Check that no configuration is provided (#3553)

homeassistant/components/zeroconf.py

@@ -1,25 +1,28 @@
 """
 This module exposes Home Assistant via Zeroconf.
 
-Zeroconf is also known as Bonjour, Avahi or Multicast DNS (mDNS).
-
-For more details about Zeroconf, please refer to the documentation at
+For more details about this component, please refer to the documentation at
 https://home-assistant.io/components/zeroconf/
 """
 import logging
 import socket
 
+import voluptuous as vol
+
 from homeassistant.const import (EVENT_HOMEASSISTANT_STOP, __version__)
 
-REQUIREMENTS = ["zeroconf==0.17.6"]
-
-DEPENDENCIES = ["api"]
-
 _LOGGER = logging.getLogger(__name__)
 
-DOMAIN = "zeroconf"
+DEPENDENCIES = ['api']
+DOMAIN = 'zeroconf'
 
-ZEROCONF_TYPE = "_home-assistant._tcp.local."
+REQUIREMENTS = ['zeroconf==0.17.6']
+
+ZEROCONF_TYPE = '_home-assistant._tcp.local.'
+
+CONFIG_SCHEMA = vol.Schema({
+    DOMAIN: vol.Schema({}),
+}, extra=vol.ALLOW_EXTRA)
 
 
 def setup(hass, config):
@@ -28,12 +31,14 @@ def setup(hass, config):
 
     zeroconf = Zeroconf()
 
-    zeroconf_name = "{}.{}".format(hass.config.location_name,
-                                   ZEROCONF_TYPE)
+    zeroconf_name = '{}.{}'.format(hass.config.location_name, ZEROCONF_TYPE)
 
-    requires_api_password = (hass.config.api.api_password is not None)
-    params = {"version": __version__, "base_url": hass.config.api.base_url,
-              "requires_api_password": requires_api_password}
+    requires_api_password = hass.config.api.api_password is not None
+    params = {
+        'version': __version__,
+        'base_url': hass.config.api.base_url,
+        'requires_api_password': requires_api_password,
+    }
 
     info = ServiceInfo(ZEROCONF_TYPE, zeroconf_name,
                        socket.inet_aton(hass.config.api.host),