move sso code so it won't fail tests if sso dependencies are missing

src/c3nav/control/sso/__init__.py

@@ -1,13 +1,9 @@
-from django.conf import settings
-from social_core.utils import SETTING_PREFIX as SOCIAL_AUTH_SETTING_PREFIX
-from social_core.backends.utils import load_backends
-from social_django.strategy import DjangoStrategy
-
 _sso_services = None
 
 
 def get_sso_services() -> dict[str, str]:
     global _sso_services
+    from social_core.backends.utils import load_backends
     from social_django.utils import load_strategy
 
     if _sso_services is None:
@@ -18,17 +14,3 @@ def get_sso_services() -> dict[str, str]:
     return _sso_services
 
 
-class C3navStrategy(DjangoStrategy):
-    """A subclass of DjangoStrategy that uses our config parser in addition to django settings"""
-    _list_keys = {'authentication_backends', 'pipeline'}
-
-    def get_setting(self, name: str):
-        config_name = name.removeprefix(SOCIAL_AUTH_SETTING_PREFIX + '_').lower()
-        value = settings.C3NAV_CONFIG.get('sso', config_name,
-                                          fallback=None)
-        if value is not None:
-            if config_name in self._list_keys:
-                value = tuple(item.strip() for item in value.split(','))
-        else:
-            value = super().get_setting(name)
-        return value

src/c3nav/control/sso/strategy.py

@@ -0,0 +1,20 @@
+from social_core.utils import SETTING_PREFIX as SOCIAL_AUTH_SETTING_PREFIX
+from social_django.strategy import DjangoStrategy
+
+from django.conf import settings
+
+
+class C3navStrategy(DjangoStrategy):
+    """A subclass of DjangoStrategy that uses our config parser in addition to django settings"""
+    _list_keys = {'authentication_backends', 'pipeline'}
+
+    def get_setting(self, name: str):
+        config_name = name.removeprefix(SOCIAL_AUTH_SETTING_PREFIX + '_').lower()
+        value = settings.C3NAV_CONFIG.get('sso', config_name,
+                                          fallback=None)
+        if value is not None:
+            if config_name in self._list_keys:
+                value = tuple(item.strip() for item in value.split(','))
+        else:
+            value = super().get_setting(name)
+        return value