BOM-1514 : Remove waffle switch PREVENT_AUTH_USER_WRITES (#23686)

* Remove waffle switch PREVENT_AUTH_USER_WRITES

common/djangoapps/student/apps.py

@@ -17,10 +17,6 @@ class StudentConfig(AppConfig):
     name = 'student'
 
     def ready(self):
-        from django.contrib.auth.models import update_last_login as django_update_last_login
-        user_logged_in.disconnect(django_update_last_login)
-        from .signals.receivers import update_last_login
-        user_logged_in.connect(update_last_login)
 
         from django.contrib.auth.models import User
         from .signals.receivers import on_user_updated

common/djangoapps/student/signals/receivers.py

@@ -4,24 +4,11 @@ Signal receivers for the "student" application.
 
 
 from django.conf import settings
-from django.utils import timezone
 
-from openedx.core.djangoapps.user_api.config.waffle import PREVENT_AUTH_USER_WRITES, waffle
 from student.helpers import USERNAME_EXISTS_MSG_FMT, AccountValidationError
 from student.models import is_email_retired, is_username_retired
 
 
-def update_last_login(sender, user, **kwargs):  # pylint: disable=unused-argument
-    """
-    Replacement for Django's ``user_logged_in`` signal handler that knows not
-    to attempt updating the ``last_login`` field when we're trying to avoid
-    writes to the ``auth_user`` table while running a migration.
-    """
-    if not waffle().is_enabled(PREVENT_AUTH_USER_WRITES):
-        user.last_login = timezone.now()
-        user.save(update_fields=['last_login'])
-
-
 def on_user_updated(sender, instance, **kwargs):  # pylint: disable=unused-argument
     """
     Check for retired usernames.

common/djangoapps/student/tests/test_activate_account.py

@@ -11,7 +11,6 @@ from django.urls import reverse
 from mock import patch
 
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
-from openedx.core.djangoapps.user_api.config.waffle import PREVENT_AUTH_USER_WRITES, SYSTEM_MAINTENANCE_MSG, waffle
 from student.models import Registration
 from student.tests.factories import UserFactory
 
@@ -136,14 +135,3 @@ class TestActivateAccount(TestCase):
         response = self.client.get(reverse('activate', args=[uuid4().hex]), follow=True)
         self.assertRedirects(response, login_page_url)
         self.assertContains(response, 'Your account could not be activated')
-
-    def test_account_activation_prevent_auth_user_writes(self):
-        login_page_url = "{login_url}?next={redirect_url}".format(
-            login_url=reverse('signin_user'),
-            redirect_url=reverse('dashboard'),
-        )
-        with waffle().override(PREVENT_AUTH_USER_WRITES, True):
-            response = self.client.get(reverse('activate', args=[self.registration.activation_key]), follow=True)
-            self.assertRedirects(response, login_page_url)
-            self.assertContains(response, SYSTEM_MAINTENANCE_MSG)
-            self._assert_user_active_state(expected_active_state=False)

common/djangoapps/student/tests/test_email.py

@@ -21,7 +21,6 @@ from edxmako.shortcuts import marketing_link, render_to_string
 from openedx.core.djangoapps.ace_common.tests.mixins import EmailTemplateTagMixin
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.djangoapps.theming.tests.test_util import with_comprehensive_theme
-from openedx.core.djangoapps.user_api.config.waffle import PREVENT_AUTH_USER_WRITES, SYSTEM_MAINTENANCE_MSG, waffle
 from openedx.core.djangolib.testing.utils import CacheIsolationMixin, CacheIsolationTestCase
 from openedx.core.lib.request_utils import safe_get_host
 from student.models import PendingEmailChange, Registration, UserProfile
@@ -513,14 +512,6 @@ class EmailChangeConfirmationTests(EmailTestMixin, EmailTemplateTagMixin, CacheI
         )
         self.assertEqual(0, PendingEmailChange.objects.count())
 
-    @unittest.skipUnless(settings.ROOT_URLCONF == 'lms.urls', "Test only valid in LMS")
-    def test_prevent_auth_user_writes(self):
-        with waffle().override(PREVENT_AUTH_USER_WRITES, True):
-            self.check_confirm_email_change('email_change_failed.html', {
-                'err_msg': SYSTEM_MAINTENANCE_MSG
-            })
-            self.assertRolledBack()
-
     @patch('student.views.PendingEmailChange.objects.get', Mock(side_effect=TestException))
     def test_always_rollback(self):
         connection = transaction.get_connection()

common/djangoapps/student/views/management.py

@@ -49,7 +49,6 @@ from openedx.core.djangoapps.lang_pref import LANGUAGE_KEY
 from openedx.core.djangoapps.programs.models import ProgramsApiConfig
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.djangoapps.theming import helpers as theming_helpers
-from openedx.core.djangoapps.user_api.config.waffle import PREVENT_AUTH_USER_WRITES, SYSTEM_MAINTENANCE_MSG, waffle
 from openedx.core.djangoapps.user_api.preferences import api as preferences_api
 from openedx.core.djangolib.markup import HTML, Text
 from student.helpers import DISABLE_UNENROLL_CERT_STATES, cert_info, generate_activation_email_context
@@ -520,16 +519,6 @@ def activate_account(request, key):
                 ),
                 extra_tags='account-activation aa-icon',
             )
-        elif waffle().is_enabled(PREVENT_AUTH_USER_WRITES):
-            messages.error(
-                request,
-                HTML(u'{html_start}{message}{html_end}').format(
-                    message=Text(SYSTEM_MAINTENANCE_MSG),
-                    html_start=HTML('<p class="message-title">'),
-                    html_end=HTML('</p>'),
-                ),
-                extra_tags='account-activation aa-icon',
-            )
         else:
             registration.activate()
             # Success message for logged in users.
@@ -572,9 +561,6 @@ def activate_account_studio(request, key):
         user_logged_in = request.user.is_authenticated
         already_active = True
         if not registration.user.is_active:
-            if waffle().is_enabled(PREVENT_AUTH_USER_WRITES):
-                return render_to_response('registration/activation_invalid.html',
-                                          {'csrf': csrf(request)['csrf_token']})
             registration.activate()
             already_active = False
 
@@ -739,9 +725,6 @@ def confirm_email_change(request, key):  # pylint: disable=unused-argument
     User requested a new e-mail. This is called when the activation
     link is clicked. We confirm with the old e-mail, and update
     """
-    if waffle().is_enabled(PREVENT_AUTH_USER_WRITES):
-        return render_to_response('email_change_failed.html', {'err_msg': SYSTEM_MAINTENANCE_MSG})
-
     with transaction.atomic():
         try:
             pec = PendingEmailChange.objects.get(activation_key=key)