Add config flow for nuki (#45664)

* implemented config_flow for nuki component

* warn -> warning

* exception handling & config_flow tests

* gen_requirements_all

* Update config_flow.py

Co-authored-by: Pascal Vizeli <pascal.vizeli@syshack.ch>

homeassistant/components/nuki/config_flow.py

@@ -0,0 +1,97 @@
+"""Config flow to configure the Nuki integration."""
+import logging
+
+from pynuki import NukiBridge
+from pynuki.bridge import InvalidCredentialsException
+from requests.exceptions import RequestException
+import voluptuous as vol
+
+from homeassistant import config_entries, exceptions
+from homeassistant.const import CONF_HOST, CONF_PORT, CONF_TOKEN
+
+from .const import (  # pylint: disable=unused-import
+    DEFAULT_PORT,
+    DEFAULT_TIMEOUT,
+    DOMAIN,
+)
+
+_LOGGER = logging.getLogger(__name__)
+
+USER_SCHEMA = vol.Schema(
+    {
+        vol.Required(CONF_HOST): str,
+        vol.Optional(CONF_PORT, default=DEFAULT_PORT): vol.Coerce(int),
+        vol.Required(CONF_TOKEN): str,
+    }
+)
+
+
+async def validate_input(hass, data):
+    """Validate the user input allows us to connect.
+
+    Data has the keys from USER_SCHEMA with values provided by the user.
+    """
+
+    try:
+        bridge = await hass.async_add_executor_job(
+            NukiBridge,
+            data[CONF_HOST],
+            data[CONF_TOKEN],
+            data[CONF_PORT],
+            True,
+            DEFAULT_TIMEOUT,
+        )
+
+        info = bridge.info()
+    except InvalidCredentialsException as err:
+        raise InvalidAuth from err
+    except RequestException as err:
+        raise CannotConnect from err
+
+    return info
+
+
+class NukiConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
+    """Nuki config flow."""
+
+    async def async_step_import(self, user_input=None):
+        """Handle a flow initiated by import."""
+        return await self.async_step_validate(user_input)
+
+    async def async_step_user(self, user_input=None):
+        """Handle a flow initiated by the user."""
+        return await self.async_step_validate(user_input)
+
+    async def async_step_validate(self, user_input):
+        """Handle init step of a flow."""
+
+        errors = {}
+        if user_input is not None:
+            try:
+                info = await validate_input(self.hass, user_input)
+            except CannotConnect:
+                errors["base"] = "cannot_connect"
+            except InvalidAuth:
+                errors["base"] = "invalid_auth"
+            except Exception:  # pylint: disable=broad-except
+                _LOGGER.exception("Unexpected exception")
+                errors["base"] = "unknown"
+
+            if "base" not in errors:
+                await self.async_set_unique_id(info["ids"]["hardwareId"])
+                self._abort_if_unique_id_configured()
+                return self.async_create_entry(
+                    title=info["ids"]["hardwareId"], data=user_input
+                )
+
+        return self.async_show_form(
+            step_id="user", data_schema=USER_SCHEMA, errors=errors
+        )
+
+
+class CannotConnect(exceptions.HomeAssistantError):
+    """Error to indicate we cannot connect."""
+
+
+class InvalidAuth(exceptions.HomeAssistantError):
+    """Error to indicate there is invalid auth."""