[middleware] Added middleware

Author: VishvajitP

pyconbalkan/conference/middleware.py

@@ -0,0 +1,20 @@
+from pyconbalkan.conference.models import Conference
+
+
+class ConferenceSelectionMiddleware:
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        # Code to be executed for each request before
+        # the view (and later middleware) are called.
+
+        # Domain format : 2019.pyconbalkan.com
+        domain = request.META['HTTP_HOST']
+        conference = Conference.objects.get(year=domain.split('.')[0])
+        # Every request will have an atribute `conference` in it
+        # `conference` is the conference.models.Conference object for the
+        # respective year fetched from it's domain
+        request.conference = conference
+        response = self.get_response(request)
+        return response