mirror of
https://git.anonymousland.org/anonymousland/synapse.git
synced 2024-12-28 10:39:22 -05:00
695 lines
25 KiB
Python
695 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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# Copyright 2017 - 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import AuthError, Codes, SynapseError
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from synapse.crypto.event_signing import add_hashes_and_signatures
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from synapse.events.utils import serialize_event
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from synapse.events.validator import EventValidator
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from synapse.types import (
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UserID, RoomAlias, RoomStreamToken,
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)
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from synapse.util.async import run_on_reactor, ReadWriteLock, Limiter
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from synapse.util.logcontext import preserve_fn
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from synapse.util.metrics import measure_func
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from synapse.util.frozenutils import unfreeze
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from synapse.visibility import filter_events_for_client
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from ._base import BaseHandler
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from canonicaljson import encode_canonical_json
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import logging
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import random
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import ujson
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logger = logging.getLogger(__name__)
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class MessageHandler(BaseHandler):
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def __init__(self, hs):
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super(MessageHandler, self).__init__(hs)
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self.hs = hs
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self.state = hs.get_state_handler()
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self.clock = hs.get_clock()
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self.pagination_lock = ReadWriteLock()
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@defer.inlineCallbacks
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def purge_history(self, room_id, event_id, delete_local_events=False):
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event = yield self.store.get_event(event_id)
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if event.room_id != room_id:
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raise SynapseError(400, "Event is for wrong room.")
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depth = event.depth
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with (yield self.pagination_lock.write(room_id)):
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yield self.store.purge_history(room_id, depth, delete_local_events)
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@defer.inlineCallbacks
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def get_messages(self, requester, room_id=None, pagin_config=None,
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as_client_event=True, event_filter=None):
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"""Get messages in a room.
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Args:
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requester (Requester): The user requesting messages.
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room_id (str): The room they want messages from.
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pagin_config (synapse.api.streams.PaginationConfig): The pagination
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config rules to apply, if any.
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as_client_event (bool): True to get events in client-server format.
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event_filter (Filter): Filter to apply to results or None
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Returns:
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dict: Pagination API results
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"""
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user_id = requester.user.to_string()
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if pagin_config.from_token:
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room_token = pagin_config.from_token.room_key
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else:
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pagin_config.from_token = (
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yield self.hs.get_event_sources().get_current_token_for_room(
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room_id=room_id
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)
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)
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room_token = pagin_config.from_token.room_key
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room_token = RoomStreamToken.parse(room_token)
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pagin_config.from_token = pagin_config.from_token.copy_and_replace(
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"room_key", str(room_token)
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)
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source_config = pagin_config.get_source_config("room")
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with (yield self.pagination_lock.read(room_id)):
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membership, member_event_id = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if source_config.direction == 'b':
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# if we're going backwards, we might need to backfill. This
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# requires that we have a topo token.
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if room_token.topological:
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max_topo = room_token.topological
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else:
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max_topo = yield self.store.get_max_topological_token(
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room_id, room_token.stream
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)
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if membership == Membership.LEAVE:
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# If they have left the room then clamp the token to be before
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# they left the room, to save the effort of loading from the
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# database.
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leave_token = yield self.store.get_topological_token_for_event(
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member_event_id
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)
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leave_token = RoomStreamToken.parse(leave_token)
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if leave_token.topological < max_topo:
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source_config.from_key = str(leave_token)
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yield self.hs.get_handlers().federation_handler.maybe_backfill(
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room_id, max_topo
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)
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events, next_key = yield self.store.paginate_room_events(
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room_id=room_id,
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from_key=source_config.from_key,
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to_key=source_config.to_key,
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direction=source_config.direction,
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limit=source_config.limit,
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event_filter=event_filter,
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)
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next_token = pagin_config.from_token.copy_and_replace(
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"room_key", next_key
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)
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if not events:
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defer.returnValue({
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"chunk": [],
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"start": pagin_config.from_token.to_string(),
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"end": next_token.to_string(),
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})
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if event_filter:
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events = event_filter.filter(events)
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events = yield filter_events_for_client(
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self.store,
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user_id,
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events,
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is_peeking=(member_event_id is None),
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)
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time_now = self.clock.time_msec()
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chunk = {
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"chunk": [
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serialize_event(e, time_now, as_client_event)
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for e in events
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],
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"start": pagin_config.from_token.to_string(),
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"end": next_token.to_string(),
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}
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defer.returnValue(chunk)
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@defer.inlineCallbacks
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def get_room_data(self, user_id=None, room_id=None,
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event_type=None, state_key="", is_guest=False):
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""" Get data from a room.
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Args:
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event : The room path event
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Returns:
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The path data content.
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Raises:
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SynapseError if something went wrong.
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"""
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membership, membership_event_id = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if membership == Membership.JOIN:
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data = yield self.state_handler.get_current_state(
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room_id, event_type, state_key
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)
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elif membership == Membership.LEAVE:
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key = (event_type, state_key)
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room_state = yield self.store.get_state_for_events(
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[membership_event_id], [key]
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)
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data = room_state[membership_event_id].get(key)
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defer.returnValue(data)
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@defer.inlineCallbacks
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def _check_in_room_or_world_readable(self, room_id, user_id):
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try:
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# check_user_was_in_room will return the most recent membership
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# event for the user if:
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# * The user is a non-guest user, and was ever in the room
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# * The user is a guest user, and has joined the room
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# else it will throw.
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member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
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defer.returnValue((member_event.membership, member_event.event_id))
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return
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except AuthError:
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visibility = yield self.state_handler.get_current_state(
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room_id, EventTypes.RoomHistoryVisibility, ""
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)
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if (
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visibility and
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visibility.content["history_visibility"] == "world_readable"
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):
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defer.returnValue((Membership.JOIN, None))
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return
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raise AuthError(
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403, "Guest access not allowed", errcode=Codes.GUEST_ACCESS_FORBIDDEN
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)
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@defer.inlineCallbacks
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def get_state_events(self, user_id, room_id, is_guest=False):
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"""Retrieve all state events for a given room. If the user is
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joined to the room then return the current state. If the user has
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left the room return the state events from when they left.
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Args:
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user_id(str): The user requesting state events.
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room_id(str): The room ID to get all state events from.
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Returns:
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A list of dicts representing state events. [{}, {}, {}]
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"""
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membership, membership_event_id = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if membership == Membership.JOIN:
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room_state = yield self.state_handler.get_current_state(room_id)
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elif membership == Membership.LEAVE:
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room_state = yield self.store.get_state_for_events(
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[membership_event_id], None
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)
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room_state = room_state[membership_event_id]
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now = self.clock.time_msec()
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defer.returnValue(
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[serialize_event(c, now) for c in room_state.values()]
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)
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@defer.inlineCallbacks
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def get_joined_members(self, requester, room_id):
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"""Get all the joined members in the room and their profile information.
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If the user has left the room return the state events from when they left.
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Args:
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requester(Requester): The user requesting state events.
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room_id(str): The room ID to get all state events from.
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Returns:
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A dict of user_id to profile info
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"""
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user_id = requester.user.to_string()
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if not requester.app_service:
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# We check AS auth after fetching the room membership, as it
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# requires us to pull out all joined members anyway.
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membership, _ = yield self._check_in_room_or_world_readable(
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room_id, user_id
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)
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if membership != Membership.JOIN:
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raise NotImplementedError(
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"Getting joined members after leaving is not implemented"
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)
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users_with_profile = yield self.state.get_current_user_in_room(room_id)
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# If this is an AS, double check that they are allowed to see the members.
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# This can either be because the AS user is in the room or becuase there
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# is a user in the room that the AS is "interested in"
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if requester.app_service and user_id not in users_with_profile:
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for uid in users_with_profile:
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if requester.app_service.is_interested_in_user(uid):
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break
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else:
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# Loop fell through, AS has no interested users in room
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raise AuthError(403, "Appservice not in room")
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defer.returnValue({
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user_id: {
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"avatar_url": profile.avatar_url,
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"display_name": profile.display_name,
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}
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for user_id, profile in users_with_profile.iteritems()
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})
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class EventCreationHandler(object):
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def __init__(self, hs):
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self.hs = hs
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.state = hs.get_state_handler()
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self.clock = hs.get_clock()
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self.validator = EventValidator()
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self.profile_handler = hs.get_profile_handler()
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self.event_builder_factory = hs.get_event_builder_factory()
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self.server_name = hs.hostname
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self.ratelimiter = hs.get_ratelimiter()
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self.notifier = hs.get_notifier()
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# This is only used to get at ratelimit function, and maybe_kick_guest_users
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self.base_handler = BaseHandler(hs)
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self.pusher_pool = hs.get_pusherpool()
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# We arbitrarily limit concurrent event creation for a room to 5.
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# This is to stop us from diverging history *too* much.
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self.limiter = Limiter(max_count=5)
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self.action_generator = hs.get_action_generator()
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self.spam_checker = hs.get_spam_checker()
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@defer.inlineCallbacks
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def create_event(self, requester, event_dict, token_id=None, txn_id=None,
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prev_event_ids=None):
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"""
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Given a dict from a client, create a new event.
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Creates an FrozenEvent object, filling out auth_events, prev_events,
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etc.
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Adds display names to Join membership events.
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Args:
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requester
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event_dict (dict): An entire event
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token_id (str)
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txn_id (str)
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prev_event_ids (list): The prev event ids to use when creating the event
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Returns:
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Tuple of created event (FrozenEvent), Context
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"""
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builder = self.event_builder_factory.new(event_dict)
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with (yield self.limiter.queue(builder.room_id)):
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self.validator.validate_new(builder)
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if builder.type == EventTypes.Member:
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membership = builder.content.get("membership", None)
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target = UserID.from_string(builder.state_key)
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if membership in {Membership.JOIN, Membership.INVITE}:
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# If event doesn't include a display name, add one.
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profile = self.profile_handler
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content = builder.content
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try:
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if "displayname" not in content:
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content["displayname"] = yield profile.get_displayname(target)
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if "avatar_url" not in content:
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content["avatar_url"] = yield profile.get_avatar_url(target)
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except Exception as e:
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logger.info(
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"Failed to get profile information for %r: %s",
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target, e
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)
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if token_id is not None:
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builder.internal_metadata.token_id = token_id
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if txn_id is not None:
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builder.internal_metadata.txn_id = txn_id
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event, context = yield self.create_new_client_event(
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builder=builder,
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requester=requester,
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prev_event_ids=prev_event_ids,
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)
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defer.returnValue((event, context))
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@defer.inlineCallbacks
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def send_nonmember_event(self, requester, event, context, ratelimit=True):
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"""
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Persists and notifies local clients and federation of an event.
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Args:
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event (FrozenEvent) the event to send.
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context (Context) the context of the event.
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ratelimit (bool): Whether to rate limit this send.
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is_guest (bool): Whether the sender is a guest.
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"""
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if event.type == EventTypes.Member:
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raise SynapseError(
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500,
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"Tried to send member event through non-member codepath"
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)
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user = UserID.from_string(event.sender)
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assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
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if event.is_state():
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prev_state = yield self.deduplicate_state_event(event, context)
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if prev_state is not None:
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defer.returnValue(prev_state)
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yield self.handle_new_client_event(
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requester=requester,
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event=event,
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context=context,
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ratelimit=ratelimit,
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)
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if event.type == EventTypes.Message:
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presence = self.hs.get_presence_handler()
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# We don't want to block sending messages on any presence code. This
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# matters as sometimes presence code can take a while.
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preserve_fn(presence.bump_presence_active_time)(user)
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@defer.inlineCallbacks
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def deduplicate_state_event(self, event, context):
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"""
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Checks whether event is in the latest resolved state in context.
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If so, returns the version of the event in context.
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Otherwise, returns None.
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"""
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prev_event_id = context.prev_state_ids.get((event.type, event.state_key))
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prev_event = yield self.store.get_event(prev_event_id, allow_none=True)
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if not prev_event:
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return
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if prev_event and event.user_id == prev_event.user_id:
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prev_content = encode_canonical_json(prev_event.content)
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next_content = encode_canonical_json(event.content)
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if prev_content == next_content:
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defer.returnValue(prev_event)
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return
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@defer.inlineCallbacks
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def create_and_send_nonmember_event(
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self,
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requester,
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event_dict,
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ratelimit=True,
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txn_id=None
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):
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"""
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Creates an event, then sends it.
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See self.create_event and self.send_nonmember_event.
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"""
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event, context = yield self.create_event(
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requester,
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event_dict,
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token_id=requester.access_token_id,
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txn_id=txn_id
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)
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spam_error = self.spam_checker.check_event_for_spam(event)
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if spam_error:
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if not isinstance(spam_error, basestring):
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spam_error = "Spam is not permitted here"
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raise SynapseError(
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403, spam_error, Codes.FORBIDDEN
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)
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yield self.send_nonmember_event(
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requester,
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event,
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context,
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ratelimit=ratelimit,
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)
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defer.returnValue(event)
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@measure_func("create_new_client_event")
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@defer.inlineCallbacks
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def create_new_client_event(self, builder, requester=None, prev_event_ids=None):
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if prev_event_ids:
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prev_events = yield self.store.add_event_hashes(prev_event_ids)
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prev_max_depth = yield self.store.get_max_depth_of_events(prev_event_ids)
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depth = prev_max_depth + 1
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else:
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latest_ret = yield self.store.get_latest_event_ids_and_hashes_in_room(
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builder.room_id,
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)
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# We want to limit the max number of prev events we point to in our
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# new event
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if len(latest_ret) > 10:
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# Sort by reverse depth, so we point to the most recent.
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latest_ret.sort(key=lambda a: -a[2])
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new_latest_ret = latest_ret[:5]
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# We also randomly point to some of the older events, to make
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# sure that we don't completely ignore the older events.
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if latest_ret[5:]:
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sample_size = min(5, len(latest_ret[5:]))
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new_latest_ret.extend(random.sample(latest_ret[5:], sample_size))
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latest_ret = new_latest_ret
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if latest_ret:
|
|
depth = max([d for _, _, d in latest_ret]) + 1
|
|
else:
|
|
depth = 1
|
|
|
|
prev_events = [
|
|
(event_id, prev_hashes)
|
|
for event_id, prev_hashes, _ in latest_ret
|
|
]
|
|
|
|
builder.prev_events = prev_events
|
|
builder.depth = depth
|
|
|
|
context = yield self.state.compute_event_context(builder)
|
|
if requester:
|
|
context.app_service = requester.app_service
|
|
|
|
if builder.is_state():
|
|
builder.prev_state = yield self.store.add_event_hashes(
|
|
context.prev_state_events
|
|
)
|
|
|
|
yield self.auth.add_auth_events(builder, context)
|
|
|
|
signing_key = self.hs.config.signing_key[0]
|
|
add_hashes_and_signatures(
|
|
builder, self.server_name, signing_key
|
|
)
|
|
|
|
event = builder.build()
|
|
|
|
logger.debug(
|
|
"Created event %s with state: %s",
|
|
event.event_id, context.prev_state_ids,
|
|
)
|
|
|
|
defer.returnValue(
|
|
(event, context,)
|
|
)
|
|
|
|
@measure_func("handle_new_client_event")
|
|
@defer.inlineCallbacks
|
|
def handle_new_client_event(
|
|
self,
|
|
requester,
|
|
event,
|
|
context,
|
|
ratelimit=True,
|
|
extra_users=[]
|
|
):
|
|
# We now need to go and hit out to wherever we need to hit out to.
|
|
|
|
if ratelimit:
|
|
yield self.base_handler.ratelimit(requester)
|
|
|
|
try:
|
|
yield self.auth.check_from_context(event, context)
|
|
except AuthError as err:
|
|
logger.warn("Denying new event %r because %s", event, err)
|
|
raise err
|
|
|
|
# Ensure that we can round trip before trying to persist in db
|
|
try:
|
|
dump = ujson.dumps(unfreeze(event.content))
|
|
ujson.loads(dump)
|
|
except Exception:
|
|
logger.exception("Failed to encode content: %r", event.content)
|
|
raise
|
|
|
|
yield self.base_handler.maybe_kick_guest_users(event, context)
|
|
|
|
if event.type == EventTypes.CanonicalAlias:
|
|
# Check the alias is acually valid (at this time at least)
|
|
room_alias_str = event.content.get("alias", None)
|
|
if room_alias_str:
|
|
room_alias = RoomAlias.from_string(room_alias_str)
|
|
directory_handler = self.hs.get_handlers().directory_handler
|
|
mapping = yield directory_handler.get_association(room_alias)
|
|
|
|
if mapping["room_id"] != event.room_id:
|
|
raise SynapseError(
|
|
400,
|
|
"Room alias %s does not point to the room" % (
|
|
room_alias_str,
|
|
)
|
|
)
|
|
|
|
federation_handler = self.hs.get_handlers().federation_handler
|
|
|
|
if event.type == EventTypes.Member:
|
|
if event.content["membership"] == Membership.INVITE:
|
|
def is_inviter_member_event(e):
|
|
return (
|
|
e.type == EventTypes.Member and
|
|
e.sender == event.sender
|
|
)
|
|
|
|
state_to_include_ids = [
|
|
e_id
|
|
for k, e_id in context.current_state_ids.iteritems()
|
|
if k[0] in self.hs.config.room_invite_state_types
|
|
or k == (EventTypes.Member, event.sender)
|
|
]
|
|
|
|
state_to_include = yield self.store.get_events(state_to_include_ids)
|
|
|
|
event.unsigned["invite_room_state"] = [
|
|
{
|
|
"type": e.type,
|
|
"state_key": e.state_key,
|
|
"content": e.content,
|
|
"sender": e.sender,
|
|
}
|
|
for e in state_to_include.itervalues()
|
|
]
|
|
|
|
invitee = UserID.from_string(event.state_key)
|
|
if not self.hs.is_mine(invitee):
|
|
# TODO: Can we add signature from remote server in a nicer
|
|
# way? If we have been invited by a remote server, we need
|
|
# to get them to sign the event.
|
|
|
|
returned_invite = yield federation_handler.send_invite(
|
|
invitee.domain,
|
|
event,
|
|
)
|
|
|
|
event.unsigned.pop("room_state", None)
|
|
|
|
# TODO: Make sure the signatures actually are correct.
|
|
event.signatures.update(
|
|
returned_invite.signatures
|
|
)
|
|
|
|
if event.type == EventTypes.Redaction:
|
|
auth_events_ids = yield self.auth.compute_auth_events(
|
|
event, context.prev_state_ids, for_verification=True,
|
|
)
|
|
auth_events = yield self.store.get_events(auth_events_ids)
|
|
auth_events = {
|
|
(e.type, e.state_key): e for e in auth_events.values()
|
|
}
|
|
if self.auth.check_redaction(event, auth_events=auth_events):
|
|
original_event = yield self.store.get_event(
|
|
event.redacts,
|
|
check_redacted=False,
|
|
get_prev_content=False,
|
|
allow_rejected=False,
|
|
allow_none=False
|
|
)
|
|
if event.user_id != original_event.user_id:
|
|
raise AuthError(
|
|
403,
|
|
"You don't have permission to redact events"
|
|
)
|
|
|
|
if event.type == EventTypes.Create and context.prev_state_ids:
|
|
raise AuthError(
|
|
403,
|
|
"Changing the room create event is forbidden",
|
|
)
|
|
|
|
yield self.action_generator.handle_push_actions_for_event(
|
|
event, context
|
|
)
|
|
|
|
(event_stream_id, max_stream_id) = yield self.store.persist_event(
|
|
event, context=context
|
|
)
|
|
|
|
# this intentionally does not yield: we don't care about the result
|
|
# and don't need to wait for it.
|
|
preserve_fn(self.pusher_pool.on_new_notifications)(
|
|
event_stream_id, max_stream_id
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def _notify():
|
|
yield run_on_reactor()
|
|
self.notifier.on_new_room_event(
|
|
event, event_stream_id, max_stream_id,
|
|
extra_users=extra_users
|
|
)
|
|
|
|
preserve_fn(_notify)()
|