Add Tailscale integration (#59764)

* Add Tailscale integration

* Use DeviceEntryType

* Fix tests

* Adjust to new Pylint version

* Use enums for device classes

* Update homeassistant/components/tailscale/config_flow.py

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

* Pass empty string as default

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

homeassistant/components/tailscale/binary_sensor.py

@@ -0,0 +1,112 @@
+"""Support for Tailscale binary sensors."""
+from __future__ import annotations
+
+from collections.abc import Callable
+from dataclasses import dataclass
+
+from tailscale import Device as TailscaleDevice
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorDeviceClass,
+    BinarySensorEntity,
+    BinarySensorEntityDescription,
+)
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.device_registry import DeviceEntryType
+from homeassistant.helpers.entity import DeviceInfo
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import (
+    CoordinatorEntity,
+    DataUpdateCoordinator,
+)
+
+from .const import DOMAIN
+
+
+@dataclass
+class TailscaleBinarySensorEntityDescriptionMixin:
+    """Mixin for required keys."""
+
+    is_on_fn: Callable[[TailscaleDevice], bool | None]
+
+
+@dataclass
+class TailscaleBinarySensorEntityDescription(
+    BinarySensorEntityDescription, TailscaleBinarySensorEntityDescriptionMixin
+):
+    """Describes a Tailscale binary sensor entity."""
+
+
+BINARY_SENSORS: tuple[TailscaleBinarySensorEntityDescription, ...] = (
+    TailscaleBinarySensorEntityDescription(
+        key="update_available",
+        name="Client",
+        device_class=BinarySensorDeviceClass.UPDATE,
+        is_on_fn=lambda device: device.update_available,
+    ),
+)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up a Tailscale binary sensors based on a config entry."""
+    coordinator = hass.data[DOMAIN][entry.entry_id]
+    async_add_entities(
+        TailscaleBinarySensorEntity(
+            coordinator=coordinator,
+            device=device,
+            description=description,
+        )
+        for device in coordinator.data.values()
+        for description in BINARY_SENSORS
+    )
+
+
+class TailscaleBinarySensorEntity(CoordinatorEntity, BinarySensorEntity):
+    """Defines a Tailscale binary sensor."""
+
+    entity_description: TailscaleBinarySensorEntityDescription
+
+    def __init__(
+        self,
+        *,
+        coordinator: DataUpdateCoordinator,
+        device: TailscaleDevice,
+        description: TailscaleBinarySensorEntityDescription,
+    ) -> None:
+        """Initialize a Tailscale binary sensor."""
+        super().__init__(coordinator=coordinator)
+        self.entity_description = description
+        self.device_id = device.device_id
+        self._attr_name = f"{device.hostname} {description.name}"
+        self._attr_unique_id = f"{device.device_id}_{description.key}"
+
+    @property
+    def device_info(self) -> DeviceInfo:
+        """Return the device info."""
+        device: TailscaleDevice = self.coordinator.data[self.device_id]
+
+        configuration_url = "https://login.tailscale.com/admin/machines/"
+        if device.addresses:
+            configuration_url += device.addresses[0]
+
+        return DeviceInfo(
+            configuration_url=configuration_url,
+            entry_type=DeviceEntryType.SERVICE,
+            identifiers={(DOMAIN, device.device_id)},
+            manufacturer="Tailscale Inc.",
+            model=device.os,
+            name=device.hostname,
+            sw_version=device.client_version,
+        )
+
+    @property
+    def is_on(self) -> bool:
+        """Return the state of the sensor."""
+        return bool(
+            self.entity_description.is_on_fn(self.coordinator.data[self.device_id])
+        )