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Fix a panic in OnIncomingMessagesRequest
(#2250)
It's possible for `GetStateEvent` to return `nil` if there was no error but the state event wasn't found. Therefore we need to be prepared for that case. This should fix #2247.
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@ -184,16 +184,18 @@ func OnIncomingMessagesRequest(
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// at least fetch the membership events for the users returned in chunk if LazyLoadMembers is set
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// at least fetch the membership events for the users returned in chunk if LazyLoadMembers is set
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state := []gomatrixserverlib.ClientEvent{}
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state := []gomatrixserverlib.ClientEvent{}
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if filter.LazyLoadMembers {
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if filter.LazyLoadMembers {
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memberShipToUser := make(map[string]*gomatrixserverlib.HeaderedEvent)
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membershipToUser := make(map[string]*gomatrixserverlib.HeaderedEvent)
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for _, evt := range clientEvents {
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for _, evt := range clientEvents {
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memberShip, err := db.GetStateEvent(req.Context(), roomID, gomatrixserverlib.MRoomMember, evt.Sender)
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membership, err := db.GetStateEvent(req.Context(), roomID, gomatrixserverlib.MRoomMember, evt.Sender)
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if err != nil {
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if err != nil {
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util.GetLogger(req.Context()).WithError(err).Error("failed to get membership event for user")
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util.GetLogger(req.Context()).WithError(err).Error("failed to get membership event for user")
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continue
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continue
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}
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}
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memberShipToUser[evt.Sender] = memberShip
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if membership != nil {
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membershipToUser[evt.Sender] = membership
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}
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}
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}
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for _, evt := range memberShipToUser {
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for _, evt := range membershipToUser {
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state = append(state, gomatrixserverlib.HeaderedToClientEvent(evt, gomatrixserverlib.FormatAll))
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state = append(state, gomatrixserverlib.HeaderedToClientEvent(evt, gomatrixserverlib.FormatAll))
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}
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}
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}
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}
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