#!/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)
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# POSSIBILITY OF SUCH DAMAGE.
###

"""
Provides commands available only on Unix.
"""

from baseplugin import *

import os
import re
import pwd
import crypt
import errno
import random
import struct
import popen2


import privmsgs
import callbacks
import utils

def configure(onStart, afterConnect, advanced):
    from questions import expect, anything, something, yn
    onStart.append('load Unix')
    spellCmd = utils.findBinaryInPath('aspell')
    if not spellCmd:
        cmdLine = utils.findBinaryInPath('ispell')
    if not spellCmd:
        print 'NOTE: I couldn\'t find aspell or ispell in your path,'
        print 'so that function of this module will not work.  You may'
        print 'choose to install it later.  To re-enable this command then, '
        print 'remove the "disable spell" line from your configuration file.'
        onStart.append('disable spell')
    fortuneCmd = utils.findBinaryInPath('fortune')
    if not fortuneCmd:
        print 'NOTE: I couldn\'t find fortune in your path, so that function '
        print 'of this module will not work.  You may choose to install it '
        print 'later.  To re-enable this command then, remove the '
        print '"disable fortune" command from your configuration file.'
        onStart.append('disable fortune')

    print 'The "progstats" command can reveal potentially sensitive'
    print 'information about your machine.  Here\'s an example of its output:'
    print
    print progstats()
    print
    if yn('Would you like to disable this command?') == 'y':
        onStart.append('disable progstats')

example = utils.wrapLines("""
<jemfinch> @list Unix
<supybot> crypt, errno, fortune, progstats, spell
<jemfinch> @crypt jemfinch
<supybot> XJsAYQVv6ACAs
<jemfinch> @help crypt
<supybot> crypt <password> [<salt>] (for more help use the morehelp command)
<jemfinch> @crypt jemfinch XXX
<supybot> XXU51Sc5CjpkY
<jemfinch> @errno ENOMEM
<supybot> ENOMEM (#12): Cannot allocate memory
<jemfinch> @errno 11
<supybot> EAGAIN (#11): Resource temporarily unavailable
<jemfinch> @fortune
<supybot> Q: What's the difference between Bell Labs and the Boy Scouts of America? A: The Boy Scouts have adult supervision.
<jemfinch> @progstats
<supybot> Process ID 1264 running as user "jfincher" and as group "1000" from directory "/home/jfincher/src/my/python/supybot" with the command line "src/bot.py conf/supybot.conf".  Running on Python 2.3+ (#2, Aug 10 2003, 11:33:47) [GCC 3.3.1 (Debian)].
<jemfinch> @spell recind
<supybot> Possible spellings for "recind" (26 found, 26 shown): rescind, rec ind, rec-ind, resined, rebind, remind, rewind, recent, resend, rescinds, rescinder, reined, resound, rezoned, rend, rind, reascend, recited, refined, refund, relined, repined, resins, resin, rosined, reckoned.
""")

def progstats():
    pw = pwd.getpwuid(os.getuid())
    response = 'Process ID %i running as user "%s" and as group "%s" '\
               'from directory "%s" with the command line "%s".  '\
               'Running on Python %s.' %\
               (os.getpid(), pw[0], pw[3],
                os.getcwd(), " ".join(sys.argv),
                sys.version.translate(string.ascii, '\r\n'))
    return response


class Unix(callbacks.Privmsg):
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        # Initialize a file descriptor for the spell module.
        spellCmd = utils.findBinaryInPath('aspell')
        if not spellCmd:
            spellCmd = utils.findBinaryInPath('ispell')
        (self._spellRead, self._spellWrite) = popen2.popen4([spellCmd, '-a'],0)
        self._spellRead.readline() # Ignore the banner.
        self.fortuneCmd = utils.findBinaryInPath('fortune')

    def die(self):
        # close the filehandles
        for h in (self._spellRead, self._spellWrite):
            h.close()

    def errno(self, irc, msg, args):
        """<error number or code>

        Returns the number of an errno code, or the errno code of a number.
        """
        s = privmsgs.getArgs(args)
        try:
            i = int(s)
            name = errno.errorcode[i]
        except ValueError:
            name = s.upper()
            try:
                i = getattr(errno, name)
            except AttributeError:
                irc.reply(msg, 'I can\'t find the errno number for that code.')
                return
        except KeyError:
            name = '(unknown)'
        irc.reply(msg, '%s (#%s): %s' % (name, i, os.strerror(i)))

    def progstats(self, irc, msg, args):
        """takes no arguments

        Returns various unix-y information on the running supybot process.
        """
        irc.reply(msg, progstats())

    _cryptre = re.compile(r'[./0-9A-Za-z]')
    def crypt(self, irc, msg, args):
        """<password> [<salt>]

        Returns the resulting of doing a crypt() on <password>  If <salt> is
        not given, uses a random salt.  If running on a glibc2 system,
        prepending '$1$' to your salt will cause crypt to return an MD5sum
        based crypt rather than the standard DES based crypt.
        """
        def makeSalt():
            s = '\x00'
            while self._cryptre.sub('', s) != '':
                s = struct.pack('<h', random.randrange(2**16))
            return s
        (password, salt) = privmsgs.getArgs(args, optional=1)
        if salt == '':
            salt = makeSalt()
        irc.reply(msg, crypt.crypt(password, salt))

    def spell(self, irc, msg, args):
        """<word>

        Returns the result of passing <word> to aspell/ispell.  The results
        shown are sorted from best to worst in terms of being a likely match
        for the spelling of <word>.
        """
        # We are only checking the first word
        word = privmsgs.getArgs(args)
        if ' ' in word:
            irc.error(msg, 'Aspell/ispell can\'t handle spaces in words.')
            return
        self._spellWrite.write(word)
        self._spellWrite.write('\n')
        line = self._spellRead.readline()
        # aspell puts extra whitespace, ignore it
        while line == '\n':
            line = self._spellRead.readline()
        # parse the output
        if line[0] in '*+':
            resp = '"%s" may be spelled correctly.' % word
        elif line[0] == '#':
            resp = 'Could not find an alternate spelling for "%s"' % word
        elif line[0] == '&':
            matches = line.split(':')[1].strip()
            match_list = matches.split(', ')
            total = len(match_list)
            ircutils.shrinkList(match_list, ', ', 350)
            shown = len(match_list)
            resp = 'Possible spellings for "%s" (%d found, %d shown): %s.' % \
                (word, total, shown, ', '.join(match_list))
        else:
            resp = 'Something unexpected was seen in the [ai]spell output.'
        irc.reply(msg, resp)

    def fortune(self, irc, msg, args):
        """takes no arguments

        Returns a fortune from the *nix fortune program.
        """
        (r, w) = popen2.popen4('%s -s' % self.fortuneCmd)
        s = r.read()
        w.close()
        r.close()
        irc.reply(msg, ' '.join(s.split()))


Class = Unix
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