VirtualMailManager/relocated.py
author Pascal Volk <user@localhost.localdomain.org>
Sun, 25 Nov 2012 14:37:09 +0000
branchv0.7.x
changeset 652 68d715ce6e1c
parent 643 df1e3b67882a
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2012, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.relocated
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's Relocated class to handle relocated users.
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"""
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from VirtualMailManager.domain import get_gid
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from VirtualMailManager.emailaddress import EmailAddress, \
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     DestinationEmailAddress
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from VirtualMailManager.errors import RelocatedError as RErr
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from VirtualMailManager.constants import DOMAIN_INVALID, NO_SUCH_DOMAIN, \
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     NO_SUCH_RELOCATED, RELOCATED_ADDR_DEST_IDENTICAL, RELOCATED_EXISTS
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_ = lambda msg: msg
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class Relocated(object):
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    """Class to handle e-mail addresses of relocated users."""
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    __slots__ = ('_addr', '_dest', '_gid', '_dbh')
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    def __init__(self, dbh, address):
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        """Creates a new *Relocated* instance.  The ``address`` is the
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        old e-mail address of the user.
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        Use `setDestination()` to set/update the new address, where the
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        user has moved to.
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        """
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        assert isinstance(address, EmailAddress)
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        self._addr = address
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        self._dbh = dbh
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        self._gid = get_gid(self._dbh, self._addr.domainname)
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        if not self._gid:
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            raise RErr(_("The domain '%s' does not exist.") %
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                       self._addr.domainname, NO_SUCH_DOMAIN)
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        self._dest = None
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        self._load()
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    def __bool__(self):
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        """Returns `True` if the Relocated is known, `False` if it's new."""
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        return self._dest is not None
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    def _load(self):
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        """Loads the destination address from the database into the
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        `_dest` attribute.
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        """
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT destination FROM relocated WHERE gid = %s AND '
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                    'address = %s', (self._gid, self._addr.localpart))
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        destination = dbc.fetchone()
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        dbc.close()
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        if destination:
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            destination = DestinationEmailAddress(destination[0], self._dbh)
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            if destination.at_localhost:
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                raise RErr(_("The destination address' domain name must not "
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                             "be localhost."), DOMAIN_INVALID)
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            self._dest = destination
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    @property
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    def address(self):
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        """The Relocated's EmailAddress instance."""
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        return self._addr
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    def set_destination(self, destination):
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        """Sets/updates the new address of the relocated user."""
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        update = False
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        assert isinstance(destination, DestinationEmailAddress)
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        if destination.at_localhost:
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            raise RErr(_("The destination address' domain name must not be "
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                         "localhost."), DOMAIN_INVALID)
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        if self._addr == destination:
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            raise RErr(_('Address and destination are identical.'),
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                       RELOCATED_ADDR_DEST_IDENTICAL)
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        if self._dest:
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            if self._dest == destination:
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                raise RErr(_("The relocated user '%s' already exists.") %
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                           self._addr, RELOCATED_EXISTS)
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            else:
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                self._dest = destination
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                update = True
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        else:
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            self._dest = destination
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        dbc = self._dbh.cursor()
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        if not update:
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            dbc.execute('INSERT INTO relocated (gid, address, destination) '
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                        'VALUES (%s, %s, %s)',
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                        (self._gid, self._addr.localpart, str(self._dest)))
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        else:
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            dbc.execute('UPDATE relocated SET destination = %s WHERE gid = %s '
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                        'AND address = %s',
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                        (str(self._dest), self._gid, self._addr.localpart))
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        self._dbh.commit()
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        dbc.close()
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    def get_info(self):
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        """Returns the address to which mails should be sent."""
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        if not self._dest:
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            raise RErr(_("The relocated user '%s' does not exist.") %
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                       self._addr, NO_SUCH_RELOCATED)
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        return self._dest
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    def delete(self):
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        """Deletes the relocated entry from the database."""
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        if not self._dest:
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            raise RErr(_("The relocated user '%s' does not exist.") %
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                       self._addr, NO_SUCH_RELOCATED)
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        dbc = self._dbh.cursor()
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        dbc.execute('DELETE FROM relocated WHERE gid = %s AND address = %s',
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                    (self._gid, self._addr.localpart))
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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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        self._dest = None
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del _