Allow login using email

- customizes our auth backend to accept email in addition to username
- fixes #383

accounts/auth.py

@@ -27,10 +27,10 @@ from django.dispatch.dispatcher import receiver
 from django.contrib.auth.backends import ModelBackend
 
 
-class AnonymousUserBackend(ModelBackend):
+class WeblateUserBackend(ModelBackend):
     '''
     Authentication backend which allows to control anonymous user
-    permissions.
+    permissions and to login using email.
     '''
 
     def get_all_permissions(self, user_obj, obj=None):
@@ -44,19 +44,27 @@ class AnonymousUserBackend(ModelBackend):
                 anon_user = User.objects.get(username=ANONYMOUS_USER_NAME)
                 user_obj._perm_cache = self.get_all_permissions(anon_user)
             return user_obj._perm_cache
-        return super(AnonymousUserBackend, self).get_all_permissions(
+        return super(WeblateUserBackend, self).get_all_permissions(
             user_obj, obj
         )
 
     def authenticate(self, username=None, password=None, **kwargs):
         '''
-        Prohibits login for anonymous user.
+        Prohibits login for anonymous user and allows to login by email.
         '''
         if username == ANONYMOUS_USER_NAME:
             return False
-        return super(AnonymousUserBackend, self).authenticate(
-            username, password, **kwargs
-        )
+
+        if '@' in username:
+            kwargs = {'email': username}
+        else:
+            kwargs = {'username': username}
+        try:
+            user = User.objects.get(**kwargs)
+            if user.check_password(password):
+                return user
+        except User.DoesNotExist:
+            return None
 
     def has_perm(self, user_obj, perm, obj=None):
         '''

accounts/forms.py

@@ -20,6 +20,7 @@
 
 from django import forms
 from django.utils.translation import ugettext_lazy as _, get_language
+from django.contrib.auth.forms import AuthenticationForm
 
 from accounts.models import Profile, VerifiedEmail
 from lang.models import Language
@@ -387,3 +388,12 @@ class ResetForm(EmailForm):
                 _('User with this email address was not found.')
             )
         return users[0]
+
+
+class LoginForm(AuthenticationForm):
+    def __init__(self, *args, **kwargs):
+
+        super(LoginForm, self).__init__(*args, **kwargs)
+
+        self.fields['username'].label = _('Username or email')
+        self.fields['password'].label = _('Password')

accounts/views.py

@@ -32,7 +32,8 @@ from django.views.generic import TemplateView
 from urllib import urlencode
 
 from accounts.forms import (
-    RegistrationForm, PasswordForm, PasswordChangeForm, EmailForm, ResetForm
+    RegistrationForm, PasswordForm, PasswordChangeForm, EmailForm, ResetForm,
+    LoginForm
 )
 from social.backends.utils import load_backends
 from social.apps.django_app.utils import BACKENDS
@@ -257,6 +258,7 @@ def weblate_login(request):
     return login(
         request,
         template_name='accounts/login.html',
+        authentication_form=LoginForm,
         extra_context={
             'login_backends': [
                 x for x in load_backends(BACKENDS).keys() if x != 'email'

docs/admin/auth.rst

@@ -54,7 +54,7 @@ For example, enabling authentication against GitHub:
     AUTHENTICATION_BACKENDS = (
         'social.backends.github.GithubOAuth2',
         'social.backends.email.EmailAuth',
-        'accounts.auth.AnonymousUserBackend',
+        'accounts.auth.WeblateUserBackend',
     )
 
     # Social auth backends setup

weblate/settings_example.py

@@ -171,7 +171,7 @@ AUTHENTICATION_BACKENDS = (
     'social.backends.email.EmailAuth',
     #'social.backends.github.GithubOAuth2',
     #'social.backends.suse.OpenSUSEOpenId',
-    'accounts.auth.AnonymousUserBackend',
+    'accounts.auth.WeblateUserBackend',
 )
 
 # Social auth backends setup