MatrixSynapse/synapse/handlers/room.py

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# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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# Copyright 2018-2019 New Vector Ltd
# Copyright 2019 The Matrix.org Foundation C.I.C.
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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."""
import itertools
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import logging
import math
import string
from collections import OrderedDict
from typing import Tuple
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from synapse.api.constants import (
EventTypes,
JoinRules,
RoomCreationPreset,
RoomEncryptionAlgorithms,
)
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from synapse.api.errors import AuthError, Codes, NotFoundError, StoreError, SynapseError
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion
from synapse.events.utils import copy_power_levels_contents
from synapse.http.endpoint import parse_and_validate_server_name
from synapse.storage.state import StateFilter
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from synapse.types import (
Requester,
RoomAlias,
RoomID,
RoomStreamToken,
StateMap,
StreamToken,
UserID,
)
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from synapse.util import stringutils
from synapse.util.async_helpers import Linearizer
from synapse.util.caches.response_cache import ResponseCache
from synapse.visibility import filter_events_for_client
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from ._base import BaseHandler
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logger = logging.getLogger(__name__)
id_server_scheme = "https://"
FIVE_MINUTES_IN_MS = 5 * 60 * 1000
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class RoomCreationHandler(BaseHandler):
def __init__(self, hs):
super(RoomCreationHandler, self).__init__(hs)
self.spam_checker = hs.get_spam_checker()
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self.event_creation_handler = hs.get_event_creation_handler()
self.room_member_handler = hs.get_room_member_handler()
self.config = hs.config
# Room state based off defined presets
self._presets_dict = {
RoomCreationPreset.PRIVATE_CHAT: {
"join_rules": JoinRules.INVITE,
"history_visibility": "shared",
"original_invitees_have_ops": False,
"guest_can_join": True,
"power_level_content_override": {"invite": 0},
},
RoomCreationPreset.TRUSTED_PRIVATE_CHAT: {
"join_rules": JoinRules.INVITE,
"history_visibility": "shared",
"original_invitees_have_ops": True,
"guest_can_join": True,
"power_level_content_override": {"invite": 0},
},
RoomCreationPreset.PUBLIC_CHAT: {
"join_rules": JoinRules.PUBLIC,
"history_visibility": "shared",
"original_invitees_have_ops": False,
"guest_can_join": False,
"power_level_content_override": {},
},
}
# Modify presets to selectively enable encryption by default per homeserver config
for preset_name, preset_config in self._presets_dict.items():
encrypted = (
preset_name
in self.config.encryption_enabled_by_default_for_room_presets
)
preset_config["encrypted"] = encrypted
self._replication = hs.get_replication_data_handler()
# linearizer to stop two upgrades happening at once
self._upgrade_linearizer = Linearizer("room_upgrade_linearizer")
# If a user tries to update the same room multiple times in quick
# succession, only process the first attempt and return its result to
# subsequent requests
self._upgrade_response_cache = ResponseCache(
hs, "room_upgrade", timeout_ms=FIVE_MINUTES_IN_MS
)
self._server_notices_mxid = hs.config.server_notices_mxid
self.third_party_event_rules = hs.get_third_party_event_rules()
async def upgrade_room(
self, requester: Requester, old_room_id: str, new_version: RoomVersion
):
"""Replace a room with a new room with a different version
Args:
requester: the user requesting the upgrade
old_room_id: the id of the room to be replaced
new_version: the new room version to use
Returns:
Deferred[unicode]: the new room id
"""
await self.ratelimit(requester)
user_id = requester.user.to_string()
# Check if this room is already being upgraded by another person
for key in self._upgrade_response_cache.pending_result_cache:
if key[0] == old_room_id and key[1] != user_id:
# Two different people are trying to upgrade the same room.
# Send the second an error.
#
# Note that this of course only gets caught if both users are
# on the same homeserver.
raise SynapseError(
400, "An upgrade for this room is currently in progress"
)
# Upgrade the room
#
# If this user has sent multiple upgrade requests for the same room
# and one of them is not complete yet, cache the response and
# return it to all subsequent requests
ret = await self._upgrade_response_cache.wrap(
(old_room_id, user_id),
self._upgrade_room,
requester,
old_room_id,
new_version, # args for _upgrade_room
)
return ret
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async def _upgrade_room(
self, requester: Requester, old_room_id: str, new_version: RoomVersion
):
user_id = requester.user.to_string()
# start by allocating a new room id
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r = await self.store.get_room(old_room_id)
if r is None:
raise NotFoundError("Unknown room id %s" % (old_room_id,))
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new_room_id = await self._generate_room_id(
creator_id=user_id, is_public=r["is_public"], room_version=new_version,
)
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logger.info("Creating new room %s to replace %s", new_room_id, old_room_id)
# we create and auth the tombstone event before properly creating the new
# room, to check our user has perms in the old room.
(
tombstone_event,
tombstone_context,
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) = await self.event_creation_handler.create_event(
requester,
{
"type": EventTypes.Tombstone,
"state_key": "",
"room_id": old_room_id,
"sender": user_id,
"content": {
"body": "This room has been replaced",
"replacement_room": new_room_id,
},
},
token_id=requester.access_token_id,
)
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old_room_version = await self.store.get_room_version_id(old_room_id)
await self.auth.check_from_context(
old_room_version, tombstone_event, tombstone_context
)
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await self.clone_existing_room(
requester,
old_room_id=old_room_id,
new_room_id=new_room_id,
new_room_version=new_version,
tombstone_event_id=tombstone_event.event_id,
)
# now send the tombstone
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await self.event_creation_handler.send_nonmember_event(
requester, tombstone_event, tombstone_context
)
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old_room_state = await tombstone_context.get_current_state_ids()
# update any aliases
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await self._move_aliases_to_new_room(
requester, old_room_id, new_room_id, old_room_state
)
# Copy over user push rules, tags and migrate room directory state
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await self.room_member_handler.transfer_room_state_on_room_upgrade(
old_room_id, new_room_id
)
# finally, shut down the PLs in the old room, and update them in the new
# room.
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await self._update_upgraded_room_pls(
requester, old_room_id, new_room_id, old_room_state,
)
return new_room_id
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async def _update_upgraded_room_pls(
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self,
requester: Requester,
old_room_id: str,
new_room_id: str,
old_room_state: StateMap[str],
):
"""Send updated power levels in both rooms after an upgrade
Args:
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requester: the user requesting the upgrade
old_room_id: the id of the room to be replaced
new_room_id: the id of the replacement room
old_room_state: the state map for the old room
Returns:
Deferred
"""
old_room_pl_event_id = old_room_state.get((EventTypes.PowerLevels, ""))
if old_room_pl_event_id is None:
logger.warning(
"Not supported: upgrading a room with no PL event. Not setting PLs "
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"in old room."
)
return
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old_room_pl_state = await self.store.get_event(old_room_pl_event_id)
# we try to stop regular users from speaking by setting the PL required
# to send regular events and invites to 'Moderator' level. That's normally
# 50, but if the default PL in a room is 50 or more, then we set the
# required PL above that.
pl_content = dict(old_room_pl_state.content)
users_default = int(pl_content.get("users_default", 0))
restricted_level = max(users_default + 1, 50)
updated = False
for v in ("invite", "events_default"):
current = int(pl_content.get(v, 0))
if current < restricted_level:
logger.debug(
"Setting level for %s in %s to %i (was %i)",
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v,
old_room_id,
restricted_level,
current,
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)
pl_content[v] = restricted_level
updated = True
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else:
logger.debug("Not setting level for %s (already %i)", v, current)
if updated:
try:
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await self.event_creation_handler.create_and_send_nonmember_event(
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requester,
{
"type": EventTypes.PowerLevels,
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"state_key": "",
"room_id": old_room_id,
"sender": requester.user.to_string(),
"content": pl_content,
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},
ratelimit=False,
)
except AuthError as e:
logger.warning("Unable to update PLs in old room: %s", e)
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await self.event_creation_handler.create_and_send_nonmember_event(
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requester,
{
"type": EventTypes.PowerLevels,
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"state_key": "",
"room_id": new_room_id,
"sender": requester.user.to_string(),
"content": old_room_pl_state.content,
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},
ratelimit=False,
)
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async def clone_existing_room(
self,
requester: Requester,
old_room_id: str,
new_room_id: str,
new_room_version: RoomVersion,
tombstone_event_id: str,
):
"""Populate a new room based on an old room
Args:
requester: the user requesting the upgrade
old_room_id : the id of the room to be replaced
new_room_id: the id to give the new room (should already have been
created with _gemerate_room_id())
new_room_version: the new room version to use
tombstone_event_id: the ID of the tombstone event in the old room.
Returns:
Deferred
"""
user_id = requester.user.to_string()
if not self.spam_checker.user_may_create_room(user_id):
raise SynapseError(403, "You are not permitted to create rooms")
creation_content = {
"room_version": new_room_version.identifier,
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"predecessor": {"room_id": old_room_id, "event_id": tombstone_event_id},
}
# Check if old room was non-federatable
# Get old room's create event
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old_room_create_event = await self.store.get_create_event_for_room(old_room_id)
# Check if the create event specified a non-federatable room
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if not old_room_create_event.content.get("m.federate", True):
# If so, mark the new room as non-federatable as well
creation_content["m.federate"] = False
initial_state = {}
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# Replicate relevant room events
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types_to_copy = (
(EventTypes.JoinRules, ""),
(EventTypes.Name, ""),
(EventTypes.Topic, ""),
(EventTypes.RoomHistoryVisibility, ""),
(EventTypes.GuestAccess, ""),
(EventTypes.RoomAvatar, ""),
(EventTypes.RoomEncryption, ""),
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(EventTypes.ServerACL, ""),
(EventTypes.RelatedGroups, ""),
(EventTypes.PowerLevels, ""),
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)
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old_room_state_ids = await self.store.get_filtered_current_state_ids(
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old_room_id, StateFilter.from_types(types_to_copy)
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)
# map from event_id to BaseEvent
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old_room_state_events = await self.store.get_events(old_room_state_ids.values())
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for k, old_event_id in old_room_state_ids.items():
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old_event = old_room_state_events.get(old_event_id)
if old_event:
initial_state[k] = old_event.content
# deep-copy the power-levels event before we start modifying it
# note that if frozen_dicts are enabled, `power_levels` will be a frozen
# dict so we can't just copy.deepcopy it.
initial_state[
(EventTypes.PowerLevels, "")
] = power_levels = copy_power_levels_contents(
initial_state[(EventTypes.PowerLevels, "")]
)
# Resolve the minimum power level required to send any state event
# We will give the upgrading user this power level temporarily (if necessary) such that
# they are able to copy all of the state events over, then revert them back to their
# original power level afterwards in _update_upgraded_room_pls
# Copy over user power levels now as this will not be possible with >100PL users once
# the room has been created
# Calculate the minimum power level needed to clone the room
event_power_levels = power_levels.get("events", {})
state_default = power_levels.get("state_default", 0)
ban = power_levels.get("ban")
needed_power_level = max(state_default, ban, max(event_power_levels.values()))
# Raise the requester's power level in the new room if necessary
current_power_level = power_levels["users"][user_id]
if current_power_level < needed_power_level:
power_levels["users"][user_id] = needed_power_level
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await self._send_events_for_new_room(
requester,
new_room_id,
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# we expect to override all the presets with initial_state, so this is
# somewhat arbitrary.
preset_config=RoomCreationPreset.PRIVATE_CHAT,
invite_list=[],
initial_state=initial_state,
creation_content=creation_content,
)
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# Transfer membership events
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old_room_member_state_ids = await self.store.get_filtered_current_state_ids(
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old_room_id, StateFilter.from_types([(EventTypes.Member, None)])
)
# map from event_id to BaseEvent
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old_room_member_state_events = await self.store.get_events(
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old_room_member_state_ids.values()
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)
for k, old_event in old_room_member_state_events.items():
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# Only transfer ban events
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if (
"membership" in old_event.content
and old_event.content["membership"] == "ban"
):
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await self.room_member_handler.update_membership(
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requester,
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UserID.from_string(old_event["state_key"]),
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new_room_id,
"ban",
ratelimit=False,
content=old_event.content,
)
# XXX invites/joins
# XXX 3pid invites
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async def _move_aliases_to_new_room(
self,
requester: Requester,
old_room_id: str,
new_room_id: str,
old_room_state: StateMap[str],
):
# check to see if we have a canonical alias.
canonical_alias_event = None
canonical_alias_event_id = old_room_state.get((EventTypes.CanonicalAlias, ""))
if canonical_alias_event_id:
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canonical_alias_event = await self.store.get_event(canonical_alias_event_id)
await self.store.update_aliases_for_room(old_room_id, new_room_id)
if not canonical_alias_event:
return
# If there is a canonical alias we need to update the one in the old
# room and set one in the new one.
old_canonical_alias_content = dict(canonical_alias_event.content)
new_canonical_alias_content = {}
canonical = canonical_alias_event.content.get("alias")
if canonical and self.hs.is_mine_id(canonical):
new_canonical_alias_content["alias"] = canonical
old_canonical_alias_content.pop("alias", None)
# We convert to a list as it will be a Tuple.
old_alt_aliases = list(old_canonical_alias_content.get("alt_aliases", []))
if old_alt_aliases:
old_canonical_alias_content["alt_aliases"] = old_alt_aliases
new_alt_aliases = new_canonical_alias_content.setdefault("alt_aliases", [])
for alias in canonical_alias_event.content.get("alt_aliases", []):
try:
if self.hs.is_mine_id(alias):
new_alt_aliases.append(alias)
old_alt_aliases.remove(alias)
except Exception:
logger.info(
"Invalid alias %s in canonical alias event %s",
alias,
canonical_alias_event_id,
)
if not old_alt_aliases:
old_canonical_alias_content.pop("alt_aliases")
# If a canonical alias event existed for the old room, fire a canonical
# alias event for the new room with a copy of the information.
try:
await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.CanonicalAlias,
"state_key": "",
"room_id": old_room_id,
"sender": requester.user.to_string(),
"content": old_canonical_alias_content,
},
ratelimit=False,
)
except SynapseError as e:
# again I'm not really expecting this to fail, but if it does, I'd rather
# we returned the new room to the client at this point.
logger.error("Unable to send updated alias events in old room: %s", e)
try:
await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.CanonicalAlias,
"state_key": "",
"room_id": new_room_id,
"sender": requester.user.to_string(),
"content": new_canonical_alias_content,
},
ratelimit=False,
)
except SynapseError as e:
# again I'm not really expecting this to fail, but if it does, I'd rather
# we returned the new room to the client at this point.
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logger.error("Unable to send updated alias events in new room: %s", e)
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async def create_room(
self, requester, config, ratelimit=True, creator_join_profile=None
) -> Tuple[dict, int]:
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""" Creates a new room.
Args:
requester (synapse.types.Requester):
The user who requested the room creation.
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config (dict) : A dict of configuration options.
ratelimit (bool): set to False to disable the rate limiter
creator_join_profile (dict|None):
Set to override the displayname and avatar for the creating
user in this room. If unset, displayname and avatar will be
derived from the user's profile. If set, should contain the
values to go in the body of the 'join' event (typically
`avatar_url` and/or `displayname`.
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Returns:
First, a dict containing the keys `room_id` and, if an alias
was, requested, `room_alias`. Secondly, the stream_id of the
last persisted event.
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Raises:
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SynapseError if the room ID couldn't be stored, or something went
horribly wrong.
ResourceLimitError if server is blocked to some resource being
exceeded
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"""
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user_id = requester.user.to_string()
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await self.auth.check_auth_blocking(user_id)
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if (
self._server_notices_mxid is not None
and requester.user.to_string() == self._server_notices_mxid
):
# allow the server notices mxid to create rooms
is_requester_admin = True
else:
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is_requester_admin = await self.auth.is_server_admin(requester.user)
# Check whether the third party rules allows/changes the room create
# request.
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event_allowed = await self.third_party_event_rules.on_create_room(
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requester, config, is_requester_admin=is_requester_admin
)
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if not event_allowed:
raise SynapseError(
403, "You are not permitted to create rooms", Codes.FORBIDDEN
)
if not is_requester_admin and not self.spam_checker.user_may_create_room(
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user_id
):
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raise SynapseError(403, "You are not permitted to create rooms")
if ratelimit:
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await self.ratelimit(requester)
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room_version_id = config.get(
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"room_version", self.config.default_room_version.identifier
)
if not isinstance(room_version_id, str):
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raise SynapseError(400, "room_version must be a string", Codes.BAD_JSON)
room_version = KNOWN_ROOM_VERSIONS.get(room_version_id)
if room_version is None:
raise SynapseError(
400,
"Your homeserver does not support this room version",
Codes.UNSUPPORTED_ROOM_VERSION,
)
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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")
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room_alias = RoomAlias(config["room_alias_name"], self.hs.hostname)
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mapping = await self.store.get_association_from_room_alias(room_alias)
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if mapping:
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raise SynapseError(400, "Room alias already taken", Codes.ROOM_IN_USE)
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else:
room_alias = None
invite_list = config.get("invite", [])
for i in invite_list:
try:
uid = UserID.from_string(i)
parse_and_validate_server_name(uid.domain)
except Exception:
raise SynapseError(400, "Invalid user_id: %s" % (i,))
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await self.event_creation_handler.assert_accepted_privacy_policy(requester)
power_level_content_override = config.get("power_level_content_override")
if (
power_level_content_override
and "users" in power_level_content_override
and user_id not in power_level_content_override["users"]
):
raise SynapseError(
400,
"Not a valid power_level_content_override: 'users' did not contain %s"
% (user_id,),
)
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invite_3pid_list = config.get("invite_3pid", [])
visibility = config.get("visibility", None)
is_public = visibility == "public"
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room_id = await self._generate_room_id(
creator_id=user_id, is_public=is_public, room_version=room_version,
)
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directory_handler = self.hs.get_handlers().directory_handler
if room_alias:
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await directory_handler.create_association(
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requester=requester,
room_id=room_id,
room_alias=room_alias,
servers=[self.hs.hostname],
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check_membership=False,
)
if is_public:
if not self.config.is_publishing_room_allowed(user_id, room_id, room_alias):
# Lets just return a generic message, as there may be all sorts of
# reasons why we said no. TODO: Allow configurable error messages
# per alias creation rule?
raise SynapseError(403, "Not allowed to publish room")
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preset_config = config.get(
"preset",
RoomCreationPreset.PRIVATE_CHAT
if visibility == "private"
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else RoomCreationPreset.PUBLIC_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", {})
# override any attempt to set room versions via the creation_content
creation_content["room_version"] = room_version.identifier
last_stream_id = await self._send_events_for_new_room(
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requester,
room_id,
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preset_config=preset_config,
invite_list=invite_list,
initial_state=initial_state,
creation_content=creation_content,
room_alias=room_alias,
power_level_content_override=power_level_content_override,
creator_join_profile=creator_join_profile,
)
if "name" in config:
name = config["name"]
(
_,
last_stream_id,
) = await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.Name,
"room_id": room_id,
"sender": user_id,
"state_key": "",
"content": {"name": name},
},
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ratelimit=False,
)
if "topic" in config:
topic = config["topic"]
(
_,
last_stream_id,
) = await self.event_creation_handler.create_and_send_nonmember_event(
requester,
{
"type": EventTypes.Topic,
"room_id": room_id,
"sender": user_id,
"state_key": "",
"content": {"topic": topic},
},
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ratelimit=False,
)
for invitee in invite_list:
content = {}
is_direct = config.get("is_direct", None)
if is_direct:
content["is_direct"] = is_direct
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_, last_stream_id = await self.room_member_handler.update_membership(
requester,
UserID.from_string(invitee),
room_id,
"invite",
ratelimit=False,
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content=content,
)
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for invite_3pid in invite_3pid_list:
id_server = invite_3pid["id_server"]
id_access_token = invite_3pid.get("id_access_token") # optional
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address = invite_3pid["address"]
medium = invite_3pid["medium"]
last_stream_id = await self.hs.get_room_member_handler().do_3pid_invite(
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room_id,
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requester.user,
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medium,
address,
id_server,
requester,
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txn_id=None,
id_access_token=id_access_token,
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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()
# Always wait for room creation to progate before returning
await self._replication.wait_for_stream_position(
self.hs.config.worker.writers.events, "events", last_stream_id
)
return result, last_stream_id
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async def _send_events_for_new_room(
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self,
creator, # A Requester object.
room_id,
preset_config,
invite_list,
initial_state,
creation_content,
room_alias=None,
power_level_content_override=None, # Doesn't apply when initial state has power level state event content
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creator_join_profile=None,
) -> int:
"""Sends the initial events into a new room.
Returns:
The stream_id of the last event persisted.
"""
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def create(etype, content, **kwargs):
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e = {"type": etype, "content": content}
e.update(event_keys)
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e.update(kwargs)
return e
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async def send(etype, content, **kwargs) -> int:
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event = create(etype, content, **kwargs)
logger.debug("Sending %s in new room", etype)
(
_,
last_stream_id,
) = await self.event_creation_handler.create_and_send_nonmember_event(
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creator, event, ratelimit=False
)
return last_stream_id
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config = self._presets_dict[preset_config]
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creator_id = creator.user.to_string()
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event_keys = {"room_id": room_id, "sender": creator_id, "state_key": ""}
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creation_content.update({"creator": creator_id})
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await send(etype=EventTypes.Create, content=creation_content)
logger.debug("Sending %s in new room", EventTypes.Member)
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await self.room_member_handler.update_membership(
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creator,
creator.user,
room_id,
"join",
ratelimit=False,
content=creator_join_profile,
)
# We treat the power levels override specially as this needs to be one
# of the first events that get sent into a room.
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pl_content = initial_state.pop((EventTypes.PowerLevels, ""), None)
if pl_content is not None:
last_sent_stream_id = await send(
etype=EventTypes.PowerLevels, content=pl_content
)
else:
power_level_content = {
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"users": {creator_id: 100},
"users_default": 0,
"events": {
EventTypes.Name: 50,
EventTypes.PowerLevels: 100,
EventTypes.RoomHistoryVisibility: 100,
EventTypes.CanonicalAlias: 50,
EventTypes.RoomAvatar: 50,
EventTypes.Tombstone: 100,
EventTypes.ServerACL: 100,
EventTypes.RoomEncryption: 100,
},
"events_default": 0,
"state_default": 50,
"ban": 50,
"kick": 50,
"redact": 50,
"invite": 50,
}
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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 overrides are defined per chat preset
power_level_content.update(config["power_level_content_override"])
if power_level_content_override:
power_level_content.update(power_level_content_override)
last_sent_stream_id = await send(
etype=EventTypes.PowerLevels, content=power_level_content
)
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if room_alias and (EventTypes.CanonicalAlias, "") not in initial_state:
last_sent_stream_id = await send(
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etype=EventTypes.CanonicalAlias,
content={"alias": room_alias.to_string()},
)
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if (EventTypes.JoinRules, "") not in initial_state:
last_sent_stream_id = await send(
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etype=EventTypes.JoinRules, content={"join_rule": config["join_rules"]}
)
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if (EventTypes.RoomHistoryVisibility, "") not in initial_state:
last_sent_stream_id = await send(
etype=EventTypes.RoomHistoryVisibility,
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content={"history_visibility": config["history_visibility"]},
)
if config["guest_can_join"]:
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if (EventTypes.GuestAccess, "") not in initial_state:
last_sent_stream_id = await send(
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etype=EventTypes.GuestAccess, content={"guest_access": "can_join"}
)
for (etype, state_key), content in initial_state.items():
last_sent_stream_id = await send(
etype=etype, state_key=state_key, content=content
)
if config["encrypted"]:
last_sent_stream_id = await send(
etype=EventTypes.RoomEncryption,
state_key="",
content={"algorithm": RoomEncryptionAlgorithms.DEFAULT},
)
return last_sent_stream_id
async def _generate_room_id(
self, creator_id: str, is_public: str, room_version: RoomVersion,
):
# 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
while attempts < 5:
try:
random_string = stringutils.random_string(18)
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gen_room_id = RoomID(random_string, self.hs.hostname).to_string()
if isinstance(gen_room_id, bytes):
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gen_room_id = gen_room_id.decode("utf-8")
await self.store.store_room(
room_id=gen_room_id,
room_creator_user_id=creator_id,
is_public=is_public,
room_version=room_version,
)
return gen_room_id
except StoreError:
attempts += 1
raise StoreError(500, "Couldn't generate a room ID.")
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class RoomContextHandler(object):
def __init__(self, hs):
self.hs = hs
self.store = hs.get_datastore()
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self.storage = hs.get_storage()
self.state_store = self.storage.state
async def get_event_context(self, user, room_id, event_id, limit, event_filter):
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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).
event_filter (Filter|None): the filter to apply to the events returned
(excluding the target event_id)
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Returns:
dict, or None if the event isn't found
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"""
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before_limit = math.floor(limit / 2.0)
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after_limit = limit - before_limit
users = await self.store.get_users_in_room(room_id)
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is_peeking = user.to_string() not in users
def filter_evts(events):
return filter_events_for_client(
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self.storage, user.to_string(), events, is_peeking=is_peeking
)
event = await self.store.get_event(
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event_id, get_prev_content=True, allow_none=True
)
if not event:
return None
filtered = await filter_evts([event])
if not filtered:
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raise AuthError(403, "You don't have permission to access that event.")
results = await self.store.get_events_around(
room_id, event_id, before_limit, after_limit, event_filter
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)
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if event_filter:
results["events_before"] = event_filter.filter(results["events_before"])
results["events_after"] = event_filter.filter(results["events_after"])
results["events_before"] = await filter_evts(results["events_before"])
results["events_after"] = await filter_evts(results["events_after"])
# filter_evts can return a pruned event in case the user is allowed to see that
# there's something there but not see the content, so use the event that's in
# `filtered` rather than the event we retrieved from the datastore.
results["event"] = filtered[0]
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if results["events_after"]:
last_event_id = results["events_after"][-1].event_id
else:
last_event_id = event_id
if event_filter and event_filter.lazy_load_members():
state_filter = StateFilter.from_lazy_load_member_list(
ev.sender
for ev in itertools.chain(
results["events_before"],
(results["event"],),
results["events_after"],
)
)
else:
state_filter = StateFilter.all()
# XXX: why do we return the state as of the last event rather than the
# first? Shouldn't we be consistent with /sync?
# https://github.com/matrix-org/matrix-doc/issues/687
state = await self.state_store.get_state_for_events(
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[last_event_id], state_filter=state_filter
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)
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state_events = list(state[last_event_id].values())
if event_filter:
state_events = event_filter.filter(state_events)
results["state"] = await filter_evts(state_events)
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# We use a dummy token here as we only care about the room portion of
# the token, which we replace.
token = StreamToken.START
results["start"] = token.copy_and_replace(
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"room_key", results["start"]
).to_string()
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results["end"] = token.copy_and_replace("room_key", results["end"]).to_string()
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return results
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class RoomEventSource(object):
def __init__(self, hs):
self.store = hs.get_datastore()
async def get_new_events(
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self, user, from_key, limit, room_ids, is_guest, explicit_room_id=None
):
# We just ignore the key for now.
to_key = await self.get_current_key()
from_token = RoomStreamToken.parse(from_key)
if from_token.topological:
logger.warning("Stream has topological part!!!! %r", from_key)
from_key = "s%s" % (from_token.stream,)
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app_service = self.store.get_app_service_by_user_id(user.to_string())
if app_service:
# We no longer support AS users using /sync directly.
# See https://github.com/matrix-org/matrix-doc/issues/1144
raise NotImplementedError()
else:
room_events = await self.store.get_membership_changes_for_user(
user.to_string(), from_key, to_key
)
room_to_events = await self.store.get_room_events_stream_for_rooms(
room_ids=room_ids,
from_key=from_key,
to_key=to_key,
limit=limit or 10,
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order="ASC",
)
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
return (events, end_key)
def get_current_key(self):
return self.store.get_room_events_max_id()
def get_current_key_for_room(self, room_id):
return self.store.get_room_events_max_id(room_id)