VirtualMailManager/Alias.py
author Pascal Volk <neverseen@users.sourceforge.net>
Fri, 04 Sep 2009 20:27:39 +0000
changeset 142 28f26f7f3d8f
parent 138 617f27715b01
child 144 4c6aa6c29dd7
permissions -rw-r--r--
Reduced the mixing/concatenating of str and unicode objects. Optimized list generation in Domain class.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2007 - 2009, VEB IT
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# See COPYING for distribution information.
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"""Virtual Mail Manager's Alias class to manage e-mail aliases."""
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from __main__ import ERR
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from Exceptions import VMMAliasException as VMMAE
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from Domain import Domain
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from EmailAddress import EmailAddress
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import VirtualMailManager as VMM
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class Alias(object):
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    """Class to manage e-mail aliases."""
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    __slots__ = ('_addr', '_dest', '_gid', '_isNew', '_dbh')
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    def __init__(self, dbh, address, destination=None):
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        if isinstance(address, EmailAddress):
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            self._addr = address
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        else:
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            raise TypeError("Argument 'address' is not an EmailAddress")
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        if destination is None:
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            self._dest = None
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        elif isinstance(destination, EmailAddress):
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            self._dest = destination
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        else:
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            raise TypeError("Argument 'destination' is not an EmailAddress")
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        if address == destination:
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            raise VMMAE(_(u"Address and destination are identical."),
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                ERR.ALIAS_ADDR_DEST_IDENTICAL)
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        self._dbh = dbh
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        self._gid = 0
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        self._isNew = False
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        self._setAddr()
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        if not self._dest is None:
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            self._exists()
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        if self._isNew and VMM.VirtualMailManager.accountExists(self._dbh,
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                self._addr):
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            raise VMMAE(_(u"There is already an account with address “%s”.") %\
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                    self._addr, ERR.ACCOUNT_EXISTS)
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        if self._isNew and VMM.VirtualMailManager.relocatedExists(self._dbh,
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                self._addr):
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            raise VMMAE(
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              _(u"There is already a relocated user with the address “%s”.") %\
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                    self._addr, ERR.RELOCATED_EXISTS)
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    def _exists(self):
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        dbc = self._dbh.cursor()
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        dbc.execute("SELECT gid FROM alias WHERE gid=%s AND address=%s\
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 AND destination=%s", self._gid, self._addr._localpart, str(self._dest))
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        gid = dbc.fetchone()
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        dbc.close()
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        if gid is None:
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            self._isNew = True
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    def _setAddr(self):
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        dom = Domain(self._dbh, self._addr._domainname)
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        self._gid = dom.getID()
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        if self._gid == 0:
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            raise VMMAE(_(u"The domain “%s” doesn't exist yet.") %\
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                    self._addr._domainname, ERR.NO_SUCH_DOMAIN)
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    def _checkExpansion(self, limit):
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT count(gid) FROM alias where gid=%s AND address=%s',
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                self._gid, self._addr._localpart)
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        curEx = dbc.fetchone()[0]
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        dbc.close()
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        if curEx == limit:
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            errmsg = _(u"""Can't add new destination to alias “%(address)s”.
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Currently this alias expands into %(count)i recipients.
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One more destination will render this alias unusable.
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Hint: Increase Postfix' virtual_alias_expansion_limit
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""") % {'address': self._addr, 'count': curEx}
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            raise VMMAE(errmsg, ERR.ALIAS_EXCEEDS_EXPANSION_LIMIT)
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    def save(self, expansion_limit):
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        if self._dest is None:
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           raise VMMAE(_(u"No destination address for alias denoted."),
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               ERR.ALIAS_MISSING_DEST)
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        if self._isNew:
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            self._checkExpansion(expansion_limit)
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            dbc = self._dbh.cursor()
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            dbc.execute("INSERT INTO alias (gid, address, destination) VALUES\
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 (%s, %s, %s)", self._gid, self._addr._localpart, str(self._dest))
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            self._dbh.commit()
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            dbc.close()
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        else:
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            raise VMMAE(
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               _(u"The alias “%(a)s” with destination “%(d)s” already exists.")\
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                       % {'a': self._addr, 'd': self._dest}, ERR.ALIAS_EXISTS)
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    def getInfo(self):
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT destination FROM alias WHERE gid=%s AND address=%s',
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                self._gid, self._addr._localpart)
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        destinations = dbc.fetchall()
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        dbc.close()
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        if len(destinations) > 0:
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            targets = []
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            for destination in destinations:
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                targets.append(destination[0])
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            return targets
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        else:
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            raise VMMAE(_(u"The alias “%s” doesn't exists.") % self._addr,
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                    ERR.NO_SUCH_ALIAS)
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    def delete(self):
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        dbc = self._dbh.cursor()
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        if self._dest is None:
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            dbc.execute("DELETE FROM alias WHERE gid=%s AND address=%s",
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                    self._gid, self._addr._localpart)
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        else:
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            dbc.execute("DELETE FROM alias WHERE gid=%s AND address=%s AND \
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 destination=%s", self._gid, self._addr._localpart, str(self._dest))
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        rowcount = dbc.rowcount
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        dbc.close()
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        if rowcount > 0:
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            self._dbh.commit()
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        else:
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            if self._dest is None:
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                msg = _(u"The alias “%s” doesn't exists.") % self._addr
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            else:
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                msg = _(u"The alias “%(a)s” with destination “%(d)s” doesn't\
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 exists.") % {'a': self._addr, 'd': self._dest}
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            raise VMMAE(msg, ERR.NO_SUCH_ALIAS)
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