Return the server address dynamically

admin/mailu/internal/nginx.py

@@ -1,5 +1,7 @@
 from mailu import db, models
 
+import socket
+
 
 SUPPORTED_AUTH_METHODS = ["none", "plain"]
 
@@ -12,6 +14,12 @@ STATUSES = {
 }
 
 
+SERVER_MAP = {
+    "imap": ("imap", 143),
+    "smtp": ("smtp", 25)
+}
+
+
 def handle_authentication(headers):
     """ Handle an HTTP nginx authentication request
     See: http://nginx.org/en/docs/mail/ngx_mail_auth_http_module.html#protocol
@@ -57,8 +65,6 @@ def get_status(protocol, status):
 
 
 def get_server(protocol):
-    servers = {
-        "imap": ("172.18.0.12", 143),
-        "smtp": ("172.18.0.9", 25)
-    }
-    return servers[protocol]
+    hostname, port = SERVER_MAP[protocol]
+    address = socket.gethostbyname(hostname)
+    return address, port

admin/mailu/internal/views.py

@@ -11,4 +11,3 @@ def nginx_authentication():
     for key, value in headers.items():
         response.headers[key] = str(value)
     return response
-