helpers.py

# -*- coding:utf-8 -*-
## src/common/helpers.py
##
## Copyright (C) 2003-2008 Yann Leboulanger <asterix AT lagaule.org>
## Copyright (C) 2005-2006 Dimitur Kirov <dkirov AT gmail.com>
##                         Nikos Kouremenos <kourem AT gmail.com>
## Copyright (C) 2006 Alex Mauer <hawke AT hawkesnest.net>
## Copyright (C) 2006-2007 Travis Shirk <travis AT pobox.com>
## Copyright (C) 2006-2008 Jean-Marie Traissard <jim AT lapin.org>
## Copyright (C) 2007 Lukas Petrovicky <lukas AT petrovicky.net>
##                    James Newton <redshodan AT gmail.com>
##                    Julien Pivotto <roidelapluie AT gmail.com>
## Copyright (C) 2007-2008 Stephan Erb <steve-e AT h3c.de>
## Copyright (C) 2008 Brendan Taylor <whateley AT gmail.com>
##                    Jonathan Schleifer <js-gajim AT webkeks.org>
##
## This file is part of Gajim.
##
## Gajim is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## Gajim is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
##

import re
import locale
import os
import subprocess
import urllib
import errno
import select
import base64
import hashlib
import caps_cache

from encodings.punycode import punycode_encode
from string import Template

from i18n import Q_
from i18n import ngettext

try:
	import winsound # windows-only built-in module for playing wav
	import win32api
	import win32con
except Exception:
	pass

special_groups = (_('Transports'), _('Not in Roster'), _('Observers'), _('Groupchats'))

class InvalidFormat(Exception):
	pass

def decompose_jid(jidstring):
	user = None
	server = None
	resource = None

	# Search for delimiters
	user_sep = jidstring.find('@')
	res_sep = jidstring.find('/')

	if user_sep == -1:
		if res_sep == -1:
			# host
			server = jidstring
		else:
			# host/resource
			server = jidstring[0:res_sep]
			resource = jidstring[res_sep + 1:] or None
	else:
		if res_sep == -1:
			# user@host
			user = jidstring[0:user_sep] or None
			server = jidstring[user_sep + 1:]
		else:
			if user_sep < res_sep:
				# user@host/resource
				user = jidstring[0:user_sep] or None
				server = jidstring[user_sep + 1:user_sep + (res_sep - user_sep)]
				resource = jidstring[res_sep + 1:] or None
			else:
				# server/resource (with an @ in resource)
				server = jidstring[0:res_sep]
				resource = jidstring[res_sep + 1:] or None
	return user, server, resource

def parse_jid(jidstring):
	"""
	Perform stringprep on all JID fragments from a string and return the full
	jid
	"""
	# This function comes from http://svn.twistedmatrix.com/cvs/trunk/twisted/words/protocols/jabber/jid.py

	return prep(*decompose_jid(jidstring))

def idn_to_ascii(host):
	"""
	Convert IDN (Internationalized Domain Names) to ACE (ASCII-compatible
	encoding)
	"""
	from encodings import idna
	labels = idna.dots.split(host)
	converted_labels = []
	for label in labels:
		converted_labels.append(idna.ToASCII(label))
	return ".".join(converted_labels)

def ascii_to_idn(host):
	"""
	Convert ACE (ASCII-compatible encoding) to IDN (Internationalized Domain
	Names)
	"""
	from encodings import idna
	labels = idna.dots.split(host)
	converted_labels = []
	for label in labels:
		converted_labels.append(idna.ToUnicode(label))
	return ".".join(converted_labels)

def parse_resource(resource):
	"""
	Perform stringprep on resource and return it
	"""
	if resource:
		try:
			from xmpp.stringprepare import resourceprep
			return resourceprep.prepare(unicode(resource))
		except UnicodeError:
			raise InvalidFormat, 'Invalid character in resource.'

def prep(user, server, resource):
	"""
	Perform stringprep on all JID fragments and return the full jid
	"""
	# This function comes from
	#http://svn.twistedmatrix.com/cvs/trunk/twisted/words/protocols/jabber/jid.py
	if user:
		try:
			from xmpp.stringprepare import nodeprep
			user = nodeprep.prepare(unicode(user))
		except UnicodeError:
			raise InvalidFormat, _('Invalid character in username.')
	else:
		user = None

	if not server:
		raise InvalidFormat, _('Server address required.')
	else:
		try:
			from xmpp.stringprepare import nameprep
			server = nameprep.prepare(unicode(server))
		except UnicodeError:
			raise InvalidFormat, _('Invalid character in hostname.')

	if resource:
		try:
			from xmpp.stringprepare import resourceprep
			resource = resourceprep.prepare(unicode(resource))
		except UnicodeError:
			raise InvalidFormat, _('Invalid character in resource.')
	else:
		resource = None

	if user:
		if resource:
			return '%s@%s/%s' % (user, server, resource)
		else:
			return '%s@%s' % (user, server)
	else:
		if resource:
			return '%s/%s' % (server, resource)
		else:
			return server

def windowsify(s):
	if os.name == 'nt':
		return s.capitalize()
	return s

def temp_failure_retry(func, *args, **kwargs):
	while True:
		try:
			return func(*args, **kwargs)
		except (os.error, IOError, select.error), ex:
			if ex.errno == errno.EINTR:
				continue
			else:
				raise

def get_uf_show(show, use_mnemonic = False):
	"""
	Return a userfriendly string for dnd/xa/chat and make all strings
	translatable

	If use_mnemonic is True, it adds _ so GUI should call with True for
	accessibility issues
	"""
	if show == 'dnd':
		if use_mnemonic:
			uf_show = _('_Busy')
		else:
			uf_show = _('Busy')
	elif show == 'xa':
		if use_mnemonic:
			uf_show = _('_Not Available')
		else:
			uf_show = _('Not Available')
	elif show == 'chat':
		if use_mnemonic:
			uf_show = _('_Free for Chat')
		else:
			uf_show = _('Free for Chat')
	elif show == 'online':
		if use_mnemonic:
			uf_show = _('_Available')
		else:
			uf_show = _('Available')
	elif show == 'connecting':
		uf_show = _('Connecting')
	elif show == 'away':
		if use_mnemonic:
			uf_show = _('A_way')
		else:
			uf_show = _('Away')
	elif show == 'offline':
		if use_mnemonic:
			uf_show = _('_Offline')
		else:
			uf_show = _('Offline')
	elif show == 'invisible':
		if use_mnemonic:
			uf_show = _('_Invisible')
		else:
			uf_show = _('Invisible')
	elif show == 'not in roster':
		uf_show = _('Not in Roster')
	elif show == 'requested':
		uf_show = Q_('?contact has status:Unknown')
	else:
		uf_show = Q_('?contact has status:Has errors')
	return unicode(uf_show)

def get_uf_sub(sub):
	if sub == 'none':
		uf_sub = Q_('?Subscription we already have:None')
	elif sub == 'to':
		uf_sub = _('To')
	elif sub == 'from':
		uf_sub = _('From')
	elif sub == 'both':
		uf_sub = _('Both')
	else:
		uf_sub = sub

	return unicode(uf_sub)

def get_uf_ask(ask):
	if ask is None:
		uf_ask = Q_('?Ask (for Subscription):None')
	elif ask == 'subscribe':
		uf_ask = _('Subscribe')
	else:
		uf_ask = ask

	return unicode(uf_ask)

def get_uf_role(role, plural = False):
	''' plural determines if you get Moderators or Moderator'''
	if role == 'none':
		role_name = Q_('?Group Chat Contact Role:None')
	elif role == 'moderator':
		if plural:
			role_name = _('Moderators')
		else:
			role_name = _('Moderator')
	elif role == 'participant':
		if plural:
			role_name = _('Participants')
		else:
			role_name = _('Participant')
	elif role == 'visitor':
		if plural:
			role_name = _('Visitors')
		else:
			role_name = _('Visitor')
	return role_name

def get_uf_affiliation(affiliation):
	'''Get a nice and translated affilition for muc'''
	if affiliation == 'none':
		affiliation_name = Q_('?Group Chat Contact Affiliation:None')
	elif affiliation == 'owner':
		affiliation_name = _('Owner')
	elif affiliation == 'admin':
		affiliation_name = _('Administrator')
	elif affiliation == 'member':
		affiliation_name = _('Member')
	else: # Argl ! An unknown affiliation !
		affiliation_name = affiliation.capitalize()
	return affiliation_name

def get_sorted_keys(adict):
	keys = sorted(adict.keys())
	return keys

def to_one_line(msg):
	msg = msg.replace('\\', '\\\\')
	msg = msg.replace('\n', '\\n')
	# s1 = 'test\ntest\\ntest'
	# s11 = s1.replace('\\', '\\\\')
	# s12 = s11.replace('\n', '\\n')
	# s12
	# 'test\\ntest\\\\ntest'
	return msg

def from_one_line(msg):
	# (?<!\\) is a lookbehind assertion which asks anything but '\'
	# to match the regexp that follows it

	# So here match '\\n' but not if you have a '\' before that
	expr = re.compile(r'(?<!\\)\\n')
	msg = expr.sub('\n', msg)
	msg = msg.replace('\\\\', '\\')
	# s12 = 'test\\ntest\\\\ntest'
	# s13 = re.sub('\n', s12)
	# s14 s13.replace('\\\\', '\\')
	# s14
	# 'test\ntest\\ntest'
	return msg

def get_uf_chatstate(chatstate):
	"""
	Remove chatstate jargon and returns user friendly messages
	"""
	if chatstate == 'active':
		return _('is paying attention to the conversation')
	elif chatstate == 'inactive':
		return _('is doing something else')
	elif chatstate == 'composing':
		return _('is composing a message...')
	elif chatstate == 'paused':
		#paused means he or she was composing but has stopped for a while
		return _('paused composing a message')
	elif chatstate == 'gone':
		return _('has closed the chat window or tab')
	return ''

def is_in_path(command, return_abs_path=False):
	"""
	Return True if 'command' is found in one of the directories in the user's
	path. If 'return_abs_path' is True, return the absolute path of the first
	found command instead. Return False otherwise and on errors
	"""
	for directory in os.getenv('PATH').split(os.pathsep):
		try:
			if command in os.listdir(directory):
				if return_abs_path:
					return os.path.join(directory, command)
				else:
					return True
		except OSError:
			# If the user has non directories in his path
			pass
	return False

def exec_command(command):
	subprocess.Popen('%s &' % command, shell=True).wait()

def build_command(executable, parameter):
	# we add to the parameter (can hold path with spaces)
	# "" so we have good parsing from shell
	parameter = parameter.replace('"', '\\"') # but first escape "
	command = '%s "%s"' % (executable, parameter)
	return command

def get_file_path_from_dnd_dropped_uri(uri):
	path = urllib.unquote(uri) # escape special chars
	path = path.strip('\r\n\x00') # remove \r\n and NULL
	# get the path to file
	if re.match('^file:///[a-zA-Z]:/', path): # windows
		path = path[8:] # 8 is len('file:///')
	elif path.startswith('file://'): # nautilus, rox
		path = path[7:] # 7 is len('file://')
	elif path.startswith('file:'): # xffm
		path = path[5:] # 5 is len('file:')
	return path

def from_xs_boolean_to_python_boolean(value):
	# this is xs:boolean so 'true', 'false', '1', '0'
	# convert those to True/False (python booleans)
	if value in ('1', 'true'):
		val = True
	else: # '0', 'false' or anything else
		val = False

	return val

def get_xmpp_show(show):
	if show in ('online', 'offline'):
		return None
	return show

def get_output_of_command(command):
	try:
		child_stdin, child_stdout = os.popen2(command)
	except ValueError:
		return None

	output = child_stdout.readlines()
	child_stdout.close()
	child_stdin.close()

	return output

def decode_string(string):
	"""
	Try to decode (to make it Unicode instance) given string
	"""
	if isinstance(string, unicode):
		return string
	# by the time we go to iso15 it better be the one else we show bad characters
	encodings = (locale.getpreferredencoding(), 'utf-8', 'iso-8859-15')
	for encoding in encodings:
		try:
			string = string.decode(encoding)
		except UnicodeError:
			continue
		break

	return string

def ensure_utf8_string(string):
	"""
	Make sure string is in UTF-8
	"""
	try:
		string = decode_string(string).encode('utf-8')
	except Exception:
		pass
	return string

def get_windows_reg_env(varname, default=''):
	"""
	Ask for paths commonly used but not exposed as ENVs in english Windows 2003
	those are:
		'AppData' = %USERPROFILE%\Application Data (also an ENV)
		'Desktop' = %USERPROFILE%\Desktop
		'Favorites' = %USERPROFILE%\Favorites
		'NetHood' = %USERPROFILE%\NetHood
		'Personal' = D:\My Documents (PATH TO MY DOCUMENTS)
		'PrintHood' = %USERPROFILE%\PrintHood
		'Programs' = %USERPROFILE%\Start Menu\Programs
		'Recent' = %USERPROFILE%\Recent
		'SendTo' = %USERPROFILE%\SendTo
		'Start Menu' = %USERPROFILE%\Start Menu
		'Startup' = %USERPROFILE%\Start Menu\Programs\Startup
		'Templates' = %USERPROFILE%\Templates
		'My Pictures' = D:\My Documents\My Pictures
		'Local Settings' = %USERPROFILE%\Local Settings
		'Local AppData' = %USERPROFILE%\Local Settings\Application Data
		'Cache' = %USERPROFILE%\Local Settings\Temporary Internet Files
		'Cookies' = %USERPROFILE%\Cookies
		'History' = %USERPROFILE%\Local Settings\History
	"""
	if os.name != 'nt':
		return ''

	val = default
	try:
		rkey = win32api.RegOpenKey(win32con.HKEY_CURRENT_USER,
r'Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders')
		try:
			val = str(win32api.RegQueryValueEx(rkey, varname)[0])
			val = win32api.ExpandEnvironmentStrings(val) # expand using environ
		except Exception:
			pass
	finally:
		win32api.RegCloseKey(rkey)
	return val

def get_my_pictures_path():
	"""
	Windows-only atm
	"""
	return get_windows_reg_env('My Pictures')

def get_desktop_path():
	if os.name == 'nt':
		path = get_windows_reg_env('Desktop')
	else:
		path = os.path.join(os.path.expanduser('~'), 'Desktop')
	return path

def get_documents_path():
	if os.name == 'nt':
		path = get_windows_reg_env('Personal')
	else:
		path = os.path.expanduser('~')
	return path

def sanitize_filename(filename):
	"""
	Make sure the filename we will write does contain only acceptable and latin
	characters, and is not too long (in that case hash it)
	"""
	# 48 is the limit
	if len(filename) > 48:
		hash = hashlib.md5(filename)
		filename = base64.b64encode(hash.digest())

	filename = punycode_encode(filename) # make it latin chars only
	filename = filename.replace('/', '_')
	if os.name == 'nt':
		filename = filename.replace('?', '_').replace(':', '_')\
			.replace('\\', '_').replace('"', "'").replace('|', '_')\
			.replace('*', '_').replace('<', '_').replace('>', '_')

	return filename

def reduce_chars_newlines(text, max_chars = 0, max_lines = 0):
	"""
	Cut the chars after 'max_chars' on each line and show only the first
	'max_lines'

	If any of the params is not present (None or 0) the action on it is not
	performed
	"""
	def _cut_if_long(string):
		if len(string) > max_chars:
			string = string[:max_chars - 3] + '...'
		return string

	if isinstance(text, str):
		text = text.decode('utf-8')

	if max_lines == 0:
		lines = text.split('\n')
	else:
		lines = text.split('\n', max_lines)[:max_lines]
	if max_chars > 0:
		if lines:
			lines = [_cut_if_long(e) for e in lines]
	if lines:
		reduced_text = '\n'.join(lines)
		if reduced_text != text:
			reduced_text += '...'
	else:
		reduced_text = ''
	return reduced_text

def get_account_status(account):
	status = reduce_chars_newlines(account['status_line'], 100, 1)
	return status

def get_avatar_path(prefix):
	"""
	Return the filename of the avatar, distinguishes between user- and contact-
	provided one. Return None if no avatar was found at all.  prefix is the path
	to the requested avatar just before the ".png" or ".jpeg"
	"""
	# First, scan for a local, user-set avatar
	for type_ in ('jpeg', 'png'):
		file_ = prefix + '_local.' + type_
		if os.path.exists(file_):
			return file_
	# If none available, scan for a contact-provided avatar
	for type_ in ('jpeg', 'png'):
		file_ = prefix + '.' + type_
		if os.path.exists(file_):
			return file_
	return None

def datetime_tuple(timestamp):
	"""
	Convert timestamp using strptime and the format: %Y%m%dT%H:%M:%S

	Because of various datetime formats are used the following exceptions
	are handled:
		- Optional milliseconds appened to the string are removed
		- Optional Z (that means UTC) appened to the string are removed
		- XEP-082 datetime strings have all '-' cahrs removed to meet
		  the above format.
	"""
	timestamp = timestamp.split('.')[0]
	timestamp = timestamp.replace('-', '')
	timestamp = timestamp.replace('z', '')
	timestamp = timestamp.replace('Z', '')
	from time import strptime
	return strptime(timestamp, '%Y%m%dT%H:%M:%S')

# import gajim only when needed (after decode_string is defined) see #4764

import gajim

def convert_bytes(string):
	suffix = ''
	# IEC standard says KiB = 1024 bytes KB = 1000 bytes
	# but do we use the standard?
	use_kib_mib = gajim.config.get('use_kib_mib')
	align = 1024.
	bytes = float(string)
	if bytes >= align:
		bytes = round(bytes/align, 1)
		if bytes >= align:
			bytes = round(bytes/align, 1)
			if bytes >= align:
				bytes = round(bytes/align, 1)
				if use_kib_mib:
					#GiB means gibibyte
					suffix = _('%s GiB')
				else:
					#GB means gigabyte
					suffix = _('%s GB')
			else:
				if use_kib_mib:
					#MiB means mibibyte
					suffix = _('%s MiB')
				else:
					#MB means megabyte
					suffix = _('%s MB')
		else:
			if use_kib_mib:
				#KiB means kibibyte
				suffix = _('%s KiB')
			else:
				#KB means kilo bytes
				suffix = _('%s KB')
	else:
		#B means bytes
		suffix = _('%s B')
	return suffix % unicode(bytes)

def get_contact_dict_for_account(account):
	"""
	Create a dict of jid, nick -> contact with all contacts of account.

	Can be used for completion lists
	"""
	contacts_dict = {}
	for jid in gajim.contacts.get_jid_list(account):
		contact = gajim.contacts.get_contact_with_highest_priority(account,
				jid)
		contacts_dict[jid] = contact
		name = contact.name
		if name in contacts_dict:
			contact1 = contacts_dict[name]
			del contacts_dict[name]
			contacts_dict['%s (%s)' % (name, contact1.jid)] = contact1
			contacts_dict['%s (%s)' % (name, jid)] = contact
		else:
			if contact.name == gajim.get_nick_from_jid(jid):
				del contacts_dict[jid]
			contacts_dict[name] = contact
	return contacts_dict

def launch_browser_mailer(kind, uri):
	#kind = 'url' or 'mail'
	if os.name == 'nt':
		try:
			os.startfile(uri) # if pywin32 is installed we open
		except Exception:
			pass

	else:
		if kind in ('mail', 'sth_at_sth') and not uri.startswith('mailto:'):
			uri = 'mailto:' + uri

		if kind == 'url' and uri.startswith('www.'):
			uri = 'http://' + uri

		if gajim.config.get('openwith') == 'gnome-open':
			command = 'gnome-open'
		elif gajim.config.get('openwith') == 'kfmclient exec':
			command = 'kfmclient exec'
		elif gajim.config.get('openwith') == 'exo-open':
			command = 'exo-open'
		elif gajim.config.get('openwith') == 'custom':
			if kind == 'url':
				command = gajim.config.get('custombrowser')
			elif kind in ('mail', 'sth_at_sth'):
				command = gajim.config.get('custommailapp')
			if command == '': # if no app is configured
				return

		command = build_command(command, uri)
		try:
			exec_command(command)
		except Exception:
			pass

def launch_file_manager(path_to_open):
	if os.name == 'nt':
		try:
			os.startfile(path_to_open) # if pywin32 is installed we open
		except Exception:
			pass
	else:
		if gajim.config.get('openwith') == 'gnome-open':
			command = 'gnome-open'
		elif gajim.config.get('openwith') == 'kfmclient exec':
			command = 'kfmclient exec'
		elif gajim.config.get('openwith') == 'exo-open':
			command = 'exo-open'
		elif gajim.config.get('openwith') == 'custom':
			command = gajim.config.get('custom_file_manager')
		if command == '': # if no app is configured
			return
		command = build_command(command, path_to_open)
		try:
			exec_command(command)
		except Exception:
			pass

def play_sound(event):
	if not gajim.config.get('sounds_on'):
		return
	path_to_soundfile = gajim.config.get_per('soundevents', event, 'path')
	play_sound_file(path_to_soundfile)

def check_soundfile_path(file, dirs=(gajim.gajimpaths.data_root,
gajim.DATA_DIR)):
	"""
	Check if the sound file exists

	:param file: the file to check, absolute or relative to 'dirs' path
	:param dirs: list of knows paths to fallback if the file doesn't exists
					 (eg: ~/.gajim/sounds/, DATADIR/sounds...).
	:return      the path to file or None if it doesn't exists.
	"""
	if not file:
		return None
	elif os.path.exists(file):
		return file

	for d in dirs:
		d = os.path.join(d, 'sounds', file)
		if os.path.exists(d):
			return d
	return None

def strip_soundfile_path(file, dirs=(gajim.gajimpaths.data_root,
gajim.DATA_DIR), abs=True):
	"""
	Remove knowns paths from a sound file

	Filechooser returns absolute path. If path is a known fallback path, we remove it.
	So config have no hardcoded path	to DATA_DIR and text in textfield is shorther.
	param: file: the filename to strip.
	param: dirs: list of knowns paths from which the filename should be stripped.
	param:  abs: force absolute path on dirs
	"""
	if not file:
		return None

	name = os.path.basename(file)
	for d in dirs:
		d = os.path.join(d, 'sounds', name)
		if abs:
			d = os.path.abspath(d)
		if file == d:
			return name
	return file

def play_sound_file(path_to_soundfile):
	if path_to_soundfile == 'beep':
		exec_command('beep')
		return
	path_to_soundfile = check_soundfile_path(path_to_soundfile)
	if path_to_soundfile is None:
		return
	elif os.name == 'nt':
		try:
			winsound.PlaySound(path_to_soundfile,
				winsound.SND_FILENAME|winsound.SND_ASYNC)
		except Exception:
			pass
	elif os.name == 'posix':
		if gajim.config.get('soundplayer') == '':
			return
		player = gajim.config.get('soundplayer')
		command = build_command(player, path_to_soundfile)
		exec_command(command)

def get_global_show():
	maxi = 0
	for account in gajim.connections:
		if not gajim.config.get_per('accounts', account,
		'sync_with_global_status'):
			continue
		connected = gajim.connections[account].connected
		if connected > maxi:
			maxi = connected
	return gajim.SHOW_LIST[maxi]

def get_global_status():
	maxi = 0
	for account in gajim.connections:
		if not gajim.config.get_per('accounts', account,
		'sync_with_global_status'):
			continue
		connected = gajim.connections[account].connected
		if connected > maxi:
			maxi = connected
			status = gajim.connections[account].status
	return status


def statuses_unified():
	"""
	Test if all statuses are the same
	"""
	reference = None
	for account in gajim.connections:
		if not gajim.config.get_per('accounts', account,
		'sync_with_global_status'):
			continue
		if reference is None:
			reference = gajim.connections[account].connected
		elif reference != gajim.connections[account].connected:
			return False
	return True

def get_icon_name_to_show(contact, account = None):
	"""
	Get the icon name to show in online, away, requested, etc
	"""
	if account and gajim.events.get_nb_roster_events(account, contact.jid):
		return 'event'
	if account and gajim.events.get_nb_roster_events(account,
	contact.get_full_jid()):
		return 'event'
	if account and account in gajim.interface.minimized_controls and \
	contact.jid in gajim.interface.minimized_controls[account] and gajim.interface.\
		minimized_controls[account][contact.jid].get_nb_unread_pm() > 0:
		return 'event'
	if account and contact.jid in gajim.gc_connected[account]:
		if gajim.gc_connected[account][contact.jid]:
			return 'muc_active'
		else:
			return 'muc_inactive'
	if contact.jid.find('@') <= 0: # if not '@' or '@' starts the jid ==> agent
		return contact.show
	if contact.sub in ('both', 'to'):
		return contact.show
	if contact.ask == 'subscribe':
		return 'requested'
	transport = gajim.get_transport_name_from_jid(contact.jid)
	if transport:
		return contact.show
	if contact.show in gajim.SHOW_LIST:
		return contact.show
	return 'not in roster'

def get_full_jid_from_iq(iq_obj):
	"""
	Return the full jid (with resource) from an iq as unicode
	"""
	return parse_jid(str(iq_obj.getFrom()))

def get_jid_from_iq(iq_obj):
	"""
	Return the jid (without resource) from an iq as unicode
	"""
	jid = get_full_jid_from_iq(iq_obj)
	return gajim.get_jid_without_resource(jid)

def get_auth_sha(sid, initiator, target):
	"""
	Return sha of sid + initiator + target used for proxy auth
	"""
	return hashlib.sha1("%s%s%s" % (sid, initiator, target)).hexdigest()

def remove_invalid_xml_chars(string):
	if string:
		string = re.sub(gajim.interface.invalid_XML_chars_re, '', string)
	return string

distro_info = {
	'Arch Linux': '/etc/arch-release',
	'Aurox Linux': '/etc/aurox-release',
	'Conectiva Linux': '/etc/conectiva-release',
	'CRUX': '/usr/bin/crux',
	'Debian GNU/Linux': '/etc/debian_release',
	'Debian GNU/Linux': '/etc/debian_version',
	'Fedora Linux': '/etc/fedora-release',
	'Gentoo Linux': '/etc/gentoo-release',
	'Linux from Scratch': '/etc/lfs-release',
	'Mandrake Linux': '/etc/mandrake-release',
	'Slackware Linux': '/etc/slackware-release',
	'Slackware Linux': '/etc/slackware-version',
	'Solaris/Sparc': '/etc/release',
	'Source Mage': '/etc/sourcemage_version',
	'SUSE Linux': '/etc/SuSE-release',
	'Sun JDS': '/etc/sun-release',
	'PLD Linux': '/etc/pld-release',
	'Yellow Dog Linux': '/etc/yellowdog-release',
	# many distros use the /etc/redhat-release for compatibility
	# so Redhat is the last
	'Redhat Linux': '/etc/redhat-release'
}

def get_random_string_16():
	"""
	Create random string of length 16
	"""
	rng = range(65, 90)
	rng.extend(range(48, 57))
	char_sequence = [chr(e) for e in rng]
	from random import sample
	return ''.join(sample(char_sequence, 16))

def get_os_info():
	if gajim.os_info:
		return gajim.os_info
	if os.name == 'nt':
		# platform.release() seems to return the name of the windows
		ver = sys.getwindowsversion()
		ver_format = ver[3], ver[0], ver[1]
		win_version = {
			(1, 4, 0): '95',
			(1, 4, 10): '98',
			(1, 4, 90): 'ME',
			(2, 4, 0): 'NT',
			(2, 5, 0): '2000',
			(2, 5, 1): 'XP',
			(2, 5, 2): '2003',
			(2, 6, 0): 'Vista',
			(2, 6, 1): '7',
		}
		if ver_format in win_version:
			os_info = 'Windows' + ' ' + win_version[ver_format]
		else:
			os_info = 'Windows'
		gajim.os_info = os_info
		return os_info
	elif os.name == 'posix':
		executable = 'lsb_release'
		params = ' --description --codename --release --short'
		full_path_to_executable = is_in_path(executable, return_abs_path = True)
		if full_path_to_executable:
			command = executable + params
			p = subprocess.Popen([command], shell=True, stdin=subprocess.PIPE,
				stdout=subprocess.PIPE, close_fds=True)
			p.wait()
			output = temp_failure_retry(p.stdout.readline).strip()
			# some distros put n/a in places, so remove those
			output = output.replace('n/a', '').replace('N/A', '')
			gajim.os_info = output
			return output

		# lsb_release executable not available, so parse files
		for distro_name in distro_info:
			path_to_file = distro_info[distro_name]
			if os.path.exists(path_to_file):
				if os.access(path_to_file, os.X_OK):
					# the file is executable (f.e. CRUX)
					# yes, then run it and get the first line of output.
					text = get_output_of_command(path_to_file)[0]
				else:
					fd = open(path_to_file)
					text = fd.readline().strip() # get only first line
					fd.close()
					if path_to_file.endswith('version'):
						# sourcemage_version and slackware-version files
						# have all the info we need (name and version of distro)
						if not os.path.basename(path_to_file).startswith(
						'sourcemage') or not\
						os.path.basename(path_to_file).startswith('slackware'):
							text = distro_name + ' ' + text
					elif path_to_file.endswith('aurox-release') or \
					path_to_file.endswith('arch-release'):
						# file doesn't have version
						text = distro_name
					elif path_to_file.endswith('lfs-release'): # file just has version
						text = distro_name + ' ' + text
				os_info = text.replace('\n', '')
				gajim.os_info = os_info
				return os_info

		# our last chance, ask uname and strip it
		uname_output = get_output_of_command('uname -sr')
		if uname_output is not None:
			os_info = uname_output[0] # only first line
			gajim.os_info = os_info
			return os_info
	os_info = 'N/A'
	gajim.os_info = os_info
	return os_info


def allow_showing_notification(account, type_ = 'notify_on_new_message',
		advanced_notif_num = None, is_first_message = True):