ha-core/homeassistant/components/mqtt/button.py

"""Support for MQTT buttons."""
from __future__ import annotations

import functools

import voluptuous as vol

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

from .config import DEFAULT_RETAIN, MQTT_BASE_SCHEMA
from .const import (
    CONF_COMMAND_TEMPLATE,
    CONF_COMMAND_TOPIC,
    CONF_ENCODING,
    CONF_QOS,
    CONF_RETAIN,
)
from .mixins import (
    MQTT_ENTITY_COMMON_SCHEMA,
    MqttEntity,
    async_discover_yaml_entities,
    async_setup_entry_helper,
    async_setup_platform_helper,
    warn_for_legacy_schema,
)
from .models import MqttCommandTemplate
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): button.DEVICE_CLASSES_SCHEMA,
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
        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)

# Configuring MQTT Buttons under the button platform key is deprecated in HA Core 2022.6
PLATFORM_SCHEMA = vol.All(
    cv.PLATFORM_SCHEMA.extend(PLATFORM_SCHEMA_MODERN.schema),
    warn_for_legacy_schema(button.DOMAIN),
)


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


async def async_setup_platform(
    hass: HomeAssistant,
    config: ConfigType,
    async_add_entities: AddEntitiesCallback,
    discovery_info: DiscoveryInfoType | None = None,
) -> None:
    """Set up MQTT button configured under the fan platform key (deprecated)."""
    # Deprecated in HA Core 2022.6
    await async_setup_platform_helper(
        hass,
        button.DOMAIN,
        discovery_info or config,
        async_add_entities,
        _async_setup_entity,
    )


async def async_setup_entry(
    hass: HomeAssistant,
    config_entry: ConfigEntry,
    async_add_entities: AddEntitiesCallback,
) -> None:
    """Set up MQTT button through configuration.yaml and dynamically through MQTT discovery."""
    # load and initialize platform config from configuration.yaml
    await async_discover_yaml_entities(hass, button.DOMAIN)
    # setup for discovery
    setup = functools.partial(
        _async_setup_entity, hass, async_add_entities, config_entry=config_entry
    )
    await async_setup_entry_helper(hass, button.DOMAIN, setup, DISCOVERY_SCHEMA)


async def _async_setup_entity(
    hass: HomeAssistant,
    async_add_entities: AddEntitiesCallback,
    config: ConfigType,
    config_entry: ConfigEntry | None = None,
    discovery_data: dict | None = None,
) -> None:
    """Set up the MQTT button."""
    async_add_entities([MqttButton(hass, config, config_entry, discovery_data)])


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

    _entity_id_format = button.ENTITY_ID_FORMAT

    def __init__(self, hass, config, config_entry, discovery_data):
        """Initialize the MQTT button."""
        MqttEntity.__init__(self, hass, config, config_entry, discovery_data)

    @staticmethod
    def config_schema():
        """Return the config schema."""
        return DISCOVERY_SCHEMA

    def _setup_from_config(self, config):
        """(Re)Setup the entity."""
        self._command_template = MqttCommandTemplate(
            config.get(CONF_COMMAND_TEMPLATE), entity=self
        ).async_render

    def _prepare_subscribe_topics(self):
        """(Re)Subscribe to topics."""

    async def _subscribe_topics(self):
        """(Re)Subscribe to topics."""

    @property
    def device_class(self) -> ButtonDeviceClass | None:
        """Return the device class of the sensor."""
        return self._config.get(CONF_DEVICE_CLASS)

    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(
            self._config[CONF_COMMAND_TOPIC],
            payload,
            self._config[CONF_QOS],
            self._config[CONF_RETAIN],
            self._config[CONF_ENCODING],
        )