--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/VirtualMailManager/ext/Postconf.py Tue Sep 16 05:55:54 2008 +0000
@@ -0,0 +1,92 @@
+# -*- coding: UTF-8 -*-
+# Copyright 2007-2008 VEB IT
+# See COPYING for distribution information.
+# $Id$
+
+"""A small - r/o - wrapper class for Postfix' postconf."""
+
+from VirtualMailManager.constants.VERSION import VERSION
+
+__author__ = 'Pascal Volk <p.volk@veb-it.de>'
+__version__ = VERSION
+__revision__ = 'rev '+'$Rev$'.split()[1]
+__date__ = '$Date$'.split()[1]
+
+import re
+from subprocess import Popen, PIPE
+
+import VirtualMailManager.constants.ERROR as ERR
+from VirtualMailManager.Exceptions import VMMException
+
+RE_PC_PARAMS = """^\w+$"""
+RE_PC_VARIABLES = r"""\$\b\w+\b"""
+
+class Postconf:
+ def __init__(self, postconf_bin):
+ """Creates a new Postconf instance.
+
+ Keyword arguments:
+ postconf_bin -- absolute path to Postfix' postconf binary (str)
+ """
+ self.__bin = postconf_bin
+ self.__val = ''
+ re.compile(RE_PC_PARAMS)
+ re.compile(RE_PC_VARIABLES)
+
+ def read(self, parameter, expand_vars=True):
+ """Returns the parameters value.
+
+ If expand_vars is True (default), all variables in the value will be
+ expanded:
+ e.g. mydestination -> mail.example.com, localhost.example.com, localhost
+ Otherwise the value may contain one or more variables.
+ e.g. mydestination -> $myhostname, localhost.$mydomain, localhost
+
+ Keyword arguments:
+ parameter -- the name of a Postfix configuration parameter (str)
+ expand_vars -- default True (bool)
+ """
+ if not re.match(RE_PC_PARAMS, parameter):
+ raise VMMException(_(u'The value »%s« looks not like a valid\
+ postfix configuration parameter name.'), ERR.INVALID_AGUMENT)
+ self.__val = self.__read(parameter)
+ if expand_vars:
+ self.__expandVars()
+ return self.__val
+
+ def __expandVars(self):
+ while True:
+ pvars = set(re.findall(RE_PC_VARIABLES, self.__val))
+ pvars_len = len(pvars)
+ if pvars_len < 1:
+ break
+ if pvars_len > 1:
+ self.__expandMultiVars(self.__readMulti(pvars))
+ continue
+ for var in pvars:
+ self.__val = self.__val.replace(var, self.__read(var[1:]))
+
+ def __expandMultiVars(self, old_new):
+ for old, new in old_new.items():
+ self.__val = self.__val.replace('$'+old, new)
+
+ def __read(self, parameter):
+ out, err = Popen([self.__bin, '-h', parameter], stdout=PIPE,
+ stderr=PIPE).communicate()
+ if len(err):
+ raise Exception, err.strip()
+ return out.strip()
+
+ def __readMulti(self, parameters):
+ cmd = [self.__bin]
+ for parameter in parameters:
+ cmd.append(parameter[1:])
+ out, err = Popen(cmd, stdout=PIPE, stderr=PIPE).communicate()
+ if len(err):
+ raise Exception, err.strip()
+ par_val = {}
+ for line in out.splitlines():
+ par, val = line.split(' = ')
+ par_val[par] = val
+ return par_val
+