281 lines
9.2 KiB
Python
281 lines
9.2 KiB
Python
"""Support for RESTful API sensors."""
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import json
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import logging
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from xml.parsers.expat import ExpatError
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import httpx
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from jsonpath import jsonpath
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import voluptuous as vol
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import xmltodict
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from homeassistant.components.sensor import DEVICE_CLASSES_SCHEMA, PLATFORM_SCHEMA
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from homeassistant.const import (
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CONF_AUTHENTICATION,
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CONF_DEVICE_CLASS,
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CONF_FORCE_UPDATE,
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CONF_HEADERS,
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CONF_METHOD,
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CONF_NAME,
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CONF_PARAMS,
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CONF_PASSWORD,
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CONF_PAYLOAD,
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CONF_RESOURCE,
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CONF_RESOURCE_TEMPLATE,
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CONF_TIMEOUT,
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CONF_UNIT_OF_MEASUREMENT,
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CONF_USERNAME,
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CONF_VALUE_TEMPLATE,
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CONF_VERIFY_SSL,
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HTTP_BASIC_AUTHENTICATION,
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HTTP_DIGEST_AUTHENTICATION,
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)
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from homeassistant.exceptions import PlatformNotReady
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import homeassistant.helpers.config_validation as cv
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from homeassistant.helpers.entity import Entity
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from homeassistant.helpers.reload import async_setup_reload_service
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from . import DOMAIN, PLATFORMS
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from .data import DEFAULT_TIMEOUT, RestData
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_LOGGER = logging.getLogger(__name__)
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DEFAULT_METHOD = "GET"
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DEFAULT_NAME = "REST Sensor"
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DEFAULT_VERIFY_SSL = True
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DEFAULT_FORCE_UPDATE = False
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CONF_JSON_ATTRS = "json_attributes"
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CONF_JSON_ATTRS_PATH = "json_attributes_path"
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METHODS = ["POST", "GET"]
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Exclusive(CONF_RESOURCE, CONF_RESOURCE): cv.url,
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vol.Exclusive(CONF_RESOURCE_TEMPLATE, CONF_RESOURCE): cv.template,
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vol.Optional(CONF_AUTHENTICATION): vol.In(
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[HTTP_BASIC_AUTHENTICATION, HTTP_DIGEST_AUTHENTICATION]
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),
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vol.Optional(CONF_HEADERS): vol.Schema({cv.string: cv.string}),
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vol.Optional(CONF_PARAMS): vol.Schema({cv.string: cv.string}),
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vol.Optional(CONF_JSON_ATTRS, default=[]): cv.ensure_list_csv,
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vol.Optional(CONF_METHOD, default=DEFAULT_METHOD): vol.In(METHODS),
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vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_PASSWORD): cv.string,
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vol.Optional(CONF_PAYLOAD): cv.string,
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vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
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vol.Optional(CONF_DEVICE_CLASS): DEVICE_CLASSES_SCHEMA,
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vol.Optional(CONF_USERNAME): cv.string,
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vol.Optional(CONF_JSON_ATTRS_PATH): cv.string,
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vol.Optional(CONF_VALUE_TEMPLATE): cv.template,
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vol.Optional(CONF_VERIFY_SSL, default=DEFAULT_VERIFY_SSL): cv.boolean,
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vol.Optional(CONF_FORCE_UPDATE, default=DEFAULT_FORCE_UPDATE): cv.boolean,
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vol.Optional(CONF_TIMEOUT, default=DEFAULT_TIMEOUT): cv.positive_int,
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}
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)
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PLATFORM_SCHEMA = vol.All(
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cv.has_at_least_one_key(CONF_RESOURCE, CONF_RESOURCE_TEMPLATE), PLATFORM_SCHEMA
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)
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async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
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"""Set up the RESTful sensor."""
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await async_setup_reload_service(hass, DOMAIN, PLATFORMS)
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name = config.get(CONF_NAME)
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resource = config.get(CONF_RESOURCE)
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resource_template = config.get(CONF_RESOURCE_TEMPLATE)
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method = config.get(CONF_METHOD)
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payload = config.get(CONF_PAYLOAD)
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verify_ssl = config.get(CONF_VERIFY_SSL)
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username = config.get(CONF_USERNAME)
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password = config.get(CONF_PASSWORD)
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headers = config.get(CONF_HEADERS)
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params = config.get(CONF_PARAMS)
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unit = config.get(CONF_UNIT_OF_MEASUREMENT)
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device_class = config.get(CONF_DEVICE_CLASS)
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value_template = config.get(CONF_VALUE_TEMPLATE)
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json_attrs = config.get(CONF_JSON_ATTRS)
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json_attrs_path = config.get(CONF_JSON_ATTRS_PATH)
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force_update = config.get(CONF_FORCE_UPDATE)
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timeout = config.get(CONF_TIMEOUT)
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if value_template is not None:
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value_template.hass = hass
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if resource_template is not None:
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resource_template.hass = hass
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resource = resource_template.async_render(parse_result=False)
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if username and password:
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if config.get(CONF_AUTHENTICATION) == HTTP_DIGEST_AUTHENTICATION:
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auth = httpx.DigestAuth(username, password)
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else:
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auth = (username, password)
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else:
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auth = None
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rest = RestData(
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hass, method, resource, auth, headers, params, payload, verify_ssl, timeout
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)
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await rest.async_update()
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if rest.data is None:
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raise PlatformNotReady
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# Must update the sensor now (including fetching the rest resource) to
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# ensure it's updating its state.
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async_add_entities(
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[
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RestSensor(
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hass,
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rest,
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name,
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unit,
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device_class,
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value_template,
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json_attrs,
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force_update,
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resource_template,
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json_attrs_path,
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)
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],
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)
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class RestSensor(Entity):
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"""Implementation of a REST sensor."""
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def __init__(
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self,
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hass,
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rest,
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name,
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unit_of_measurement,
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device_class,
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value_template,
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json_attrs,
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force_update,
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resource_template,
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json_attrs_path,
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):
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"""Initialize the REST sensor."""
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self._hass = hass
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self.rest = rest
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self._name = name
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self._state = None
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self._unit_of_measurement = unit_of_measurement
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self._device_class = device_class
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self._value_template = value_template
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self._json_attrs = json_attrs
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self._attributes = None
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self._force_update = force_update
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self._resource_template = resource_template
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self._json_attrs_path = json_attrs_path
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@property
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def name(self):
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"""Return the name of the sensor."""
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return self._name
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@property
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def unit_of_measurement(self):
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"""Return the unit the value is expressed in."""
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return self._unit_of_measurement
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@property
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def device_class(self):
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"""Return the class of this sensor."""
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return self._device_class
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@property
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def available(self):
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"""Return if the sensor data are available."""
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return self.rest.data is not None
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@property
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def state(self):
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"""Return the state of the device."""
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return self._state
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@property
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def force_update(self):
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"""Force update."""
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return self._force_update
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async def async_update(self):
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"""Get the latest data from REST API and update the state."""
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if self._resource_template is not None:
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self.rest.set_url(self._resource_template.async_render(parse_result=False))
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await self.rest.async_update()
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self._update_from_rest_data()
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async def async_added_to_hass(self):
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"""Ensure the data from the initial update is reflected in the state."""
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self._update_from_rest_data()
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def _update_from_rest_data(self):
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"""Update state from the rest data."""
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value = self.rest.data
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_LOGGER.debug("Data fetched from resource: %s", value)
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if self.rest.headers is not None:
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# If the http request failed, headers will be None
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content_type = self.rest.headers.get("content-type")
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if content_type and (
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content_type.startswith("text/xml")
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or content_type.startswith("application/xml")
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or content_type.startswith("application/xhtml+xml")
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):
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try:
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value = json.dumps(xmltodict.parse(value))
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_LOGGER.debug("JSON converted from XML: %s", value)
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except ExpatError:
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_LOGGER.warning(
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"REST xml result could not be parsed and converted to JSON"
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)
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_LOGGER.debug("Erroneous XML: %s", value)
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if self._json_attrs:
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self._attributes = {}
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if value:
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try:
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json_dict = json.loads(value)
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if self._json_attrs_path is not None:
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json_dict = jsonpath(json_dict, self._json_attrs_path)
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# jsonpath will always store the result in json_dict[0]
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# so the next line happens to work exactly as needed to
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# find the result
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if isinstance(json_dict, list):
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json_dict = json_dict[0]
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if isinstance(json_dict, dict):
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attrs = {
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k: json_dict[k] for k in self._json_attrs if k in json_dict
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}
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self._attributes = attrs
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else:
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_LOGGER.warning(
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"JSON result was not a dictionary"
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" or list with 0th element a dictionary"
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)
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except ValueError:
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_LOGGER.warning("REST result could not be parsed as JSON")
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_LOGGER.debug("Erroneous JSON: %s", value)
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else:
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_LOGGER.warning("Empty reply found when expecting JSON data")
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if value is not None and self._value_template is not None:
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value = self._value_template.async_render_with_possible_json_value(
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value, None
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)
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self._state = value
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@property
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def device_state_attributes(self):
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"""Return the state attributes."""
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return self._attributes
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