Username case insensitive and username to lowercase (#251)

* [Add] check username case insensitive

* [Fix] Variable bad defined

* [Update] Change error handler

* [Update] Change check in save by clean_username

* [Fix] Return username after clean

* [Add] Clear code

* [Fix] Save username in lowercase

* [Update] transaltions files

* [Update] Username exits query

* [Add] username to lowercase

* [Add] check username case insensitive

* [Fix] Variable bad defined

* [Update] Change error handler

* [Update] Change check in save by clean_username

* [Fix] Return username after clean

* [Add] Clear code

* [Fix] Save username in lowercase

* [Update] transaltions files

* [Update] Username exits query

* [Add] username to lowercase

* [Fix] Indentation

* [Fix] locale checkout from master

* [Fix] Typo error in exception raise

* [Fix] Reorder lower()
[Fix] alphabetize imports

* [Update] change to new registration form with username lowercase
[Add] Test for RegistrationFormUsernameLowercase

* [Add] new form username to lower case to docs

* [Fix] RegistrationFormUniqueEmail in docs

* [Add] documentation in right place

* [Remove] removed docs from docs directory

* [Fix] Indentantion and white spaces

* [Fix] failed attribute in check if username exits

* [Fix] Filter with username customizable field

* [Fix] Removed white space after `{`

registration/forms.py

@@ -11,8 +11,8 @@
 
 
 from django import forms
-from django.utils.translation import ugettext_lazy as _
 from django.contrib.auth.forms import UserCreationForm
+from django.utils.translation import ugettext_lazy as _
 
 from .users import UserModel, UsernameField
 
@@ -40,6 +40,20 @@ class Meta:
         fields = (UsernameField(), "email")
 
 
+class RegistrationFormUsernameLowercase(RegistrationForm):
+    """
+    A subclass of :class:`RegistrationForm` which enforces unique case insensitive
+    usernames, make all usernames to lower case.
+
+    """
+    def clean_username(self):
+        username = self.cleaned_data.get('username', '').lower()
+        if User.objects.filter(**{UsernameField(): username}).exists():
+            raise forms.ValidationError(_('A user with that username already exists.'))
+
+        return username
+
+
 class RegistrationFormTermsOfService(RegistrationForm):
     """
     Subclass of ``RegistrationForm`` which adds a required checkbox

registration/tests/forms.py

@@ -64,6 +64,30 @@ def test_registration_form(self):
                                             'password2': 'foo'})
         self.failUnless(form.is_valid())
 
+    def test_registration_form_username_lowercase(self):
+        """
+        Test that ``RegistrationFormUniqueEmail`` validates uniqueness
+        of email addresses.
+
+        """
+        # Create a user so we can verify that duplicate addresses
+        # aren't permitted.
+        UserModel().objects.create_user('alice', '[email protected]', 'secret')
+
+        form = forms.RegistrationFormUsernameLowercase(data={'username': 'Alice',
+                                                             'email': '[email protected]',
+                                                             'password1': 'foo',
+                                                             'password2': 'foo'})
+        self.failIf(form.is_valid())
+        self.assertEqual(form.errors['username'],
+                         ["A user with that username already exists."])
+
+        form = forms.RegistrationFormUsernameLowercase(data={'username': 'foo',
+                                                             'email': '[email protected]',
+                                                             'password1': 'foo',
+                                                             'password2': 'foo'})
+        self.failUnless(form.is_valid())
+
     def test_registration_form_tos(self):
         """
         Test that ``RegistrationFormTermsOfService`` requires