progress towards fixing login backend

app/bloonsa_game/migrations/0025_alter_level_title.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.6 on 2025-02-21 03:42
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bloonsa_game', '0024_config'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='level',
+            name='title',
+            field=models.CharField(max_length=64),
+        ),
+    ]

app/settings/settings.py

@@ -123,6 +123,9 @@ AUTH_PASSWORD_VALIDATORS = [
     },
 ]
 
+AUTHENTICATION_BACKENDS = (
+    "users.backends.CaseInsensitiveModelBackend", # inherits from 'django.contrib.auth.backends.ModelBackend'
+)
 
 # Internationalization
 # https://docs.djangoproject.com/en/3.2/topics/i18n/

app/users/backends.py

@@ -0,0 +1,21 @@
+from django.contrib.auth.backends import ModelBackend
+from django.contrib.auth import get_user_model
+
+from users.models import User
+
+class CaseInsensitiveModelBackend(ModelBackend):
+    def authenticate(self, username=None, password=None, **kwargs):
+        UserModel = get_user_model()
+        if username is None:
+            username = kwargs.get(UserModel.USERNAME_FIELD)
+        try:
+            d = {'%s__iexact'%UserModel.USERNAME_FIELD: username}
+            user = UserModel.objects.get(**d)
+            if user.check_password(password):
+                return user
+        except UserModel.DoesNotExist:
+            # Run the default password hasher once to reduce the timing
+            # difference between an existing and a non-existing user (#20760).
+            UserModel().set_password(password)
+
+        return None