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Fix Dendrite not backfilling on world_readable rooms (#1575) 

The previous implementation was only checking if room history was
"shared", which it wasn't for rooms where a user was invited, or world
readable rooms.
This implementation leverages the IsServerAllowed method, which already
implements the complete verification algorithm.

Signed-off-by: `Mayeul Cantan <oss+matrix@mayeul.net>`

Co-authored-by: Kegsay <kegan@matrix.org>
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Mayeul Cantan 2020-11-16 11:47:16 +01:00 committed by GitHub
parent 41c0b5acfb
commit af41fcadc4
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1 changed files with 9 additions and 6 deletions
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15
roomserver/internal/perform/perform_backfill.go
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@ -426,7 +426,7 @@ FindSuccessor:
}
// possibly return all joined servers depending on history visiblity
memberEventsFromVis, err := joinEventsFromHistoryVisibility(ctx, b.db, roomID, stateEntries)
memberEventsFromVis, err := joinEventsFromHistoryVisibility(ctx, b.db, roomID, stateEntries, b.thisServer)
if err != nil {
logrus.WithError(err).Error("ServersAtEvent: failed calculate servers from history visibility rules")
return nil
@ -501,11 +501,12 @@ func (b *backfillRequester) ProvideEvents(roomVer gomatrixserverlib.RoomVersion,
return events, nil
}
// joinEventsFromHistoryVisibility returns all CURRENTLY joined members if the provided state indicated a 'shared' history visibility.
// joinEventsFromHistoryVisibility returns all CURRENTLY joined members if our server can read the room history
// TODO: Long term we probably want a history_visibility table which stores eventNID | visibility_enum so we can just
// pull all events and then filter by that table.
func joinEventsFromHistoryVisibility(
ctx context.Context, db storage.Database, roomID string, stateEntries []types.StateEntry) ([]types.Event, error) {
ctx context.Context, db storage.Database, roomID string, stateEntries []types.StateEntry,
thisServer gomatrixserverlib.ServerName) ([]types.Event, error) {
var eventNIDs []types.EventNID
for _, entry := range stateEntries {
@ -525,9 +526,11 @@ func joinEventsFromHistoryVisibility(
for i := range stateEvents {
events[i] = stateEvents[i].Event
}
visibility := auth.HistoryVisibilityForRoom(events)
if visibility != "shared" {
logrus.Infof("ServersAtEvent history visibility not shared: %s", visibility)
// Can we see events in the room?
canSeeEvents := auth.IsServerAllowed(thisServer, true, events)
if !canSeeEvents {
logrus.Infof("ServersAtEvent history not visible to us: %s", auth.HistoryVisibilityForRoom(events))
return nil, nil
}
// get joined members