# -*- coding: utf-8 -*-
# Copyright 2014 OpenMarket Ltd
#
# 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.
"""Contains functions for performing events on rooms."""
from twisted.internet import defer
from synapse.types import UserID, RoomAlias, RoomID
from synapse.api.constants import EventTypes, Membership, JoinRules
from synapse.api.errors import StoreError, SynapseError
from synapse.util import stringutils
from synapse.util.async import run_on_reactor
from ._base import BaseHandler
import logging
logger = logging.getLogger(__name__)
class RoomCreationHandler(BaseHandler):
@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.
"""
self.ratelimit(user_id)
if "room_alias_name" in config:
room_alias = RoomAlias.create(
config["room_alias_name"],
self.hs.hostname,
)
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"
if room_id:
# Ensure room_id is the correct type
room_id_obj = RoomID.from_string(room_id)
if not self.hs.is_mine(room_id_obj):
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
)
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(
random_string,
self.hs.hostname,
)
yield self.store.store_room(
room_id=gen_room_id.to_string(),
room_creator_user_id=user_id,
is_public=is_public
)
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
)
msg_handler = self.hs.get_handlers().message_handler
for event in creation_events:
yield msg_handler.create_and_send_event(event)
if "name" in config:
name = config["name"]
yield msg_handler.create_and_send_event({
"type": EventTypes.Name,
"room_id": room_id,
"sender": user_id,
"content": {"name": name},
})
if "topic" in config:
topic = config["topic"]
yield msg_handler.create_and_send_event({
"type": EventTypes.Topic,
"room_id": room_id,
"sender": user_id,
"content": {"topic": topic},
})
for invitee in invite_list:
yield msg_handler.create_and_send_event({
"type": EventTypes.Member,
"state_key": invitee,
"room_id": room_id,
"user_id": user_id,
"content": {"membership": Membership.INVITE},
})
result = {"room_id": room_id}
if room_alias:
result["room_alias"] = room_alias.to_string()
yield directory_handler.send_room_alias_update_event(
user_id, room_id
)
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,
"sender": creator_id,
"state_key": "",
}
def create(etype, content, **kwargs):
e = {
"type": etype,
"content": content,
}
e.update(event_keys)
e.update(kwargs)
return e
creation_event = create(
etype=EventTypes.Create,
content={"creator": creator.to_string()},
)
join_event = create(
etype=EventTypes.Member,
state_key=creator_id,
content={
"membership": Membership.JOIN,
},
)
power_levels_event = create(
etype=EventTypes.PowerLevels,
content={
"users": {
creator.to_string(): 100,
},
"users_default": 0,
"events": {
EventTypes.Name: 100,
EventTypes.PowerLevels: 100,
},
"events_default": 0,
"state_default": 50,
"ban": 50,
"kick": 50,
"redact": 50
},
)
join_rule = JoinRules.PUBLIC if is_public else JoinRules.INVITE
join_rules_event = create(
etype=EventTypes.JoinRules,
content={"join_rule": join_rule},
)
return [
creation_event,
join_event,
power_levels_event,
join_rules_event,
]
class RoomMemberHandler(BaseHandler):
# 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")
self.distributor.declare("user_left_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 self.hs.is_mine(member):
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)
for entry in member_list
]
chunk_data = {
"start": "START", # FIXME (erikj): START is no longer valid
"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, context, do_auth=True):
""" 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
prev_state = context.current_state.get(
(EventTypes.Member, target_user_id),
None
)
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, context, do_auth=do_auth)
else:
# This is not a JOIN, so we can handle it normally.
# FIXME: This isn't idempotency.
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"],
context=context,
do_auth=do_auth,
)
if prev_state and prev_state.membership == Membership.JOIN:
user = self.hs.parse_userid(event.user_id)
self.distributor.fire(
"user_left_room", user=user, room_id=event.room_id
)
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})
builder = self.event_builder_factory.new({
"type": EventTypes.Member,
"state_key": joinee.to_string(),
"room_id": room_id,
"sender": joinee.to_string(),
"membership": Membership.JOIN,
"content": content,
})
event, context = yield self._create_new_client_event(builder)
yield self._do_join(event, context, room_host=host, do_auth=True)
defer.returnValue({"room_id": room_id})
@defer.inlineCallbacks
def _do_join(self, event, context, room_host=None, do_auth=True):
joinee = self.hs.parse_userid(event.state_key)
# room_id = RoomID.from_string(event.room_id, self.hs)
room_id = event.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.
is_host_in_room = yield self.auth.check_host_in_room(
event.room_id,
self.hs.hostname
)
if is_host_in_room:
should_do_dance = False
elif room_host:
should_do_dance = True
else:
# TODO(markjh): get prev_state from snapshot
prev_state = yield self.store.get_room_member(
joinee.to_string(), room_id
)
if prev_state and prev_state.membership == Membership.INVITE:
inviter = UserID.from_string(prev_state.user_id)
should_do_dance = not self.hs.is_mine(inviter)
room_host = inviter.domain
else:
should_do_dance = False
if should_do_dance:
handler = self.hs.get_handlers().federation_handler
yield handler.do_invite_join(
room_host,
room_id,
event.user_id,
event.get_dict()["content"], # FIXME To get a non-frozen dict
context
)
else:
logger.debug("Doing normal join")
yield self._do_local_membership_update(
event,
membership=event.content["membership"],
context=context,
do_auth=do_auth,
)
user = self.hs.parse_userid(event.user_id)
yield 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
)
is_remote_invite_join = not self.hs.is_mine(inviter) 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
)
# For some reason the list of events contains duplicates
# TODO(paul): work out why because I really don't think it should
room_ids = set(r.room_id for r in rooms)
defer.returnValue(room_ids)
@defer.inlineCallbacks
def _do_local_membership_update(self, event, membership, context,
do_auth):
yield run_on_reactor()
target_user = self.hs.parse_userid(event.state_key)
yield self.handle_new_client_event(
event,
context,
extra_users=[target_user],
suppress_auth=(not do_auth),
)
class RoomListHandler(BaseHandler):
@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
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))