synapse-product/synapse/handlers/profile.py
David Robertson 60453315bd
Always add local users to the user directory (#10796)
It's a simplification, but one that'll help make the user directory logic easier
to follow with the other changes upcoming. It's not strictly required for those
changes, but this will help simplify the resulting logic that listens for
`m.room.member` events and generally make the logic easier to follow.

This means the config option `search_all_users` ends up controlling the
search query only, and not the data we store. The cost of doing so is an
extra row in the `user_directory` and `user_directory_search` tables for
each local user which

- belongs to no public rooms
- belongs to no private rooms of size ≥ 2

I think the cost of this will be marginal (since they'll already have entries
 in `users` and `profiles` anyway).

As a small upside, a homeserver whose directory was built with this
change can toggle `search_all_users` without having to rebuild their
directory.

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
2021-09-21 12:02:34 +00:00

462 lines
17 KiB
Python

# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import random
from typing import TYPE_CHECKING, Optional
from synapse.api.errors import (
AuthError,
Codes,
HttpResponseException,
RequestSendFailed,
StoreError,
SynapseError,
)
from synapse.metrics.background_process_metrics import wrap_as_background_process
from synapse.types import (
JsonDict,
Requester,
UserID,
create_requester,
get_domain_from_id,
)
from ._base import BaseHandler
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
MAX_DISPLAYNAME_LEN = 256
MAX_AVATAR_URL_LEN = 1000
class ProfileHandler(BaseHandler):
"""Handles fetching and updating user profile information.
ProfileHandler can be instantiated directly on workers and will
delegate to master when necessary.
"""
PROFILE_UPDATE_MS = 60 * 1000
PROFILE_UPDATE_EVERY_MS = 24 * 60 * 60 * 1000
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.federation = hs.get_federation_client()
hs.get_federation_registry().register_query_handler(
"profile", self.on_profile_query
)
self.user_directory_handler = hs.get_user_directory_handler()
if hs.config.worker.run_background_tasks:
self.clock.looping_call(
self._update_remote_profile_cache, self.PROFILE_UPDATE_MS
)
async def get_profile(self, user_id: str) -> JsonDict:
target_user = UserID.from_string(user_id)
if self.hs.is_mine(target_user):
try:
displayname = await self.store.get_profile_displayname(
target_user.localpart
)
avatar_url = await self.store.get_profile_avatar_url(
target_user.localpart
)
except StoreError as e:
if e.code == 404:
raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
raise
return {"displayname": displayname, "avatar_url": avatar_url}
else:
try:
result = await self.federation.make_query(
destination=target_user.domain,
query_type="profile",
args={"user_id": user_id},
ignore_backoff=True,
)
return result
except RequestSendFailed as e:
raise SynapseError(502, "Failed to fetch profile") from e
except HttpResponseException as e:
if e.code < 500 and e.code != 404:
# Other codes are not allowed in c2s API
logger.info(
"Server replied with wrong response: %s %s", e.code, e.msg
)
raise SynapseError(502, "Failed to fetch profile")
raise e.to_synapse_error()
async def get_profile_from_cache(self, user_id: str) -> JsonDict:
"""Get the profile information from our local cache. If the user is
ours then the profile information will always be correct. Otherwise,
it may be out of date/missing.
"""
target_user = UserID.from_string(user_id)
if self.hs.is_mine(target_user):
try:
displayname = await self.store.get_profile_displayname(
target_user.localpart
)
avatar_url = await self.store.get_profile_avatar_url(
target_user.localpart
)
except StoreError as e:
if e.code == 404:
raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
raise
return {"displayname": displayname, "avatar_url": avatar_url}
else:
profile = await self.store.get_from_remote_profile_cache(user_id)
return profile or {}
async def get_displayname(self, target_user: UserID) -> Optional[str]:
if self.hs.is_mine(target_user):
try:
displayname = await self.store.get_profile_displayname(
target_user.localpart
)
except StoreError as e:
if e.code == 404:
raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
raise
return displayname
else:
try:
result = await self.federation.make_query(
destination=target_user.domain,
query_type="profile",
args={"user_id": target_user.to_string(), "field": "displayname"},
ignore_backoff=True,
)
except RequestSendFailed as e:
raise SynapseError(502, "Failed to fetch profile") from e
except HttpResponseException as e:
raise e.to_synapse_error()
return result.get("displayname")
async def set_displayname(
self,
target_user: UserID,
requester: Requester,
new_displayname: str,
by_admin: bool = False,
) -> None:
"""Set the displayname of a user
Args:
target_user: the user whose displayname is to be changed.
requester: The user attempting to make this change.
new_displayname: The displayname to give this user.
by_admin: Whether this change was made by an administrator.
"""
if not self.hs.is_mine(target_user):
raise SynapseError(400, "User is not hosted on this homeserver")
if not by_admin and target_user != requester.user:
raise AuthError(400, "Cannot set another user's displayname")
if not by_admin and not self.hs.config.enable_set_displayname:
profile = await self.store.get_profileinfo(target_user.localpart)
if profile.display_name:
raise SynapseError(
400,
"Changing display name is disabled on this server",
Codes.FORBIDDEN,
)
if not isinstance(new_displayname, str):
raise SynapseError(
400, "'displayname' must be a string", errcode=Codes.INVALID_PARAM
)
if len(new_displayname) > MAX_DISPLAYNAME_LEN:
raise SynapseError(
400, "Displayname is too long (max %i)" % (MAX_DISPLAYNAME_LEN,)
)
displayname_to_set: Optional[str] = new_displayname
if new_displayname == "":
displayname_to_set = None
# If the admin changes the display name of a user, the requesting user cannot send
# the join event to update the displayname in the rooms.
# This must be done by the target user himself.
if by_admin:
requester = create_requester(
target_user,
authenticated_entity=requester.authenticated_entity,
)
await self.store.set_profile_displayname(
target_user.localpart, displayname_to_set
)
profile = await self.store.get_profileinfo(target_user.localpart)
await self.user_directory_handler.handle_local_profile_change(
target_user.to_string(), profile
)
await self._update_join_states(requester, target_user)
async def get_avatar_url(self, target_user: UserID) -> Optional[str]:
if self.hs.is_mine(target_user):
try:
avatar_url = await self.store.get_profile_avatar_url(
target_user.localpart
)
except StoreError as e:
if e.code == 404:
raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
raise
return avatar_url
else:
try:
result = await self.federation.make_query(
destination=target_user.domain,
query_type="profile",
args={"user_id": target_user.to_string(), "field": "avatar_url"},
ignore_backoff=True,
)
except RequestSendFailed as e:
raise SynapseError(502, "Failed to fetch profile") from e
except HttpResponseException as e:
raise e.to_synapse_error()
return result.get("avatar_url")
async def set_avatar_url(
self,
target_user: UserID,
requester: Requester,
new_avatar_url: str,
by_admin: bool = False,
) -> None:
"""Set a new avatar URL for a user.
Args:
target_user: the user whose avatar URL is to be changed.
requester: The user attempting to make this change.
new_avatar_url: The avatar URL to give this user.
by_admin: Whether this change was made by an administrator.
"""
if not self.hs.is_mine(target_user):
raise SynapseError(400, "User is not hosted on this homeserver")
if not by_admin and target_user != requester.user:
raise AuthError(400, "Cannot set another user's avatar_url")
if not by_admin and not self.hs.config.enable_set_avatar_url:
profile = await self.store.get_profileinfo(target_user.localpart)
if profile.avatar_url:
raise SynapseError(
400, "Changing avatar is disabled on this server", Codes.FORBIDDEN
)
if not isinstance(new_avatar_url, str):
raise SynapseError(
400, "'avatar_url' must be a string", errcode=Codes.INVALID_PARAM
)
if len(new_avatar_url) > MAX_AVATAR_URL_LEN:
raise SynapseError(
400, "Avatar URL is too long (max %i)" % (MAX_AVATAR_URL_LEN,)
)
avatar_url_to_set: Optional[str] = new_avatar_url
if new_avatar_url == "":
avatar_url_to_set = None
# Same like set_displayname
if by_admin:
requester = create_requester(
target_user, authenticated_entity=requester.authenticated_entity
)
await self.store.set_profile_avatar_url(
target_user.localpart, avatar_url_to_set
)
profile = await self.store.get_profileinfo(target_user.localpart)
await self.user_directory_handler.handle_local_profile_change(
target_user.to_string(), profile
)
await self._update_join_states(requester, target_user)
async def on_profile_query(self, args: JsonDict) -> JsonDict:
"""Handles federation profile query requests."""
if not self.hs.config.allow_profile_lookup_over_federation:
raise SynapseError(
403,
"Profile lookup over federation is disabled on this homeserver",
Codes.FORBIDDEN,
)
user = UserID.from_string(args["user_id"])
if not self.hs.is_mine(user):
raise SynapseError(400, "User is not hosted on this homeserver")
just_field = args.get("field", None)
response = {}
try:
if just_field is None or just_field == "displayname":
response["displayname"] = await self.store.get_profile_displayname(
user.localpart
)
if just_field is None or just_field == "avatar_url":
response["avatar_url"] = await self.store.get_profile_avatar_url(
user.localpart
)
except StoreError as e:
if e.code == 404:
raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
raise
return response
async def _update_join_states(
self, requester: Requester, target_user: UserID
) -> None:
if not self.hs.is_mine(target_user):
return
await self.ratelimit(requester)
# Do not actually update the room state for shadow-banned users.
if requester.shadow_banned:
# We randomly sleep a bit just to annoy the requester.
await self.clock.sleep(random.randint(1, 10))
return
room_ids = await self.store.get_rooms_for_user(target_user.to_string())
for room_id in room_ids:
handler = self.hs.get_room_member_handler()
try:
# Assume the target_user isn't a guest,
# because we don't let guests set profile or avatar data.
await handler.update_membership(
requester,
target_user,
room_id,
"join", # We treat a profile update like a join.
ratelimit=False, # Try to hide that these events aren't atomic.
)
except Exception as e:
logger.warning(
"Failed to update join event for room %s - %s", room_id, str(e)
)
async def check_profile_query_allowed(
self, target_user: UserID, requester: Optional[UserID] = None
) -> None:
"""Checks whether a profile query is allowed. If the
'require_auth_for_profile_requests' config flag is set to True and a
'requester' is provided, the query is only allowed if the two users
share a room.
Args:
target_user: The owner of the queried profile.
requester: The user querying for the profile.
Raises:
SynapseError(403): The two users share no room, or ne user couldn't
be found to be in any room the server is in, and therefore the query
is denied.
"""
# Implementation of MSC1301: don't allow looking up profiles if the
# requester isn't in the same room as the target. We expect requester to
# be None when this function is called outside of a profile query, e.g.
# when building a membership event. In this case, we must allow the
# lookup.
if (
not self.hs.config.limit_profile_requests_to_users_who_share_rooms
or not requester
):
return
# Always allow the user to query their own profile.
if target_user.to_string() == requester.to_string():
return
try:
requester_rooms = await self.store.get_rooms_for_user(requester.to_string())
target_user_rooms = await self.store.get_rooms_for_user(
target_user.to_string()
)
# Check if the room lists have no elements in common.
if requester_rooms.isdisjoint(target_user_rooms):
raise SynapseError(403, "Profile isn't available", Codes.FORBIDDEN)
except StoreError as e:
if e.code == 404:
# This likely means that one of the users doesn't exist,
# so we act as if we couldn't find the profile.
raise SynapseError(403, "Profile isn't available", Codes.FORBIDDEN)
raise
@wrap_as_background_process("Update remote profile")
async def _update_remote_profile_cache(self) -> None:
"""Called periodically to check profiles of remote users we haven't
checked in a while.
"""
entries = await self.store.get_remote_profile_cache_entries_that_expire(
last_checked=self.clock.time_msec() - self.PROFILE_UPDATE_EVERY_MS
)
for user_id, displayname, avatar_url in entries:
is_subscribed = await self.store.is_subscribed_remote_profile_for_user(
user_id
)
if not is_subscribed:
await self.store.maybe_delete_remote_profile_cache(user_id)
continue
try:
profile = await self.federation.make_query(
destination=get_domain_from_id(user_id),
query_type="profile",
args={"user_id": user_id},
ignore_backoff=True,
)
except Exception:
logger.exception("Failed to get avatar_url")
await self.store.update_remote_profile_cache(
user_id, displayname, avatar_url
)
continue
new_name = profile.get("displayname")
new_avatar = profile.get("avatar_url")
# We always hit update to update the last_check timestamp
await self.store.update_remote_profile_cache(user_id, new_name, new_avatar)