typing: Access LANGUAGE_CODE via `django.utils.translation.get_language`.

We no longer need to access the internal `LANGUAGE_CODE` attribute by
using `django.utils.translation.get_language`.

A test case overriding the translation is added to ensure the password
reset form sending to users requested from a wrong domain is properly
translated.

This is a part of django-stubs refactorings.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

zerver/forms.py

@@ -13,6 +13,7 @@ from django.core.validators import validate_email
 from django.http import HttpRequest
 from django.urls import reverse
 from django.utils.http import urlsafe_base64_encode
+from django.utils.translation import get_language
 from django.utils.translation import gettext as _
 from django.utils.translation import gettext_lazy
 from markupsafe import Markup as mark_safe
@@ -382,7 +383,8 @@ class ZulipPasswordResetForm(PasswordResetForm):
             )
             if active_accounts_in_other_realms:
                 context["active_accounts_in_other_realms"] = active_accounts_in_other_realms
-            language = request.LANGUAGE_CODE
+            language = get_language()
+
             send_email(
                 "zerver/emails/password_reset",
                 to_emails=[email],

zerver/tests/test_signup.py

@@ -14,7 +14,9 @@ from django.core.exceptions import ValidationError
 from django.http import HttpRequest, HttpResponse
 from django.test import Client, override_settings
 from django.urls import reverse
+from django.utils import translation
 from django.utils.timezone import now as timezone_now
+from django.utils.translation import gettext as _
 
 from confirmation import settings as confirmation_settings
 from confirmation.models import (
@@ -378,9 +380,10 @@ class PasswordResetTest(ZulipTestCase):
 
         [message] = outbox
         self.assertEqual(self.email_envelope_from(message), settings.NOREPLY_EMAIL_ADDRESS)
+        # The email might be sent in different languages for i18n testing
         self.assertRegex(
             self.email_display_from(message),
-            rf"^Zulip Account Security <{self.TOKENIZED_NOREPLY_REGEX}>\Z",
+            rf'^{_("Zulip Account Security")} <{self.TOKENIZED_NOREPLY_REGEX}>\Z',
         )
         self.assertIn(f"{subdomain}.testserver", message.extra_headers["List-Id"])
 
@@ -659,6 +662,23 @@ class PasswordResetTest(ZulipTestCase):
         self.assertNotIn("reset your password", body)
         self.assertNotIn("deactivated", body)
 
+    def test_wrong_subdomain_i18n(self) -> None:
+        user_profile = self.example_user("hamlet")
+        email = user_profile.delivery_email
+
+        # Send a password reset request with a different language to a wrong subdomain
+        result = self.client_post(
+            "/accounts/password/reset/",
+            {"email": email},
+            HTTP_ACCEPT_LANGUAGE="de",
+            subdomain="lear",
+        )
+        self.assertEqual(result.status_code, 302)
+
+        with translation.override("de"):
+            body = self.get_reset_mail_body("lear")
+            self.assertIn("hat ein neues Passwort", body)
+
     def test_invalid_subdomain(self) -> None:
         email = self.example_email("hamlet")
 

zerver/views/registration.py

@@ -12,6 +12,7 @@ from django.db.models import Q
 from django.http import HttpRequest, HttpResponse, HttpResponseRedirect
 from django.shortcuts import redirect, render
 from django.urls import reverse
+from django.utils.translation import get_language
 from django.utils.translation import gettext as _
 from django_auth_ldap.backend import LDAPBackend, _LDAPUser
 
@@ -581,7 +582,7 @@ def send_confirm_registration_email(
         "zerver/emails/confirm_registration",
         to_emails=[email],
         from_address=FromAddress.tokenized_no_reply_address(),
-        language=request.LANGUAGE_CODE if request is not None else None,
+        language=get_language() if request is not None else None,
         context={
             "create_realm": (realm is None),
             "activate_url": activation_url,