Fix synchronous invites

clientapi/routing/createroom.go

@@ -371,10 +371,7 @@ func createRoom(
 	}
 
 	// If this is a direct message then we should invite the participants.
-	fmt.Println("INVITEES:")
 	for _, invitee := range r.Invite {
-		fmt.Println("*", invitee)
-
 		// Build the invite event.
 		inviteEvent, err := buildMembershipEvent(
 			req.Context(), invitee, "", accountDB, device, gomatrixserverlib.Invite,
@@ -389,6 +386,10 @@ func createRoom(
 		var strippedState []gomatrixserverlib.InviteV2StrippedState
 		for _, event := range candidates {
 			switch event.Type() {
+			case gomatrixserverlib.MRoomName:
+				fallthrough
+			case gomatrixserverlib.MRoomCanonicalAlias:
+				fallthrough
 			case "m.room.encryption": // TODO: move this to gmsl
 				fallthrough
 			case gomatrixserverlib.MRoomMember:

clientapi/routing/membership.go

@@ -26,7 +26,6 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	"github.com/matrix-org/dendrite/clientapi/threepid"
 	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
-	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
 	"github.com/matrix-org/dendrite/internal/config"
 	"github.com/matrix-org/dendrite/internal/eventutil"
 	"github.com/matrix-org/dendrite/roomserver/api"
@@ -173,7 +172,6 @@ func SendInvite(
 	req *http.Request, accountDB accounts.Database, device *userapi.Device,
 	roomID string, cfg *config.ClientAPI,
 	rsAPI roomserverAPI.RoomserverInternalAPI, asAPI appserviceAPI.AppServiceQueryAPI,
-	fsAPI federationSenderAPI.FederationSenderInternalAPI,
 ) util.JSONResponse {
 	body, evTime, _, reqErr := extractRequestData(req, roomID, rsAPI)
 	if reqErr != nil {

clientapi/routing/routing.go

@@ -142,7 +142,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SendInvite(req, accountDB, device, vars["roomID"], cfg, rsAPI, asAPI, federationSender)
+			return SendInvite(req, accountDB, device, vars["roomID"], cfg, rsAPI, asAPI)
 		}),
 	).Methods(http.MethodPost, http.MethodOptions)
 	r0mux.Handle("/rooms/{roomID}/kick",

federationapi/routing/invite.go

@@ -144,7 +144,7 @@ func processInvite(
 
 	// Add the invite event to the roomserver.
 	if err := api.SendInvite(
-		ctx, rsAPI, signedEvent.Headered(roomVer), strippedState, event.Origin(), nil,
+		ctx, rsAPI, signedEvent.Headered(roomVer), strippedState, api.DoNotSendToOtherServers, nil,
 	); err != nil {
 		util.GetLogger(ctx).WithError(err).Error("producer.SendInvite failed")
 		return jsonerror.InternalServerError()

roomserver/api/wrapper.go

@@ -16,6 +16,7 @@ package api
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
@@ -100,6 +101,8 @@ func SendInvite(
 	inviteRoomState []gomatrixserverlib.InviteV2StrippedState,
 	sendAsServer gomatrixserverlib.ServerName, txnID *TransactionID,
 ) error {
+	// Start by sending the invite request into the roomserver. This will
+	// trigger the federation request amongst other things if needed.
 	request := &PerformInviteRequest{
 		Event:           inviteEvent,
 		InviteRoomState: inviteRoomState,
@@ -108,7 +111,28 @@ func SendInvite(
 		TransactionID:   txnID,
 	}
 	response := &PerformInviteResponse{}
-	return rsAPI.PerformInvite(ctx, request, response)
+	if err := rsAPI.PerformInvite(ctx, request, response); err != nil {
+		return fmt.Errorf("rsAPI.PerformInvite: %w", err)
+	}
+
+	// Now send the invite event into the roomserver. If the room is known
+	// locally then this will succeed, notifying existing users in the room
+	// about the new invite. If the room isn't known locally then this will
+	// fail - and that's also OK.
+	inputReq := &InputRoomEventsRequest{
+		InputRoomEvents: []InputRoomEvent{
+			{
+				Kind:         KindNew,
+				Event:        inviteEvent,
+				AuthEventIDs: inviteEvent.AuthEventIDs(),
+				SendAsServer: DoNotSendToOtherServers,
+			},
+		},
+	}
+	inputRes := &InputRoomEventsResponse{}
+	_ = rsAPI.InputRoomEvents(ctx, inputReq, inputRes)
+
+	return nil
 }
 
 // GetEvent returns the event or nil, even on errors.

roomserver/internal/perform_invite.go

@@ -36,26 +36,26 @@ func (r *RoomserverInternalAPI) PerformInvite(
 	}).Info("processing invite event")
 
 	_, domain, _ := gomatrixserverlib.SplitID('@', targetUserID)
-	isTargetLocalUser := domain == r.Cfg.Matrix.ServerName
+	isTargetLocal := domain == r.Cfg.Matrix.ServerName
-	isOriginLocalUser := event.Origin() == r.Cfg.Matrix.ServerName
+	isOriginLocal := event.Origin() == r.Cfg.Matrix.ServerName
 
-	// If the invite originated from us and the target isn't local then we
+	inviteState := req.InviteRoomState
-	// should try and send the invite over federation first. It might be
+	if len(inviteState) == 0 {
-	// that the remote user doesn't exist, in which case we can give up
+		if is, err := buildInviteStrippedState(ctx, r.DB, req); err == nil {
-	// processing here.
+			inviteState = is
-	if isOriginLocalUser && !isTargetLocalUser {
-		fsReq := &federationSenderAPI.PerformInviteRequest{
-			RoomVersion: req.RoomVersion,
-			Event:       req.Event,
 		}
-		fsRes := &federationSenderAPI.PerformInviteResponse{}
-		if err := r.fsAPI.PerformInvite(ctx, fsReq, fsRes); err != nil {
-			return fmt.Errorf("r.fsAPI.PerformInvite: %w", err)
 	}
-		event = fsRes.SignedEvent
+	if len(inviteState) == 0 {
+		if err := event.SetUnsignedField("invite_room_state", struct{}{}); err != nil {
+			return err
+		}
+	} else {
+		if err := event.SetUnsignedField("invite_room_state", inviteState); err != nil {
+			return err
+		}
 	}
 
-	updater, err := r.DB.MembershipUpdater(ctx, roomID, targetUserID, isTargetLocalUser, req.RoomVersion)
+	updater, err := r.DB.MembershipUpdater(ctx, roomID, targetUserID, isTargetLocal, req.RoomVersion)
 	if err != nil {
 		return err
 	}
@@ -101,9 +101,9 @@ func (r *RoomserverInternalAPI) PerformInvite(
 		}
 	}
 
+	if isOriginLocal {
 		// check that the user is allowed to do this. We can only do this check if it is
 		// a local invite as we have the auth events, else we have to take it on trust.
-	if isOriginLocalUser {
 		_, err = checkAuthEvents(ctx, r.DB, req.Event, req.Event.AuthEventIDs())
 		if err != nil {
 			log.WithError(err).WithField("event_id", event.EventID()).WithField("auth_event_ids", event.AuthEventIDs()).Error(
@@ -117,50 +117,22 @@ func (r *RoomserverInternalAPI) PerformInvite(
 			}
 			return err
 		}
-	}
 
-	if len(req.InviteRoomState) > 0 {
+		// If the invite originated from us and the target isn't local then we
-		// If we were supplied with some invite room state already (which is
+		// should try and send the invite over federation first. It might be
-		// most likely to be if the event came in over federation) then use
+		// that the remote user doesn't exist, in which case we can give up
-		// that.
+		// processing here.
-		if err = event.SetUnsignedField("invite_room_state", req.InviteRoomState); err != nil {
+		if req.SendAsServer != api.DoNotSendToOtherServers && !isTargetLocal {
-			return err
+			fsReq := &federationSenderAPI.PerformInviteRequest{
+				RoomVersion:     req.RoomVersion,
+				Event:           req.Event,
+				InviteRoomState: inviteState,
 			}
-	} else {
+			fsRes := &federationSenderAPI.PerformInviteResponse{}
-		// There's no invite room state, so let's have a go at building it
+			if err = r.fsAPI.PerformInvite(ctx, fsReq, fsRes); err != nil {
-		// up from local data (which is most likely to be if the event came
+				return fmt.Errorf("r.fsAPI.PerformInvite: %w", err)
-		// from the CS API). If we know about the room then we can insert
-		// the invite room state, if we don't then we just fail quietly.
-		if irs, ierr := buildInviteStrippedState(ctx, r.DB, req); ierr == nil {
-			if err = event.SetUnsignedField("invite_room_state", irs); err != nil {
-				return err
 			}
-		} else {
+			event = fsRes.SignedEvent
-			log.WithError(ierr).Warn("failed to build invite stripped state")
-			// still set the field else synapse deployments don't process the invite
-			if err = event.SetUnsignedField("invite_room_state", struct{}{}); err != nil {
-				return err
-			}
-		}
-	}
-
-	// If we're the sender of the event then we should send the invite
-	// event into the room so that the room state is updated and other
-	// room participants will see the invite.
-	if isOriginLocalUser {
-		inputReq := &api.InputRoomEventsRequest{
-			InputRoomEvents: []api.InputRoomEvent{
-				{
-					Kind:         api.KindNew,
-					Event:        event,
-					AuthEventIDs: event.AuthEventIDs(),
-					SendAsServer: api.DoNotSendToOtherServers,
-				},
-			},
-		}
-		inputRes := &api.InputRoomEventsResponse{}
-		if err = r.InputRoomEvents(ctx, inputReq, inputRes); err != nil {
-			return fmt.Errorf("r.InputRoomEvents: %w", err)
 		}
 	}
 
@@ -193,7 +165,7 @@ func buildInviteStrippedState(
 	for _, t := range []string{
 		gomatrixserverlib.MRoomName, gomatrixserverlib.MRoomCanonicalAlias,
 		gomatrixserverlib.MRoomAliases, gomatrixserverlib.MRoomJoinRules,
-		"m.room.avatar",
+		"m.room.avatar", "m.room.encryption",
 	} {
 		stateWanted = append(stateWanted, gomatrixserverlib.StateKeyTuple{
 			EventType: t,