---
title: "Login Test"
author: "Russell Almond"
date: "June 3, 2020"
output: html_document
runtime: shiny
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(EABN)
library(PNetica)
library(shiny)
library(futile.logger)
mess <- character()
flog.appender(function (line) {
  mess <<- c(mess,line)
  output$log <- renderTable(data.frame(Messages=mess),
                            colnames=FALSE)
})
flog.threshold(DEBUG)
```

## Login 

This page is mostly just to test the login and logging mechanisms.

```{r passwordChecker, echo=FALSE}

checkPassword <- function (uid,passwd) {
    pwdline <- system2("/bin/grep",
                       c(sprintf("^%s:",uid),                                   "/usr/local/share/Proc4/p4pwds"),
                       stdout=TRUE)
    if (!is.null(attr(pwdline,"status")) || 
        !is.character(pwdline) || length(pwdline) == 0L || 
        nchar(pwdline)==0L) 
      return (FALSE)
    pwdbits <- strsplit(pwdline,"$",fixed=TRUE)[[1]]
    method <- sprintf("-%s",pwdbits[2])
    salt <- pwdbits[3]
    pwd <- system2("/usr/bin/openssl",
                     c("passwd",method, 
                       "-salt",salt, input$adminpwd),
                     stdout=TRUE)
    target <- paste("$",paste(pwdbits[-1],collapse="$"),sep="")
    return (pwd == target)
}

```


```{r login, echo=FALSE}
tags$head(tags$script(src = "message-handler.js"))
inputPanel(
  textInput("adminid", label = "Username:",
              width = 500),
  passwordInput("adminpwd", label = "Password:",
              width = 500),
  textInput("branch", label = "Vesion Branch:",
            value="PP-main",width = 500),
  actionButton("go","Go")
)

p(tableOutput("log"))
observeEvent(input$go, {
  showNotification(
    ifelse(checkPassword(input$adminid,input$adminpwd),
           sprintf("Logged into application %s.", input$branch),
          "Authentication Error."))
  flog.info("Message 1.")
  flog.debug("Message 2.")
  flog.info("Message 3.")
  for (i in 4:25) {
    Sys.sleep(5)
    flog.info("Message %d",i)
  }
  })
```