The app is great! 😀 You do a great job for Django users!

However, a nice feature would to have admin toggler turning the 503 mode on and off. Something like this.

I know it's quite simple to implement, for instance by adding a view as follows:

from django.core.exceptions import PermissionDenied
from django.shortcuts import redirect
from maintenance_mode.core import get_maintenance_mode, set_maintenance_mode


def toggle_maintenance_mode(request):
    """
    Toggle between 'on' and 'off' mode of the maintenance mode.
    """
    if request.user.is_superuser:
        set_maintenance_mode(not get_maintenance_mode())
        return redirect(request.GET.get("next")) or "/"

    raise PermissionDenied

the corresponding URL path, a overriden admin/base.html template:

{% block userlinks %}
  {% if maintenance_mode %}<strong>{% endif %}{% translate "Maintenance mode" %}{% if maintenance_mode %}</strong>{% endif %}
  <a href="{% url 'maintenance_mode_toggle' %}?next={{ request.path }}">{% if maintenance_mode %}{% translate "OFF" %}{% else %}{% translate "ON" %}{% endif %}</a>
  &bull;
  {{ block.super }}
{% endblock %}

I did this in my project and had to additionally add /maintenance-mode/ to the MAINTENANCE_MODE_IGNORE_URLS settings, because redirects were blocked by the app.

Feel free to use this idea. I have no abilities to write tests.