Drop the event source if we are unauthorized (#15275)

A previous commit that sent unauthorized if the user is unauthorized
simply leads to the repeated reopening of the eventsource. #

This PR changes the event returned to tell the client to close the
eventsource and thus prevents the repeated reopening.

Signed-off-by: Andrew Thornton <art27@cantab.net>

routers/events/events.go

@@ -33,8 +33,8 @@ func Events(ctx *context.Context) {
 	if !ctx.IsSigned {
 		// Return unauthorized status event
 		event := (&eventsource.Event{
-			Name: "unauthorized",
-			Data: "sorry",
+			Name: "close",
+			Data: "unauthorized",
 		})
 		_, _ = event.WriteTo(ctx)
 		ctx.Resp.Flush()