VirtualMailManager/emailaddress.py
author Pascal Volk <neverseen@users.sourceforge.net>
Sat, 12 Feb 2011 17:19:43 +0000
branchv0.6.x
changeset 399 fb22773f7a85
parent 367 a6ad9895989d
child 417 8209da83e256
permissions -rw-r--r--
VMM/common: Reworked human_size() once more. Return bytes w/o prefix. Use translatable $FOO_bibyte prefixes, e.g., MiB.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2011, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.emailaddress
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's EmailAddress class to handle e-mail addresses.
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"""
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import re
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from VirtualMailManager.domain import check_domainname, get_gid
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from VirtualMailManager.constants import \
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     DOMAIN_NO_NAME, INVALID_ADDRESS, LOCALPART_INVALID, LOCALPART_TOO_LONG
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from VirtualMailManager.errors import EmailAddressError as EAErr
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RE_LOCALPART = re.compile(r"[^\w!#$%&'\*\+-\.\/=?^_`{\|}~]")
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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 '%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')
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    def __init__(self, address, dbh):
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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)
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        self._gid = 0
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        self._find_domain(dbh)
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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 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 _