feat: enhance error reporting for missing user attributes in VisioneCompleteView and add fiscal_number attribute to requested claims

relying_party/relying_party/visione_views.py

@@ -67,8 +67,25 @@ class VisioneCompleteView(View):
         )
         fiscal_code = _normalize_fiscal_code(fiscal_code)
         subject = user_attrs.get("sub") or user_attrs.get("username")
-        if not state or not issuer or not subject or not fiscal_code:
-            return HttpResponseBadRequest("Missing Visione auth session or user attributes")
+        missing = []
+        if not state:
+            missing.append("visione_state")
+        if not issuer:
+            missing.append("visione_provider_issuer")
+        if not subject:
+            missing.append("subject")
+        if not fiscal_code:
+            missing.append("fiscal_code")
+        if missing:
+            logger.warning(
+                "Visione complete missing required data missing=%s session_keys=%s user_attr_keys=%s",
+                ",".join(missing),
+                sorted(request.session.keys()),
+                sorted(user_attrs.keys()) if isinstance(user_attrs, dict) else [],
+            )
+            return HttpResponseBadRequest(
+                f"Missing Visione auth session or user attributes: {', '.join(missing)}"
+            )
 
         payload = {
             "state": state,