author | Pascal Volk <user@localhost.localdomain.org> |
Sat, 08 Jun 2013 15:12:16 +0000 (2013-06-08) | |
branch | v0.7.x |
changeset 698 | 18a528d44055 |
parent 643 | df1e3b67882a |
child 711 | 2a75058fc064 |
permissions | -rw-r--r-- |
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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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|
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Virtual Mail Manager's CatchallAlias class to manage domain catch-all |
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aliases. |
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|
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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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|
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Yet, we reuse the AliasError exception class, which makes sense. |
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""" |
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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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141 |
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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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164 |
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165 |
def get_destinations(self): |
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166 |
"""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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171 |
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172 |
def delete(self): |
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173 |
"""Deletes all catchall destinations for the domain.""" |
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174 |
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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177 |
self._delete() |
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178 |
del self._dests[:] |
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179 |
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180 |
del _, cfg_dget |