VirtualMailManager/__init__.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 24 Feb 2010 05:04:30 +0000
branchv0.6.x
changeset 213 1a9fee6b93bc
parent 209 c705a9e38962
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) 2007 - 2010, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager
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    VirtualMailManager package initialization code
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"""
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import gettext
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import os
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import re
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import locale
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from encodings.idna import ToASCII, ToUnicode
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from VirtualMailManager.constants.ERROR import \
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     DOMAIN_INVALID, DOMAIN_TOO_LONG, LOCALPART_INVALID, LOCALPART_TOO_LONG, \
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     NOT_EXECUTABLE, NO_SUCH_BINARY, NO_SUCH_DIRECTORY
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from VirtualMailManager.constants.VERSION import *
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from VirtualMailManager.Exceptions import VMMException
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__all__ = [
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    # imported modules
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    'os', 're', 'locale',
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    # version information from VERSION
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    '__author__', '__date__', '__version__',
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    # defined stuff
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    'ENCODING', 'ace2idna', 'check_domainname', 'check_localpart', 'exec_ok',
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    'expand_path', 'get_unicode', 'idn2ascii', 'is_dir',
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]
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# Try to set all of the locales according to the current
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# environment variables and get the character encoding.
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try:
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    locale.setlocale(locale.LC_ALL, '')
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except locale.Error:
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    locale.setlocale(locale.LC_ALL, 'C')
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ENCODING = locale.nl_langinfo(locale.CODESET)
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RE_DOMAIN = r"^(?:[a-z0-9-]{1,63}\.){1,}[a-z]{2,6}$"
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RE_LOCALPART = r"[^\w!#$%&'\*\+-\.\/=?^_`{\|}~]"
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# there may be many domain and e-mail address checks
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re_obj_domain = re.compile(RE_DOMAIN)
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re_obj_localpart = re.compile(RE_LOCALPART)
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gettext.install('vmm', '/usr/local/share/locale', unicode=1)
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def get_unicode(string):
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    """Converts `string` to `unicode`, if necessary."""
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    if isinstance(string, unicode):
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        return string
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    return unicode(string, ENCODING, 'replace')
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def expand_path(path):
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    """Expands paths, starting with ``.`` or ``~``, to an absolute path."""
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    if path.startswith('.'):
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        return os.path.abspath(path)
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    if path.startswith('~'):
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        return os.path.expanduser(path)
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    return path
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def is_dir(path):
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    """Checks if `path` is a directory.
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    Throws a `VMMException` if `path` is not a directory.
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    """
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    path = expand_path(path)
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    if not os.path.isdir(path):
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        raise VMMException(_(u"'%s' is not a directory") %
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                            get_unicode(path), NO_SUCH_DIRECTORY)
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    return path
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def exec_ok(binary):
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    """Checks if the `binary` exists and if it is executable.
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    Throws a `VMMException` if the `binary` isn't a file or is not
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    executable.
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    """
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    binary = expand_path(binary)
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    if not os.path.isfile(binary):
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        raise VMMException(_(u"'%s' is not a file") % get_unicode(binary),
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                           NO_SUCH_BINARY)
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    if not os.access(binary, os.X_OK):
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        raise VMMException(_(u"File is not executable: '%s'") %
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                           get_unicode(binary), NOT_EXECUTABLE)
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    return binary
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def idn2ascii(domainname):
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    """Converts the idn domain name `domainname` into punycode."""
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    return '.'.join([ToASCII(lbl) for lbl in domainname.split('.') if lbl])
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def ace2idna(domainname):
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    """Converts the domain name `domainname` from ACE according to IDNA."""
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    return u'.'.join([ToUnicode(lbl) for lbl in domainname.split('.') if lbl])
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def check_domainname(domainname):
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    """Returns the validated domain name `domainname`.
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    It also converts the name of the domain from IDN to ASCII, if necessary.
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    Throws an `VMMException`, if the domain name is too long or doesn't look
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    like a valid domain name (label.label.label).
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    """
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    if not re_obj_domain.match(domainname):
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        domainname = idn2ascii(domainname)
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    if len(domainname) > 255:
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        raise VMMException(_(u'The domain name is too long'), DOMAIN_TOO_LONG)
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    if not re_obj_domain.match(domainname):
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        raise VMMException(_(u'The domain name %r is invalid') % domainname,
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                           DOMAIN_INVALID)
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    return domainname
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def check_localpart(localpart):
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    """Returns the validated local-part `localpart`.
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    Throws a `VMMException` 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 VMMException(_(u'The local-part %r is too long') % localpart,
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                           LOCALPART_TOO_LONG)
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    invalid_chars = set(re_obj_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 VMMException(_(u"The local-part %(l_part)r contains invalid \
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characters: %(i_chars)s") %
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                           {'l_part': localpart, 'i_chars': i_chars},
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                           LOCALPART_INVALID)
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    return localpart