VirtualMailManager/maillocation.py
author Pascal Volk <user@localhost.localdomain.org>
Sun, 13 Jan 2013 18:12:51 +0000
branchv0.7.x
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2013, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.maillocation
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's maillocation module to handle Dovecot's
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    mail_location setting for accounts.
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"""
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from VirtualMailManager.constants import MAILLOCATION_INIT
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from VirtualMailManager.errors import MailLocationError as MLErr
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__all__ = ('MailLocation', 'known_format')
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_ = lambda msg: msg
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_format_info = {
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    'maildir': dict(dovecot_version=0x10000f00, postfix=True),
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    'mdbox': dict(dovecot_version=0x20000b05, postfix=False),
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    'sdbox': dict(dovecot_version=0x20000c03, postfix=False),
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}
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class MailLocation(object):
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    """Class to handle mail_location relevant information."""
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    __slots__ = ('_directory', '_mbfmt', '_mid', '_dbh')
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    _kwargs = ('mid', 'mbfmt', 'directory')
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    def __init__(self, dbh, **kwargs):
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        """Creates a new MailLocation instance.
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        Either the mid keyword or the mbfmt and directory keywords must be
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        specified.
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        Arguments:
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        `dbh` : pyPgSQL.PgSQL.Connection
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          A database connection for the database access.
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        Keyword arguments:
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        `mid` : int
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          the id of a mail_location
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        `mbfmt` : str
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          the mailbox format of the mail_location. One out of: ``maildir``,
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          ``sdbox`` and ``mdbox``.
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        `directory` : str
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          name of the mailbox root directory.
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        """
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        self._dbh = dbh
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        self._directory = None
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        self._mbfmt = None
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        self._mid = 0
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        for key in kwargs.keys():
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            if key not in self.__class__._kwargs:
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                raise ValueError('unrecognized keyword: %r' % key)
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        mid = kwargs.get('mid')
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        if mid:
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            assert isinstance(mid, int)
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            self._load_by_mid(mid)
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        else:
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            args = kwargs.get('mbfmt'), kwargs.get('directory')
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            assert all(isinstance(arg, str) for arg in args)
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            if args[0].lower() not in _format_info:
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                raise MLErr(_("Unsupported mailbox format: '%s'") % args[0],
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                            MAILLOCATION_INIT)
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            directory = args[1].strip()
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            if not directory:
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                raise MLErr(_("Empty directory name"), MAILLOCATION_INIT)
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            if len(directory) > 20:
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                raise MLErr(_("Directory name is too long: '%s'") % directory,
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                            MAILLOCATION_INIT)
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            self._load_by_names(args[0].lower(), directory)
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    def __str__(self):
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        return '%s:~/%s' % (self._mbfmt, self._directory)
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    @property
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    def directory(self):
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        """The mail_location's directory name."""
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        return self._directory
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    @property
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    def dovecot_version(self):
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        """The required Dovecot version for this mailbox format."""
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        return _format_info[self._mbfmt]['dovecot_version']
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    @property
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    def postfix(self):
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        """`True` if Postfix supports this mailbox format, else `False`."""
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        return _format_info[self._mbfmt]['postfix']
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    @property
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    def mbformat(self):
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        """The mail_location's mailbox format."""
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        return self._mbfmt
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    @property
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    def mail_location(self):
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        """The mail_location, e.g. ``maildir:~/Maildir``"""
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        return self.__str__()
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    @property
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    def mid(self):
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        """The mail_location's unique ID."""
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        return self._mid
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    def _load_by_mid(self, mid):
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        """Load mail_location relevant information by *mid*"""
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT format, directory FROM mailboxformat, '
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                    'maillocation WHERE mid = %u AND '
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                    'maillocation.fid = mailboxformat.fid' % mid)
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        result = dbc.fetchone()
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        dbc.close()
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        if not result:
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            raise ValueError('Unknown mail_location id specified: %r' % mid)
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        self._mid = mid
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        self._mbfmt, self._directory = result
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    def _load_by_names(self, mbfmt, directory):
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        """Try to load mail_location relevant information by *mbfmt* and
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        *directory* name. If it fails goto _save()."""
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        dbc = self._dbh.cursor()
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        dbc.execute("SELECT mid FROM maillocation WHERE fid = (SELECT fid "
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                    "FROM mailboxformat WHERE format = %s) AND directory = %s",
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                    (mbfmt, directory))
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        result = dbc.fetchone()
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        dbc.close()
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        if not result:
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            self._save(mbfmt, directory)
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        else:
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            self._mid = result[0]
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            self._mbfmt = mbfmt
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            self._directory = directory
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    def _save(self, mbfmt, directory):
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        """Save a new mail_location in the database."""
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        dbc = self._dbh.cursor()
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        dbc.execute("SELECT nextval('maillocation_id')")
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        mid = dbc.fetchone()[0]
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        dbc.execute("INSERT INTO maillocation (fid, mid, directory) VALUES ("
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                    "(SELECT fid FROM mailboxformat WHERE format = %s), %s, "
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                    "%s)",  (mbfmt, mid, directory))
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        self._dbh.commit()
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        dbc.close()
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        self._mid = mid
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        self._mbfmt = mbfmt
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        self._directory = directory
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def known_format(mbfmt):
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    """Checks if the mailbox format *mbfmt* is known, returns bool."""
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    return mbfmt.lower() in _format_info
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del _