148 lines
4.5 KiB
Python
148 lines
4.5 KiB
Python
"""Support for getting data from websites with scraping."""
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import logging
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import voluptuous as vol
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from requests.auth import HTTPBasicAuth, HTTPDigestAuth
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from homeassistant.components.sensor import PLATFORM_SCHEMA
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from homeassistant.components.rest.sensor import RestData
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from homeassistant.const import (
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CONF_NAME,
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CONF_RESOURCE,
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CONF_UNIT_OF_MEASUREMENT,
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CONF_VALUE_TEMPLATE,
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CONF_VERIFY_SSL,
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CONF_USERNAME,
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CONF_HEADERS,
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CONF_PASSWORD,
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CONF_AUTHENTICATION,
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HTTP_BASIC_AUTHENTICATION,
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HTTP_DIGEST_AUTHENTICATION,
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)
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from homeassistant.helpers.entity import Entity
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from homeassistant.exceptions import PlatformNotReady
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import homeassistant.helpers.config_validation as cv
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_LOGGER = logging.getLogger(__name__)
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CONF_ATTR = "attribute"
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CONF_SELECT = "select"
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CONF_INDEX = "index"
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DEFAULT_NAME = "Web scrape"
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DEFAULT_VERIFY_SSL = True
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PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
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{
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vol.Required(CONF_RESOURCE): cv.string,
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vol.Required(CONF_SELECT): cv.string,
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vol.Optional(CONF_ATTR): cv.string,
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vol.Optional(CONF_INDEX, default=0): cv.positive_int,
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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_NAME, default=DEFAULT_NAME): cv.string,
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vol.Optional(CONF_PASSWORD): cv.string,
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vol.Optional(CONF_UNIT_OF_MEASUREMENT): cv.string,
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vol.Optional(CONF_USERNAME): 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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}
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)
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def setup_platform(hass, config, add_entities, discovery_info=None):
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"""Set up the Web scrape sensor."""
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name = config.get(CONF_NAME)
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resource = config.get(CONF_RESOURCE)
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method = "GET"
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payload = None
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headers = config.get(CONF_HEADERS)
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verify_ssl = config.get(CONF_VERIFY_SSL)
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select = config.get(CONF_SELECT)
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attr = config.get(CONF_ATTR)
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index = config.get(CONF_INDEX)
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unit = config.get(CONF_UNIT_OF_MEASUREMENT)
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username = config.get(CONF_USERNAME)
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password = config.get(CONF_PASSWORD)
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value_template = config.get(CONF_VALUE_TEMPLATE)
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if value_template is not None:
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value_template.hass = hass
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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 = HTTPDigestAuth(username, password)
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else:
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auth = HTTPBasicAuth(username, password)
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else:
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auth = None
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rest = RestData(method, resource, auth, headers, payload, verify_ssl)
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rest.update()
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if rest.data is None:
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raise PlatformNotReady
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add_entities(
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[ScrapeSensor(rest, name, select, attr, index, value_template, unit)], True
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)
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class ScrapeSensor(Entity):
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"""Representation of a web scrape sensor."""
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def __init__(self, rest, name, select, attr, index, value_template, unit):
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"""Initialize a web scrape sensor."""
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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._select = select
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self._attr = attr
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self._index = index
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self._value_template = value_template
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self._unit_of_measurement = unit
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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 state(self):
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"""Return the state of the device."""
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return self._state
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def update(self):
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"""Get the latest data from the source and updates the state."""
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self.rest.update()
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if self.rest.data is None:
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_LOGGER.error("Unable to retrieve data")
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return
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from bs4 import BeautifulSoup
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raw_data = BeautifulSoup(self.rest.data, "html.parser")
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_LOGGER.debug(raw_data)
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try:
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if self._attr is not None:
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value = raw_data.select(self._select)[self._index][self._attr]
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else:
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value = raw_data.select(self._select)[self._index].text
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_LOGGER.debug(value)
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except IndexError:
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_LOGGER.error("Unable to extract data from HTML")
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return
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if self._value_template is not None:
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self._state = self._value_template.render_with_possible_json_value(
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value, None
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)
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else:
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self._state = value
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