#!/usr/bin/env python

# -*- coding: utf-8 -*-

# Copyright 2009 Pascal Volk

__author__ = 'Pascal Volk'

__version__ = '0.1'

__date__ = '2009-06-07'

import os

import re

class NiXSpamPlot:

    """Do sth ..."""

    """Regular expression pattern for mail logs from Postfix"""

    RE_PF = '''^[\w\s:-]{17,80}\spostfix\/smtpd\[[\d]{3,5}\]: NOQUEUE: reject:.*blocked using ix.dnsbl.manitu.net; Spam sent to the mailhost ((?:[a-z0-9-]{1,63}\.){1,}[a-z]{2,6}) was detected by NiX Spam.*$'''

    def __init__(self):

        self._doms = {}

        self._mxs  = {}

        self._repo = None

    def setLogFormat(self, format='postfix'):

        if format == 'postfix':

            self._repo = re.compile(NiXSpamPlot.RE_PF)

        else:

            raise Exception('MTA/Logformat not supported yet.')

    def parseLog(self, filehandle):

        for l in filehandle:

            mo = self._repo.match(l)

            if mo:

                mx = mo.group(1)

                try:

                    self._mxs[mx] += 1

                except KeyError:

                    self._mxs[mx]  = 1

    def countByDom(self):

        for mx in self._mxs.keys():

            dom = '.'.join(mx.split('.')[-2:])

            try:

                self._doms[dom] += self._mxs[mx]

            except KeyError:

                self._doms[dom]  = self._mxs[mx]

    def getDomains(self):

        return self._doms

    def getMXs(self):

        return self._mxs

    def getTotal(self):

        return sum(self._mxs.values())

def getOptionParser():

    from optparse import OptionParser

    usage  = 'usage: %prog [options] maillog [maillog [...]]'

    parser = OptionParser(usage=usage, description='do something ...')

    parser.add_option('-d', action='store_true', dest='countByDom',

            default=False, help='summarize all MX by domain')

    parser.add_option('-m', action='store_false', dest='countByDom',

            help='count per MX host [default]')

    parser.add_option('-o', dest='oFormat', default='table',metavar='FORMAT',

            help='the output format: table or csv [default: %default]')

    parser.add_option('-p', action='store_true', dest='percent', default=False,

            help='show also percentages in table output [default: %default]')

    parser.add_option('-s', dest='order', default='name', metavar='SORTBY',

            help='arrange output by: name or count [default: %default]')

    parser.add_option('-t', dest='format', default='postfix',metavar='MTA',

            help='MTA that generated the maillog [default: %default]')

    return parser

def openLogFile(fname):

    try:

        fh = open(fname)

        return fh

    except IOError, e:

        os.sys.stderr.write('Warning: %s\nskipped file: %s\n' % (e.strerror,

            fname))

def showResult(nixspamplot, options):

    if options.countByDom:

        nixspamplot.countByDom()

        domains = nixspamplot.getDomains()

    else:

        domains = nixspamplot.getMXs()

    if options.percent:

        total   = nixspamplot.getTotal()

    k = 0 if options.order == 'name' else 1

    doms = sorted(domains.items(), lambda d,c: cmp(d[k],c[k]), reverse=k)

    for d in doms:

        print "%s -> %d" % d

def main():

    parser = getOptionParser()

    opts, args = parser.parse_args()

    if len(args) < 1:

        parser.error('No logfiles specified')

    nsp = NiXSpamPlot()

    nsp.setLogFormat(opts.format)

    for fn in args:

        fh = openLogFile(fn)

        if fh is not None:

            nsp.parseLog(fh)

            fh.close()

    showResult(nsp, opts)

if __name__ == '__main__':

    main()