Start preparing for homekit_controller config entries (#21564)

* Start preparing for homekit_controller config entries

* Review feedback

* Review feedback

* Only use the vol.strip validator for pairing_code

* CV not required now

* Changes from review

* Changes after review

homeassistant/components/homekit_controller/connection.py

@@ -0,0 +1,35 @@
+"""Helpers for managing a pairing with a HomeKit accessory or bridge."""
+
+
+def get_accessory_information(accessory):
+    """Obtain the accessory information service of a HomeKit device."""
+    # pylint: disable=import-error
+    from homekit.model.services import ServicesTypes
+    from homekit.model.characteristics import CharacteristicsTypes
+
+    result = {}
+    for service in accessory['services']:
+        stype = service['type'].upper()
+        if ServicesTypes.get_short(stype) != 'accessory-information':
+            continue
+        for characteristic in service['characteristics']:
+            ctype = CharacteristicsTypes.get_short(characteristic['type'])
+            if 'value' in characteristic:
+                result[ctype] = characteristic['value']
+    return result
+
+
+def get_bridge_information(accessories):
+    """Return the accessory info for the bridge."""
+    for accessory in accessories:
+        if accessory['aid'] == 1:
+            return get_accessory_information(accessory)
+    return get_accessory_information(accessories[0])
+
+
+def get_accessory_name(accessory_info):
+    """Return the name field of an accessory."""
+    for field in ('name', 'model', 'manufacturer'):
+        if field in accessory_info:
+            return accessory_info[field]
+    return None