Add Risco integration (#36930)

* Risco integration

* Fix lint errors

* Raise ConfigEntryNotReady if can't connect

* Gracefully handle shutdown

* pass session to pyrisco

* minor change to init

* Fix retries

* Add exception log

* Remove retries

* Address code review comments

* Remove log

homeassistant/components/risco/config_flow.py

@@ -0,0 +1,58 @@
+"""Config flow for Risco integration."""
+import logging
+
+from pyrisco import CannotConnectError, RiscoAPI, UnauthorizedError
+import voluptuous as vol
+
+from homeassistant import config_entries, core
+from homeassistant.const import CONF_PASSWORD, CONF_PIN, CONF_USERNAME
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
+
+from .const import DOMAIN  # pylint:disable=unused-import
+
+_LOGGER = logging.getLogger(__name__)
+
+
+DATA_SCHEMA = vol.Schema({CONF_USERNAME: str, CONF_PASSWORD: str, CONF_PIN: str})
+
+
+async def validate_input(hass: core.HomeAssistant, data):
+    """Validate the user input allows us to connect.
+
+    Data has the keys from DATA_SCHEMA with values provided by the user.
+    """
+    risco = RiscoAPI(data[CONF_USERNAME], data[CONF_PASSWORD], data[CONF_PIN])
+
+    try:
+        await risco.login(async_get_clientsession(hass))
+    finally:
+        await risco.close()
+
+    return {"title": risco.site_name}
+
+
+class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
+    """Handle a config flow for Risco."""
+
+    VERSION = 1
+    CONNECTION_CLASS = config_entries.CONN_CLASS_CLOUD_POLL
+
+    async def async_step_user(self, user_input=None):
+        """Handle the initial step."""
+        errors = {}
+        if user_input is not None:
+            try:
+                info = await validate_input(self.hass, user_input)
+
+                return self.async_create_entry(title=info["title"], data=user_input)
+            except CannotConnectError:
+                errors["base"] = "cannot_connect"
+            except UnauthorizedError:
+                errors["base"] = "invalid_auth"
+            except Exception:  # pylint: disable=broad-except
+                _LOGGER.exception("Unexpected exception")
+                errors["base"] = "unknown"
+
+        return self.async_show_form(
+            step_id="user", data_schema=DATA_SCHEMA, errors=errors
+        )