Add middleware support for detecting user timezones

polyclinic_scheduling/apps/RUG_template/middleware.py

@@ -0,0 +1,38 @@
+import pytz
+import requests
+
+from ipware import get_client_ip
+from django.utils import timezone
+
+# make sure you add `TimezoneMiddleware` appropriately in settings.py: 'apps.RUG_template.middleware.TimezoneMiddleware'
+class TimezoneMiddleware:
+    """ Middleware to check user timezone. """
+    def __init__(self, get_response):
+        self.get_response = get_response
+        # One-time configuration and initialization.
+
+    def __call__(self, request):
+        # Code to be executed for each request before
+        # the view (and later middleware) are called.
+        client_ip, is_routable = get_client_ip(request)
+        user_time_zone = request.session.get('user_time_zone', None)
+        try:
+            if user_time_zone is None and is_routable and client_ip is not None:
+                # Here we use an online service to get visitor info. Maybe not the nicest way to do it, but it is a way
+                # Also we only check when we get a public IP address. Local networks will not be checked online
+                # https://freegeoip.app
+                freegeoip_response = requests.get('https://freegeoip.app/json/{0}'.format(client_ip))
+                freegeoip_response_json = freegeoip_response.json()
+                user_time_zone = freegeoip_response_json['time_zone']
+                if user_time_zone:
+                    request.session['user_time_zone'] = user_time_zone
+            timezone.activate(pytz.timezone(user_time_zone))
+        except:
+            pass
+
+        response = self.get_response(request)
+
+        # Code to be executed for each request/response after
+        # the view is called.
+
+        return response