Handle capitalized HomeKit property names (#21382)

The Velux ACTIVE gateway uses `C#` rather than `c#` as the name of
the property that holds the count of accessories. Apple's HomeKit docs
suggest that properties should be case-insensitive, so update the
code to not assume the property names are lower case.

homeassistant/components/homekit_controller/__init__.py

@@ -343,9 +343,17 @@ def setup(hass, config):
         # model, id
         host = discovery_info['host']
         port = discovery_info['port']
-        model = discovery_info['properties']['md']
-        hkid = discovery_info['properties']['id']
-        config_num = int(discovery_info['properties']['c#'])
+
+        # Fold property keys to lower case, making them effectively
+        # case-insensitive. Some HomeKit devices capitalize them.
+        properties = {
+            key.lower(): value
+            for (key, value) in discovery_info['properties'].items()
+        }
+
+        model = properties['md']
+        hkid = properties['id']
+        config_num = int(properties['c#'])
 
         if model in HOMEKIT_IGNORE:
             return

tests/components/homekit_controller/common.py

@@ -134,8 +134,11 @@ class FakeService(AbstractService):
         return char
 
 
-async def setup_test_component(hass, services):
-    """Load a fake homekit accessory based on a homekit accessory model."""
+async def setup_test_component(hass, services, capitalize=False):
+    """Load a fake homekit accessory based on a homekit accessory model.
+
+    If capitalize is True, property names will be in upper case.
+    """
     domain = None
     for service in services:
         service_name = ServicesTypes.get_short(service.type)
@@ -162,9 +165,9 @@ async def setup_test_component(hass, services):
         'host': '127.0.0.1',
         'port': 8080,
         'properties': {
-            'md': 'TestDevice',
-            'id': '00:00:00:00:00:00',
-            'c#': 1,
+            ('MD' if capitalize else 'md'): 'TestDevice',
+            ('ID' if capitalize else 'id'): '00:00:00:00:00:00',
+            ('C#' if capitalize else 'c#'): 1,
         }
     }
 

tests/components/homekit_controller/test_cover.py

@@ -70,6 +70,20 @@ def create_window_covering_service_with_v_tilt():
     return service
 
 
+async def test_accept_capitalized_property_names(hass, utcnow):
+    """Test that we can handle a device with capitalized property names."""
+    window_cover = create_window_covering_service()
+    helper = await setup_test_component(hass, [window_cover], capitalize=True)
+
+    # The specific interaction we do here doesn't matter; we just need
+    # to do *something* to ensure that discovery properly dealt with the
+    # capitalized property names.
+    await hass.services.async_call('cover', 'open_cover', {
+        'entity_id': helper.entity_id,
+    }, blocking=True)
+    assert helper.characteristics[POSITION_TARGET].value == 100
+
+
 async def test_change_window_cover_state(hass, utcnow):
     """Test that we can turn a HomeKit alarm on and off again."""
     window_cover = create_window_covering_service()