diff options
Diffstat (limited to 'synapse/handlers/event_auth.py')
| -rw-r--r-- | synapse/handlers/event_auth.py | 51 |
1 files changed, 35 insertions, 16 deletions
diff --git a/synapse/handlers/event_auth.py b/synapse/handlers/event_auth.py index eff639f407..5b2fe103e7 100644 --- a/synapse/handlers/event_auth.py +++ b/synapse/handlers/event_auth.py @@ -11,10 +11,12 @@ # 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. -from typing import TYPE_CHECKING +from typing import TYPE_CHECKING, Optional -from synapse.api.constants import EventTypes, JoinRules +from synapse.api.constants import EventTypes, JoinRules, Membership +from synapse.api.errors import AuthError from synapse.api.room_versions import RoomVersion +from synapse.events import EventBase from synapse.types import StateMap if TYPE_CHECKING: @@ -29,44 +31,58 @@ class EventAuthHandler: def __init__(self, hs: "HomeServer"): self._store = hs.get_datastore() - async def can_join_without_invite( - self, state_ids: StateMap[str], room_version: RoomVersion, user_id: str - ) -> bool: + async def check_restricted_join_rules( + self, + state_ids: StateMap[str], + room_version: RoomVersion, + user_id: str, + prev_member_event: Optional[EventBase], + ) -> None: """ - Check whether a user can join a room without an invite. + Check whether a user can join a room without an invite due to restricted join rules. When joining a room with restricted joined rules (as defined in MSC3083), - the membership of spaces must be checked during join. + the membership of spaces must be checked during a room join. Args: state_ids: The state of the room as it currently is. room_version: The room version of the room being joined. user_id: The user joining the room. + prev_member_event: The current membership event for this user. - Returns: - True if the user can join the room, false otherwise. + Raises: + AuthError if the user cannot join the room. """ + # If the member is invited or currently joined, then nothing to do. + if prev_member_event and ( + prev_member_event.membership in (Membership.JOIN, Membership.INVITE) + ): + return + # This only applies to room versions which support the new join rule. if not room_version.msc3083_join_rules: - return True + return # If there's no join rule, then it defaults to invite (so this doesn't apply). join_rules_event_id = state_ids.get((EventTypes.JoinRules, ""), None) if not join_rules_event_id: - return True + return # If the join rule is not restricted, this doesn't apply. join_rules_event = await self._store.get_event(join_rules_event_id) if join_rules_event.content.get("join_rule") != JoinRules.MSC3083_RESTRICTED: - return True + return # If allowed is of the wrong form, then only allow invited users. allowed_spaces = join_rules_event.content.get("allow", []) if not isinstance(allowed_spaces, list): - return False + allowed_spaces = () # Get the list of joined rooms and see if there's an overlap. - joined_rooms = await self._store.get_rooms_for_user(user_id) + if allowed_spaces: + joined_rooms = await self._store.get_rooms_for_user(user_id) + else: + joined_rooms = () # Pull out the other room IDs, invalid data gets filtered. for space in allowed_spaces: @@ -80,7 +96,10 @@ class EventAuthHandler: # The user was joined to one of the spaces specified, they can join # this room! if space_id in joined_rooms: - return True + return # The user was not in any of the required spaces. - return False + raise AuthError( + 403, + "You do not belong to any of the required spaces to join this room.", + ) |