Enable login with email, like the form says

server/users/schema/mutations_public.py

@@ -2,7 +2,7 @@ import graphene
 from django.conf import settings
 from django.contrib.auth import authenticate, login
 from graphene import relay
-
+from users.models import User
 # from users.user_signup_login_handler import handle_user_and_verify_products, UNKNOWN_ERROR, EMAIL_NOT_VERIFIED
 
 
@@ -19,6 +19,13 @@ class BetaLogin(relay.ClientIDMutation):
         if settings.ALLOW_BETA_LOGIN:
             password = kwargs.get('password_input')
             username = kwargs.get('username_input')
+
+            # Login with email
+            if '@' in username:
+                user = User.objects.get(email=username)
+                if user:
+                    username = user.username
+
             user = authenticate(username=username, password=password)
             if user is None:
                 raise Exception('invalid_credentials')