Question

我下面有一个使用用户身份验证逻辑的闪亮应用程序。如您所见，首先使用以下内容创建数据框：

# dataframe that holds usernames, passwords and other user data
user_base <- data.frame(
  user = c("user1", "user2","user1"),
  password = c("pass1", "pass2","pass1"), 
  permissions = c("admin", "standard","admin"),
  name = c("User One", "User Two","User One"),
  stringsAsFactors = FALSE)

在此数据框中，用户使用user作为用户名，password作为密码，以便登录该应用程序。如您所见，我可以登录到该应用程序中，并且仅使用user2个凭据查看该表，因为user1存在于数据框的两行中。如果我跳过第三行，它将起作用。我的目标是根据我将使用的用户名和密码对原始数据帧user_base进行子集设置，但现在我可以看到，如果我有多个具有相同用户名的行，则该行不起作用。一个额外的问题是，是否可以跳过密码并允许用户仅使用用户名登录。

library(shiny)
library(shinyauthr)
library(shinyjs)

# dataframe that holds usernames, passwords and other user data
user_base <- data.frame(
  user = c("user1", "user2","user1"),
  password = c("pass1", "pass2","pass1"), 
  permissions = c("admin", "standard","admin"),
  name = c("User One", "User Two","User One"),
  stringsAsFactors = FALSE)

ui <- fluidPage(
  # must turn shinyjs on
  shinyjs::useShinyjs(),
  # add logout button UI 
  div(class = "pull-right", shinyauthr::logoutUI(id = "logout")),
  # add login panel UI function
  shinyauthr::loginUI(id = "login"),
  # setup table output to show user info after login
  tableOutput("user_table")
)

server <- function(input, output, session) {

  # call the logout module with reactive trigger to hide/show
  logout_init <- callModule(shinyauthr::logout, 
                            id = "logout", 
                            active = reactive(credentials()$user_auth))

  # call login module supplying data frame, user and password cols
  # and reactive trigger
  credentials <- callModule(shinyauthr::login, 
                            id = "login", 
                            data = user_base,
                            user_col = user,
                            pwd_col = password,
                            log_out = reactive(logout_init()))

  # pulls out the user information returned from login module
  user_data <- reactive({credentials()$info})

  output$user_table <- renderTable({
    # use req to only render results when credentials()$user_auth is TRUE
    req(credentials()$user_auth)
    user_data()
  })
}

shinyApp(ui = ui, server = server)

使用闪亮的用户身份验证方法对数据框进行分组

0 个答案: