[GREEN] Add lowercasing on username on obtain auth token

apps/custom_auth/views.py

+from rest_framework.authtoken.views import ObtainAuthToken
+from rest_framework.authtoken.models import Token
+from rest_framework.response import Response
+from rest_framework import status
+
+
+class CustomAuthToken(ObtainAuthToken):
+
+    def post(self, request, *args, **kwargs):
+        request_data = request.data
+        request_data["username"] = request_data["username"].lower()
+
+        serializer = self.serializer_class(
+            data=request_data,
+            context={"request": request}
+        )
+        serializer.is_valid(raise_exception=True)
+
+        user = serializer.validated_data["user"]
+        token, _ = Token.objects.get_or_create(user=user)
+
+        return Response(data={ "token": token.key }, status=status.HTTP_200_OK)

project/urls.py

 from django.contrib import admin
 from django.urls import path, include
-from rest_framework.authtoken.views import obtain_auth_token
-
+from apps.custom_auth.views import CustomAuthToken
 
 urlpatterns = [
     path("admin/", admin.site.urls),
     path("accounts/", include("apps.accounts.urls")),
     path("cases/", include("apps.cases.urls")),
     path("logs/", include("apps.logs.urls")),
-    path("auth/token/", obtain_auth_token, name="api_token_auth"),
+    path("auth/token/", CustomAuthToken.as_view(), name="api_token_auth"),
     path("auth/", include("django.contrib.auth.urls")),
 ]