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Limnoria/plugins/String/plugin.py
Daniel Folkinshteyn 37597bfe94 Create a commands.process function which runs a function inside a separate process.
This is the only way to limit the execution time of a possibly long-running python statement.
Use this on String.re, due to the possibility of pathologically long re matching in python.
This allows us to remove the 'trusted-only' restriction on string.re.
In the future, this should probably be used in other places that take user-supplied regexps,
such as 'misc last --regexp', for example, as well as other potentially long-running tasks
that can block the bot.

Conflicts:

	plugins/String/plugin.py
	src/commands.py
2011-08-15 17:24:33 +02:00

199 lines
7.3 KiB
Python

###
# Copyright (c) 2003-2005, Jeremiah Fincher
# Copyright (c) 2008-2009, James Vega
# 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.
###
import types
import binascii
import supybot.utils as utils
from supybot.commands import *
import supybot.commands as commands
import supybot.plugins as plugins
import supybot.ircutils as ircutils
import supybot.callbacks as callbacks
from supybot.i18n import PluginInternationalization, internationalizeDocstring
_ = PluginInternationalization('String')
import multiprocessing
class String(callbacks.Plugin):
@internationalizeDocstring
def ord(self, irc, msg, args, letter):
"""<letter>
Returns the 8-bit value of <letter>.
"""
irc.reply(str(ord(letter)))
ord = wrap(ord, ['letter'])
@internationalizeDocstring
def chr(self, irc, msg, args, i):
"""<number>
Returns the character associated with the 8-bit value <number>
"""
try:
irc.reply(chr(i))
except ValueError:
irc.error(_('That number doesn\'t map to an 8-bit character.'))
chr = wrap(chr, ['int'])
@internationalizeDocstring
def encode(self, irc, msg, args, encoding, text):
"""<encoding> <text>
Returns an encoded form of the given text; the valid encodings are
available in the documentation of the Python codecs module:
<http://docs.python.org/library/codecs.html#standard-encodings>.
"""
try:
irc.reply(text.encode(encoding).rstrip('\n'))
except LookupError:
irc.errorInvalid(_('encoding'), encoding)
encode = wrap(encode, ['something', 'text'])
@internationalizeDocstring
def decode(self, irc, msg, args, encoding, text):
"""<encoding> <text>
Returns an un-encoded form of the given text; the valid encodings are
available in the documentation of the Python codecs module:
<http://docs.python.org/library/codecs.html#standard-encodings>.
"""
try:
irc.reply(text.decode(encoding))
except LookupError:
irc.errorInvalid(_('encoding'), encoding)
except binascii.Error:
irc.errorInvalid(_('base64 string'),
s=_('Base64 strings must be a multiple of 4 in '
'length, padded with \'=\' if necessary.'))
decode = wrap(decode, ['something', 'text'])
@internationalizeDocstring
def levenshtein(self, irc, msg, args, s1, s2):
"""<string1> <string2>
Returns the levenshtein distance (also known as the "edit distance"
between <string1> and <string2>)
"""
max = self.registryValue('levenshtein.max')
if len(s1) > max or len(s2) > max:
irc.error(_('Levenshtein distance is a complicated algorithm, try '
'it with some smaller inputs.'))
else:
irc.reply(str(utils.str.distance(s1, s2)))
levenshtein = wrap(levenshtein, ['something', 'text'])
@internationalizeDocstring
def soundex(self, irc, msg, args, text, length):
"""<string> [<length>]
Returns the Soundex hash to a given length. The length defaults to
4, since that's the standard length for a soundex hash. For unlimited
length, use 0.
"""
irc.reply(utils.str.soundex(text, length))
soundex = wrap(soundex, ['somethingWithoutSpaces', additional('int', 4)])
@internationalizeDocstring
def len(self, irc, msg, args, text):
"""<text>
Returns the length of <text>.
"""
irc.reply(str(len(text)))
len = wrap(len, ['text'])
@internationalizeDocstring
def re(self, irc, msg, args, ff, text):
"""<regexp> <text>
If <regexp> is of the form m/regexp/flags, returns the portion of
<text> that matches the regexp. If <regexp> is of the form
s/regexp/replacement/flags, returns the result of applying such a
regexp to <text>.
"""
if isinstance(ff, (types.FunctionType, types.MethodType)):
f = ff
else:
f = lambda s: ff.search(s) and ff.search(s).group(0) or ''
if f('') and len(f(' ')) > len(f(''))+1: # Matches the empty string.
s = _('You probably don\'t want to match the empty string.')
irc.error(s)
else:
t = self.registryValue('re.timeout')
try:
v = commands.process(f, text, timeout=t, pn=self.name(), cn='re')
irc.reply(v)
except commands.ProcessTimeoutError, e:
irc.error("ProcessTimeoutError: %s" % (e,))
re = thread(wrap(re, [first('regexpMatcher', 'regexpReplacer'),
'text']))
@internationalizeDocstring
def xor(self, irc, msg, args, password, text):
"""<password> <text>
Returns <text> XOR-encrypted with <password>. See
http://www.yoe.org/developer/xor.html for information about XOR
encryption.
"""
chars = utils.iter.cycle(password)
ret = [chr(ord(c) ^ ord(chars.next())) for c in text]
irc.reply(''.join(ret))
xor = wrap(xor, ['something', 'text'])
@internationalizeDocstring
def md5(self, irc, msg, args, text):
"""<text>
Returns the md5 hash of a given string. Read
http://www.rsasecurity.com/rsalabs/faq/3-6-6.html for more information
about md5.
"""
irc.reply(utils.crypt.md5(text).hexdigest())
md5 = wrap(md5, ['text'])
@internationalizeDocstring
def sha(self, irc, msg, args, text):
"""<text>
Returns the SHA hash of a given string. Read
http://www.secure-hash-algorithm-md5-sha-1.co.uk/ for more information
about SHA.
"""
irc.reply(utils.crypt.sha(text).hexdigest())
sha = wrap(sha, ['text'])
Class = String
# vim:set shiftwidth=4 softtabstop=4 expandtab textwidth=79: