Check config to use config platforms (#43407)

homeassistant/helpers/check_config.py

@@ -123,6 +123,32 @@ async def async_check_ha_config_file(hass: HomeAssistant) -> HomeAssistantConfig
             result.add_error(f"Component error: {domain} - {ex}")
             continue
 
+        # Check if the integration has a custom config validator
+        config_validator = None
+        try:
+            config_validator = integration.get_platform("config")
+        except ImportError as err:
+            # Filter out import error of the config platform.
+            # If the config platform contains bad imports, make sure
+            # that still fails.
+            if err.name != f"{integration.pkg_path}.config":
+                result.add_error(f"Error importing config platform {domain}: {err}")
+                continue
+
+        if config_validator is not None and hasattr(
+            config_validator, "async_validate_config"
+        ):
+            try:
+                return await config_validator.async_validate_config(  # type: ignore
+                    hass, config
+                )
+            except (vol.Invalid, HomeAssistantError) as ex:
+                _comp_error(ex, domain, config)
+                continue
+            except Exception:  # pylint: disable=broad-except
+                result.add_error("Unknown error calling %s config validator", domain)
+                continue
+
         config_schema = getattr(component, "CONFIG_SCHEMA", None)
         if config_schema is not None:
             try:

tests/helpers/test_check_config.py

@@ -133,3 +133,36 @@ async def test_bootstrap_error(hass, loop):
         # Only 1 error expected
         res.errors.pop(0)
         assert not res.errors
+
+
+async def test_automation_config_platform(hass):
+    """Test automation async config."""
+    files = {
+        YAML_CONFIG_FILE: BASE_CONFIG
+        + """
+automation:
+  use_blueprint:
+    path: test_event_service.yaml
+    input:
+      trigger_event: blueprint_event
+      service_to_call: test.automation
+""",
+        hass.config.path(
+            "blueprints/automation/test_event_service.yaml"
+        ): """
+blueprint:
+  name: "Call service based on event"
+  domain: automation
+  input:
+    trigger_event:
+    service_to_call:
+trigger:
+  platform: event
+  event_type: !placeholder trigger_event
+action:
+  service: !placeholder service_to_call
+""",
+    }
+    with patch("os.path.isfile", return_value=True), patch_yaml_files(files):
+        res = await async_check_ha_config_file(hass)
+        assert len(res["automation"]) == 1