fix middleware

src/middleware.py

@@ -193,27 +193,35 @@ class RequestValidationMiddleware(BaseHTTPMiddleware):
             )
 
         # -------------------------
-        # 4. Single source enforcement
+        # 4. JSON body inspection & Single source enforcement
         #    Ensuring data comes from ONLY one source (Query OR Body).
         # -------------------------
         content_type = request.headers.get("content-type", "")
-        has_json_body = content_type.startswith("application/json")
+        has_json_header = content_type.startswith("application/json")
         
+        # Read body now so we can check if it's actually empty
+        body = b""
+        if has_json_header:
+            body = await request.body()
+        
+        # We consider it a "JSON body" source ONLY if it's not empty and not just "{}"
+        has_actual_json_body = has_json_header and body and body.strip() != b"{}"
+
         # Check for data parameters in query (anything whitelisted as 'data' but not 'session/auth')
         data_params_in_query = [
             key for key, _ in params
             if key in ALLOWED_QUERY_PARAMS and key not in WRITE_METHOD_ALLOWED_PARAMS
         ]
 
-        if has_json_body:
-            # If sending JSON body, we forbid any data in query string (one source only)
+        if has_actual_json_body:
+            # If sending actual JSON body, we forbid any data in query string (one source only)
             if data_params_in_query:
                 raise HTTPException(
                     status_code=422,
                     detail=f"Single source enforcement: Data received from both JSON body and query string ({data_params_in_query}). Use only one source.",
                 )
             
-            # Special case: GET with body is discouraged/forbidden in many strict security contexts
+            # Special case: GET with actual body is discouraged/forbidden
             if request.method == "GET":
                 raise HTTPException(
                     status_code=422,
@@ -265,17 +273,9 @@ class RequestValidationMiddleware(BaseHTTPMiddleware):
             )
 
         # -------------------------
-        # 7. JSON body inspection
+        # 7. JSON body inspection & Re-injection
         # -------------------------
-        if content_type.startswith("application/json"):
-            body = await request.body()
-
-            #if len(body) > MAX_JSON_BODY_SIZE:
-            #    raise HTTPException(
-            #        status_code=413,
-            #        detail="JSON body too large",
-            #    )
-
+        if has_json_header:
             if body:
                 try:
                     payload = json.loads(body)
@@ -284,13 +284,11 @@ class RequestValidationMiddleware(BaseHTTPMiddleware):
                         status_code=422,
                         detail="Invalid JSON body",
                     )
-
                 inspect_json(payload)
 
             # Re-inject body for downstream handlers
             async def receive():
                 return {"type": "http.request", "body": body}
-
             request._receive = receive  # noqa: protected-access
 
         return await call_next(request)