fix(backend): implemented jwt token invalidation so users cannot use it after expiry

7project/backend/app/app.py

@@ -16,6 +16,8 @@ from app.api.csas import router as csas_router
 from app.api.categories import router as categories_router
 from app.api.transactions import router as transactions_router
 from app.services.user_service import auth_backend, current_active_verified_user, fastapi_users, get_oauth_provider, UserManager, get_jwt_strategy
+from app.core.security import extract_bearer_token, is_token_revoked, decode_and_verify_jwt
+from app.services.user_service import SECRET
 
 
 from fastapi import FastAPI
@@ -49,6 +51,24 @@ fastApi.include_router(categories_router)
 fastApi.include_router(transactions_router)
 
 logging.basicConfig(filename='app.log', level=logging.INFO, format='%(asctime)s %(message)s')
+@fastApi.middleware("http")
+async def auth_guard(request: Request, call_next):
+    # Enforce revoked/expired JWTs are rejected globally
+    token = extract_bearer_token(request)
+    if token:
+        # Deny if token is revoked
+        if is_token_revoked(token):
+            from fastapi import Response, status as _status
+            return Response(status_code=_status.HTTP_401_UNAUTHORIZED)
+        # Deny if token is expired or invalid
+        try:
+            decode_and_verify_jwt(token, SECRET)
+        except Exception:
+            from fastapi import Response, status as _status
+            return Response(status_code=_status.HTTP_401_UNAUTHORIZED)
+    return await call_next(request)
+
+
 @fastApi.middleware("http")
 async def log_traffic(request: Request, call_next):
     start_time = datetime.now()