refactor(api): move jsonResponse logic to APIInvalidInputException

api/api_errors.py

@@ -1,10 +1,16 @@
 """
 Classes for API errors
 """
+from sefaria.client.util import jsonResponse
 
 
 class APIInvalidInputException(Exception):
     """
     When data in an invalid format is passed to an API
     """
-    pass
+    def __init__(self, message):
+        super().__init__(message)
+        self.message = message
+
+    def to_json_response(self):
+        return jsonResponse({"invalid_input_error": self.message}, status=400)

sefaria/views.py

@@ -343,7 +343,7 @@ def find_refs_api(request):
     try:
         return jsonResponse(make_find_refs_response(request))
     except APIInvalidInputException as e:
-        return jsonResponse({"error": str(e)}, status=400)
+        return e.to_json_response()
 
 
 @api_view(["GET"])