sessions: addition of KVSession interface

Signed-off-by: Harris Tzovanakis <[email protected]>

invenio_accounts/config.py

@@ -223,3 +223,7 @@
 
 ACCOUNTS_USERINFO_HEADERS = False
 """If True, add X-Session-ID and X-User-ID to the HTTP response."""
+
+SESSION_INTERFACE_FACTORY = \
+    'invenio_accounts.sessions:KVSessionInterfaceWithAnonymousSessions'
+"""Set the session interface factory for KVSession"""

invenio_accounts/sessions.py

@@ -17,6 +17,8 @@
 from __future__ import absolute_import, print_function
 
 from flask import after_this_request, current_app, request, session
+from flask_kvsession import KVSessionInterface
+from flask_login import current_user
 from geolite2 import geolite2
 from invenio_db import db
 from ua_parser import user_agent_parser
@@ -135,3 +137,20 @@ def delete_user_sessions(user):
         SessionActivity.query.filter_by(user=user).delete()
 
     return True
+
+
+class KVSessionInterfaceWithAnonymousSessions(KVSessionInterface):
+    """Session interface to avoid storing anonymous sessions."""
+
+    def save_session(self, app, session, response):
+        """Save session interface."""
+        anonymous_session = not current_user.is_authenticated
+        super(
+            KVSessionInterfaceWithAnonymousSessions,
+            self
+        ).save_session(
+            app,
+            session,
+            response,
+            anonymous_session=anonymous_session
+        )