VirtualMailManager/emailaddress.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 28 Jul 2010 03:43:59 +0000
branchv0.6.x
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child 341 6709d0faf2f5
permissions -rw-r--r--
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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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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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
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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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from VirtualMailManager.errors import 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):
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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 __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 %r") % 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 %r") % 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 %r') % 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 %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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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 _