问如何在rshiny获取窗口用户名

EN

library(shiny)
library(shinydashboard)

ui <- dashboardPage(
  dashboardHeader(title="Test"),
  dashboardSidebar(
    sidebarMenu(
      menuItem("Dashboard", tabName = "dashboard", icon = icon("dashboard")),
      menuItem("Widgets", tabName = "widgets", icon = icon("th"))
    )
  ),
  dashboardBody(
    
    tabItems(
      tabItem(tabName="dashboard",
              fluidRow(
                box(plotOutput("plot1",height=250)),
                box(
                  title="Contorls",
                  sliderInput("slider","Number of ovservations",1,100,50)
                  )
                )
              ),
      tabItem(tabName="widgets",
              h2("Widgets tab Content")
              )
      )
    )
)
server <- function(input,output,session){
  set.seed(122)
  histdata <- rnorm(500)
  
  ip <- session$request$REMOTE_ADDR
  cat("ip:",ip,"time : ",as.character(Sys.time()),"user :", as.character(Sys.getenv("USERNAME")),"\n")
  
  output$plot1 <- renderPlot({
    data <- histdata[seq_len(input$slider)]
    hist(data)
  })
}
shinyApp(ui,server)

require(shiny)

folder_address="C:/shinydashboard_test.R"
x <- system("ipconfig",intern=TRUE)
z <- x[grep("IPv4",x)]
ip <- gsub(".*?([[:digit:]])","\\1",z)
print(paste0("the Shiny Web application runs on: http://",ip,":8080/"))

runApp(folder_address,launch.browser = TRUE,port=8080,host=ip)