fix: prevent exception in attribute mapping

when internal_attributes contain nested attribute but the actual value is not nested

Author: melanger

src/satosa/attribute_mapping.py

@@ -1,6 +1,7 @@
 import logging
 from collections import defaultdict
 from itertools import chain
+from typing import Mapping
 
 from mako.template import Template
 
@@ -97,8 +98,9 @@ def to_internal(self, attribute_profile, external_dict):
                 continue
 
             external_attribute_name = mapping[attribute_profile]
-            attribute_values = self._collate_attribute_values_by_priority_order(external_attribute_name,
-                                                                                external_dict)
+            attribute_values = self._collate_attribute_values_by_priority_order(
+                external_attribute_name, external_dict
+            )
             if attribute_values:  # Only insert key if it has some values
                 logline = "backend attribute {external} mapped to {internal} ({value})".format(
                     external=external_attribute_name, internal=internal_attribute_name, value=attribute_values
@@ -157,6 +159,8 @@ def _get_nested_attribute_value(self, nested_key, data):
 
         d = data
         for key in keys:
+            if not isinstance(d, Mapping):
+                return None
             d = d.get(key)
             if d is None:
                 return None

tests/satosa/test_attribute_mapping.py

@@ -5,6 +5,56 @@
 from satosa.attribute_mapping import AttributeMapper
 
 
+class TestAttributeMapperNestedDataDifferentAttrProfile:
+    def test_nested_mapping_nested_data_to_internal(self):
+        mapping = {
+            "attributes": {
+                "name": {
+                    "openid": ["name"]
+                },
+                "givenname": {
+                    "openid": ["given_name", "name.firstName"]
+                },
+            },
+        }
+
+        data = {
+            "name": {
+                "firstName": "value-first",
+                "lastName": "value-last",
+            },
+            "email": "[email protected]",
+        }
+
+        converter = AttributeMapper(mapping)
+        internal_repr = converter.to_internal("openid", data)
+        assert internal_repr["name"] == [data["name"]]
+        assert internal_repr["givenname"] == [data["name"]["firstName"]]
+
+
+    def test_nested_mapping_simple_data_to_internal(self):
+        mapping = {
+            "attributes": {
+                "name": {
+                    "openid": ["name"]
+                },
+                "givenname": {
+                    "openid": ["given_name", "name.firstName"]
+                },
+            },
+        }
+
+        data = {
+            "name": "value-first",
+            "email": "[email protected]",
+        }
+
+        converter = AttributeMapper(mapping)
+        internal_repr = converter.to_internal("openid", data)
+        assert internal_repr["name"] == [data["name"]]
+        assert internal_repr.get("givenname") is None
+
+
 class TestAttributeMapper:
     def test_nested_attribute_to_internal(self):
         mapping = {