--- /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