VirtualMailManager/Config.py
author Pascal Volk <neverseen@users.sourceforge.net>
Mon, 12 Jul 2010 01:53:32 +0000
branchv0.6.x
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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.Config
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    VMM's configuration module for simplified configuration access.
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"""
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import re
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from ConfigParser import \
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     Error, MissingSectionHeaderError, NoOptionError, NoSectionError, \
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     ParsingError, RawConfigParser
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from cStringIO import StringIO# TODO: move interactive stff to cli
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from VirtualMailManager.common import exec_ok, get_unicode, is_dir, version_hex
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from VirtualMailManager.constants.ERROR import CONF_ERROR
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from VirtualMailManager.errors import ConfigError, VMMError
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from VirtualMailManager.password import verify_scheme as _verify_scheme
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_ = lambda msg: msg
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class BadOptionError(Error):
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    """Raised when a option isn't in the format 'section.option'."""
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    pass
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class ConfigValueError(Error):
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    """Raised when creating or validating of new values fails."""
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    pass
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class NoDefaultError(Error):
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    """Raised when the requested option has no default value."""
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    def __init__(self, section, option):
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        Error.__init__(self, 'Option %r in section %r has no default value' %
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                             (option, section))
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class LazyConfig(RawConfigParser):
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    """The **lazy** derivate of the `RawConfigParser`.
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    There are two additional getters:
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    `pget()`
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      The polymorphic getter, which returns a option's value with the
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      appropriate type.
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    `dget()`
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      Like `LazyConfig.pget()`, but returns the option's default, from
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      `LazyConfig._cfg['sectionname']['optionname'].default`, if the
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      option is not configured in a ini-like configuration file.
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    `set()` differs from `RawConfigParser`'s `set()` method. `set()`
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    takes the `section` and `option` arguments combined to a single
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    string in the form "section.option".
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    """
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    def __init__(self):
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        RawConfigParser.__init__(self)
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        self._modified = False
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        # sample _cfg dict.  Create your own in your derived class.
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        self._cfg = {
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            'sectionname': {
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                'optionname': LazyConfigOption(int, 1, self.getint),
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            }
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        }
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    def bool_new(self, value):
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        """Converts the string `value` into a `bool` and returns it.
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        | '1', 'on', 'yes' and 'true' will become `True`
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        | '0', 'off', 'no' and 'false' will become `False`
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        Throws a `ConfigValueError` for all other values, except bools.
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        """
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        if isinstance(value, bool):
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            return value
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        if value.lower() in self._boolean_states:
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            return self._boolean_states[value.lower()]
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        else:
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            raise ConfigValueError(_(u"Not a boolean: '%s'") %
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                                   get_unicode(value))
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    def getboolean(self, section, option):
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        """Returns the boolean value of the option, in the given
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        section.
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        For a boolean True, the value must be set to '1', 'on', 'yes',
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        'true' or True. For a boolean False, the value must set to '0',
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        'off', 'no', 'false' or False.
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        If the option has another value assigned this method will raise
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        a ValueError.
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        """
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        # if the setting was modified it may be still a boolean value lets see
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        tmp = self.get(section, option)
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        if isinstance(tmp, bool):
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            return tmp
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        if not tmp.lower() in self._boolean_states:
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            raise ValueError('Not a boolean: %s' % tmp)
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        return self._boolean_states[tmp.lower()]
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    def _get_section_option(self, section_option):
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        """splits ``section_option`` (section.option) in two parts and
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        returns them as list ``[section, option]``, if:
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          * it likes the format of ``section_option``
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          * the ``section`` is known
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          * the ``option`` is known
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        Else one of the following exceptions will be thrown:
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          * `BadOptionError`
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          * `NoSectionError`
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          * `NoOptionError`
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        """
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        sect_opt = section_option.lower().split('.')
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        # TODO: cache it
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        if len(sect_opt) != 2:  # do we need a regexp to check the format?
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            raise BadOptionError(_(u"Bad format: '%s' - expected: "
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                                   u"section.option") %
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                                 get_unicode(section_option))
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        if not sect_opt[0] in self._cfg:
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            raise NoSectionError(sect_opt[0])
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        if not sect_opt[1] in self._cfg[sect_opt[0]]:
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            raise NoOptionError(sect_opt[1], sect_opt[0])
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        return sect_opt
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    def items(self, section):
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        """returns an iterable that returns key, value ``tuples`` from
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        the given ``section``.
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        """
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        if section in self._sections:  # check if the section was parsed
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            sect = self._sections[section]
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        elif not section in self._cfg:
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            raise NoSectionError(section)
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        else:
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            return ((k, self._cfg[section][k].default) \
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                    for k in self._cfg[section].iterkeys())
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        # still here? Get defaults and merge defaults with configured setting
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        defaults = dict((k, self._cfg[section][k].default) \
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                        for k in self._cfg[section].iterkeys())
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        defaults.update(sect)
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        if '__name__' in defaults:
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            del defaults['__name__']
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        return defaults.iteritems()
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    def dget(self, option):
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        """Returns the value of the `option`.
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        If the option could not be found in the configuration file, the
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        configured default value, from ``LazyConfig._cfg`` will be
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        returned.
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        Arguments:
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        `option` : string
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            the configuration option in the form "section.option"
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        Throws a `NoDefaultError`, if no default value was passed to
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        `LazyConfigOption.__init__()` for the `option`.
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        """
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        section, option = self._get_section_option(option)
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        try:
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            return self._cfg[section][option].getter(section, option)
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        except (NoSectionError, NoOptionError):
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            if not self._cfg[section][option].default is None:  # may be False
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                return self._cfg[section][option].default
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            else:
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                raise NoDefaultError(section, option)
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    def pget(self, option):
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        """Returns the value of the `option`."""
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        section, option = self._get_section_option(option)
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        return self._cfg[section][option].getter(section, option)
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    def set(self, option, value):
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        """Set the `value` of the `option`.
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        Throws a `ValueError` if `value` couldn't be converted using
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        `LazyConfigOption.cls`.
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        """
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        # pylint: disable-msg=W0221
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        # @pylint: _L A Z Y_
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        section, option = self._get_section_option(option)
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        val = self._cfg[section][option].cls(value)
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        if self._cfg[section][option].validate:
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            val = self._cfg[section][option].validate(val)
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        if not RawConfigParser.has_section(self, section):
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            self.add_section(section)
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        RawConfigParser.set(self, section, option, val)
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        self._modified = True
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    def has_section(self, section):
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        """Checks if `section` is a known configuration section."""
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        return section.lower() in self._cfg
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    def has_option(self, option):
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        """Checks if the option (section.option) is a known
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        configuration option.
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        """
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        # pylint: disable-msg=W0221
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        # @pylint: _L A Z Y_
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        try:
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            self._get_section_option(option)
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            return True
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        except(BadOptionError, NoSectionError, NoOptionError):
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            return False
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    def sections(self):
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        """Returns an iterator object for all configuration sections."""
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        return self._cfg.iterkeys()
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   224
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class LazyConfigOption(object):
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    """A simple container class for configuration settings.
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    `LazyConfigOption` instances are required by `LazyConfig` instances,
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    and instances of classes derived from `LazyConfig`, like the
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    `Config` class.
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    """
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    __slots__ = ('__cls', '__default', '__getter', '__validate')
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    def __init__(self, cls, default, getter, validate=None):
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        """Creates a new `LazyConfigOption` instance.
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        Arguments:
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        `cls` : type
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          The class/type of the option's value
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        `default`
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          Default value of the option. Use ``None`` if the option should
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          not have a default value.
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        `getter` : callable
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          A method's name of `RawConfigParser` and derived classes, to
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          get a option's value, e.g. `self.getint`.
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        `validate` : NoneType or a callable
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          None or any method, that takes one argument, in order to
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          check the value, when `LazyConfig.set()` is called.
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        """
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        self.__cls = cls
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        if not default is None:  # enforce the type of the default value
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            self.__default = self.__cls(default)
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        else:
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            self.__default = default
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        if not callable(getter):
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            raise TypeError('getter has to be a callable, got a %r' %
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                            getter.__class__.__name__)
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        self.__getter = getter
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        if validate and not callable(validate):
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            raise TypeError('validate has to be callable or None, got a %r' %
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                            validate.__class__.__name__)
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        self.__validate = validate
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    @property
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    def cls(self):
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        """The class of the option's value e.g. `str`, `unicode` or
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        `bool`.
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        """
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        return self.__cls
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    @property
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    def default(self):
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        """The option's default value, may be `None`"""
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        return self.__default
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    @property
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    def getter(self):
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        """The getter method or function to get the option's value"""
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        return self.__getter
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    @property
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    def validate(self):
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        """A method or function to validate the value"""
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        return self.__validate
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class Config(LazyConfig):
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    """This class is for reading vmm's configuration file."""
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    def __init__(self, filename):
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        """Creates a new Config instance
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        Arguments:
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   299
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        `filename` : str
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          path to the configuration file
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0
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        """
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        LazyConfig.__init__(self)
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        self._cfg_filename = filename
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        self._cfg_file = None
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        self.__missing = {}
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   308
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   309
        LCO = LazyConfigOption
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        bool_t = self.bool_new
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        self._cfg = {
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            'account': {
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   313
                'delete_directory': LCO(bool_t, False, self.getboolean),
215
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   314
                'directory_mode': LCO(int, 448, self.getint),
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   315
                'disk_usage': LCO(bool_t, False, self.getboolean),
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   316
                'password_length': LCO(int, 8, self.getint),
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                'random_password': LCO(bool_t, False, self.getboolean),
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                'imap': LCO(bool_t, True, self.getboolean),
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                'pop3': LCO(bool_t, True, self.getboolean),
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                'sieve': LCO(bool_t, True, self.getboolean),
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   321
                'smtp': LCO(bool_t, True, self.getboolean),
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   322
            },
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   323
            'bin': {
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   324
                'dovecotpw': LCO(str, '/usr/sbin/dovecotpw', self.get,
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   325
                                 exec_ok),
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   326
                'du': LCO(str, '/usr/bin/du', self.get, exec_ok),
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                'postconf': LCO(str, '/usr/sbin/postconf', self.get, exec_ok),
174
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   328
            },
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   329
            'database': {
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   330
                'host': LCO(str, 'localhost', self.get),
215
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   331
                'name': LCO(str, 'mailsys', self.get),
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   332
                'pass': LCO(str, None, self.get),
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   333
                'user': LCO(str, None, self.get),
174
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diff changeset
   334
            },
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diff changeset
   335
            'domain': {
215
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   336
                'auto_postmaster': LCO(bool_t, True, self.getboolean),
206
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   337
                'delete_directory': LCO(bool_t, False, self.getboolean),
215
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   338
                'directory_mode': LCO(int, 504, self.getint),
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   339
                'force_deletion': LCO(bool_t, False, self.getboolean),
174
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diff changeset
   340
            },
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diff changeset
   341
            'mailbox': {
174
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   342
                'folders': LCO(str, 'Drafts:Sent:Templates:Trash', self.get),
229
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   343
                'format': LCO(str, 'maildir', self.get),
174
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diff changeset
   344
            },
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diff changeset
   345
            'misc': {
215
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   346
                'base_directory': LCO(str, '/srv/mail', self.get, is_dir),
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   347
                'crypt_blowfish_rounds': LCO(int, 5, self.getint),
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   348
                'crypt_sha256_rounds': LCO(int, 5000, self.getint),
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   349
                'crypt_sha512_rounds': LCO(int, 5000, self.getint),
286
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   350
                'dovecot_version': LCO(str, None, self.hexversion,
264
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   351
                                       check_version_format),
215
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   352
                'password_scheme': LCO(str, 'CRAM-MD5', self.get,
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diff changeset
   353
                                       verify_scheme),
215
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   354
                'transport': LCO(str, 'dovecot:', self.get),
174
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diff changeset
   355
            },
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diff changeset
   356
        }
0
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   357
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   358
    def load(self):
120
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   359
        """Loads the configuration, read only.
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diff changeset
   360
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diff changeset
   361
        Raises a ConfigError if the configuration syntax is
215
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diff changeset
   362
        invalid.
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   363
120
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diff changeset
   364
        """
0
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   365
        try:
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diff changeset
   366
            self._cfg_file = open(self._cfg_filename, 'r')
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   367
            self.readfp(self._cfg_file)
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   368
        except (MissingSectionHeaderError, ParsingError), err:
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0c8c053b451c Moved VirtualMailManager/Exceptions to VirtualMailManager/errors.
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diff changeset
   369
            raise ConfigError(str(err), CONF_ERROR)
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diff changeset
   370
        finally:
215
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diff changeset
   371
            if self._cfg_file and not self._cfg_file.closed:
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   372
                self._cfg_file.close()
0
bb0aa2102206 Initial import @sf.net
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   373
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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   374
    def check(self):
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   375
        """Performs a configuration check.
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cf8116625866 Converted VirtualMailManager and Postconf to new-style classes.
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   376
264
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   377
        Raises a ConfigError if settings w/o a default value are missed.
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   378
        Or a ConfigValueError if 'misc.dovecot_version' has the wrong
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   379
        format.
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   380
        """
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   381
        # TODO: There are only two settings w/o defaults.
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   382
        #       So there is no need for cStringIO
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   383
        if not self.__chk_cfg():
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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   384
            errmsg = StringIO()
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   385
            errmsg.write(_(u'Missing options, which have no default value.\n'))
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   386
            errmsg.write(_(u'Using configuration file: %s\n') %
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diff changeset
   387
                         self._cfg_filename)
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   388
            for section, options in self.__missing.iteritems():
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   389
                errmsg.write(_(u'* Section: %s\n') % section)
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   390
                for option in options:
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   391
                    errmsg.write((u'    %s\n') % option)
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   392
            raise ConfigError(errmsg.getvalue(), CONF_ERROR)
264
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   393
        check_version_format(self.get('misc', 'dovecot_version'))
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diff changeset
   394
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   395
    def hexversion(self, section, option):
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446483386914 VMM/Config: Added method Config.install() -> global cfg_dget().
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   396
        """Converts the version number (e.g.: 1.2.3) from the *option*'s
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   397
        value to an int."""
264
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   398
        return version_hex(self.get(section, option))
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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parents: 0
diff changeset
   399
174
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diff changeset
   400
    def unicode(self, section, option):
215
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   401
        """Returns the value of the `option` from `section`, converted
287
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diff changeset
   402
        to Unicode."""
174
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   403
        return get_unicode(self.get(section, option))
69
0c124160a991 * 'VirtualMailManager/VirtualMailManager.py'
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diff changeset
   404
215
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diff changeset
   405
    def __chk_cfg(self):
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   406
        """Checks all section's options for settings w/o a default
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   407
        value.
185
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diff changeset
   408
215
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diff changeset
   409
        Returns `True` if everything is fine, else `False`.
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diff changeset
   410
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diff changeset
   411
        """
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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diff changeset
   412
        errors = False
174
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diff changeset
   413
        for section in self._cfg.iterkeys():
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diff changeset
   414
            missing = []
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diff changeset
   415
            for option, value in self._cfg[section].iteritems():
187
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diff changeset
   416
                if (value.default is None and
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diff changeset
   417
                    not RawConfigParser.has_option(self, section, option)):
215
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diff changeset
   418
                    missing.append(option)
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diff changeset
   419
                    errors = True
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983cf98d5881 VMM/Config: attributes of class LazyConfigOption are read-only now.
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diff changeset
   420
            if missing:
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   421
                self.__missing[section] = missing
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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diff changeset
   422
        return not errors
215
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diff changeset
   423
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diff changeset
   424
264
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   425
def check_version_format(version_string):
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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   426
    """Check if the *version_string* has the proper format, e.g.: '1.2.3'.
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   427
    Returns the validated version string if it has the expected format.
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diff changeset
   428
    Otherwise a `ConfigValueError` will be raised.
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diff changeset
   429
    """
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   430
    version_re = r'^\d+\.\d+\.(?:\d+|(?:alpha|beta|rc)\d+)$'
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   431
    if not re.match(version_re, version_string):
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   432
        raise ConfigValueError(_(u"Not a valid Dovecot version: '%s'") %
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   433
                               get_unicode(version_string))
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   434
    return version_string
04fea4d8b900 Use the complete Dovecot version, not only the concatenated major
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diff changeset
   435
287
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   436
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   437
def verify_scheme(scheme):
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   438
    """Checks if the password scheme *scheme* can be accepted and returns
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   439
    the verified scheme.
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   440
    """
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   441
    try:
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   442
        scheme, encoding = _verify_scheme(scheme)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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parents: 286
diff changeset
   443
    except VMMError, err:  # 'cast' it
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   444
        raise ConfigValueError(err.msg)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   445
    if not encoding:
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   446
        return scheme
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   447
    return '%s.%s' % (scheme, encoding)
1e77dd639fa3 VMM/password: moved the 'scheme check' code from pwhash() to the
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diff changeset
   448
215
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diff changeset
   449
del _