fix(missing session expiry): fixes cases where session expiry is missing

pr: pallets-eco#57

pallets-eco#56

Author: christopherpickering

flask_session/sessions.py

@@ -583,7 +583,9 @@ def open_session(self, app, request):
         saved_session = self.sql_session_model.query.filter_by(
             session_id=store_id
         ).first()
-        if saved_session and saved_session.expiry <= datetime.utcnow():
+        if saved_session and (
+            not saved_session.expiry or saved_session.expiry <= datetime.utcnow()
+        ):
             # Delete expired session
             self.db.session.delete(saved_session)
             self.db.session.commit()

tox.ini

@@ -39,7 +39,8 @@ skip_install = true
 
 [testenv]
 commands =
-    python -m coverage run -m unittest
-    python -m coverage report
-    python -m coverage xml
+    coverage run -m unittest
+    coverage report
+    coverage xml
+allowlist_externals = coverage
 skip_install = false