mirror of
https://github.com/jlu5/PyLink.git
synced 2024-12-25 04:02:45 +01:00
565 lines
23 KiB
Python
565 lines
23 KiB
Python
"""
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utils.py - PyLink utilities module.
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This module contains various utility functions related to IRC and/or the PyLink
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framework.
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"""
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import string
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import re
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import inspect
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import importlib
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import os
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from log import log
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import world
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import conf
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class NotAuthenticatedError(Exception):
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"""
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Exception raised by checkAuthenticated() when a user fails authentication
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requirements.
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"""
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pass
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class TS6UIDGenerator():
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"""
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TS6 UID Generator module, adapted from InspIRCd source:
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https://github.com/inspircd/inspircd/blob/f449c6b296ab/src/server.cpp#L85-L156
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"""
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def __init__(self, sid):
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# TS6 UIDs are 6 characters in length (9 including the SID).
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# They wrap from ABCDEFGHIJKLMNOPQRSTUVWXYZ -> 0123456789 -> wrap around:
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# (e.g. AAAAAA, AAAAAB ..., AAAAA8, AAAAA9, AAAABA)
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self.allowedchars = string.ascii_uppercase + string.digits
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self.uidchars = [self.allowedchars[0]]*6
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self.sid = sid
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def increment(self, pos=5):
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"""
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Increments the SID generator to the next available SID.
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"""
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# If we're at the last character in the list of allowed ones, reset
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# and increment the next level above.
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if self.uidchars[pos] == self.allowedchars[-1]:
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self.uidchars[pos] = self.allowedchars[0]
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self.increment(pos-1)
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else:
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# Find what position in the allowed characters list we're currently
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# on, and add one.
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idx = self.allowedchars.find(self.uidchars[pos])
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self.uidchars[pos] = self.allowedchars[idx+1]
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def next_uid(self):
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"""
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Returns the next unused TS6 UID for the server.
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"""
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uid = self.sid + ''.join(self.uidchars)
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self.increment()
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return uid
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class TS6SIDGenerator():
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"""
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TS6 SID Generator. <query> is a 3 character string with any combination of
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uppercase letters, digits, and #'s. it must contain at least one #,
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which are used by the generator as a wildcard. On every next_sid() call,
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the first available wildcard character (from the right) will be
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incremented to generate the next SID.
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When there are no more available SIDs left (SIDs are not reused, only
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incremented), RuntimeError is raised.
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Example queries:
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"1#A" would give: 10A, 11A, 12A ... 19A, 1AA, 1BA ... 1ZA (36 total results)
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"#BQ" would give: 0BQ, 1BQ, 2BQ ... 9BQ (10 total results)
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"6##" would give: 600, 601, 602, ... 60Y, 60Z, 610, 611, ... 6ZZ (1296 total results)
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"""
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def __init__(self, irc):
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self.irc = irc
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try:
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self.query = query = list(irc.serverdata["sidrange"])
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except KeyError:
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raise RuntimeError('(%s) "sidrange" is missing from your server configuration block!' % irc.name)
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self.iters = self.query.copy()
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self.output = self.query.copy()
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self.allowedchars = {}
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qlen = len(query)
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assert qlen == 3, 'Incorrect length for a SID (must be 3, got %s)' % qlen
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assert '#' in query, "Must be at least one wildcard (#) in query"
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for idx, char in enumerate(query):
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# Iterate over each character in the query string we got, along
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# with its index in the string.
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assert char in (string.digits+string.ascii_uppercase+"#"), \
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"Invalid character %r found." % char
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if char == '#':
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if idx == 0: # The first char be only digits
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self.allowedchars[idx] = string.digits
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else:
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self.allowedchars[idx] = string.digits+string.ascii_uppercase
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self.iters[idx] = iter(self.allowedchars[idx])
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self.output[idx] = self.allowedchars[idx][0]
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next(self.iters[idx])
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def increment(self, pos=2):
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"""
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Increments the SID generator to the next available SID.
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"""
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if pos < 0:
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# Oh no, we've wrapped back to the start!
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raise RuntimeError('No more available SIDs!')
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it = self.iters[pos]
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try:
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self.output[pos] = next(it)
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except TypeError: # This position is not an iterator, but a string.
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self.increment(pos-1)
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except StopIteration:
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self.output[pos] = self.allowedchars[pos][0]
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self.iters[pos] = iter(self.allowedchars[pos])
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next(self.iters[pos])
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self.increment(pos-1)
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def next_sid(self):
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"""
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Returns the next unused TS6 SID for the server.
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"""
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while ''.join(self.output) in self.irc.servers:
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# Increment until the SID we have doesn't already exist.
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self.increment()
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sid = ''.join(self.output)
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return sid
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def add_cmd(func, name=None):
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"""Binds an IRC command function to the given command name."""
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if name is None:
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name = func.__name__
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name = name.lower()
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world.commands[name].append(func)
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return func
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def add_hook(func, command):
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"""Binds a hook function to the given command name."""
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command = command.upper()
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world.hooks[command].append(func)
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return func
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def toLower(irc, text):
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"""Returns a lowercase representation of text based on the IRC object's
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casemapping (rfc1459 or ascii)."""
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if irc.proto.casemapping == 'rfc1459':
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text = text.replace('{', '[')
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text = text.replace('}', ']')
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text = text.replace('|', '\\')
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text = text.replace('~', '^')
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return text.lower()
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def nickToUid(irc, nick):
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"""Returns the UID of a user named nick, if present."""
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nick = toLower(irc, nick)
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for k, v in irc.users.copy().items():
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if toLower(irc, v.nick) == nick:
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return k
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def clientToServer(irc, numeric):
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"""Finds the SID of the server a user is on."""
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for server in irc.servers:
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if numeric in irc.servers[server].users:
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return server
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_nickregex = r'^[A-Za-z\|\\_\[\]\{\}\^\`][A-Z0-9a-z\-\|\\_\[\]\{\}\^\`]*$'
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def isNick(s, nicklen=None):
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"""Returns whether the string given is a valid nick."""
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if nicklen and len(s) > nicklen:
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return False
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return bool(re.match(_nickregex, s))
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def isChannel(s):
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"""Returns whether the string given is a valid channel name."""
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return str(s).startswith('#')
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def _isASCII(s):
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"""Returns whether the string given is valid ASCII."""
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chars = string.ascii_letters + string.digits + string.punctuation
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return all(char in chars for char in s)
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def isServerName(s):
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"""Returns whether the string given is a valid IRC server name."""
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return _isASCII(s) and '.' in s and not s.startswith('.')
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hostmaskRe = re.compile(r'^\S+!\S+@\S+$')
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def isHostmask(text):
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"""Returns whether the given text is a valid hostmask."""
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# Band-aid patch here to prevent bad bans set by Janus forwarding people into invalid channels.
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return hostmaskRe.match(text) and '#' not in text
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def parseModes(irc, target, args):
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"""Parses a modestring list into a list of (mode, argument) tuples.
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['+mitl-o', '3', 'person'] => [('+m', None), ('+i', None), ('+t', None), ('+l', '3'), ('-o', 'person')]
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"""
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# http://www.irc.org/tech_docs/005.html
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# A = Mode that adds or removes a nick or address to a list. Always has a parameter.
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# B = Mode that changes a setting and always has a parameter.
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# C = Mode that changes a setting and only has a parameter when set.
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# D = Mode that changes a setting and never has a parameter.
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assert args, 'No valid modes were supplied!'
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usermodes = not isChannel(target)
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prefix = ''
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modestring = args[0]
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args = args[1:]
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if usermodes:
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log.debug('(%s) Using irc.umodes for this query: %s', irc.name, irc.umodes)
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assert target in irc.users, "Unknown user %r." % target
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supported_modes = irc.umodes
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oldmodes = irc.users[target].modes
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else:
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log.debug('(%s) Using irc.cmodes for this query: %s', irc.name, irc.cmodes)
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assert target in irc.channels, "Unknown channel %r." % target
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supported_modes = irc.cmodes
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oldmodes = irc.channels[target].modes
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res = []
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for mode in modestring:
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if mode in '+-':
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prefix = mode
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else:
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if not prefix:
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prefix = '+'
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arg = None
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log.debug('Current mode: %s%s; args left: %s', prefix, mode, args)
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try:
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if mode in (supported_modes['*A'] + supported_modes['*B']):
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# Must have parameter.
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log.debug('Mode %s: This mode must have parameter.', mode)
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arg = args.pop(0)
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if prefix == '-' and mode in supported_modes['*B'] and arg == '*':
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# Charybdis allows unsetting +k without actually
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# knowing the key by faking the argument when unsetting
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# as a single "*".
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# We'd need to know the real argument of +k for us to
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# be able to unset the mode.
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oldargs = [m[1] for m in oldmodes if m[0] == mode]
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if oldargs:
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# Set the arg to the old one on the channel.
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arg = oldargs[0]
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log.debug("Mode %s: coersing argument of '*' to %r.", mode, arg)
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elif mode in irc.prefixmodes and not usermodes:
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# We're setting a prefix mode on someone (e.g. +o user1)
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log.debug('Mode %s: This mode is a prefix mode.', mode)
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arg = args.pop(0)
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# Convert nicks to UIDs implicitly; most IRCds will want
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# this already.
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arg = nickToUid(irc, arg) or arg
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if arg not in irc.users: # Target doesn't exist, skip it.
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log.debug('(%s) Skipping setting mode "%s %s"; the '
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'target doesn\'t seem to exist!', irc.name,
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mode, arg)
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continue
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elif prefix == '+' and mode in supported_modes['*C']:
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# Only has parameter when setting.
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log.debug('Mode %s: Only has parameter when setting.', mode)
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arg = args.pop(0)
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except IndexError:
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log.warning('(%s/%s) Error while parsing mode %r: mode requires an '
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'argument but none was found. (modestring: %r)',
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irc.name, target, mode, modestring)
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continue # Skip this mode; don't error out completely.
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res.append((prefix + mode, arg))
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return res
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def applyModes(irc, target, changedmodes):
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"""Takes a list of parsed IRC modes, and applies them on the given target.
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The target can be either a channel or a user; this is handled automatically."""
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usermodes = not isChannel(target)
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log.debug('(%s) Using usermodes for this query? %s', irc.name, usermodes)
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if usermodes:
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old_modelist = irc.users[target].modes
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supported_modes = irc.umodes
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else:
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old_modelist = irc.channels[target].modes
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supported_modes = irc.cmodes
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modelist = set(old_modelist)
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log.debug('(%s) Applying modes %r on %s (initial modelist: %s)', irc.name, changedmodes, target, modelist)
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for mode in changedmodes:
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# Chop off the +/- part that parseModes gives; it's meaningless for a mode list.
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try:
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real_mode = (mode[0][1], mode[1])
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except IndexError:
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real_mode = mode
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if not usermodes:
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pmode = ''
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for m in ('owner', 'admin', 'op', 'halfop', 'voice'):
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if m in irc.cmodes and real_mode[0] == irc.cmodes[m]:
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pmode = m+'s'
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if pmode:
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pmodelist = irc.channels[target].prefixmodes[pmode]
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log.debug('(%s) Initial prefixmodes list: %s', irc.name, irc.channels[target].prefixmodes)
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if mode[0][0] == '+':
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pmodelist.add(mode[1])
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else:
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pmodelist.discard(mode[1])
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irc.channels[target].prefixmodes[pmode] = pmodelist
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log.debug('(%s) Final prefixmodes list: %s', irc.name, irc.channels[target].prefixmodes)
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if real_mode[0] in irc.prefixmodes:
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# Ignore other prefix modes such as InspIRCd's +Yy
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log.debug('(%s) Not adding mode %s to IrcChannel.modes because '
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'it\'s a prefix mode we don\'t care about.', irc.name, str(mode))
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continue
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if mode[0][0] == '+':
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# We're adding a mode
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existing = [m for m in modelist if m[0] == real_mode[0] and m[1] != real_mode[1]]
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if existing and real_mode[1] and real_mode[0] not in irc.cmodes['*A']:
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# The mode we're setting takes a parameter, but is not a list mode (like +beI).
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# Therefore, only one version of it can exist at a time, and we must remove
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# any old modepairs using the same letter. Otherwise, we'll get duplicates when,
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# for example, someone sets mode "+l 30" on a channel already set "+l 25".
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log.debug('(%s) Old modes for mode %r exist on %s, removing them: %s',
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irc.name, real_mode, target, str(existing))
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[modelist.discard(oldmode) for oldmode in existing]
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modelist.add(real_mode)
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log.debug('(%s) Adding mode %r on %s', irc.name, real_mode, target)
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else:
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log.debug('(%s) Removing mode %r on %s', irc.name, real_mode, target)
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# We're removing a mode
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if real_mode[1] is None:
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# We're removing a mode that only takes arguments when setting.
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# Remove all mode entries that use the same letter as the one
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# we're unsetting.
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for oldmode in modelist.copy():
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if oldmode[0] == real_mode[0]:
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modelist.discard(oldmode)
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else:
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# Swap the - for a + and then remove it from the list.
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modelist.discard(real_mode)
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log.debug('(%s) Final modelist: %s', irc.name, modelist)
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if usermodes:
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irc.users[target].modes = modelist
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else:
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irc.channels[target].modes = modelist
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def joinModes(modes):
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"""Takes a list of (mode, arg) tuples in parseModes() format, and
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joins them into a string.
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See testJoinModes in tests/test_utils.py for some examples."""
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prefix = '+' # Assume we're adding modes unless told otherwise
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modelist = ''
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args = []
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for modepair in modes:
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mode, arg = modepair
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assert len(mode) in (1, 2), "Incorrect length of a mode (received %r)" % mode
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try:
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# If the mode has a prefix, use that.
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curr_prefix, mode = mode
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except ValueError:
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# If not, the current prefix stays the same; move on to the next
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# modepair.
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pass
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else:
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# If the prefix of this mode isn't the same as the last one, add
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# the prefix to the modestring. This prevents '+nt-lk' from turning
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# into '+n+t-l-k' or '+ntlk'.
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if prefix != curr_prefix:
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modelist += curr_prefix
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prefix = curr_prefix
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modelist += mode
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if arg is not None:
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args.append(arg)
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if not modelist.startswith(('+', '-')):
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# Our starting mode didn't have a prefix with it. Assume '+'.
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modelist = '+' + modelist
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if args:
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# Add the args if there are any.
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modelist += ' %s' % ' '.join(args)
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return modelist
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def _flip(mode):
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"""Flips a mode character."""
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# Make it a list first, strings don't support item assignment
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mode = list(mode)
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if mode[0] == '-': # Query is something like "-n"
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mode[0] = '+' # Change it to "+n"
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elif mode[0] == '+':
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mode[0] = '-'
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else: # No prefix given, assume +
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mode.insert(0, '-')
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return ''.join(mode)
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def reverseModes(irc, target, modes, oldobj=None):
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"""Reverses/Inverts the mode string or mode list given.
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Optionally, an oldobj argument can be given to look at an earlier state of
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a channel/user object, e.g. for checking the op status of a mode setter
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before their modes are processed and added to the channel state.
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This function allows both mode strings or mode lists. Example uses:
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"+mi-lk test => "-mi+lk test"
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"mi-k test => "-mi+k test"
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[('+m', None), ('+r', None), ('+l', '3'), ('-o', 'person')
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=> {('-m', None), ('-r', None), ('-l', None), ('+o', 'person')})
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{('s', None), ('+o', 'whoever') => {('-s', None), ('-o', 'whoever')})
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"""
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origtype = type(modes)
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# If the query is a string, we have to parse it first.
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if origtype == str:
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modes = parseModes(irc, target, modes.split(" "))
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# Get the current mode list first.
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if isChannel(target):
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c = oldobj or irc.channels[target]
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oldmodes = c.modes.copy()
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possible_modes = irc.cmodes.copy()
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# For channels, this also includes the list of prefix modes.
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possible_modes['*A'] += ''.join(irc.prefixmodes)
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for name, userlist in c.prefixmodes.items():
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try:
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oldmodes.update([(irc.cmodes[name[:-1]], u) for u in userlist])
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except KeyError:
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continue
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else:
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oldmodes = irc.users[target].modes
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possible_modes = irc.umodes
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newmodes = []
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log.debug('(%s) reverseModes: old/current mode list for %s is: %s', irc.name,
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target, oldmodes)
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for char, arg in modes:
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# Mode types:
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# A = Mode that adds or removes a nick or address to a list. Always has a parameter.
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# B = Mode that changes a setting and always has a parameter.
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# C = Mode that changes a setting and only has a parameter when set.
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# D = Mode that changes a setting and never has a parameter.
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mchar = char[-1]
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if mchar in possible_modes['*B'] + possible_modes['*C']:
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# We need to find the current mode list, so we can reset arguments
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# for modes that have arguments. For example, setting +l 30 on a channel
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# that had +l 50 set should give "+l 30", not "-l".
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oldarg = [m for m in oldmodes if m[0] == mchar]
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if oldarg: # Old mode argument for this mode existed, use that.
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oldarg = oldarg[0]
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mpair = ('+%s' % oldarg[0], oldarg[1])
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else: # Not found, flip the mode then.
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# Mode takes no arguments when unsetting.
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if mchar in possible_modes['*C'] and char[0] != '-':
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arg = None
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mpair = (_flip(char), arg)
|
|
else:
|
|
mpair = (_flip(char), arg)
|
|
if char[0] != '-' and (mchar, arg) in oldmodes:
|
|
# Mode is already set.
|
|
log.debug("(%s) reverseModes: skipping reversing '%s %s' with %s since we're "
|
|
"setting a mode that's already set.", irc.name, char, arg, mpair)
|
|
continue
|
|
elif char[0] == '-' and (mchar, arg) not in oldmodes and mchar in possible_modes['*A']:
|
|
# We're unsetting a prefixmode that was never set - don't set it in response!
|
|
# Charybdis lacks verification for this server-side.
|
|
log.debug("(%s) reverseModes: skipping reversing '%s %s' with %s since it "
|
|
"wasn't previously set.", irc.name, char, arg, mpair)
|
|
continue
|
|
newmodes.append(mpair)
|
|
|
|
log.debug('(%s) reverseModes: new modes: %s', irc.name, newmodes)
|
|
if origtype == str:
|
|
# If the original query is a string, send it back as a string.
|
|
return joinModes(newmodes)
|
|
else:
|
|
return set(newmodes)
|
|
|
|
def isInternalClient(irc, numeric):
|
|
"""
|
|
Checks whether the given numeric is a PyLink Client,
|
|
returning the SID of the server it's on if so.
|
|
"""
|
|
for sid in irc.servers:
|
|
if irc.servers[sid].internal and numeric in irc.servers[sid].users:
|
|
return sid
|
|
|
|
def isInternalServer(irc, sid):
|
|
"""Returns whether the given SID is an internal PyLink server."""
|
|
return (sid in irc.servers and irc.servers[sid].internal)
|
|
|
|
def isOper(irc, uid, allowAuthed=True, allowOper=True):
|
|
"""
|
|
Returns whether the given user has operator status on PyLink. This can be achieved
|
|
by either identifying to PyLink as admin (if allowAuthed is True),
|
|
or having user mode +o set (if allowOper is True). At least one of
|
|
allowAuthed or allowOper must be True for this to give any meaningful
|
|
results.
|
|
"""
|
|
if uid in irc.users:
|
|
if allowOper and ("o", None) in irc.users[uid].modes:
|
|
return True
|
|
elif allowAuthed and irc.users[uid].identified:
|
|
return True
|
|
return False
|
|
|
|
def checkAuthenticated(irc, uid, allowAuthed=True, allowOper=True):
|
|
"""
|
|
Checks whether the given user has operator status on PyLink, raising
|
|
NotAuthenticatedError and logging the access denial if not.
|
|
"""
|
|
lastfunc = inspect.stack()[1][3]
|
|
if not isOper(irc, uid, allowAuthed=allowAuthed, allowOper=allowOper):
|
|
log.warning('(%s) Access denied for %s calling %r', irc.name,
|
|
getHostmask(irc, uid), lastfunc)
|
|
raise NotAuthenticatedError("You are not authenticated!")
|
|
return True
|
|
|
|
def isManipulatableClient(irc, uid):
|
|
"""
|
|
Returns whether the given user is marked as an internal, manipulatable
|
|
client. Usually, automatically spawned services clients should have this
|
|
set True to prevent interactions with opers (like mode changes) from
|
|
causing desyncs.
|
|
"""
|
|
return isInternalClient(irc, uid) and irc.users[uid].manipulatable
|
|
|
|
def getHostmask(irc, user):
|
|
"""Returns the hostmask of the given user, if present."""
|
|
userobj = irc.users.get(user)
|
|
if userobj is None:
|
|
return '<user object not found>'
|
|
try:
|
|
nick = userobj.nick
|
|
except AttributeError:
|
|
nick = '<unknown nick>'
|
|
try:
|
|
ident = userobj.ident
|
|
except AttributeError:
|
|
ident = '<unknown ident>'
|
|
try:
|
|
host = userobj.host
|
|
except AttributeError:
|
|
host = '<unknown host>'
|
|
return '%s!%s@%s' % (nick, ident, host)
|
|
|
|
def loadModuleFromFolder(name, folder):
|
|
"""
|
|
Imports and returns a module, if existing, from a specific folder.
|
|
"""
|
|
fullpath = os.path.join(folder, '%s.py' % name)
|
|
m = importlib.machinery.SourceFileLoader(name, fullpath).load_module()
|
|
return m
|
|
|
|
def getProtocolModule(protoname):
|
|
"""
|
|
Imports and returns the protocol module requested.
|
|
"""
|
|
return loadModuleFromFolder(protoname, world.protocols_folder)
|
|
|
|
def getDatabaseName(dbname):
|
|
"""
|
|
Returns a database filename with the given base DB name appropriate for the
|
|
current PyLink instance.
|
|
|
|
This returns '<dbname>.db' if the running config name is PyLink's default
|
|
(config.yml), and '<dbname>-<config name>.db' for anything else. For example,
|
|
if this is called from an instance running as './pylink testing.yml', it
|
|
would return '<dbname>-testing.db'."""
|
|
if conf.confname != 'pylink':
|
|
dbname += '-%s' % conf.confname
|
|
dbname += '.db'
|
|
return dbname
|