diff -r f4956b4ceba1 -r 011066435e6f VirtualMailManager/alias.py --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/VirtualMailManager/alias.py Wed Jul 28 02:08:03 2010 +0000 @@ -0,0 +1,164 @@ +# -*- coding: UTF-8 -*- +# Copyright (c) 2007 - 2010, 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 +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' doesn't 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(EmailAddress(dest[0]) 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"""Can't 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"""Can't 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 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' doesn't exist.") % self._addr, + NO_SUCH_ALIAS) + if not destination in self._dests: + raise AErr(_(u"The address '%(addr)s' isn't a destination of " + u"the alias '%(alias)s'.") % {'addr': self._addr, + 'alias': destination}, 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' doesn't 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' doesn't exist.") % self._addr, + NO_SUCH_ALIAS) + self.__delete() + del self._dests[:] + +del _, cfg_dget