Add meta address key to setting

dmoj/settings.py

@@ -487,3 +487,6 @@ DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 
 # Chat
 CHAT_SECRET_KEY = "QUdVFsxk6f5-Hd8g9BXv81xMqvIZFRqMl-KbRzztW-U="
+
+# Nginx
+META_REMOTE_ADDRESS_KEY = "REMOTE_ADDR"

judge/user_log.py

@@ -1,4 +1,5 @@
 from django.utils.timezone import now
+from django.conf import settings
 
 from judge.models import Profile
 
@@ -17,8 +18,8 @@ class LogUserAccessMiddleware(object):
         ):
             updates = {"last_access": now()}
             # Decided on using REMOTE_ADDR as nginx will translate it to the external IP that hits it.
-            if request.META.get("REMOTE_ADDR"):
-                updates["ip"] = request.META.get("REMOTE_ADDR")
+            if request.META.get(settings.META_REMOTE_ADDRESS_KEY):
+                updates["ip"] = request.META.get(settings.META_REMOTE_ADDRESS_KEY)
             Profile.objects.filter(user_id=request.user.pk).update(**updates)
 
         return response