Limnoria/src/ircdb.py

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#!/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.
###
from fix import *
import os
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import sets
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import time
import string
import conf
import debug
import utils
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import world
import ircutils
def fromChannelCapability(capability):
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"""Returns a (channel, capability) tuple from a channel capability."""
if not isChannelCapability(capability):
raise ValueError, '%s is not a channel capability' % capability
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return capability.split('.', 1)
def isChannelCapability(capability):
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"""Returns True if capability is a channel capability; False otherwise."""
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if '.' in capability:
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(channel, capability) = capability.split('.', 1)
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return ircutils.isChannel(channel)
else:
return False
def makeChannelCapability(channel, capability):
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"""Makes a channel capability given a channel and a capability."""
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return '%s.%s' % (channel, capability)
def isAntiCapability(capability):
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"""Returns True if capability is an anticapability; False otherwise."""
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if isChannelCapability(capability):
(_, capability) = fromChannelCapability(capability)
return capability[0] == '!'
def makeAntiCapability(capability):
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"""Returns the anticapability of a given capability."""
assert not isAntiCapability(capability), 'makeAntiCapability does not ' \
'work on anticapabilities; you probably want invertCapability.'
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if '.' in capability:
(channel, capability) = fromChannelCapability(capability)
return '%s.!%s' % (channel, capability)
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else:
return '!' + capability
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def unAntiCapability(capability):
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"""Takes an anticapability and returns the non-anti form."""
if not isAntiCapability(capability):
raise ValueError, '%s is not an anti capability' % capability
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if isChannelCapability(capability):
(channel, capability) = fromChannelCapability(capability)
return '.'.join((channel, capability[1:]))
else:
return capability[1:]
def invertCapability(capability):
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"""Make a capability into an anticapability and vice versa."""
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if isAntiCapability(capability):
return unAntiCapability(capability)
else:
return makeAntiCapability(capability)
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_normal = string.maketrans('\r\n', ' ')
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def _normalize(s):
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return s.translate(_normal)
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class CapabilitySet(sets.Set):
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"""A subclass of set handling basic capability stuff."""
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def __init__(self, capabilities=()):
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sets.Set.__init__(self)
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for capability in capabilities:
self.add(capability)
def add(self, capability):
capability = ircutils.toLower(capability)
inverted = invertCapability(capability)
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if sets.Set.__contains__(self, inverted):
sets.Set.remove(self, inverted)
sets.Set.add(self, capability)
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def remove(self, capability):
capability = ircutils.toLower(capability)
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sets.Set.remove(self, capability)
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def __contains__(self, capability):
capability = ircutils.toLower(capability)
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if sets.Set.__contains__(self, capability):
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return True
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if sets.Set.__contains__(self, invertCapability(capability)):
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return True
else:
return False
def check(self, capability):
capability = ircutils.toLower(capability)
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if sets.Set.__contains__(self, capability):
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return True
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elif sets.Set.__contains__(self, invertCapability(capability)):
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return False
else:
raise KeyError, capability
def repr(self):
return '%s([%r])' % (self.__class__.__name__, ', '.join(self))
class UserCapabilitySet(CapabilitySet):
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"""A subclass of CapabilitySet to handle the owner capability correctly."""
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def __contains__(self, capability):
capability = ircutils.toLower(capability)
if CapabilitySet.__contains__(self, 'owner'):
return True
else:
return CapabilitySet.__contains__(self, capability)
def check(self, capability):
capability = ircutils.toLower(capability)
if capability == 'owner':
if CapabilitySet.__contains__(self, 'owner'):
return True
else:
return False
if 'owner' in self:
if isAntiCapability(capability):
return False
else:
return True
else:
return CapabilitySet.check(self, capability)
def add(self, capability):
capability = ircutils.toLower(capability)
assert capability != '!owner', '"!owner" disallowed.'
CapabilitySet.add(self, capability)
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class IrcUser(object):
"""This class holds the capabilities and authentications for a user.
"""
def __init__(self, ignore=False, password='', name='',
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capabilities=(), hostmasks=None):
self.auth = None # The (time, hostmask) a user authenticated under
self.name = name # The name of the user.
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self.ignore = ignore # A boolean deciding if the person is ignored.
self.password = password # password (plaintext? hashed?)
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self.capabilities = UserCapabilitySet()
for capability in capabilities:
self.capabilities.add(capability)
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if hostmasks is None:
self.hostmasks = [] # A list of hostmasks used for recognition
else:
self.hostmasks = hostmasks
def __repr__(self):
return '%s(ignore=%s, password=%r, name=%r, '\
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'capabilities=%r, hostmasks=%r)\n' %\
(self.__class__.__name__, self.ignore, self.password,
self.name, self.capabilities, self.hostmasks)
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def addCapability(self, capability):
self.capabilities.add(capability)
def removeCapability(self, capability):
if capability in self.capabilities:
self.capabilities.remove(capability)
def checkCapability(self, capability):
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if self.ignore:
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if isAntiCapability(capability):
return True
else:
return False
else:
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return self.capabilities.check(capability)
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def setPassword(self, password):
self.password = password
def checkPassword(self, password):
return (self.password == password)
def checkHostmask(self, hostmask):
if self.auth and (hostmask == self.auth[1]):
return True
for pat in self.hostmasks:
if ircutils.hostmaskPatternEqual(pat, hostmask):
return True
return False
def addHostmask(self, hostmask):
self.hostmasks.append(hostmask)
def removeHostmask(self, hostmask):
self.hostmasks.remove(hostmask)
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def hasHostmask(self, hostmask):
return hostmask in self.hostmasks
def setAuth(self, hostmask):
self.auth = (time.time(), hostmask)
def unsetAuth(self):
self.auth = None
def checkAuth(self, hostmask):
if self.auth is not None:
(timeSet, prefix) = self.auth
if time.time() - timeSet < 3600:
if hostmask == prefix:
return True
else:
return False
else:
self.unsetAuth()
return False
else:
return False
class IrcChannel(object):
"""This class holds the capabilities, bans, and ignores of a channel.
"""
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defaultOff = ('op', 'halfop', 'voice', 'protected')
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def __init__(self, bans=None, ignores=None, capabilities=None,
lobotomized=False, defaultAllow=True):
self.defaultAllow = defaultAllow
if bans is None:
self.bans = []
else:
self.bans = bans
if ignores is None:
self.ignores = []
else:
self.ignores = ignores
if capabilities is None:
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self.capabilities = CapabilitySet()
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else:
self.capabilities = capabilities
for capability in self.defaultOff:
if capability not in self.capabilities:
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self.capabilities.add(makeAntiCapability(capability))
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self.lobotomized = lobotomized
def __repr__(self):
return '%s(bans=%r, ignores=%r, capabilities=%r, '\
'lobotomized=%r, defaultAllow=%s)\n' %\
(self.__class__.__name__, self.bans, self.ignores,
self.capabilities, self.lobotomized,
self.defaultAllow)
def addBan(self, hostmask):
self.bans.append(hostmask)
def removeBan(self, hostmask):
self.bans = [s for s in self.bans if s != hostmask]
def checkBan(self, hostmask):
for pat in self.bans:
if ircutils.hostmaskPatternEqual(pat, hostmask):
return True
return False
def addIgnore(self, hostmask):
self.ignores.append(hostmask)
def removeIgnore(self, hostmask):
self.ignores = [s for s in self.ignores if s != hostmask]
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def addCapability(self, capability):
self.capabilities.add(capability)
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def removeCapability(self, capability):
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self.capabilities.remove(capability)
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def setDefaultCapability(self, b):
self.defaultAllow = b
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def checkCapability(self, capability):
if capability in self.capabilities:
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return self.capabilities.check(capability)
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else:
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if isAntiCapability(capability):
return not self.defaultAllow
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else:
return self.defaultAllow
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def checkIgnored(self, hostmask):
if self.lobotomized:
return True
for mask in self.bans:
if ircutils.hostmaskPatternEqual(mask, hostmask):
return True
for mask in self.ignores:
if ircutils.hostmaskPatternEqual(mask, hostmask):
return True
return False
class UsersDB(object):
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"""A simple serialized-to-file User Database."""
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def __init__(self, filename):
self.filename = filename
if os.path.exists(filename):
fd = file(filename, 'r')
s = fd.read()
fd.close()
IrcSet = ircutils.IrcSet
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(self.nextId, self.users) = eval(_normalize(s))
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else:
self.nextId = 1
self.users = [IrcUser(capabilities=['owner'],
password=utils.mktemp())]
self._nameCache = {}
self._hostmaskCache = {}
def reload(self):
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"""Reloads the database from its file."""
self.__init__(self.filename)
def flush(self):
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"""Flushes the database to its file."""
fd = file(self.filename, 'w')
fd.write(repr((self.nextId, self.users)))
fd.close()
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def getUserId(self, s):
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"""Returns the user ID of a given name or hostmask."""
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if ircutils.isUserHostmask(s):
try:
return self._hostmaskCache[s]
except KeyError:
ids = []
for (id, user) in enumerate(self.users):
if user is None:
continue
if user.checkHostmask(s):
ids.append(id)
if len(ids) == 1:
id = ids[0]
self._hostmaskCache[s] = id
self._hostmaskCache.setdefault(id, sets.Set()).add(s)
return id
elif len(ids) == 0:
raise KeyError, s
else:
raise ValueError, 'Ids %r matched.' % ids
else: # Not a hostmask, must be a name.
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s = s.lower()
try:
return self._nameCache[s]
except KeyError:
for (id, user) in enumerate(self.users):
if user is None:
continue
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if s == user.name.lower():
self._nameCache[s] = id
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self._nameCache[id] = s
return id
else:
raise KeyError, s
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def getUser(self, id):
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"""Returns a user given its id, name, or hostmask."""
if not isinstance(id, int):
# Must be a string. Get the UserId first.
id = self.getUserId(id)
try:
ret = self.users[id]
if ret is None:
raise KeyError, id
return ret
except IndexError:
raise KeyError, id
def hasUser(self, id):
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"""Returns the database has a user given its id, name, or hostmask."""
try:
self.getUser(id)
return True
except KeyError:
return False
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def setUser(self, id, user):
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"""Sets a user (given its id) to the IrcUser given it."""
assert isinstance(id, int), 'setUser takes an integer userId.'
if not 0 <= id < len(self.users) or self.users[id] is None:
raise KeyError, id
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try:
if self.getUserId(user.name) != id:
raise ValueError, \
'%s is already registered to someone else.' % user.name
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except KeyError:
pass
for hostmask in user.hostmasks:
try:
if self.getUserId(hostmask) != id:
raise ValueError, \
'%s is already registered to someone else.'% hostmask
except KeyError:
continue
if id in self._nameCache:
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del self._nameCache[self._nameCache[id]]
del self._nameCache[id]
if id in self._hostmaskCache:
for hostmask in self._hostmaskCache[id]:
del self._hostmaskCache[hostmask]
del self._hostmaskCache[id]
### FIXME: what if the new hostmasks overlap with another hostmask?
self.users[id] = user
def delUser(self, id):
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"""Removes a user from the database."""
if not 0 <= id < len(self.users) or self.users[id] is None:
raise KeyError, id
self.users[id] = None
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if id in self._nameCache:
del self._nameCache[self._nameCache[id]]
del self._nameCache[id]
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if id in self._hostmaskCache:
for hostmask in self._hostmaskCache[id]:
del self._hostmaskCache[hostmask]
del self._hostmaskCache[id]
def newUser(self):
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"""Allocates a new user in the database and returns it and its id."""
user = IrcUser()
id = self.nextId
self.nextId += 1
self.users.append(user)
return (id, user)
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class ChannelsDictionary(object):
def __init__(self, filename):
self.filename = filename
if os.path.exists(filename):
fd = file(filename, 'r')
s = fd.read()
fd.close()
Set = sets.Set
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self.dict = eval(_normalize(s))
else:
self.dict = {}
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def getChannel(self, channel):
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"""Returns an IrcChannel object for the given channel."""
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channel = channel.lower()
if channel in self.dict:
return self.dict[channel]
else:
c = IrcChannel()
self.dict[channel] = c
return c
def setChannel(self, channel, ircChannel):
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"""Sets a given channel to the IrcChannel object given."""
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channel = channel.lower()
self.dict[channel] = ircChannel
def flush(self):
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"""Flushes the channel database to its file."""
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fd = file(self.filename, 'w')
fd.write(repr(self.dict))
fd.close()
def reload(self):
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"""Reloads the channel database from its file."""
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self.__init__(self.filename)
###
# Later, I might add some special handling for botnet.
###
users = UsersDB(os.path.join(conf.confDir, conf.userfile))
channels = ChannelsDictionary(os.path.join(conf.confDir, conf.channelfile))
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world.flushers.append(users.flush)
world.flushers.append(channels.flush)
###
# Useful functions for checking credentials.
###
def checkIgnored(hostmask, recipient='', users=users, channels=channels):
"""checkIgnored(hostmask, recipient='') -> True/False
Checks if the user is ignored by the recipient of the message.
"""
for ignore in conf.ignores:
if ircutils.hostmaskPatternEqual(ignore, hostmask):
return True
try:
id = users.getUserId(hostmask)
user = users.getUser(id)
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except KeyError:
# If there's no user...
if ircutils.isChannel(recipient):
channel = channels.getChannel(recipient)
return channel.checkIgnored(hostmask)
else:
return conf.defaultIgnore
if user.checkCapability('owner'):
# Owners shouldn't ever be ignored.
return False
elif user.ignore:
return True
elif recipient:
if ircutils.isChannel(recipient):
channel = channels.getChannel(recipient)
return channel.checkIgnored(hostmask)
else:
return False
else:
return False
def _x(capability, ret):
if isAntiCapability(capability):
return not ret
else:
return ret
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def checkCapability(hostmask, capability, users=users, channels=channels):
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"""Checks that the user specified by name/hostmask has the capabilty given.
"""
#debug.printf('*** checking %s for %s' % (hostmask, capability))
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if world.startup:
#debug.printf('world.startup is active.')
return _x(capability, True)
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try:
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u = users.getUser(hostmask)
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except KeyError:
#debug.printf('user could not be found.')
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if isChannelCapability(capability):
#debug.printf('isChannelCapability true.')
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(channel, capability) = fromChannelCapability(capability)
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try:
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c = channels.getChannel(channel)
if capability in c.capabilities:
#debug.printf('capability in c.capabilities')
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return c.checkCapability(capability)
else:
#debug.printf('capability not in c.capabilities')
return _x(capability, c.defaultAllow)
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except KeyError:
#debug.printf('no such channel %s' % channel)
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pass
if capability in conf.defaultCapabilities:
#debug.printf('capability in conf.defaultCapability')
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return True
elif invertCapability(capability) in conf.defaultCapabilities:
#debug.printf('inverse capability in conf.defaultCapability')
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return False
else:
#debug.printf('returning appropriate value given no good reason')
return _x(capability, conf.defaultAllow)
#debug.printf('user found.')
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if capability in u.capabilities:
#debug.printf('found capability in u.capabilities.')
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return u.checkCapability(capability)
else:
if isChannelCapability(capability):
#debug.printf('isChannelCapability true, user found too.')
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(channel, capability) = fromChannelCapability(capability)
try:
chanop = makeChannelCapability(channel, 'op')
if u.checkCapability(chanop):
return _x(capability, True)
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except KeyError:
pass
c = channels.getChannel(channel)
if capability in c.capabilities:
#debug.printf('capability in c.capabilities')
return c.checkCapability(capability)
else:
#debug.printf('capability not in c.capabilities')
return _x(capability, c.defaultAllow)
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if capability in conf.defaultCapabilities:
#debug.printf('capability in conf.defaultCapabilities')
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return True
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elif invertCapability(capability) in conf.defaultCapabilities:
#debug.printf('inverse capability in conf.defaultCapabilities')
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return False
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else:
#debug.printf('returning appropriate value given no good reason')
return _x(capability, conf.defaultAllow)
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def checkCapabilities(hostmask, capabilities, requireAll=False):
"""Checks that a user has capabilities in a list.
requireAll is the True if *all* capabilities in the list must be had, False
if *any* of the capabilities in the list must be had.
"""
for capability in capabilities:
if requireAll:
if not checkCapability(hostmask, capability):
return False
else:
if checkCapability(hostmask, capability):
return True
if requireAll:
return True
else:
return False
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: