diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index efe6b4c9aa..bf1a47efb0 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -268,7 +268,8 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
target: UserID,
room_id: str,
membership: str,
- prev_event_ids: List[str],
+ allow_no_prev_events: bool = False,
+ prev_event_ids: Optional[List[str]] = None,
auth_event_ids: Optional[List[str]] = None,
txn_id: Optional[str] = None,
ratelimit: bool = True,
@@ -286,8 +287,12 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
target:
room_id:
membership:
- prev_event_ids: The event IDs to use as the prev events
+ allow_no_prev_events: Whether to allow this event to be created an empty
+ list of prev_events. Normally this is prohibited just because most
+ events should have a prev_event and we should only use this in special
+ cases like MSC2716.
+ prev_event_ids: The event IDs to use as the prev events
auth_event_ids:
The event ids to use as the auth_events for the new event.
Should normally be left as None, which will cause them to be calculated
@@ -344,6 +349,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
"membership": membership,
},
txn_id=txn_id,
+ allow_no_prev_events=allow_no_prev_events,
prev_event_ids=prev_event_ids,
auth_event_ids=auth_event_ids,
require_consent=require_consent,
@@ -446,6 +452,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
require_consent: bool = True,
outlier: bool = False,
historical: bool = False,
+ allow_no_prev_events: bool = False,
prev_event_ids: Optional[List[str]] = None,
auth_event_ids: Optional[List[str]] = None,
) -> Tuple[str, int]:
@@ -470,6 +477,10 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
historical: Indicates whether the message is being inserted
back in time around some existing events. This is used to skip
a few checks and mark the event as backfilled.
+ allow_no_prev_events: Whether to allow this event to be created an empty
+ list of prev_events. Normally this is prohibited just because most
+ events should have a prev_event and we should only use this in special
+ cases like MSC2716.
prev_event_ids: The event IDs to use as the prev events
auth_event_ids:
The event ids to use as the auth_events for the new event.
@@ -504,6 +515,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
require_consent=require_consent,
outlier=outlier,
historical=historical,
+ allow_no_prev_events=allow_no_prev_events,
prev_event_ids=prev_event_ids,
auth_event_ids=auth_event_ids,
)
@@ -525,6 +537,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
require_consent: bool = True,
outlier: bool = False,
historical: bool = False,
+ allow_no_prev_events: bool = False,
prev_event_ids: Optional[List[str]] = None,
auth_event_ids: Optional[List[str]] = None,
) -> Tuple[str, int]:
@@ -551,6 +564,10 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
historical: Indicates whether the message is being inserted
back in time around some existing events. This is used to skip
a few checks and mark the event as backfilled.
+ allow_no_prev_events: Whether to allow this event to be created an empty
+ list of prev_events. Normally this is prohibited just because most
+ events should have a prev_event and we should only use this in special
+ cases like MSC2716.
prev_event_ids: The event IDs to use as the prev events
auth_event_ids:
The event ids to use as the auth_events for the new event.
@@ -680,6 +697,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
membership=effective_membership_state,
txn_id=txn_id,
ratelimit=ratelimit,
+ allow_no_prev_events=allow_no_prev_events,
prev_event_ids=prev_event_ids,
auth_event_ids=auth_event_ids,
content=content,
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