#!/usr/bin/env python

# -*- coding: UTF-8 -*-

# Copyright 2007-2008 VEB IT

# See COPYING for distribution information.

# $Id$

"""Virtual Mail Manager's Alias class to manage e-mail aliases."""

from constants.VERSION import VERSION

__author__ = 'Pascal Volk <p.volk@veb-it.de>'

__version__ = VERSION

__revision__ = 'rev '+'$Rev$'.split()[1]

__date__ = '$Date$'.split()[1]

from Exceptions import VMMAliasException

from Domain import Domain

import constants.ERROR as ERR

class Alias:

    """Class to manage e-mail accounts."""

    def __init__(self, dbh, address, destination=None):

        if address == destination:

            raise VMMAliasException(('Address and destination are identical.',

                ERR.ALIAS_ADDR_DEST_IDENTICAL))

        self._dbh = dbh

        self._addr = address

        self._dest = destination

        self._localpart = None

        self._gid = 0

        self._isNew = False

        self._setAddr()

        if not self._dest is None:

            self._exists()

        if self._isAccount():

            raise VMMAliasException(

            ('There is already an account with address »%s«' % self._addr,

                ERR.ACCOUNT_EXISTS))

    def _exists(self):

        dbc = self._dbh.cursor()

        dbc.execute("SELECT gid FROM alias WHERE gid=%s AND address=%s\

 AND destination=%s", self._gid, self._localpart, self._dest)

        gid = dbc.fetchone()

        dbc.close()

        if gid is None:

            self._isNew = True

        else:

            self._isNew = False

    def _isAccount(self):

        dbc = self._dbh.cursor()

        dbc.execute("SELECT uid FROM users WHERE gid=%s AND local_part=%s",

                self._gid, self._localpart)

        uid = dbc.fetchone()

        dbc.close()

        if uid is not None:

            return True

        else:

            return False

    def _setAddr(self):

        self._localpart, d = self._addr.split('@')

        dom = Domain(self._dbh, d)

        self._gid = dom.getID()

        if self._gid == 0:

            raise VMMAliasException(("Domain »%s« doesn't exist." % d,

                ERR.NO_SUCH_DOMAIN))

    def save(self):

        if self._dest is None:

           raise VMMAliasException(('No destination address for alias denoted.',

               ERR.ALIAS_MISSING_DEST))

        if self._isNew:

            dbc = self._dbh.cursor()

            dbc.execute("INSERT INTO alias (gid, address, destination) VALUES\

 (%s, %s, %s)", self._gid, self._localpart, self._dest)

            self._dbh.commit()

            dbc.close()

        else:

            raise VMMAliasException(("Alias already exists.", ERR.ALIAS_EXISTS))

    def getInfo(self):

        dbc = self._dbh.cursor()

        dbc.execute('SELECT destination FROM alias WHERE gid=%s AND address=%s',

                self._gid, self._localpart)

        destinations = dbc.fetchall()

        dbc.close()

        if len(destinations) > 0:

            targets = []

            for destination in destinations:

                targets.append(destination[0])

            return targets

        else:

            raise VMMAliasException(("Alias doesn't exists", ERR.NO_SUCH_ALIAS))

    def delete(self):

        dbc = self._dbh.cursor()

        if self._dest is None:

            dbc.execute("DELETE FROM alias WHERE gid=%s AND address=%s",

                    self._gid, self._localpart)

        else:

            dbc.execute("DELETE FROM alias WHERE gid=%s AND address=%s AND \

 destination=%s", self._gid, self._localpart, self._dest)

        rowcount = dbc.rowcount

        dbc.close()

        if rowcount > 0:

            self._dbh.commit()

        else:

            raise VMMAliasException(("Alias doesn't exists", ERR.NO_SUCH_ALIAS))