87 lines
3.1 KiB
Python
87 lines
3.1 KiB
Python
# Copyright 2021 The Matrix.org Foundation C.I.C.
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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 typing import TYPE_CHECKING
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from synapse.api.constants import EventTypes, JoinRules
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from synapse.api.room_versions import RoomVersion
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from synapse.types import StateMap
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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class EventAuthHandler:
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"""
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This class contains methods for authenticating events added to room graphs.
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"""
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def __init__(self, hs: "HomeServer"):
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self._store = hs.get_datastore()
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async def can_join_without_invite(
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self, state_ids: StateMap[str], room_version: RoomVersion, user_id: str
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) -> bool:
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"""
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Check whether a user can join a room without an invite.
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When joining a room with restricted joined rules (as defined in MSC3083),
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the membership of spaces must be checked during join.
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Args:
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state_ids: The state of the room as it currently is.
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room_version: The room version of the room being joined.
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user_id: The user joining the room.
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Returns:
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True if the user can join the room, false otherwise.
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"""
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# This only applies to room versions which support the new join rule.
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if not room_version.msc3083_join_rules:
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return True
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# If there's no join rule, then it defaults to invite (so this doesn't apply).
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join_rules_event_id = state_ids.get((EventTypes.JoinRules, ""), None)
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if not join_rules_event_id:
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return True
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# If the join rule is not restricted, this doesn't apply.
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join_rules_event = await self._store.get_event(join_rules_event_id)
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if join_rules_event.content.get("join_rule") != JoinRules.MSC3083_RESTRICTED:
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return True
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# If allowed is of the wrong form, then only allow invited users.
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allowed_spaces = join_rules_event.content.get("allow", [])
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if not isinstance(allowed_spaces, list):
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return False
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# Get the list of joined rooms and see if there's an overlap.
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joined_rooms = await self._store.get_rooms_for_user(user_id)
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# Pull out the other room IDs, invalid data gets filtered.
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for space in allowed_spaces:
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if not isinstance(space, dict):
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continue
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space_id = space.get("space")
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if not isinstance(space_id, str):
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continue
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# The user was joined to one of the spaces specified, they can join
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# this room!
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if space_id in joined_rooms:
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return True
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# The user was not in any of the required spaces.
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return False
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