70 lines
2.2 KiB
Python
70 lines
2.2 KiB
Python
"""Support for One-Time Password (OTP)."""
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from __future__ import annotations
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import time
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import pyotp
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from homeassistant.components.sensor import SensorEntity
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from homeassistant.config_entries import ConfigEntry
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from homeassistant.const import CONF_NAME, CONF_TOKEN
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from homeassistant.core import HomeAssistant, callback
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from homeassistant.helpers.device_registry import DeviceEntryType, DeviceInfo
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from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
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from homeassistant.helpers.typing import StateType
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from .const import DOMAIN
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TIME_STEP = 30 # Default time step assumed by Google Authenticator
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async def async_setup_entry(
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hass: HomeAssistant,
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entry: ConfigEntry,
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async_add_entities: AddConfigEntryEntitiesCallback,
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) -> None:
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"""Set up the OTP sensor."""
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async_add_entities(
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[TOTPSensor(entry.data[CONF_NAME], entry.data[CONF_TOKEN], entry.entry_id)],
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True,
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)
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# Only TOTP supported at the moment, HOTP might be added later
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class TOTPSensor(SensorEntity):
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"""Representation of a TOTP sensor."""
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_attr_translation_key = "token"
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_attr_should_poll = False
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_attr_native_value: StateType = None
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_next_expiration: float | None = None
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_attr_has_entity_name = True
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_attr_name = None
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def __init__(self, name: str, token: str, entry_id: str) -> None:
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"""Initialize the sensor."""
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self._attr_unique_id = entry_id
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self._otp = pyotp.TOTP(token)
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self.device_info = DeviceInfo(
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name=name,
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entry_type=DeviceEntryType.SERVICE,
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identifiers={(DOMAIN, entry_id)},
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)
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async def async_added_to_hass(self) -> None:
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"""Handle when an entity is about to be added to Home Assistant."""
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self._call_loop()
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@callback
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def _call_loop(self) -> None:
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self._attr_native_value = self._otp.now()
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self.async_write_ha_state()
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# Update must occur at even TIME_STEP, e.g. 12:00:00, 12:00:30,
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# 12:01:00, etc. in order to have synced time (see RFC6238)
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self._next_expiration = TIME_STEP - (time.time() % TIME_STEP)
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self.hass.loop.call_later(self._next_expiration, self._call_loop)
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