enhancement: allow sending multiple userIDs in one SSE event

Author: fschade

changelog/unreleased/allow-multiple-event-user-ids.md

@@ -0,0 +1,5 @@
+Enhancement: allow sending multiple user ids in one sse event
+
+Sending multiple user ids in one sse event is now possible which reduces the number of sent events.
+
+https://github.com/cs3org/reva/pull/4501

pkg/events/sse.go

@@ -4,9 +4,9 @@ import (
 	"encoding/json"
 )
 
-// SendSEE instructs the sse service to send a notification to a user
+// SendSSE instructs the sse service to send one or multiple notifications
 type SendSSE struct {
-	UserID  string
+	UserIDs []string
 	Type    string
 	Message []byte
 }