VirtualMailManager/emailaddress.py
author martin f. krafft <madduck@madduck.net>
Mon, 09 Apr 2012 18:10:56 +0200
branchv0.6.x
changeset 504 f180ead60568
parent 427 8e41e77b84e6
child 568 14abdd04ddf5
permissions -rw-r--r--
First version of a CatchallAlias class I based the CatchallAlias class in catchall.py heavily on the Alias class, but by copy, not deriving. The two are functionally related, but the implementations are too different because CatchallAliases have no localpart.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2011, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.emailaddress
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's EmailAddress class to handle e-mail addresses.
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"""
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import re
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from VirtualMailManager.domain import check_domainname, get_gid
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from VirtualMailManager.constants import \
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     DOMAIN_NO_NAME, INVALID_ADDRESS, LOCALPART_INVALID, LOCALPART_TOO_LONG, \
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     DOMAIN_INVALID
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from VirtualMailManager.errors import DomainError, EmailAddressError as EAErr
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RE_LOCALPART = re.compile(r"[^\w!#$%&'\*\+-\.\/=?^_`{\|}~]")
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_ = lambda msg: msg
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class EmailAddress(object):
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    """Simple class for validated e-mail addresses."""
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    __slots__ = ('_localpart', '_domainname')
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    def __init__(self, address, _validate=True):
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        """Creates a new instance from the string/unicode ``address``."""
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        assert isinstance(address, basestring)
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        self._localpart = None
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        self._domainname = None
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        if _validate:
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            self._chk_address(address)
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    @property
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    def localpart(self):
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        """The local-part of the address *local-part@domain*"""
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        return self._localpart
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    @property
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    def domainname(self):
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        """The domain part of the address *local-part@domain*"""
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        return self._domainname
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    def __eq__(self, other):
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        if isinstance(other, self.__class__):
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            return self._localpart == other._localpart and \
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                    self._domainname == other._domainname
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        return NotImplemented
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    def __ne__(self, other):
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        if isinstance(other, self.__class__):
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            return self._localpart != other._localpart or \
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                    self._domainname != other._domainname
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        return NotImplemented
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    def __hash__(self):
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        return hash((self._localpart.lower(), self._domainname.lower()))
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    def __repr__(self):
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        return "EmailAddress('%s@%s')" % (self._localpart, self._domainname)
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    def __str__(self):
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        return '%s@%s' % (self._localpart, self._domainname)
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    def _chk_address(self, address):
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        """Checks if the string ``address`` could be used for an e-mail
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        address.  If so, it will assign the corresponding values to the
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        attributes `_localpart` and `_domainname`."""
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        parts = address.split('@')
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        p_len = len(parts)
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        if p_len < 2:
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            raise EAErr(_(u"Missing the '@' sign in address: '%s'") % address,
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                        INVALID_ADDRESS)
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        elif p_len > 2:
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            raise EAErr(_(u"Too many '@' signs in address: '%s'") % address,
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                        INVALID_ADDRESS)
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        if not parts[0]:
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            raise EAErr(_(u"Missing local-part in address: '%s'") % address,
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                        LOCALPART_INVALID)
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        if not parts[1]:
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            raise EAErr(_(u"Missing domain name in address: '%s'") % address,
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                        DOMAIN_NO_NAME)
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        self._localpart = check_localpart(parts[0])
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        self._domainname = check_domainname(parts[1])
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class DestinationEmailAddress(EmailAddress):
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    """Provides additionally the domains group ID - when the domain is known
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    in the database."""
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    __slots__ = ('_gid', '_localhost')
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    def __init__(self, address, dbh, _validate=False):
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        """Creates a new DestinationEmailAddress instance
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        Arguments:
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        `address`: string/unicode
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          a e-mail address like user@example.com
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        `dbh`: pyPgSQL.PgSQL.Connection/pyPgSQL.PgSQL.connection
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          a database connection for the database access
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        """
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        super(DestinationEmailAddress, self).__init__(address, _validate)
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        self._localhost = False
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        if not _validate:
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            try:
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                self._chk_address(address)
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            except DomainError, err:
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                if err.code is DOMAIN_INVALID and \
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                   address.split('@')[1] == 'localhost':
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                    self._localhost = True
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                    self._domainname = 'localhost'
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                else:
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                    raise
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        self._gid = 0
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        if not self._localhost:
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            self._find_domain(dbh)
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        else:
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            self._localpart = self._localpart.lower()
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    def _find_domain(self, dbh):
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        """Checks if the domain is known"""
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        self._gid = get_gid(dbh, self._domainname)
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        if self._gid:
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            self._localpart = self._localpart.lower()
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    @property
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    def at_localhost(self):
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        """True when the address is something@localhost."""
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        return self._localhost
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    @property
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    def gid(self):
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        """The domains group ID. 0 if the domain is not known."""
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        return self._gid
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def check_localpart(localpart):
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    """Returns the validated local-part `localpart`.
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    Throws a `EmailAddressError` if the local-part is too long or contains
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    invalid characters.
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    """
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    if len(localpart) > 64:
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        raise EAErr(_(u"The local-part '%s' is too long.") % localpart,
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                    LOCALPART_TOO_LONG)
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    invalid_chars = set(RE_LOCALPART.findall(localpart))
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    if invalid_chars:
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        i_chars = u''.join((u'"%s" ' % c for c in invalid_chars))
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        raise EAErr(_(u"The local-part '%(l_part)s' contains invalid "
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                      u"characters: %(i_chars)s") % {'l_part': localpart,
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                    'i_chars': i_chars}, LOCALPART_INVALID)
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    return localpart
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del _