+
−# -*- coding: UTF-8 -*-
+
−# Copyright (c) 2007 - 2011, Pascal Volk
+
−# See COPYING for distribution information.
+
−"""
+
−    VirtualMailManager.alias
+
−    ~~~~~~~~~~~~~~~~~~~~~~~~
+
−
+
−    Virtual Mail Manager's Alias class to manage e-mail aliases.
+
−"""
+
−
+
−from VirtualMailManager.domain import get_gid
+
−from VirtualMailManager.emailaddress import \
+
−     EmailAddress, DestinationEmailAddress as DestAddr
+
−from VirtualMailManager.errors import AliasError as AErr
+
−from VirtualMailManager.ext.postconf import Postconf
+
−from VirtualMailManager.pycompat import all
+
−from VirtualMailManager.constants import \
+
−     ALIAS_EXCEEDS_EXPANSION_LIMIT, NO_SUCH_ALIAS, NO_SUCH_DOMAIN
+
−
+
−
+
−_ = lambda msg: msg
+
−cfg_dget = lambda option: None
+
−
+
−
+
−class Alias(object):
+
−    """Class to manage e-mail aliases."""
+
−    __slots__ = ('_addr', '_dests', '_gid', '_dbh')
+
−
+
−    def __init__(self, dbh, address):
+
−        assert isinstance(address, EmailAddress)
+
−        self._addr = address
+
−        self._dbh = dbh
+
−        self._gid = get_gid(self._dbh, self._addr.domainname)
+
−        if not self._gid:
+
−            raise AErr(_(u"The domain '%s' does not exist.") %
+
−                       self._addr.domainname, NO_SUCH_DOMAIN)
+
−        self._dests = []
+
−
+
−        self._load_dests()
+
−
+
−    def _load_dests(self):
+
−        """Loads all known destination addresses into the _dests list."""
+
−        dbc = self._dbh.cursor()
+
−        dbc.execute('SELECT destination FROM alias WHERE gid = %s AND '
+
−                    'address = %s', (self._gid, self._addr.localpart))
+
−        dests = dbc.fetchall()
+
−        if dbc.rowcount > 0:
+
−            self._dests.extend(DestAddr(dest[0], self._dbh) for dest in dests)
+
−        dbc.close()
+
−
+
−    def _check_expansion(self, count_new):
+
−        """Checks the current expansion limit of the alias."""
+
−        postconf = Postconf(cfg_dget('bin.postconf'))
+
−        limit = long(postconf.read('virtual_alias_expansion_limit'))
+
−        dcount = len(self._dests)
+
−        failed = False
+
−        if dcount == limit or dcount + count_new > limit:
+
−            failed = True
+
−            errmsg = _(
+
−u"""Cannot add %(count_new)i new destination(s) to alias '%(address)s'.
+
−Currently this alias expands into %(count)i/%(limit)i recipients.
+
−%(count_new)i additional destination(s) will render this alias unusable.
+
−Hint: Increase Postfix' virtual_alias_expansion_limit""")
+
−        elif dcount > limit:
+
−            failed = True
+
−            errmsg = _(
+
−u"""Cannot add %(count_new)i new destination(s) to alias '%(address)s'.
+
−This alias already exceeds its expansion limit (%(count)i/%(limit)i).
+
−So its unusable, all messages addressed to this alias will be bounced.
+
−Hint: Delete some destination addresses.""")
+
−        if failed:
+
−            raise AErr(errmsg % {'address': self._addr, 'count': dcount,
+
−                                 'limit': limit, 'count_new': count_new},
+
−                       ALIAS_EXCEEDS_EXPANSION_LIMIT)
+
−
+
−    def _delete(self, destination=None):
+
−        """Deletes a destination from the alias, if ``destination`` is
+
−        not ``None``.  If ``destination`` is None, the alias with all
+
−        its destination addresses will be deleted.
+
−
+
−        """
+
−        dbc = self._dbh.cursor()
+
−        if not destination:
+
−            dbc.execute('DELETE FROM alias WHERE gid = %s AND address = %s',
+
−                        (self._gid, self._addr.localpart))
+
−        else:
+
−            dbc.execute('DELETE FROM alias WHERE gid = %s AND address = %s '
+
−                        'AND destination = %s',
+
−                        (self._gid, self._addr.localpart, str(destination)))
+
−        if dbc.rowcount > 0:
+
−            self._dbh.commit()
+
−        dbc.close()
+
−
+
−    def __len__(self):
+
−        """Returns the number of destinations of the alias."""
+
−        return len(self._dests)
+
−
+
−    @property
+
−    def address(self):
+
−        """The Alias' EmailAddress instance."""
+
−        return self._addr
+
−
+
−    def add_destinations(self, destinations, warnings=None):
+
−        """Adds the `EmailAddress`es from *destinations* list to the
+
−        destinations of the alias.
+
−
+
−        Destinations, that are already assigned to the alias, will be
+
−        removed from *destinations*.  When done, this method will return
+
−        a set with all destinations, that were saved in the database.
+
−        """
+
−        destinations = set(destinations)
+
−        assert destinations and \
+
−                all(isinstance(dest, EmailAddress) for dest in destinations)
+
−        if not warnings is None:
+
−            assert isinstance(warnings, list)
+
−        if self._addr in destinations:
+
−            destinations.remove(self._addr)
+
−            if not warnings is None:
+
−                warnings.append(self._addr)
+
−        duplicates = destinations.intersection(set(self._dests))
+
−        if duplicates:
+
−            destinations.difference_update(set(self._dests))
+
−            if not warnings is None:
+
−                warnings.extend(duplicates)
+
−        if not destinations:
+
−            return destinations
+
−        self._check_expansion(len(destinations))
+
−        dbc = self._dbh.cursor()
+
−        dbc.executemany("INSERT INTO alias (gid, address, destination) "
+
−                        "VALUES (%d, '%s', %%s)" % (self._gid,
+
−                                                    self._addr.localpart),
+
−                        ((str(destination),) for destination in destinations))
+
−        self._dbh.commit()
+
−        dbc.close()
+
−        self._dests.extend(destinations)
+
−        return destinations
+
−
+
−    def del_destination(self, destination):
+
−        """Deletes the specified ``destination`` address from the alias."""
+
−        assert isinstance(destination, EmailAddress)
+
−        if not self._dests:
+
−            raise AErr(_(u"The alias '%s' does not exist.") % self._addr,
+
−                       NO_SUCH_ALIAS)
+
−        if not destination in self._dests:
+
−            raise AErr(_(u"The address '%(addr)s' is not a destination of "
+
−                         u"the alias '%(alias)s'.") % {'addr': destination,
+
−                       'alias': self._addr}, NO_SUCH_ALIAS)
+
−        self._delete(destination)
+
−        self._dests.remove(destination)
+
−
+
−    def get_destinations(self):
+
−        """Returns an iterator for all destinations of the alias."""
+
−        if not self._dests:
+
−            raise AErr(_(u"The alias '%s' does not exist.") % self._addr,
+
−                       NO_SUCH_ALIAS)
+
−        return iter(self._dests)
+
−
+
−    def delete(self):
+
−        """Deletes the alias with all its destinations."""
+
−        if not self._dests:
+
−            raise AErr(_(u"The alias '%s' does not exist.") % self._addr,
+
−                       NO_SUCH_ALIAS)
+
−        self._delete()
+
−        del self._dests[:]
+
−
+
−del _, cfg_dget