synapse-product/synapse/handlers/room.py

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# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 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 ._base import BaseHandler
from synapse.types import UserID, RoomAlias, RoomID, RoomStreamToken
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from synapse.api.constants import (
EventTypes, Membership, JoinRules, RoomCreationPreset,
)
from synapse.api.errors import AuthError, StoreError, SynapseError, Codes
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from synapse.util import stringutils, unwrapFirstError
from synapse.util.async import run_on_reactor
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from synapse.util.logcontext import preserve_context_over_fn
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from signedjson.sign import verify_signed_json
from signedjson.key import decode_verify_key_bytes
from collections import OrderedDict
from unpaddedbase64 import decode_base64
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import logging
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import math
import string
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logger = logging.getLogger(__name__)
id_server_scheme = "https://"
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def collect_presencelike_data(distributor, user, content):
return distributor.fire("collect_presencelike_data", user, content)
def user_left_room(distributor, user, room_id):
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return preserve_context_over_fn(
distributor.fire,
"user_left_room", user=user, room_id=room_id
)
def user_joined_room(distributor, user, room_id):
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return preserve_context_over_fn(
distributor.fire,
"user_joined_room", user=user, room_id=room_id
)
class RoomCreationHandler(BaseHandler):
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PRESETS_DICT = {
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RoomCreationPreset.PRIVATE_CHAT: {
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"join_rules": JoinRules.INVITE,
"history_visibility": "shared",
"original_invitees_have_ops": False,
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},
RoomCreationPreset.TRUSTED_PRIVATE_CHAT: {
"join_rules": JoinRules.INVITE,
"history_visibility": "shared",
"original_invitees_have_ops": True,
},
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RoomCreationPreset.PUBLIC_CHAT: {
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"join_rules": JoinRules.PUBLIC,
"history_visibility": "shared",
"original_invitees_have_ops": False,
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},
}
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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:
for wchar in string.whitespace:
if wchar in config["room_alias_name"]:
raise SynapseError(400, "Invalid characters in room alias")
room_alias = RoomAlias.create(
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config["room_alias_name"],
self.hs.hostname,
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)
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:
UserID.from_string(i)
except:
raise SynapseError(400, "Invalid user_id: %s" % (i,))
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invite_3pid_list = config.get("invite_3pid", [])
is_public = config.get("visibility", None) == "public"
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if room_id:
# Ensure room_id is the correct type
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room_id_obj = RoomID.from_string(room_id)
if not self.hs.is_mine(room_id_obj):
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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(
random_string,
self.hs.hostname,
)
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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],
)
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preset_config = config.get(
"preset",
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RoomCreationPreset.PUBLIC_CHAT
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if is_public
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else RoomCreationPreset.PRIVATE_CHAT
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)
raw_initial_state = config.get("initial_state", [])
initial_state = OrderedDict()
for val in raw_initial_state:
initial_state[(val["type"], val.get("state_key", ""))] = val["content"]
creation_content = config.get("creation_content", {})
user = UserID.from_string(user_id)
creation_events = self._create_events_for_new_room(
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user, room_id,
preset_config=preset_config,
invite_list=invite_list,
initial_state=initial_state,
creation_content=creation_content,
room_alias=room_alias,
)
msg_handler = self.hs.get_handlers().message_handler
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for event in creation_events:
yield msg_handler.create_and_send_event(event, ratelimit=False)
if "name" in config:
name = config["name"]
yield msg_handler.create_and_send_event({
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"type": EventTypes.Name,
"room_id": room_id,
"sender": user_id,
"state_key": "",
"content": {"name": name},
}, ratelimit=False)
if "topic" in config:
topic = config["topic"]
yield msg_handler.create_and_send_event({
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"type": EventTypes.Topic,
"room_id": room_id,
"sender": user_id,
"state_key": "",
"content": {"topic": topic},
}, ratelimit=False)
for invitee in invite_list:
yield msg_handler.create_and_send_event({
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"type": EventTypes.Member,
"state_key": invitee,
"room_id": room_id,
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"sender": user_id,
"content": {"membership": Membership.INVITE},
}, ratelimit=False)
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for invite_3pid in invite_3pid_list:
id_server = invite_3pid["id_server"]
address = invite_3pid["address"]
medium = invite_3pid["medium"]
yield self.hs.get_handlers().room_member_handler.do_3pid_invite(
room_id,
user,
medium,
address,
id_server,
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token_id=None,
txn_id=None,
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)
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result = {"room_id": room_id}
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if room_alias:
result["room_alias"] = room_alias.to_string()
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yield directory_handler.send_room_alias_update_event(
user_id, room_id
)
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defer.returnValue(result)
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def _create_events_for_new_room(self, creator, room_id, preset_config,
invite_list, initial_state, creation_content,
room_alias):
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config = RoomCreationHandler.PRESETS_DICT[preset_config]
creator_id = creator.to_string()
event_keys = {
"room_id": room_id,
"sender": creator_id,
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"state_key": "",
}
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def create(etype, content, **kwargs):
e = {
"type": etype,
"content": content,
}
e.update(event_keys)
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e.update(kwargs)
return e
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creation_content.update({"creator": creator.to_string()})
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creation_event = create(
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etype=EventTypes.Create,
content=creation_content,
)
join_event = create(
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etype=EventTypes.Member,
state_key=creator_id,
content={
"membership": Membership.JOIN,
},
)
returned_events = [creation_event, join_event]
if (EventTypes.PowerLevels, '') not in initial_state:
power_level_content = {
"users": {
creator.to_string(): 100,
},
"users_default": 0,
"events": {
EventTypes.Name: 50,
EventTypes.PowerLevels: 100,
EventTypes.RoomHistoryVisibility: 100,
EventTypes.CanonicalAlias: 50,
EventTypes.RoomAvatar: 50,
},
"events_default": 0,
"state_default": 50,
"ban": 50,
"kick": 50,
"redact": 50,
"invite": 0,
}
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if config["original_invitees_have_ops"]:
for invitee in invite_list:
power_level_content["users"][invitee] = 100
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power_levels_event = create(
etype=EventTypes.PowerLevels,
content=power_level_content,
)
returned_events.append(power_levels_event)
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if room_alias and (EventTypes.CanonicalAlias, '') not in initial_state:
room_alias_event = create(
etype=EventTypes.CanonicalAlias,
content={"alias": room_alias.to_string()},
)
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returned_events.append(room_alias_event)
if (EventTypes.JoinRules, '') not in initial_state:
join_rules_event = create(
etype=EventTypes.JoinRules,
content={"join_rule": config["join_rules"]},
)
returned_events.append(join_rules_event)
if (EventTypes.RoomHistoryVisibility, '') not in initial_state:
history_event = create(
etype=EventTypes.RoomHistoryVisibility,
content={"history_visibility": config["history_visibility"]}
)
returned_events.append(history_event)
for (etype, state_key), content in initial_state.items():
returned_events.append(create(
etype=etype,
state_key=state_key,
content=content,
))
return returned_events
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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")
self.distributor.declare("user_left_room")
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@defer.inlineCallbacks
def get_room_members(self, room_id):
users = yield self.store.get_users_in_room(room_id)
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defer.returnValue([UserID.from_string(u) for u in users])
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@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):
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if localusers is not None:
localusers.add(member)
else:
if remotedomains is not None:
remotedomains.add(member.domain)
@defer.inlineCallbacks
def update_membership(self, requester, target, room_id, action, txn_id=None):
effective_membership_state = action
if action in ["kick", "unban"]:
effective_membership_state = "leave"
elif action == "forget":
effective_membership_state = "leave"
msg_handler = self.hs.get_handlers().message_handler
content = {"membership": unicode(effective_membership_state)}
if requester.is_guest:
content["kind"] = "guest"
event, context = yield msg_handler.create_event(
{
"type": EventTypes.Member,
"content": content,
"room_id": room_id,
"sender": requester.user.to_string(),
"state_key": target.to_string(),
},
token_id=requester.access_token_id,
txn_id=txn_id,
)
old_state = context.current_state.get((EventTypes.Member, event.state_key))
old_membership = old_state.content.get("membership") if old_state else None
if action == "unban" and old_membership != "ban":
raise SynapseError(
403,
"Cannot unban user who was not banned (membership=%s)" % old_membership,
errcode=Codes.BAD_STATE
)
if old_membership == "ban" and action != "unban":
raise SynapseError(
403,
"Cannot %s user who was is banned" % (action,),
errcode=Codes.BAD_STATE
)
yield msg_handler.send_event(
event,
context,
ratelimit=True,
is_guest=requester.is_guest
)
if action == "forget":
yield self.forget(requester.user, room_id)
@defer.inlineCallbacks
def send_membership_event(self, event, context, is_guest=False):
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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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prev_state = context.current_state.get(
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(EventTypes.Member, target_user_id),
None
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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:
if is_guest:
guest_access = context.current_state.get(
(EventTypes.GuestAccess, ""),
None
)
is_guest_access_allowed = (
guest_access
and guest_access.content
and "guest_access" in guest_access.content
and guest_access.content["guest_access"] == "can_join"
)
if not is_guest_access_allowed:
raise AuthError(403, "Guest access not allowed")
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yield self._do_join(event, context)
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else:
if event.membership == Membership.LEAVE:
is_host_in_room = yield self.is_host_in_room(room_id, context)
if not is_host_in_room:
# Rejecting an invite, rather than leaving a joined room
handler = self.hs.get_handlers().federation_handler
inviter = yield self.get_inviter(event)
if not inviter:
# return the same error as join_room_alias does
raise SynapseError(404, "No known servers")
yield handler.do_remotely_reject_invite(
[inviter.domain],
room_id,
event.user_id
)
defer.returnValue({"room_id": room_id})
return
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# FIXME: This isn't idempotency.
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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,
context=context,
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)
if prev_state and prev_state.membership == Membership.JOIN:
user = UserID.from_string(event.user_id)
user_left_room(self.distributor, user, event.room_id)
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defer.returnValue({"room_id": room_id})
@defer.inlineCallbacks
def join_room_alias(self, joinee, room_alias, content={}):
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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")
# If event doesn't include a display name, add one.
yield collect_presencelike_data(self.distributor, joinee, content)
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content.update({"membership": Membership.JOIN})
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builder = self.event_builder_factory.new({
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"type": EventTypes.Member,
"state_key": joinee.to_string(),
"room_id": room_id,
"sender": joinee.to_string(),
"membership": Membership.JOIN,
"content": content,
})
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event, context = yield self._create_new_client_event(builder)
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yield self._do_join(event, context, room_hosts=hosts)
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defer.returnValue({"room_id": room_id})
@defer.inlineCallbacks
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def _do_join(self, event, context, room_hosts=None):
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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.is_host_in_room(room_id, context)
if is_host_in_room:
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should_do_dance = False
elif room_hosts: # TODO: Shouldn't this be remote_room_host?
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should_do_dance = True
else:
inviter = yield self.get_inviter(event)
if not inviter:
# return the same error as join_room_alias does
raise SynapseError(404, "No known servers")
should_do_dance = not self.hs.is_mine(inviter)
room_hosts = [inviter.domain]
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if should_do_dance:
handler = self.hs.get_handlers().federation_handler
yield handler.do_invite_join(
room_hosts,
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room_id,
event.user_id,
event.content,
)
else:
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logger.debug("Doing normal join")
yield self._do_local_membership_update(
event,
context=context,
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)
prev_state = context.current_state.get((event.type, event.state_key))
if not prev_state or prev_state.membership != Membership.JOIN:
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# Only fire user_joined_room if the user has acutally joined the
# room. Don't bother if the user is just changing their profile
# info.
user = UserID.from_string(event.user_id)
yield user_joined_room(self.distributor, user, room_id)
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@defer.inlineCallbacks
def get_inviter(self, event):
# TODO(markjh): get prev_state from snapshot
prev_state = yield self.store.get_room_member(
event.user_id, event.room_id
)
if prev_state and prev_state.membership == Membership.INVITE:
defer.returnValue(UserID.from_string(prev_state.user_id))
return
elif "third_party_invite" in event.content:
if "sender" in event.content["third_party_invite"]:
inviter = UserID.from_string(
event.content["third_party_invite"]["sender"]
)
defer.returnValue(inviter)
defer.returnValue(None)
@defer.inlineCallbacks
def is_host_in_room(self, room_id, context):
is_host_in_room = yield self.auth.check_host_in_room(
room_id,
self.hs.hostname
)
if not is_host_in_room:
# is *anyone* in the room?
room_member_keys = [
v for (k, v) in context.current_state.keys() if (
k == "m.room.member"
)
]
if len(room_member_keys) == 0:
# has the room been created so we can join it?
create_event = context.current_state.get(("m.room.create", ""))
if create_event:
is_host_in_room = True
defer.returnValue(is_host_in_room)
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@defer.inlineCallbacks
def get_joined_rooms_for_user(self, user):
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"""Returns a list of roomids that the user has any of the given
membership states in."""
rooms = yield self.store.get_rooms_for_user(
user.to_string(),
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)
# 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)
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@defer.inlineCallbacks
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def _do_local_membership_update(self, event, context):
yield run_on_reactor()
target_user = UserID.from_string(event.state_key)
yield self.handle_new_client_event(
event,
context,
extra_users=[target_user],
)
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@defer.inlineCallbacks
def do_3pid_invite(
self,
room_id,
inviter,
medium,
address,
id_server,
token_id,
txn_id
):
invitee = yield self._lookup_3pid(
id_server, medium, address
)
if invitee:
# make sure it looks like a user ID; it'll throw if it's invalid.
UserID.from_string(invitee)
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yield self.hs.get_handlers().message_handler.create_and_send_event(
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{
"type": EventTypes.Member,
"content": {
"membership": unicode("invite")
},
"room_id": room_id,
"sender": inviter.to_string(),
"state_key": invitee,
},
token_id=token_id,
txn_id=txn_id,
)
else:
yield self._make_and_store_3pid_invite(
id_server,
medium,
address,
room_id,
inviter,
token_id,
txn_id=txn_id
)
@defer.inlineCallbacks
def _lookup_3pid(self, id_server, medium, address):
"""Looks up a 3pid in the passed identity server.
Args:
id_server (str): The server name (including port, if required)
of the identity server to use.
medium (str): The type of the third party identifier (e.g. "email").
address (str): The third party identifier (e.g. "foo@example.com").
Returns:
(str) the matrix ID of the 3pid, or None if it is not recognized.
"""
try:
data = yield self.hs.get_simple_http_client().get_json(
"%s%s/_matrix/identity/api/v1/lookup" % (id_server_scheme, id_server,),
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{
"medium": medium,
"address": address,
}
)
if "mxid" in data:
if "signatures" not in data:
raise AuthError(401, "No signatures on 3pid binding")
self.verify_any_signature(data, id_server)
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defer.returnValue(data["mxid"])
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except IOError as e:
logger.warn("Error from identity server lookup: %s" % (e,))
defer.returnValue(None)
@defer.inlineCallbacks
def verify_any_signature(self, data, server_hostname):
if server_hostname not in data["signatures"]:
raise AuthError(401, "No signature from server %s" % (server_hostname,))
for key_name, signature in data["signatures"][server_hostname].items():
key_data = yield self.hs.get_simple_http_client().get_json(
"%s%s/_matrix/identity/api/v1/pubkey/%s" %
(id_server_scheme, server_hostname, key_name,),
)
if "public_key" not in key_data:
raise AuthError(401, "No public key named %s from %s" %
(key_name, server_hostname,))
verify_signed_json(
data,
server_hostname,
decode_verify_key_bytes(key_name, decode_base64(key_data["public_key"]))
)
return
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@defer.inlineCallbacks
def _make_and_store_3pid_invite(
self,
id_server,
medium,
address,
room_id,
user,
token_id,
txn_id
):
room_state = yield self.hs.get_state_handler().get_current_state(room_id)
inviter_display_name = ""
inviter_avatar_url = ""
member_event = room_state.get((EventTypes.Member, user.to_string()))
if member_event:
inviter_display_name = member_event.content.get("displayname", "")
inviter_avatar_url = member_event.content.get("avatar_url", "")
canonical_room_alias = ""
canonical_alias_event = room_state.get((EventTypes.CanonicalAlias, ""))
if canonical_alias_event:
canonical_room_alias = canonical_alias_event.content.get("alias", "")
room_name = ""
room_name_event = room_state.get((EventTypes.Name, ""))
if room_name_event:
room_name = room_name_event.content.get("name", "")
room_join_rules = ""
join_rules_event = room_state.get((EventTypes.JoinRules, ""))
if join_rules_event:
room_join_rules = join_rules_event.content.get("join_rule", "")
room_avatar_url = ""
room_avatar_event = room_state.get((EventTypes.RoomAvatar, ""))
if room_avatar_event:
room_avatar_url = room_avatar_event.content.get("url", "")
token, public_key, key_validity_url, display_name = (
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yield self._ask_id_server_for_third_party_invite(
id_server=id_server,
medium=medium,
address=address,
room_id=room_id,
inviter_user_id=user.to_string(),
room_alias=canonical_room_alias,
room_avatar_url=room_avatar_url,
room_join_rules=room_join_rules,
room_name=room_name,
inviter_display_name=inviter_display_name,
inviter_avatar_url=inviter_avatar_url
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)
)
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msg_handler = self.hs.get_handlers().message_handler
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yield msg_handler.create_and_send_event(
{
"type": EventTypes.ThirdPartyInvite,
"content": {
"display_name": display_name,
"key_validity_url": key_validity_url,
"public_key": public_key,
},
"room_id": room_id,
"sender": user.to_string(),
"state_key": token,
},
token_id=token_id,
txn_id=txn_id,
)
@defer.inlineCallbacks
def _ask_id_server_for_third_party_invite(
self,
id_server,
medium,
address,
room_id,
inviter_user_id,
room_alias,
room_avatar_url,
room_join_rules,
room_name,
inviter_display_name,
inviter_avatar_url
):
is_url = "%s%s/_matrix/identity/api/v1/store-invite" % (
id_server_scheme, id_server,
)
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data = yield self.hs.get_simple_http_client().post_urlencoded_get_json(
is_url,
{
"medium": medium,
"address": address,
"room_id": room_id,
"room_alias": room_alias,
"room_avatar_url": room_avatar_url,
"room_join_rules": room_join_rules,
"room_name": room_name,
"sender": inviter_user_id,
"sender_display_name": inviter_display_name,
"sender_avatar_url": inviter_avatar_url,
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}
)
# TODO: Check for success
token = data["token"]
public_key = data["public_key"]
display_name = data["display_name"]
key_validity_url = "%s%s/_matrix/identity/api/v1/pubkey/isvalid" % (
id_server_scheme, id_server,
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)
defer.returnValue((token, public_key, key_validity_url, display_name))
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def forget(self, user, room_id):
return self.store.forget(user.to_string(), room_id)
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class RoomListHandler(BaseHandler):
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@defer.inlineCallbacks
def get_public_room_list(self):
room_ids = yield self.store.get_public_room_ids()
@defer.inlineCallbacks
def handle_room(room_id):
aliases = yield self.store.get_aliases_for_room(room_id)
if not aliases:
defer.returnValue(None)
state = yield self.state_handler.get_current_state(room_id)
result = {"aliases": aliases, "room_id": room_id}
name_event = state.get((EventTypes.Name, ""), None)
if name_event:
name = name_event.content.get("name", None)
if name:
result["name"] = name
topic_event = state.get((EventTypes.Topic, ""), None)
if topic_event:
topic = topic_event.content.get("topic", None)
if topic:
result["topic"] = topic
canonical_event = state.get((EventTypes.CanonicalAlias, ""), None)
if canonical_event:
canonical_alias = canonical_event.content.get("alias", None)
if canonical_alias:
result["canonical_alias"] = canonical_alias
visibility_event = state.get((EventTypes.RoomHistoryVisibility, ""), None)
visibility = None
if visibility_event:
visibility = visibility_event.content.get("history_visibility", None)
result["world_readable"] = visibility == "world_readable"
guest_event = state.get((EventTypes.GuestAccess, ""), None)
guest = None
if guest_event:
guest = guest_event.content.get("guest_access", None)
result["guest_can_join"] = guest == "can_join"
avatar_event = state.get(("m.room.avatar", ""), None)
if avatar_event:
avatar_url = avatar_event.content.get("url", None)
if avatar_url:
result["avatar_url"] = avatar_url
result["num_joined_members"] = sum(
1 for (event_type, _), ev in state.items()
if event_type == EventTypes.Member and ev.membership == Membership.JOIN
)
defer.returnValue(result)
result = []
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for chunk in (room_ids[i:i + 10] for i in xrange(0, len(room_ids), 10)):
chunk_result = yield defer.gatherResults([
handle_room(room_id)
for room_id in chunk
], consumeErrors=True).addErrback(unwrapFirstError)
result.extend(v for v in chunk_result if v)
# FIXME (erikj): START is no longer a valid value
defer.returnValue({"start": "START", "end": "END", "chunk": result})
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class RoomContextHandler(BaseHandler):
@defer.inlineCallbacks
def get_event_context(self, user, room_id, event_id, limit, is_guest):
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"""Retrieves events, pagination tokens and state around a given event
in a room.
Args:
user (UserID)
room_id (str)
event_id (str)
limit (int): The maximum number of events to return in total
(excluding state).
Returns:
dict, or None if the event isn't found
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"""
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before_limit = math.floor(limit / 2.)
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after_limit = limit - before_limit
now_token = yield self.hs.get_event_sources().get_current_token()
def filter_evts(events):
return self._filter_events_for_client(
user.to_string(),
events,
is_peeking=is_guest)
event = yield self.store.get_event(event_id, get_prev_content=True,
allow_none=True)
if not event:
defer.returnValue(None)
return
filtered = yield(filter_evts([event]))
if not filtered:
raise AuthError(
403,
"You don't have permission to access that event."
)
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results = yield self.store.get_events_around(
room_id, event_id, before_limit, after_limit
)
results["events_before"] = yield filter_evts(results["events_before"])
results["events_after"] = yield filter_evts(results["events_after"])
results["event"] = event
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if results["events_after"]:
last_event_id = results["events_after"][-1].event_id
else:
last_event_id = event_id
state = yield self.store.get_state_for_events(
[last_event_id], None
)
results["state"] = state[last_event_id].values()
results["start"] = now_token.copy_and_replace(
"room_key", results["start"]
).to_string()
results["end"] = now_token.copy_and_replace(
"room_key", results["end"]
).to_string()
defer.returnValue(results)
class RoomEventSource(object):
def __init__(self, hs):
self.store = hs.get_datastore()
@defer.inlineCallbacks
def get_new_events(
self,
user,
from_key,
limit,
room_ids,
is_guest,
):
# We just ignore the key for now.
to_key = yield self.get_current_key()
from_token = RoomStreamToken.parse(from_key)
if from_token.topological:
logger.warn("Stream has topological part!!!! %r", from_key)
from_key = "s%s" % (from_token.stream,)
app_service = yield self.store.get_app_service_by_user_id(
user.to_string()
)
if app_service:
events, end_key = yield self.store.get_appservice_room_stream(
service=app_service,
from_key=from_key,
to_key=to_key,
limit=limit,
)
else:
room_events = yield self.store.get_membership_changes_for_user(
user.to_string(), from_key, to_key
)
room_to_events = yield self.store.get_room_events_stream_for_rooms(
room_ids=room_ids,
from_key=from_key,
to_key=to_key,
limit=limit or 10,
)
events = list(room_events)
events.extend(e for evs, _ in room_to_events.values() for e in evs)
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events.sort(key=lambda e: e.internal_metadata.order)
if limit:
events[:] = events[:limit]
if events:
end_key = events[-1].internal_metadata.after
else:
end_key = to_key
defer.returnValue((events, end_key))
def get_current_key(self, direction='f'):
return self.store.get_room_events_max_id(direction)
@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,
)
defer.returnValue((events, next_key))