Fix: irmagobridge's Stop method not called on iOS

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Fixed
+- irmagobridge's Stop method is not called on iOS when the app is terminated
 
 ## [7.5.3] - 2023-11-16
 ### Changed

android/app/src/main/java/foundation/privacybydesign/irmamobile/MainActivity.java

@@ -29,13 +29,14 @@ public class MainActivity extends FlutterActivity {
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
-    // We do both these steps before calling parent, to ensure that this always happens before starting the flutter
-    // engine and attaching its plugins
+    // We do both these steps before calling parent, to ensure that this always
+    // happens before starting the flutter engine and attaching its plugins
 
     // Initialize the Go binding here by calling a seemingly noop function
     Irmagobridge.prestart();
 
-    // Capture initial url only during onCreate, for use during first engine instantiation
+    // Capture initial url only during onCreate, for use during first engine
+    // instantiation
     this.initialURL = getIntent().getData();
 
     // Hand of to parent
@@ -48,7 +49,9 @@ public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
     flutterEngine.getPlugins().add(new IIABPlugin());
 
     // Start up the irmamobile bridge
-    MethodChannel channel = new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), "irma.app/irma_mobile_bridge");
+    MethodChannel channel = new MethodChannel(
+        flutterEngine.getDartExecutor().getBinaryMessenger(),
+        "irma.app/irma_mobile_bridge");
     bridge = new IrmaMobileBridge(this, this, channel, initialURL);
     channel.setMethodCallHandler(bridge);
     initialURL = null; // Ensure we only use the initialURL once
@@ -58,12 +61,16 @@ public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
   @Override
   protected void onNewIntent(Intent intent) {
     super.onNewIntent(intent);
-    if (bridge != null) bridge.onNewIntent(intent);
+    if (bridge != null) {
+      bridge.onNewIntent(intent);
+    }
   }
 
   @Override
   protected void onDestroy() {
-    Irmagobridge.stop();
+    if (bridge != null) {
+      bridge.stop();
+    }
     super.onDestroy();
   }
 }

android/app/src/main/java/foundation/privacybydesign/irmamobile/irma_mobile_bridge/IrmaMobileBridge.java

@@ -120,4 +120,8 @@ public void debugLog(String message) {
     if (debug)
       System.out.printf("[IrmaMobileBridgePlugin] %s\n", message);
   }
+
+  public void stop() {
+    Irmagobridge.stop();
+  }
 }

ios/Runner.xcodeproj/project.pbxproj

@@ -714,6 +714,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = foundation.privacybydesign.irmamob.alpha;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "Local development profile";
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_SWIFT3_OBJC_INFERENCE = On;

ios/Runner/IrmaMobileBridgePlugin.swift

@@ -10,7 +10,6 @@ class IrmaMobileBridgePlugin: NSObject, IrmagobridgeIrmaMobileBridgeProtocol, Fl
     private var nativeError: String?
     private var appReady: Bool
 
-
     /// Private constructor. This constructor is called indirectly via register (see below).
     /// - Parameters:
     ///   - channel: Channel to send messages to the Flutter side
@@ -21,7 +20,6 @@ class IrmaMobileBridgePlugin: NSObject, IrmagobridgeIrmaMobileBridgeProtocol, Fl
         super.init()
     }
 
-
     /// Calls the Start method of irmagobridge.
     private func start() {
         let bundlePath = Bundle.main.bundlePath
@@ -54,7 +52,12 @@ class IrmaMobileBridgePlugin: NSObject, IrmagobridgeIrmaMobileBridgeProtocol, Fl
 
         IrmagobridgeStart(self, libraryPath, bundlePath, TEE(), aesKey)
     }
-
+
+    /// Calls the Stop method of irmagobridge.
+    private func stop() {
+        debugLog("Stopping irmago")
+        IrmagobridgeStop()
+    }
 
     /// Implements the register method of the FlutterPlugin interface. This method is called by Flutter to bootstrap the plugin.
     /// - Parameter registrar: Registration context of the Flutter plugin
@@ -68,8 +71,7 @@ class IrmaMobileBridgePlugin: NSObject, IrmagobridgeIrmaMobileBridgeProtocol, Fl
         registrar.addMethodCallDelegate(instance, channel: channel)
         registrar.addApplicationDelegate(instance)
     }
-
-
+
     /// Implements the handle method of the FlutterPlugin interface. This method is called when invokeMethod is called on the plugin's method channel in Flutter/Dart.
     /// - Parameters:
     ///   - call: Object that specifies the method that should be handled and the corresponding arguments
@@ -94,18 +96,16 @@ class IrmaMobileBridgePlugin: NSObject, IrmagobridgeIrmaMobileBridgeProtocol, Fl
         result(nil)
     }
 
-
     /// Implements the DebugLog method of the IrmaMobileBridge interface.
     /// - Parameter message: Message to be logged
     func debugLog(_ message: String?) {
 #if DEBUG
         if message != nil {
-            NSLog("[IrmaMobileBridgePlugin] \(message)")
+            NSLog("[IrmaMobileBridgePlugin] \(message!)")
         }
 #endif
     }
 
-
     /// Implements the DispatchFromGo method of the IrmaMobileBridge interface.
     /// - Parameters:
     ///   - name: name of the method being invoked
@@ -160,4 +160,8 @@ extension IrmaMobileBridgePlugin: FlutterApplicationLifeCycleDelegate {
         }
         return false
     }
+
+    public func applicationWillTerminate(_ application: UIApplication) {
+        stop()
+    }
 }

lib/app.dart

@@ -266,7 +266,11 @@ class AppState extends State<App> with WidgetsBindingObserver {
       ),
       builder: (context, snapshot) {
         if (!snapshot.hasData || !_privacyScreenLoaded) {
-          return const SplashScreen();
+          // Delay the loading indicator a bit, so it doesn't flash on screen.
+          return FutureBuilder(
+            future: Future.delayed(const Duration(seconds: 3), () => true),
+            builder: (context, isLoading) => SplashScreen(isLoading: isLoading.data ?? false),
+          );
         }
 
         final displayRootedWarning = snapshot.data!.a;

lib/src/screens/loading/loading_screen.dart

@@ -49,18 +49,28 @@ class _LoadingScreenState extends State<LoadingScreen> {
   }
 
   @override
-  Widget build(BuildContext context) => StreamBuilder<ErrorEvent>(
-        stream: IrmaRepositoryProvider.of(context).getFatalErrors(),
-        builder: (context, snapshot) {
-          if (snapshot.hasData) {
-            final error = snapshot.data;
-            return ErrorScreen.fromEvent(
-              error: error!,
-            );
-          }
-          return const SplashScreen(
-            isLoading: true,
+  Widget build(BuildContext context) {
+    final repo = IrmaRepositoryProvider.of(context);
+    return StreamBuilder<ErrorEvent>(
+      stream: repo.getFatalErrors().timeout(
+            const Duration(seconds: 15),
+            onTimeout: (_) => repo.dispatch(ErrorEvent(
+              exception: 'Timeout: enrollment status could not be determined within 15 seconds',
+              stack: '',
+              fatal: true,
+            )),
+          ),
+      builder: (context, snapshot) {
+        if (snapshot.hasData) {
+          final error = snapshot.data;
+          return ErrorScreen.fromEvent(
+            error: error!,
           );
-        },
-      );
+        }
+        return const SplashScreen(
+          isLoading: true,
+        );
+      },
+    );
+  }
 }