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Editing: ls-dbus-backend

#!/usr/bin/python3

import dbus
import dbus.mainloop.glib
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
import dbus.service
from gi.repository import GObject
import logging
import re
import subprocess
import sys

import LanguageSelector.macros

from LanguageSelector.utils import *

DATADIR="/usr/share/language-selector/"

class LanguageSelectorServer(dbus.service.Object):
    def __init__(self, bus=dbus.SystemBus(), datadir=DATADIR):
            bus_name = dbus.service.BusName('com.ubuntu.LanguageSelector',
                                            bus=bus)
            dbus.service.Object.__init__(self, bus_name, '/')
            self._datadir = "/usr/share/language-selector/"
            self._re_locale = re.compile(r'^[\w.@:-]+$')

def _authWithPolicyKit(self, sender, connection, priv):
        logging.debug("_authWithPolicyKit")
        system_bus = dbus.SystemBus()
        obj = system_bus.get_object("org.freedesktop.PolicyKit1",
                                    "/org/freedesktop/PolicyKit1/Authority",
                                    "org.freedesktop.PolicyKit1.Authority")
        policykit = dbus.Interface(obj, "org.freedesktop.PolicyKit1.Authority")
        subject = ('system-bus-name',
                   { 'name': dbus.String(sender, variant_level = 1) }
                  )
        details = { '' : '' }
        flags = dbus.UInt32(1) #   AllowUserInteraction = 0x00000001
        cancel_id = ''
        (ok, notused, details) = policykit.CheckAuthorization(
            subject, priv, details, flags, cancel_id)
        return ok

@dbus.service.method(dbus_interface='com.ubuntu.LanguageSelector',
			 in_signature="s", 
			 out_signature="b",
                         connection_keyword='connection',
			 sender_keyword='sender')
    def SetSystemDefaultLanguageEnv(self, sysLanguage, sender, connection):
        """ sysLanguage - the default system LANGUAGE and LANG """
        logging.debug("SetSystemDefaultLanguage")
        if not self._re_locale.search(sysLanguage):
            logging.error('SetSystemDefaultLanguage: Invalid locale "%s", rejecting', sysLanguage)
            return False
        if not self._authWithPolicyKit(sender, connection, "com.ubuntu.languageselector.setsystemdefaultlanguage"):
            return False
        conffiles = ["/etc/default/locale"]
        findString = "LANGUAGE="
        setString = "LANGUAGE=\"%s\"\n" % sysLanguage
        find_string_and_replace(findString, setString, conffiles)
        defaultLanguageLocale = language2locale(sysLanguage)
        findString = "LANG="
        setString = "LANG=\"%s\"\n" % defaultLanguageLocale
        find_string_and_replace(findString, setString, conffiles)
        return True

@dbus.service.method(dbus_interface='com.ubuntu.LanguageSelector',
			 in_signature="s", 
			 out_signature="b",
                         connection_keyword='connection',
			 sender_keyword='sender')
    def SetSystemDefaultFormatsEnv(self, sysFormats, sender, connection):
        """ sysFormats: various LC_* variables (de_DE.UTF-8) """
        logging.debug("SetSystemDefaultFormatsEnv")
        if not self._re_locale.search(sysFormats):
            logging.error('SetSystemDefaultFormatsEnv: Invalid locale "%s", rejecting', sysFormats)
            return False
        if not self._authWithPolicyKit(sender, connection, "com.ubuntu.languageselector.setsystemdefaultlanguage"):
            return False
        conffiles = ["/etc/default/locale"]
        macr = LanguageSelector.macros.LangpackMacros(self._datadir, sysFormats)
        defaultFormatsLocale = macr['SYSLOCALE']
        for var in 'LC_NUMERIC', 'LC_TIME', 'LC_MONETARY', 'LC_PAPER', 'LC_IDENTIFICATION', \
                   'LC_NAME', 'LC_ADDRESS', 'LC_TELEPHONE', 'LC_MEASUREMENT':
            findString = "%s=" % var
            setString = "%s=\"%s\"\n" % (var, defaultFormatsLocale)
            find_string_and_replace(findString, setString, conffiles)
        """ /etc/papersize ('a4' or 'letter') """
        papersize = subprocess.check_output(
            ['/usr/share/language-tools/locale2papersize', defaultFormatsLocale],
            universal_newlines=True)
        with open('/etc/papersize', 'w') as f:
            f.write(papersize)
        return True

if __name__ == "__main__":
        # FIXME: use argparse
        if len(sys.argv) > 1 and sys.argv[1] == "--debug":
            logging.basicConfig(level=logging.DEBUG)
        server = LanguageSelectorServer()
        GObject.MainLoop().run()

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