R Shiny: user authentication for a single app.R

Question

I am developing a R Shiny App and want to add user name and logins. I checked the RStudio demo but that is only using the ShinyServer Pro and I am using the mongolite packag

Answer 1

Well, you can do it via from code by using renderUI and changing the UI on the fly. Here is an example of how to do it:

library(shiny)
library(ggplot2)

u <- shinyUI(fluidPage(
  titlePanel("Shiny Password"),

  sidebarLayout(position = "left",
                sidebarPanel( h3("sidebar panel"),
                              uiOutput("in.pss"),
                              uiOutput("in.clr"),
                              uiOutput("in.titl"),
                              uiOutput("in.cnt"),
                              uiOutput("in.seed")

                ),
                mainPanel(h3("main panel"),
                          textOutput('echo'),
                          plotOutput('stdplot')
                )
  )
))

pok <- F

s <- shinyServer(function(input, output) 
{
  output$in.pss   <- renderUI({ input$pss; if (pok) return(NULL) else return(textInput("pss","Password:","")) })
  output$in.clr   <- renderUI({ input$pss; if (pok) return(selectInput("clr","Color:",c("red","blue"))) else return(NULL) })
  output$in.titl  <- renderUI({ input$pss; if (pok) return(textInput("titl","Title:","Data")) else return(NULL) })
  output$in.cnt   <- renderUI({ input$pss; if (pok) return(sliderInput("cnt","Count:",100,1000,500,5)) else return(NULL) })
  output$in.seed  <- renderUI({ input$pss; if (pok) return(numericInput("seed","Seed:",1234,1,10000,1)) else return(NULL) })
  histdata <- reactive(
    {
      input$pss;
      validate(need(input$cnt,"Need count"),need(input$seed,"Need seed"))
      set.seed(input$seed)
      df <- data.frame(x=rnorm(input$cnt))
    }
  )
  observe({
     if (!pok) {
       password <- input$pss
       if (!is.null(password) && password == "pass") {
         pok <<- TRUE
       }
     }
   }
  )
  output$echo = renderText(
    {
      if (pok) {
        s <- sprintf("the %s is %s and has %d rows and uses the %d seed",
           input$ent,input$clr,nrow(histdata()),input$seed)
      } else {
        s <- ""
      }
      return(s)
    }
  )
  output$stdplot = renderPlot(
    {
      input$pss
      if (pok) {
        return(qplot(data = histdata(),x,fill = I(input$clr),binwidth = 0.2,main=input$titl))
      } else {
        return(NULL)
      }
    }
  )
}
)
shinyApp(ui=u,server=s)

Yields

this at login:

And this once you have entered the hardcoded password "pass".

Of course programming this way is a bit awkward, but you could use tabs and hide them perhaps using a similar logic.

Or if you are using shinyServer you could probably put a filter in front of the site. But this is how I would approach it in Shiny.