[FIX] *: avoid muting res.users().context_get return

Some code modify return of res.users().context_get, but this is a
cached method so this will unexpectedly affects totally unrelated code.

For example, changing the company with the company switcher could add
`allowed_company_ids` inside the cache, then it will be cached until the
server is restarted, even if we change company again inbetween.

Added test failed with:

"NotImplementedError: '__setitem__' not supported on frozendict"

on the line with `User = User.with_context(context)` where User already
contained `allowed_company_ids` in its context.

note:

in this forward-port, context_get is also changed to return frozendict
and prevent being able to have an unexpected issue by code that modify
context_get returns.

opw-2158340
closes #42465

closes odoo/odoo#42723

X-original-commit: 5d69885c1cd6921b3de00aae7e0ed6fff243ff95
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

odoo/addons/base/models/res_users.py

@@ -21,7 +21,7 @@ from odoo.exceptions import AccessDenied, AccessError, UserError, ValidationErro
 from odoo.http import request
 from odoo.osv import expression
 from odoo.service.db import check_super
-from odoo.tools import partition, collections, lazy_property
+from odoo.tools import partition, collections, frozendict, lazy_property
 
 _logger = logging.getLogger(__name__)
 
@@ -577,10 +577,10 @@ class Users(models.Model):
         # use read() to not read other fields: this must work while modifying
         # the schema of models res.users or res.partner
         values = user.read(list(name_to_key), load=False)[0]
-        return {
+        return frozendict({
             key: values[name]
             for name, key in name_to_key.items()
-        }
+        })
 
     @api.model
     def action_get(self):

odoo/addons/test_new_api/tests/test_company_checks.py

@@ -2,6 +2,7 @@
 
 from odoo.exceptions import UserError, AccessError
 from odoo.tests import common
+from odoo.tools import frozendict
 
 
 class TestCompanyCheck(common.TransactionCase):
@@ -192,3 +193,26 @@ class TestCompanyCheck(common.TransactionCase):
             with self.assertRaises(AccessError):
                 form.address_id.name
             form.save()
+
+    def test_company_sticky_with_context(self):
+        context = frozendict({'nothing_to_see_here': True})
+        companies_1 = frozendict({'allowed_company_ids': [1]})
+        companies_2 = frozendict({'allowed_company_ids': [2]})
+
+        User = self.env['res.users'].with_context(context)
+        self.assertEqual(User.env.context, context)
+
+        User = User.with_context(**companies_1)
+        self.assertEqual(User.env.context, dict(context, **companies_1))
+
+        # 'allowed_company_ids' is replaced if present in keys
+        User = User.with_context(**companies_2)
+        self.assertEqual(User.env.context, dict(context, **companies_2))
+
+        # 'allowed_company_ids' is replaced if present in new context
+        User = User.with_context(companies_1)
+        self.assertEqual(User.env.context, companies_1)
+
+        # 'allowed_company_ids' is sticky
+        User = User.with_context(context)
+        self.assertEqual(User.env.context, dict(context, **companies_1))

odoo/http.py

@@ -1062,7 +1062,7 @@ class OpenERPSession(werkzeug.contrib.sessions.Session):
         :returns: the new context
         """
         assert self.uid, "The user needs to be logged-in to initialize his context"
-        self.context = request.env['res.users'].context_get() or {}
+        self.context = dict(request.env['res.users'].context_get() or {})
         self.context['uid'] = self.uid
         self._fix_lang(self.context)
         return self.context

odoo/tests/common.py

@@ -1133,7 +1133,7 @@ class HttpCase(TransactionCase):
         session.uid = uid
         session.login = user
         session.session_token = uid and security.compute_session_token(session, env)
-        session.context = env['res.users'].context_get() or {}
+        session.context = dict(env['res.users'].context_get() or {})
         session.context['uid'] = uid
         session._fix_lang(session.context)