Refs #21379 -- Normalized unicode username inputs

1 files changed, 7 insertions, 1 deletions

diff --git a/django/contrib/auth/base_user.py b/django/contrib/auth/base_user.py
index c8f748cf02..d168262bb0 100644
--- a/django/contrib/auth/base_user.py
+++ b/django/contrib/auth/base_user.py
@@ -4,6 +4,8 @@ not in INSTALLED_APPS.
 """
 from __future__ import unicode_literals
 
+import unicodedata
+
 from django.contrib.auth import password_validation
 from django.contrib.auth.hashers import (
     check_password, is_password_usable, make_password,
@@ -11,7 +13,7 @@ from django.contrib.auth.hashers import (
 from django.db import models
 from django.utils.crypto import get_random_string, salted_hmac
 from django.utils.deprecation import CallableFalse, CallableTrue
-from django.utils.encoding import python_2_unicode_compatible
+from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.translation import ugettext_lazy as _
 
 
@@ -31,6 +33,10 @@ class BaseUserManager(models.Manager):
             email = '@'.join([email_name, domain_part.lower()])
         return email
 
+    @classmethod
+    def normalize_username(cls, username):
+        return unicodedata.normalize('NFKC', force_text(username))
+
     def make_random_password(self, length=10,
                              allowed_chars='abcdefghjkmnpqrstuvwxyz'
                                            'ABCDEFGHJKLMNPQRSTUVWXYZ'