+            finish();
+        }
     }
 
     protected AegisApplication getApp() {
@@ -66,6 +84,14 @@ public abstract class AegisActivity extends AppCompatActivity {
         }
     }
 
+    /**
+     * Reports whether this Activity instance has become an orphan. This can happen if
+     * the vault was locked by an external trigger while the Activity was still open.
+     */
+    private boolean isOrphan() {
+        return !(this instanceof MainActivity) && _app.getDatabaseManager().isLocked();
+    }
+
     private void setGlobalAnimationDurationScale() {
         float durationScale = Settings.Global.getFloat(getContentResolver(), Settings.Global.ANIMATOR_DURATION_SCALE, 0);
         if (durationScale != 1) {

app/src/main/java/com/beemdevelopment/aegis/ui/MainActivity.java

@@ -147,6 +147,11 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
             return;
         }
 
+        // don't process any activity results if the vault is locked
+        if (requestCode != CODE_DECRYPT && _db.isLocked()) {
+            return;
+        }
+
         switch (requestCode) {
             case CODE_SCAN:
                 onScanResult(resultCode, data);
@@ -371,10 +376,6 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
         intent.removeExtra("action");
     }
 
-    public void startActivityForResult(Intent intent, int requestCode) {
-        super.startActivityForResult(intent, requestCode);
-    }
-
     @Override
     protected void onResume() {
         super.onResume();
@@ -411,7 +412,7 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
     @Override
     public void onBackPressed() {
         if (_app.isAutoLockEnabled()) {
-            lockDatabase();
+            _app.lock();
         }
 
         super.onBackPressed();
@@ -481,7 +482,7 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
                 startActivityForResult(intent, CODE_PREFERENCES);
                 return true;
             case R.id.action_lock:
-                lockDatabase();
+                _app.lock();
                 startAuthActivity();
                 return true;
             default:
@@ -525,14 +526,6 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
         }
     }
 
-    private void lockDatabase() {
-        if (_loaded) {
-            _entryListView.clearEntries();
-            _db.lock();
-            _loaded = false;
-        }
-    }
-
     private void unlockDatabase(DatabaseFileCredentials creds) {
         if (_loaded) {
             return;
@@ -570,6 +563,7 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
     private void startAuthActivity() {
         Intent intent = new Intent(this, AuthActivity.class);
         intent.putExtra("slots", _db.getFileHeader().getSlots());
+        intent.putExtra("requiresUnlock", false);
         startActivityForResult(intent, CODE_DECRYPT);
     }
 
@@ -613,4 +607,11 @@ public class MainActivity extends AegisActivity implements EntryListView.Listene
     public void onScroll(int dx, int dy) {
         _fabScrollHelper.onScroll(dx, dy);
     }
+
+    @Override
+    public void onLocked() {
+        _entryListView.clearEntries();
+        _loaded = false;
+        super.onLocked();
+    }
 }