In Apache, the LDAP login is passed to a variable called X-Remote-User in the header:
https://i.sstatic.net/7jyxO.jpg
I am unsure how to retrieve this information in my Shiny app. Does anyone have any ideas? Maybe using JavaScript could be a solution?
I have successfully resolved the issue. To begin, make sure to include the following code in the ui.R js function:
www/js/getLogin.js:
function requestLogin() {
var client = new XMLHttpRequest();
client.open("GET", "yourshinyhostname", true);
client.send();
client.onreadystatechange = function() {
var resposne = client.getResponseHeader("X-Remote-User");
Shiny.onInputChange("getLogin", resposne);
}; }
Next, retrieve the value of X-Remote-User, for example, by clicking a button:
ui.R:
includeScript("www/js/getLogin.js"),
uiOutput("login_btn"),
verbatimTextOutput("text")
server.R :
output$login_btn <- renderUI({
HREF <- sprintf('
<button id="get_login_btn" value="test" onclick="requestLogin();" >
<font color="black">
<i class="fa fa-user"></i> Get login
</font>
</button>
')
HTML(HREF)
})
jsOutput <- reactive({
input$getLogin
})
output$text <- renderPrint({
jsOutput()
})
Insert the javascript function call in server.R to retrieve the header without requiring a button click. Here is an example:
output$text <- renderPrint({
js$requestLogin()
jsOutput()
})
To access header variables, you can use the session$request method. Below is an interactive code snippet inspired by a sample on GitHub.
library(shiny)
server <- function(input, output, session) {
output$summary <- renderText({
ls(env=session$request)
})
output$headers <- renderUI({
selectInput("header", "Header:", ls(env=session$request))
})
output$value <- renderText({
if (nchar(input$header) < 1 || !exists(input$header, envir=session$request)){
return("NULL");
}
return (get(input$header, envir=session$request));
})
}
ui <- pageWithSidebar(
headerPanel("Shiny Client Data"),
sidebarPanel(
uiOutput("headers")
),
mainPanel(
h3("Headers passed into Shiny"),
verbatimTextOutput("summary"),
h3("Value of specified header"),
verbatimTextOutput("value")
)
)
shinyApp(ui, server)
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