Add url to validation (#2874)

* Add url to validation

* Fix pylint issue

* Clean-up

homeassistant/helpers/config_validation.py

@@ -1,5 +1,6 @@
 """Helpers for config validation using voluptuous."""
 from datetime import timedelta
+from urllib.parse import urlparse
 
 from typing import Any, Union, TypeVar, Callable, Sequence, List, Dict
 
@@ -255,6 +256,17 @@ def time_zone(value):
 weekdays = vol.All(ensure_list, [vol.In(WEEKDAYS)])
 
 
+# pylint: disable=no-value-for-parameter
+def url(value: Any) -> str:
+    """Validate an URL."""
+    url_in = str(value)
+
+    if urlparse(url_in).scheme in ['http', 'https']:
+        return vol.Schema(vol.Url())(url_in)
+
+    raise vol.Invalid('invalid url')
+
+
 # Validator helpers
 
 def key_dependency(key, dependency):

tests/helpers/test_config_validation.py

@@ -48,10 +48,10 @@ def test_longitude():
 
 
 def test_port():
-    """Test tcp/udp network port."""
+    """Test TCP/UDP network port."""
     schema = vol.Schema(cv.port)
 
-    for value in('invalid', None, -1, 0, 80000, '81000'):
+    for value in ('invalid', None, -1, 0, 80000, '81000'):
         with pytest.raises(vol.MultipleInvalid):
             schema(value)
 
@@ -59,6 +59,21 @@ def test_port():
         schema(value)
 
 
+def test_url():
+    """Test URL."""
+    schema = vol.Schema(cv.url)
+
+    for value in ('invalid', None, 100, 'htp://ha.io', 'http//ha.io',
+                  'http://??,**', 'https://??,**'):
+        with pytest.raises(vol.MultipleInvalid):
+            schema(value)
+
+    for value in ('http://localhost', 'https://localhost/test/index.html',
+                  'http://home-assistant.io', 'http://home-assistant.io/test/',
+                  'https://community.home-assistant.io/'):
+        assert schema(value)
+
+
 def test_platform_config():
     """Test platform config validation."""
     for value in (