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Handle empty from in /messages as per MSC3567 (#3298)
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@ -135,13 +135,6 @@ func OnIncomingMessagesRequest(
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var fromStream *types.StreamingToken
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fromQuery := req.URL.Query().Get("from")
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toQuery := req.URL.Query().Get("to")
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emptyFromSupplied := fromQuery == ""
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if emptyFromSupplied {
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// NOTSPEC: We will pretend they used the latest sync token if no ?from= was provided.
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// We do this to allow clients to get messages without having to call `/sync` e.g Cerulean
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currPos := srp.Notifier.CurrentPosition()
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fromQuery = currPos.String()
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}
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// Direction to return events from.
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dir := req.URL.Query().Get("dir")
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@ -155,6 +148,23 @@ func OnIncomingMessagesRequest(
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// to have one of the two accepted values (so dir == "f" <=> !backwardOrdering).
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backwardOrdering := (dir == "b")
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emptyFromSupplied := fromQuery == ""
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if emptyFromSupplied {
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// If "from" isn't provided, it defaults to either the earliest stream
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// position (if we're going forward) or to the latest one (if we're
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// going backward).
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var from types.TopologyToken
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if backwardOrdering {
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from = types.TopologyToken{Depth: math.MaxInt64, PDUPosition: math.MaxInt64}
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} else {
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// go 1 earlier than the first event so we correctly fetch the earliest event
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// this is because Database.GetEventsInTopologicalRange is exclusive of the lower-bound.
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from = types.TopologyToken{}
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}
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fromQuery = from.String()
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}
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from, err := types.NewTopologyTokenFromString(fromQuery)
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if err != nil {
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var streamToken types.StreamingToken
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