mirror of
https://github.com/jlu5/PyLink.git
synced 2024-11-24 03:29:28 +01:00
610 lines
26 KiB
Python
610 lines
26 KiB
Python
"""
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classes.py - Base classes for PyLink IRC Services.
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This module contains the base classes used by PyLink, including threaded IRC
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connections and objects used to represent IRC servers, users, and channels.
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Here be dragons.
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"""
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import threading
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from random import randint
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import time
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import socket
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import threading
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import ssl
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from collections import defaultdict
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import hashlib
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from copy import deepcopy
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from log import log
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import world
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import utils
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### Exceptions
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class ProtocolError(Exception):
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pass
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### Internal classes (users, servers, channels)
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class Irc():
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"""Base IRC object for PyLink."""
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def __init__(self, netname, proto, conf):
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"""
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Initializes an IRC object. This takes 3 variables: the network name
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(a string), the name of the protocol module to use for this connection,
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and a configuration object.
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"""
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self.name = netname.lower()
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self.conf = conf
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self.serverdata = conf['servers'][netname]
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self.sid = self.serverdata["sid"]
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self.botdata = conf['bot']
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self.protoname = proto.__name__
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self.proto = proto.Class(self)
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self.pingfreq = self.serverdata.get('pingfreq') or 30
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self.pingtimeout = self.pingfreq * 2
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self.connected = threading.Event()
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self.aborted = threading.Event()
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self.initVars()
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if world.testing:
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# HACK: Don't thread if we're running tests.
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self.connect()
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else:
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self.connection_thread = threading.Thread(target = self.connect)
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self.connection_thread.start()
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self.pingTimer = None
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def initVars(self):
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"""
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(Re)sets an IRC object to its default state. This should be called when
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an IRC object is first created, and on every reconnection to a network.
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"""
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self.sid = self.serverdata["sid"]
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self.botdata = self.conf['bot']
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self.pingfreq = self.serverdata.get('pingfreq') or 30
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self.pingtimeout = self.pingfreq * 2
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self.connected.clear()
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self.aborted.clear()
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self.pseudoclient = None
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self.lastping = time.time()
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# Internal variable to set the place the last command was called (in PM
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# or in a channel), used by fantasy command support.
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self.called_by = None
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# Intialize the server, channel, and user indexes to be populated by
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# our protocol module. For the server index, we can add ourselves right
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# now.
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self.servers = {self.sid: IrcServer(None, self.serverdata['hostname'],
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internal=True, desc=self.serverdata.get('serverdesc')
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or self.botdata['serverdesc'])}
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self.users = {}
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self.channels = defaultdict(IrcChannel)
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# This sets the list of supported channel and user modes: the default
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# RFC1459 modes are implied. Named modes are used here to make
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# protocol-independent code easier to write, as mode chars vary by
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# IRCd.
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# Protocol modules should add to and/or replace this with what their
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# protocol supports. This can be a hardcoded list or something
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# negotiated on connect, depending on the nature of their protocol.
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self.cmodes = {'op': 'o', 'secret': 's', 'private': 'p',
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'noextmsg': 'n', 'moderated': 'm', 'inviteonly': 'i',
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'topiclock': 't', 'limit': 'l', 'ban': 'b',
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'voice': 'v', 'key': 'k',
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# This fills in the type of mode each mode character is.
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# A-type modes are list modes (i.e. bans, ban exceptions, etc.),
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# B-type modes require an argument to both set and unset,
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# but there can only be one value at a time
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# (i.e. cmode +k).
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# C-type modes require an argument to set but not to unset
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# (one sets "+l limit" and # "-l"),
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# and D-type modes take no arguments at all.
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'*A': 'b',
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'*B': 'k',
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'*C': 'l',
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'*D': 'imnpstr'}
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self.umodes = {'invisible': 'i', 'snomask': 's', 'wallops': 'w',
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'oper': 'o',
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'*A': '', '*B': '', '*C': 's', '*D': 'iow'}
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# This max nick length starts off as the config value, but may be
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# overwritten later by the protocol module if such information is
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# received. Note that only some IRCds (InspIRCd) give us nick length
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# during link, so it is still required that the config value be set!
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self.maxnicklen = self.serverdata['maxnicklen']
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# Defines a list of supported prefix modes.
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self.prefixmodes = {'o': '@', 'v': '+'}
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# Defines the uplink SID (to be filled in by protocol module).
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self.uplink = None
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self.start_ts = int(time.time())
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def connect(self):
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"""
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Runs the connect loop for the IRC object. This is usually called by
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__init__ in a separate thread to allow multiple concurrent connections.
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"""
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while True:
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self.initVars()
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ip = self.serverdata["ip"]
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port = self.serverdata["port"]
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checks_ok = True
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try:
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# Set the socket type (IPv6 or IPv4).
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stype = socket.AF_INET6 if self.serverdata.get("ipv6") else socket.AF_INET
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# Creat the socket.
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self.socket = socket.socket(stype)
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self.socket.setblocking(0)
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# Set the connection timeouts. Initial connection timeout is a
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# lot smaller than the timeout after we've connected; this is
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# intentional.
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self.socket.settimeout(self.pingfreq)
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# Enable SSL if set to do so. This requires a valid keyfile and
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# certfile to be present.
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self.ssl = self.serverdata.get('ssl')
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if self.ssl:
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log.info('(%s) Attempting SSL for this connection...', self.name)
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certfile = self.serverdata.get('ssl_certfile')
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keyfile = self.serverdata.get('ssl_keyfile')
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if certfile and keyfile:
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try:
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self.socket = ssl.wrap_socket(self.socket,
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certfile=certfile,
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keyfile=keyfile)
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except OSError:
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log.exception('(%s) Caught OSError trying to '
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'initialize the SSL connection; '
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'are "ssl_certfile" and '
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'"ssl_keyfile" set correctly?',
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self.name)
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checks_ok = False
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else: # SSL was misconfigured, abort.
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log.error('(%s) SSL certfile/keyfile was not set '
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'correctly, aborting... ', self.name)
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checks_ok = False
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log.info("Connecting to network %r on %s:%s", self.name, ip, port)
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self.socket.connect((ip, port))
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self.socket.settimeout(self.pingtimeout)
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# If SSL was enabled, optionally verify the certificate
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# fingerprint for some added security. I don't bother to check
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# the entire certificate for validity, since most IRC networks
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# self-sign their certificates anyways.
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if self.ssl and checks_ok:
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peercert = self.socket.getpeercert(binary_form=True)
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sha1fp = hashlib.sha1(peercert).hexdigest()
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expected_fp = self.serverdata.get('ssl_fingerprint')
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if expected_fp:
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if sha1fp != expected_fp:
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# SSL Fingerprint doesn't match; break.
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log.error('(%s) Uplink\'s SSL certificate '
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'fingerprint (SHA1) does not match the '
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'one configured: expected %r, got %r; '
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'disconnecting...', self.name,
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expected_fp, sha1fp)
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checks_ok = False
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else:
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log.info('(%s) Uplink SSL certificate fingerprint '
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'(SHA1) verified: %r', self.name, sha1fp)
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else:
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log.info('(%s) Uplink\'s SSL certificate fingerprint '
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'is %r. You can enhance the security of your '
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'link by specifying this in a "ssl_fingerprint"'
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' option in your server block.', self.name,
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sha1fp)
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if checks_ok:
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# All our checks passed, get the protocol module to connect
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# and run the listen loop.
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self.proto.connect()
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self.spawnMain()
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log.info('(%s) Starting ping schedulers....', self.name)
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self.schedulePing()
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log.info('(%s) Server ready; listening for data.', self.name)
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self.run()
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else: # Configuration error :(
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log.error('(%s) A configuration error was encountered '
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'trying to set up this connection. Please check'
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' your configuration file and try again.',
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self.name)
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except (socket.error, ProtocolError, ConnectionError) as e:
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# self.run() or the protocol module it called raised an
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# exception, meaning we've disconnected!
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log.warning('(%s) Disconnected from IRC: %s: %s',
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self.name, type(e).__name__, str(e))
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# The run() loop above was broken, meaning we've disconnected.
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self._disconnect()
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# If autoconnect is enabled, loop back to the start. Otherwise,
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# return and stop.
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autoconnect = self.serverdata.get('autoconnect')
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log.debug('(%s) Autoconnect delay set to %s seconds.', self.name, autoconnect)
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if autoconnect is not None and autoconnect >= 1:
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log.info('(%s) Going to auto-reconnect in %s seconds.', self.name, autoconnect)
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time.sleep(autoconnect)
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else:
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log.info('(%s) Stopping connect loop (autoconnect value %r is < 1).', self.name, autoconnect)
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return
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def callCommand(self, source, text):
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"""
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Calls a PyLink bot command. source is the caller's UID, and text is the
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full, unparsed text of the message.
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"""
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cmd_args = text.strip().split(' ')
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cmd = cmd_args[0].lower()
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cmd_args = cmd_args[1:]
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if cmd not in world.commands:
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self.msg(self.called_by or source, 'Error: Unknown command %r.' % cmd)
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log.info('(%s) Received unknown command %r from %s', self.name, cmd, utils.getHostmask(self, source))
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return
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log.info('(%s) Calling command %r for %s', self.name, cmd, utils.getHostmask(self, source))
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for func in world.commands[cmd]:
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try:
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func(self, source, cmd_args)
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except utils.NotAuthenticatedError:
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self.msg(self.called_by or source, 'Error: You are not authorized to perform this operation.')
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except Exception as e:
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log.exception('Unhandled exception caught in command %r', cmd)
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self.msg(self.called_by or source, 'Uncaught exception in command %r: %s: %s' % (cmd, type(e).__name__, str(e)))
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def msg(self, target, text, notice=False, source=None):
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"""Handy function to send messages/notices to clients. Source
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is optional, and defaults to the main PyLink client if not specified."""
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source = source or self.pseudoclient.uid
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if notice:
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self.proto.noticeClient(source, target, text)
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cmd = 'PYLINK_SELF_NOTICE'
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else:
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self.proto.messageClient(source, target, text)
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cmd = 'PYLINK_SELF_PRIVMSG'
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self.callHooks([source, cmd, {'target': target, 'text': text}])
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def reply(self, text, notice=False, source=None):
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"""Replies to the last caller in the right context (channel or PM)."""
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self.msg(self.called_by, text, notice=notice, source=source)
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def _disconnect(self):
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"""Handle disconnects from the remote server."""
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log.debug('(%s) Canceling pingTimer at %s due to _disconnect() call', self.name, time.time())
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self.connected.clear()
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try:
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self.socket.close()
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self.pingTimer.cancel()
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except: # Socket timed out during creation; ignore
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pass
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# Internal hook signifying that a network has disconnected.
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self.callHooks([None, 'PYLINK_DISCONNECT', {}])
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def disconnect(self):
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"""Closes the IRC connection."""
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self.aborted.set() # This will cause run() to abort.
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def run(self):
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"""Main IRC loop which listens for messages."""
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# Some magic below cause this to work, though anything that's
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# not encoded in UTF-8 doesn't work very well.
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buf = b""
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data = b""
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while not self.aborted.is_set():
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data = self.socket.recv(2048)
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buf += data
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if self.connected.is_set() and not data:
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log.warning('(%s) No data received and self.connected is set; disconnecting!', self.name)
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return
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elif (time.time() - self.lastping) > self.pingtimeout:
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log.warning('(%s) Connection timed out.', self.name)
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return
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while b'\n' in buf:
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line, buf = buf.split(b'\n', 1)
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line = line.strip(b'\r')
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# FIXME: respect other encodings?
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line = line.decode("utf-8", "replace")
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self.runline(line)
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def runline(self, line):
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"""Sends a command to the protocol module."""
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log.debug("(%s) <- %s", self.name, line)
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try:
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hook_args = self.proto.handle_events(line)
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except Exception:
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log.exception('(%s) Caught error in handle_events, disconnecting!', self.name)
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log.error('(%s) The offending line was: <- %s', self.name, line)
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self.aborted.set()
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return
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# Only call our hooks if there's data to process. Handlers that support
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# hooks will return a dict of parsed arguments, which can be passed on
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# to plugins and the like. For example, the JOIN handler will return
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# something like: {'channel': '#whatever', 'users': ['UID1', 'UID2',
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# 'UID3']}, etc.
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if hook_args is not None:
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self.callHooks(hook_args)
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return hook_args
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def callHooks(self, hook_args):
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"""Calls a hook function with the given hook args."""
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numeric, command, parsed_args = hook_args
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# Always make sure TS is sent.
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if 'ts' not in parsed_args:
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parsed_args['ts'] = int(time.time())
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hook_cmd = command
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hook_map = self.proto.hook_map
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# Handlers can return a 'parse_as' key to send their payload to a
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# different hook. An example of this is "/join 0" being interpreted
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# as leaving all channels (PART).
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if command in hook_map:
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hook_cmd = hook_map[command]
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hook_cmd = parsed_args.get('parse_as') or hook_cmd
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log.debug('(%s) Parsed args %r received from %s handler (calling hook %s)',
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self.name, parsed_args, command, hook_cmd)
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# Iterate over hooked functions, catching errors accordingly
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for hook_func in world.hooks[hook_cmd]:
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try:
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log.debug('(%s) Calling hook function %s from plugin "%s"', self.name,
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hook_func, hook_func.__module__)
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hook_func(self, numeric, command, parsed_args)
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except Exception:
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# We don't want plugins to crash our servers...
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log.exception('(%s) Unhandled exception caught in hook %r from plugin "%s"',
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self.name, hook_func, hook_func.__module__)
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log.error('(%s) The offending hook data was: %s', self.name,
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hook_args)
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continue
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def send(self, data):
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"""Sends raw text to the uplink server."""
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# Safeguard against newlines in input!! Otherwise, each line gets
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# treated as a separate command, which is particularly nasty.
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data = data.replace('\n', ' ')
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data = data.encode("utf-8") + b"\n"
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stripped_data = data.decode("utf-8").strip("\n")
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log.debug("(%s) -> %s", self.name, stripped_data)
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try:
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self.socket.send(data)
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except (OSError, AttributeError):
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log.debug("(%s) Dropping message %r; network isn't connected!", self.name, stripped_data)
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def schedulePing(self):
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"""Schedules periodic pings in a loop."""
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self.proto.pingServer()
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self.pingTimer = threading.Timer(self.pingfreq, self.schedulePing)
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self.pingTimer.daemon = True
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self.pingTimer.start()
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log.debug('(%s) Ping scheduled at %s', self.name, time.time())
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def spawnMain(self):
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"""Spawns the main PyLink client."""
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nick = self.botdata.get('nick') or 'PyLink'
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ident = self.botdata.get('ident') or 'pylink'
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host = self.serverdata["hostname"]
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log.info('(%s) Connected! Spawning main client %s.', self.name, nick)
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olduserobj = self.pseudoclient
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self.pseudoclient = self.proto.spawnClient(nick, ident, host,
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modes={("+o", None)},
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manipulatable=True)
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for chan in self.serverdata['channels']:
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self.proto.joinClient(self.pseudoclient.uid, chan)
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# PyLink internal hook called when spawnMain is called and the
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# contents of Irc().pseudoclient change.
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self.callHooks([self.sid, 'PYLINK_SPAWNMAIN', {'olduser': olduserobj}])
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def __repr__(self):
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return "<classes.Irc object for %r>" % self.name
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class IrcUser():
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"""PyLink IRC user class."""
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def __init__(self, nick, ts, uid, ident='null', host='null',
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realname='PyLink dummy client', realhost='null',
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ip='0.0.0.0', manipulatable=False):
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self.nick = nick
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self.ts = ts
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self.uid = uid
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self.ident = ident
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self.host = host
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self.realhost = realhost
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self.ip = ip
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self.realname = realname
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self.modes = set()
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self.identified = False
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self.channels = set()
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self.away = ''
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# This sets whether the client should be marked as manipulatable.
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# Plugins like bots.py's commands should take caution against
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# manipulating these "protected" clients, to prevent desyncs and such.
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# For "serious" service clients, this should always be False.
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self.manipulatable = manipulatable
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def __repr__(self):
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return repr(self.__dict__)
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class IrcServer():
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"""PyLink IRC server class.
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uplink: The SID of this IrcServer instance's uplink. This is set to None
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for the main PyLink PseudoServer!
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name: The name of the server.
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internal: Whether the server is an internal PyLink PseudoServer.
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"""
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def __init__(self, uplink, name, internal=False, desc="(None given)"):
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self.uplink = uplink
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self.users = set()
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self.internal = internal
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self.name = name.lower()
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self.desc = desc
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def __repr__(self):
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return repr(self.__dict__)
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class IrcChannel():
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"""PyLink IRC channel class."""
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def __init__(self):
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# Initialize variables, such as the topic, user list, TS, who's opped, etc.
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self.users = set()
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self.modes = {('n', None), ('t', None)}
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self.topic = ''
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self.ts = int(time.time())
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self.prefixmodes = {'ops': set(), 'halfops': set(), 'voices': set(),
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'owners': set(), 'admins': set()}
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# Determines whether a topic has been set here or not. Protocol modules
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# should set this.
|
|
self.topicset = False
|
|
|
|
def __repr__(self):
|
|
return repr(self.__dict__)
|
|
|
|
def removeuser(self, target):
|
|
"""Removes a user from a channel."""
|
|
for s in self.prefixmodes.values():
|
|
s.discard(target)
|
|
self.users.discard(target)
|
|
|
|
def deepcopy(self):
|
|
"""Returns a deep copy of the channel object."""
|
|
return deepcopy(self)
|
|
|
|
### FakeIRC classes, used for test cases
|
|
|
|
class FakeIRC(Irc):
|
|
"""Fake IRC object used for unit tests."""
|
|
def connect(self):
|
|
self.messages = []
|
|
self.hookargs = []
|
|
self.hookmsgs = []
|
|
self.socket = None
|
|
self.initVars()
|
|
self.spawnMain()
|
|
self.connected = threading.Event()
|
|
self.connected.set()
|
|
|
|
def run(self, data):
|
|
"""Queues a message to the fake IRC server."""
|
|
log.debug('<- ' + data)
|
|
hook_args = self.proto.handle_events(data)
|
|
if hook_args is not None:
|
|
self.hookmsgs.append(hook_args)
|
|
self.callHooks(hook_args)
|
|
|
|
def send(self, data):
|
|
self.messages.append(data)
|
|
log.debug('-> ' + data)
|
|
|
|
def takeMsgs(self):
|
|
"""Returns a list of messages sent by the protocol module since
|
|
the last takeMsgs() call, so we can track what has been sent."""
|
|
msgs = self.messages
|
|
self.messages = []
|
|
return msgs
|
|
|
|
def takeCommands(self, msgs):
|
|
"""Returns a list of commands parsed from the output of takeMsgs()."""
|
|
sidprefix = ':' + self.sid
|
|
commands = []
|
|
for m in msgs:
|
|
args = m.split()
|
|
if m.startswith(sidprefix):
|
|
commands.append(args[1])
|
|
else:
|
|
commands.append(args[0])
|
|
return commands
|
|
|
|
def takeHooks(self):
|
|
"""Returns a list of hook arguments sent by the protocol module since
|
|
the last takeHooks() call."""
|
|
hookmsgs = self.hookmsgs
|
|
self.hookmsgs = []
|
|
return hookmsgs
|
|
|
|
class Protocol():
|
|
# TODO: Future state-keeping things will go here
|
|
def __init__(self, irc):
|
|
self.irc = irc
|
|
self.casemapping = 'rfc1459'
|
|
self.hook_map = {}
|
|
|
|
def parseArgs(self, args):
|
|
"""Parses a string of RFC1459-style arguments split into a list, where ":" may
|
|
be used for multi-word arguments that last until the end of a line.
|
|
"""
|
|
real_args = []
|
|
for idx, arg in enumerate(args):
|
|
real_args.append(arg)
|
|
# If the argument starts with ':' and ISN'T the first argument.
|
|
# The first argument is used for denoting the source UID/SID.
|
|
if arg.startswith(':') and idx != 0:
|
|
# : is used for multi-word arguments that last until the end
|
|
# of the message. We can use list splicing here to turn them all
|
|
# into one argument.
|
|
# Set the last arg to a joined version of the remaining args
|
|
arg = args[idx:]
|
|
arg = ' '.join(arg)[1:]
|
|
# Cut the original argument list right before the multi-word arg,
|
|
# and then append the multi-word arg.
|
|
real_args = args[:idx]
|
|
real_args.append(arg)
|
|
break
|
|
return real_args
|
|
|
|
def removeClient(self, numeric):
|
|
"""Internal function to remove a client from our internal state."""
|
|
for c, v in self.irc.channels.copy().items():
|
|
v.removeuser(numeric)
|
|
# Clear empty non-permanent channels.
|
|
if not (self.irc.channels[c].users or ((self.irc.cmodes.get('permanent'), None) in self.irc.channels[c].modes)):
|
|
del self.irc.channels[c]
|
|
assert numeric not in v.users, "IrcChannel's removeuser() is broken!"
|
|
|
|
sid = numeric[:3]
|
|
log.debug('Removing client %s from self.irc.users', numeric)
|
|
del self.irc.users[numeric]
|
|
log.debug('Removing client %s from self.irc.servers[%s].users', numeric, sid)
|
|
self.irc.servers[sid].users.discard(numeric)
|
|
|
|
def updateTS(self, channel, their_ts):
|
|
our_ts = self.irc.channels[channel].ts
|
|
if their_ts < our_ts:
|
|
# Channel timestamp was reset on burst
|
|
log.debug('(%s) Setting channel TS of %s to %s from %s',
|
|
self.irc.name, channel, their_ts, our_ts)
|
|
self.irc.channels[channel].ts = their_ts
|
|
# When TS is reset, clear all modes we currently have
|
|
self.irc.channels[channel].modes.clear()
|
|
for p in self.irc.channels[channel].prefixmodes.values():
|
|
p.clear()
|
|
|
|
class FakeProto(Protocol):
|
|
"""Dummy protocol module for testing purposes."""
|
|
def handle_events(self, data):
|
|
pass
|
|
|
|
def connect(self):
|
|
pass
|
|
|
|
def spawnClient(self, nick, *args, **kwargs):
|
|
uid = str(randint(1, 10000000000))
|
|
ts = int(time.time())
|
|
self.irc.users[uid] = user = IrcUser(nick, ts, uid)
|
|
return user
|
|
|
|
def joinClient(self, client, channel):
|
|
self.irc.channels[channel].users.add(client)
|
|
self.irc.users[client].channels.add(channel)
|
|
|
|
FakeProto.Class = FakeProto
|