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Merge branch 'room_config' into develop

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This commit is contained in:
Erik Johnston 2014-09-01 20:28:11 +01:00
commit a85612baf8
12 changed files with 579 additions and 48 deletions
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139
synapse/api/auth.py
View File

@ -17,9 +17,10 @@
from twisted.internet import defer
from synapse.api.constants import Membership
from synapse.api.constants import Membership, JoinRules
from synapse.api.errors import AuthError, StoreError, Codes
from synapse.api.events.room import RoomMemberEvent
from synapse.util.logutils import log_function
import logging
@ -44,15 +45,28 @@ class Auth(object):
"""
try:
if hasattr(event, "room_id"):
is_state = hasattr(event, "state_key")
if event.type == RoomMemberEvent.TYPE:
yield self._can_replace_state(event)
allowed = yield self.is_membership_change_allowed(event)
defer.returnValue(allowed)
else:
return
self._check_joined_room(
member=snapshot.membership_state,
user_id=snapshot.user_id,
room_id=snapshot.room_id,
)
if is_state:
# TODO (erikj): This really only should be called for *new*
# state
yield self._can_add_state(event)
yield self._can_replace_state(event)
else:
yield self._can_send_event(event)
defer.returnValue(True)
else:
raise AuthError(500, "Unknown event: %s" % event)
@ -111,7 +125,14 @@ class Auth(object):
membership = event.content["membership"]
join_rule = yield self.store.get_room_join_rule(event.room_id)
if not join_rule:
join_rule = JoinRules.INVITE
if Membership.INVITE == membership:
# TODO (erikj): We should probably handle this more intelligently
# PRIVATE join rules.
# Invites are valid iff caller is in the room and target isn't.
if not caller_in_room: # caller isn't joined
raise AuthError(403, "You are not in room %s." % event.room_id)
@ -124,18 +145,42 @@ class Auth(object):
# joined: It's a NOOP
if event.user_id != target_user_id:
raise AuthError(403, "Cannot force another user to join.")
elif room.is_public:
pass # anyone can join public rooms.
elif (not caller or caller.membership not in
[Membership.INVITE, Membership.JOIN]):
elif join_rule == JoinRules.PUBLIC or room.is_public:
pass
elif join_rule == JoinRules.INVITE:
if (
not caller or caller.membership not in
[Membership.INVITE, Membership.JOIN]
):
raise AuthError(403, "You are not invited to this room.")
else:
# TODO (erikj): may_join list
# TODO (erikj): private rooms
raise AuthError(403, "You are not allowed to join this room")
elif Membership.LEAVE == membership:
# TODO (erikj): Implement kicks.
if not caller_in_room: # trying to leave a room you aren't joined
raise AuthError(403, "You are not in room %s." % event.room_id)
elif target_user_id != event.user_id:
# trying to force another user to leave
raise AuthError(403, "Cannot force %s to leave." %
target_user_id)
elif Membership.BAN == membership:
user_level = yield self.store.get_power_level(
event.room_id,
event.user_id,
)
ban_level, _ = yield self.store.get_ops_levels(event.room_id)
if ban_level:
ban_level = int(ban_level)
else:
ban_level = 5 # FIXME (erikj): What should we do here?
if user_level < ban_level:
raise AuthError(403, "You don't have permission to ban")
else:
raise AuthError(500, "Unknown membership %s" % membership)
@ -176,3 +221,85 @@ class Auth(object):
except StoreError:
raise AuthError(403, "Unrecognised access token.",
errcode=Codes.UNKNOWN_TOKEN)
@defer.inlineCallbacks
@log_function
def _can_send_event(self, event):
send_level = yield self.store.get_send_event_level(event.room_id)
if send_level:
send_level = int(send_level)
else:
send_level = 0
user_level = yield self.store.get_power_level(
event.room_id,
event.user_id,
)
if user_level:
user_level = int(user_level)
else:
user_level = 0
if user_level < send_level:
raise AuthError(
403, "You don't have permission to post to the room"
)
defer.returnValue(True)
@defer.inlineCallbacks
def _can_add_state(self, event):
add_level = yield self.store.get_add_state_level(event.room_id)
if not add_level:
defer.returnValue(True)
add_level = int(add_level)
user_level = yield self.store.get_power_level(
event.room_id,
event.user_id,
)
user_level = int(user_level)
if user_level < add_level:
raise AuthError(
403, "You don't have permission to add state to the room"
)
defer.returnValue(True)
@defer.inlineCallbacks
def _can_replace_state(self, event):
current_state = yield self.store.get_current_state(
event.room_id,
event.type,
event.state_key,
)
if current_state:
current_state = current_state[0]
user_level = yield self.store.get_power_level(
event.room_id,
event.user_id,
)
if user_level:
user_level = int(user_level)
else:
user_level = 0
logger.debug("Checking power level for %s, %s", event.user_id, user_level)
if current_state and hasattr(current_state, "required_power_level"):
req = current_state.required_power_level
logger.debug("Checked power level for %s, %s", event.user_id, req)
if user_level < req:
raise AuthError(
403,
"You don't have permission to change that state"
)

10
synapse/api/constants.py
View File

@ -23,7 +23,8 @@ class Membership(object):
JOIN = u"join"
KNOCK = u"knock"
LEAVE = u"leave"
LIST = (INVITE, JOIN, KNOCK, LEAVE)
BAN = u"ban"
LIST = (INVITE, JOIN, KNOCK, LEAVE, BAN)
class Feedback(object):
@ -42,3 +43,10 @@ class PresenceState(object):
UNAVAILABLE = u"unavailable"
ONLINE = u"online"
FREE_FOR_CHAT = u"free_for_chat"
class JoinRules(object):
PUBLIC = u"public"
KNOCK = u"knock"
INVITE = u"invite"
PRIVATE = u"private"

9
synapse/api/events/__init__.py
View File

@ -42,6 +42,7 @@ class SynapseEvent(JsonEncodedObject):
"user_id", # sender/initiator
"content", # HTTP body, JSON
"state_key",
"required_power_level",
]
internal_keys = [
@ -52,6 +53,7 @@ class SynapseEvent(JsonEncodedObject):
"destinations",
"origin",
"outlier",
"power_level",
]
required_keys = [
@ -152,3 +154,10 @@ class SynapseEvent(JsonEncodedObject):
msg = self._check_json(entry, template[key][0])
if msg:
return msg
class SynapseStateEvent(SynapseEvent):
def __init__(self, **kwargs):
if "state_key" not in kwargs:
kwargs["state_key"] = ""
super(SynapseStateEvent, self).__init__(**kwargs)

10
synapse/api/events/factory.py
View File

@ -16,6 +16,8 @@
from synapse.api.events.room import (
RoomTopicEvent, MessageEvent, RoomMemberEvent, FeedbackEvent,
InviteJoinEvent, RoomConfigEvent, RoomNameEvent, GenericEvent,
RoomPowerLevelsEvent, RoomJoinRulesEvent, RoomOpsPowerLevelsEvent,
RoomCreateEvent, RoomAddStateLevelEvent, RoomSendEventLevelEvent
)
from synapse.util.stringutils import random_string
@ -30,7 +32,13 @@ class EventFactory(object):
RoomMemberEvent,
FeedbackEvent,
InviteJoinEvent,
RoomConfigEvent
RoomConfigEvent,
RoomPowerLevelsEvent,
RoomJoinRulesEvent,
RoomCreateEvent,
RoomAddStateLevelEvent,
RoomSendEventLevelEvent,
RoomOpsPowerLevelsEvent,
]
def __init__(self, hs):

44
synapse/api/events/room.py
View File

@ -15,7 +15,7 @@
from synapse.api.constants import Feedback, Membership
from synapse.api.errors import SynapseError
from . import SynapseEvent
from . import SynapseEvent, SynapseStateEvent
class GenericEvent(SynapseEvent):
@ -132,3 +132,45 @@ class RoomConfigEvent(SynapseEvent):
def get_content_template(self):
return {}
class RoomCreateEvent(SynapseStateEvent):
TYPE = "m.room.create"
def get_content_template(self):
return {}
class RoomJoinRulesEvent(SynapseStateEvent):
TYPE = "m.room.join_rules"
def get_content_template(self):
return {}
class RoomPowerLevelsEvent(SynapseStateEvent):
TYPE = "m.room.power_levels"
def get_content_template(self):
return {}
class RoomAddStateLevelEvent(SynapseStateEvent):
TYPE = "m.room.add_state_level"
def get_content_template(self):
return {}
class RoomSendEventLevelEvent(SynapseStateEvent):
TYPE = "m.room.send_event_level"
def get_content_template(self):
return {}
class RoomOpsPowerLevelsEvent(SynapseStateEvent):
TYPE = "m.room.ops_levels"
def get_content_template(self):
return {}

1
synapse/federation/units.py
View File

@ -68,6 +68,7 @@ class Pdu(JsonEncodedObject):
"power_level",
"prev_state_id",
"prev_state_origin",
"required_power_level",
]
internal_keys = [

111
synapse/handlers/room.py
View File

@ -17,10 +17,12 @@
from twisted.internet import defer
from synapse.types import UserID, RoomAlias, RoomID
from synapse.api.constants import Membership
from synapse.api.constants import Membership, JoinRules
from synapse.api.errors import StoreError, SynapseError
from synapse.api.events.room import (
RoomMemberEvent, RoomConfigEvent
RoomMemberEvent, RoomCreateEvent, RoomPowerLevelsEvent,
RoomJoinRulesEvent, RoomAddStateLevelEvent,
RoomSendEventLevelEvent, RoomOpsPowerLevelsEvent,
)
from synapse.util import stringutils
from ._base import BaseRoomHandler
@ -62,6 +64,8 @@ class RoomCreationHandler(BaseRoomHandler):
else:
room_alias = None
is_public = config.get("visibility", None) == "public"
if room_id:
# Ensure room_id is the correct type
room_id_obj = RoomID.from_string(room_id, self.hs)
@ -71,7 +75,7 @@ class RoomCreationHandler(BaseRoomHandler):
yield self.store.store_room(
room_id=room_id,
room_creator_user_id=user_id,
is_public=config["visibility"] == "public"
is_public=is_public
)
else:
# autogen room IDs and try to create it. We may clash, so just
@ -85,7 +89,7 @@ class RoomCreationHandler(BaseRoomHandler):
yield self.store.store_room(
room_id=gen_room_id.to_string(),
room_creator_user_id=user_id,
is_public=config["visibility"] == "public"
is_public=is_public
)
room_id = gen_room_id.to_string()
break
@ -94,18 +98,10 @@ class RoomCreationHandler(BaseRoomHandler):
if not room_id:
raise StoreError(500, "Couldn't generate a room ID.")
config_event = self.event_factory.create_event(
etype=RoomConfigEvent.TYPE,
room_id=room_id,
user_id=user_id,
content=config,
)
snapshot = yield self.store.snapshot_room(
room_id=room_id,
user_id=user_id,
state_type=RoomConfigEvent.TYPE,
state_key="",
user = self.hs.parse_userid(user_id)
creation_events = self._create_events_for_new_room(
user, room_id, is_public=is_public
)
if room_alias:
@ -115,11 +111,18 @@ class RoomCreationHandler(BaseRoomHandler):
servers=[self.hs.hostname],
)
yield self.state_handler.handle_new_event(config_event, snapshot)
# store_id = persist...
federation_handler = self.hs.get_handlers().federation_handler
yield federation_handler.handle_new_event(config_event, snapshot)
for event in creation_events:
snapshot = yield self.store.snapshot_room(
room_id=room_id,
user_id=user_id,
)
logger.debug("Event: %s", event)
yield self.state_handler.handle_new_event(event, snapshot)
yield self._on_new_room_event(event, snapshot, extra_users=[user])
content = {"membership": Membership.JOIN}
join_event = self.event_factory.create_event(
@ -142,6 +145,63 @@ class RoomCreationHandler(BaseRoomHandler):
defer.returnValue(result)
def _create_events_for_new_room(self, creator, room_id, is_public=False):
event_keys = {
"room_id": room_id,
"user_id": creator.to_string(),
"required_power_level": 10,
}
def create(etype, **content):
return self.event_factory.create_event(
etype=etype,
content=content,
**event_keys
)
creation_event = create(
etype=RoomCreateEvent.TYPE,
creator=creator.to_string(),
default=0,
)
power_levels_event = self.event_factory.create_event(
etype=RoomPowerLevelsEvent.TYPE,
content={creator.to_string(): 10, "default": 0},
**event_keys
)
join_rule = JoinRules.PUBLIC if is_public else JoinRules.INVITE
join_rules_event = create(
etype=RoomJoinRulesEvent.TYPE,
join_rule=join_rule,
)
add_state_event = create(
etype=RoomAddStateLevelEvent.TYPE,
level=10,
)
send_event = create(
etype=RoomSendEventLevelEvent.TYPE,
level=0,
)
ops = create(
etype=RoomOpsPowerLevelsEvent.TYPE,
ban_level=5,
kick_level=5,
)
return [
creation_event,
power_levels_event,
join_rules_event,
add_state_event,
send_event,
ops,
]
class RoomMemberHandler(BaseRoomHandler):
# TODO(paul): This handler currently contains a messy conflation of
@ -285,6 +345,16 @@ class RoomMemberHandler(BaseRoomHandler):
if do_auth:
yield self.auth.check(event, snapshot, raises=True)
# If we're banning someone, set a req power level
if event.membership == Membership.BAN:
if not hasattr(event, "required_power_level") or event.required_power_level is None:
# Add some default required_power_level
user_level = yield self.store.get_power_level(
event.room_id,
event.user_id,
)
event.required_power_level = user_level
if prev_state and prev_state.membership == event.membership:
# double same action, treat this event as a NOOP.
defer.returnValue({})
@ -445,8 +515,7 @@ class RoomMemberHandler(BaseRoomHandler):
host = target_user.domain
destinations.append(host)
# If we are joining a remote HS, include that.
if membership == Membership.JOIN:
# Always include target domain
host = target_user.domain
destinations.append(host)

15
synapse/storage/__init__.py
View File

@ -19,6 +19,10 @@ from synapse.api.events.room import (
RoomMemberEvent, RoomTopicEvent, FeedbackEvent,
# RoomConfigEvent,
RoomNameEvent,
RoomJoinRulesEvent,
RoomPowerLevelsEvent,
RoomAddStateLevelEvent,
RoomSendEventLevelEvent,
)
from synapse.util.logutils import log_function
@ -124,12 +128,18 @@ class DataStore(RoomMemberStore, RoomStore,
self._store_room_member_txn(txn, event)
elif event.type == FeedbackEvent.TYPE:
self._store_feedback_txn(txn, event)
# elif event.type == RoomConfigEvent.TYPE:
# self._store_room_config_txn(txn, event)
elif event.type == RoomNameEvent.TYPE:
self._store_room_name_txn(txn, event)
elif event.type == RoomTopicEvent.TYPE:
self._store_room_topic_txn(txn, event)
elif event.type == RoomJoinRulesEvent.TYPE:
self._store_join_rule(txn, event)
elif event.type == RoomPowerLevelsEvent.TYPE:
self._store_power_levels(txn, event)
elif event.type == RoomAddStateLevelEvent.TYPE:
self._store_add_state_level(txn, event)
elif event.type == RoomSendEventLevelEvent.TYPE:
self._store_send_event_level(txn, event)
vals = {
"topological_ordering": event.depth,
@ -223,7 +233,6 @@ class DataStore(RoomMemberStore, RoomStore,
defer.returnValue(self.min_token)
def snapshot_room(self, room_id, user_id, state_type=None, state_key=None):
"""Snapshot the room for an update by a user
Args:

181
synapse/storage/room.py
View File

@ -27,6 +27,9 @@ import logging
logger = logging.getLogger(__name__)
OpsLevel = collections.namedtuple("OpsLevel", ("ban_level", "kick_level"))
class RoomStore(SQLBaseStore):
@defer.inlineCallbacks
@ -129,6 +132,98 @@ class RoomStore(SQLBaseStore):
defer.returnValue(ret)
@defer.inlineCallbacks
def get_room_join_rule(self, room_id):
sql = (
"SELECT join_rule FROM room_join_rules as r "
"INNER JOIN current_state_events as c "
"ON r.event_id = c.event_id "
"WHERE c.room_id = ? "
)
rows = yield self._execute(None, sql, room_id)
if len(rows) == 1:
defer.returnValue(rows[0][0])
else:
defer.returnValue(None)
def get_power_level(self, room_id, user_id):
return self._db_pool.runInteraction(
self._get_power_level,
room_id, user_id,
)
def _get_power_level(self, txn, room_id, user_id):
sql = (
"SELECT level FROM room_power_levels as r "
"INNER JOIN current_state_events as c "
"ON r.event_id = c.event_id "
"WHERE c.room_id = ? AND r.user_id = ? "
)
rows = txn.execute(sql, (room_id, user_id,)).fetchall()
if len(rows) == 1:
return rows[0][0]
sql = (
"SELECT level FROM room_default_levels as r "
"INNER JOIN current_state_events as c "
"ON r.event_id = c.event_id "
"WHERE c.room_id = ? "
)
rows = txn.execute(sql, (room_id,)).fetchall()
if len(rows) == 1:
return rows[0][0]
else:
return None
def get_ops_levels(self, room_id):
return self._db_pool.runInteraction(
self._get_ops_levels,
room_id,
)
def _get_ops_levels(self, txn, room_id):
sql = (
"SELECT ban_level, kick_level FROM room_ops_levels as r "
"INNER JOIN current_state_events as c "
"ON r.event_id = c.event_id "
"WHERE c.room_id = ? "
)
rows = txn.execute(sql, (room_id,)).fetchall()
if len(rows) == 1:
return OpsLevel(rows[0][0], rows[0][1])
else:
return OpsLevel(None, None)
def get_add_state_level(self, room_id):
return self._get_level_from_table("room_add_state_levels", room_id)
def get_send_event_level(self, room_id):
return self._get_level_from_table("room_send_event_levels", room_id)
@defer.inlineCallbacks
def _get_level_from_table(self, table, room_id):
sql = (
"SELECT level FROM %(table)s as r "
"INNER JOIN current_state_events as c "
"ON r.event_id = c.event_id "
"WHERE c.room_id = ? "
) % {"table": table}
rows = yield self._execute(None, sql, room_id)
if len(rows) == 1:
defer.returnValue(rows[0][0])
else:
defer.returnValue(None)
def _store_room_topic_txn(self, txn, event):
self._simple_insert_txn(
txn,
@ -151,6 +246,92 @@ class RoomStore(SQLBaseStore):
}
)
def _store_join_rule(self, txn, event):
self._simple_insert_txn(
txn,
"room_join_rules",
{
"event_id": event.event_id,
"room_id": event.room_id,
"join_rule": event.content["join_rule"],
},
)
def _store_power_levels(self, txn, event):
for user_id, level in event.content.items():
if user_id == "default":
self._simple_insert_txn(
txn,
"room_default_levels",
{
"event_id": event.event_id,
"room_id": event.room_id,
"level": level,
},
)
else:
self._simple_insert_txn(
txn,
"room_power_levels",
{
"event_id": event.event_id,
"room_id": event.room_id,
"user_id": user_id,
"level": level
},
)
def _store_default_level(self, txn, event):
self._simple_insert_txn(
txn,
"room_default_levels",
{
"event_id": event.event_id,
"room_id": event.room_id,
"level": event.content["default_level"],
},
)
def _store_add_state_level(self, txn, event):
self._simple_insert_txn(
txn,
"room_add_state_levels",
{
"event_id": event.event_id,
"room_id": event.room_id,
"level": event.content["level"],
},
)
def _store_send_event_level(self, txn, event):
self._simple_insert_txn(
txn,
"room_send_event_levels",
{
"event_id": event.event_id,
"room_id": event.room_id,
"level": event.content["level"],
},
)
def _store_ops_level(self, txn, event):
content = {
"event_id": event.event_id,
"room_id": event.room_id,
}
if "kick_level" in event.content:
content["kick_level"] = event.content["kick_level"]
if "ban_level" in event.content:
content["ban_level"] = event.content["ban_level"]
self._simple_insert_txn(
txn,
"room_send_event_levels",
content,
)
class RoomsTable(Table):
table_name = "rooms"

63
synapse/storage/schema/im.sql
View File

@ -96,8 +96,71 @@ CREATE TABLE IF NOT EXISTS rooms(
creator TEXT
);
CREATE TABLE IF NOT EXISTS room_join_rules(
event_id TEXT NOT NULL,
room_id TEXT NOT NULL,
join_rule TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS room_join_rules_event_id ON room_join_rules(event_id);
CREATE INDEX IF NOT EXISTS room_join_rules_room_id ON room_join_rules(room_id);
CREATE TABLE IF NOT EXISTS room_power_levels(
event_id TEXT NOT NULL,
room_id TEXT NOT NULL,
user_id TEXT NOT NULL,
level INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS room_power_levels_event_id ON room_power_levels(event_id);
CREATE INDEX IF NOT EXISTS room_power_levels_room_id ON room_power_levels(room_id);
CREATE INDEX IF NOT EXISTS room_power_levels_room_user ON room_power_levels(room_id, user_id);
CREATE TABLE IF NOT EXISTS room_default_levels(
event_id TEXT NOT NULL,
room_id TEXT NOT NULL,
level INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS room_default_levels_event_id ON room_default_levels(event_id);
CREATE INDEX IF NOT EXISTS room_default_levels_room_id ON room_default_levels(room_id);
CREATE TABLE IF NOT EXISTS room_add_state_levels(
event_id TEXT NOT NULL,
room_id TEXT NOT NULL,
level INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS room_add_state_levels_event_id ON room_add_state_levels(event_id);
CREATE INDEX IF NOT EXISTS room_add_state_levels_room_id ON room_add_state_levels(room_id);
CREATE TABLE IF NOT EXISTS room_send_event_levels(
event_id TEXT NOT NULL,
room_id TEXT NOT NULL,
level INTEGER NOT NULL
);
CREATE INDEX IF NOT EXISTS room_send_event_levels_event_id ON room_send_event_levels(event_id);
CREATE INDEX IF NOT EXISTS room_send_event_levels_room_id ON room_send_event_levels(room_id);
CREATE TABLE IF NOT EXISTS room_ops_levels(
event_id TEXT NOT NULL,
room_id TEXT NOT NULL,
ban_level INTEGER,
kick_level INTEGER
);
CREATE INDEX IF NOT EXISTS room_ops_levels_event_id ON room_ops_levels(event_id);
CREATE INDEX IF NOT EXISTS room_ops_levels_room_id ON room_ops_levels(room_id);
CREATE TABLE IF NOT EXISTS room_hosts(
room_id TEXT NOT NULL,
host TEXT NOT NULL,
CONSTRAINT room_hosts_uniq UNIQUE (room_id, host) ON CONFLICT IGNORE
);
CREATE INDEX IF NOT EXISTS room_hosts_room_id ON room_hosts (room_id);

12
tests/handlers/test_room.py
View File

@ -330,6 +330,8 @@ class RoomCreationTest(unittest.TestCase):
datastore=NonCallableMock(spec_set=[
"store_room",
"snapshot_room",
"persist_event",
"get_joined_hosts_for_room",
]),
http_client=NonCallableMock(spec_set=[]),
notifier=NonCallableMock(spec_set=["on_new_room_event"]),
@ -362,6 +364,10 @@ class RoomCreationTest(unittest.TestCase):
])
self.room_member_handler = self.handlers.room_member_handler
def hosts(room):
return defer.succeed([])
self.datastore.get_joined_hosts_for_room.side_effect = hosts
@defer.inlineCallbacks
def test_room_creation(self):
user_id = "@foo:red"
@ -385,9 +391,3 @@ class RoomCreationTest(unittest.TestCase):
self.assertTrue(self.state_handler.handle_new_event.called)
self.assertTrue(self.federation.handle_new_event.called)
config_event = self.federation.handle_new_event.call_args[0][0]
self.assertEquals(RoomConfigEvent.TYPE, config_event.type)
self.assertEquals(room_id, config_event.room_id)
self.assertEquals(user_id, config_event.user_id)
self.assertEquals(config, config_event.content)

14
tests/utils.py
View File

@ -234,6 +234,20 @@ class MemoryDataStore(object):
def get_room_events_max_id(self):
return 0 # TODO (erikj)
def get_send_event_level(self, room_id):
return defer.succeed(0)
def get_power_level(self, room_id, user_id):
return defer.succeed(0)
def get_add_state_level(self, room_id):
return defer.succeed(0)
def get_room_join_rule(self, room_id):
# TODO (erikj): This should be configurable
return defer.succeed("invite")
def _format_call(args, kwargs):
return ", ".join(
["%r" % (a) for a in args] +