468 lines
18 KiB
Python
468 lines
18 KiB
Python
# Copyright 2014-2016 OpenMarket 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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import logging
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import random
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from typing import TYPE_CHECKING, Optional
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from synapse.api.errors import (
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AuthError,
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Codes,
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HttpResponseException,
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RequestSendFailed,
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StoreError,
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SynapseError,
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)
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from synapse.types import JsonDict, Requester, UserID, create_requester
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from synapse.util.caches.descriptors import cached
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from synapse.util.stringutils import parse_and_validate_mxc_uri
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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MAX_DISPLAYNAME_LEN = 256
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MAX_AVATAR_URL_LEN = 1000
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class ProfileHandler:
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"""Handles fetching and updating user profile information.
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ProfileHandler can be instantiated directly on workers and will
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delegate to master when necessary.
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"""
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def __init__(self, hs: "HomeServer"):
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self.store = hs.get_datastores().main
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self.clock = hs.get_clock()
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self.hs = hs
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self.federation = hs.get_federation_client()
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hs.get_federation_registry().register_query_handler(
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"profile", self.on_profile_query
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)
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self.user_directory_handler = hs.get_user_directory_handler()
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self.request_ratelimiter = hs.get_request_ratelimiter()
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self.max_avatar_size = hs.config.server.max_avatar_size
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self.allowed_avatar_mimetypes = hs.config.server.allowed_avatar_mimetypes
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self.server_name = hs.config.server.server_name
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self._third_party_rules = hs.get_third_party_event_rules()
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async def get_profile(self, user_id: str) -> JsonDict:
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target_user = UserID.from_string(user_id)
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if self.hs.is_mine(target_user):
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profileinfo = await self.store.get_profileinfo(target_user.localpart)
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if profileinfo.display_name is None:
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raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
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return {
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"displayname": profileinfo.display_name,
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"avatar_url": profileinfo.avatar_url,
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}
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else:
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try:
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result = await self.federation.make_query(
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destination=target_user.domain,
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query_type="profile",
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args={"user_id": user_id},
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ignore_backoff=True,
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)
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return result
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except RequestSendFailed as e:
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raise SynapseError(502, "Failed to fetch profile") from e
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except HttpResponseException as e:
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if e.code < 500 and e.code != 404:
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# Other codes are not allowed in c2s API
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logger.info(
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"Server replied with wrong response: %s %s", e.code, e.msg
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)
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raise SynapseError(502, "Failed to fetch profile")
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raise e.to_synapse_error()
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async def get_displayname(self, target_user: UserID) -> Optional[str]:
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if self.hs.is_mine(target_user):
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try:
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displayname = await self.store.get_profile_displayname(
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target_user.localpart
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)
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except StoreError as e:
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if e.code == 404:
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raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
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raise
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return displayname
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else:
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try:
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result = await self.federation.make_query(
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destination=target_user.domain,
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query_type="profile",
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args={"user_id": target_user.to_string(), "field": "displayname"},
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ignore_backoff=True,
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)
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except RequestSendFailed as e:
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raise SynapseError(502, "Failed to fetch profile") from e
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except HttpResponseException as e:
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raise e.to_synapse_error()
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return result.get("displayname")
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async def set_displayname(
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self,
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target_user: UserID,
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requester: Requester,
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new_displayname: str,
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by_admin: bool = False,
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deactivation: bool = False,
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) -> None:
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"""Set the displayname of a user
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Args:
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target_user: the user whose displayname is to be changed.
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requester: The user attempting to make this change.
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new_displayname: The displayname to give this user.
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by_admin: Whether this change was made by an administrator.
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deactivation: Whether this change was made while deactivating the user.
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"""
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if not self.hs.is_mine(target_user):
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raise SynapseError(400, "User is not hosted on this homeserver")
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if not by_admin and target_user != requester.user:
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raise AuthError(400, "Cannot set another user's displayname")
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if not by_admin and not self.hs.config.registration.enable_set_displayname:
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profile = await self.store.get_profileinfo(target_user.localpart)
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if profile.display_name:
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raise SynapseError(
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400,
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"Changing display name is disabled on this server",
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Codes.FORBIDDEN,
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)
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if not isinstance(new_displayname, str):
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raise SynapseError(
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400, "'displayname' must be a string", errcode=Codes.INVALID_PARAM
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)
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if len(new_displayname) > MAX_DISPLAYNAME_LEN:
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raise SynapseError(
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400, "Displayname is too long (max %i)" % (MAX_DISPLAYNAME_LEN,)
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)
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displayname_to_set: Optional[str] = new_displayname
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if new_displayname == "":
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displayname_to_set = None
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# If the admin changes the display name of a user, the requesting user cannot send
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# the join event to update the displayname in the rooms.
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# This must be done by the target user himself.
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if by_admin:
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requester = create_requester(
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target_user,
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authenticated_entity=requester.authenticated_entity,
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)
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await self.store.set_profile_displayname(
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target_user.localpart, displayname_to_set
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)
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profile = await self.store.get_profileinfo(target_user.localpart)
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await self.user_directory_handler.handle_local_profile_change(
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target_user.to_string(), profile
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)
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await self._third_party_rules.on_profile_update(
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target_user.to_string(), profile, by_admin, deactivation
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)
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await self._update_join_states(requester, target_user)
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async def get_avatar_url(self, target_user: UserID) -> Optional[str]:
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if self.hs.is_mine(target_user):
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try:
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avatar_url = await self.store.get_profile_avatar_url(
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target_user.localpart
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)
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except StoreError as e:
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if e.code == 404:
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raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
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raise
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return avatar_url
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else:
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try:
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result = await self.federation.make_query(
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destination=target_user.domain,
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query_type="profile",
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args={"user_id": target_user.to_string(), "field": "avatar_url"},
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ignore_backoff=True,
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)
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except RequestSendFailed as e:
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raise SynapseError(502, "Failed to fetch profile") from e
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except HttpResponseException as e:
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raise e.to_synapse_error()
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return result.get("avatar_url")
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async def set_avatar_url(
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self,
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target_user: UserID,
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requester: Requester,
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new_avatar_url: str,
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by_admin: bool = False,
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deactivation: bool = False,
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) -> None:
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"""Set a new avatar URL for a user.
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Args:
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target_user: the user whose avatar URL is to be changed.
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requester: The user attempting to make this change.
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new_avatar_url: The avatar URL to give this user.
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by_admin: Whether this change was made by an administrator.
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deactivation: Whether this change was made while deactivating the user.
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"""
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if not self.hs.is_mine(target_user):
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raise SynapseError(400, "User is not hosted on this homeserver")
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if not by_admin and target_user != requester.user:
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raise AuthError(400, "Cannot set another user's avatar_url")
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if not by_admin and not self.hs.config.registration.enable_set_avatar_url:
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profile = await self.store.get_profileinfo(target_user.localpart)
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if profile.avatar_url:
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raise SynapseError(
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400, "Changing avatar is disabled on this server", Codes.FORBIDDEN
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)
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if not isinstance(new_avatar_url, str):
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raise SynapseError(
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400, "'avatar_url' must be a string", errcode=Codes.INVALID_PARAM
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)
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if len(new_avatar_url) > MAX_AVATAR_URL_LEN:
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raise SynapseError(
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400, "Avatar URL is too long (max %i)" % (MAX_AVATAR_URL_LEN,)
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)
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if not await self.check_avatar_size_and_mime_type(new_avatar_url):
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raise SynapseError(403, "This avatar is not allowed", Codes.FORBIDDEN)
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avatar_url_to_set: Optional[str] = new_avatar_url
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if new_avatar_url == "":
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avatar_url_to_set = None
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# Same like set_displayname
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if by_admin:
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requester = create_requester(
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target_user, authenticated_entity=requester.authenticated_entity
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)
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await self.store.set_profile_avatar_url(
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target_user.localpart, avatar_url_to_set
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)
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profile = await self.store.get_profileinfo(target_user.localpart)
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await self.user_directory_handler.handle_local_profile_change(
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target_user.to_string(), profile
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)
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await self._third_party_rules.on_profile_update(
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target_user.to_string(), profile, by_admin, deactivation
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)
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await self._update_join_states(requester, target_user)
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@cached()
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async def check_avatar_size_and_mime_type(self, mxc: str) -> bool:
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"""Check that the size and content type of the avatar at the given MXC URI are
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within the configured limits.
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If the given `mxc` is empty, no checks are performed. (Users are always able to
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unset their avatar.)
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Args:
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mxc: The MXC URI at which the avatar can be found.
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Returns:
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A boolean indicating whether the file can be allowed to be set as an avatar.
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"""
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if mxc == "":
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return True
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if not self.max_avatar_size and not self.allowed_avatar_mimetypes:
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return True
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server_name, _, media_id = parse_and_validate_mxc_uri(mxc)
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if server_name == self.server_name:
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media_info = await self.store.get_local_media(media_id)
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else:
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media_info = await self.store.get_cached_remote_media(server_name, media_id)
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if media_info is None:
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# Both configuration options need to access the file's metadata, and
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# retrieving remote avatars just for this becomes a bit of a faff, especially
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# if e.g. the file is too big. It's also generally safe to assume most files
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# used as avatar are uploaded locally, or if the upload didn't happen as part
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# of a PUT request on /avatar_url that the file was at least previewed by the
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# user locally (and therefore downloaded to the remote media cache).
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logger.warning("Forbidding avatar change to %s: avatar not on server", mxc)
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return False
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if self.max_avatar_size:
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# Ensure avatar does not exceed max allowed avatar size
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if media_info["media_length"] > self.max_avatar_size:
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logger.warning(
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"Forbidding avatar change to %s: %d bytes is above the allowed size "
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"limit",
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mxc,
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media_info["media_length"],
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)
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return False
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if self.allowed_avatar_mimetypes:
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# Ensure the avatar's file type is allowed
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if (
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self.allowed_avatar_mimetypes
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and media_info["media_type"] not in self.allowed_avatar_mimetypes
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):
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logger.warning(
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"Forbidding avatar change to %s: mimetype %s not allowed",
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mxc,
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media_info["media_type"],
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)
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return False
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return True
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async def on_profile_query(self, args: JsonDict) -> JsonDict:
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"""Handles federation profile query requests."""
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if not self.hs.config.federation.allow_profile_lookup_over_federation:
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raise SynapseError(
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403,
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"Profile lookup over federation is disabled on this homeserver",
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Codes.FORBIDDEN,
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)
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user = UserID.from_string(args["user_id"])
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if not self.hs.is_mine(user):
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raise SynapseError(400, "User is not hosted on this homeserver")
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just_field = args.get("field", None)
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response = {}
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try:
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if just_field is None or just_field == "displayname":
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response["displayname"] = await self.store.get_profile_displayname(
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user.localpart
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)
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if just_field is None or just_field == "avatar_url":
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response["avatar_url"] = await self.store.get_profile_avatar_url(
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user.localpart
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)
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except StoreError as e:
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if e.code == 404:
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raise SynapseError(404, "Profile was not found", Codes.NOT_FOUND)
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raise
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return response
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async def _update_join_states(
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self, requester: Requester, target_user: UserID
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) -> None:
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if not self.hs.is_mine(target_user):
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return
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await self.request_ratelimiter.ratelimit(requester)
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# Do not actually update the room state for shadow-banned users.
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if requester.shadow_banned:
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# We randomly sleep a bit just to annoy the requester.
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await self.clock.sleep(random.randint(1, 10))
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return
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room_ids = await self.store.get_rooms_for_user(target_user.to_string())
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for room_id in room_ids:
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handler = self.hs.get_room_member_handler()
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try:
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# Assume the target_user isn't a guest,
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# because we don't let guests set profile or avatar data.
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await handler.update_membership(
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requester,
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target_user,
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room_id,
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"join", # We treat a profile update like a join.
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ratelimit=False, # Try to hide that these events aren't atomic.
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)
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except Exception as e:
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logger.warning(
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"Failed to update join event for room %s - %s", room_id, str(e)
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)
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async def check_profile_query_allowed(
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self, target_user: UserID, requester: Optional[UserID] = None
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) -> None:
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"""Checks whether a profile query is allowed. If the
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'require_auth_for_profile_requests' config flag is set to True and a
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'requester' is provided, the query is only allowed if the two users
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share a room.
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Args:
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target_user: The owner of the queried profile.
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requester: The user querying for the profile.
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Raises:
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SynapseError(403): The two users share no room, or ne user couldn't
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be found to be in any room the server is in, and therefore the query
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is denied.
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"""
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# Implementation of MSC1301: don't allow looking up profiles if the
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# requester isn't in the same room as the target. We expect requester to
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# be None when this function is called outside of a profile query, e.g.
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# when building a membership event. In this case, we must allow the
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# lookup.
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if (
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not self.hs.config.server.limit_profile_requests_to_users_who_share_rooms
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or not requester
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):
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return
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# Always allow the user to query their own profile.
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if target_user.to_string() == requester.to_string():
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return
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try:
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requester_rooms = await self.store.get_rooms_for_user(requester.to_string())
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target_user_rooms = await self.store.get_rooms_for_user(
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target_user.to_string()
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)
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# Check if the room lists have no elements in common.
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if requester_rooms.isdisjoint(target_user_rooms):
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raise SynapseError(403, "Profile isn't available", Codes.FORBIDDEN)
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except StoreError as e:
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if e.code == 404:
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# This likely means that one of the users doesn't exist,
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# so we act as if we couldn't find the profile.
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raise SynapseError(403, "Profile isn't available", Codes.FORBIDDEN)
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raise
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