From 84205a9a5731d8ee9c001edd98b26518b82f81a9 Mon Sep 17 00:00:00 2001
From: arunderwood <arunderwood@users.noreply.github.com>
Date: Mon, 31 Aug 2020 05:48:55 -0400
Subject: [PATCH] route53 - support updating base domain (#39264)

---
 homeassistant/components/route53/__init__.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/homeassistant/components/route53/__init__.py b/homeassistant/components/route53/__init__.py
index 5355ed15f38..1061b7979ba 100644
--- a/homeassistant/components/route53/__init__.py
+++ b/homeassistant/components/route53/__init__.py
@@ -66,6 +66,12 @@ def setup(hass, config):
     return True
 
 
+def _get_fqdn(record, domain):
+    if record == ".":
+        return domain
+    return f"{record}.{domain}"
+
+
 def _update_route53(
     aws_access_key_id: str,
     aws_secret_access_key: str,
@@ -98,7 +104,7 @@ def _update_route53(
             {
                 "Action": "UPSERT",
                 "ResourceRecordSet": {
-                    "Name": f"{record}.{domain}",
+                    "Name": _get_fqdn(record, domain),
                     "Type": "A",
                     "TTL": ttl,
                     "ResourceRecords": [{"Value": ipaddress}],