synapse-product/synapse/handlers/user_directory.py

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# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import TYPE_CHECKING, Any, Dict, List, Optional
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import synapse.metrics
from synapse.api.constants import EventTypes, HistoryVisibility, JoinRules, Membership
from synapse.handlers.state_deltas import StateDeltasHandler
from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.storage.roommember import ProfileInfo
from synapse.types import JsonDict
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from synapse.util.metrics import Measure
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if TYPE_CHECKING:
from synapse.app.homeserver import HomeServer
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logger = logging.getLogger(__name__)
class UserDirectoryHandler(StateDeltasHandler):
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"""Handles querying of and keeping updated the user_directory.
N.B.: ASSUMES IT IS THE ONLY THING THAT MODIFIES THE USER DIRECTORY
The user directory is filled with users who this server can see are joined to a
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world_readable or publicly joinable room. We keep a database table up to date
by streaming changes of the current state and recalculating whether users should
be in the directory or not when necessary.
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"""
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
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self.store = hs.get_datastore()
self.state = hs.get_state_handler()
self.server_name = hs.hostname
self.clock = hs.get_clock()
self.notifier = hs.get_notifier()
self.is_mine_id = hs.is_mine_id
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self.update_user_directory = hs.config.update_user_directory
self.search_all_users = hs.config.user_directory_search_all_users
self.spam_checker = hs.get_spam_checker()
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# The current position in the current_state_delta stream
self.pos = None # type: Optional[int]
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# Guard to ensure we only process deltas one at a time
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self._is_processing = False
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if self.update_user_directory:
self.notifier.add_replication_callback(self.notify_new_event)
# We kick this off so that we don't have to wait for a change before
# we start populating the user directory
self.clock.call_later(0, self.notify_new_event)
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async def search_users(
self, user_id: str, search_term: str, limit: int
) -> JsonDict:
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"""Searches for users in directory
Returns:
dict of the form::
{
"limited": <bool>, # whether there were more results or not
"results": [ # Ordered by best match first
{
"user_id": <user_id>,
"display_name": <display_name>,
"avatar_url": <avatar_url>
}
]
}
"""
results = await self.store.search_user_dir(user_id, search_term, limit)
# Remove any spammy users from the results.
non_spammy_users = []
for user in results["results"]:
if not await self.spam_checker.check_username_for_spam(user):
non_spammy_users.append(user)
results["results"] = non_spammy_users
return results
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def notify_new_event(self) -> None:
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"""Called when there may be more deltas to process"""
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if not self.update_user_directory:
return
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if self._is_processing:
return
async def process():
try:
await self._unsafe_process()
finally:
self._is_processing = False
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self._is_processing = True
run_as_background_process("user_directory.notify_new_event", process)
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async def handle_local_profile_change(
self, user_id: str, profile: ProfileInfo
) -> None:
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"""Called to update index of our local user profiles when they change
irrespective of any rooms the user may be in.
"""
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# FIXME(#3714): We should probably do this in the same worker as all
# the other changes.
# Support users are for diagnostics and should not appear in the user directory.
is_support = await self.store.is_support_user(user_id)
# When change profile information of deactivated user it should not appear in the user directory.
is_deactivated = await self.store.get_user_deactivated_status(user_id)
if not (is_support or is_deactivated):
await self.store.update_profile_in_user_dir(
user_id, profile.display_name, profile.avatar_url
)
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async def handle_user_deactivated(self, user_id: str) -> None:
"""Called when a user ID is deactivated"""
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# FIXME(#3714): We should probably do this in the same worker as all
# the other changes.
await self.store.remove_from_user_dir(user_id)
async def _unsafe_process(self) -> None:
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# If self.pos is None then means we haven't fetched it from DB
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if self.pos is None:
self.pos = await self.store.get_user_directory_stream_pos()
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# If still None then the initial background update hasn't happened yet.
if self.pos is None:
return None
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# Loop round handling deltas until we're up to date
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while True:
with Measure(self.clock, "user_dir_delta"):
room_max_stream_ordering = self.store.get_room_max_stream_ordering()
if self.pos == room_max_stream_ordering:
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return
logger.debug(
"Processing user stats %s->%s", self.pos, room_max_stream_ordering
)
max_pos, deltas = await self.store.get_current_state_deltas(
self.pos, room_max_stream_ordering
)
logger.debug("Handling %d state deltas", len(deltas))
await self._handle_deltas(deltas)
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self.pos = max_pos
# Expose current event processing position to prometheus
synapse.metrics.event_processing_positions.labels("user_dir").set(
max_pos
)
await self.store.update_user_directory_stream_pos(max_pos)
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async def _handle_deltas(self, deltas: List[Dict[str, Any]]) -> None:
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"""Called with the state deltas to process"""
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for delta in deltas:
typ = delta["type"]
state_key = delta["state_key"]
room_id = delta["room_id"]
event_id = delta["event_id"]
prev_event_id = delta["prev_event_id"]
logger.debug("Handling: %r %r, %s", typ, state_key, event_id)
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# For join rule and visibility changes we need to check if the room
# may have become public or not and add/remove the users in said room
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if typ in (EventTypes.RoomHistoryVisibility, EventTypes.JoinRules):
await self._handle_room_publicity_change(
room_id, prev_event_id, event_id, typ
)
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elif typ == EventTypes.Member:
change = await self._get_key_change(
prev_event_id,
event_id,
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key_name="membership",
public_value=Membership.JOIN,
)
if change is False:
# Need to check if the server left the room entirely, if so
# we might need to remove all the users in that room
is_in_room = await self.store.is_host_joined(
room_id, self.server_name
)
if not is_in_room:
logger.debug("Server left room: %r", room_id)
# Fetch all the users that we marked as being in user
# directory due to being in the room and then check if
# need to remove those users or not
user_ids = await self.store.get_users_in_dir_due_to_room(
room_id
)
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for user_id in user_ids:
await self._handle_remove_user(room_id, user_id)
return
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else:
logger.debug("Server is still in room: %r", room_id)
is_support = await self.store.is_support_user(state_key)
if not is_support:
if change is None:
# Handle any profile changes
await self._handle_profile_change(
state_key, room_id, prev_event_id, event_id
)
continue
if change: # The user joined
event = await self.store.get_event(event_id, allow_none=True)
# It isn't expected for this event to not exist, but we
# don't want the entire background process to break.
if event is None:
continue
profile = ProfileInfo(
avatar_url=event.content.get("avatar_url"),
display_name=event.content.get("displayname"),
)
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await self._handle_new_user(room_id, state_key, profile)
else: # The user left
await self._handle_remove_user(room_id, state_key)
else:
logger.debug("Ignoring irrelevant type: %r", typ)
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async def _handle_room_publicity_change(
self,
room_id: str,
prev_event_id: Optional[str],
event_id: Optional[str],
typ: str,
) -> None:
"""Handle a room having potentially changed from/to world_readable/publicly
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joinable.
Args:
room_id: The ID of the room which changed.
prev_event_id: The previous event before the state change
event_id: The new event after the state change
typ: Type of the event
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"""
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logger.debug("Handling change for %s: %s", typ, room_id)
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if typ == EventTypes.RoomHistoryVisibility:
change = await self._get_key_change(
prev_event_id,
event_id,
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key_name="history_visibility",
public_value=HistoryVisibility.WORLD_READABLE,
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)
elif typ == EventTypes.JoinRules:
change = await self._get_key_change(
prev_event_id,
event_id,
key_name="join_rule",
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public_value=JoinRules.PUBLIC,
)
else:
raise Exception("Invalid event type")
# If change is None, no change. True => become world_readable/public,
# False => was world_readable/public
if change is None:
logger.debug("No change")
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return
# There's been a change to or from being world readable.
is_public = await self.store.is_room_world_readable_or_publicly_joinable(
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room_id
)
logger.debug("Change: %r, is_public: %r", change, is_public)
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if change and not is_public:
# If we became world readable but room isn't currently public then
# we ignore the change
return
elif not change and is_public:
# If we stopped being world readable but are still public,
# ignore the change
return
users_with_profile = await self.state.get_current_users_in_room(room_id)
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# Remove every user from the sharing tables for that room.
for user_id in users_with_profile.keys():
await self.store.remove_user_who_share_room(user_id, room_id)
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# Then, re-add them to the tables.
# NOTE: this is not the most efficient method, as handle_new_user sets
# up local_user -> other_user and other_user_whos_local -> local_user,
# which when ran over an entire room, will result in the same values
# being added multiple times. The batching upserts shouldn't make this
# too bad, though.
for user_id, profile in users_with_profile.items():
await self._handle_new_user(room_id, user_id, profile)
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async def _handle_new_user(
self, room_id: str, user_id: str, profile: ProfileInfo
) -> None:
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"""Called when we might need to add user to directory
Args:
room_id: The room ID that user joined or started being public
user_id
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"""
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logger.debug("Adding new user to dir, %r", user_id)
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await self.store.update_profile_in_user_dir(
user_id, profile.display_name, profile.avatar_url
)
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is_public = await self.store.is_room_world_readable_or_publicly_joinable(
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room_id
)
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# Now we update users who share rooms with users.
users_with_profile = await self.state.get_current_users_in_room(room_id)
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if is_public:
await self.store.add_users_in_public_rooms(room_id, (user_id,))
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else:
to_insert = set()
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# First, if they're our user then we need to update for every user
if self.is_mine_id(user_id):
is_appservice = self.store.get_if_app_services_interested_in_user(
user_id
)
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# We don't care about appservice users.
if not is_appservice:
for other_user_id in users_with_profile:
if user_id == other_user_id:
continue
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to_insert.add((user_id, other_user_id))
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# Next we need to update for every local user in the room
for other_user_id in users_with_profile:
if user_id == other_user_id:
continue
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is_appservice = self.store.get_if_app_services_interested_in_user(
other_user_id
)
if self.is_mine_id(other_user_id) and not is_appservice:
to_insert.add((other_user_id, user_id))
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if to_insert:
await self.store.add_users_who_share_private_room(room_id, to_insert)
async def _handle_remove_user(self, room_id: str, user_id: str) -> None:
"""Called when we might need to remove user from directory
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Args:
room_id: The room ID that user left or stopped being public that
user_id
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"""
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logger.debug("Removing user %r", user_id)
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# Remove user from sharing tables
await self.store.remove_user_who_share_room(user_id, room_id)
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# Are they still in any rooms? If not, remove them entirely.
rooms_user_is_in = await self.store.get_user_dir_rooms_user_is_in(user_id)
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if len(rooms_user_is_in) == 0:
await self.store.remove_from_user_dir(user_id)
async def _handle_profile_change(
self,
user_id: str,
room_id: str,
prev_event_id: Optional[str],
event_id: Optional[str],
) -> None:
"""Check member event changes for any profile changes and update the
database if there are.
"""
if not prev_event_id or not event_id:
return
prev_event = await self.store.get_event(prev_event_id, allow_none=True)
event = await self.store.get_event(event_id, allow_none=True)
if not prev_event or not event:
return
if event.membership != Membership.JOIN:
return
prev_name = prev_event.content.get("displayname")
new_name = event.content.get("displayname")
# If the new name is an unexpected form, do not update the directory.
if not isinstance(new_name, str):
new_name = prev_name
prev_avatar = prev_event.content.get("avatar_url")
new_avatar = event.content.get("avatar_url")
# If the new avatar is an unexpected form, do not update the directory.
if not isinstance(new_avatar, str):
new_avatar = prev_avatar
if prev_name != new_name or prev_avatar != new_avatar:
await self.store.update_profile_in_user_dir(user_id, new_name, new_avatar)