diff -r f4956b4ceba1 -r 011066435e6f VirtualMailManager/Config.py --- a/VirtualMailManager/Config.py Wed Jul 28 01:03:56 2010 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,452 +0,0 @@ -# -*- coding: UTF-8 -*- -# Copyright (c) 2007 - 2010, Pascal Volk -# See COPYING for distribution information. - -""" - VirtualMailManager.Config - ~~~~~~~~~~~~~~~~~~~~~~~~~ - - VMM's configuration module for simplified configuration access. -""" - -import re - -from ConfigParser import \ - Error, MissingSectionHeaderError, NoOptionError, NoSectionError, \ - ParsingError, RawConfigParser -from cStringIO import StringIO# TODO: move interactive stff to cli - -from VirtualMailManager.common import exec_ok, get_unicode, is_dir, version_hex -from VirtualMailManager.constants import CONF_ERROR -from VirtualMailManager.errors import ConfigError, VMMError -from VirtualMailManager.maillocation import known_format -from VirtualMailManager.password import verify_scheme as _verify_scheme - - -_ = lambda msg: msg - - -class BadOptionError(Error): - """Raised when a option isn't in the format 'section.option'.""" - pass - - -class ConfigValueError(Error): - """Raised when creating or validating of new values fails.""" - pass - - -class NoDefaultError(Error): - """Raised when the requested option has no default value.""" - - def __init__(self, section, option): - Error.__init__(self, 'Option %r in section %r has no default value' % - (option, section)) - - -class LazyConfig(RawConfigParser): - """The **lazy** derivate of the `RawConfigParser`. - - There are two additional getters: - - `pget()` - The polymorphic getter, which returns a option's value with the - appropriate type. - `dget()` - Like `LazyConfig.pget()`, but returns the option's default, from - `LazyConfig._cfg['sectionname']['optionname'].default`, if the - option is not configured in a ini-like configuration file. - - `set()` differs from `RawConfigParser`'s `set()` method. `set()` - takes the `section` and `option` arguments combined to a single - string in the form "section.option". - """ - - def __init__(self): - RawConfigParser.__init__(self) - self._modified = False - # sample _cfg dict. Create your own in your derived class. - self._cfg = { - 'sectionname': { - 'optionname': LazyConfigOption(int, 1, self.getint), - } - } - - def bool_new(self, value): - """Converts the string `value` into a `bool` and returns it. - - | '1', 'on', 'yes' and 'true' will become `True` - | '0', 'off', 'no' and 'false' will become `False` - - Throws a `ConfigValueError` for all other values, except bools. - """ - if isinstance(value, bool): - return value - if value.lower() in self._boolean_states: - return self._boolean_states[value.lower()] - else: - raise ConfigValueError(_(u"Not a boolean: '%s'") % - get_unicode(value)) - - def getboolean(self, section, option): - """Returns the boolean value of the option, in the given - section. - - For a boolean True, the value must be set to '1', 'on', 'yes', - 'true' or True. For a boolean False, the value must set to '0', - 'off', 'no', 'false' or False. - If the option has another value assigned this method will raise - a ValueError. - """ - # if the setting was modified it may be still a boolean value lets see - tmp = self.get(section, option) - if isinstance(tmp, bool): - return tmp - if not tmp.lower() in self._boolean_states: - raise ValueError('Not a boolean: %s' % tmp) - return self._boolean_states[tmp.lower()] - - def _get_section_option(self, section_option): - """splits ``section_option`` (section.option) in two parts and - returns them as list ``[section, option]``, if: - - * it likes the format of ``section_option`` - * the ``section`` is known - * the ``option`` is known - - Else one of the following exceptions will be thrown: - - * `BadOptionError` - * `NoSectionError` - * `NoOptionError` - """ - sect_opt = section_option.lower().split('.') - # TODO: cache it - if len(sect_opt) != 2: # do we need a regexp to check the format? - raise BadOptionError(_(u"Bad format: '%s' - expected: " - u"section.option") % - get_unicode(section_option)) - if not sect_opt[0] in self._cfg: - raise NoSectionError(sect_opt[0]) - if not sect_opt[1] in self._cfg[sect_opt[0]]: - raise NoOptionError(sect_opt[1], sect_opt[0]) - return sect_opt - - def items(self, section): - """returns an iterable that returns key, value ``tuples`` from - the given ``section``. - """ - if section in self._sections: # check if the section was parsed - sect = self._sections[section] - elif not section in self._cfg: - raise NoSectionError(section) - else: - return ((k, self._cfg[section][k].default) \ - for k in self._cfg[section].iterkeys()) - # still here? Get defaults and merge defaults with configured setting - defaults = dict((k, self._cfg[section][k].default) \ - for k in self._cfg[section].iterkeys()) - defaults.update(sect) - if '__name__' in defaults: - del defaults['__name__'] - return defaults.iteritems() - - def dget(self, option): - """Returns the value of the `option`. - - If the option could not be found in the configuration file, the - configured default value, from ``LazyConfig._cfg`` will be - returned. - - Arguments: - - `option` : string - the configuration option in the form "section.option" - - Throws a `NoDefaultError`, if no default value was passed to - `LazyConfigOption.__init__()` for the `option`. - """ - section, option = self._get_section_option(option) - try: - return self._cfg[section][option].getter(section, option) - except (NoSectionError, NoOptionError): - if not self._cfg[section][option].default is None: # may be False - return self._cfg[section][option].default - else: - raise NoDefaultError(section, option) - - def pget(self, option): - """Returns the value of the `option`.""" - section, option = self._get_section_option(option) - return self._cfg[section][option].getter(section, option) - - def set(self, option, value): - """Set the `value` of the `option`. - - Throws a `ValueError` if `value` couldn't be converted using - `LazyConfigOption.cls`. - """ - # pylint: disable=W0221 - # @pylint: _L A Z Y_ - section, option = self._get_section_option(option) - val = self._cfg[section][option].cls(value) - if self._cfg[section][option].validate: - val = self._cfg[section][option].validate(val) - if not RawConfigParser.has_section(self, section): - self.add_section(section) - RawConfigParser.set(self, section, option, val) - self._modified = True - - def has_section(self, section): - """Checks if `section` is a known configuration section.""" - return section.lower() in self._cfg - - def has_option(self, option): - """Checks if the option (section.option) is a known - configuration option. - """ - # pylint: disable=W0221 - # @pylint: _L A Z Y_ - try: - self._get_section_option(option) - return True - except(BadOptionError, NoSectionError, NoOptionError): - return False - - def sections(self): - """Returns an iterator object for all configuration sections.""" - return self._cfg.iterkeys() - - -class LazyConfigOption(object): - """A simple container class for configuration settings. - - `LazyConfigOption` instances are required by `LazyConfig` instances, - and instances of classes derived from `LazyConfig`, like the - `Config` class. - """ - __slots__ = ('__cls', '__default', '__getter', '__validate') - - def __init__(self, cls, default, getter, validate=None): - """Creates a new `LazyConfigOption` instance. - - Arguments: - - `cls` : type - The class/type of the option's value - `default` - Default value of the option. Use ``None`` if the option should - not have a default value. - `getter` : callable - A method's name of `RawConfigParser` and derived classes, to - get a option's value, e.g. `self.getint`. - `validate` : NoneType or a callable - None or any method, that takes one argument, in order to - check the value, when `LazyConfig.set()` is called. - """ - self.__cls = cls - if not default is None: # enforce the type of the default value - self.__default = self.__cls(default) - else: - self.__default = default - if not callable(getter): - raise TypeError('getter has to be a callable, got a %r' % - getter.__class__.__name__) - self.__getter = getter - if validate and not callable(validate): - raise TypeError('validate has to be callable or None, got a %r' % - validate.__class__.__name__) - self.__validate = validate - - @property - def cls(self): - """The class of the option's value e.g. `str`, `unicode` or `bool`.""" - return self.__cls - - @property - def default(self): - """The option's default value, may be `None`""" - return self.__default - - @property - def getter(self): - """The getter method or function to get the option's value""" - return self.__getter - - @property - def validate(self): - """A method or function to validate the value""" - return self.__validate - - -class Config(LazyConfig): - """This class is for reading vmm's configuration file.""" - - def __init__(self, filename): - """Creates a new Config instance - - Arguments: - - `filename` : str - path to the configuration file - """ - LazyConfig.__init__(self) - self._cfg_filename = filename - self._cfg_file = None - self.__missing = {} - - LCO = LazyConfigOption - bool_t = self.bool_new - self._cfg = { - 'account': { - 'delete_directory': LCO(bool_t, False, self.getboolean), - 'directory_mode': LCO(int, 448, self.getint), - 'disk_usage': LCO(bool_t, False, self.getboolean), - 'password_length': LCO(int, 8, self.getint), - 'random_password': LCO(bool_t, False, self.getboolean), - 'imap': LCO(bool_t, True, self.getboolean), - 'pop3': LCO(bool_t, True, self.getboolean), - 'sieve': LCO(bool_t, True, self.getboolean), - 'smtp': LCO(bool_t, True, self.getboolean), - }, - 'bin': { - 'dovecotpw': LCO(str, '/usr/sbin/dovecotpw', self.get, - exec_ok), - 'du': LCO(str, '/usr/bin/du', self.get, exec_ok), - 'postconf': LCO(str, '/usr/sbin/postconf', self.get, exec_ok), - }, - 'database': { - 'host': LCO(str, 'localhost', self.get), - 'name': LCO(str, 'mailsys', self.get), - 'pass': LCO(str, None, self.get), - 'user': LCO(str, None, self.get), - }, - 'domain': { - 'auto_postmaster': LCO(bool_t, True, self.getboolean), - 'delete_directory': LCO(bool_t, False, self.getboolean), - 'directory_mode': LCO(int, 504, self.getint), - 'force_deletion': LCO(bool_t, False, self.getboolean), - }, - 'mailbox': { - 'folders': LCO(str, 'Drafts:Sent:Templates:Trash', - self.unicode), - 'format': LCO(str, 'maildir', self.get, check_mailbox_format), - 'root': LCO(str, 'Maildir', self.unicode), - 'subscribe': LCO(bool_t, True, self.getboolean), - }, - 'misc': { - 'base_directory': LCO(str, '/srv/mail', self.get, is_dir), - 'crypt_blowfish_rounds': LCO(int, 5, self.getint), - 'crypt_sha256_rounds': LCO(int, 5000, self.getint), - 'crypt_sha512_rounds': LCO(int, 5000, self.getint), - 'dovecot_version': LCO(str, None, self.hexversion, - check_version_format), - 'password_scheme': LCO(str, 'CRAM-MD5', self.get, - verify_scheme), - 'transport': LCO(str, 'dovecot:', self.get), - }, - } - - def load(self): - """Loads the configuration, read only. - - Raises a ConfigError if the configuration syntax is - invalid. - """ - try: - self._cfg_file = open(self._cfg_filename, 'r') - self.readfp(self._cfg_file) - except (MissingSectionHeaderError, ParsingError), err: - raise ConfigError(str(err), CONF_ERROR) - finally: - if self._cfg_file and not self._cfg_file.closed: - self._cfg_file.close() - - def check(self): - """Performs a configuration check. - - Raises a ConfigError if settings w/o a default value are missed. - Or a ConfigValueError if 'misc.dovecot_version' has the wrong - format. - """ - # TODO: There are only two settings w/o defaults. - # So there is no need for cStringIO - if not self.__chk_cfg(): - errmsg = StringIO() - errmsg.write(_(u'Missing options, which have no default value.\n')) - errmsg.write(_(u'Using configuration file: %s\n') % - self._cfg_filename) - for section, options in self.__missing.iteritems(): - errmsg.write(_(u'* Section: %s\n') % section) - for option in options: - errmsg.write((u' %s\n') % option) - raise ConfigError(errmsg.getvalue(), CONF_ERROR) - check_version_format(self.get('misc', 'dovecot_version')) - - def hexversion(self, section, option): - """Converts the version number (e.g.: 1.2.3) from the *option*'s - value to an int.""" - return version_hex(self.get(section, option)) - - def unicode(self, section, option): - """Returns the value of the `option` from `section`, converted - to Unicode.""" - return get_unicode(self.get(section, option)) - - def __chk_cfg(self): - """Checks all section's options for settings w/o a default - value. - - Returns `True` if everything is fine, else `False`. - """ - errors = False - for section in self._cfg.iterkeys(): - missing = [] - for option, value in self._cfg[section].iteritems(): - if (value.default is None and - not RawConfigParser.has_option(self, section, option)): - missing.append(option) - errors = True - if missing: - self.__missing[section] = missing - return not errors - - -def check_mailbox_format(format): - """ - Check if the mailbox format *format* is supported. When the *format* - is supported it will be returned, otherwise a `ConfigValueError` will - be raised. - """ - format = format.lower() - if known_format(format): - return format - raise ConfigValueError(_(u"Unsupported mailbox format: '%s'") % - get_unicode(format)) - - -def check_version_format(version_string): - """Check if the *version_string* has the proper format, e.g.: '1.2.3'. - Returns the validated version string if it has the expected format. - Otherwise a `ConfigValueError` will be raised. - """ - version_re = r'^\d+\.\d+\.(?:\d+|(?:alpha|beta|rc)\d+)$' - if not re.match(version_re, version_string): - raise ConfigValueError(_(u"Not a valid Dovecot version: '%s'") % - get_unicode(version_string)) - return version_string - - -def verify_scheme(scheme): - """Checks if the password scheme *scheme* can be accepted and returns - the verified scheme. - """ - try: - scheme, encoding = _verify_scheme(scheme) - except VMMError, err: # 'cast' it - raise ConfigValueError(err.msg) - if not encoding: - return scheme - return '%s.%s' % (scheme, encoding) - -del _