# -*- coding: utf-8 -*- # # Copyright (C) 2021 Chris Caron # All rights reserved. # # This code is licensed under the MIT License. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files(the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and / or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions : # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. # PAHO MQTT Documentation: # https://www.eclipse.org/paho/index.php?page=clients/python/docs/index.php # # Looking at the PAHO MQTT Source can help shed light on what's going on too # as their inline documentation is pretty good! # https://github.com/eclipse/paho.mqtt.python\ # /blob/master/src/paho/mqtt/client.py import ssl import re from time import sleep from datetime import datetime from os.path import isfile from .NotifyBase import NotifyBase from ..URLBase import PrivacyMode from ..common import NotifyType from ..utils import parse_list from ..utils import parse_bool from ..AppriseLocale import gettext_lazy as _ # Default our global support flag NOTIFY_MQTT_SUPPORT_ENABLED = False try: # 3rd party modules import paho.mqtt.client as mqtt # We're good to go! NOTIFY_MQTT_SUPPORT_ENABLED = True MQTT_PROTOCOL_MAP = { # v3.1.1 "311": mqtt.MQTTv311, # v3.1 "31": mqtt.MQTTv31, # v5.0 "5": mqtt.MQTTv5, # v5.0 (alias) "50": mqtt.MQTTv5, } except ImportError: # No problem; we just simply can't support this plugin because we're # either using Linux, or simply do not have pywin32 installed. MQTT_PROTOCOL_MAP = {} # A lookup map for relaying version to user HUMAN_MQTT_PROTOCOL_MAP = { "v3.1.1": "311", "v3.1": "31", "v5.0": "5", } class NotifyMQTT(NotifyBase): """ A wrapper for MQTT Notifications """ # Set our global enabled flag enabled = NOTIFY_MQTT_SUPPORT_ENABLED requirements = { # Define our required packaging in order to work 'packages_required': 'paho-mqtt' } # The default descriptive name associated with the Notification service_name = 'MQTT Notification' # The default protocol protocol = 'mqtt' # Secure protocol secure_protocol = 'mqtts' # A URL that takes you to the setup/help of the specific protocol setup_url = 'https://github.com/caronc/apprise/wiki/Notify_mqtt' # MQTT does not have a title title_maxlen = 0 # The maximum length a body can be set to body_maxlen = 268435455 # Use a throttle; but it doesn't need to be so strict since most # MQTT server hostings can handle the small bursts of packets and are # locally hosted anyway request_rate_per_sec = 0.5 # Port Defaults (unless otherwise specified) mqtt_insecure_port = 1883 # The default secure port to use (if mqtts://) mqtt_secure_port = 8883 # The default mqtt keepalive value mqtt_keepalive = 30 # The default mqtt transport mqtt_transport = "tcp" # The number of seconds to wait for a publish to occur at before # checking to see if it's been sent yet. mqtt_block_time_sec = 0.2 # Set the maximum number of messages with QoS>0 that can be part way # through their network flow at once. mqtt_inflight_messages = 200 # Define object templates templates = ( '{schema}://{user}@{host}/{topic}', '{schema}://{user}@{host}:{port}/{topic}', '{schema}://{user}:{password}@{host}/{topic}', '{schema}://{user}:{password}@{host}:{port}/{topic}', ) template_tokens = dict(NotifyBase.template_tokens, **{ 'host': { 'name': _('Hostname'), 'type': 'string', 'required': True, }, 'port': { 'name': _('Port'), 'type': 'int', 'min': 1, 'max': 65535, }, 'user': { 'name': _('User Name'), 'type': 'string', 'required': True, }, 'password': { 'name': _('Password'), 'type': 'string', 'private': True, 'required': True, }, 'topic': { 'name': _('Target Queue'), 'type': 'string', 'map_to': 'targets', }, 'targets': { 'name': _('Targets'), 'type': 'list:string', }, }) # Define our template arguments template_args = dict(NotifyBase.template_args, **{ 'to': { 'alias_of': 'targets', }, 'qos': { 'name': _('QOS'), 'type': 'int', 'default': 0, 'min': 0, 'max': 2, }, 'version': { 'name': _('Version'), 'type': 'choice:string', 'values': HUMAN_MQTT_PROTOCOL_MAP, 'default': "v3.1.1", }, 'client_id': { 'name': _('Client ID'), 'type': 'string', }, 'session': { 'name': _('Use Session'), 'type': 'bool', 'default': False, }, }) def __init__(self, targets=None, version=None, qos=None, client_id=None, session=None, **kwargs): """ Initialize MQTT Object """ super().__init__(**kwargs) # Initialize topics self.topics = parse_list(targets) if version is None: self.version = self.template_args['version']['default'] else: self.version = version # Save our client id if specified self.client_id = client_id # Maintain our session (associated with our user id if set) self.session = self.template_args['session']['default'] \ if session is None or not self.client_id \ else parse_bool(session) # Set up our Quality of Service (QoS) try: self.qos = self.template_args['qos']['default'] \ if qos is None else int(qos) if self.qos < self.template_args['qos']['min'] \ or self.qos > self.template_args['qos']['max']: # Let error get handle on exceptio higher up raise ValueError("") except (ValueError, TypeError): msg = 'An invalid MQTT QOS ({}) was specified.'.format(qos) self.logger.warning(msg) raise TypeError(msg) if not self.port: # Assign port (if not otherwise set) self.port = self.mqtt_secure_port \ if self.secure else self.mqtt_insecure_port self.ca_certs = None if self.secure: # verify SSL key or abort # TODO: There is no error reporting or aborting here? # It could be useful to inform the user _where_ Apprise # tried to find the root CA certificates file. self.ca_certs = next( (cert for cert in self.CA_CERTIFICATE_FILE_LOCATIONS if isfile(cert)), None) # Set up our MQTT Publisher try: # Get our protocol self.mqtt_protocol = \ MQTT_PROTOCOL_MAP[re.sub(r'[^0-9]+', '', self.version)] except (KeyError): msg = 'An invalid MQTT Protocol version ' \ '({}) was specified.'.format(version) self.logger.warning(msg) raise TypeError(msg) # Our MQTT Client Object self.client = mqtt.Client( client_id=self.client_id, clean_session=not self.session, userdata=None, protocol=self.mqtt_protocol, transport=self.mqtt_transport, ) # Our maximum number of in-flight messages self.client.max_inflight_messages_set(self.mqtt_inflight_messages) # Toggled to False once our connection has been established at least # once self.__initial_connect = True def send(self, body, title='', notify_type=NotifyType.INFO, **kwargs): """ Perform MQTT Notification """ if len(self.topics) == 0: # There were no services to notify self.logger.warning('There were no MQTT topics to notify.') return False # For logging: url = '{host}:{port}'.format(host=self.host, port=self.port) try: if self.__initial_connect: # Our initial connection if self.user: self.client.username_pw_set( self.user, password=self.password) if self.secure: if self.ca_certs is None: self.logger.error( 'MQTT secure communication can not be verified, ' 'CA certificates file missing') return False self.client.tls_set( ca_certs=self.ca_certs, certfile=None, keyfile=None, cert_reqs=ssl.CERT_REQUIRED, tls_version=ssl.PROTOCOL_TLS, ciphers=None) # Set our TLS Verify Flag self.client.tls_insecure_set(self.verify_certificate) # Establish our connection if self.client.connect( self.host, port=self.port, keepalive=self.mqtt_keepalive) \ != mqtt.MQTT_ERR_SUCCESS: self.logger.warning( 'An MQTT connection could not be established for {}'. format(url)) return False # Start our client loop self.client.loop_start() # Throttle our start otherwise the starting handshaking doesnt # work. I'm not sure if this is a bug or not, but with qos=0, # and without this sleep(), the messages randomly fails to be # delivered. sleep(0.01) # Toggle our flag since we never need to enter this area again self.__initial_connect = False # Create a copy of the subreddits list topics = list(self.topics) has_error = False while len(topics) > 0 and not has_error: # Retrieve our subreddit topic = topics.pop() # For logging: url = '{host}:{port}/{topic}'.format( host=self.host, port=self.port, topic=topic) # Always call throttle before any remote server i/o is made self.throttle() # handle a re-connection if not self.client.is_connected() and \ self.client.reconnect() != mqtt.MQTT_ERR_SUCCESS: self.logger.warning( 'An MQTT connection could not be sustained for {}'. format(url)) has_error = True break # Some Debug Logging self.logger.debug('MQTT POST URL: {} (cert_verify={})'.format( url, self.verify_certificate)) self.logger.debug('MQTT Payload: %s' % str(body)) result = self.client.publish( topic, payload=body, qos=self.qos, retain=False) if result.rc != mqtt.MQTT_ERR_SUCCESS: # Toggle our status self.logger.warning( 'An error (rc={}) occured when sending MQTT to {}'. format(result.rc, url)) has_error = True break elif not result.is_published(): self.logger.debug( 'Blocking until MQTT payload is published...') reference = datetime.now() while not has_error and not result.is_published(): # Throttle sleep(self.mqtt_block_time_sec) # Our own throttle so we can abort eventually.... elapsed = (datetime.now() - reference).total_seconds() if elapsed >= self.socket_read_timeout: self.logger.warning( 'The MQTT message could not be delivered') has_error = True # if we reach here; we're at the bottom of our loop # we loop around and do the next topic now except ConnectionError as e: self.logger.warning( 'MQTT Connection Error received from {}'.format(url)) self.logger.debug('Socket Exception: %s' % str(e)) return False except ssl.CertificateError as e: self.logger.warning( 'MQTT SSL Certificate Error received from {}'.format(url)) self.logger.debug('Socket Exception: %s' % str(e)) return False except ValueError as e: # ValueError's are thrown from publish() call if there is a problem self.logger.warning( 'MQTT Publishing error received: from {}'.format(url)) self.logger.debug('Socket Exception: %s' % str(e)) return False return not has_error def url(self, privacy=False, *args, **kwargs): """ Returns the URL built dynamically based on specified arguments. """ # Define any URL parameters params = { 'version': self.version, 'qos': str(self.qos), 'session': 'yes' if self.session else 'no', } if self.client_id: # Our client id is set if specified params['client_id'] = self.client_id # Extend our parameters params.update(self.url_parameters(privacy=privacy, *args, **kwargs)) # Determine Authentication auth = '' if self.user and self.password: auth = '{user}:{password}@'.format( user=NotifyMQTT.quote(self.user, safe=''), password=self.pprint( self.password, privacy, mode=PrivacyMode.Secret, safe=''), ) elif self.user: auth = '{user}@'.format( user=NotifyMQTT.quote(self.user, safe=''), ) default_port = self.mqtt_secure_port \ if self.secure else self.mqtt_insecure_port return '{schema}://{auth}{hostname}{port}/{targets}?{params}'.format( schema=self.secure_protocol if self.secure else self.protocol, auth=auth, # never encode hostname since we're expecting it to be a valid one hostname=self.host, port='' if self.port is None or self.port == default_port else ':{}'.format(self.port), targets=','.join( [NotifyMQTT.quote(x, safe='/') for x in self.topics]), params=NotifyMQTT.urlencode(params), ) @staticmethod def parse_url(url): """ There are no parameters nessisary for this protocol; simply having windows:// is all you need. This function just makes sure that is in place. """ results = NotifyBase.parse_url(url) if not results: # We're done early as we couldn't load the results return results try: # Acquire topic(s) results['targets'] = parse_list( NotifyMQTT.unquote(results['fullpath'].lstrip('/'))) except AttributeError: # No 'fullpath' specified results['targets'] = [] # The MQTT protocol version to use if 'version' in results['qsd'] and len(results['qsd']['version']): results['version'] = \ NotifyMQTT.unquote(results['qsd']['version']) # The MQTT Client ID if 'client_id' in results['qsd'] and len(results['qsd']['client_id']): results['client_id'] = \ NotifyMQTT.unquote(results['qsd']['client_id']) if 'session' in results['qsd'] and len(results['qsd']['session']): results['session'] = parse_bool(results['qsd']['session']) # The MQTT Quality of Service to use if 'qos' in results['qsd'] and len(results['qsd']['qos']): results['qos'] = \ NotifyMQTT.unquote(results['qsd']['qos']) # The 'to' makes it easier to use yaml configuration if 'to' in results['qsd'] and len(results['qsd']['to']): results['targets'].extend( NotifyMQTT.parse_list(results['qsd']['to'])) # return results return results @property def CA_CERTIFICATE_FILE_LOCATIONS(self): """ Return possible locations to root certificate authority (CA) bundles. Taken from https://golang.org/src/crypto/x509/root_linux.go TODO: Maybe refactor to a general utility function? """ candidates = [ # Debian/Ubuntu/Gentoo etc. "/etc/ssl/certs/ca-certificates.crt", # Fedora/RHEL 6 "/etc/pki/tls/certs/ca-bundle.crt", # OpenSUSE "/etc/ssl/ca-bundle.pem", # OpenELEC "/etc/pki/tls/cacert.pem", # CentOS/RHEL 7 "/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem", # macOS Homebrew; brew install ca-certificates "/usr/local/etc/ca-certificates/cert.pem", ] # Certifi provides Mozilla’s carefully curated collection of Root # Certificates for validating the trustworthiness of SSL certificates # while verifying the identity of TLS hosts. It has been extracted from # the Requests project. try: import certifi candidates.append(certifi.where()) except ImportError: # pragma: no cover pass return candidates