turn off macos sandbox mode; ffi refactor to get library path so isolate polling appbus events always gets new platform updates

lib/cwtch/ffi.dart

@@ -59,25 +59,35 @@ typedef GetJsonBlobFromStrStrStrFn = Pointer<Utf8> Function(Pointer<Utf8>, int,
 typedef appbus_events_function = Pointer<Utf8> Function();
 typedef AppbusEventsFn = Pointer<Utf8> Function();
 
+const String UNSUPPORTED_OS = "unsupported-os";
+
 class CwtchFfi implements Cwtch {
   late DynamicLibrary library;
   late CwtchNotifier cwtchNotifier;
   late Isolate cwtchIsolate;
   ReceivePort _receivePort = ReceivePort();
 
-  CwtchFfi(CwtchNotifier _cwtchNotifier) {
+  static String getLibraryPath() {
     if (Platform.isWindows) {
-      library = DynamicLibrary.open("libCwtch.dll");
+      return "libCwtch.dll";
     } else if (Platform.isLinux) {
-      library = DynamicLibrary.open("libCwtch.so");
+      return "libCwtch.so";
     } else if (Platform.isMacOS) {
       print(dirname(Platform.script.path));
-      library = DynamicLibrary.open("libCwtch.dylib");
+      return "libCwtch.dylib";
     } else {
+      return UNSUPPORTED_OS;
+    }
+  }
+
+  CwtchFfi(CwtchNotifier _cwtchNotifier) {
+    String library_path = getLibraryPath();
+    if (library_path == UNSUPPORTED_OS) {
       print("OS ${Platform.operatingSystem} not supported by cwtch/ffi");
       // emergency, ideally the app stays on splash and just posts the error till user closes
       exit(0);
     }
+    library = DynamicLibrary.open(library_path);
     cwtchNotifier = _cwtchNotifier;
   }
 
@@ -150,12 +160,7 @@ class CwtchFfi implements Cwtch {
 
   // Steam of appbus events. Call blocks in libcwtch-go GetAppbusEvent.  Static so the isolate can use it
   static Stream<String> pollAppbusEvents() async* {
-    late DynamicLibrary library;
+    late DynamicLibrary library = DynamicLibrary.open(getLibraryPath());
-    if (Platform.isWindows) {
-      library = DynamicLibrary.open("libCwtch.dll");
-    } else if (Platform.isLinux) {
-      library = DynamicLibrary.open("libCwtch.so");
-    }
 
     var getAppbusEventC = library.lookup<NativeFunction<appbus_events_function>>("c_GetAppBusEvent");
     // ignore: non_constant_identifier_names

macos/Runner/DebugProfile.entitlements

@@ -3,12 +3,12 @@
 <plist version="1.0">
 <dict>
 	<key>com.apple.security.app-sandbox</key>
-	<true/>
+	<false/>
 	<key>com.apple.security.cs.allow-jit</key>
 	<true/>
 	<key>com.apple.security.network.server</key>
 	<true/>
 	<key>com.apple.security.network.client</key>
-    <true/>
+	<true/>
 </dict>
 </plist>

macos/Runner/Release.entitlements

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>com.apple.security.app-sandbox</key>
-	<true/>
+	<false/>
 	<key>com.apple.security.network.client</key>
 	<true/>
 </dict>