Limnoria/src/callbacks.py

729 lines
27 KiB
Python

#!/usr/bin/env python
###
# Copyright (c) 2002, Jeremiah Fincher
# 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.
###
"""
This module contains the basic callbacks for handling PRIVMSGs. Both Privmsg
and PrivmsgRegexp classes are provided; for offering callbacks based on
commands and their arguments (much like *nix command line programs) use the
Privmsg class; for offering callbacks based on regular expressions, use the
PrivmsgRegexp class. Read their respective docstrings for more information on
how to use them.
"""
from fix import *
import re
import new
import sets
import time
import shlex
import getopt
import inspect
import textwrap
import threading
from cStringIO import StringIO
import conf
import debug
import utils
import world
import ircdb
import irclib
import ircmsgs
import ircutils
###
# Privmsg: handles privmsg commands in a standard fashion.
###
def addressed(nick, msg):
"""If msg is addressed to 'name', returns the portion after the address.
Otherwise returns the empty string.
"""
if msg.args[0] == nick:
if msg.args[1][0] in conf.prefixChars:
return msg.args[1][1:].strip()
else:
return msg.args[1].strip()
elif ircutils.toLower(msg.args[1]).startswith(nick):
try:
(maybeNick, rest) = msg.args[1].split(None, 1)
while not ircutils.isNick(maybeNick):
maybeNick = maybeNick[:-1]
if maybeNick == nick:
return rest
else:
return ''
except ValueError: # split didn't work.
return ''
elif msg.args[1] and msg.args[1][0] in conf.prefixChars:
return msg.args[1][1:].strip()
else:
return ''
def canonicalName(command):
"""Turn a command into its canonical form.
Currently, this makes everything lowercase and removes all dashes and
underscores.
"""
return command.translate(string.ascii, '\t -_').lower()
def reply(msg, s, prefixName=True, private=False):
"""Makes a reply to msg with the payload s"""
s = ircutils.safeArgument(s)
if ircutils.isChannel(msg.args[0]) and not private:
if prefixName:
m = ircmsgs.privmsg(msg.args[0], '%s: %s' % (msg.nick, s))
else:
m = ircmsgs.privmsg(msg.args[0], s)
else:
m = ircmsgs.privmsg(msg.nick, s)
return m
def error(msg, s):
"""Makes an error reply to msg with the appropriate error payload."""
return reply(msg, 'Error: ' + s)
class RateLimiter:
"""This class is used to rate limit replies to certain people, in order to
prevent abuse of the bot. Basically, you put messages in with the .put
method, and then take a message out with the .get method. .get may return
None if there is no message waiting that isn't being rate limited.
"""
# lastRequest must be class-global, so each instance of it uses the same
# information. Otherwise, if it was an instance variable, then rate
# limiting would only work within a single plugin.
lastRequest = {}
def __init__(self):
self.limited = []
self.unlimited = []
def get(self):
if self.unlimited:
return self.unlimited.pop(0)
elif self.limited:
for i in range(len(self.limited)):
msg = self.limited[i]
if not self.limit(msg, penalize=False):
return self.limited.pop(i)
return None
else:
return None
def put(self, msg):
t = self.limit(msg)
if t and not world.testing:
s = 'Limiting message from %s for %s seconds' % (msg.prefix, t)
debug.msg(s, 'normal')
self.limited.append(msg)
else:
self.unlimited.append(msg)
def limit(self, msg, penalize=True):
if msg.prefix and ircutils.isUserHostmask(msg.prefix):
(nick, user, host) = ircutils.splitHostmask(msg.prefix)
key = '@'.join((user, host))
now = time.time()
if ircdb.checkCapabilities(msg.prefix, ('owner', 'admin')):
return 0
if key in self.lastRequest:
# Here's how we throttle requests. We keep a dictionary of
# (lastRequest, wait period) tuples. When a request arrives,
# we check to see if we have a lastRequest tuple, and if so,
# we check to make sure that lastRequest was more than wait
# seconds ago. If not, we're getting flooded, and we set
# the lastRequest time to the current time and increment wait,
# thus making it even harder for the flooder to get us to
# send them messages.
(t, wait) = self.lastRequest[key]
if now - t <= wait:
if penalize:
newWait = wait + conf.throttleTime
else:
newWait = wait - (now - t)
self.lastRequest[key] = (now, newWait)
return newWait
else:
self.lastRequest[key] = (now, conf.throttleTime)
return 0
else:
self.lastRequest[key] = (now, conf.throttleTime)
return 0
else:
return 0
class Error(Exception):
"""Generic class for errors in Privmsg callbacks."""
pass
class ArgumentError(Error):
"""The bot replies with a help message when this is raised."""
pass
class CannotNest(Error):
"""Exception to be raised by commands that cannot be nested."""
pass
class Tokenizer:
# This will be used as a global environment to evaluate strings in.
# Evaluation is, of course, necessary in order to allowed escaped
# characters to be properly handled.
#
# These are the characters valid in a token. Everything printable except
# double-quote, left-bracket, and right-bracket.
validChars = string.ascii[33:].translate(string.ascii, '"[]')
def __init__(self, tokens=''):
# Add a '|' to tokens to have the pipe syntax.
self.validChars = self.validChars.translate(string.ascii, tokens)
def handleToken(self, token):
while token and token[0] == '"' and token[-1] == token[0]:
if len(token) > 1:
token = token[1:-1].decode('string_escape') # 2.3+
else:
break
return token
def insideBrackets(self, lexer):
ret = []
while True:
token = lexer.get_token()
if not token:
raise SyntaxError, 'Missing "]"'
elif token == ']':
return ret
elif token == '[':
ret.append(self.insideBrackets(lexer))
else:
ret.append(self.handleToken(token))
return ret
def tokenize(self, s):
lexer = shlex.shlex(StringIO(s))
lexer.commenters = ''
lexer.quotes = '"'
lexer.wordchars = self.validChars
args = []
ends = []
while True:
token = lexer.get_token()
#debug.printf(repr(token))
if not token:
break
elif token == '|':
if not args:
raise SyntaxError, '"|" with nothing preceding'
ends.append(args)
args = []
elif token == '[':
args.append(self.insideBrackets(lexer))
elif token == ']':
raise SyntaxError, 'Spurious "["'
else:
args.append(self.handleToken(token))
if ends:
if not args:
raise SyntaxError, '"|" with nothing following'
args.append(ends.pop())
while ends:
args[-1].append(ends.pop())
return args
def tokenize(s):
"""A utility function to create a Tokenizer and tokenize a string."""
start = time.time()
try:
if conf.enablePipeSyntax:
tokens = '|'
else:
tokens = ''
args = Tokenizer(tokens).tokenize(s)
except ValueError, e:
raise SyntaxError, str(e)
debug.msg('tokenize took %s seconds.' % (time.time() - start), 'verbose')
return args
def getCommands(tokens):
L = []
if tokens and isinstance(tokens, list):
L.append(tokens[0])
for elt in tokens:
L.extend(getCommands(elt))
return L
def findCallbackForCommand(irc, commandName):
"""Given a command name and an Irc object, returns the callback that
command is in. Returns None if there is no callback with that command."""
for callback in irc.callbacks:
if not isinstance(callback, PrivmsgRegexp):
if hasattr(callback, 'isCommand'):
if callback.isCommand(commandName):
return callback
return None
class IrcObjectProxy:
"A proxy object to allow proper nested of commands (even threaded ones)."
def __init__(self, irc, msg, args):
#debug.printf('__init__: %s' % args)
if not args:
irc.reply(msg, '[]')
else:
self.irc = irc
self.msg = msg
self.args = args
self.counter = 0
self.finalEvaled = False
self.action = False
self.private = False
self.prefixName = True
self.noLengthCheck = False
world.commandsProcessed += 1
self.evalArgs()
def findCallback(self, commandName):
# Mostly for backwards compatibility now.
return findCallbackForCommand(self.irc, commandName)
def evalArgs(self):
while self.counter < len(self.args):
if type(self.args[self.counter]) == str:
self.counter += 1
else:
IrcObjectProxy(self, self.msg, self.args[self.counter])
return
self.finalEval()
def finalEval(self):
if self.finalEvaled:
raise ValueError, 'finalEval called twice. Odd.'
self.finalEvaled = True
originalName = self.args.pop(0)
name = canonicalName(originalName)
cb = self.findCallback(name)
try:
if cb is not None:
anticap = ircdb.makeAntiCapability(name)
#debug.printf('Checking for %s' % anticap)
if ircdb.checkCapability(self.msg.prefix, anticap):
#debug.printf('Being prevented with anticap')
debug.msg('Preventing %s from calling %s' % \
(self.msg.nick, name), 'normal')
self.error(self.msg, conf.replyNoCapability % name)
return
recipient = self.msg.args[0]
if ircutils.isChannel(recipient):
chancap = ircdb.makeChannelCapability(recipient, anticap)
#debug.printf('Checking for %s' % chancap)
if ircdb.checkCapability(self.msg.prefix, chancap):
#debug.printf('Being prevented with chancap')
debug.msg('Preventing %s from calling %s' % \
(self.msg.nick, name), 'normal')
self.error(self.msg, conf.replyNoCapability % name)
return
command = getattr(cb, name)
if cb.threaded:
t = CommandThread(cb.callCommand, command,
self, self.msg, self.args)
t.start()
else:
cb.callCommand(command, self, self.msg, self.args)
else:
self.args.insert(0, originalName)
if not isinstance(self.irc, irclib.Irc):
# If self.irc is an actual irclib.Irc, then this is the
# first command given, and should be ignored as usual.
self.reply(self.msg, '[%s]' % ' '.join(self.args))
except (getopt.GetoptError, ArgumentError):
if hasattr(command, '__doc__'):
s = '%s %s' % (name, command.__doc__.splitlines()[0])
else:
s = 'Invalid arguments for %s.' % name
self.reply(self.msg, s)
except CannotNest, e:
if not isinstance(self.irc, irclib.Irc):
self.error(self.msg, 'Command %r cannot be nested.' % name)
except (SyntaxError, Error), e:
self.reply(self.msg, debug.exnToString(e))
except Exception, e:
debug.recoverableException()
self.error(self.msg, debug.exnToString(e))
def reply(self, msg, s, noLengthCheck=False, prefixName=True,
action=False, private=False):
# These use |= or &= based on whether or not they default to True or
# False. Those that default to True use &=; those that default to
# False use |=.
self.action |= action
self.private |= private
self.prefixName &= prefixName
self.noLengthCheck |= noLengthCheck
if self.finalEvaled:
if isinstance(self.irc, self.__class__):
self.irc.reply(msg, s, self.noLengthCheck, self.prefixName,
self.action, self.private)
elif self.noLengthCheck:
self.irc.queueMsg(reply(msg, s, self.prefixName))
elif self.action:
self.irc.queueMsg(ircmsgs.action(msg.args[0], s))
else:
# The size of a PRIVMSG is:
# 1 for the colon
# len(prefix)
# 1 for the space
# 7 for the PRIVMSG
# 1 for the space
# len(target)
# 1 for the space
# 1 for the colon
# len(payload)
# 2 for the \r\n
# So non-variable stuff it's 1+1+7+1+1+1+2, or 14
# We'll estimate the channel length at 30, and we'll know the
# prefix length exactly. We also might append the string
# " (more)" to the end, so that's 7 more characters.
# 512 - 51 == 461.
s = ircutils.safeArgument(s)
allowedLength = 450 - len(self.irc.prefix)
msgs = textwrap.wrap(s, allowedLength-30) # -30 is for "nick:"
msgs.reverse()
response = msgs.pop()
if msgs:
response += ' \x02(%s)\x0F' % \
utils.nItems(len(msgs), 'message', 'more')
mask = msg.prefix.split('!', 1)[1]
Privmsg._mores[mask] = msgs
private = self.private or not ircutils.isChannel(msg.args[0])
Privmsg._mores[msg.nick] = (private, msgs)
if self.private:
debug.printf('got here!')
self.irc.queueMsg(ircmsgs.privmsg(msg.nick, response))
else:
self.irc.queueMsg(reply(msg, response, self.prefixName))
else:
self.args[self.counter] = s
self.evalArgs()
def error(self, msg, s, private=False):
if isinstance(self.irc, self.__class__):
self.irc.error(msg, s, private)
else:
s = 'Error: ' + s
if private or conf.errorReplyPrivate:
self.irc.queueMsg(ircmsgs.privmsg(msg.nick, s))
else:
self.irc.queueMsg(reply(msg, s))
def killProxy(self):
if not isinstance(self.irc, irclib.Irc):
self.irc.killProxy()
self.__dict__ = {}
def getRealIrc(self):
if isinstance(self.irc, irclib.Irc):
return self.irc
else:
return self.irc.getRealIrc()
def __getattr__(self, attr):
#return getattr(self.getRealIrc(), attr)
return getattr(self.irc, attr)
class CommandThread(threading.Thread):
"""Just does some extra logging and error-recovery for commands that need
to run in threads.
"""
def __init__(self, callCommand, command, irc, msg, args, *L):
self.command = command
world.threadsSpawned += 1
try:
self.commandName = command.im_func.func_name
except AttributeError:
self.commandName = command.__name__
try:
self.className = command.im_class.__name__
except AttributeError:
self.className = '<unknown>'
name = '%s.%s with args %r' % (self.className, self.commandName, args)
threading.Thread.__init__(self, target=callCommand, name=name,
args=(command, irc, msg, args)+L)
debug.msg('Spawning thread %s' % name, 'verbose')
self.irc = irc
self.msg = msg
self.setDaemon(True)
def run(self):
try:
threading.Thread.run(self)
except (getopt.GetoptError, ArgumentError):
if hasattr(self.command, '__doc__'):
help = self.command.__doc__.splitlines()[0]
s = '%s %s' % (self.commandName, help)
else:
s = 'Invalid arguments for %s.' % self.commandName
self.irc.reply(self.msg, s)
except CannotNest:
if not isinstance(self.irc.irc, irclib.Irc):
s = 'Command %r cannot be nested.' % self.commandName
self.irc.error(self.msg, s)
except (SyntaxError, Error), e:
self.irc.reply(self.msg, debug.exnToString(e))
except Exception, e:
debug.recoverableException()
self.irc.error(self.msg, debug.exnToString(e))
class ConfigIrcProxy(object):
"""Used as a proxy Irc object during configuration. """
def __init__(self, irc):
self.__dict__['irc'] = irc
def reply(self, msg, s):
return None
def error(self, msg, s):
debug.msg('ConfigIrcProxy saw an error: %s' % s, 'normal')
findCallback = IrcObjectProxy.findCallback.im_func
def getRealIrc(self):
irc = self.__dict__['irc']
while(hasattr(irc, 'getRealIrc')):
irc = irc.getRealIrc()
return irc
def __getattr__(self, attr):
return getattr(self.getRealIrc(), attr)
def __setattr__(self, attr, value):
setattr(self.getRealIrc(), attr, value)
class Privmsg(irclib.IrcCallback):
"""Base class for all Privmsg handlers."""
threaded = False
public = True
commandArgs = ['self', 'irc', 'msg', 'args']
_mores = {} # This must be class-scope, so all subclasses use the same one.
def __init__(self):
self.rateLimiter = RateLimiter()
self.Proxy = IrcObjectProxy
def configure(self, irc):
fakeIrc = ConfigIrcProxy(irc)
for args in conf.commandsOnStart:
args = args[:]
command = args.pop(0)
if self.isCommand(command):
#debug.printf('%s: %r' % (command, args))
method = getattr(self, command)
line = '%s %s' % (command, ' '.join(map(utils.dqrepr, args)))
msg = ircmsgs.privmsg(fakeIrc.nick, line, fakeIrc.prefix)
try:
world.startup = True
method(fakeIrc, msg, args)
finally:
world.startup = False
def __call__(self, irc, msg):
irclib.IrcCallback.__call__(self, irc, msg)
# Now, if there's anything in the rateLimiter...
msg = self.rateLimiter.get()
while msg:
s = addressed(irc.nick, msg)
try:
args = tokenize(s)
self.Proxy(irc, msg, args)
except SyntaxError, e:
irc.queueMsg(reply(msg, str(e)))
msg = self.rateLimiter.get()
def isCommand(self, methodName):
# This function is ugly, but I don't want users to call methods like
# doPrivmsg or __init__ or whatever, and this is good to stop them.
if hasattr(self, methodName):
method = getattr(self, methodName)
if inspect.ismethod(method):
code = method.im_func.func_code
return inspect.getargs(code)[0] == self.commandArgs
else:
return False
else:
return False
def callCommand(self, f, irc, msg, args, *L):
# Exceptions aren't caught here because IrcObjectProxy.finalEval
# catches them and does The Right Thing.
start = time.time()
f(irc, msg, args, *L)
elapsed = time.time() - start
funcname = f.im_func.func_name
debug.msg('%s.%s took %s seconds' % \
(f.im_class.__name__, funcname, elapsed), 'verbose')
_r = re.compile(r'^([^\s[]+)(?:\[|\s+|$)')
def doPrivmsg(self, irc, msg, rateLimit=True):
s = addressed(irc.nick, msg)
#debug.printf('Privmsg.doPrivmsg: s == %r' % s)
if s:
recipient = msg.args[0]
if ircdb.checkIgnored(msg.prefix, recipient):
debug.msg('Privmsg.doPrivmsg: ignoring %s.' % msg.prefix)
return
m = self._r.match(s)
if m and self.isCommand(canonicalName(m.group(1))):
if rateLimit:
self.rateLimiter.put(msg)
msg = self.rateLimiter.get()
if msg:
try:
args = tokenize(s)
if conf.replyWhenNotCommand:
for command in getCommands(args):
command = canonicalName(command)
if not findCallbackForCommand(irc, command):
return
self.Proxy(irc, msg, args)
except SyntaxError, e:
irc.queueMsg(reply(msg, debug.exnToString(e)))
class IrcObjectProxyRegexp:
def __init__(self, irc, *args):
self.irc = irc
def error(self, msg, s):
self.reply(msg, 'Error: ' + s)
def reply(self, msg, s, prefixName=True, action=False, private=False,):
if action:
self.irc.queueMsg(ircmsgs.action(ircutils.replyTo(msg), s))
else:
self.irc.queueMsg(reply(msg, s, private=private,
prefixName=prefixName))
def __getattr__(self, attr):
return getattr(self.irc, attr)
class PrivmsgRegexp(Privmsg):
"""A class to allow a person to create regular expression callbacks.
Much more primitive, but more flexible than the 'normal' method of using
the Privmsg class and its lexer, PrivmsgRegexp allows you to write
callbacks that aren't addressed to the bot, for instance. There are, of
course, several other possibilities. Callbacks are registered with a
string (the regular expression) and a function to be called (with the Irc
object, the IrcMsg object, and the match object) when the regular
expression matches. Callbacks must have the signature (self, irc, msg,
match) to be counted as such.
A class-level flags attribute is used to determine what regexp flags to
compile the regular expressions with. By default, it's re.I, which means
regular expressions are by default case-insensitive.
If you have a standard command-type callback, though, Privmsg is a much
better class to use, at the very least for consistency's sake, but also
because it's much more easily coded and maintained.
"""
threaded = False # Again, like Privmsg...
flags = re.I
onlyFirstMatch = False
commandArgs = ['self', 'irc', 'msg', 'match']
def __init__(self):
Privmsg.__init__(self)
self.Proxy = IrcObjectProxyRegexp
self.res = []
#for name, value in self.__class__.__dict__.iteritems():
for name, value in self.__class__.__dict__.items():
value = getattr(self, name)
if self.isCommand(name):
try:
r = re.compile(value.__doc__, self.flags)
self.res.append((r, value))
except re.error, e:
s = '%s.%s has an invalid regexp %s: %s' % \
(self.__class__.__name__, name,
value.__doc__, debug.exnToString(e))
debug.msg(s)
self.res.sort(lambda (r1, m1), (r2, m2): cmp(m1.__name__, m2.__name__))
def doPrivmsg(self, irc, msg):
if ircdb.checkIgnored(msg.prefix, msg.args[0]):
debug.msg('PrivmsgRegexp.doPrivmsg: ignoring %s' % msg.prefix)
return
fed = False
for (r, method) in self.res:
for m in r.finditer(msg.args[1]):
if not fed:
fed = True
self.rateLimiter.put(msg)
msg = self.rateLimiter.get()
if msg:
self.callCommand(method, irc, msg, m)
if self.onlyFirstMatch:
return
class PrivmsgCommandAndRegexp(Privmsg):
"""Same as Privmsg, except allows the user to also include regexp-based
callbacks. All regexp-based callbacks must be specified in a sets.Set
(or list) attribute "regexps".
"""
flags = re.I
regexps = sets.Set()
def __init__(self):
Privmsg.__init__(self)
self.res = []
for name in self.regexps:
method = getattr(self, name)
r = re.compile(method.__doc__, self.flags)
self.res.append((r, method))
self.res.sort(lambda (r1, m1), (r2, m2): cmp(m1.__name__, m2.__name__))
def doPrivmsg(self, irc, msg):
if ircdb.checkIgnored(msg.prefix, msg.args[0]):
return
fed = False
for (r, method) in self.res:
for m in r.finditer(msg.args[1]):
if not fed:
fed = True
self.rateLimiter.put(msg)
msg = self.rateLimiter.get()
if msg:
self.callCommand(method, IrcObjectProxyRegexp(irc), msg, m)
Privmsg.doPrivmsg(self, irc, msg, rateLimit=(not fed))
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: