VirtualMailManager/catchall.py
author Pascal Volk <user@localhost.localdomain.org>
Sat, 08 Jun 2013 15:12:16 +0000 (2013-06-08)
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2012 martin f. krafft
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.catchall
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's CatchallAlias class to manage domain catch-all
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    aliases.
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    This is heavily based on (more or less a copy of) the Alias class, because
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    fundamentally, catchall aliases are aliases, but without a localpart.
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    While Alias could potentially derive from CatchallAlias to reuse some of
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    the functionality, it's probably not worth it. I found no sensible way to
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    derive CatchallAlias from Alias, or at least none that would harness the
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    powers of polymorphism.
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    Yet, we reuse the AliasError exception class, which makes sense.
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"""
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from VirtualMailManager.domain import get_gid
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from VirtualMailManager.emailaddress import \
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     EmailAddress, DestinationEmailAddress as DestAddr
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from VirtualMailManager.errors import AliasError as AErr
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from VirtualMailManager.ext.postconf import Postconf
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from VirtualMailManager.constants import \
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     ALIAS_EXCEEDS_EXPANSION_LIMIT, NO_SUCH_ALIAS, NO_SUCH_DOMAIN
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_ = lambda msg: msg
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cfg_dget = lambda option: None
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class CatchallAlias(object):
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    """Class to manage domain catch-all aliases."""
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    __slots__ = ('_domain', '_dests', '_gid', '_dbh')
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    def __init__(self, dbh, domain):
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        self._domain = domain
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        self._dbh = dbh
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        self._gid = get_gid(self._dbh, self.domain)
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        if not self._gid:
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            raise AErr(_("The domain '%s' does not exist.") %
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                       self.domain, NO_SUCH_DOMAIN)
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        self._dests = []
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        self._load_dests()
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    def _load_dests(self):
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        """Loads all known destination addresses into the _dests list."""
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT destination FROM catchall WHERE gid = %s',
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                    (self._gid,))
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        dests = dbc.fetchall()
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        if dbc.rowcount > 0:
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            self._dests.extend(DestAddr(dest[0], self._dbh) for dest in dests)
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        dbc.close()
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    def _check_expansion(self, count_new):
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        """Checks the current expansion limit of the alias."""
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        postconf = Postconf(cfg_dget('bin.postconf'))
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        limit = int(postconf.read('virtual_alias_expansion_limit'))
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        dcount = len(self._dests)
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        failed = False
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        if dcount == limit or dcount + count_new > limit:
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            failed = True
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            errmsg = _(
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"""Cannot add %(count_new)i new destination(s) to catch-all alias for
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domain '%(domain)s'. Currently this alias expands into %(count)i/%(limit)i
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recipients. %(count_new)i additional destination(s) will render this alias
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unusable.
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Hint: Increase Postfix' virtual_alias_expansion_limit""")
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        elif dcount > limit:
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            failed = True
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            errmsg = _(
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"""Cannot add %(count_new)i new destination(s) to catch-all alias for domain
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'%(domain)s'. This alias already exceeds its expansion limit \
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(%(count)i/%(limit)i).
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So its unusable, all messages addressed to this alias will be bounced.
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Hint: Delete some destination addresses.""")
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        if failed:
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            raise AErr(errmsg % {'domain': self._domain, 'count': dcount,
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                                 'limit': limit, 'count_new': count_new},
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                       ALIAS_EXCEEDS_EXPANSION_LIMIT)
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    def _delete(self, destinations=None):
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        """Delete one ore multiple destinations from the catchall alias, if
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        ``destinations`` is not ``None``.  If ``destinations`` is None, the
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        catchall alias with all its destination addresses will be deleted.
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        """
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        dbc = self._dbh.cursor()
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        if not destinations:
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            dbc.execute('DELETE FROM catchall WHERE gid = %s', (self._gid,))
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        else:
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            dbc.executemany('DELETE FROM catchall WHERE gid = %d AND '
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                            'destination = %%s' % self._gid,
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                            ((str(dest),) for dest in destinations))
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        if dbc.rowcount > 0:
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            self._dbh.commit()
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        dbc.close()
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    def __len__(self):
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        """Returns the number of destinations of the catchall alias."""
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        return len(self._dests)
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    @property
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    def domain(self):
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        """The Alias' domain."""
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        return self._domain
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    def add_destinations(self, destinations, warnings=None):
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        """Adds the `EmailAddress`es from *destinations* list to the
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        destinations of the catchall alias.
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        Destinations, that are already assigned to the alias, will be
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        removed from *destinations*.  When done, this method will return
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        a set with all destinations, that were saved in the database.
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        """
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        destinations = set(destinations)
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        assert destinations and \
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                all(isinstance(dest, EmailAddress) for dest in destinations)
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        if not warnings is None:
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            assert isinstance(warnings, list)
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        duplicates = destinations.intersection(set(self._dests))
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        if duplicates:
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            destinations.difference_update(set(self._dests))
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            if not warnings is None:
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                warnings.extend(duplicates)
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        if not destinations:
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            return destinations
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        self._check_expansion(len(destinations))
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        dbc = self._dbh.cursor()
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        dbc.executemany("INSERT INTO catchall (gid, destination) "
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                        "VALUES (%d, %%s)" % self._gid,
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                        ((str(destination),) for destination in destinations))
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        self._dbh.commit()
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        dbc.close()
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        self._dests.extend(destinations)
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        return destinations
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    def del_destinations(self, destinations, warnings=None):
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        """Deletes the specified ``destinations`` from the catchall alias."""
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        destinations = set(destinations)
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        assert destinations and \
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                all(isinstance(dest, EmailAddress) for dest in destinations)
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        if not warnings is None:
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            assert isinstance(warnings, list)
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        if not self._dests:
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            raise AErr(_("There are no catch-all aliases defined for "
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                         "domain '%s'.") % self._domain, NO_SUCH_ALIAS)
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        unknown = destinations.difference(set(self._dests))
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        if unknown:
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            destinations.intersection_update(set(self._dests))
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            if not warnings is None:
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                warnings.extend(unknown)
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        if not destinations:
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            raise AErr(_("No suitable destinations left to remove from the "
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                         "catch-all alias of domain '%s'.") % self._domain,
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                       NO_SUCH_ALIAS)
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        self._delete(destinations)
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        for destination in destinations:
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            self._dests.remove(destination)
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    def get_destinations(self):
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        """Returns an iterator for all destinations of the catchall alias."""
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        if not self._dests:
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            raise AErr(_("There are no catch-all aliases defined for "
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                         "domain '%s'.") % self._domain, NO_SUCH_ALIAS)
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        return iter(self._dests)
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    def delete(self):
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        """Deletes all catchall destinations for the domain."""
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        if not self._dests:
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            raise AErr(_("There are no catch-all aliases defined for "
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                         "domain '%s'.") % self._domain, NO_SUCH_ALIAS)
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        self._delete()
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        del self._dests[:]
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del _, cfg_dget