MatrixSynapse/synapse/handlers/room.py

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# -*- coding: utf-8 -*-
# Copyright 2014 OpenMarket Ltd
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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"""Contains functions for performing events on rooms."""
from twisted.internet import defer
from synapse.types import UserID, RoomAlias, RoomID
from synapse.api.constants import Membership, JoinRules
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from synapse.api.errors import StoreError, SynapseError
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from synapse.api.events.room import (
RoomMemberEvent, RoomCreateEvent, RoomPowerLevelsEvent,
RoomTopicEvent, RoomNameEvent, RoomJoinRulesEvent,
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)
from synapse.util import stringutils
from synapse.util.async import run_on_reactor
from ._base import BaseHandler
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import logging
logger = logging.getLogger(__name__)
class RoomCreationHandler(BaseHandler):
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@defer.inlineCallbacks
def create_room(self, user_id, room_id, config):
""" Creates a new room.
Args:
user_id (str): The ID of the user creating the new room.
room_id (str): The proposed ID for the new room. Can be None, in
which case one will be created for you.
config (dict) : A dict of configuration options.
Returns:
The new room ID.
Raises:
SynapseError if the room ID was taken, couldn't be stored, or
something went horribly wrong.
"""
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self.ratelimit(user_id)
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if "room_alias_name" in config:
room_alias = RoomAlias.create_local(
config["room_alias_name"],
self.hs
)
mapping = yield self.store.get_association_from_room_alias(
room_alias
)
if mapping:
raise SynapseError(400, "Room alias already taken")
else:
room_alias = None
invite_list = config.get("invite", [])
for i in invite_list:
try:
self.hs.parse_userid(i)
except:
raise SynapseError(400, "Invalid user_id: %s" % (i,))
is_public = config.get("visibility", None) == "public"
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if room_id:
# Ensure room_id is the correct type
room_id_obj = RoomID.from_string(room_id, self.hs)
if not room_id_obj.is_mine:
raise SynapseError(400, "Room id must be local")
yield self.store.store_room(
room_id=room_id,
room_creator_user_id=user_id,
is_public=is_public
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)
else:
# autogen room IDs and try to create it. We may clash, so just
# try a few times till one goes through, giving up eventually.
attempts = 0
room_id = None
while attempts < 5:
try:
random_string = stringutils.random_string(18)
gen_room_id = RoomID.create_local(random_string, self.hs)
yield self.store.store_room(
room_id=gen_room_id.to_string(),
room_creator_user_id=user_id,
is_public=is_public
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)
room_id = gen_room_id.to_string()
break
except StoreError:
attempts += 1
if not room_id:
raise StoreError(500, "Couldn't generate a room ID.")
if room_alias:
directory_handler = self.hs.get_handlers().directory_handler
yield directory_handler.create_association(
user_id=user_id,
room_id=room_id,
room_alias=room_alias,
servers=[self.hs.hostname],
)
user = self.hs.parse_userid(user_id)
creation_events = self._create_events_for_new_room(
user, room_id, is_public=is_public
)
room_member_handler = self.hs.get_handlers().room_member_handler
@defer.inlineCallbacks
def handle_event(event):
snapshot = yield self.store.snapshot_room(event)
logger.debug("Event: %s", event)
if event.type == RoomMemberEvent.TYPE:
yield room_member_handler.change_membership(
event,
do_auth=True
)
else:
yield self._on_new_room_event(
event, snapshot, extra_users=[user], suppress_auth=True
)
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for event in creation_events:
yield handle_event(event)
if "name" in config:
name = config["name"]
name_event = self.event_factory.create_event(
etype=RoomNameEvent.TYPE,
room_id=room_id,
user_id=user_id,
content={"name": name},
)
yield handle_event(name_event)
if "topic" in config:
topic = config["topic"]
topic_event = self.event_factory.create_event(
etype=RoomTopicEvent.TYPE,
room_id=room_id,
user_id=user_id,
content={"topic": topic},
)
yield handle_event(topic_event)
content = {"membership": Membership.INVITE}
for invitee in invite_list:
invite_event = self.event_factory.create_event(
etype=RoomMemberEvent.TYPE,
state_key=invitee,
room_id=room_id,
user_id=user_id,
content=content
)
yield handle_event(invite_event)
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result = {"room_id": room_id}
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if room_alias:
result["room_alias"] = room_alias.to_string()
directory_handler.send_room_alias_update_event(user_id, room_id)
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defer.returnValue(result)
def _create_events_for_new_room(self, creator, room_id, is_public=False):
creator_id = creator.to_string()
event_keys = {
"room_id": room_id,
"user_id": creator_id,
}
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def create(etype, **content):
return self.event_factory.create_event(
etype=etype,
content=content,
**event_keys
)
creation_event = create(
etype=RoomCreateEvent.TYPE,
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creator=creator.to_string(),
)
join_event = self.event_factory.create_event(
etype=RoomMemberEvent.TYPE,
state_key=creator_id,
content={
"membership": Membership.JOIN,
},
**event_keys
)
power_levels_event = self.event_factory.create_event(
etype=RoomPowerLevelsEvent.TYPE,
content={
"users": {
creator.to_string(): 100,
},
"users_default": 0,
"events": {
RoomNameEvent.TYPE: 100,
RoomPowerLevelsEvent.TYPE: 100,
},
"events_default": 0,
"state_default": 50,
"ban": 50,
"kick": 50,
"redact": 50
},
**event_keys
)
join_rule = JoinRules.PUBLIC if is_public else JoinRules.INVITE
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join_rules_event = create(
etype=RoomJoinRulesEvent.TYPE,
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join_rule=join_rule,
)
return [
creation_event,
join_event,
power_levels_event,
join_rules_event,
]
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class RoomMemberHandler(BaseHandler):
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# TODO(paul): This handler currently contains a messy conflation of
# low-level API that works on UserID objects and so on, and REST-level
# API that takes ID strings and returns pagination chunks. These concerns
# ought to be separated out a lot better.
def __init__(self, hs):
super(RoomMemberHandler, self).__init__(hs)
self.clock = hs.get_clock()
self.distributor = hs.get_distributor()
self.distributor.declare("user_joined_room")
@defer.inlineCallbacks
def get_room_members(self, room_id, membership=Membership.JOIN):
hs = self.hs
memberships = yield self.store.get_room_members(
room_id=room_id, membership=membership
)
defer.returnValue([hs.parse_userid(m.user_id) for m in memberships])
@defer.inlineCallbacks
def fetch_room_distributions_into(self, room_id, localusers=None,
remotedomains=None, ignore_user=None):
"""Fetch the distribution of a room, adding elements to either
'localusers' or 'remotedomains', which should be a set() if supplied.
If ignore_user is set, ignore that user.
This function returns nothing; its result is performed by the
side-effect on the two passed sets. This allows easy accumulation of
member lists of multiple rooms at once if required.
"""
members = yield self.get_room_members(room_id)
for member in members:
if ignore_user is not None and member == ignore_user:
continue
if member.is_mine:
if localusers is not None:
localusers.add(member)
else:
if remotedomains is not None:
remotedomains.add(member.domain)
@defer.inlineCallbacks
def get_room_members_as_pagination_chunk(self, room_id=None, user_id=None,
limit=0, start_tok=None,
end_tok=None):
"""Retrieve a list of room members in the room.
Args:
room_id (str): The room to get the member list for.
user_id (str): The ID of the user making the request.
limit (int): The max number of members to return.
start_tok (str): Optional. The start token if known.
end_tok (str): Optional. The end token if known.
Returns:
dict: A Pagination streamable dict.
Raises:
SynapseError if something goes wrong.
"""
yield self.auth.check_joined_room(room_id, user_id)
member_list = yield self.store.get_room_members(room_id=room_id)
event_list = [
self.hs.serialize_event(entry)
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for entry in member_list
]
chunk_data = {
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"start": "START", # FIXME (erikj): START is no longer valid
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"end": "END",
"chunk": event_list
}
# TODO honor Pagination stream params
# TODO snapshot this list to return on subsequent requests when
# paginating
defer.returnValue(chunk_data)
@defer.inlineCallbacks
def get_room_member(self, room_id, member_user_id, auth_user_id):
"""Retrieve a room member from a room.
Args:
room_id : The room the member is in.
member_user_id : The member's user ID
auth_user_id : The user ID of the user making this request.
Returns:
The room member, or None if this member does not exist.
Raises:
SynapseError if something goes wrong.
"""
yield self.auth.check_joined_room(room_id, auth_user_id)
member = yield self.store.get_room_member(user_id=member_user_id,
room_id=room_id)
defer.returnValue(member)
@defer.inlineCallbacks
def change_membership(self, event=None, do_auth=True):
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""" Change the membership status of a user in a room.
Args:
event (SynapseEvent): The membership event
Raises:
SynapseError if there was a problem changing the membership.
"""
target_user_id = event.state_key
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snapshot = yield self.store.snapshot_room(event)
## TODO(markjh): get prev state from snapshot.
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prev_state = yield self.store.get_room_member(
target_user_id, event.room_id
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)
room_id = event.room_id
# If we're trying to join a room then we have to do this differently
# if this HS is not currently in the room, i.e. we have to do the
# invite/join dance.
if event.membership == Membership.JOIN:
yield self._do_join(event, snapshot, do_auth=do_auth)
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else:
# This is not a JOIN, so we can handle it normally.
if prev_state and prev_state.membership == event.membership:
# double same action, treat this event as a NOOP.
defer.returnValue({})
return
yield self._do_local_membership_update(
event,
membership=event.content["membership"],
snapshot=snapshot,
do_auth=do_auth,
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)
defer.returnValue({"room_id": room_id})
@defer.inlineCallbacks
def join_room_alias(self, joinee, room_alias, do_auth=True, content={}):
directory_handler = self.hs.get_handlers().directory_handler
mapping = yield directory_handler.get_association(room_alias)
if not mapping:
raise SynapseError(404, "No such room alias")
room_id = mapping["room_id"]
hosts = mapping["servers"]
if not hosts:
raise SynapseError(404, "No known servers")
host = hosts[0]
content.update({"membership": Membership.JOIN})
new_event = self.event_factory.create_event(
etype=RoomMemberEvent.TYPE,
state_key=joinee.to_string(),
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room_id=room_id,
user_id=joinee.to_string(),
membership=Membership.JOIN,
content=content,
)
snapshot = yield self.store.snapshot_room(new_event)
yield self._do_join(new_event, snapshot, room_host=host, do_auth=True)
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defer.returnValue({"room_id": room_id})
@defer.inlineCallbacks
def _do_join(self, event, snapshot, room_host=None, do_auth=True):
joinee = self.hs.parse_userid(event.state_key)
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# room_id = RoomID.from_string(event.room_id, self.hs)
room_id = event.room_id
# If event doesn't include a display name, add one.
yield self.distributor.fire(
"collect_presencelike_data", joinee, event.content
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)
# XXX: We don't do an auth check if we are doing an invite
# join dance for now, since we're kinda implicitly checking
# that we are allowed to join when we decide whether or not we
# need to do the invite/join dance.
is_host_in_room = yield self.auth.check_host_in_room(
event.room_id,
self.hs.hostname
)
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if is_host_in_room:
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should_do_dance = False
elif room_host:
should_do_dance = True
else:
# TODO(markjh): get prev_state from snapshot
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prev_state = yield self.store.get_room_member(
joinee.to_string(), room_id
)
if prev_state and prev_state.membership == Membership.INVITE:
room = yield self.store.get_room(room_id)
inviter = UserID.from_string(
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prev_state.user_id, self.hs
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)
should_do_dance = not inviter.is_mine and not room
room_host = inviter.domain
else:
should_do_dance = False
have_joined = False
if should_do_dance:
handler = self.hs.get_handlers().federation_handler
have_joined = yield handler.do_invite_join(
room_host, room_id, event.user_id, event.content, snapshot
)
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# We want to do the _do_update inside the room lock.
if not have_joined:
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logger.debug("Doing normal join")
yield self._do_local_membership_update(
event,
membership=event.content["membership"],
snapshot=snapshot,
do_auth=do_auth,
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)
user = self.hs.parse_userid(event.user_id)
self.distributor.fire(
"user_joined_room", user=user, room_id=room_id
)
@defer.inlineCallbacks
def _should_invite_join(self, room_id, prev_state, do_auth):
logger.debug("_should_invite_join: room_id: %s", room_id)
# XXX: We don't do an auth check if we are doing an invite
# join dance for now, since we're kinda implicitly checking
# that we are allowed to join when we decide whether or not we
# need to do the invite/join dance.
# Only do an invite join dance if a) we were invited,
# b) the person inviting was from a differnt HS and c) we are
# not currently in the room
room_host = None
if prev_state and prev_state.membership == Membership.INVITE:
room = yield self.store.get_room(room_id)
inviter = UserID.from_string(
prev_state.sender, self.hs
)
is_remote_invite_join = not inviter.is_mine and not room
room_host = inviter.domain
else:
is_remote_invite_join = False
defer.returnValue((is_remote_invite_join, room_host))
@defer.inlineCallbacks
def get_rooms_for_user(self, user, membership_list=[Membership.JOIN]):
"""Returns a list of roomids that the user has any of the given
membership states in."""
rooms = yield self.store.get_rooms_for_user_where_membership_is(
user_id=user.to_string(), membership_list=membership_list
)
defer.returnValue([r.room_id for r in rooms])
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@defer.inlineCallbacks
def _do_local_membership_update(self, event, membership, snapshot,
do_auth):
yield run_on_reactor()
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# If we're inviting someone, then we should also send it to that
# HS.
target_user_id = event.state_key
target_user = self.hs.parse_userid(target_user_id)
if membership == Membership.INVITE and not target_user.is_mine:
do_invite_host = target_user.domain
else:
do_invite_host = None
yield self._on_new_room_event(
event,
snapshot,
extra_users=[target_user],
suppress_auth=(not do_auth),
do_invite_host=do_invite_host,
)
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class RoomListHandler(BaseHandler):
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@defer.inlineCallbacks
def get_public_room_list(self):
chunk = yield self.store.get_rooms(is_public=True)
for room in chunk:
joined_members = yield self.store.get_room_members(
room_id=room["room_id"],
membership=Membership.JOIN
)
room["num_joined_members"] = len(joined_members)
# FIXME (erikj): START is no longer a valid value
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defer.returnValue({"start": "START", "end": "END", "chunk": chunk})
class RoomEventSource(object):
def __init__(self, hs):
self.store = hs.get_datastore()
@defer.inlineCallbacks
def get_new_events_for_user(self, user, from_key, limit):
# We just ignore the key for now.
to_key = yield self.get_current_key()
events, end_key = yield self.store.get_room_events_stream(
user_id=user.to_string(),
from_key=from_key,
to_key=to_key,
room_id=None,
limit=limit,
)
defer.returnValue((events, end_key))
def get_current_key(self):
return self.store.get_room_events_max_id()
@defer.inlineCallbacks
def get_pagination_rows(self, user, config, key):
events, next_key = yield self.store.paginate_room_events(
room_id=key,
from_key=config.from_key,
to_key=config.to_key,
direction=config.direction,
limit=config.limit,
with_feedback=True
)
defer.returnValue((events, next_key))