[readability] use event.StateKeyEquals where relevant and minor for-loop refactoring (#1339)

* use event.StateKeyEquals where relevant

Signed-off-by: Olivier Charvin <git@olivier.pfad.fr>

* use userID

clientapi/routing/getevent.go

@@ -104,7 +104,9 @@ func GetEvent(
 	}
 
 	for _, stateEvent := range stateResp.StateEvents {
-		if stateEvent.StateKeyEquals(r.device.UserID) {
+		if !stateEvent.StateKeyEquals(device.UserID) {
+			continue
+		}
 		membership, err := stateEvent.Membership()
 		if err != nil {
 			util.GetLogger(req.Context()).WithError(err).Error("stateEvent.Membership failed")
@@ -117,7 +119,6 @@ func GetEvent(
 			}
 		}
 	}
-	}
 
 	return util.JSONResponse{
 		Code: http.StatusNotFound,

clientapi/routing/membership.go

@@ -388,15 +388,20 @@ func checkMemberInRoom(ctx context.Context, stateAPI currentstateAPI.CurrentStat
 		e := jsonerror.InternalServerError()
 		return &e
 	}
-	ev, ok := membershipRes.StateEvents[tuple]
-	if !ok {
+	ev := membershipRes.StateEvents[tuple]
+	if ev == nil {
 		return &util.JSONResponse{
 			Code: http.StatusForbidden,
 			JSON: jsonerror.Forbidden("user does not belong to room"),
 		}
 	}
 	membership, err := ev.Membership()
-	if err != nil || membership != "join" {
+	if err != nil {
+		util.GetLogger(ctx).WithError(err).Error("Member event isn't valid")
+		e := jsonerror.InternalServerError()
+		return &e
+	}
+	if membership != gomatrixserverlib.Join {
 		return &util.JSONResponse{
 			Code: http.StatusForbidden,
 			JSON: jsonerror.Forbidden("user does not belong to room"),

clientapi/routing/sendtyping.go

@@ -21,7 +21,6 @@ import (
 	"github.com/matrix-org/dendrite/eduserver/api"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
-	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 )
 
@@ -46,46 +45,19 @@ func SendTyping(
 	}
 
 	// Verify that the user is a member of this room
-	tuple := gomatrixserverlib.StateKeyTuple{
-		EventType: gomatrixserverlib.MRoomMember,
-		StateKey:  userID,
-	}
-	var res currentstateAPI.QueryCurrentStateResponse
-	err := stateAPI.QueryCurrentState(req.Context(), &currentstateAPI.QueryCurrentStateRequest{
-		RoomID:      roomID,
-		StateTuples: []gomatrixserverlib.StateKeyTuple{tuple},
-	}, &res)
-	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("QueryCurrentState failed")
-		return jsonerror.InternalServerError()
-	}
-	ev := res.StateEvents[tuple]
-	if ev == nil {
-		return util.JSONResponse{
-			Code: http.StatusForbidden,
-			JSON: jsonerror.Forbidden("User not in this room"),
-		}
-	}
-	membership, err := ev.Membership()
-	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("Member event isn't valid")
-		return jsonerror.InternalServerError()
-	}
-	if membership != gomatrixserverlib.Join {
-		return util.JSONResponse{
-			Code: http.StatusForbidden,
-			JSON: jsonerror.Forbidden("User not in this room"),
-		}
-	}
-
-	// parse the incoming http request
-	var r typingContentJSON
-	resErr := httputil.UnmarshalJSONRequest(req, &r)
+	resErr := checkMemberInRoom(req.Context(), stateAPI, userID, roomID)
 	if resErr != nil {
 		return *resErr
 	}
 
-	if err = api.SendTyping(
+	// parse the incoming http request
+	var r typingContentJSON
+	resErr = httputil.UnmarshalJSONRequest(req, &r)
+	if resErr != nil {
+		return *resErr
+	}
+
+	if err := api.SendTyping(
 		req.Context(), eduAPI, userID, roomID, r.Typing, r.Timeout,
 	); err != nil {
 		util.GetLogger(req.Context()).WithError(err).Error("eduProducer.Send failed")

currentstateserver/consumers/roomserver.go

@@ -126,10 +126,8 @@ func (c *OutputRoomEventConsumer) Start() error {
 }
 
 func (c *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.HeaderedEvent) (gomatrixserverlib.HeaderedEvent, error) {
-	var stateKey string
-	if event.StateKey() == nil {
-		stateKey = ""
-	} else {
+	stateKey := ""
+	if event.StateKey() != nil {
 		stateKey = *event.StateKey()
 	}
 

federationapi/routing/join.go

@@ -165,7 +165,7 @@ func SendJoin(
 	}
 
 	// Check that a state key is provided.
-	if event.StateKey() == nil || (event.StateKey() != nil && *event.StateKey() == "") {
+	if event.StateKey() == nil || event.StateKeyEquals("") {
 		return util.JSONResponse{
 			Code: http.StatusBadRequest,
 			JSON: jsonerror.BadJSON(
@@ -253,11 +253,12 @@ func SendJoin(
 	// there isn't much point in sending another join event into the room.
 	alreadyJoined := false
 	for _, se := range stateAndAuthChainResponse.StateEvents {
-		if membership, merr := se.Membership(); merr == nil {
-			if se.StateKey() != nil && *se.StateKey() == *event.StateKey() {
-				alreadyJoined = (membership == "join")
-				break
+		if !se.StateKeyEquals(*event.StateKey()) {
+			continue
 		}
+		if membership, merr := se.Membership(); merr == nil {
+			alreadyJoined = (membership == gomatrixserverlib.Join)
+			break
 		}
 	}
 

federationapi/routing/leave.go

@@ -81,7 +81,9 @@ func MakeLeave(
 	// event. This means that /send_leave will be a no-op, which helps
 	// to reject invites multiple times - hopefully.
 	for _, state := range queryRes.StateEvents {
-		if state.Type() == gomatrixserverlib.MRoomMember && state.StateKeyEquals(userID) {
+		if !state.StateKeyEquals(userID) {
+			continue
+		}
 		if mem, merr := state.Membership(); merr == nil && mem == gomatrixserverlib.Leave {
 			return util.JSONResponse{
 				Code: http.StatusOK,
@@ -92,7 +94,6 @@ func MakeLeave(
 			}
 		}
 	}
-	}
 
 	// Check that the leave is allowed or not
 	stateEvents := make([]*gomatrixserverlib.Event, len(queryRes.StateEvents))

roomserver/internal/perform_backfill.go

@@ -104,7 +104,7 @@ func (b *backfillRequester) calculateNewStateIDs(targetEvent, prevEvent gomatrix
 			continue
 		}
 		// The state IDs BEFORE the target event are the state IDs BEFORE the prev_event PLUS the prev_event itself
-		if ev.Type() == prevEvent.Type() && ev.StateKey() != nil && *ev.StateKey() == *prevEvent.StateKey() {
+		if ev.Type() == prevEvent.Type() && ev.StateKeyEquals(*prevEvent.StateKey()) {
 			newStateIDs[i] = prevEvent.EventID()
 			foundEvent = true
 			break

roomserver/internal/perform_join.go

@@ -204,13 +204,14 @@ func (r *RoomserverInternalAPI) performJoinRoomByID(
 		// a member of the room.
 		alreadyJoined := false
 		for _, se := range buildRes.StateEvents {
+			if !se.StateKeyEquals(userID) {
+				continue
+			}
 			if membership, merr := se.Membership(); merr == nil {
-				if se.StateKey() != nil && *se.StateKey() == *event.StateKey() {
 				alreadyJoined = (membership == gomatrixserverlib.Join)
 				break
 			}
 		}
-		}
 
 		// If we haven't already joined the room then send an event
 		// into the room changing our membership status.

syncapi/consumers/roomserver.go

@@ -169,9 +169,6 @@ func (s *OutputRoomEventConsumer) onNewRoomEvent(
 }
 
 func (s *OutputRoomEventConsumer) notifyKeyChanges(ev *gomatrixserverlib.HeaderedEvent) {
-	if ev.Type() != gomatrixserverlib.MRoomMember || ev.StateKey() == nil {
-		return
-	}
 	membership, err := ev.Membership()
 	if err != nil {
 		return

syncapi/storage/shared/syncserver.go

@@ -1216,14 +1216,14 @@ func removeDuplicates(stateEvents, recentEvents []gomatrixserverlib.HeaderedEven
 // getMembershipFromEvent returns the value of content.membership iff the event is a state event
 // with type 'm.room.member' and state_key of userID. Otherwise, an empty string is returned.
 func getMembershipFromEvent(ev *gomatrixserverlib.Event, userID string) string {
-	if ev.Type() == "m.room.member" && ev.StateKeyEquals(userID) {
+	if ev.Type() != "m.room.member" || !ev.StateKeyEquals(userID) {
+		return ""
+	}
 	membership, err := ev.Membership()
 	if err != nil {
 		return ""
 	}
 	return membership
-	}
-	return ""
 }
 
 type stateDelta struct {