Mostly working websocket stuff, some message weirdness at the moment...

frontend/lib/providers/dio.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:frontend/providers/auth.dart';
 import 'package:logging/logging.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:shared_models/jwt.dart';
 
 part 'dio.g.dart';
 
@@ -17,8 +18,13 @@ Dio dio(Ref ref) {
   ));
 
   final jwt = ref.watch(jwtNotifierProvider).valueOrNull;
+  final jwtBody = ref.read(jwtBodyProvider);
 
-  dio.interceptors.addAll([JwtInterceptor(jwt: jwt), CustomLogInterceptor()]);
+  dio.interceptors.addAll([
+    JwtInterceptor(
+        jwt: jwt, jwtBody: jwtBody, invalidateJwtCallback: () => ref.read(jwtNotifierProvider.notifier).eraseJwt()),
+    CustomLogInterceptor()
+  ]);
 
   logger.fine('Created new Dio object');
 
@@ -28,15 +34,36 @@ Dio dio(Ref ref) {
 // Adds the jwt to
 class JwtInterceptor extends Interceptor {
   final String? jwt;
+  final JWTBody? jwtBody;
+  final Function invalidateJwtCallback;
 
-  JwtInterceptor({required this.jwt});
+  JwtInterceptor({required this.jwt, required this.jwtBody, required this.invalidateJwtCallback});
 
   @override
   void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    if (jwt == null || jwtBody == null) {
+      handler.next(options);
+      return;
+    }
+    if (jwtBody != null && jwtBody!.exp < DateTime.now().millisecondsSinceEpoch ~/ 1000) {
+      invalidateJwtCallback();
+      handler.next(options);
+      return;
+    }
     if (jwt != null) {
       options.headers['Authorization'] = 'Bearer $jwt';
+      handler.next(options);
     }
-    handler.next(options);
+  }
+
+  // on unauthorized request, remove jwt
+  @override
+  // ignore: strict_raw_type
+  void onResponse(Response response, ResponseInterceptorHandler handler) {
+    if (response.statusCode == 401) {
+      invalidateJwtCallback();
+    }
+    handler.next(response);
   }
 }