Fixes problems around holding on to the YubiKey when in background

Author: jdmoreira

Authenticator/Model/MainViewModel.swift

@@ -125,7 +125,12 @@ class MainViewModel: ObservableObject {
             }
         }
     }
-    
+
+    @MainActor func closeConnections() {
+        OATHSessionHandler.shared.smartCardConnection?.stop()
+        OATHSessionHandler.shared.accessoryConnection?.stop()
+    }
+
     @MainActor func stop() {
         sessionTask?.cancel()
         sessionTask = nil

Authenticator/Model/OATHSession.swift

@@ -48,9 +48,9 @@ class OATHSessionHandler: NSObject, YKFManagerDelegate {
 
     typealias ClosingCallback = ((_ error: Error?) -> Void)
 
-    private var nfcConnection: YKFNFCConnection?
-    private var smartCardConnection: YKFSmartCardConnection?
-    private var accessoryConnection: YKFAccessoryConnection?
+    var nfcConnection: YKFNFCConnection?
+    var smartCardConnection: YKFSmartCardConnection?
+    var accessoryConnection: YKFAccessoryConnection?
 
     private var currentSession: YKFOATHSession?
 

Authenticator/UI/MainView.swift

@@ -227,12 +227,12 @@ struct MainView: View {
             }
         }
         .onChange(of: scenePhase) { phase in
-            if phase == .active && didEnterBackground {
-                didEnterBackground = false
+            if phase == .active {
                 model.start() // This is called when app becomes active
-            } else if phase == .background {
-                didEnterBackground = true
+            } else if phase == .background || phase == .inactive {
+                let _ = UIApplication.shared.beginBackgroundTask { }
                 model.stop()
+                model.closeConnections()
             }
         }
         .onChange(of: model.showTouchToast) { showToast in