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Reject make_join for empty rooms (#1439)

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* Sanity-check room version on RS event input

* Update gomatrixserverlib

* Reject make_join when no room members are left

* Revert some changes from wrong branch

* Distinguish between room not existing and room being abandoned on this server

* nolint
This commit is contained in:
Neil Alexander 2020-09-24 16:18:13 +01:00 • committed by GitHub
parent a6700331ce
commit 3013ade84f
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24
federationapi/routing/join.go
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@ -29,6 +29,7 @@ import (
)
// MakeJoin implements the /make_join API
// nolint:gocyclo
func MakeJoin(
httpReq *http.Request,
request *gomatrixserverlib.FederationRequest,
@ -79,6 +80,29 @@ func MakeJoin(
}
}
// Check if we think we are still joined to the room
inRoomReq := &api.QueryServerJoinedToRoomRequest{
ServerName: cfg.Matrix.ServerName,
RoomID: roomID,
}
inRoomRes := &api.QueryServerJoinedToRoomResponse{}
if err = rsAPI.QueryServerJoinedToRoom(httpReq.Context(), inRoomReq, inRoomRes); err != nil {
util.GetLogger(httpReq.Context()).WithError(err).Error("rsAPI.QueryServerJoinedToRoom failed")
return jsonerror.InternalServerError()
}
if !inRoomRes.RoomExists {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound(fmt.Sprintf("Room ID %q was not found on this server", roomID)),
}
}
if !inRoomRes.IsInRoom {
return util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound(fmt.Sprintf("Room ID %q has no remaining users on this server", roomID)),
}
}
// Try building an event for the server
builder := gomatrixserverlib.EventBuilder{
Sender: userID,