core/homeassistant/components/mqtt/button.py

"""Support for MQTT buttons."""

from __future__ import annotations

import voluptuous as vol

from homeassistant.components import button
from homeassistant.components.button import DEVICE_CLASSES_SCHEMA, ButtonEntity
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import CONF_DEVICE_CLASS, CONF_NAME
from homeassistant.core import HomeAssistant, callback
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entity_platform import AddEntitiesCallback
from homeassistant.helpers.typing import ConfigType

from .config import DEFAULT_RETAIN, MQTT_BASE_SCHEMA
from .const import CONF_COMMAND_TEMPLATE, CONF_COMMAND_TOPIC, CONF_RETAIN
from .mixins import MqttEntity, async_setup_entity_entry_helper
from .models import MqttCommandTemplate
from .schemas import MQTT_ENTITY_COMMON_SCHEMA
from .util import valid_publish_topic

CONF_PAYLOAD_PRESS = "payload_press"
DEFAULT_NAME = "MQTT Button"
DEFAULT_PAYLOAD_PRESS = "PRESS"

PLATFORM_SCHEMA_MODERN = MQTT_BASE_SCHEMA.extend(
    {
        vol.Optional(CONF_COMMAND_TEMPLATE): cv.template,
        vol.Required(CONF_COMMAND_TOPIC): valid_publish_topic,
        vol.Optional(CONF_DEVICE_CLASS): vol.Any(DEVICE_CLASSES_SCHEMA, None),
        vol.Optional(CONF_NAME): vol.Any(cv.string, None),
        vol.Optional(CONF_PAYLOAD_PRESS, default=DEFAULT_PAYLOAD_PRESS): cv.string,
        vol.Optional(CONF_RETAIN, default=DEFAULT_RETAIN): cv.boolean,
    }
).extend(MQTT_ENTITY_COMMON_SCHEMA.schema)

DISCOVERY_SCHEMA = PLATFORM_SCHEMA_MODERN.extend({}, extra=vol.REMOVE_EXTRA)


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up MQTT button through YAML and through MQTT discovery."""
    async_setup_entity_entry_helper(
        hass,
        config_entry,
        MqttButton,
        button.DOMAIN,
        async_add_entities,
        DISCOVERY_SCHEMA,
        PLATFORM_SCHEMA_MODERN,
    )


class MqttButton(MqttEntity, ButtonEntity):
    """Representation of a switch that can be toggled using MQTT."""

    _default_name = DEFAULT_NAME
    _entity_id_format = button.ENTITY_ID_FORMAT

    @staticmethod
    def config_schema() -> vol.Schema:
        """Return the config schema."""
        return DISCOVERY_SCHEMA

    def _setup_from_config(self, config: ConfigType) -> None:
        """(Re)Setup the entity."""
        self._command_template = MqttCommandTemplate(
            config.get(CONF_COMMAND_TEMPLATE), entity=self
        ).async_render
        self._attr_device_class = self._config.get(CONF_DEVICE_CLASS)

    @callback
    def _prepare_subscribe_topics(self) -> None:
        """(Re)Subscribe to topics."""

    async def _subscribe_topics(self) -> None:
        """(Re)Subscribe to topics."""

    async def async_press(self) -> None:
        """Turn the device on.

        This method is a coroutine.
        """
        payload = self._command_template(self._config[CONF_PAYLOAD_PRESS])
        await self.async_publish_with_config(self._config[CONF_COMMAND_TOPIC], payload)