--- 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 _