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March 25, 2019 15:05
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""" | |
HTML5 Push Messaging notification service. | |
For more details about this platform, please refer to the documentation at | |
https://home-assistant.io/components/notify.html5/ | |
""" | |
import datetime | |
import json | |
import logging | |
from functools import partial | |
import time | |
import uuid | |
from aiohttp.hdrs import AUTHORIZATION | |
import voluptuous as vol | |
from voluptuous.humanize import humanize_error | |
from homeassistant.util.json import load_json, save_json | |
from homeassistant.exceptions import HomeAssistantError | |
from homeassistant.components import websocket_api | |
from homeassistant.components.frontend import add_manifest_json_key | |
from homeassistant.components.http import HomeAssistantView | |
from homeassistant.components.notify import ( | |
ATTR_DATA, ATTR_TITLE, ATTR_TARGET, PLATFORM_SCHEMA, ATTR_TITLE_DEFAULT, | |
BaseNotificationService, DOMAIN) | |
from homeassistant.const import ( | |
URL_ROOT, HTTP_BAD_REQUEST, HTTP_UNAUTHORIZED, HTTP_INTERNAL_SERVER_ERROR) | |
from homeassistant.helpers import config_validation as cv | |
from homeassistant.util import ensure_unique_string | |
REQUIREMENTS = ['pywebpush==1.6.0'] | |
DEPENDENCIES = ['frontend'] | |
_LOGGER = logging.getLogger(__name__) | |
REGISTRATIONS_FILE = 'html5_push_registrations.conf' | |
SERVICE_DISMISS = 'html5_dismiss' | |
ATTR_GCM_SENDER_ID = 'gcm_sender_id' | |
ATTR_GCM_API_KEY = 'gcm_api_key' | |
ATTR_VAPID_PUB_KEY = 'vapid_pub_key' | |
ATTR_VAPID_PRV_KEY = 'vapid_prv_key' | |
ATTR_VAPID_EMAIL = 'vapid_email' | |
PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({ | |
vol.Optional(ATTR_GCM_SENDER_ID): cv.string, | |
vol.Optional(ATTR_GCM_API_KEY): cv.string, | |
vol.Optional(ATTR_VAPID_PUB_KEY): cv.string, | |
vol.Optional(ATTR_VAPID_PRV_KEY): cv.string, | |
vol.Optional(ATTR_VAPID_EMAIL): cv.string, | |
}) | |
ATTR_SUBSCRIPTION = 'subscription' | |
ATTR_BROWSER = 'browser' | |
ATTR_NAME = 'name' | |
ATTR_ENDPOINT = 'endpoint' | |
ATTR_KEYS = 'keys' | |
ATTR_AUTH = 'auth' | |
ATTR_P256DH = 'p256dh' | |
ATTR_EXPIRATIONTIME = 'expirationTime' | |
ATTR_TAG = 'tag' | |
ATTR_ACTION = 'action' | |
ATTR_ACTIONS = 'actions' | |
ATTR_TYPE = 'type' | |
ATTR_URL = 'url' | |
ATTR_DISMISS = 'dismiss' | |
ATTR_JWT = 'jwt' | |
WS_TYPE_APPKEY = 'notify/html5/appkey' | |
SCHEMA_WS_APPKEY = websocket_api.BASE_COMMAND_MESSAGE_SCHEMA.extend({ | |
vol.Required('type'): WS_TYPE_APPKEY | |
}) | |
# The number of days after the moment a notification is sent that a JWT | |
# is valid. | |
JWT_VALID_DAYS = 7 | |
KEYS_SCHEMA = vol.All( | |
dict, vol.Schema({ | |
vol.Required(ATTR_AUTH): cv.string, | |
vol.Required(ATTR_P256DH): cv.string, | |
}) | |
) | |
SUBSCRIPTION_SCHEMA = vol.All( | |
dict, vol.Schema({ | |
# pylint: disable=no-value-for-parameter | |
vol.Required(ATTR_ENDPOINT): vol.Url(), | |
vol.Required(ATTR_KEYS): KEYS_SCHEMA, | |
vol.Optional(ATTR_EXPIRATIONTIME): vol.Any(None, cv.positive_int), | |
}) | |
) | |
DISMISS_SERVICE_SCHEMA = vol.Schema({ | |
vol.Optional(ATTR_TARGET): vol.All(cv.ensure_list, [cv.string]), | |
vol.Optional(ATTR_DATA): dict, | |
}) | |
REGISTER_SCHEMA = vol.Schema({ | |
vol.Required(ATTR_SUBSCRIPTION): SUBSCRIPTION_SCHEMA, | |
vol.Required(ATTR_BROWSER): vol.In(['chrome', 'firefox']), | |
vol.Optional(ATTR_NAME): cv.string | |
}) | |
CALLBACK_EVENT_PAYLOAD_SCHEMA = vol.Schema({ | |
vol.Required(ATTR_TAG): cv.string, | |
vol.Required(ATTR_TYPE): vol.In(['received', 'clicked', 'closed']), | |
vol.Required(ATTR_TARGET): cv.string, | |
vol.Optional(ATTR_ACTION): cv.string, | |
vol.Optional(ATTR_DATA): dict, | |
}) | |
NOTIFY_CALLBACK_EVENT = 'html5_notification' | |
# Badge and timestamp are Chrome specific (not in official spec) | |
HTML5_SHOWNOTIFICATION_PARAMETERS = ( | |
'actions', 'badge', 'body', 'dir', 'icon', 'image', 'lang', | |
'renotify', 'requireInteraction', 'tag', 'timestamp', 'vibrate') | |
def get_service(hass, config, discovery_info=None): | |
"""Get the HTML5 push notification service.""" | |
json_path = hass.config.path(REGISTRATIONS_FILE) | |
registrations = _load_config(json_path) | |
if registrations is None: | |
return None | |
vapid_pub_key = config.get(ATTR_VAPID_PUB_KEY) | |
vapid_prv_key = config.get(ATTR_VAPID_PRV_KEY) | |
vapid_email = config.get(ATTR_VAPID_EMAIL) | |
def websocket_appkey(hass, connection, msg): | |
connection.send_message( | |
websocket_api.result_message(msg['id'], vapid_pub_key)) | |
hass.components.websocket_api.async_register_command( | |
WS_TYPE_APPKEY, websocket_appkey, SCHEMA_WS_APPKEY | |
) | |
hass.http.register_view( | |
HTML5PushRegistrationView(registrations, json_path)) | |
hass.http.register_view(HTML5PushCallbackView(registrations)) | |
gcm_api_key = config.get(ATTR_GCM_API_KEY) | |
gcm_sender_id = config.get(ATTR_GCM_SENDER_ID) | |
if gcm_sender_id is not None: | |
add_manifest_json_key( | |
ATTR_GCM_SENDER_ID, config.get(ATTR_GCM_SENDER_ID)) | |
return HTML5NotificationService( | |
hass, gcm_api_key, vapid_prv_key, vapid_email, registrations, | |
json_path) | |
def _load_config(filename): | |
"""Load configuration.""" | |
try: | |
return load_json(filename) | |
except HomeAssistantError: | |
pass | |
return {} | |
class HTML5PushRegistrationView(HomeAssistantView): | |
"""Accepts push registrations from a browser.""" | |
url = '/api/notify.html5' | |
name = 'api:notify.html5' | |
def __init__(self, registrations, json_path): | |
"""Init HTML5PushRegistrationView.""" | |
self.registrations = registrations | |
self.json_path = json_path | |
async def post(self, request): | |
"""Accept the POST request for push registrations from a browser.""" | |
try: | |
data = await request.json() | |
except ValueError: | |
return self.json_message('Invalid JSON', HTTP_BAD_REQUEST) | |
try: | |
data = REGISTER_SCHEMA(data) | |
except vol.Invalid as ex: | |
return self.json_message( | |
humanize_error(data, ex), HTTP_BAD_REQUEST) | |
devname = data.get(ATTR_NAME) | |
data.pop(ATTR_NAME, None) | |
name = self.find_registration_name(data, devname) | |
previous_registration = self.registrations.get(name) | |
self.registrations[name] = data | |
try: | |
hass = request.app['hass'] | |
await hass.async_add_job(save_json, self.json_path, | |
self.registrations) | |
return self.json_message( | |
'Push notification subscriber registered.') | |
except HomeAssistantError: | |
if previous_registration is not None: | |
self.registrations[name] = previous_registration | |
else: | |
self.registrations.pop(name) | |
return self.json_message( | |
'Error saving registration.', HTTP_INTERNAL_SERVER_ERROR) | |
def find_registration_name(self, data, suggested=None): | |
"""Find a registration name matching data or generate a unique one.""" | |
endpoint = data.get(ATTR_SUBSCRIPTION).get(ATTR_ENDPOINT) | |
for key, registration in self.registrations.items(): | |
subscription = registration.get(ATTR_SUBSCRIPTION) | |
if subscription.get(ATTR_ENDPOINT) == endpoint: | |
return key | |
return ensure_unique_string(suggested or 'unnamed device', | |
self.registrations) | |
async def delete(self, request): | |
"""Delete a registration.""" | |
try: | |
data = await request.json() | |
except ValueError: | |
return self.json_message('Invalid JSON', HTTP_BAD_REQUEST) | |
subscription = data.get(ATTR_SUBSCRIPTION) | |
found = None | |
for key, registration in self.registrations.items(): | |
if registration.get(ATTR_SUBSCRIPTION) == subscription: | |
found = key | |
break | |
if not found: | |
# If not found, unregistering was already done. Return 200 | |
return self.json_message('Registration not found.') | |
reg = self.registrations.pop(found) | |
try: | |
hass = request.app['hass'] | |
await hass.async_add_job(save_json, self.json_path, | |
self.registrations) | |
except HomeAssistantError: | |
self.registrations[found] = reg | |
return self.json_message( | |
'Error saving registration.', HTTP_INTERNAL_SERVER_ERROR) | |
return self.json_message('Push notification subscriber unregistered.') | |
class HTML5PushCallbackView(HomeAssistantView): | |
"""Accepts push registrations from a browser.""" | |
requires_auth = False | |
url = '/api/notify.html5/callback' | |
name = 'api:notify.html5/callback' | |
def __init__(self, registrations): | |
"""Init HTML5PushCallbackView.""" | |
self.registrations = registrations | |
def decode_jwt(self, token): | |
"""Find the registration that signed this JWT and return it.""" | |
import jwt | |
# 1. Check claims w/o verifying to see if a target is in there. | |
# 2. If target in claims, attempt to verify against the given name. | |
# 2a. If decode is successful, return the payload. | |
# 2b. If decode is unsuccessful, return a 401. | |
target_check = jwt.decode(token, verify=False) | |
if target_check.get(ATTR_TARGET) in self.registrations: | |
possible_target = self.registrations[target_check[ATTR_TARGET]] | |
key = possible_target[ATTR_SUBSCRIPTION][ATTR_KEYS][ATTR_AUTH] | |
try: | |
return jwt.decode(token, key, algorithms=["ES256", "HS256"]) | |
except jwt.exceptions.DecodeError: | |
pass | |
return self.json_message('No target found in JWT', | |
status_code=HTTP_UNAUTHORIZED) | |
# The following is based on code from Auth0 | |
# https://auth0.com/docs/quickstart/backend/python | |
def check_authorization_header(self, request): | |
"""Check the authorization header.""" | |
import jwt | |
auth = request.headers.get(AUTHORIZATION, None) | |
if not auth: | |
return self.json_message('Authorization header is expected', | |
status_code=HTTP_UNAUTHORIZED) | |
parts = auth.split() | |
if parts[0].lower() != 'bearer': | |
return self.json_message('Authorization header must ' | |
'start with Bearer', | |
status_code=HTTP_UNAUTHORIZED) | |
if len(parts) != 2: | |
return self.json_message('Authorization header must ' | |
'be Bearer token', | |
status_code=HTTP_UNAUTHORIZED) | |
token = parts[1] | |
try: | |
payload = self.decode_jwt(token) | |
except jwt.exceptions.InvalidTokenError: | |
return self.json_message('token is invalid', | |
status_code=HTTP_UNAUTHORIZED) | |
return payload | |
async def post(self, request): | |
"""Accept the POST request for push registrations event callback.""" | |
auth_check = self.check_authorization_header(request) | |
if not isinstance(auth_check, dict): | |
return auth_check | |
try: | |
data = await request.json() | |
except ValueError: | |
return self.json_message('Invalid JSON', HTTP_BAD_REQUEST) | |
event_payload = { | |
ATTR_TAG: data.get(ATTR_TAG), | |
ATTR_TYPE: data[ATTR_TYPE], | |
ATTR_TARGET: auth_check[ATTR_TARGET], | |
} | |
if data.get(ATTR_ACTION) is not None: | |
event_payload[ATTR_ACTION] = data.get(ATTR_ACTION) | |
if data.get(ATTR_DATA) is not None: | |
event_payload[ATTR_DATA] = data.get(ATTR_DATA) | |
try: | |
event_payload = CALLBACK_EVENT_PAYLOAD_SCHEMA(event_payload) | |
except vol.Invalid as ex: | |
_LOGGER.warning("Callback event payload is not valid: %s", | |
humanize_error(event_payload, ex)) | |
event_name = '{}.{}'.format(NOTIFY_CALLBACK_EVENT, | |
event_payload[ATTR_TYPE]) | |
request.app['hass'].bus.fire(event_name, event_payload) | |
return self.json({'status': 'ok', 'event': event_payload[ATTR_TYPE]}) | |
class HTML5NotificationService(BaseNotificationService): | |
"""Implement the notification service for HTML5.""" | |
def __init__(self, hass, gcm_key, vapid_prv, vapid_email, registrations, | |
json_path): | |
"""Initialize the service.""" | |
self._gcm_key = gcm_key | |
self._vapid_prv = vapid_prv | |
self._vapid_claims = {"sub": "mailto:{}".format(vapid_email)} | |
self.registrations = registrations | |
self.registrations_json_path = json_path | |
async def async_dismiss_message(service): | |
"""Handle dismissing notification message service calls.""" | |
kwargs = {} | |
if self.targets is not None: | |
kwargs[ATTR_TARGET] = self.targets | |
elif service.data.get(ATTR_TARGET) is not None: | |
kwargs[ATTR_TARGET] = service.data.get(ATTR_TARGET) | |
kwargs[ATTR_DATA] = service.data.get(ATTR_DATA) | |
await self.async_dismiss(**kwargs) | |
hass.services.async_register( | |
DOMAIN, SERVICE_DISMISS, async_dismiss_message, | |
schema=DISMISS_SERVICE_SCHEMA) | |
@property | |
def targets(self): | |
"""Return a dictionary of registered targets.""" | |
targets = {} | |
for registration in self.registrations: | |
targets[registration] = registration | |
return targets | |
def dismiss(self, **kwargs): | |
"""Dismisses a notification.""" | |
data = kwargs.get(ATTR_DATA) | |
tag = data.get(ATTR_TAG) if data else "" | |
payload = { | |
ATTR_TAG: tag, | |
ATTR_DISMISS: True, | |
ATTR_DATA: {} | |
} | |
self._push_message(payload, **kwargs) | |
async def async_dismiss(self, **kwargs): | |
"""Dismisses a notification. | |
This method must be run in the event loop. | |
""" | |
await self.hass.async_add_executor_job( | |
partial(self.dismiss, **kwargs)) | |
def send_message(self, message="", **kwargs): | |
"""Send a message to a user.""" | |
tag = str(uuid.uuid4()) | |
payload = { | |
'badge': '/static/images/notification-badge.png', | |
'body': message, | |
ATTR_DATA: {}, | |
'icon': '/static/icons/favicon-192x192.png', | |
ATTR_TAG: tag, | |
ATTR_TITLE: kwargs.get(ATTR_TITLE, ATTR_TITLE_DEFAULT) | |
} | |
data = kwargs.get(ATTR_DATA) | |
if data: | |
# Pick out fields that should go into the notification directly vs | |
# into the notification data dictionary. | |
data_tmp = {} | |
for key, val in data.items(): | |
if key in HTML5_SHOWNOTIFICATION_PARAMETERS: | |
payload[key] = val | |
else: | |
data_tmp[key] = val | |
payload[ATTR_DATA] = data_tmp | |
if (payload[ATTR_DATA].get(ATTR_URL) is None and | |
payload.get(ATTR_ACTIONS) is None): | |
payload[ATTR_DATA][ATTR_URL] = URL_ROOT | |
self._push_message(payload, **kwargs) | |
def _push_message(self, payload, **kwargs): | |
"""Send the message.""" | |
import jwt | |
from pywebpush import WebPusher, webpush | |
timestamp = int(time.time()) | |
payload['timestamp'] = (timestamp*1000) # Javascript ms since epoch | |
targets = kwargs.get(ATTR_TARGET) | |
if not targets: | |
targets = self.registrations.keys() | |
for target in list(targets): | |
info = self.registrations.get(target) | |
if info is None: | |
_LOGGER.error("%s is not a valid HTML5 push notification" | |
" target", target) | |
continue | |
jwt_exp = (datetime.datetime.fromtimestamp(timestamp) + | |
datetime.timedelta(hours=JWT_VALID_DAYS)) | |
jwt_secret = info[ATTR_SUBSCRIPTION][ATTR_KEYS][ATTR_AUTH] | |
jwt_claims = {'exp': jwt_exp, 'nbf': timestamp, | |
'iat': timestamp, ATTR_TARGET: target, | |
ATTR_TAG: payload[ATTR_TAG]} | |
jwt_token = jwt.encode(jwt_claims, jwt_secret).decode('utf-8') | |
payload[ATTR_DATA][ATTR_JWT] = jwt_token | |
extra_keys = { | |
'webpush': { | |
'headers': { | |
'Urgency': 'high', | |
'ttl': 86400 | |
} | |
} | |
} | |
payload.update(extra_keys) | |
if self._vapid_prv and self._vapid_claims: | |
response = webpush( | |
info[ATTR_SUBSCRIPTION], | |
json.dumps(payload), | |
vapid_private_key=self._vapid_prv, | |
ttl=86400, | |
vapid_claims=self._vapid_claims | |
) | |
else: | |
# Only pass the gcm key if we're actually using GCM | |
# If we don't, notifications break on FireFox | |
gcm_key = self._gcm_key \ | |
if 'googleapis.com' \ | |
in info[ATTR_SUBSCRIPTION][ATTR_ENDPOINT] \ | |
else None | |
response = WebPusher(info[ATTR_SUBSCRIPTION]).send( | |
json.dumps(payload), gcm_key=gcm_key, ttl='86400' | |
) | |
if response.status_code == 410: | |
_LOGGER.info("Notification channel has expired") | |
reg = self.registrations.pop(target) | |
if not save_json(self.registrations_json_path, | |
self.registrations): | |
self.registrations[target] = reg | |
_LOGGER.error("Error saving registration") | |
else: | |
_LOGGER.info("Configuration saved") |
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