XEP-0045: Split __init__

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
This commit is contained in:
Maxime “pep” Buquet 2020-05-29 17:42:49 +02:00
parent a3d343b253
commit 605a58a864
2 changed files with 340 additions and 324 deletions

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@ -1,334 +1,14 @@
"""
Slixmpp: The Slick XMPP Library
Copyright (C) 2010 Nathanael C. Fritz
Copyright (C) 2020 "Maxime “pep” Buquet <pep@bouah.net>"
This file is part of Slixmpp.
See the file LICENSE for copying permission.
"""
import logging
from slixmpp import Presence, Message
from slixmpp.plugins import BasePlugin, register_plugin
from slixmpp.xmlstream import register_stanza_plugin, ElementBase, JID, ET
from slixmpp.xmlstream.handler.callback import Callback
from slixmpp.xmlstream.matcher.xpath import MatchXPath
from slixmpp.xmlstream.matcher.xmlmask import MatchXMLMask
from slixmpp.exceptions import IqError, IqTimeout
from slixmpp.plugins import register_plugin
from slixmpp.plugins.xep_0045 import stanza
from slixmpp.plugins.xep_0045.muc import XEP_0045
from slixmpp.plugins.xep_0045.stanza import MUCPresence
log = logging.getLogger(__name__)
class XEP_0045(BasePlugin):
"""
Implements XEP-0045 Multi-User Chat
"""
name = 'xep_0045'
description = 'XEP-0045: Multi-User Chat'
dependencies = {'xep_0030', 'xep_0004'}
def plugin_init(self):
self.rooms = {}
self.our_nicks = {}
self.xep = '0045'
# load MUC support in presence stanzas
register_stanza_plugin(Presence, MUCPresence)
self.xmpp.register_handler(Callback('MUCPresence', MatchXMLMask("<presence xmlns='%s' />" % self.xmpp.default_ns), self.handle_groupchat_presence))
self.xmpp.register_handler(Callback('MUCError', MatchXMLMask("<message xmlns='%s' type='error'><error/></message>" % self.xmpp.default_ns), self.handle_groupchat_error_message))
self.xmpp.register_handler(Callback('MUCMessage', MatchXMLMask("<message xmlns='%s' type='groupchat'><body/></message>" % self.xmpp.default_ns), self.handle_groupchat_message))
self.xmpp.register_handler(Callback('MUCSubject', MatchXMLMask("<message xmlns='%s' type='groupchat'><subject/></message>" % self.xmpp.default_ns), self.handle_groupchat_subject))
self.xmpp.register_handler(Callback('MUCConfig', MatchXMLMask("<message xmlns='%s' type='groupchat'><x xmlns='http://jabber.org/protocol/muc#user'><status/></x></message>" % self.xmpp.default_ns), self.handle_config_change))
self.xmpp.register_handler(Callback('MUCInvite', MatchXPath("{%s}message/{%s}x/{%s}invite" % (
self.xmpp.default_ns,
'http://jabber.org/protocol/muc#user',
'http://jabber.org/protocol/muc#user')), self.handle_groupchat_invite))
def plugin_end(self):
self.xmpp.plugin['xep_0030'].del_feature(feature='http://jabber.org/protocol/muc')
def session_bind(self, jid):
self.xmpp.plugin['xep_0030'].add_feature('http://jabber.org/protocol/muc')
def handle_groupchat_invite(self, inv):
""" Handle an invite into a muc.
"""
logging.debug("MUC invite to %s from %s: %s", inv['to'], inv["from"], inv)
if inv['from'] not in self.rooms.keys():
self.xmpp.event("groupchat_invite", inv)
def handle_config_change(self, msg):
"""Handle a MUC configuration change (with status code)."""
self.xmpp.event('groupchat_config_status', msg)
self.xmpp.event('muc::%s::config_status' % msg['from'].bare , msg)
def handle_groupchat_presence(self, pr):
""" Handle a presence in a muc.
"""
got_offline = False
got_online = False
if pr['muc']['room'] not in self.rooms.keys():
return
self.xmpp.roster[pr['from']].ignore_updates = True
entry = pr['muc'].get_stanza_values()
entry['show'] = pr['show'] if pr['show'] in pr.showtypes else None
entry['status'] = pr['status']
entry['alt_nick'] = pr['nick']
if pr['type'] == 'unavailable':
if entry['nick'] in self.rooms[entry['room']]:
del self.rooms[entry['room']][entry['nick']]
got_offline = True
else:
if entry['nick'] not in self.rooms[entry['room']]:
got_online = True
self.rooms[entry['room']][entry['nick']] = entry
log.debug("MUC presence from %s/%s : %s", entry['room'],entry['nick'], entry)
self.xmpp.event("groupchat_presence", pr)
self.xmpp.event("muc::%s::presence" % entry['room'], pr)
if got_offline:
self.xmpp.event("muc::%s::got_offline" % entry['room'], pr)
if got_online:
self.xmpp.event("muc::%s::got_online" % entry['room'], pr)
def handle_groupchat_message(self, msg: Message) -> None:
""" Handle a message event in a muc.
"""
self.xmpp.event('groupchat_message', msg)
self.xmpp.event("muc::%s::message" % msg['from'].bare, msg)
def handle_groupchat_error_message(self, msg):
""" Handle a message error event in a muc.
"""
self.xmpp.event('groupchat_message_error', msg)
self.xmpp.event("muc::%s::message_error" % msg['from'].bare, msg)
def handle_groupchat_subject(self, msg: Message) -> None:
""" Handle a message coming from a muc indicating
a change of subject (or announcing it when joining the room)
"""
# See poezio#3452. A message containing subject _and_ (body or thread)
# is not a subject change.
if msg['body'] or msg['thread']:
return None
self.xmpp.event('groupchat_subject', msg)
def jid_in_room(self, room, jid):
for nick in self.rooms[room]:
entry = self.rooms[room][nick]
if entry is not None and entry['jid'].full == jid:
return True
return False
def get_nick(self, room, jid):
for nick in self.rooms[room]:
entry = self.rooms[room][nick]
if entry is not None and entry['jid'].full == jid:
return nick
def configure_room(self, room, form=None, ifrom=None):
if form is None:
form = self.get_room_config(room, ifrom=ifrom)
iq = self.xmpp.make_iq_set()
iq['to'] = room
if ifrom is not None:
iq['from'] = ifrom
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
form['type'] = 'submit'
query.append(form)
iq.append(query)
# For now, swallow errors to preserve existing API
try:
result = iq.send()
except IqError:
return False
except IqTimeout:
return False
return True
def join_muc(self, room, nick, maxhistory="0", password='', wait=False, pstatus=None, pshow=None, pfrom=None):
""" Join the specified room, requesting 'maxhistory' lines of history.
"""
stanza = self.xmpp.make_presence(pto="%s/%s" % (room, nick), pstatus=pstatus, pshow=pshow, pfrom=pfrom)
x = ET.Element('{http://jabber.org/protocol/muc}x')
if password:
passelement = ET.Element('{http://jabber.org/protocol/muc}password')
passelement.text = password
x.append(passelement)
if maxhistory:
history = ET.Element('{http://jabber.org/protocol/muc}history')
if maxhistory == "0":
history.attrib['maxchars'] = maxhistory
else:
history.attrib['maxstanzas'] = maxhistory
x.append(history)
stanza.append(x)
if not wait:
self.xmpp.send(stanza)
else:
#wait for our own room presence back
expect = ET.Element("{%s}presence" % self.xmpp.default_ns, {'from':"%s/%s" % (room, nick)})
self.xmpp.send(stanza, expect)
self.rooms[room] = {}
self.our_nicks[room] = nick
def destroy(self, room, reason='', altroom = '', ifrom=None):
iq = self.xmpp.make_iq_set()
if ifrom is not None:
iq['from'] = ifrom
iq['to'] = room
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
destroy = ET.Element('{http://jabber.org/protocol/muc#owner}destroy')
if altroom:
destroy.attrib['jid'] = altroom
xreason = ET.Element('{http://jabber.org/protocol/muc#owner}reason')
xreason.text = reason
destroy.append(xreason)
query.append(destroy)
iq.append(query)
# For now, swallow errors to preserve existing API
try:
r = iq.send()
except IqError:
return False
except IqTimeout:
return False
return True
def set_affiliation(self, room, jid=None, nick=None, affiliation='member', ifrom=None):
""" Change room affiliation."""
if affiliation not in ('outcast', 'member', 'admin', 'owner', 'none'):
raise TypeError
query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
if nick is not None:
item = ET.Element('{http://jabber.org/protocol/muc#admin}item', {'affiliation':affiliation, 'nick':nick})
else:
item = ET.Element('{http://jabber.org/protocol/muc#admin}item', {'affiliation':affiliation, 'jid':jid})
query.append(item)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
iq['from'] = ifrom
# For now, swallow errors to preserve existing API
try:
result = iq.send()
except IqError:
return False
except IqTimeout:
return False
return True
def set_role(self, room, nick, role):
""" Change role property of a nick in a room.
Typically, roles are temporary (they last only as long as you are in the
room), whereas affiliations are permanent (they last across groupchat
sessions).
"""
if role not in ('moderator', 'participant', 'visitor', 'none'):
raise TypeError
query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
item = ET.Element('item', {'role':role, 'nick':nick})
query.append(item)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
result = iq.send()
if result is False or result['type'] != 'result':
raise ValueError
return True
def invite(self, room, jid, reason='', mfrom=''):
""" Invite a jid to a room."""
msg = self.xmpp.make_message(room)
msg['from'] = mfrom
x = ET.Element('{http://jabber.org/protocol/muc#user}x')
invite = ET.Element('{http://jabber.org/protocol/muc#user}invite', {'to': jid})
if reason:
rxml = ET.Element('{http://jabber.org/protocol/muc#user}reason')
rxml.text = reason
invite.append(rxml)
x.append(invite)
msg.append(x)
self.xmpp.send(msg)
def leave_muc(self, room, nick, msg='', pfrom=None):
""" Leave the specified room.
"""
if msg:
self.xmpp.send_presence(pshow='unavailable', pto="%s/%s" % (room, nick), pstatus=msg, pfrom=pfrom)
else:
self.xmpp.send_presence(pshow='unavailable', pto="%s/%s" % (room, nick), pfrom=pfrom)
del self.rooms[room]
def get_room_config(self, room, ifrom=''):
iq = self.xmpp.make_iq_get('http://jabber.org/protocol/muc#owner')
iq['to'] = room
iq['from'] = ifrom
# For now, swallow errors to preserve existing API
try:
result = iq.send()
except IqError:
raise ValueError
except IqTimeout:
raise ValueError
form = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
if form is None:
raise ValueError
return self.xmpp.plugin['xep_0004'].build_form(form)
def cancel_config(self, room, ifrom=None):
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
x = ET.Element('{jabber:x:data}x', type='cancel')
query.append(x)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
iq['from'] = ifrom
iq.send()
def set_room_config(self, room, config, ifrom=''):
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
config['type'] = 'submit'
query.append(config)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
iq['from'] = ifrom
iq.send()
def get_joined_rooms(self):
return self.rooms.keys()
def get_our_jid_in_room(self, room_jid):
""" Return the jid we're using in a room.
"""
return "%s/%s" % (room_jid, self.our_nicks[room_jid])
def get_jid_property(self, room, nick, jid_property):
""" Get the property of a nick in a room, such as its 'jid' or 'affiliation'
If not found, return None.
"""
if room in self.rooms and nick in self.rooms[room] and jid_property in self.rooms[room][nick]:
return self.rooms[room][nick][jid_property]
else:
return None
def get_roster(self, room):
""" Get the list of nicks in a room.
"""
if room not in self.rooms.keys():
return None
return self.rooms[room].keys()
def get_users_by_affiliation(cls, room, affiliation='member', ifrom=None):
if affiliation not in ('outcast', 'member', 'admin', 'owner', 'none'):
raise TypeError
query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
item = ET.Element('{http://jabber.org/protocol/muc#admin}item', {'affiliation': affiliation})
query.append(item)
iq = cls.xmpp.Iq(sto=room, sfrom=ifrom, stype='get')
iq.append(query)
return iq.send()
register_plugin(XEP_0045)

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@ -0,0 +1,336 @@
"""
Slixmpp: The Slick XMPP Library
Copyright (C) 2010 Nathanael C. Fritz
Copyright (C) 2020 "Maxime “pep” Buquet <pep@bouah.net>"
This file is part of Slixmpp.
See the file LICENSE for copying permission.
"""
from __future__ import with_statement
import logging
from slixmpp import Presence, Message
from slixmpp.plugins import BasePlugin
from slixmpp.xmlstream import register_stanza_plugin, ET
from slixmpp.xmlstream.handler.callback import Callback
from slixmpp.xmlstream.matcher.xpath import MatchXPath
from slixmpp.xmlstream.matcher.xmlmask import MatchXMLMask
from slixmpp.exceptions import IqError, IqTimeout
from slixmpp.plugins.xep_0045 import stanza
from slixmpp.plugins.xep_0045.stanza import MUCPresence
log = logging.getLogger(__name__)
class XEP_0045(BasePlugin):
"""
Implements XEP-0045 Multi-User Chat
"""
name = 'xep_0045'
description = 'XEP-0045: Multi-User Chat'
dependencies = {'xep_0030', 'xep_0004'}
stanza = stanza
def plugin_init(self):
self.rooms = {}
self.our_nicks = {}
self.xep = '0045'
# load MUC support in presence stanzas
register_stanza_plugin(Presence, MUCPresence)
self.xmpp.register_handler(Callback('MUCPresence', MatchXMLMask("<presence xmlns='%s' />" % self.xmpp.default_ns), self.handle_groupchat_presence))
self.xmpp.register_handler(Callback('MUCError', MatchXMLMask("<message xmlns='%s' type='error'><error/></message>" % self.xmpp.default_ns), self.handle_groupchat_error_message))
self.xmpp.register_handler(Callback('MUCMessage', MatchXMLMask("<message xmlns='%s' type='groupchat'><body/></message>" % self.xmpp.default_ns), self.handle_groupchat_message))
self.xmpp.register_handler(Callback('MUCSubject', MatchXMLMask("<message xmlns='%s' type='groupchat'><subject/></message>" % self.xmpp.default_ns), self.handle_groupchat_subject))
self.xmpp.register_handler(Callback('MUCConfig', MatchXMLMask("<message xmlns='%s' type='groupchat'><x xmlns='http://jabber.org/protocol/muc#user'><status/></x></message>" % self.xmpp.default_ns), self.handle_config_change))
self.xmpp.register_handler(Callback('MUCInvite', MatchXPath("{%s}message/{%s}x/{%s}invite" % (
self.xmpp.default_ns,
stanza.NS_USER,
stanza.NS_USER)), self.handle_groupchat_invite))
def plugin_end(self):
self.xmpp.plugin['xep_0030'].del_feature(feature=stanza.NS)
def session_bind(self, jid):
self.xmpp.plugin['xep_0030'].add_feature(stanza.NS)
def handle_groupchat_invite(self, inv):
""" Handle an invite into a muc.
"""
logging.debug("MUC invite to %s from %s: %s", inv['to'], inv["from"], inv)
if inv['from'] not in self.rooms.keys():
self.xmpp.event("groupchat_invite", inv)
def handle_config_change(self, msg):
"""Handle a MUC configuration change (with status code)."""
self.xmpp.event('groupchat_config_status', msg)
self.xmpp.event('muc::%s::config_status' % msg['from'].bare , msg)
def handle_groupchat_presence(self, pr):
""" Handle a presence in a muc.
"""
got_offline = False
got_online = False
if pr['muc']['room'] not in self.rooms.keys():
return
self.xmpp.roster[pr['from']].ignore_updates = True
entry = pr['muc'].get_stanza_values()
entry['show'] = pr['show'] if pr['show'] in pr.showtypes else None
entry['status'] = pr['status']
entry['alt_nick'] = pr['nick']
if pr['type'] == 'unavailable':
if entry['nick'] in self.rooms[entry['room']]:
del self.rooms[entry['room']][entry['nick']]
got_offline = True
else:
if entry['nick'] not in self.rooms[entry['room']]:
got_online = True
self.rooms[entry['room']][entry['nick']] = entry
log.debug("MUC presence from %s/%s : %s", entry['room'],entry['nick'], entry)
self.xmpp.event("groupchat_presence", pr)
self.xmpp.event("muc::%s::presence" % entry['room'], pr)
if got_offline:
self.xmpp.event("muc::%s::got_offline" % entry['room'], pr)
if got_online:
self.xmpp.event("muc::%s::got_online" % entry['room'], pr)
def handle_groupchat_message(self, msg: Message) -> None:
""" Handle a message event in a muc.
"""
self.xmpp.event('groupchat_message', msg)
self.xmpp.event("muc::%s::message" % msg['from'].bare, msg)
def handle_groupchat_error_message(self, msg):
""" Handle a message error event in a muc.
"""
self.xmpp.event('groupchat_message_error', msg)
self.xmpp.event("muc::%s::message_error" % msg['from'].bare, msg)
def handle_groupchat_subject(self, msg: Message) -> None:
""" Handle a message coming from a muc indicating
a change of subject (or announcing it when joining the room)
"""
# See poezio#3452. A message containing subject _and_ (body or thread)
# is not a subject change.
if msg['body'] or msg['thread']:
return None
self.xmpp.event('groupchat_subject', msg)
def jid_in_room(self, room, jid):
for nick in self.rooms[room]:
entry = self.rooms[room][nick]
if entry is not None and entry['jid'].full == jid:
return True
return False
def get_nick(self, room, jid):
for nick in self.rooms[room]:
entry = self.rooms[room][nick]
if entry is not None and entry['jid'].full == jid:
return nick
def configure_room(self, room, form=None, ifrom=None):
if form is None:
form = self.get_room_config(room, ifrom=ifrom)
iq = self.xmpp.make_iq_set()
iq['to'] = room
if ifrom is not None:
iq['from'] = ifrom
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
form['type'] = 'submit'
query.append(form)
iq.append(query)
# For now, swallow errors to preserve existing API
try:
result = iq.send()
except IqError:
return False
except IqTimeout:
return False
return True
def join_muc(self, room, nick, maxhistory="0", password='', wait=False, pstatus=None, pshow=None, pfrom=None):
""" Join the specified room, requesting 'maxhistory' lines of history.
"""
stanza = self.xmpp.make_presence(pto="%s/%s" % (room, nick), pstatus=pstatus, pshow=pshow, pfrom=pfrom)
x = ET.Element('{http://jabber.org/protocol/muc}x')
if password:
passelement = ET.Element('{http://jabber.org/protocol/muc}password')
passelement.text = password
x.append(passelement)
if maxhistory:
history = ET.Element('{http://jabber.org/protocol/muc}history')
if maxhistory == "0":
history.attrib['maxchars'] = maxhistory
else:
history.attrib['maxstanzas'] = maxhistory
x.append(history)
stanza.append(x)
if not wait:
self.xmpp.send(stanza)
else:
#wait for our own room presence back
expect = ET.Element("{%s}presence" % self.xmpp.default_ns, {'from':"%s/%s" % (room, nick)})
self.xmpp.send(stanza, expect)
self.rooms[room] = {}
self.our_nicks[room] = nick
def destroy(self, room, reason='', altroom = '', ifrom=None):
iq = self.xmpp.make_iq_set()
if ifrom is not None:
iq['from'] = ifrom
iq['to'] = room
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
destroy = ET.Element('{http://jabber.org/protocol/muc#owner}destroy')
if altroom:
destroy.attrib['jid'] = altroom
xreason = ET.Element('{http://jabber.org/protocol/muc#owner}reason')
xreason.text = reason
destroy.append(xreason)
query.append(destroy)
iq.append(query)
# For now, swallow errors to preserve existing API
try:
r = iq.send()
except IqError:
return False
except IqTimeout:
return False
return True
def set_affiliation(self, room, jid=None, nick=None, affiliation='member', ifrom=None):
""" Change room affiliation."""
if affiliation not in ('outcast', 'member', 'admin', 'owner', 'none'):
raise TypeError
query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
if nick is not None:
item = ET.Element('{http://jabber.org/protocol/muc#admin}item', {'affiliation':affiliation, 'nick':nick})
else:
item = ET.Element('{http://jabber.org/protocol/muc#admin}item', {'affiliation':affiliation, 'jid':jid})
query.append(item)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
iq['from'] = ifrom
# For now, swallow errors to preserve existing API
try:
result = iq.send()
except IqError:
return False
except IqTimeout:
return False
return True
def set_role(self, room, nick, role):
""" Change role property of a nick in a room.
Typically, roles are temporary (they last only as long as you are in the
room), whereas affiliations are permanent (they last across groupchat
sessions).
"""
if role not in ('moderator', 'participant', 'visitor', 'none'):
raise TypeError
query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
item = ET.Element('item', {'role':role, 'nick':nick})
query.append(item)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
result = iq.send()
if result is False or result['type'] != 'result':
raise ValueError
return True
def invite(self, room, jid, reason='', mfrom=''):
""" Invite a jid to a room."""
msg = self.xmpp.make_message(room)
msg['from'] = mfrom
x = ET.Element('{http://jabber.org/protocol/muc#user}x')
invite = ET.Element('{http://jabber.org/protocol/muc#user}invite', {'to': jid})
if reason:
rxml = ET.Element('{http://jabber.org/protocol/muc#user}reason')
rxml.text = reason
invite.append(rxml)
x.append(invite)
msg.append(x)
self.xmpp.send(msg)
def leave_muc(self, room, nick, msg='', pfrom=None):
""" Leave the specified room.
"""
if msg:
self.xmpp.send_presence(pshow='unavailable', pto="%s/%s" % (room, nick), pstatus=msg, pfrom=pfrom)
else:
self.xmpp.send_presence(pshow='unavailable', pto="%s/%s" % (room, nick), pfrom=pfrom)
del self.rooms[room]
def get_room_config(self, room, ifrom=''):
iq = self.xmpp.make_iq_get('http://jabber.org/protocol/muc#owner')
iq['to'] = room
iq['from'] = ifrom
# For now, swallow errors to preserve existing API
try:
result = iq.send()
except IqError:
raise ValueError
except IqTimeout:
raise ValueError
form = result.xml.find('{http://jabber.org/protocol/muc#owner}query/{jabber:x:data}x')
if form is None:
raise ValueError
return self.xmpp.plugin['xep_0004'].build_form(form)
def cancel_config(self, room, ifrom=None):
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
x = ET.Element('{jabber:x:data}x', type='cancel')
query.append(x)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
iq['from'] = ifrom
iq.send()
def set_room_config(self, room, config, ifrom=''):
query = ET.Element('{http://jabber.org/protocol/muc#owner}query')
config['type'] = 'submit'
query.append(config)
iq = self.xmpp.make_iq_set(query)
iq['to'] = room
iq['from'] = ifrom
iq.send()
def get_joined_rooms(self):
return self.rooms.keys()
def get_our_jid_in_room(self, room_jid):
""" Return the jid we're using in a room.
"""
return "%s/%s" % (room_jid, self.our_nicks[room_jid])
def get_jid_property(self, room, nick, jid_property):
""" Get the property of a nick in a room, such as its 'jid' or 'affiliation'
If not found, return None.
"""
if room in self.rooms and nick in self.rooms[room] and jid_property in self.rooms[room][nick]:
return self.rooms[room][nick][jid_property]
else:
return None
def get_roster(self, room):
""" Get the list of nicks in a room.
"""
if room not in self.rooms.keys():
return None
return self.rooms[room].keys()
def get_users_by_affiliation(cls, room, affiliation='member', ifrom=None):
if affiliation not in ('outcast', 'member', 'admin', 'owner', 'none'):
raise TypeError
query = ET.Element('{http://jabber.org/protocol/muc#admin}query')
item = ET.Element('{http://jabber.org/protocol/muc#admin}item', {'affiliation': affiliation})
query.append(item)
iq = cls.xmpp.Iq(sto=room, sfrom=ifrom, stype='get')
iq.append(query)
return iq.send()