Service validation for browser component.

homeassistant/components/browser.py

@@ -4,10 +4,18 @@ Provides functionality to launch a web browser on the host machine.
 For more details about this component, please refer to the documentation at
 https://home-assistant.io/components/browser/
 """
+import voluptuous as vol
 
 DOMAIN = "browser"
 SERVICE_BROWSE_URL = "browse_url"
 
+ATTR_URL = 'url'
+ATTR_URL_DEFAULT = 'https://www.google.com'
+
+SERVICE_BROWSE_URL_SCHEMA = vol.Schema({
+    vol.Required(ATTR_URL, default=ATTR_URL_DEFAULT): vol.Url,
+})
+
 
 def setup(hass, config):
     """Listen for browse_url events."""
@@ -15,8 +23,7 @@ def setup(hass, config):
 
     hass.services.register(DOMAIN, SERVICE_BROWSE_URL,
                            lambda service:
-                           webbrowser.open(
-                               service.data.get(
-                                   'url', 'https://www.google.com')))
+                           webbrowser.open(service.data[ATTR_URL]),
+                           schema=SERVICE_BROWSE_URL_SCHEMA)
 
     return True