Use PDU interface (#3070)

We only use it in a few places currently, enough to get things to
compile and run. We should be using it in much more places.

Similarly, in some places we cast []PDU back to []*Event, we need to not
do that. Likewise, in some places we cast PDU to *Event, we need to not
do that. For now though, hopefully this is a start.

23 files changed, 96 insertions, 77 deletions

diff --git a/clientapi/routing/sendevent.go b/clientapi/routing/sendevent.go
index 71dc6c40..0d01367d 100644
--- a/clientapi/routing/sendevent.go
+++ b/clientapi/routing/sendevent.go
@@ -317,7 +317,7 @@ func generateSendEvent(
 	for i := range queryRes.StateEvents {
 		stateEvents[i] = queryRes.StateEvents[i].Event
 	}
-	provider := gomatrixserverlib.NewAuthEvents(stateEvents)
+	provider := gomatrixserverlib.NewAuthEvents(gomatrixserverlib.ToPDUs(stateEvents))
 	if err = gomatrixserverlib.Allowed(e.Event, &provider); err != nil {
 		return nil, &util.JSONResponse{
 			Code: http.StatusForbidden,
diff --git a/cmd/resolve-state/main.go b/cmd/resolve-state/main.go
index 09c0e690..b2f4afa8 100644
--- a/cmd/resolve-state/main.go
+++ b/cmd/resolve-state/main.go
@@ -183,8 +183,8 @@ func main() {
 	var resolved Events
 	resolved, err = gomatrixserverlib.ResolveConflicts(
 		gomatrixserverlib.RoomVersion(*roomVersion),
-		events,
-		authEvents,
+		gomatrixserverlib.ToPDUs(events),
+		gomatrixserverlib.ToPDUs(authEvents),
 	)
 	if err != nil {
 		panic(err)
@@ -208,7 +208,7 @@ func main() {
 	fmt.Println("Returned", count, "state events after filtering")
 }
 
-type Events []*gomatrixserverlib.Event
+type Events []gomatrixserverlib.PDU
 
 func (e Events) Len() int {
 	return len(e)
diff --git a/federationapi/internal/perform.go b/federationapi/internal/perform.go
index 8882b5c1..fccea866 100644
--- a/federationapi/internal/perform.go
+++ b/federationapi/internal/perform.go
@@ -634,13 +634,13 @@ func federatedEventProvider(
 ) gomatrixserverlib.EventProvider {
 	// A list of events that we have retried, if they were not included in
 	// the auth events supplied in the send_join.
-	retries := map[string][]*gomatrixserverlib.Event{}
+	retries := map[string][]gomatrixserverlib.PDU{}
 
 	// Define a function which we can pass to Check to retrieve missing
 	// auth events inline. This greatly increases our chances of not having
 	// to repeat the entire set of checks just for a missing event or two.
-	return func(roomVersion gomatrixserverlib.RoomVersion, eventIDs []string) ([]*gomatrixserverlib.Event, error) {
-		returning := []*gomatrixserverlib.Event{}
+	return func(roomVersion gomatrixserverlib.RoomVersion, eventIDs []string) ([]gomatrixserverlib.PDU, error) {
+		returning := []gomatrixserverlib.PDU{}
 		verImpl, err := gomatrixserverlib.GetRoomVersion(roomVersion)
 		if err != nil {
 			return nil, err
@@ -680,7 +680,7 @@ func federatedEventProvider(
 				}
 
 				// Check the signatures of the event.
-				if err := ev.VerifyEventSignatures(ctx, keyRing); err != nil {
+				if err := gomatrixserverlib.VerifyEventSignatures(ctx, ev, keyRing); err != nil {
 					return nil, fmt.Errorf("missingAuth VerifyEventSignatures: %w", err)
 				}
 
diff --git a/federationapi/routing/backfill.go b/federationapi/routing/backfill.go
index 40cb88fb..06685387 100644
--- a/federationapi/routing/backfill.go
+++ b/federationapi/routing/backfill.go
@@ -114,7 +114,7 @@ func Backfill(
 
 	eventJSONs := []json.RawMessage{}
 	for _, e := range gomatrixserverlib.ReverseTopologicalOrdering(
-		evs,
+		gomatrixserverlib.ToPDUs(evs),
 		gomatrixserverlib.TopologicalOrderByPrevEvents,
 	) {
 		eventJSONs = append(eventJSONs, e.JSON())
diff --git a/federationapi/routing/join.go b/federationapi/routing/join.go
index eee0f3d9..a6a7511c 100644
--- a/federationapi/routing/join.go
+++ b/federationapi/routing/join.go
@@ -168,7 +168,7 @@ func MakeJoin(
 		stateEvents[i] = queryRes.StateEvents[i].Event
 	}
 
-	provider := gomatrixserverlib.NewAuthEvents(stateEvents)
+	provider := gomatrixserverlib.NewAuthEvents(gomatrixserverlib.ToPDUs(stateEvents))
 	if err = gomatrixserverlib.Allowed(event.Event, &provider); err != nil {
 		return util.JSONResponse{
 			Code: http.StatusForbidden,
diff --git a/federationapi/routing/leave.go b/federationapi/routing/leave.go
index ae7617fa..c9b13b98 100644
--- a/federationapi/routing/leave.go
+++ b/federationapi/routing/leave.go
@@ -114,7 +114,7 @@ func MakeLeave(
 	for i := range queryRes.StateEvents {
 		stateEvents[i] = queryRes.StateEvents[i].Event
 	}
-	provider := gomatrixserverlib.NewAuthEvents(stateEvents)
+	provider := gomatrixserverlib.NewAuthEvents(gomatrixserverlib.ToPDUs(stateEvents))
 	if err = gomatrixserverlib.Allowed(event.Event, &provider); err != nil {
 		return util.JSONResponse{
 			Code: http.StatusForbidden,
diff --git a/go.mod b/go.mod
index 527320d2..04cd27fe 100644
--- a/go.mod
+++ b/go.mod
@@ -22,7 +22,7 @@ require (
 	github.com/matrix-org/dugong v0.0.0-20210921133753-66e6b1c67e2e
 	github.com/matrix-org/go-sqlite3-js v0.0.0-20220419092513-28aa791a1c91
 	github.com/matrix-org/gomatrix v0.0.0-20220926102614-ceba4d9f7530
-	github.com/matrix-org/gomatrixserverlib v0.0.0-20230427113737-4a73af377afe
+	github.com/matrix-org/gomatrixserverlib v0.0.0-20230427151624-793f1829f540
 	github.com/matrix-org/pinecone v0.11.1-0.20230210171230-8c3b24f2649a
 	github.com/matrix-org/util v0.0.0-20221111132719-399730281e66
 	github.com/mattn/go-sqlite3 v1.14.16
diff --git a/go.sum b/go.sum
index 077b6a0f..f18bde80 100644
--- a/go.sum
+++ b/go.sum
@@ -331,6 +331,10 @@ github.com/matrix-org/gomatrixserverlib v0.0.0-20230427083830-f2324ed2e085 h1:QR
 github.com/matrix-org/gomatrixserverlib v0.0.0-20230427083830-f2324ed2e085/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20230427113737-4a73af377afe h1:+FeGaWZCDw7w3DGZhQW3n0amZ4iW5at/ocErlOFrO58=
 github.com/matrix-org/gomatrixserverlib v0.0.0-20230427113737-4a73af377afe/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230427132341-80bb893dc05c h1:qr5H8hWq+qFQXefajLf843wnB5WhppWedWQchlqp6Tc=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230427132341-80bb893dc05c/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230427151624-793f1829f540 h1:T+8YYREEIKM7QFcmOFvh3hv1gPvN0l8LCI+goNfeMO0=
+github.com/matrix-org/gomatrixserverlib v0.0.0-20230427151624-793f1829f540/go.mod h1:7HTbSZe+CIdmeqVyFMekwD5dFU8khWQyngKATvd12FU=
 github.com/matrix-org/pinecone v0.11.1-0.20230210171230-8c3b24f2649a h1:awrPDf9LEFySxTLKYBMCiObelNx/cBuv/wzllvCCH3A=
 github.com/matrix-org/pinecone v0.11.1-0.20230210171230-8c3b24f2649a/go.mod h1:HchJX9oKMXaT2xYFs0Ha/6Zs06mxLU8k6F1ODnrGkeQ=
 github.com/matrix-org/util v0.0.0-20221111132719-399730281e66 h1:6z4KxomXSIGWqhHcfzExgkH3Z3UkIXry4ibJS4Aqz2Y=
diff --git a/internal/transactionrequest.go b/internal/transactionrequest.go
index 13bb9fa4..29107b4d 100644
--- a/internal/transactionrequest.go
+++ b/internal/transactionrequest.go
@@ -168,7 +168,7 @@ func (t *TxnReq) ProcessTransaction(ctx context.Context) (*fclient.RespSend, *ut
 			}
 			continue
 		}
-		if err = event.VerifyEventSignatures(ctx, t.keys); err != nil {
+		if err = gomatrixserverlib.VerifyEventSignatures(ctx, event, t.keys); err != nil {
 			util.GetLogger(ctx).WithError(err).Debugf("Transaction: Couldn't validate signature of event %q", event.EventID())
 			results[event.EventID()] = fclient.PDUResult{
 				Error: err.Error(),
diff --git a/roomserver/api/wrapper.go b/roomserver/api/wrapper.go
index 73feb2d3..d4606622 100644
--- a/roomserver/api/wrapper.go
+++ b/roomserver/api/wrapper.go
@@ -55,7 +55,8 @@ func SendEventWithState(
 	state gomatrixserverlib.StateResponse, event *types.HeaderedEvent,
 	origin spec.ServerName, haveEventIDs map[string]bool, async bool,
 ) error {
-	outliers := gomatrixserverlib.LineariseStateResponse(event.Version(), state)
+	outliersPDU := gomatrixserverlib.LineariseStateResponse(event.Version(), state)
+	outliers := gomatrixserverlib.TempCastToEvents(outliersPDU)
 	ires := make([]InputRoomEvent, 0, len(outliers))
 	for _, outlier := range outliers {
 		if haveEventIDs[outlier.EventID()] {
diff --git a/roomserver/internal/helpers/auth.go b/roomserver/internal/helpers/auth.go
index 0fdd6982..48e2e1cf 100644
--- a/roomserver/internal/helpers/auth.go
+++ b/roomserver/internal/helpers/auth.go
@@ -65,7 +65,9 @@ func CheckForSoftFail(
 	}
 
 	// Work out which of the state events we actually need.
-	stateNeeded := gomatrixserverlib.StateNeededForAuth([]*gomatrixserverlib.Event{event.Event})
+	stateNeeded := gomatrixserverlib.StateNeededForAuth(
+		gomatrixserverlib.ToPDUs([]*gomatrixserverlib.Event{event.Event}),
+	)
 
 	// Load the actual auth events from the database.
 	authEvents, err := loadAuthEvents(ctx, db, roomInfo, stateNeeded, authStateEntries)
@@ -98,7 +100,7 @@ func CheckAuthEvents(
 	authStateEntries = types.DeduplicateStateEntries(authStateEntries)
 
 	// Work out which of the state events we actually need.
-	stateNeeded := gomatrixserverlib.StateNeededForAuth([]*gomatrixserverlib.Event{event.Event})
+	stateNeeded := gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.PDU{event.Event})
 
 	// Load the actual auth events from the database.
 	authEvents, err := loadAuthEvents(ctx, db, roomInfo, stateNeeded, authStateEntries)
@@ -132,31 +134,31 @@ func (ae *authEvents) Valid() bool {
 }
 
 // Create implements gomatrixserverlib.AuthEventProvider
-func (ae *authEvents) Create() (*gomatrixserverlib.Event, error) {
+func (ae *authEvents) Create() (gomatrixserverlib.PDU, error) {
 	return ae.lookupEventWithEmptyStateKey(types.MRoomCreateNID), nil
 }
 
 // PowerLevels implements gomatrixserverlib.AuthEventProvider
-func (ae *authEvents) PowerLevels() (*gomatrixserverlib.Event, error) {
+func (ae *authEvents) PowerLevels() (gomatrixserverlib.PDU, error) {
 	return ae.lookupEventWithEmptyStateKey(types.MRoomPowerLevelsNID), nil
 }
 
 // JoinRules implements gomatrixserverlib.AuthEventProvider
-func (ae *authEvents) JoinRules() (*gomatrixserverlib.Event, error) {
+func (ae *authEvents) JoinRules() (gomatrixserverlib.PDU, error) {
 	return ae.lookupEventWithEmptyStateKey(types.MRoomJoinRulesNID), nil
 }
 
 // Memmber implements gomatrixserverlib.AuthEventProvider
-func (ae *authEvents) Member(stateKey string) (*gomatrixserverlib.Event, error) {
+func (ae *authEvents) Member(stateKey string) (gomatrixserverlib.PDU, error) {
 	return ae.lookupEvent(types.MRoomMemberNID, stateKey), nil
 }
 
 // ThirdPartyInvite implements gomatrixserverlib.AuthEventProvider
-func (ae *authEvents) ThirdPartyInvite(stateKey string) (*gomatrixserverlib.Event, error) {
+func (ae *authEvents) ThirdPartyInvite(stateKey string) (gomatrixserverlib.PDU, error) {
 	return ae.lookupEvent(types.MRoomThirdPartyInviteNID, stateKey), nil
 }
 
-func (ae *authEvents) lookupEventWithEmptyStateKey(typeNID types.EventTypeNID) *gomatrixserverlib.Event {
+func (ae *authEvents) lookupEventWithEmptyStateKey(typeNID types.EventTypeNID) gomatrixserverlib.PDU {
 	eventNID, ok := ae.state.lookup(types.StateKeyTuple{
 		EventTypeNID:     typeNID,
 		EventStateKeyNID: types.EmptyStateKeyNID,
@@ -171,7 +173,7 @@ func (ae *authEvents) lookupEventWithEmptyStateKey(typeNID types.EventTypeNID) *
 	return event.Event
 }
 
-func (ae *authEvents) lookupEvent(typeNID types.EventTypeNID, stateKey string) *gomatrixserverlib.Event {
+func (ae *authEvents) lookupEvent(typeNID types.EventTypeNID, stateKey string) gomatrixserverlib.PDU {
 	stateKeyNID, ok := ae.stateKeyNIDMap[stateKey]
 	if !ok {
 		return nil
diff --git a/roomserver/internal/input/input_events.go b/roomserver/internal/input/input_events.go
index 6fa7cfc2..763e4170 100644
--- a/roomserver/internal/input/input_events.go
+++ b/roomserver/internal/input/input_events.go
@@ -545,7 +545,7 @@ func (r *Inputer) processStateBefore(
 		// will include the history visibility here even though we don't
 		// actually need it for auth, because we want to send it in the
 		// output events.
-		tuplesNeeded := gomatrixserverlib.StateNeededForAuth([]*gomatrixserverlib.Event{event}).Tuples()
+		tuplesNeeded := gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.PDU{event}).Tuples()
 		tuplesNeeded = append(tuplesNeeded, gomatrixserverlib.StateKeyTuple{
 			EventType: spec.MRoomHistoryVisibility,
 			StateKey:  "",
@@ -576,7 +576,9 @@ func (r *Inputer) processStateBefore(
 	// At this point, stateBeforeEvent should be populated either by
 	// the supplied state in the input request, or from the prev events.
 	// Check whether the event is allowed or not.
-	stateBeforeAuth := gomatrixserverlib.NewAuthEvents(stateBeforeEvent)
+	stateBeforeAuth := gomatrixserverlib.NewAuthEvents(
+		gomatrixserverlib.ToPDUs(stateBeforeEvent),
+	)
 	if rejectionErr = gomatrixserverlib.Allowed(event, &stateBeforeAuth); rejectionErr != nil {
 		rejectionErr = fmt.Errorf("Allowed() failed for stateBeforeEvent: %w", rejectionErr)
 		return
@@ -675,7 +677,7 @@ func (r *Inputer) fetchAuthEvents(
 	isRejected := false
 nextAuthEvent:
 	for _, authEvent := range gomatrixserverlib.ReverseTopologicalOrdering(
-		res.AuthEvents.UntrustedEvents(event.Version()),
+		gomatrixserverlib.ToPDUs(res.AuthEvents.UntrustedEvents(event.Version())),
 		gomatrixserverlib.TopologicalOrderByAuthEvents,
 	) {
 		// If we already know about this event from the database then we don't
@@ -688,7 +690,7 @@ nextAuthEvent:
 		// Check the signatures of the event. If this fails then we'll simply
 		// skip it, because gomatrixserverlib.Allowed() will notice a problem
 		// if a critical event is missing anyway.
-		if err := authEvent.VerifyEventSignatures(ctx, r.FSAPI.KeyRing()); err != nil {
+		if err := gomatrixserverlib.VerifyEventSignatures(ctx, authEvent, r.FSAPI.KeyRing()); err != nil {
 			continue nextAuthEvent
 		}
 
@@ -743,7 +745,7 @@ nextAuthEvent:
 		// Now we know about this event, it was stored and the signatures were OK.
 		known[authEvent.EventID()] = &types.Event{
 			EventNID: eventNID,
-			Event:    authEvent,
+			Event:    authEvent.(*gomatrixserverlib.Event),
 		}
 	}
 
diff --git a/roomserver/internal/input/input_missing.go b/roomserver/internal/input/input_missing.go
index b56b2418..6847509b 100644
--- a/roomserver/internal/input/input_missing.go
+++ b/roomserver/internal/input/input_missing.go
@@ -26,7 +26,7 @@ type parsedRespState struct {
 	StateEvents []*gomatrixserverlib.Event
 }
 
-func (p *parsedRespState) Events() []*gomatrixserverlib.Event {
+func (p *parsedRespState) Events() []gomatrixserverlib.PDU {
 	eventsByID := make(map[string]*gomatrixserverlib.Event, len(p.AuthEvents)+len(p.StateEvents))
 	for i, event := range p.AuthEvents {
 		eventsByID[event.EventID()] = p.AuthEvents[i]
@@ -38,7 +38,8 @@ func (p *parsedRespState) Events() []*gomatrixserverlib.Event {
 	for _, event := range eventsByID {
 		allEvents = append(allEvents, event)
 	}
-	return gomatrixserverlib.ReverseTopologicalOrdering(allEvents, gomatrixserverlib.TopologicalOrderByAuthEvents)
+	return gomatrixserverlib.ReverseTopologicalOrdering(
+		gomatrixserverlib.ToPDUs(allEvents), gomatrixserverlib.TopologicalOrderByAuthEvents)
 }
 
 type missingStateReq struct {
@@ -155,7 +156,7 @@ func (t *missingStateReq) processEventWithMissingState(
 			}
 			outlierRoomEvents = append(outlierRoomEvents, api.InputRoomEvent{
 				Kind:   api.KindOutlier,
-				Event:  &types.HeaderedEvent{Event: outlier},
+				Event:  &types.HeaderedEvent{Event: outlier.(*gomatrixserverlib.Event)},
 				Origin: t.origin,
 			})
 		}
@@ -468,7 +469,9 @@ func (t *missingStateReq) resolveStatesAndCheck(ctx context.Context, roomVersion
 		authEventList = append(authEventList, state.AuthEvents...)
 		stateEventList = append(stateEventList, state.StateEvents...)
 	}
-	resolvedStateEvents, err := gomatrixserverlib.ResolveConflicts(roomVersion, stateEventList, authEventList)
+	resolvedStateEvents, err := gomatrixserverlib.ResolveConflicts(
+		roomVersion, gomatrixserverlib.ToPDUs(stateEventList), gomatrixserverlib.ToPDUs(authEventList),
+	)
 	if err != nil {
 		return nil, err
 	}
@@ -482,7 +485,7 @@ retryAllowedState:
 			case verifySigError:
 				return &parsedRespState{
 					AuthEvents:  authEventList,
-					StateEvents: resolvedStateEvents,
+					StateEvents: gomatrixserverlib.TempCastToEvents(resolvedStateEvents),
 				}, nil
 			case nil:
 				// do nothing
@@ -498,7 +501,7 @@ retryAllowedState:
 	}
 	return &parsedRespState{
 		AuthEvents:  authEventList,
-		StateEvents: resolvedStateEvents,
+		StateEvents: gomatrixserverlib.TempCastToEvents(resolvedStateEvents),
 	}, nil
 }
 
@@ -559,7 +562,7 @@ func (t *missingStateReq) getMissingEvents(ctx context.Context, e *gomatrixserve
 	// will be added and duplicates will be removed.
 	missingEvents := make([]*gomatrixserverlib.Event, 0, len(missingResp.Events))
 	for _, ev := range missingResp.Events.UntrustedEvents(roomVersion) {
-		if err = ev.VerifyEventSignatures(ctx, t.keys); err != nil {
+		if err = gomatrixserverlib.VerifyEventSignatures(ctx, ev, t.keys); err != nil {
 			continue
 		}
 		missingEvents = append(missingEvents, t.cacheAndReturn(ev))
@@ -567,7 +570,9 @@ func (t *missingStateReq) getMissingEvents(ctx context.Context, e *gomatrixserve
 	logger.Debugf("get_missing_events returned %d events (%d passed signature checks)", len(missingResp.Events), len(missingEvents))
 
 	// topologically sort and sanity check that we are making forward progress
-	newEvents = gomatrixserverlib.ReverseTopologicalOrdering(missingEvents, gomatrixserverlib.TopologicalOrderByPrevEvents)
+	newEventsPDUs := gomatrixserverlib.ReverseTopologicalOrdering(
+		gomatrixserverlib.ToPDUs(missingEvents), gomatrixserverlib.TopologicalOrderByPrevEvents)
+	newEvents = gomatrixserverlib.TempCastToEvents(newEventsPDUs)
 	shouldHaveSomeEventIDs := e.PrevEventIDs()
 	hasPrevEvent := false
 Event:
@@ -882,14 +887,14 @@ func (t *missingStateReq) lookupEvent(ctx context.Context, roomVersion gomatrixs
 		t.log.WithField("missing_event_id", missingEventID).Warnf("Failed to get missing /event for event ID from %d server(s)", len(t.servers))
 		return nil, fmt.Errorf("wasn't able to find event via %d server(s)", len(t.servers))
 	}
-	if err := event.VerifyEventSignatures(ctx, t.keys); err != nil {
+	if err := gomatrixserverlib.VerifyEventSignatures(ctx, event, t.keys); err != nil {
 		t.log.WithError(err).Warnf("Couldn't validate signature of event %q from /event", event.EventID())
 		return nil, verifySigError{event.EventID(), err}
 	}
 	return t.cacheAndReturn(event), nil
 }
 
-func checkAllowedByState(e *gomatrixserverlib.Event, stateEvents []*gomatrixserverlib.Event) error {
+func checkAllowedByState(e *gomatrixserverlib.Event, stateEvents []gomatrixserverlib.PDU) error {
 	authUsingState := gomatrixserverlib.NewAuthEvents(nil)
 	for i := range stateEvents {
 		err := authUsingState.AddEvent(stateEvents[i])
diff --git a/roomserver/internal/perform/perform_admin.go b/roomserver/internal/perform/perform_admin.go
index 2d96721e..e08f3d61 100644
--- a/roomserver/internal/perform/perform_admin.go
+++ b/roomserver/internal/perform/perform_admin.go
@@ -334,13 +334,13 @@ func (r *Admin) PerformAdminDownloadState(
 			return nil
 		}
 		for _, authEvent := range state.GetAuthEvents().UntrustedEvents(roomInfo.RoomVersion) {
-			if err = authEvent.VerifyEventSignatures(ctx, r.Inputer.KeyRing); err != nil {
+			if err = gomatrixserverlib.VerifyEventSignatures(ctx, authEvent, r.Inputer.KeyRing); err != nil {
 				continue
 			}
 			authEventMap[authEvent.EventID()] = authEvent
 		}
 		for _, stateEvent := range state.GetStateEvents().UntrustedEvents(roomInfo.RoomVersion) {
-			if err = stateEvent.VerifyEventSignatures(ctx, r.Inputer.KeyRing); err != nil {
+			if err = gomatrixserverlib.VerifyEventSignatures(ctx, stateEvent, r.Inputer.KeyRing); err != nil {
 				continue
 			}
 			stateEventMap[stateEvent.EventID()] = stateEvent
diff --git a/roomserver/internal/perform/perform_backfill.go b/roomserver/internal/perform/perform_backfill.go
index 6b250150..daaf5878 100644
--- a/roomserver/internal/perform/perform_backfill.go
+++ b/roomserver/internal/perform/perform_backfill.go
@@ -133,7 +133,7 @@ func (r *Backfiller) backfillViaFederation(ctx context.Context, req *api.Perform
 	logrus.WithError(err).WithField("room_id", req.RoomID).Infof("backfilled %d events", len(events))
 
 	// persist these new events - auth checks have already been done
-	roomNID, backfilledEventMap := persistEvents(ctx, r.DB, events)
+	roomNID, backfilledEventMap := persistEvents(ctx, r.DB, gomatrixserverlib.TempCastToEvents(events))
 
 	for _, ev := range backfilledEventMap {
 		// now add state for these events
@@ -170,7 +170,7 @@ func (r *Backfiller) backfillViaFederation(ctx context.Context, req *api.Perform
 
 	res.Events = make([]*types.HeaderedEvent, len(events))
 	for i := range events {
-		res.Events[i] = &types.HeaderedEvent{Event: events[i]}
+		res.Events[i] = &types.HeaderedEvent{Event: events[i].(*gomatrixserverlib.Event)}
 	}
 	res.HistoryVisibility = requester.historyVisiblity
 	return nil
@@ -230,7 +230,7 @@ func (r *Backfiller) fetchAndStoreMissingEvents(ctx context.Context, roomVer gom
 					logger.WithError(err).Warn("event failed PDU checks")
 					continue
 				}
-				missingMap[id] = &types.HeaderedEvent{Event: res.Event}
+				missingMap[id] = &types.HeaderedEvent{Event: res.Event.(*gomatrixserverlib.Event)}
 			}
 		}
 	}
@@ -257,7 +257,7 @@ type backfillRequester struct {
 	// per-request state
 	servers                 []spec.ServerName
 	eventIDToBeforeStateIDs map[string][]string
-	eventIDMap              map[string]*gomatrixserverlib.Event
+	eventIDMap              map[string]gomatrixserverlib.PDU
 	historyVisiblity        gomatrixserverlib.HistoryVisibility
 	roomInfo                types.RoomInfo
 }
@@ -278,14 +278,14 @@ func newBackfillRequester(
 		virtualHost:             virtualHost,
 		isLocalServerName:       isLocalServerName,
 		eventIDToBeforeStateIDs: make(map[string][]string),
-		eventIDMap:              make(map[string]*gomatrixserverlib.Event),
+		eventIDMap:              make(map[string]gomatrixserverlib.PDU),
 		bwExtrems:               bwExtrems,
 		preferServer:            preferServer,
 		historyVisiblity:        gomatrixserverlib.HistoryVisibilityShared,
 	}
 }
 
-func (b *backfillRequester) StateIDsBeforeEvent(ctx context.Context, targetEvent *gomatrixserverlib.Event) ([]string, error) {
+func (b *backfillRequester) StateIDsBeforeEvent(ctx context.Context, targetEvent gomatrixserverlib.PDU) ([]string, error) {
 	b.eventIDMap[targetEvent.EventID()] = targetEvent
 	if ids, ok := b.eventIDToBeforeStateIDs[targetEvent.EventID()]; ok {
 		return ids, nil
@@ -337,7 +337,7 @@ FederationHit:
 	return nil, lastErr
 }
 
-func (b *backfillRequester) calculateNewStateIDs(targetEvent, prevEvent *gomatrixserverlib.Event, prevEventStateIDs []string) []string {
+func (b *backfillRequester) calculateNewStateIDs(targetEvent, prevEvent gomatrixserverlib.PDU, prevEventStateIDs []string) []string {
 	newStateIDs := prevEventStateIDs[:]
 	if prevEvent.StateKey() == nil {
 		// state is the same as the previous event
@@ -375,7 +375,7 @@ func (b *backfillRequester) calculateNewStateIDs(targetEvent, prevEvent *gomatri
 }
 
 func (b *backfillRequester) StateBeforeEvent(ctx context.Context, roomVer gomatrixserverlib.RoomVersion,
-	event *gomatrixserverlib.Event, eventIDs []string) (map[string]*gomatrixserverlib.Event, error) {
+	event gomatrixserverlib.PDU, eventIDs []string) (map[string]gomatrixserverlib.PDU, error) {
 
 	// try to fetch the events from the database first
 	events, err := b.ProvideEvents(roomVer, eventIDs)
@@ -385,7 +385,7 @@ func (b *backfillRequester) StateBeforeEvent(ctx context.Context, roomVer gomatr
 	} else {
 		logrus.Infof("Fetched %d/%d events from the database", len(events), len(eventIDs))
 		if len(events) == len(eventIDs) {
-			result := make(map[string]*gomatrixserverlib.Event)
+			result := make(map[string]gomatrixserverlib.PDU)
 			for i := range events {
 				result[events[i].EventID()] = events[i]
 				b.eventIDMap[events[i].EventID()] = events[i]
@@ -516,7 +516,7 @@ func (b *backfillRequester) Backfill(ctx context.Context, origin, server spec.Se
 	return tx, err
 }
 
-func (b *backfillRequester) ProvideEvents(roomVer gomatrixserverlib.RoomVersion, eventIDs []string) ([]*gomatrixserverlib.Event, error) {
+func (b *backfillRequester) ProvideEvents(roomVer gomatrixserverlib.RoomVersion, eventIDs []string) ([]gomatrixserverlib.PDU, error) {
 	ctx := context.Background()
 	nidMap, err := b.db.EventNIDs(ctx, eventIDs)
 	if err != nil {
@@ -538,7 +538,7 @@ func (b *backfillRequester) ProvideEvents(roomVer gomatrixserverlib.RoomVersion,
 		logrus.WithError(err).WithField("event_nids", eventNIDs).Error("Failed to load events")
 		return nil, err
 	}
-	events := make([]*gomatrixserverlib.Event, len(eventsWithNids))
+	events := make([]gomatrixserverlib.PDU, len(eventsWithNids))
 	for i := range eventsWithNids {
 		events[i] = eventsWithNids[i].Event
 	}
diff --git a/roomserver/internal/perform/perform_inbound_peek.go b/roomserver/internal/perform/perform_inbound_peek.go
index 19b81c64..68b82746 100644
--- a/roomserver/internal/perform/perform_inbound_peek.go
+++ b/roomserver/internal/perform/perform_inbound_peek.go
@@ -68,7 +68,7 @@ func (r *InboundPeeker) PerformInboundPeek(
 	if err != nil {
 		return err
 	}
-	var sortedLatestEvents []*gomatrixserverlib.Event
+	var sortedLatestEvents []gomatrixserverlib.PDU
 	for _, ev := range latestEvents {
 		sortedLatestEvents = append(sortedLatestEvents, ev.Event)
 	}
@@ -76,7 +76,7 @@ func (r *InboundPeeker) PerformInboundPeek(
 		sortedLatestEvents,
 		gomatrixserverlib.TopologicalOrderByPrevEvents,
 	)
-	response.LatestEvent = &types.HeaderedEvent{Event: sortedLatestEvents[0]}
+	response.LatestEvent = &types.HeaderedEvent{Event: sortedLatestEvents[0].(*gomatrixserverlib.Event)}
 
 	// XXX: do we actually need to do a state resolution here?
 	roomState := state.NewStateResolution(r.DB, info)
diff --git a/roomserver/internal/perform/perform_upgrade.go b/roomserver/internal/perform/perform_upgrade.go
index e37f0e21..bfe70354 100644
--- a/roomserver/internal/perform/perform_upgrade.go
+++ b/roomserver/internal/perform/perform_upgrade.go
@@ -642,7 +642,7 @@ func (r *Upgrader) makeHeaderedEvent(ctx context.Context, evTime time.Time, user
 	for i := range queryRes.StateEvents {
 		stateEvents[i] = queryRes.StateEvents[i].Event
 	}
-	provider := gomatrixserverlib.NewAuthEvents(stateEvents)
+	provider := gomatrixserverlib.NewAuthEvents(gomatrixserverlib.ToPDUs(stateEvents))
 	if err = gomatrixserverlib.Allowed(headeredEvent.Event, &provider); err != nil {
 		return nil, &api.PerformError{
 			Code: api.PerformErrorNotAllowed,
diff --git a/roomserver/internal/query/query.go b/roomserver/internal/query/query.go
index 052ce0a8..4bd648a9 100644
--- a/roomserver/internal/query/query.go
+++ b/roomserver/internal/query/query.go
@@ -121,10 +121,13 @@ func (r *Queryer) QueryStateAfterEvents(
 			return fmt.Errorf("getAuthChain: %w", err)
 		}
 
-		stateEvents, err = gomatrixserverlib.ResolveConflicts(info.RoomVersion, stateEvents, authEvents)
+		stateEventsPDU, err := gomatrixserverlib.ResolveConflicts(
+			info.RoomVersion, gomatrixserverlib.ToPDUs(stateEvents), gomatrixserverlib.ToPDUs(authEvents),
+		)
 		if err != nil {
 			return fmt.Errorf("state.ResolveConflictsAdhoc: %w", err)
 		}
+		stateEvents = gomatrixserverlib.TempCastToEvents(stateEventsPDU)
 	}
 
 	for _, event := range stateEvents {
@@ -585,11 +588,13 @@ func (r *Queryer) QueryStateAndAuthChain(
 	}
 
 	if request.ResolveState {
-		if stateEvents, err = gomatrixserverlib.ResolveConflicts(
-			info.RoomVersion, stateEvents, authEvents,
-		); err != nil {
-			return err
+		stateEventsPDU, err2 := gomatrixserverlib.ResolveConflicts(
+			info.RoomVersion, gomatrixserverlib.ToPDUs(stateEvents), gomatrixserverlib.ToPDUs(authEvents),
+		)
+		if err2 != nil {
+			return err2
 		}
+		stateEvents = gomatrixserverlib.TempCastToEvents(stateEventsPDU)
 	}
 
 	for _, event := range stateEvents {
diff --git a/roomserver/state/state.go b/roomserver/state/state.go
index d20877b4..d04b8f6c 100644
--- a/roomserver/state/state.go
+++ b/roomserver/state/state.go
@@ -996,7 +996,7 @@ func (v *StateResolution) resolveConflictsV2(
 	// For each conflicted event, we will add a new set of auth events. Auth
 	// events may be duplicated across these sets but that's OK.
 	authSets := make(map[string][]*gomatrixserverlib.Event, len(conflicted))
-	authEvents := make([]*gomatrixserverlib.Event, 0, estimate*3)
+	authEvents := make([]gomatrixserverlib.PDU, 0, estimate*3)
 	gotAuthEvents := make(map[string]struct{}, estimate*3)
 	knownAuthEvents := make(map[string]types.Event, estimate*3)
 
@@ -1046,7 +1046,7 @@ func (v *StateResolution) resolveConflictsV2(
 	gotAuthEvents = nil // nolint:ineffassign
 
 	// Resolve the conflicts.
-	resolvedEvents := func() []*gomatrixserverlib.Event {
+	resolvedEvents := func() []gomatrixserverlib.PDU {
 		resolvedTrace, _ := internal.StartRegion(ctx, "StateResolution.ResolveStateConflictsV2")
 		defer resolvedTrace.EndRegion()
 
@@ -1119,11 +1119,11 @@ func (v *StateResolution) stateKeyTuplesNeeded(stateKeyNIDMap map[string]types.E
 // Returns an error if there was a problem talking to the database.
 func (v *StateResolution) loadStateEvents(
 	ctx context.Context, entries []types.StateEntry,
-) ([]*gomatrixserverlib.Event, map[string]types.StateEntry, error) {
+) ([]gomatrixserverlib.PDU, map[string]types.StateEntry, error) {
 	trace, ctx := internal.StartRegion(ctx, "StateResolution.loadStateEvents")
 	defer trace.EndRegion()
 
-	result := make([]*gomatrixserverlib.Event, 0, len(entries))
+	result := make([]gomatrixserverlib.PDU, 0, len(entries))
 	eventEntries := make([]types.StateEntry, 0, len(entries))
 	eventNIDs := make(types.EventNIDs, 0, len(entries))
 	for _, entry := range entries {
@@ -1163,7 +1163,7 @@ type authEventLoader struct {
 // loadAuthEvents loads all of the auth events for a given event recursively,
 // along with a map that contains state entries for all of the auth events.
 func (l *authEventLoader) loadAuthEvents(
-	ctx context.Context, roomInfo *types.RoomInfo, event *gomatrixserverlib.Event, eventMap map[string]types.Event,
+	ctx context.Context, roomInfo *types.RoomInfo, event gomatrixserverlib.PDU, eventMap map[string]types.Event,
 ) ([]*gomatrixserverlib.Event, map[string]types.StateEntry, error) {
 	l.Lock()
 	defer l.Unlock()
diff --git a/roomserver/storage/interface.go b/roomserver/storage/interface.go
index 3915f4bb..1cf05d59 100644
--- a/roomserver/storage/interface.go
+++ b/roomserver/storage/interface.go
@@ -77,7 +77,7 @@ type Database interface {
 	SnapshotNIDFromEventID(ctx context.Context, eventID string) (types.StateSnapshotNID, error)
 	BulkSelectSnapshotsFromEventIDs(ctx context.Context, eventIDs []string) (map[types.StateSnapshotNID][]string, error)
 	// Stores a matrix room event in the database. Returns the room NID, the state snapshot or an error.
-	StoreEvent(ctx context.Context, event *gomatrixserverlib.Event, roomInfo *types.RoomInfo, eventTypeNID types.EventTypeNID, eventStateKeyNID types.EventStateKeyNID, authEventNIDs []types.EventNID, isRejected bool) (types.EventNID, types.StateAtEvent, error)
+	StoreEvent(ctx context.Context, event gomatrixserverlib.PDU, roomInfo *types.RoomInfo, eventTypeNID types.EventTypeNID, eventStateKeyNID types.EventStateKeyNID, authEventNIDs []types.EventNID, isRejected bool) (types.EventNID, types.StateAtEvent, error)
 	// Look up the state entries for a list of string event IDs
 	// Returns an error if the there is an error talking to the database
 	// Returns a types.MissingEventError if the event IDs aren't in the database.
@@ -182,7 +182,7 @@ type Database interface {
 	GetMembershipForHistoryVisibility(
 		ctx context.Context, userNID types.EventStateKeyNID, info *types.RoomInfo, eventIDs ...string,
 	) (map[string]*types.HeaderedEvent, error)
-	GetOrCreateRoomInfo(ctx context.Context, event *gomatrixserverlib.Event) (*types.RoomInfo, error)
+	GetOrCreateRoomInfo(ctx context.Context, event gomatrixserverlib.PDU) (*types.RoomInfo, error)
 	GetOrCreateEventTypeNID(ctx context.Context, eventType string) (eventTypeNID types.EventTypeNID, err error)
 	GetOrCreateEventStateKeyNID(ctx context.Context, eventStateKey *string) (types.EventStateKeyNID, error)
 	MaybeRedactEvent(
@@ -207,7 +207,7 @@ type RoomDatabase interface {
 	StateEntriesForTuples(ctx context.Context, stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple) ([]types.StateEntryList, error)
 	AddState(ctx context.Context, roomNID types.RoomNID, stateBlockNIDs []types.StateBlockNID, state []types.StateEntry) (types.StateSnapshotNID, error)
 	LatestEventIDs(ctx context.Context, roomNID types.RoomNID) ([]gomatrixserverlib.EventReference, types.StateSnapshotNID, int64, error)
-	GetOrCreateRoomInfo(ctx context.Context, event *gomatrixserverlib.Event) (*types.RoomInfo, error)
+	GetOrCreateRoomInfo(ctx context.Context, event gomatrixserverlib.PDU) (*types.RoomInfo, error)
 	GetOrCreateEventTypeNID(ctx context.Context, eventType string) (eventTypeNID types.EventTypeNID, err error)
 	GetOrCreateEventStateKeyNID(ctx context.Context, eventStateKey *string) (types.EventStateKeyNID, error)
 	GetStateEvent(ctx context.Context, roomID, evType, stateKey string) (*types.HeaderedEvent, error)
@@ -230,5 +230,5 @@ type EventDatabase interface {
 	MaybeRedactEvent(
 		ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, plResolver state.PowerLevelResolver,
 	) (*gomatrixserverlib.Event, *gomatrixserverlib.Event, error)
-	StoreEvent(ctx context.Context, event *gomatrixserverlib.Event, roomInfo *types.RoomInfo, eventTypeNID types.EventTypeNID, eventStateKeyNID types.EventStateKeyNID, authEventNIDs []types.EventNID, isRejected bool) (types.EventNID, types.StateAtEvent, error)
+	StoreEvent(ctx context.Context, event gomatrixserverlib.PDU, roomInfo *types.RoomInfo, eventTypeNID types.EventTypeNID, eventStateKeyNID types.EventStateKeyNID, authEventNIDs []types.EventNID, isRejected bool) (types.EventNID, types.StateAtEvent, error)
 }
diff --git a/roomserver/storage/shared/storage.go b/roomserver/storage/shared/storage.go
index 6dc9280c..c31302cf 100644
--- a/roomserver/storage/shared/storage.go
+++ b/roomserver/storage/shared/storage.go
@@ -658,7 +658,7 @@ func (d *Database) IsEventRejected(ctx context.Context, roomNID types.RoomNID, e
 }
 
 // GetOrCreateRoomInfo gets or creates a new RoomInfo, which is only safe to use with functions only needing a roomVersion or roomNID.
-func (d *Database) GetOrCreateRoomInfo(ctx context.Context, event *gomatrixserverlib.Event) (roomInfo *types.RoomInfo, err error) {
+func (d *Database) GetOrCreateRoomInfo(ctx context.Context, event gomatrixserverlib.PDU) (roomInfo *types.RoomInfo, err error) {
 	// Get the default room version. If the client doesn't supply a room_version
 	// then we will use our configured default to create the room.
 	// https://matrix.org/docs/spec/client_server/r0.6.0#post-matrix-client-r0-createroom
@@ -725,7 +725,7 @@ func (d *Database) GetOrCreateEventStateKeyNID(ctx context.Context, eventStateKe
 }
 
 func (d *EventDatabase) StoreEvent(
-	ctx context.Context, event *gomatrixserverlib.Event,
+	ctx context.Context, event gomatrixserverlib.PDU,
 	roomInfo *types.RoomInfo, eventTypeNID types.EventTypeNID, eventStateKeyNID types.EventStateKeyNID,
 	authEventNIDs []types.EventNID, isRejected bool,
 ) (types.EventNID, types.StateAtEvent, error) {
@@ -909,7 +909,7 @@ func (d *EventDatabase) assignStateKeyNID(
 	return eventStateKeyNID, err
 }
 
-func extractRoomVersionFromCreateEvent(event *gomatrixserverlib.Event) (
+func extractRoomVersionFromCreateEvent(event gomatrixserverlib.PDU) (
 	gomatrixserverlib.RoomVersion, error,
 ) {
 	var err error
diff --git a/setup/mscs/msc2836/msc2836.go b/setup/mscs/msc2836/msc2836.go
index b106a246..38412fa2 100644
--- a/setup/mscs/msc2836/msc2836.go
+++ b/setup/mscs/msc2836/msc2836.go
@@ -646,7 +646,7 @@ func (rc *reqCtx) getLocalEvent(roomID, eventID string) *types.HeaderedEvent {
 // into the roomserver as KindOutlier, with auth chains.
 func (rc *reqCtx) injectResponseToRoomserver(res *MSC2836EventRelationshipsResponse) {
 	var stateEvents gomatrixserverlib.EventJSONs
-	var messageEvents []*gomatrixserverlib.Event
+	var messageEvents []gomatrixserverlib.PDU
 	for _, ev := range res.ParsedEvents {
 		if ev.StateKey() != nil {
 			stateEvents = append(stateEvents, ev.JSON())
@@ -665,7 +665,7 @@ func (rc *reqCtx) injectResponseToRoomserver(res *MSC2836EventRelationshipsRespo
 	for _, outlier := range append(eventsInOrder, messageEvents...) {
 		ires = append(ires, roomserver.InputRoomEvent{
 			Kind:  roomserver.KindOutlier,
-			Event: &types.HeaderedEvent{Event: outlier},
+			Event: &types.HeaderedEvent{Event: outlier.(*gomatrixserverlib.Event)},
 		})
 	}
 	// we've got the data by this point so use a background context
diff --git a/syncapi/streams/stream_pdu.go b/syncapi/streams/stream_pdu.go
index 723dd88f..e024dfae 100644
--- a/syncapi/streams/stream_pdu.go
+++ b/syncapi/streams/stream_pdu.go
@@ -279,13 +279,13 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
 		hisVisMap[re.EventID()] = re.Visibility
 	}
 	recEvents := gomatrixserverlib.HeaderedReverseTopologicalOrdering(
-		toEvents(snapshot.StreamEventsToEvents(device, recentStreamEvents)),
+		gomatrixserverlib.ToPDUs(toEvents(snapshot.StreamEventsToEvents(device, recentStreamEvents))),
 		gomatrixserverlib.TopologicalOrderByPrevEvents,
 	)
 	recentEvents := make([]*rstypes.HeaderedEvent, len(recEvents))
 	for i := range recEvents {
 		recentEvents[i] = &rstypes.HeaderedEvent{
-			Event:      recEvents[i],
+			Event:      recEvents[i].(*gomatrixserverlib.Event),
 			Visibility: hisVisMap[recEvents[i].EventID()],
 		}
 	}
@@ -358,13 +358,13 @@ func (p *PDUStreamProvider) addRoomDeltaToResponse(
 		hisVisMap[re.EventID()] = re.Visibility
 	}
 	sEvents := gomatrixserverlib.HeaderedReverseTopologicalOrdering(
-		toEvents(removeDuplicates(delta.StateEvents, events)),
+		gomatrixserverlib.ToPDUs(toEvents(removeDuplicates(delta.StateEvents, events))),
 		gomatrixserverlib.TopologicalOrderByAuthEvents,
 	)
 	delta.StateEvents = make([]*rstypes.HeaderedEvent, len(sEvents))
 	for i := range sEvents {
 		delta.StateEvents[i] = &rstypes.HeaderedEvent{
-			Event:      sEvents[i],
+			Event:      sEvents[i].(*gomatrixserverlib.Event),
 			Visibility: hisVisMap[sEvents[i].EventID()],
 		}
 	}