1 # -*- coding: utf-8 -*-
2 # SPDX-FileCopyrightText: 2023 kaliko <kaliko@azylum.org>
3 # SPDX-License-Identifier: GPL-3.0-or-later
4 """A Real Time Block List plugin"""
6 from hashlib import sha256
7 from typing import Dict, Optional
9 from slixmpp import JID
10 from slixmpp.exceptions import XMPPError
11 from slixmpp.xmlstream import tostring
13 from .plugin import Plugin, botcmd
16 def jid_to_sha256(jid: JID) -> str:
17 """Convert Bare JID to sha256 hexdigest"""
18 return sha256(jid.bare.encode('utf-8')).hexdigest()
22 """Plain object to keep track of block list items.
23 Only used in RTBL plugin."""
24 #: Initial seed to ease testing
27 def __init__(self, initial_bl):
28 self.sha256_jids: Dict[str, Optional[str]] = dict(BL.init)
29 for item in initial_bl:
30 self.insert_item(item)
32 def check(self, jid: JID) -> bool:
33 """Check the presence of the JID in the blocklist"""
34 jidhash = jid_to_sha256(jid)
35 return jidhash in self.sha256_jids
37 def retract_item(self, item):
39 self.sha256_jids.pop(item[id], None)
41 def insert_item(self, item):
44 for i in item['payload']:
48 except AttributeError:
50 self.sha256_jids[item['id']] = text
52 def get_reason(self, jid: JID) -> Optional[str]:
53 """Check the presence of the JID in the blocklist"""
54 jidhash = jid_to_sha256(jid)
55 return self.sha256_jids[jidhash]
58 """Implement the built-in function len(), use for boolean evaluation"""
59 return len(self.sha256_jids)
63 """Spam guard plugin for MUC.
66 pubsub_server = 'example.org'
67 #: Pubsub server node to subscribe to
68 node = 'muc_bans_sha256'
70 def __init__(self, bot):
71 Plugin.__init__(self, bot)
72 bot.register_plugin('xep_0059') # Result Set Management
73 bot.register_plugin('xep_0060') # Publish-Subscribe
75 ('session_start', self._subscribe),
76 ('pubsub_retract', self._retract),
77 ('pubsub_publish', self._publish),
78 (f'muc::{self.bot.room}::presence', self.got_presence),
79 (f'muc::{self.bot.room}::got_online', self.got_online)
83 self.moderator = False
84 self.blocklist: BL = None
86 self.presences = bot.muc_presences
90 self.bot.unregister_bot_plugin(self)
92 async def _subscribe(self, *args):
94 nodes = await self.bot['xep_0060'].get_nodes(self.pubsub_server)
95 nodes_av = [_.get('node') for _ in nodes['disco_items']]
96 self.log.debug(f'nodes available: {nodes_av}')
97 if self.node not in nodes_av:
98 self.log.error(f'{self.node} node not available on {self.pubsub_server}')
100 iq = await self.bot['xep_0060'].subscribe(self.pubsub_server, self.node)
101 subscription = iq['pubsub']['subscription']
102 self.log.info('Subscribed %s to node %s', subscription['jid'], subscription['node'])
103 except XMPPError as error:
104 self.log.error('Could not subscribe %s to node %s: %s',
105 self.bot.boundjid.full, self.node, error.format())
108 node_blocklist = await self.bot['xep_0060'].get_items(self.pubsub_server, self.node)
109 self.blocklist = BL(node_blocklist['pubsub']['items'])
110 mess = f'Got {len(self.blocklist)} items in block list'
112 # Are current participants in the block list
113 for jid in [pres['muc']['jid'] for pres in self.presences.values()]:
114 await self.rtbl_ban(jid)
116 async def _create(self):
117 """Try to create node"""
119 await self.bot['xep_0060'].create_node(self.pubsub_server, self.node)
120 self.log.info('Created node %s', self.node)
121 except XMPPError as err:
122 self.log.error('Could not create node %s: %s', self.node, err.format())
123 raise XMPPError(f'Could not create node {self.node}') from err
125 def _retract(self, msg):
126 """Handler receiving a retract item event."""
127 self.log.debug('Retracted item %s from %s' % (
128 msg['pubsub_event']['items']['retract']['id'],
129 msg['pubsub_event']['items']['node']))
130 self.blocklist.retract_item(msg['pubsub_event']['items']['retract'])
132 async def _publish(self, msg):
133 """Handler receiving a publish item event."""
134 self.log.debug('Published item %s to %s:' % (
135 msg['pubsub_event']['items']['item']['id'],
136 msg['pubsub_event']['items']['node']))
137 data = msg['pubsub_event']['items']['item']['payload']
139 self.log.debug(tostring(data))
141 self.log.debug('No item content')
143 self.blocklist.insert_item(msg['pubsub_event']['items']['item'])
144 # Are current participants in the block list
145 for jid in [pres['muc']['jid'] for pres in self.presences.values()]:
146 await self.rtbl_ban(jid)
148 async def rtbl_ban(self, jid: JID):
149 """Ban jid in RTBL"""
150 if not self.moderator or not jid.bare:
152 if self.blocklist is None:
153 self.log.info('Not checking %s, block list not populated yet', jid)
155 if self.blocklist.check(jid):
156 self.log.debug(f'About to ban {jid}')
157 reason = self.blocklist.get_reason(jid)
158 if reason is not None:
159 reason = f'rtbl {reason}'
160 await self.ban(jid.bare, reason=reason)
162 self.log.info(f'{jid} banned!')
164 def got_presence(self, pres):
165 """Does bot have required permissions"""
166 if 110 in pres['muc']['status_codes']:
167 if pres['muc']['role'] != 'moderator':
169 'Please give the bot moderator permissions. Will only log actions.'
171 self.moderator = False
174 self.log.info('Got moderator permissions.')
175 self.moderator = True
176 #TODO: purge presences cache sid.MUCBot.muc_presences?
178 async def got_online(self, pres):
179 """Handler method for new MUC participants"""
180 fjid = pres['muc']['jid']
181 await self.rtbl_ban(fjid)
183 @botcmd(name="rtbl-info")
184 def rtbl_info(self, rcv, _):
186 if self.blocklist is None:
187 msg = 'Block list not populated yet'
188 self.log.warning(msg)
191 msg = f'Got {len(self.blocklist)} items in {RTBL.pubsub_server}/{RTBL.node}'
193 msg+=f' (hits {self.hits})'
194 if not self.moderator:
195 msg+='\nBot has no moderator permissions!'
199 if __name__ == '__main__':
200 from .cli.rtbl import main
204 # vim: ai ts=4 sw=4 sts=4 expandtab