from django.contrib.auth import login

def login_user (request):
if request.user.is_authenticated():
    return redirect('home')
else:
    message = None
    if request.method == "POST":
        form = LoginForm(request.POST)
        if form.is_valid():
            username = request.POST['username']
            password = request.POST['password']
            if '@' in username:
                kwargs = {'email': username}
            else:
                kwargs = {'username': username}
            try:
                user = User.objects.get(**kwargs)
                if user.check_password(password):
                    if user.is_active:
                        login(request, user)
                        return redirect('home')
            except User.DoesNotExist:
                form = LoginForm()
                return redirect('home')