From 28db8ae42782218cb357dc4095ea40732791a061 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Kucharczyk?= <lukas@kucharczyk.xyz>
Date: Thu, 30 May 2024 11:15:52 +0200
Subject: [PATCH] Make sure attribute chains are evaluated safely

---
 common/utils.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/common/utils.py b/common/utils.py
index 422a018..f837ec0 100644
--- a/common/utils.py
+++ b/common/utils.py
@@ -7,3 +7,23 @@ def safe_division(numerator: int | float, denominator: int | float) -> int | flo
         return numerator / denominator
     except ZeroDivisionError:
         return 0
+    
+def safe_getattr(obj, attr_chain, default=None):
+    """
+    Safely get the nested attribute from an object.
+
+    Parameters:
+    obj (object): The object from which to retrieve the attribute.
+    attr_chain (str): The chain of attributes, separated by dots.
+    default: The default value to return if any attribute in the chain does not exist.
+
+    Returns:
+    The value of the nested attribute if it exists, otherwise the default value.
+    """
+    attrs = attr_chain.split('.')
+    for attr in attrs:
+        try:
+            obj = getattr(obj, attr)
+        except AttributeError:
+            return default
+    return obj