+
−# -*- coding: UTF-8 -*-
+
−# Copyright (c) 2007 - 2010, Pascal Volk
+
−# See COPYING for distribution information.
+
−# package initialization code
+
−#
+
−
+
−import gettext
+
−import os
+
−import re
+
−import locale
+
−
+
−from encodings.idna import ToASCII, ToUnicode
+
−
+
−from VirtualMailManager.constants.ERROR import \
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−     DOMAIN_INVALID, DOMAIN_TOO_LONG, NOT_EXECUTABLE, NO_SUCH_BINARY, \
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−     NO_SUCH_DIRECTORY
+
−from VirtualMailManager.constants.VERSION import *
+
−from VirtualMailManager.Exceptions import VMMException
+
−
+
−
+
−__all__ = [
+
−    # imported modules
+
−    'os', 're', 'locale',
+
−    # version information from VERSION
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−    '__author__', '__date__', '__version__',
+
−    # error codes
+
−    'ENCODING', 'ace2idna', 'chk_domainname', 'exec_ok', 'expand_path',
+
−    'get_unicode', 'idn2ascii', 'is_dir',
+
−]
+
−
+
−
+
−# Try to set all of the locales according to the current
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−# environment variables and get the character encoding.
+
−try:
+
−    locale.setlocale(locale.LC_ALL, '')
+
−except locale.Error:
+
−    locale.setlocale(locale.LC_ALL, 'C')
+
−ENCODING = locale.nl_langinfo(locale.CODESET)
+
−
+
−RE_ASCII_CHARS = """^[\x20-\x7E]*$"""
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−RE_DOMAIN = """^(?:[a-z0-9-]{1,63}\.){1,}[a-z]{2,6}$"""
+
−
+
−
+
−gettext.install('vmm', '/usr/local/share/locale', unicode=1)
+
−
+
−def get_unicode(string):
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−    """Converts `string` to `unicode`, if necessary."""
+
−    if isinstance(string, unicode):
+
−        return string
+
−    return unicode(string, ENCODING, 'replace')
+
−
+
−def expand_path(path):
+
−    """Expands paths, starting with ``.`` or ``~``, to an absolute path."""
+
−    if path.startswith('.'):
+
−        return os.path.abspath(path)
+
−    if path.startswith('~'):
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−        return os.path.expanduser(path)
+
−    return path
+
−
+
−def is_dir(path):
+
−    """Checks if ``path`` is a directory.
+
−
+
−    Throws a `VMMException` if ``path`` is not a directory.
+
−    """
+
−    path = expand_path(path)
+
−    if not os.path.isdir(path):
+
−        raise VMMException(_(u'“%s” is not a directory') % get_unicode(path),
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−                           NO_SUCH_DIRECTORY)
+
−    return path
+
−
+
−def exec_ok(binary):
+
−    """Checks if the ``binary`` exists and if it is executable.
+
−
+
−    Throws a `VMMException` if the ``binary`` isn't a file or is not
+
−    executable.
+
−    """
+
−    binary = expand_path(binary)
+
−    if not os.path.isfile(binary):
+
−        raise VMMException(_(u'“%s” is not a file') % get_unicode(binary),
+
−                           NO_SUCH_BINARY)
+
−    if not os.access(binary, os.X_OK):
+
−        raise VMMException(_(u'File is not executable: “%s”') %
+
−                           get_unicode(binary), NOT_EXECUTABLE)
+
−    return binary
+
−
+
−def idn2ascii(domainname):
+
−    """Converts the idn domain name `domainname` into punycode."""
+
−    return '.'.join([ToASCII(lbl) for lbl in domainname.split('.') if lbl])
+
−
+
−def ace2idna(domainname):
+
−    """Converts the domain name `domainname` from ACE according to IDNA."""
+
−    return u'.'.join([ToUnicode(lbl) for lbl in domainname.split('.') if lbl])
+
−
+
−def chk_domainname(domainname):
+
−    """Returns the validated domain name `domainname`.
+
−
+
−    It also converts the name of the domain from IDN to ASCII, if necessary.
+
−
+
−    Throws an VMMException, if the domain name is too long or doesn't look
+
−    like a valid domain name (label.label.label).
+
−    """
+
−    if not re.match(RE_ASCII_CHARS, domainname):
+
−        domainname = idn2ascii(domainname)
+
−    if len(domainname) > 255:
+
−        raise VMMException(_(u'The domain name is too long.'), DOMAIN_TOO_LONG)
+
−    if not re.match(RE_DOMAIN, domainname):
+
−        raise VMMException(_(u'The domain name “%s” is invalid.') % domainname,
+
−                           DOMAIN_INVALID)
+
−    return domainname