[IMP] session_redis: add absolute expiration option

ODOO_SESSION_REDIS_EXPIRATION_ABSOLUTE=1 makes authenticated sessions expire
ODOO_SESSION_REDIS_EXPIRATION seconds after the login, whatever the activity.

requirements.txt

@@ -3,4 +3,4 @@ azure-identity
 azure-storage-blob
 prometheus_client
 python-json-logger
-redis
+redis>=3.5

session_redis/README.rst

@@ -20,6 +20,10 @@ The storage of sessions in Redis is activated using environment variables.
   the sessions (default is 7 days)
 * ``ODOO_SESSION_REDIS_EXPIRATION_ANONYMOUS`` is the time in seconds before expiration of
   the anonymous sessions (default is 3 hours)
+* ``ODOO_SESSION_REDIS_EXPIRATION_ABSOLUTE``, when ``1`` or ``true``, the
+  authenticated sessions expire ``ODOO_SESSION_REDIS_EXPIRATION`` seconds
+  after the login, whatever the activity, instead of after the last request
+  (requires Redis >= 6.0 and redis-py >= 3.5)
 
 
 The keys are set to ``session:<session id>``.

session_redis/__manifest__.py

@@ -5,7 +5,7 @@
 {
     "name": "Sessions in Redis",
     "summary": "Store web sessions in Redis",
-    "version": "17.0.1.0.0",
+    "version": "17.0.1.1.0",
     "author": "Camptocamp,Odoo Community Association (OCA)",
     "license": "AGPL-3",
     "category": "Extra Tools",
@@ -15,7 +15,7 @@
         "auth_session_timeout",
     ],
     "external_dependencies": {
-        "python": ["redis"],
+        "python": ["redis>=3.5"],
     },
     "website": "https://github.com/camptocamp/odoo-cloud-platform",
     "data": [],

session_redis/http.py

@@ -40,6 +40,7 @@ url = os.environ.get("ODOO_SESSION_REDIS_URL")
 password = os.environ.get("ODOO_SESSION_REDIS_PASSWORD")
 expiration = os.environ.get("ODOO_SESSION_REDIS_EXPIRATION")
 anon_expiration = os.environ.get("ODOO_SESSION_REDIS_EXPIRATION_ANONYMOUS")
+absolute_expiration = is_true(os.environ.get("ODOO_SESSION_REDIS_EXPIRATION_ABSOLUTE"))
 
 
 @lazy_property
@@ -56,6 +57,7 @@ def session_store(self):
         prefix=prefix,
         expiration=expiration,
         anon_expiration=anon_expiration,
+        absolute_expiration=absolute_expiration,
         session_class=http.Session,
     )
 

session_redis/session.py

@@ -27,6 +27,7 @@ class RedisSessionStore(SessionStore):
         prefix="",
         expiration=None,
         anon_expiration=None,
+        absolute_expiration=False,
     ):
         super().__init__(session_class=session_class)
         self.redis = redis
@@ -38,6 +39,8 @@ class RedisSessionStore(SessionStore):
             self.anon_expiration = DEFAULT_SESSION_TIMEOUT_ANONYMOUS
         else:
             self.anon_expiration = anon_expiration
+        # authenticated sessions expire after `expiration` since their login
+        self.absolute_expiration = absolute_expiration
         self.prefix = "session:"
         if prefix:
             self.prefix = f"{self.prefix}:{prefix}:"
@@ -69,8 +72,19 @@ class RedisSessionStore(SessionStore):
         data = json.dumps(dict(session), cls=json_encoding.SessionEncoder).encode(
             "utf-8"
         )
-        if self.redis.set(key, data):
-            return self.redis.expire(key, expiration)
+        if self.absolute_expiration and session.uid and not session.is_new:
+            # absolute mode: keep the TTL set at login (keepttl) and never
+            # recreate an expired session (xx); anonymous and new sessions
+            # get a full TTL below
+            if not self.redis.set(key, data, xx=True, keepttl=True):
+                return False
+            # keepttl keeps "no TTL": give one to a key left without
+            if self.redis.ttl(key) == -1:
+                self.redis.expire(key, expiration)
+            return True
+        # write the data and the TTL in one command: with SET then EXPIRE, a
+        # failed EXPIRE left a key without TTL, never expiring
+        return self.redis.set(key, data, ex=expiration)
 
     def delete(self, session):
         key = self.build_key(session.sid)
@@ -113,8 +127,11 @@ class RedisSessionStore(SessionStore):
     def rotate(self, session, env):
         self.delete(session)
         session.sid = self.generate_key()
+        # new key: save it with a full expiration, in absolute mode too
+        session.is_new = True
         if session.uid and env:
             session.session_token = security.compute_session_token(session, env)
+        session.should_rotate = False
         self.save(session)
 
     def vacuum(self, *args, **kwargs):

session_redis/tests/__init__.py

@@ -0,0 +1 @@
+from . import test_session_store

session_redis/tests/test_session_store.py

@@ -0,0 +1,157 @@
+# Copyright 2026 Camptocamp SA
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html)
+
+from odoo import http
+from odoo.tests import BaseCase
+
+from ..session import RedisSessionStore
+
+DAY = 60 * 60 * 24
+HOUR = 60 * 60
+
+
+class FakeRedis:
+    """In-memory Redis with a manual clock, for the commands used by the store"""
+
+    def __init__(self):
+        self.now = 0
+        self.data = {}
+        self.expire_at = {}
+
+    def advance(self, seconds):
+        self.now += seconds
+
+    def _purge(self, key):
+        expire_at = self.expire_at.get(key)
+        if expire_at is not None and expire_at <= self.now:
+            self.data.pop(key, None)
+            self.expire_at.pop(key, None)
+
+    def set(self, key, value, ex=None, xx=False, keepttl=False):
+        self._purge(key)
+        if xx and key not in self.data:
+            return None
+        self.data[key] = value
+        if ex is not None:
+            self.expire_at[key] = self.now + int(ex)
+        elif not keepttl:
+            self.expire_at.pop(key, None)
+        return True
+
+    def get(self, key):
+        self._purge(key)
+        return self.data.get(key)
+
+    def delete(self, key):
+        self.expire_at.pop(key, None)
+        return int(self.data.pop(key, None) is not None)
+
+    def expire(self, key, seconds):
+        self._purge(key)
+        if key not in self.data:
+            return False
+        self.expire_at[key] = self.now + int(seconds)
+        return True
+
+    def ttl(self, key):
+        self._purge(key)
+        if key not in self.data:
+            return -2
+        if key not in self.expire_at:
+            return -1
+        return self.expire_at[key] - self.now
+
+
+class TestRedisSessionStore(BaseCase):
+    def _get_store(self, **kwargs):
+        self.redis = FakeRedis()
+        return RedisSessionStore(
+            redis=self.redis,
+            session_class=http.Session,
+            expiration=7 * DAY,
+            anon_expiration=3 * HOUR,
+            **kwargs,
+        )
+
+    def _login(self, store):
+        session = store.new()
+        session.update({"uid": 1, "login": "admin"})
+        store.save(session)
+        return session
+
+    def _ttl(self, store, session):
+        return self.redis.ttl(store.build_key(session.sid))
+
+    def _use(self, store, session):
+        """Simulate a request of the user, which touches the session"""
+        session = store.get(session.sid)
+        session["context"] = {"lang": "en_US"}
+        store.save(session)
+        return session
+
+    def test_sliding_expiration(self):
+        """By default, each save renews the expiration of the session"""
+        store = self._get_store()
+        session = self._login(store)
+        self.assertEqual(self._ttl(store, session), 7 * DAY)
+        for __ in range(10):
+            self.redis.advance(DAY)
+            session = self._use(store, session)
+            self.assertEqual(self._ttl(store, session), 7 * DAY)
+        # still logged in after 10 days of daily use
+        self.assertEqual(store.get(session.sid).uid, 1)
+
+    def test_absolute_expiration(self):
+        """The session expires 7 days after the login, whatever the use"""
+        store = self._get_store(absolute_expiration=True)
+        session = self._login(store)
+        sid = session.sid
+        for day in range(1, 7):
+            self.redis.advance(DAY)
+            session = self._use(store, session)
+            self.assertEqual(session.uid, 1)
+            self.assertEqual(self._ttl(store, session), (7 - day) * DAY)
+        self.assertEqual(store.get(sid)["context"], {"lang": "en_US"})
+        self.redis.advance(DAY)
+        self.assertFalse(store.get(sid).uid)
+
+    def test_absolute_expiration_not_recreated(self):
+        """A request ending after the expiration does not revive the session"""
+        store = self._get_store(absolute_expiration=True)
+        session = self._login(store)
+        session = store.get(session.sid)
+        self.redis.advance(7 * DAY)
+        session["context"] = {"lang": "en_US"}
+        store.save(session)
+        self.assertEqual(self._ttl(store, session), -2)
+
+    def test_absolute_expiration_rotation(self):
+        """A rotated session (login, logout, MFA) gets a full expiration"""
+        store = self._get_store(absolute_expiration=True)
+        session = self._login(store)
+        old_sid = session.sid
+        self.redis.advance(3 * DAY)
+        store.rotate(session, None)
+        self.assertNotEqual(session.sid, old_sid)
+        self.assertIsNone(self.redis.get(store.build_key(old_sid)))
+        self.assertEqual(self._ttl(store, session), 7 * DAY)
+
+    def test_absolute_expiration_anonymous(self):
+        """Anonymous sessions keep a sliding expiration"""
+        store = self._get_store(absolute_expiration=True)
+        session = store.new()
+        session["debug"] = ""
+        store.save(session)
+        self.assertEqual(self._ttl(store, session), 3 * HOUR)
+        self.redis.advance(2 * HOUR)
+        session = self._use(store, session)
+        self.assertEqual(self._ttl(store, session), 3 * HOUR)
+
+    def test_absolute_expiration_key_without_ttl(self):
+        """A key without TTL (left by the former SET then EXPIRE) gets one"""
+        store = self._get_store(absolute_expiration=True)
+        session = self._login(store)
+        self.redis.expire_at.pop(store.build_key(session.sid))
+        self.assertEqual(self._ttl(store, session), -1)
+        session = self._use(store, session)
+        self.assertEqual(self._ttl(store, session), 7 * DAY)