VirtualMailManager/EmailAddress.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 24 Feb 2010 05:04:30 +0000
branchv0.6.x
changeset 213 1a9fee6b93bc
parent 208 efa1327b721f
child 215 33f727efa7c4
permissions -rw-r--r--
VMM:/{Alias,EmailAddress,Relocated}: use assertions for argument checks.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2010, 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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    Virtual Mail Manager's EmailAddress class to handle e-mail addresses.
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"""
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from VirtualMailManager import check_domainname, check_localpart
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from VirtualMailManager.constants.ERROR import \
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     DOMAIN_NO_NAME, INVALID_ADDRESS, LOCALPART_INVALID
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from VirtualMailManager.Exceptions import VMMEmailAddressException as VMMEAE
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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):
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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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        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 __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 VMMEAE(_(u"Missing the '@' sign in address %r") % address,
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                         INVALID_ADDRESS)
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        elif p_len > 2:
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            raise VMMEAE(_(u"Too many '@' signs in address %r") % address,
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                         INVALID_ADDRESS)
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        if not parts[0]:
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            raise VMMEAE(_(u"Missing local-part in address %r") % address,
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                         LOCALPART_INVALID)
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        if not parts[1]:
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            raise VMMEAE(_(u"Missing domain name in address %r") % 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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del _