anonymousland-synapse/synapse/handlers/profile.py
Patrick Cloke 0248409bfa
Handle a display name / avatar URL not included in a federation request. (#9023)
These may be omitted if not set, but Synapse assumed they would
be in the response.
2021-01-06 07:29:03 -05:00

449 lines
17 KiB
Python

# -*- coding: utf-8 -*-
# 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.app.homeserver 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.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 = new_displayname # type: Optional[str]
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
)
if self.hs.config.user_directory_search_all_users:
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,
):
"""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,)
)
# 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, new_avatar_url)
if self.hs.config.user_directory_search_all_users:
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:
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):
"""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)