Limnoria/src/ircutils.py

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###
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# Copyright (c) 2002-2005, Jeremiah Fincher
# Copyright (c) 2009,2011, James McCoy
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# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
"""
Provides a great number of useful utility functions for IRC. Things to muck
around with hostmasks, set bold or color on strings, IRC-case-insensitive
dicts, a nick class to handle nicks (so comparisons and hashing and whatnot
work in an IRC-case-insensitive fashion), and numerous other things.
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"""
from __future__ import division
from __future__ import print_function
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import re
import sys
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import time
import random
import string
import textwrap
import functools
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from cStringIO import StringIO as sio
from . import utils
from . import minisix
from itertools import imap
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def debug(s, *args):
"""Prints a debug string. Most likely replaced by our logging debug."""
print('***', s % args)
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userHostmaskRe = re.compile(r'^\S+!\S+@\S+$')
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def isUserHostmask(s):
"""Returns whether or not the string s is a valid User hostmask."""
return userHostmaskRe.match(s) is not None
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def isServerHostmask(s):
"""s => bool
Returns True if s is a valid server hostmask."""
return not isUserHostmask(s)
def nickFromHostmask(hostmask):
"""hostmask => nick
Returns the nick from a user hostmask."""
assert isUserHostmask(hostmask)
return splitHostmask(hostmask)[0]
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def userFromHostmask(hostmask):
"""hostmask => user
Returns the user from a user hostmask."""
assert isUserHostmask(hostmask)
return splitHostmask(hostmask)[1]
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def hostFromHostmask(hostmask):
"""hostmask => host
Returns the host from a user hostmask."""
assert isUserHostmask(hostmask)
return splitHostmask(hostmask)[2]
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def splitHostmask(hostmask):
"""hostmask => (nick, user, host)
Returns the nick, user, host of a user hostmask."""
assert isUserHostmask(hostmask)
nick, rest = hostmask.split('!', 1)
user, host = rest.split('@', 1)
return (minisix.intern(nick), minisix.intern(user), minisix.intern(host))
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def joinHostmask(nick, ident, host):
"""nick, user, host => hostmask
Joins the nick, ident, host into a user hostmask."""
assert nick and ident and host
return minisix.intern('%s!%s@%s' % (nick, ident, host))
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_rfc1459trans = utils.str.MultipleReplacer(dict(zip(
string.ascii_uppercase + r'\[]~',
string.ascii_lowercase + r'|{}^')))
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def toLower(s, casemapping=None):
"""s => s
Returns the string s lowered according to IRC case rules."""
if casemapping is None or casemapping == 'rfc1459':
return _rfc1459trans(s)
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elif casemapping == 'ascii': # freenode
return s.lower()
else:
raise ValueError('Invalid casemapping: %r' % casemapping)
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def strEqual(nick1, nick2):
"""s1, s2 => bool
Returns True if nick1 == nick2 according to IRC case rules."""
assert isinstance(nick1, basestring)
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assert isinstance(nick2, basestring)
return toLower(nick1) == toLower(nick2)
nickEqual = strEqual
_nickchars = r'[]\`_^{|}'
nickRe = re.compile(r'^[A-Za-z%s][-0-9A-Za-z%s]*$'
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% (re.escape(_nickchars), re.escape(_nickchars)))
def isNick(s, strictRfc=True, nicklen=None):
"""s => bool
Returns True if s is a valid IRC nick."""
if strictRfc:
ret = bool(nickRe.match(s))
if ret and nicklen is not None:
ret = len(s) <= nicklen
return ret
else:
return not isChannel(s) and \
not isUserHostmask(s) and \
not ' ' in s and not '!' in s
def areNicks(s, strictRfc=True, nicklen=None):
"""Like 'isNick(x)' but for comma-separated list."""
nick = functools.partial(isNick, strictRfc=strictRfc, nicklen=nicklen)
return all(map(nick, s.split(',')))
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def isChannel(s, chantypes='#&+!', channellen=50):
"""s => bool
Returns True if s is a valid IRC channel name."""
return s and \
',' not in s and \
'\x07' not in s and \
s[0] in chantypes and \
len(s) <= channellen and \
len(s.split(None, 1)) == 1
def areChannels(s, chantypes='#&+!',channellen=50):
"""Like 'isChannel(x)' but for comma-separated list."""
chan = functools.partial(isChannel, chantypes=chantypes,
channellen=channellen)
return all(map(chan, s.split(',')))
def areReceivers(s, strictRfc=True, nicklen=None, chantypes='#&+!',
channellen=50):
"""Like 'isNick(x) or isChannel(x)' but for comma-separated list."""
nick = functools.partial(isNick, strictRfc=strictRfc, nicklen=nicklen)
chan = functools.partial(isChannel, chantypes=chantypes,
channellen=channellen)
return all(map(lambda x:nick(x) or chan(x), s.split(',')))
_patternCache = utils.structures.CacheDict(1000)
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def _hostmaskPatternEqual(pattern, hostmask):
try:
return _patternCache[pattern](hostmask) is not None
except KeyError:
# We make our own regexps, rather than use fnmatch, because fnmatch's
# case-insensitivity is not IRC's case-insensitity.
fd = sio()
for c in pattern:
if c == '*':
fd.write('.*')
elif c == '?':
fd.write('.')
elif c in '[{':
fd.write('[[{]')
elif c in '}]':
fd.write(r'[}\]]')
elif c in '|\\':
fd.write(r'[|\\]')
elif c in '^~':
fd.write('[~^]')
else:
fd.write(re.escape(c))
fd.write('$')
f = re.compile(fd.getvalue(), re.I).match
_patternCache[pattern] = f
return f(hostmask) is not None
_hostmaskPatternEqualCache = utils.structures.CacheDict(1000)
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def hostmaskPatternEqual(pattern, hostmask):
"""pattern, hostmask => bool
Returns True if hostmask matches the hostmask pattern pattern."""
try:
return _hostmaskPatternEqualCache[(pattern, hostmask)]
except KeyError:
b = _hostmaskPatternEqual(pattern, hostmask)
_hostmaskPatternEqualCache[(pattern, hostmask)] = b
return b
def banmask(hostmask):
"""Returns a properly generic banning hostmask for a hostmask.
>>> banmask('nick!user@host.domain.tld')
'*!*@*.domain.tld'
>>> banmask('nick!user@10.0.0.1')
'*!*@10.0.0.*'
"""
assert isUserHostmask(hostmask)
host = hostFromHostmask(hostmask)
if utils.net.isIPV4(host):
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L = host.split('.')
L[-1] = '*'
return '*!*@' + '.'.join(L)
elif utils.net.isIPV6(host):
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L = host.split(':')
L[-1] = '*'
return '*!*@' + ':'.join(L)
else:
if len(host.split('.')) > 2: # If it is a subdomain
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return '*!*@*%s' % host[host.find('.'):]
else:
return '*!*@' + host
_plusRequireArguments = 'ovhblkqeI'
_minusRequireArguments = 'ovhbkqeI'
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def separateModes(args):
"""Separates modelines into single mode change tuples. Basically, you
should give it the .args of a MODE IrcMsg.
Examples:
>>> separateModes(['+ooo', 'jemfinch', 'StoneTable', 'philmes'])
[('+o', 'jemfinch'), ('+o', 'StoneTable'), ('+o', 'philmes')]
>>> separateModes(['+o-o', 'jemfinch', 'PeterB'])
[('+o', 'jemfinch'), ('-o', 'PeterB')]
>>> separateModes(['+s-o', 'test'])
[('+s', None), ('-o', 'test')]
>>> separateModes(['+sntl', '100'])
[('+s', None), ('+n', None), ('+t', None), ('+l', 100)]
"""
if not args:
return []
modes = args[0]
assert modes[0] in '+-', 'Invalid args: %r' % args
args = list(args[1:])
ret = []
for c in modes:
if c in '+-':
last = c
else:
if last == '+':
requireArguments = _plusRequireArguments
else:
requireArguments = _minusRequireArguments
if c in requireArguments:
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if not args:
# It happens, for example with "MODE #channel +b", which
# is used for getting the list of all bans.
continue
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arg = args.pop(0)
try:
arg = int(arg)
except ValueError:
pass
ret.append((last + c, arg))
else:
ret.append((last + c, None))
return ret
def joinModes(modes):
"""[(mode, targetOrNone), ...] => args
Joins modes of the same form as returned by separateModes."""
args = []
modeChars = []
currentMode = '\x00'
for (mode, arg) in modes:
if arg is not None:
args.append(arg)
if not mode.startswith(currentMode):
currentMode = mode[0]
modeChars.append(mode[0])
modeChars.append(mode[1])
args.insert(0, ''.join(modeChars))
return args
def bold(s):
"""Returns the string s, bolded."""
return '\x02%s\x02' % s
def reverse(s):
"""Returns the string s, reverse-videoed."""
return '\x16%s\x16' % s
def underline(s):
"""Returns the string s, underlined."""
return '\x1F%s\x1F' % s
# Definition of mircColors dictionary moved below because it became an IrcDict.
def mircColor(s, fg=None, bg=None):
"""Returns s with the appropriate mIRC color codes applied."""
if fg is None and bg is None:
return s
elif bg is None:
if str(fg) in mircColors:
fg = mircColors[str(fg)]
elif len(str(fg)) > 1:
fg = mircColors[str(fg)[:-1]]
else:
# Should not happen
pass
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return '\x03%s%s\x03' % (fg.zfill(2), s)
elif fg is None:
bg = mircColors[str(bg)]
# According to the mirc color doc, a fg color MUST be specified if a
# background color is specified. So, we'll specify 00 (white) if the
# user doesn't specify one.
return '\x0300,%s%s\x03' % (bg.zfill(2), s)
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else:
fg = mircColors[str(fg)]
bg = mircColors[str(bg)]
# No need to zfill fg because the comma delimits.
return '\x03%s,%s%s\x03' % (fg, bg.zfill(2), s)
def canonicalColor(s, bg=False, shift=0):
"""Assigns an (fg, bg) canonical color pair to a string based on its hash
value. This means it might change between Python versions. This pair can
be used as a *parameter to mircColor. The shift parameter is how much to
right-shift the hash value initially.
"""
h = hash(s) >> shift
fg = h % 14 + 2 # The + 2 is to rule out black and white.
if bg:
bg = (h >> 4) & 3 # The 5th, 6th, and 7th least significant bits.
if fg < 8:
bg += 8
else:
bg += 2
return (fg, bg)
else:
return (fg, None)
def stripBold(s):
"""Returns the string s, with bold removed."""
return s.replace('\x02', '')
_stripColorRe = re.compile(r'\x03(?:\d{1,2},\d{1,2}|\d{1,2}|,\d{1,2}|)')
def stripColor(s):
"""Returns the string s, with color removed."""
return _stripColorRe.sub('', s)
def stripReverse(s):
"""Returns the string s, with reverse-video removed."""
return s.replace('\x16', '')
def stripUnderline(s):
"""Returns the string s, with underlining removed."""
return s.replace('\x1f', '').replace('\x1F', '')
def stripFormatting(s):
"""Returns the string s, with all formatting removed."""
# stripColor has to go first because of some strings, check the tests.
s = stripColor(s)
s = stripBold(s)
s = stripReverse(s)
s = stripUnderline(s)
return s.replace('\x0f', '').replace('\x0F', '')
class FormatContext(object):
def __init__(self):
self.reset()
def reset(self):
self.fg = None
self.bg = None
self.bold = False
self.reverse = False
self.underline = False
def start(self, s):
"""Given a string, starts all the formatters in this context."""
if self.bold:
s = '\x02' + s
if self.reverse:
s = '\x16' + s
if self.underline:
s = '\x1f' + s
if self.fg is not None or self.bg is not None:
s = mircColor(s, fg=self.fg, bg=self.bg)[:-1] # Remove \x03.
return s
def end(self, s):
"""Given a string, ends all the formatters in this context."""
if self.bold or self.reverse or \
self.fg or self.bg or self.underline:
# Should we individually end formatters?
s += '\x0f'
return s
class FormatParser(object):
def __init__(self, s):
self.fd = sio(s)
self.last = None
def getChar(self):
if self.last is not None:
c = self.last
self.last = None
return c
else:
return self.fd.read(1)
def ungetChar(self, c):
self.last = c
def parse(self):
context = FormatContext()
c = self.getChar()
while c:
if c == '\x02':
context.bold = not context.bold
elif c == '\x16':
context.reverse = not context.reverse
elif c == '\x1f':
context.underline = not context.underline
elif c == '\x0f':
context.reset()
elif c == '\x03':
self.getColor(context)
c = self.getChar()
return context
def getInt(self):
i = 0
setI = False
c = self.getChar()
while c.isdigit():
j = i * 10
j += int(c)
if j >= 16:
self.ungetChar(c)
break
else:
setI = True
i = j
c = self.getChar()
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self.ungetChar(c)
if setI:
return i
else:
return None
def getColor(self, context):
context.fg = self.getInt()
c = self.getChar()
if c == ',':
context.bg = self.getInt()
else:
self.ungetChar(c)
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def wrap(s, length, break_on_hyphens = False, break_long_words = False):
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processed = []
wrapper = textwrap.TextWrapper(width=length)
wrapper.break_long_words = break_long_words
wrapper.break_on_hyphens = break_on_hyphens
chunks = wrapper.wrap(s)
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context = None
for chunk in chunks:
if context is not None:
chunk = context.start(chunk)
context = FormatParser(chunk).parse()
processed.append(context.end(chunk))
return processed
def isValidArgument(s):
"""Returns whether s is strictly a valid argument for an IRC message."""
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return '\r' not in s and '\n' not in s and '\x00' not in s
def safeArgument(s):
"""If s is unsafe for IRC, returns a safe version."""
if sys.version_info[0] < 3 and isinstance(s, unicode):
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s = s.encode('utf-8')
elif (sys.version_info[0] < 3 and not isinstance(s, basestring)) or \
(sys.version_info[0] >= 3 and not isinstance(s, str)):
debug('Got a non-string in safeArgument: %r', s)
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s = str(s)
if isValidArgument(s):
return s
else:
return repr(s)
def replyTo(msg):
"""Returns the appropriate target to send responses to msg."""
if isChannel(msg.args[0]):
return msg.args[0]
else:
return msg.nick
def dccIP(ip):
"""Converts an IP string to the DCC integer form."""
assert utils.net.isIPV4(ip), \
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'argument must be a string ip in xxx.yyy.zzz.www format.'
i = 0
x = 256**3
for quad in ip.split('.'):
i += int(quad)*x
x //= 256
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return i
def unDccIP(i):
"""Takes an integer DCC IP and return a normal string IP."""
assert isinstance(i, (int, long)), '%r is not an number.' % i
L = []
while len(L) < 4:
L.append(i % 256)
i //= 256
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L.reverse()
return '.'.join(imap(str, L))
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class IrcString(str):
"""This class does case-insensitive comparison and hashing of nicks."""
def __new__(cls, s=''):
x = super(IrcString, cls).__new__(cls, s)
x.lowered = str(toLower(x))
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return x
def __eq__(self, s):
try:
return toLower(s) == self.lowered
except:
return False
def __ne__(self, s):
return not (self == s)
def __hash__(self):
return hash(self.lowered)
class IrcDict(utils.InsensitivePreservingDict):
"""Subclass of dict to make key comparison IRC-case insensitive."""
def key(self, s):
if s is not None:
s = toLower(s)
return s
class CallableValueIrcDict(IrcDict):
def __getitem__(self, k):
v = super(IrcDict, self).__getitem__(k)
if callable(v):
v = v()
return v
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class IrcSet(utils.NormalizingSet):
"""A sets.Set using IrcStrings instead of regular strings."""
def normalize(self, s):
return IrcString(s)
def __reduce__(self):
return (self.__class__, (list(self),))
class FloodQueue(object):
timeout = 0
def __init__(self, timeout=None, queues=None):
if timeout is not None:
self.timeout = timeout
if queues is None:
queues = IrcDict()
self.queues = queues
def __repr__(self):
return 'FloodQueue(timeout=%r, queues=%s)' % (self.timeout,
repr(self.queues))
def key(self, msg):
# This really ought to be configurable without subclassing, but for
# now, it works.
# used to be msg.user + '@' + msg.host but that was too easily abused.
return msg.host
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def getTimeout(self):
if callable(self.timeout):
return self.timeout()
else:
return self.timeout
def _getQueue(self, msg, insert=True):
key = self.key(msg)
try:
return self.queues[key]
except KeyError:
if insert:
# python--
# instancemethod.__repr__ calls the instance.__repr__, which
# means that our __repr__ calls self.queues.__repr__, which
# calls structures.TimeoutQueue.__repr__, which calls
# getTimeout.__repr__, which calls our __repr__, which calls...
getTimeout = lambda : self.getTimeout()
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q = utils.structures.TimeoutQueue(getTimeout)
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self.queues[key] = q
return q
else:
return None
def enqueue(self, msg, what=None):
if what is None:
what = msg
q = self._getQueue(msg)
q.enqueue(what)
def len(self, msg):
q = self._getQueue(msg, insert=False)
if q is not None:
return len(q)
else:
return 0
def has(self, msg, what=None):
q = self._getQueue(msg, insert=False)
if q is not None:
if what is None:
what = msg
for elt in q:
if elt == what:
return True
return False
mircColors = IrcDict({
'white': '0',
'black': '1',
'blue': '2',
'green': '3',
'red': '4',
'brown': '5',
'purple': '6',
'orange': '7',
'yellow': '8',
'light green': '9',
'teal': '10',
'light blue': '11',
'dark blue': '12',
'pink': '13',
'dark grey': '14',
'light grey': '15',
'dark gray': '14',
'light gray': '15',
})
# We'll map integers to their string form so mircColor is simpler.
for (k, v) in mircColors.items():
if k is not None: # Ignore empty string for None.
sv = str(v)
mircColors[sv] = sv
def standardSubstitute(irc, msg, text, env=None):
"""Do the standard set of substitutions on text, and return it"""
if isChannel(msg.args[0]):
channel = msg.args[0]
else:
channel = 'somewhere'
def randInt():
return str(random.randint(-1000, 1000))
def randDate():
t = pow(2,30)*random.random()+time.time()/4.0
return time.ctime(t)
def randNick():
if channel != 'somewhere':
L = list(irc.state.channels[channel].users)
if len(L) > 1:
n = msg.nick
while n == msg.nick:
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n = utils.iter.choice(L)
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return n
else:
return msg.nick
else:
return 'someone'
ctime = time.strftime("%a %b %d %H:%M:%S %Y")
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localtime = time.localtime()
gmtime = time.strftime("%a %b %d %H:%M:%S %Y", time.gmtime())
vars = CallableValueIrcDict({
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'who': msg.nick,
'nick': msg.nick,
'user': msg.user,
'host': msg.host,
'channel': channel,
'botnick': irc.nick,
'now': ctime, 'ctime': ctime,
'utc': gmtime, 'gmt': gmtime,
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'randnick': randNick, 'randomnick': randNick,
'randdate': randDate, 'randomdate': randDate,
'rand': randInt, 'randint': randInt, 'randomint': randInt,
'today': time.strftime('%d %b %Y', localtime),
'year': localtime[0],
'month': localtime[1],
'monthname': time.strftime('%b', localtime),
'date': localtime[2],
'day': time.strftime('%A', localtime),
'h': localtime[3], 'hr': localtime[3], 'hour': localtime[3],
'm': localtime[4], 'min': localtime[4], 'minute': localtime[4],
's': localtime[5], 'sec': localtime[5], 'second': localtime[5],
'tz': time.strftime('%Z', localtime),
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})
if env is not None:
vars.update(env)
t = string.Template(text)
t.idpattern = '[a-zA-Z][a-zA-Z0-9]*'
return t.safe_substitute(vars)
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if __name__ == '__main__':
import sys, doctest
doctest.testmod(sys.modules['__main__'])
# vim:set shiftwidth=4 softtabstop=4 expandtab textwidth=79: